version 3.5.93

* NEWS: Record release date.

.gitignore

@@ -1,7 +1,14 @@
+*.log
+*.o
+*.pdf
+*.stamp
+*.trs
+*~
+.deps
+.dirstamp
 /*.cache
 /*.flc
 /*.prj
-/*~
 /.tarball-version
 /.version
 /ABOUT-NLS

.prev-version

@@ -1 +1 @@
-2.6.3
+3.5.92

.travis.yml

@@ -0,0 +1,510 @@
+version: ~> 1.0
+
+# If the language is set to C or C++, Travis defines and exports CC
+# and CXX *after* we have defined our environment variables via 'env'.
+language: minimal
+
+# Run in two steps:
+# 1. Build the tarball
+#    On a modern distro, with all the needed dependencies, including the whole git history.
+# 2. Check it on various environments.
+#    Less dependencies, and little git content (we would like to have none, but it's not
+#    an option on Travis).
+stages:
+  - dist
+  - check
+
+# The 'check' jobs do not need the repo at all, only the 'dist'
+# does.  Let's save time, bandwith, energy, and polar bears.
+git:
+  clone: false
+
+# matrix.include and jobs.include are aliases
+# (https://docs.travis-ci.com/user/conditional-builds-stages-jobs/).
+jobs:
+  include:
+    - stage: dist
+      name: "Make dist"
+      git:
+        clone: true
+      dist: bionic
+      script:
+        - sudo apt-get install -qq autoconf automake autopoint flex gettext graphviz help2man m4 texinfo
+        - autoconf --version
+        - automake --version
+        - autopoint --version
+        - dot -V
+        - gettext --version
+        - help2man --version
+        - makeinfo --version
+        - m4 --version
+
+        # Travis makes a shallow clone, but we need it in full to build the ChangeLog and apply the fixes in git-log-fix.
+        - git fetch --unshallow || true
+        - git submodule update --init --recursive
+
+        - ./bootstrap
+        - ./configure --enable-gcc-warnings || { cat config.log && false; }
+        - make -j2
+        - make -j2 dist
+        # Can help understanding why we get "dirty" tarballs.
+        - git status
+        - dist=$(echo bison*.xz)
+
+        # Unfortunately we cannot deterministically know the name of the tarball without the full
+        # git history (because git describe --abbrev=4 may use more than 4 characters if there are
+        # conflicts).
+        #
+        # So for the sake of the 'check' jobs (that don't even have the repo at all), also expose this
+        # tarball on a name that only depends on the Travis build number.
+        #
+        # Without -b -, exit status is always 0.
+        #
+        # If we rerun a job that was already uploaded, 'ln -s' will fail: remove beforehand.
+        - sftp -b - [email protected] <<< "put $dist"$'\n'"-rm bison-$TRAVIS_BUILD_NUMBER.tar.xz"$'\n'"ln -s $dist bison-$TRAVIS_BUILD_NUMBER.tar.xz"
+
+    ## ------- ##
+    ## First.  ##
+    ## ------- ##
+
+    # Start with three completely different environments, to get errors asap.
+
+    - name: "GCC 9 -O3"
+      stage: check
+      os: linux
+      dist: bionic
+      addons: &gcc9
+        apt:
+          sources:
+            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
+            - sourceline: 'ppa:ubuntu-toolchain-r/test'
+          packages: g++-9
+      env:
+        - CC=gcc-9
+        - CXX=g++-9
+        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
+
+    # ASAN is time consuming, and we timeout the 50min granted by
+    # Travis if we run all the tests in one go.  Run in two parts.
+    - name: "Clang 9 libc++ and ASAN part 1"
+      stage: check
+      os: linux
+      dist: bionic
+      addons: &clang9
+        apt:
+          sources:
+            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
+            - sourceline: 'ppa:ubuntu-toolchain-r/test'
+            - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main'
+              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
+          packages:
+            - clang-9
+            - libc++-9-dev
+            - libc++abi-9-dev
+      env:
+        # Do not use ASAN with ubuntu's libc++: https://bugs.llvm.org/show_bug.cgi?id=17379
+        - CC='clang-9 -fsanitize=address'
+        - CXX='clang++-9 -fsanitize=address -stdlib=libc++'
+        - PART=1
+
+    - name: "Clang 9 libc++ and ASAN part 2"
+      stage: check
+      os: linux
+      dist: bionic
+      addons: *clang9
+      env:
+        # Do not use ASAN with ubuntu's libc++: https://bugs.llvm.org/show_bug.cgi?id=17379
+        - CC='clang-9 -fsanitize=address'
+        - CXX='clang++-9 -fsanitize=address -stdlib=libc++'
+        - PART=2
+
+    - name: "ICC"
+      stage: check
+      os: linux
+      compiler: icc
+      env:
+        - CC=icc
+        - CXX=icpc
+      install:
+        - source /opt/intel/inteloneapi/compiler/latest/env/vars.sh
+      addons:
+        apt:
+          sources:
+          - sourceline: 'deb https://apt.repos.intel.com/oneapi all main'
+            key_url: 'https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB'
+          packages:
+          - intel-oneapi-icc
+
+    ## ------- ##
+    ## First.  ##
+    ## ------- ##
+
+    # Start with three completely different environments, to get
+    # errors asap.
+
+    - name: "ARM64: GCC 9 -O3 part 1"
+      stage: check
+      os: linux
+      arch: arm64
+      dist: bionic
+      addons: *gcc9
+      env:
+        - CC=gcc-9
+        - CXX=g++-9
+        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
+        - PART=1
+
+    - name: "PPC64le: GCC 9 part 1"
+      stage: check
+      os: linux
+      arch: ppc64le
+      dist: bionic
+      addons: *gcc9
+      env:
+        - CC=gcc-9
+        - CXX=g++-9
+        - CONFIGUREFLAGS='CFLAGS=-O3 CXXFLAGS=-O3'
+        - PART=1
+
+    - name: "s390x: GCC 9 part 1"
+      stage: check
+      os: linux
+      arch: s390x
+      dist: bionic
+      addons: *gcc9
+      env:
+        - CC=gcc-9
+        - CXX=g++-9
+        - CONFIGUREFLAGS='CFLAGS=-O3 CXXFLAGS=-O3'
+        - PART=1
+
+    ## ----- ##
+    ## GCC.  ##
+    ## ----- ##
+
+    - name: "GCC 8 with sanitizers part 1"
+      os: linux
+      dist: bionic
+      addons:
+        apt:
+          packages: g++-8
+      env:
+        - CC='gcc-8 -fsanitize=undefined,address -fno-omit-frame-pointer'
+        - CXX='g++-8 -fsanitize=undefined,address -fno-omit-frame-pointer'
+        - CONFIGUREFLAGS='CFLAGS=-O1 CXXFLAGS=-O1'
+        - PART=1
+
+    - name: "GCC 8"
+      stage: check
+      os: linux
+      dist: bionic
+      addons:
+        apt:
+          packages: g++-8
+      env:
+        - CC=gcc-8
+        - CXX=g++-8
+
+    - name: "GCC 7"
+      stage: check
+      os: linux
+      dist: bionic
+      addons:
+        apt:
+          packages: g++-7
+      env:
+        - CC=gcc-7
+        - CXX=g++-7
+
+    - name: "GCC 6"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: ubuntu-toolchain-r-test
+          packages: g++-6
+      env:
+        - CC=gcc-6
+        - CXX=g++-6
+
+    - name: "GCC 5"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: ubuntu-toolchain-r-test
+          packages: g++-5
+      env:
+         - CC=gcc-5
+         - CXX=g++-5
+
+    - name: "GCC 4.9"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: ubuntu-toolchain-r-test
+          packages: g++-4.9
+      env:
+         - CC=gcc-4.9
+         - CXX=g++-4.9
+
+    - name: "GCC 4.8"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: ubuntu-toolchain-r-test
+          packages: g++-4.8
+      env:
+         - CC=gcc-4.8
+         - CXX=g++-4.8
+
+    - name: "GCC 4.7"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: ubuntu-toolchain-r-test
+          packages: g++-4.7
+      env:
+         - CC=gcc-4.7
+         - CXX=g++-4.7
+
+    - name: "GCC 4.6"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: ubuntu-toolchain-r-test
+          packages: g++-4.6
+      env:
+         - CC=gcc-4.6
+         - CXX=g++-4.6
+
+    ## ------- ##
+    ## Clang.  ##
+    ## ------- ##
+
+    - name: "Clang 8 -O3"
+      stage: check
+      os: linux
+      dist: bionic
+      addons:
+        apt:
+          packages:
+            - clang-8
+            - libc++-8-dev
+            - libc++abi-8-dev
+      env:
+        - CC=clang-8
+        - CXX='clang++-8 -stdlib=libc++'
+        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
+
+    - name: "Clang 7"
+      stage: check
+      os: linux
+      dist: bionic
+      addons:
+        apt:
+          packages:
+            - clang-7
+            - libc++-7-dev
+            - libc++abi-7-dev
+      env:
+        - CC=clang-7
+        - CXX='clang++-7 -stdlib=libc++'
+
+    - name: "Clang 6 and libc++"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-xenial-6.0
+            - ubuntu-toolchain-r-test
+          packages:
+            - clang-6.0
+            - libc++-dev
+      env:
+        - CC=clang-6.0
+        - CXX='clang++-6.0 -stdlib=libc++'
+
+    - name: "Clang 5"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: llvm-toolchain-xenial-5.0
+          packages:
+            - clang-5.0
+            - libc++-dev
+      env:
+        - CC='clang-5.0'
+        - CXX='clang++-5.0'
+
+    - name: "Clang 4"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: llvm-toolchain-xenial-4.0
+          packages: clang-4.0
+      env:
+        - CC=clang-4.0
+        - CXX=clang++-4.0
+
+    - name: "Clang 3.9"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources: llvm-toolchain-xenial-3.9
+          packages: clang-3.9
+      env:
+        - CC=clang-3.9
+        - CXX=clang++-3.9
+
+    - name: "Clang 3.8"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.8
+          packages: clang-3.8
+      env:
+        - CC=clang-3.8
+        - CXX=clang++-3.8
+
+    - name: "CLang 3.7"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.7
+          packages: clang-3.7
+      env:
+        - CC=clang-3.7
+        - CXX=clang++-3.7
+
+    - name: "Clang 3.6"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.6
+          packages: clang-3.6
+      env:
+        - CC=clang-3.6
+        - CXX=clang++-3.6
+
+    - name: "Clang 3.5"
+      stage: check
+      os: linux
+      dist: xenial
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.5
+          packages: clang-3.5
+      env:
+        - CC=clang-3.5
+        - CXX=clang++-3.5
+
+    - name: "Clang 3.4"
+      stage: check
+      os: linux
+      # Not available on Xenial.
+      dist: trusty
+      addons:
+        apt:
+          packages: clang-3.4
+      env:
+        # No versioned name installed, but beware that Travis installs
+        # a more modern clang earlier in the default PATH.
+        - CC=/usr/bin/clang
+        - CXX=/usr/bin/clang++
+
+    - name: "Clang 3.3"
+      stage: check
+      os: linux
+      # Not available on Xenial.
+      dist: trusty
+      addons:
+        apt:
+          packages: clang-3.3
+      env:
+        # See comment for 3.4.
+        - CC=/usr/bin/clang
+        - CXX=/usr/bin/clang++
+
+## From https://docs.gitlab.com/ce/ci/ssh_keys/#ssh-keys-when-using-the-docker-executor.
+## Applies to Travis too.  Applied to all the 'script's (of all the jobs).
+before_script:
+  - 'which ssh-agent || ( sudo apt-get install openssh-client -y )'
+  - eval "$(ssh-agent -s)"
+  # $SSH_PRIVATE_KEY is multiline.  Use $'...' to register its value: $'-----BEGIN OPENSSH PRIVATE KEY-----\nXXXXX...\n...==\n-----END OPENSSH PRIVATE KEY-----'.
+  - echo "$SSH_PRIVATE_KEY" >/tmp/key.id_rsa
+  - chmod 600 /tmp/key.id_rsa
+  - ssh-add /tmp/key.id_rsa </dev/null
+  - mkdir -p ~/.ssh
+  - chmod 700 ~/.ssh
+  - echo '|1|bpc51UGxoDZjCPiwRlCStW32trI=|rfh6mLoLZv/vAvOVrpZXI1hTLxg= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBIR+ckMoJTNXHvAQLHWSfrRnrNJGW2ZR6kr5pBVDGCkz1v1RcQ5rleq0NAt9kS3v4hgnuLiEVnK7KDRzcEH3ikc=' >>~/.ssh/known_hosts
+  - chmod 600 ~/.ssh/known_hosts
+
+# Applies only to the jobs that don't have a 'script', i.e., applies to all the 'check' jobs, but not the 'dist' one.
+script:
+  # Beware not too leak $SSH_PRIVATE_KEY.
+  # - env
+  - sudo apt-get install -qq doxygen flex m4
+  # Install and activate dmd.
+  - mkdir -p ~/dlang && wget https://dlang.org/install.sh -O ~/dlang/install.sh
+  - source $(source ~/dlang/install.sh dmd -a) || true
+
+  - $CC --version
+  - $CXX --version
+  - dmd --version || true
+  - doxygen --version
+  - flex --version
+  - ld --version
+  - m4 --version
+
+  - if [[ -f ~/.bashrc ]]; then source ~/.bashrc; fi
+  # Unset this variable, otherwise, Java programs' stderr is cluttered
+  # with `Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m`, which makes
+  # the test suite fail.
+  - unset _JAVA_OPTIONS
+
+  # Fail fast from now on.
+  - set -e
+  - sftp [email protected]:bison-$TRAVIS_BUILD_NUMBER.tar.xz
+  - tar xf bison-$TRAVIS_BUILD_NUMBER.tar.xz
+  - dir=$(tar tf bison-$TRAVIS_BUILD_NUMBER.tar.xz | sed 1q)
+  - cd $dir
+  - mkdir _build
+  - cd _build
+  - ../configure --enable-gcc-warnings CC="$CC" CXX="$CXX" $CONFIGUREFLAGS || { cat config.log && false; }
+  - make -j2 $MAKE_ARGS
+  - if test ${PART-1} = 1; then make check                  VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat test-suite.log && cat tests/testsuite.log && false; }; fi
+  - if test ${PART-2} = 2; then make maintainer-check-posix VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat tests/testsuite.log && false; }; fi
+  - if test ${PART-2} = 2; then make maintainer-check-g++   VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat tests/testsuite.log && false; }; fi

AUTHORS

@@ -24,7 +24,7 @@ and nasty bugs.
 
 -----
 
-Copyright (C) 1998-2012 Free Software Foundation, Inc.
+Copyright (C) 1998-2015, 2018-2020 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 

Makefile.am

@@ -1,7 +1,7 @@
-## Process this file with automake to produce Makefile.in -*-Makefile-*-
-
-## Copyright (C) 2001-2012 Free Software Foundation, Inc.
+## Process this file with automake to produce Makefile.in.
 
+# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+#
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
@@ -15,29 +15,66 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+AUTOMAKE_OPTIONS = subdir-objects
 ACLOCAL_AMFLAGS = -I m4
 
-SUBDIRS = build-aux po runtime-po lib data src doc examples tests etc
+SUBDIRS = po runtime-po gnulib-po .
 
 # Files installed for use by Automake.
 aclocaldir = @aclocaldir@
 aclocal_DATA = m4/bison-i18n.m4
 
-EXTRA_DIST = .prev-version .version \
-  cfg.mk ChangeLog-1998 ChangeLog-2012 PACKAGING \
-  djgpp/Makefile.maint djgpp/README.in djgpp/config.bat \
-  djgpp/config.sed djgpp/config.site djgpp/config_h.sed \
-  djgpp/subpipe.c djgpp/subpipe.h djgpp/djunpack.bat \
-  djgpp/fnchange.lst djgpp/testsuite.sed
+EXTRA_DIST = .prev-version .version cfg.mk PACKAGING \
+  ChangeLog-1998 ChangeLog-2012 ChangeLog
 
-MAINTAINER_CHECKS =				\
-  maintainer-check				\
-  maintainer-push-check				\
-  maintainer-xml-check				\
-  maintainer-release-check
-.PHONY: $(MAINTAINER_CHECKS)
-$(MAINTAINER_CHECKS):
-	$(AM_V_GEN)cd tests && $(MAKE) $(AM_MAKEFLAGS) $@
+dist_doc_DATA = AUTHORS COPYING NEWS README THANKS TODO
+
+# Let generated files (e.g., from examples/) depend on this variable,
+# to make sure they are regenerated when there are changes in Bison.
+#
+# Don't depend on $(BISON) otherwise we would rebuild these files
+# in srcdir, including during distcheck, which is forbidden.
+dependencies = $(BISON_IN) $(src_bison_SOURCES) $(dist_skeletons_DATA)
+
+## Running the bison from this tarball.  To generate our own parser,
+## but also to run the tests.  Of course, you ought to keep a sane
+## version of Bison nearby...
+BISON = $(top_builddir)/tests/bison
+BISON_IN = $(top_srcdir)/tests/bison.in
+YACC = $(BISON) -o y.tab.c
+AM_YFLAGS_WITH_LINES = --defines -Werror -Wall,dangling-alias --report=all
+AM_YFLAGS = $(AM_YFLAGS_WITH_LINES) --no-lines
+
+# Initialization before completion by local.mk's.
+AM_CFLAGS = $(WARN_CFLAGS)
+# Find builddir/src/scan-code.c etc.  For some reason "-I./lib"
+# instead of "-Ilib" avoids infinite recursions on #include_next.
+AM_CPPFLAGS = -I. -I./lib -I$(top_srcdir) -I$(top_srcdir)/lib
+BUILT_SOURCES =
+CLEANDIRS =
+CLEANFILES =
+DISTCLEANFILES =
+EXTRA_DIST += $(dist_TESTS)
+MOSTLYCLEANDIRS =
+MOSTLYCLEANFILES =
+SUFFIXES =
+TESTS = $(dist_TESTS)
+check_PROGRAMS =
+check_SCRIPTS =
+dist_TESTS =
+noinst_LIBRARIES =
+
+include build-aux/local.mk
+include data/local.mk
+include doc/local.mk
+include etc/local.mk
+include examples/local.mk
+include lib/local.mk
+include src/local.mk
+include tests/local.mk
+
+clean-local:
+	rm -rf $(CLEANDIRS)
 
 # See comments in build-aux/git-version-gen.  However, we make .version depend
 # on configure so that .version and VERSION/PACKAGE_VERSION stay in sync in the
@@ -48,20 +85,32 @@ $(MAINTAINER_CHECKS):
 # a developer might naively reference .version in a test case while the bison
 # executable still compiles with VERSION, and so the test case might fail or
 # pass incorrectly.
-BUILT_SOURCES = $(top_srcdir)/.version
+BUILT_SOURCES += $(top_srcdir)/.version
 $(top_srcdir)/.version: configure
-	$(AM_V_GEN)echo $(VERSION) > $@-t && mv $@-t $@
-dist-hook: gen-ChangeLog
-	$(AM_V_GEN)echo $(VERSION) > $(distdir)/.tarball-version
+	echo $(VERSION) > $@-t && mv $@-t $@
+dist-hook: gen-ChangeLog gen-synclines
+	echo $(VERSION) > $(distdir)/.tarball-version
+
+# When generating a release, include the #lines in Bison's parser.  Do it
+# only if needed.  In particular, distcheck runs dist with read-only
+# sources, so don't try to update src/parse-gram.c: we don't have the
+# permissions.
+.PHONY: gen-synclines
+gen-synclines:
+	cd $(distdir) &&						\
+	if ! grep '#line' src/parse-gram.c >/dev/null 2>&1; then	\
+	  $(abs_top_builddir)/tests/bison				\
+	    $(AM_YFLAGS_WITH_LINES) src/parse-gram.y			\
+	    -o src/parse-gram.c;					\
+	fi
 
 .PHONY: update-b4-copyright update-package-copyright-year
 update-b4-copyright:
-	$(AM_V_GEN) find data -type f		\
-	  | grep -v -E '^data/bison.m4$$'	\
-	  | xargs $(build_aux)/$@
+	$(AM_V_GEN)find $(srcdir)/data -type f          \
+	  | xargs $(srcdir)/build-aux/$@
 	@echo 'warning: src/parse-gram.[hc] may need to be regenerated.'
 update-package-copyright-year:
-	$(AM_V_GEN)$(build_aux)/$@ configure.ac
+	$(AM_V_GEN)$(srcdir)/build-aux/$@ $(srcdir)/configure.ac
 
 gen_start_date = 2012-01-16
 .PHONY: gen-ChangeLog

PACKAGING

@@ -36,7 +36,8 @@ to the bison package.
 
 -----
 
-Copyright (C) 2002, 2005, 2009-2012 Free Software Foundation, Inc.
+Copyright (C) 2002, 2005, 2009-2015, 2018-2020 Free Software Foundation,
+Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 

README

@@ -1,63 +1,125 @@
-This package contains the GNU Bison parser generator.
+GNU Bison is a general-purpose parser generator that converts an annotated
+context-free grammar into a deterministic LR or generalized LR (GLR) parser
+employing LALR(1) parser tables.  Bison can also generate IELR(1) or
+canonical LR(1) parser tables.  Once you are proficient with Bison, you can
+use it to develop a wide range of language parsers, from those used in
+simple desk calculators to complex programming languages.
 
-* Installation
-** Build
-See the file INSTALL for generic compilation and installation
-instructions.
+Bison is upward compatible with Yacc: all properly-written Yacc grammars
+work with Bison with no change.  Anyone familiar with Yacc should be able to
+use Bison with little trouble.  You need to be fluent in C, C++ or Java
+programming in order to use Bison.
 
-Bison requires GNU m4 1.4.6 or later.  See:
+Bison and the parsers it generates are portable, they do not require any
+specific compilers.
 
-      ftp://ftp.gnu.org/gnu/m4/m4-1.4.6.tar.gz
+GNU Bison's home page is https://gnu.org/software/bison/.
 
-** Internationalization
-Bison supports two catalogues: one for Bison itself (i.e., for the
-maintainer-side parser generation), and one for the generated parsers
-(i.e., for the user-side parser execution).  The requirements between
-both differ: bison needs ngettext, the generated parsers do not.  To
-simplify the build system, neither are installed if ngettext is not
-supported, even if generated parsers could have been localized.  See
-http://lists.gnu.org/archive/html/bug-bison/2009-08/msg00006.html for
-more details.
+# Installation
+## Build from git
+Here are basic installation instructions for a repository checkout:
 
-* Questions
-See the section FAQ in the documentation (doc/bison.info) for
-frequently asked questions.  The documentation is also available in
-PDF and HTML, provided you have a recent version of Texinfo installed:
-run "make pdf" or "make html".
+    $ git submodule update --init
+    $ ./bootstrap
 
-If you have questions about using Bison and the documentation does
-not answer them, please send mail to <[email protected]>.
+then proceed with the usual `configure && make` steps.
 
-* Bug reports
-Please send bug reports to <[email protected]>.  Please include the
-version number from `bison --version', and a complete, self-contained
-test case in each bug report.
+The file README-hacking.md is about building, modifying and checking Bison.
 
-* Copyright statements
-For any copyright year range specified as YYYY-ZZZZ in this package,
-note that the range specifies every single year in that closed interval.
+## Build from tarball
+See the file INSTALL for generic compilation and installation instructions.
 
+Bison requires GNU m4 1.4.6 or later.  See
+https://ftp.gnu.org/gnu/m4/m4-1.4.6.tar.gz.
+
+## Running a non installed bison
+Once you ran `make`, you might want to toy with this fresh bison before
+installing it.  In that case, do not use `src/bison`: it would use the
+*installed* files (skeletons, etc.), not the local ones.  Use `tests/bison`.
+
+## Colored diagnostics
+As an experimental feature, diagnostics are now colored, controlled by the
+`--color` and `--style` options.
+
+To use them, install the libtextstyle library before configuring Bison.  It
+is available from https://alpha.gnu.org/gnu/gettext/, for instance
+https://alpha.gnu.org/pub/gnu/gettext/libtextstyle-0.20.5.tar.gz.
+
+The option --color supports the following arguments:
+- always, yes: Enable colors.
+- never, no: Disable colors.
+- auto, tty (default): Enable colors if the output device is a tty.
+
+To customize the styles, create a CSS file, say `bison-bw.css`, similar to
+
+    /* bison-bw.css */
+    .warning   { }
+    .error     { font-weight: 800; text-decoration: underline; }
+    .note      { }
+
+then invoke bison with `--style=bison-bw.css`, or set the `BISON_STYLE`
+environment variable to `bison-bw.css`.
+
+## Relocatability
+If you pass `--enable-relocatable` to `configure`, Bison is relocatable.
+
+A relocatable program can be moved or copied to a different location on the
+file system.  It can also be used through mount points for network sharing.
+It is possible to make symlinks to the installed and moved programs, and
+invoke them through the symlink.
+
+See "Enabling Relocatability" in the documentation.
+
+## Internationalization
+Bison supports two catalogs: one for Bison itself (i.e., for the
+maintainer-side parser generation), and one for the generated parsers (i.e.,
+for the user-side parser execution).  The requirements between both differ:
+bison needs ngettext, the generated parsers do not.  To simplify the build
+system, neither are installed if ngettext is not supported, even if
+generated parsers could have been localized.  See
+http://lists.gnu.org/archive/html/bug-bison/2009-08/msg00006.html for more
+details.
+
+# Questions
+See the section FAQ in the documentation (doc/bison.info) for frequently
+asked questions.  The documentation is also available in PDF and HTML,
+provided you have a recent version of Texinfo installed: run `make pdf` or
+`make html`.
+
+If you have questions about using Bison and the documentation does not
+answer them, please send mail to <[email protected]>.
+
+# Bug reports
+Please send bug reports to <[email protected]>.  Be sure to include the
+version number from `bison --version`, and a complete, self-contained test
+case in each bug report.
+
+# Copyright statements
+For any copyright year range specified as YYYY-ZZZZ in this package, note
+that the range specifies every single year in that closed interval.
+
+<!--
+
+Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2020 Free
+Software Foundation, Inc.
+
+This file is part of GNU bison, the GNU Compiler Compiler.
+
+Permission is granted to copy, distribute and/or modify this document
+under the terms of the GNU Free Documentation License, Version 1.3 or
+any later version published by the Free Software Foundation; with no
+Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
+Texts.  A copy of the license is included in the "GNU Free
+Documentation License" file as part of this distribution.
 
 Local Variables:
-mode: outline
+mode: markdown
+fill-column: 76
+ispell-dictionary: "american"
 End:
 
------
+LocalWords:  parsers ngettext Texinfo pdf html YYYY ZZZZ ispell american md
+LocalWords:  MERCHANTABILITY GLR LALR IELR submodule init README src bw
+LocalWords:  Relocatability symlinks symlink
 
-Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2012 Free Software
-Foundation, Inc.
-
-This file is part of Bison, the GNU Compiler Compiler.
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
+-->

README-alpha

@@ -12,7 +12,8 @@ the problems you encounter.
 
 -----
 
-Copyright (C) 2002, 2004, 2009-2012 Free Software Foundation, Inc.
+Copyright (C) 2002, 2004, 2009-2015, 2018-2020 Free Software Foundation,
+Inc.
 
 This file is part of GNU Bison.
 

README-hacking

@@ -1,436 +0,0 @@
-This file attempts to describe the rules to use when hacking Bison.
-Don't put this file into the distribution.
-
-Everything related to the development of Bison is on Savannah:
-
-        http://savannah.gnu.org/projects/bison/
-
-
-* Administrivia
-
-** If you incorporate a change from somebody on the net:
-First, if it is a large change, you must make sure they have signed
-the appropriate paperwork.  Second, be sure to add their name and
-email address to THANKS.
-
-** If a change fixes a test, mention the test in the commit message.
-
-** Bug reports
-If somebody reports a new bug, mention his name in the commit message
-and in the test case you write.  Put him into THANKS.
-
-The correct response to most actual bugs is to write a new test case
-which demonstrates the bug.  Then fix the bug, re-run the test suite,
-and check everything in.
-
-
-* Hacking
-
-** Visible changes
-Which include serious bug fixes, must be mentioned in NEWS.
-
-** Translations
-Only user visible strings are to be translated: error messages, bits
-of the .output file etc.  This excludes impossible error messages
-(comparable to assert/abort), and all the --trace output which is
-meant for the maintainers only.
-
-
-* Working from the repository
-
-These notes intend to help people working on the checked-out sources.
-These requirements do not apply when building from a distribution tarball.
-
-** Requirements
-
-We've opted to keep only the highest-level sources in the repository.
-This eases our maintenance burden, (fewer merges etc.), but imposes more
-requirements on anyone wishing to build from the just-checked-out sources.
-For example, you have to use the latest stable versions of the maintainer
-tools we depend upon, including:
-
-- Automake <http://www.gnu.org/software/automake/>
-- Autoconf <http://www.gnu.org/software/autoconf/>
-- Flex <http://www.gnu.org/software/flex/>
-- Gettext <http://www.gnu.org/software/gettext/>
-- Gzip <http://www.gnu.org/software/gzip/>
-- Perl <http://www.cpan.org/>
-- Rsync <http://samba.anu.edu.au/rsync/>
-- Tar <http://www.gnu.org/software/tar/>
-
-Valgrind <http://valgrind.org/> is also highly recommended, if it supports
-your architecture.
-
-Bison is written using Bison grammars, so there are bootstrapping
-issues.  The bootstrap script attempts to discover when the C code
-generated from the grammars is out of date, and to bootstrap with an
-out-of-date version of the C code, but the process is not foolproof.
-Also, you may run into similar problems yourself if you modify Bison.
-
-Only building the initial full source tree will be a bit painful.
-Later, after synchronizing from the repository a plain 'make' should
-be sufficient.  Note, however, that when gnulib is updated, running
-'./bootstrap' again might be needed.
-
-** First checkout
-
-Obviously, if you are reading these notes, you did manage to check out
-this package from the repository.  For the record, you will find all the
-relevant information on:
-
-        http://savannah.gnu.org/git/?group=bison
-
-Bison uses Git submodules: subscriptions to other Git repositories.
-In particular it uses gnulib, the GNU portability library.  To ask Git
-to perform the first checkout of the submodules, run
-
-       $ git submodule update --init
-
-Git submodule support is weak before versions 1.6 and later, you
-should probably upgrade Git if your version is older.
-
-The next step is to get other files needed to build, which are
-extracted from other source packages:
-
-        $ ./bootstrap
-
-And there you are!  Just
-
-        $ ./configure
-        $ make
-        $ make check
-
-At this point, there should be no difference between your local copy,
-and the master copy:
-
-        $ git diff
-
-should output no difference.
-
-Enjoy!
-
-** Updating
-
-The use of submodules make things somewhat different because git does
-not support recursive operations: submodules must be taken care of
-explicitly by the user.
-
-*** Updating Bison
-
-If you pull a newer version of a branch, say via "git pull", you might
-import requests for updated submodules.  A simple "git diff" will
-reveal if the current version of the submodule (i.e., the actual
-contents of the gnulib directory) and the current request from the
-subscriber (i.e., the reference of the version of gnulib that the
-Bison repository requests) differ.  To upgrade the submodules (i.e.,
-to check out the version that is actually requested by the subscriber,
-run "git submodule update".
-
-        $ git pull
-        $ git submodule update
-
-*** Updating a submodule
-To update a submodule, say gnulib, do as follows:
-
-Get the most recent version of the master branch from git.
-
-        $ cd gnulib
-        $ git fetch
-        $ git checkout -b master --track origin/master
-
-Make sure Bison can live with that version of gnulib.
-
-        $ cd ..
-        $ ./bootstrap
-        $ make distcheck
-
-Register your changes.
-
-        $ git checkin ...
-
-For a suggestion of what gnulib commit might be stable enough for a
-formal release, see the ChangeLog in the latest gnulib snapshot at:
-
-        http://erislabs.net/ianb/projects/gnulib/
-
-The Autoconf files we use are currently:
-
-        m4/m4.m4
-        lib/m4sugar/m4sugar.m4
-        lib/m4sugar/foreach.m4
-
-These files don't change very often in Autoconf, so it should be
-relatively straight-forward to examine the differences in order to
-decide whether to update.
-
-* Test suite
-
-** make check
-Use liberally.
-
-** Typical errors
-If the test suite shows failures such as the following one
-
-  .../bison/lib/getopt.h:196:8: error: redefinition of 'struct option'
-  /usr/include/getopt.h:54:8: error: previous definition of 'struct option'
-
-it probably means that some file was compiled without
-AT_DATA_SOURCE_PROLOGUE.  This error is due to the fact that our -I options
-pick up gnulib's replacement headers, such as getopt.h, and this will go
-wrong if config.h was not included first.
-
-See tests/local.at for details.
-
-** make maintainer-check-valgrind
-This target uses valgrind both to check bison, and the generated parsers.
-
-This is not mature on Mac OS X.  First, Valgrind does support the way bison
-calls m4, so Valgrind cannot be used to check bison on Mac OS X.
-
-Second, there are many errors that come from the platform itself, not from
-bison.  build-aux/darwin11.4.0.valgrind addresses some of them.
-
-Third, valgrind issues warnings such as:
-
-  --99312:0:syswrap- WARNING: Ignoring sigreturn( ..., UC_RESET_ALT_STACK );
-
-which cause the test to fail uselessly.  It is hard to ignore these errors
-with a major overhaul of the way instrumentation is performed in the test
-suite.  So currently, do not try to run valgrind on Mac OS X.
-
-** Release checks
-Try to run the test suite with more severe conditions before a
-release:
-
-- Configure the package with --enable-gcc-warnings, so that one checks
-  that 1. Bison compiles cleanly, 2. the parsers it produces compile
-  cleanly too.
-
-- Maybe build with -DGNULIB_POSIXCHECK, which suggests gnulib modules
-  that can fix portability issues.  See if you really want to pay
-  attention to its warnings; there's no need to obey blindly to it
-  (<http://lists.gnu.org/archive/html/bison-patches/2012-05/msg00057.html>).
-
-- Check with "make syntax-check" if there are issues diagnosed by
-  gnulib.
-
-- run "make maintainer-check" which:
-  - runs "valgrind -q bison" to run Bison under Valgrind.
-  - runs the parsers under Valgrind.
-  - runs the test suite with G++ as C compiler...
-
-- run "make maintainer-push-check", which runs "make maintainer-check"
-  while activating the push implementation and its pull interface wrappers
-  in many test cases that were originally written to exercise only the
-  pull implementation.  This makes certain the push implementation can
-  perform every task the pull implementation can.
-
-- run "make maintainer-xml-check", which runs "make maintainer-check"
-  while checking Bison's XML automaton report for every working grammar
-  passed to Bison in the test suite.  The check just diffs the output of
-  Bison's included XSLT style sheets with the output of --report=all and
-  --graph.
-
-- running "make maintainer-release-check" takes care of running
-  maintainer-check, maintainer-push-check and maintainer-xml-check.
-
-- Change tests/atlocal/CFLAGS to add your preferred options.  For
-  instance, "-traditional" to check that the parsers are K&R.  Note
-  that it does not make sense for glr.c, which should be ANSI, but
-  currently is actually GNU C, nor for lalr1.cc.
-
-
-* Release Procedure
-This section needs to be updated to take into account features from
-gnulib.  In particular, be sure to read README-release.
-
-** Update the submodules.  See above.
-
-** Update maintainer tools, such as Autoconf.  See above.
-
-** Try to get the *.pot files to the Translation Project at least one
-week before a stable release, to give them time to translate them.
-Before generating the *.pot files, make sure that po/POTFILES.in and
-runtime-po/POTFILES.in list all files with translatable strings.
-This helps: grep -l '\<_(' *
-
-** Tests
-See above.
-
-** Update the foreign files
-Running "./bootstrap" in the top level should update them all for you.
-This covers PO files too.  Sometimes a PO file contains problems that
-causes it to be rejected by recent Gettext releases; please report
-these to the Translation Project.
-
-** Update README
-Make sure the information in README is current.  Most notably, make sure
-it recommends a version of GNU M4 that is compatible with the latest
-Bison sources.
-
-** Check copyright years.
-We update years in copyright statements throughout Bison once at the
-start of every year by running "make update-copyright".  However, before
-a release, it's good to verify that it's actually been run.  Besides the
-copyright statement for each Bison file, check the copyright statements
-that the skeletons insert into generated parsers, and check all
-occurrences of PACKAGE_COPYRIGHT_YEAR in configure.ac.
-
-** Update NEWS, commit and tag.
-See do-release-commit-and-tag in README-release.  For a while, we used
-beta names such as "2.6_rc1".  Now that we use gnulib in the release
-procedure, we must use "2.5.90", which has the additional benefit of
-being properly sorted in "git tag -l".
-
-** make alpha, beta, or stable
-See README-release.
-
-** Upload
-There are two ways to upload the tarballs to the GNU servers: using
-gnupload (from gnulib), or by hand.  Obviously prefer the former.  But
-in either case, be sure to read the following paragraph.
-
-*** Setup
-You need "gnupg".
-
-Make sure your public key has been uploaded at least to
-keys.gnupg.net.  You can upload it with:
-
-  gpg --keyserver keys.gnupg.net --send-keys F125BDF3
-
-where F125BDF3 should be replaced with your key ID.
-
-*** Using gnupload
-You need "ncftp".
-
-At the end "make stable" (or alpha/beta) will display the procedure to
-run.  Just copy and paste it in your shell.
-
-*** By hand
-
-The generic GNU upload procedure is at:
-
-  http://www.gnu.org/prep/maintain/maintain.html#Automated-FTP-Uploads
-
-Follow the instructions there to register your information so you're permitted
-to upload.
-
-Here's a brief reminder of how to roll the tarballs and upload them:
-
-*** make distcheck
-*** gpg -b bison-2.3b.tar.gz
-*** In a file named "bison-2.3b.tar.gz.directive", type:
-
-      version: 1.1
-      directory: bison
-      filename: bison-2.3b.tar.gz
-
-*** gpg --clearsign bison-2.3b.tar.gz.directive
-*** ftp ftp-upload.gnu.org # Log in as anonymous.
-*** cd /incoming/alpha # cd /incoming/ftp for full release.
-*** put bison-2.3b.tar.gz # This can take a while.
-*** put bison-2.3b.tar.gz.sig
-*** put bison-2.3b.tar.gz.directive.asc
-*** Repeat all these steps for bison-2.3b.tar.xz.
-
-** Update Bison manual on www.gnu.org.
-
-*** You need a non-anonymous checkout of the web pages directory.
-
-  $ cvs -d [email protected]:/web/bison checkout bison
-
-*** Get familiar with the instructions for web page maintainers.
-http://www.gnu.org/server/standards/readme_index.html
-http://www.gnu.org/server/standards/README.software.html
-especially the note about symlinks.
-
-*** Build the web pages.
-Assuming BISON_CHECKOUT refers to a checkout of the Bison dir, and
-BISON_WWW_CHECKOUT refers to the web directory created above, do:
-
-  $ cd $BISON_CHECKOUT/doc
-  $ make stamp-vti
-  $ ../build-aux/gendocs.sh -o "$BISON_WWW_CHECKOUT/manual" \
-    bison "Bison - GNU parser generator"
-  $ cd $BISON_WWW_CHECKOUT
-
-Verify that the result looks sane.
-
-*** Commit the modified and the new files.
-
-*** Remove old files.
-Find the files which have not been overwritten (because they belonged to
-sections that have been removed or renamed):
-
-   $ cd manual/html_node
-   $ ls -lt
-
-Remove these files and commit their removal to CVS.  For each of these
-files, add a line to the file .symlinks.  This will ensure that
-hyperlinks to the removed files will redirect to the entire manual; this
-is better than a 404 error.
-
-There is a problem with 'index.html' being written twice (once for POSIX
-function 'index', once for the table of contents); you can ignore this
-issue.
-
-** Announce
-The "make stable" (or alpha/beta) command just created a template,
-$HOME/announce-bison-X.Y.  Otherwise, to generate it, run:
-
-  make RELEASE_TYPE=alpha gpg_key_ID=F125BDF3 announcement
-
-where alpha can be replaced by beta or stable and F125BDF3 should be
-replaced with your key ID.
-
-Complete/fix the announcement file.  The generated list of recipients
-([email protected], [email protected], [email protected],
-[email protected], and [email protected]) is
-appropriate for a stable release or a "serious beta".  For any other
-release, drop at least [email protected].  For an example of how to
-fill out the rest of the template, search the mailing list archives
-for the most recent release announcement.
-
-For a stable release, send the same announcement on the comp.compilers
-newsgroup by sending email to [email protected].  Do not make any Cc as
-the moderator will throw away anything cross-posted or Cc'ed.  It really
-needs to be a separate message.
-
-** Prepare NEWS
-So that developers don't accidentally add new items to the old NEWS
-entry, create a new empty entry in line 3 (without the two leading
-spaces):
-
-  * Noteworthy changes in release ?.? (????-??-??) [?]
-
-Push these changes.
-
------
-
-Copyright (C) 2002-2005, 2007-2012 Free Software Foundation, Inc.
-
-This file is part of GNU Bison.
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
- LocalWords:  Automake Autoconf Gettext Gzip Rsync Valgrind gnulib submodules
- LocalWords:  submodule init cd distcheck checkin ChangeLog valgrind sigreturn
- LocalWords:  UC gcc DGNULIB POSIXCHECK xml XSLT glr lalr README po runtime rc
- LocalWords:  gnupload gnupg gpg keyserver BDF ncftp filename clearsign cvs dir
- LocalWords:  symlinks vti html lt POSIX Cc'ed
-
-Local Variables:
-mode: outline
-fill-column: 76
-End:

README-hacking.md

@@ -0,0 +1,531 @@
+This file attempts to describe the rules to use when hacking Bison.
+Don't put this file into the distribution.
+
+Everything related to the development of Bison is on Savannah:
+http://savannah.gnu.org/projects/bison/.
+
+
+Administrivia
+=============
+
+## If you incorporate a change from somebody on the net:
+First, if it is a large change, you must make sure they have signed the
+appropriate paperwork.  Second, be sure to add their name and email address
+to THANKS.
+
+## If a change fixes a test, mention the test in the commit message.
+
+## Bug reports
+If somebody reports a new bug, mention his name in the commit message and in
+the test case you write.  Put him into THANKS.
+
+The correct response to most actual bugs is to write a new test case which
+demonstrates the bug.  Then fix the bug, re-run the test suite, and check
+everything in.
+
+
+
+Hacking
+=======
+
+## Visible Changes
+Which include serious bug fixes, must be mentioned in NEWS.
+
+## Translations
+Only user visible strings are to be translated: error messages, bits of the
+.output file etc.  This excludes impossible error messages (comparable to
+assert/abort), and all the --trace output which is meant for the maintainers
+only.
+
+## Syntax highlighting
+It's quite nice to be in C++ mode when editing lalr1.cc for instance.
+However tools such as Emacs will be fooled by the fact that braces and
+parens do not nest, as in `[[}]]`.  As a consequence you might be misguided
+by its visual pairing to parens.  The m4-mode is safer.  Unfortunately the
+m4-mode is also fooled by `#` which is sees as a comment, stops pairing with
+parens/brackets that are inside...
+
+## Coding Style
+Do not add horizontal tab characters to any file in Bison's repository
+except where required.  For example, do not use tabs to format C code.
+However, make files, ChangeLog, and some regular expressions require tabs.
+Also, test cases might need to contain tabs to check that Bison properly
+processes tabs in its input.
+
+Prefer "res" as the name of the local variable that will be "return"ed by
+the function.
+
+### Bison
+Follow the GNU Coding Standards.
+
+Don't reinvent the wheel: we use gnulib, which features many components.
+Actually, Bison has legacy code that we should replace with gnulib modules
+(e.g., many ad hoc implementations of lists).
+
+### Skeletons
+We try to use the "typical" coding style for each language.
+
+#### CPP
+We indent the CPP directives this way:
+
+```
+#if FOO
+# if BAR
+#  define BAZ
+# endif
+#endif
+```
+
+Don't indent with leading spaces in the skeletons (it's ok in the grammar
+files though, e.g., in `%code {...}` blocks).
+
+On occasions, use `cppi -c` to see where we stand.  We don't aim at full
+correctness: depending `-d`, some bits can be in the *.c file, or the *.h
+file within the double-inclusion cpp-guards.  In that case, favor the case
+of the *.h file, but don't waste time on this.
+
+Don't hesitate to leave a comment on the `#endif` (e.g., `#endif /* FOO
+*/`), especially for long blocks.
+
+There is no conistency on `! defined` vs. `!defined`.  The day gnulib
+decides, we'll follow them.
+
+#### C/C++
+Follow the GNU Coding Standards.
+
+The `glr.c` skeleton was implemented with `camlCase`.  We are migrating it
+to `snake_case`.  Because we are standardizing the code, it is currently
+inconsistent.
+
+Use `YYFOO` and `yyfoo` for entities that are exposed to the user.  They are
+part of our contract with the users wrt backward compatibility.
+
+Use `YY_FOO` and `yy_foo` for private matters.  Users should not use them,
+we are free to change them without fear of backward compatibility issues.
+
+Use `*_t` for types, especially for `yy*_t` in which case we shouldn't worry
+about the C standard introducing such a name.
+
+#### C++
+Follow the C++ Core Guidelines
+(http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines).  The Google
+ones may be interesting too
+(https://google.github.io/styleguide/cppguide.html).
+
+Our enumerators, such as the kinds (symbol and token kinds), should be lower
+case, but it was too late to follow that track for token kinds, and symbol
+kind enumerators are made to be consistent with them.
+
+Use `*_type` for type aliases.  Use `foo_get()` and `foo_set(v)` for
+accessors, or simply `foo()` and `foo(v)`.
+
+Use the `yy` prefix for private stuff, but there's no need for it in the
+public API.  The `yy` prefix is already taken care of via the namespace.
+
+#### Java
+We follow https://www.oracle.com/technetwork/java/codeconventions-150003.pdf
+and https://google.github.io/styleguide/javaguide.html.  Unfortunately at
+some point some GNU Coding Style was installed in Java, but it's an error.
+So we should for instance stop putting spaces in function calls.  Because we
+are standardizing the code, it is currently inconsistent.
+
+Use a 2-space indentation (Google) rather than 4 (Oracle).
+
+Don't use the "yy" prefix for public members: "getExpectedTokens", not
+"yyexpectedTokens" or "yygetExpectedTokens".
+
+## Commit Messages
+Imitate the style we use.  Use `git log` to get sources of inspiration.
+
+If the changes have a small impact on Bison's generated parser, embed these
+changes in the commit itself.  If the impact is large, first push all the
+changes except those about src/parse-gram.[ch], and then another commit
+named "regen" which is only about them.
+
+## Debugging
+Bison supports tracing of its various steps, via the `--trace` option.
+Since it is not meant for the end user, it is not displayed by `bison
+--help`, nor is it documented in the manual.  Instead, run `bison
+--trace=help`.
+
+
+
+Working from the Repository
+===========================
+
+These notes intend to help people working on the checked-out sources.  These
+requirements do not apply when building from a distribution tarball.
+
+## Requirements
+
+We've opted to keep only the highest-level sources in the repository.  This
+eases our maintenance burden, (fewer merges etc.), but imposes more
+requirements on anyone wishing to build from the just-checked-out sources.
+For example, you have to use the latest stable versions of the maintainer
+tools we depend upon, including:
+
+- Autoconf <http://www.gnu.org/software/autoconf/>
+- Automake <http://www.gnu.org/software/automake/>
+- Flex <http://www.gnu.org/software/flex/>
+- Gettext <http://www.gnu.org/software/gettext/>
+- Graphviz <http://www.graphviz.org>
+- Gzip <http://www.gnu.org/software/gzip/>
+- Help2man <http://www.gnu.org/software/help2man/>
+- Perl <http://www.cpan.org/>
+- Rsync <http://samba.anu.edu.au/rsync/>
+- Tar <http://www.gnu.org/software/tar/>
+- Texinfo <http://www.gnu.org/software/texinfo/>
+
+Valgrind <http://valgrind.org/> is also highly recommended, if it supports
+your architecture.
+
+If you're using a GNU/Linux distribution, the easiest way to install the
+above packages depends on your system.  The following shell command should
+work for Debian-based systems such as Ubuntu:
+
+    sudo apt-get install \
+      autoconf automake autopoint flex graphviz help2man texinfo valgrind
+
+Bison is written using Bison grammars, so there are bootstrapping issues.
+The bootstrap script attempts to discover when the C code generated from the
+grammars is out of date, and to bootstrap with an out-of-date version of the
+C code, but the process is not foolproof.  Also, you may run into similar
+problems yourself if you modify Bison.
+
+Only building the initial full source tree will be a bit painful.  Later,
+after synchronizing from the repository a plain 'make' should be sufficient.
+Note, however, that when gnulib is updated, running './bootstrap' again
+might be needed.
+
+## First checkout
+
+Obviously, if you are reading these notes, you did manage to check out this
+package from the repository.  For the record, you will find all the relevant
+information on http://savannah.gnu.org/git/?group=bison.
+
+Bison uses Git submodules: subscriptions to other Git repositories.  In
+particular it uses gnulib, the GNU portability library.  To ask Git to
+perform the first checkout of the submodules, run
+
+    $ git submodule update --init
+
+The next step is to get other files needed to build, which are extracted
+from other source packages:
+
+    $ ./bootstrap
+
+Bootstrapping updates the submodules to the versions registered in the
+top-level directory.  To change gnulib, first check out the version you want
+in `gnulib`, then commit this change in Bison's repository, and finally run
+bootstrap.
+
+If it fails with missing symbols (e.g., `error: possibly undefined macro:
+AC_PROG_GNU_M4`), you are likely to have forgotten the submodule
+initialization part.  To recover from it, run `git reset --hard HEAD`, and
+restart with the submodule initialization.  Otherwise, there you are!  Just
+
+    $ ./configure
+    $ make
+    $ make check
+
+At this point, there should be no difference between your local copy, and
+the master copy:
+
+    $ git diff
+
+should output no difference.
+
+Enjoy!
+
+## Updating
+
+If you have git at version 1.8.2 or later, the command
+
+    $ git submodule update --recursive --remote
+
+will be useful for updating to the latest version of all submodules.
+
+Under earlier versions, use of submodules make things somewhat different
+because git does not yet support recursive operations: submodules must be
+taken care of explicitly.
+
+### Updating Bison
+
+If you pull a newer version of a branch, say via `git pull`, you might
+import requests for updated submodules.  A simple `git diff` will reveal if
+the current version of the submodule (i.e., the actual contents of the
+gnulib directory) and the current request from the subscriber (i.e., the
+reference of the version of gnulib that the Bison repository requests)
+differ.  To upgrade the submodules (i.e., to check out the version that is
+actually requested by the subscriber, run `git submodule update`.
+
+    $ git pull
+    $ git submodule update
+
+### Updating a submodule
+To update a submodule, say gnulib, do as follows:
+
+Get the most recent version of the master branch from git.
+
+    $ cd gnulib
+    $ git fetch
+    $ git checkout -b master --track origin/master
+
+Make sure Bison can live with that version of gnulib.
+
+    $ cd ..
+    $ ./bootstrap
+    $ make distcheck
+
+Register your changes.
+
+    $ git commit ...
+
+For a suggestion of what gnulib commit might be stable enough for a formal
+release, see the ChangeLog in the latest gnulib snapshot at
+http://erislabs.net/ianb/projects/gnulib/.
+
+The Autoconf files we use are currently:
+- m4/m4.m4
+- lib/m4sugar/m4sugar.m4
+- lib/m4sugar/foreach.m4
+
+These files don't change very often in Autoconf, so it should be relatively
+straight-forward to examine the differences in order to decide whether to
+update.
+
+## Troubleshooting
+
+Bison is self-hosted: its parser is generated by Bison.  We don't force
+ourselves to use the previous release of Bison, we use the current git
+master for several reasons:
+- dogfooding: let Bison be its first user
+- monitoring: seeing the diff on the generated parsers with git is very
+  helpful, as it allows to see easily the impact of the changes on a real
+  case parser.
+
+If you are unlucky the generated files, src/parse-gram.[ch], may be older
+than their source, src/parse-gram.y.  And your current version of Bison
+might not be able to grok it.  In that case, first refresh the generated
+files:
+
+    $ touch src/parse-gram.[ch]
+
+Then proceed.
+
+In case you wrecked your current copy of the parser, get back the previous
+version, compile bison, then force it to recreate the files:
+
+    $ git checkout HEAD^ src/parse-gram.[ch]
+    $ make -C _build
+    $ touch src/parse-gram.y
+    $ make -C _build
+
+
+Test Suite
+==========
+
+## make check
+Consume without moderation.  It is composed of two kinds of tests: the
+examples, and the main test suite.
+
+### The Examples
+In examples/, there is a number of ready-to-use examples (see
+examples/README.md).  These examples have small test suites run by `make
+check`.  The test results are in local `*.log` files (e.g.,
+`$build/examples/c/calc/calc.log`).
+
+### The Main Test Suite
+The main test suite, in tests/, is written on top of GNU Autotest, which is
+part of Autoconf.  Run `info autoconf 'Using Autotest'` to read the
+documentation, not only about how to write tests, but also where are the
+logs, how to read them etc.
+
+The main test suite generates a log for each test (e.g.,
+`$build/tests/testsuite.dir/004/testsuite.log` for test #4), and a main log
+file in `$build/tests/testsuite.log`.  The latter is meant for end users: it
+contains lots of details that should help diagnosing issues, including build
+issues.  The per-test logs are more convenient when working locally.
+
+#### TESTSUITEFLAGS
+To run just the main test suite, run `make check-local`.
+
+The default is for make check-local to run all tests sequentially.  This can
+be very time consuming when checking repeatedly or on slower setups.  This
+can be sped up in two ways:
+
+Using -j, in a make-like fashion, for example:
+
+    $ make check-local TESTSUITEFLAGS='-j8'
+
+Actually, when using GNU Make, TESTSUITEFLAGS defaults to the -jN passed to
+it, so you may simply run
+
+    $ make check-local -j8
+
+Running only the tests of a certain category, as specified in the AT files
+with AT_KEYWORDS([[category]]). Categories include:
+- c++, for c++ parsers
+- deprec, for tests concerning deprecated constructs.
+- glr, for glr parsers
+- java, for java parsers
+- report, for automaton dumps
+
+To get a list of all the tests (and their keywords for -k), run
+
+    $ ./tests/testsuite -l
+
+To run a specific set of tests, use -k (for "keyword"). For example:
+
+    $ make check-local TESTSUITEFLAGS='-k c++'
+
+Both can be combined.
+
+    $ make check-local TESTSUITEFLAGS='-j8 -k c++'
+
+To rerun the tests that failed:
+
+    $ make recheck -j5
+
+#### Updating the Expectations
+Sometimes some changes have a large impact on the test suite (e.g., when we
+added the `[-Wother]` part to all the warnings).  Part of the update can be
+done with a crude tool: `build-aux/update-test`.
+
+Once you ran the test suite, and therefore have many `testsuite.log` files,
+run, from the source tree:
+
+    $ ./build-aux/update-test $build/tests/testsuite.dir/*/testsuite.log
+
+where `$build` would be your build tree.  This will hopefully update most
+tests.  Re-run the test suite.  It might be interesting to run `update-test`
+again, since some early failures may stop latter tests from being run.  Yet
+at some point, you'll have to fix remaining issues by hand...
+
+
+## Running Java parsers
+Use the `javaexec.sh` script.  For instance to run the parser of test case
+504:
+
+    $ sh ./_build/javaexec.sh -cp ./_build/tests/testsuite.dir/504 Calc
+
+## make maintainer-check-valgrind
+This target uses valgrind both to check bison, and the generated parsers.
+
+This is not mature on Mac OS X.  First, Valgrind does support the way bison
+calls m4, so Valgrind cannot be used to check bison on Mac OS X.
+
+Second, there are many errors that come from the platform itself, not from
+bison.  build-aux/darwin11.4.0.valgrind addresses some of them.
+
+Third, valgrind issues warnings such as:
+
+    --99312:0:syswrap- WARNING: Ignoring sigreturn( ..., UC_RESET_ALT_STACK );
+
+which cause the test to fail uselessly.  It is hard to ignore these errors
+with a major overhaul of the way instrumentation is performed in the test
+suite.  So currently, do not try to run valgrind on Mac OS X.
+
+## Release checks
+Try to run the test suite with more severe conditions before a
+release:
+
+- Configure the package with --enable-gcc-warnings, so that one checks that
+  1. Bison compiles cleanly, 2. the parsers it produces compile cleanly too.
+
+- Maybe build with -DGNULIB_POSIXCHECK, which suggests gnulib modules that
+  can fix portability issues.  See if you really want to pay attention to
+  its warnings; there's no need to obey blindly to it
+  (<http://lists.gnu.org/archive/html/bison-patches/2012-05/msg00057.html>).
+
+- Check with `make syntax-check` if there are issues diagnosed by gnulib.
+
+- run `make maintainer-check` which:
+  - runs `valgrind -q bison` to run Bison under Valgrind.
+  - runs the parsers under Valgrind.
+  - runs the test suite with G++ as C compiler...
+
+- run `make maintainer-check-push`, which runs `make maintainer-check` while
+  activating the push implementation and its pull interface wrappers in many
+  test cases that were originally written to exercise only the pull
+  implementation.  This makes certain the push implementation can perform
+  every task the pull implementation can.
+
+- run `make maintainer-check-xml`, which runs `make maintainer-check` while
+  checking Bison's XML automaton report for every working grammar passed to
+  Bison in the test suite.  The check just diffs the output of Bison's
+  included XSLT style sheets with the output of --report=all and --graph.
+
+- running `make maintainer-check-release` takes care of running
+  maintainer-check, maintainer-check-push and maintainer-check-xml.
+
+- Change tests/atlocal/CFLAGS to add your preferred options.
+
+- Test with a very recent version of GCC for both C and C++.  Testing with
+  older versions that are still in use is nice too.
+
+## gnulib
+To run tests on gnulib components (e.g., on bitset):
+
+    cd gnulib
+    ./gnulib-tool --test bitset-tests
+
+possibly within a specified environment:
+
+    CC='gcc-mp-8 -fsanitize=undefined' ./gnulib-tool --test bitset-tests
+
+To be able to run the tests several times, and to use symlinks instead of
+copies so that one can update the origin gnulib directory and immediately
+re-run the tests, run:
+
+    ./gnulib-tool --symlink --create-test --dir=/tmp/gnutest bitset-tests
+    cd /tmp/gnutest
+    ./configure -C CC='gcc-mp-8 -fsanitize=undefined' CFLAGS='-ggdb'
+    make check
+
+
+
+Release Procedure
+=================
+
+See README-release.
+
+<!--
+
+Copyright (C) 2002-2005, 2007-2015, 2018-2020 Free Software Foundation,
+Inc.
+
+This file is part of GNU Bison.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Local Variables:
+mode: markdown
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+LocalWords:  Automake Autoconf Gettext Gzip Rsync Valgrind gnulib submodules
+LocalWords:  submodule init cd distcheck ChangeLog valgrind sigreturn sudo
+LocalWords:  UC gcc DGNULIB POSIXCHECK xml XSLT glr lalr README po runtime rc
+LocalWords:  gnupload gnupg gpg keyserver BDF ncftp filename clearsign cvs dir
+LocalWords:  symlinks vti html lt POSIX Cc'ed Graphviz Texinfo autoconf jN
+LocalWords:  automake autopoint graphviz texinfo PROG Wother parsers YYFOO
+LocalWords:  TESTSUITEFLAGS deprec struct gnulib's getopt config ggdb yyfoo
+LocalWords:  bitset fsanitize symlink CFLAGS MERCHANTABILITY ispell wrt YY
+LocalWords:  american Administrivia camlCase yy accessors namespace src
+LocalWords:  getExpectedTokens yyexpectedTokens yygetExpectedTokens
+LocalWords:  regen dogfooding Autotest testsuite
+
+-->

README.md

@@ -0,0 +1 @@
+README

REFERENCES

@@ -1,33 +0,0 @@
-From phr Tue Jul  8 10:36:19 1986
-Date: Tue, 8 Jul 86 00:52:24 EDT
-From: phr (Paul Rubin)
-To: riferguson%[email protected], tower
-Subject: Re:  Bison documentation?
-
-The main difference between Bison and Yacc that I know of is that
-Bison supports the @N construction, which gives you access to
-the starting and ending line number and character number associated
-with any of the symbols in the current rule.
-
-Also, Bison supports the command `%expect N' which says not to mention
-the conflicts if there are N shift/reduce conflicts and no reduce/reduce
-conflicts.
-
-The differences in the algorithms stem mainly from the horrible
-kludges that Johnson had to perpetrate to make Yacc fit in a PDP-11.
-
-Also, Bison uses a faster but less space-efficient encoding for the
-parse tables (see Corbett's PhD thesis from Berkeley, "Static
-Semantics in Compiler Error Recovery", June 1985, Report No. UCB/CSD
-85/251), and more modern technique for generating the lookahead sets.
-(See Frank DeRemer and Thomas Pennello, "Efficient Computation of
-LALR(1) Look-Ahead Sets", ACM Transactions on Programming Languages
-and Systems (TOPLAS) 4, 4 (October 1982), 615-649.  Their
-technique is the standard one now.)
-
-	paul rubin
-	free software foundation
-
-
-[DeRemer-Pennello reference corrected by Paul Eggert <[email protected]>,
- 2004-06-21.]

THANKS

@@ -1,136 +1,234 @@
 Bison was originally written by Robert Corbett.  It would not be what
 it is today without the invaluable help of these people:
 
+Aaro Koskinen             [email protected]
+Аскар Сафин               [email protected]
+Adam Sampson              [email protected]
+Adrian Vogelsgesang       [email protected]
+Ahcheong Lee              [email protected]
 Airy Andre                [email protected]
-Akim Demaille             akim@freefriends.org
+Akim Demaille             akim@gnu.org
 Albert Chin-A-Young       [email protected]
 Alexander Belopolsky      [email protected]
 Alexandre Duret-Lutz      [email protected]
+Andre da Costa Barros     [email protected]
+Andreas Damm              [email protected]
 Andreas Schwab            [email protected]
 Andrew Suffield           [email protected]
 Angelo Borsotti           [email protected]
 Anthony Heading           [email protected]
+Antonio Silva Correia     [email protected]
 Arnold Robbins            [email protected]
 Art Haas                  [email protected]
+Arthur Schwarz            [email protected]
+Askar Safin               [email protected]
+Balázs Scheidler          [email protected]
 Baron Schwartz            [email protected]
 Ben Pfaff                 [email protected]
 Benoit Perrot             [email protected]
+Bernd Edlinger            [email protected]
 Bernd Kiefer              [email protected]
 Bert Deknuydt             [email protected]
 Bill Allombert            [email protected]
 Bob Rossi                 [email protected]
 Brandon Lucia             [email protected]
+Brooks Moses              [email protected]
 Bruce Lilly               [email protected]
 Bruno Haible              [email protected]
 Charles-Henri de Boysson  [email protected]
 Christian Burger          [email protected]
+Clément Démoulins         [email protected]
+Colin Daley               [email protected]
 Cris Bailiff              [email protected]
 Cris van Pelt             [email protected]
 Csaba Raduly              [email protected]
 Dagobert Michelsen        [email protected]
+Daniel Frużyński          [email protected]
+Daniel Galloway           [email protected]
 Daniel Hagerty            [email protected]
+David Barto               [email protected]
 David J. MacKenzie        [email protected]
 David Kastrup             [email protected]
+David Michael             [email protected]
+Dengke Du                 [email protected]
+Denis Excoffier           [email protected]
+Dennis Clarke             [email protected]
+Derek Clegg               [email protected]
 Derek M. Jones            [email protected]
 Di-an Jan                 [email protected]
 Dick Streefland           [email protected]
 Didier Godefroy           [email protected]
+Don Macpherson            [email protected]
+Efi Fogel                 [email protected]
 Enrico Scholz             [email protected]
 Eric Blake                [email protected]
+Eric S. Raymond           [email protected]
+Étienne Renault           [email protected]
+Evan Lavelle              [email protected]
+Evan Nemerson             [email protected]
 Evgeny Stambulchik        [email protected]
 Fabrice Bauzac            [email protected]
+Ferdinand Thiessen        [email protected]
 Florian Krohm             [email protected]
 Frank Heckenbach          [email protected]
 Frans Englich             [email protected]
+Gabriel Rassoul           [email protected]
+Gary L Peskin             [email protected]
+Gavin Smith               [email protected]
 Georg Sauthoff            [email protected]
 George Neuner             [email protected]
 Gilles Espinasse          [email protected]
 Goran Uddeborg            [email protected]
 Guido Trentalancia        [email protected]
 H. Merijn Brand           [email protected]
-Hans Aberg                haberg@matematik.su.se
+Hans Åberg                haberg[email protected]
+Horst Von Brand           [email protected]
 Jan Nieuwenhuizen         [email protected]
+Jannick                   [email protected]
+Jeff Hammond              [email protected]
 Jerry Quinn               [email protected]
 Jesse Thilo               [email protected]
 Jim Kent                  [email protected]
 Jim Meyering              [email protected]
 Joel E. Denny             [email protected]
 Johan van Selst           [email protected]
+John Horigan              [email protected]
+Jonathan Fabrizio         [email protected]
 Jonathan Nieder           [email protected]
+Josh Soref                [email protected]
 Juan Manuel Guerrero      [email protected]
+Karl Berry                [email protected]
 Kees Zeelenberg           [email protected]
 Keith Browne              [email protected]
+Ken Moffat                [email protected]
+Kiyoshi Kanazawa          [email protected]
+Lars Maier                [email protected]
+László Várady             [email protected]
 Laurent Mascherpa         [email protected]
 Lie Yan                   [email protected]
 Magnus Fromreide          [email protected]
 Marc Autret               [email protected]
+Marc Mendiola             [email protected]
+Marc Schönefeld           [email protected]
+Mark Boyall               [email protected]
 Martin Jacobs             [email protected]
 Martin Mokrejs            [email protected]
 Martin Nylin              [email protected]
 Matt Kraai                [email protected]
 Matt Rosing               [email protected]
+Maxim Prohorenko          [email protected]
+Michael Catanzaro         [email protected]
+Michael Felt              [email protected]
 Michael Hayes             [email protected]
 Michael Raskin            [email protected]
+Michel d'Hooge            [email protected]
+Michiel De Wilde          [email protected]
 Mickael Labau             [email protected]
 Mike Castle               [email protected]
+Mike Frysinger            [email protected]
+Mike Sullivan             [email protected]
+Nate Guerin               [email protected]
 Neil Booth                [email protected]
 Nelson H. F. Beebe        [email protected]
+neok m4700                [email protected]
+Nick Bowler               [email protected]
+Nicolas Bedon             [email protected]
 Nicolas Burrus            [email protected]
 Nicolas Tisserand         [email protected]
+Nikki Valen               [email protected]
 Noah Friedman             [email protected]
 Odd Arild Olsen           [email protected]
 Oleg Smolsky              [email protected]
+Oleksii Taran             [email protected]
+Oliver Mangold            [email protected]
 Paolo Bonzini             [email protected]
+Paolo Simone Gasparello   [email protected]
 Pascal Bart               [email protected]
+Patrice Dumas             [email protected]
 Paul Eggert               [email protected]
 Paul Hilfinger            [email protected]
 Per Allansson             [email protected]
+Peter Eisentraut          [email protected]
 Peter Fales               [email protected]
 Peter Hamorsky            [email protected]
+Peter Simons              [email protected]
+Petr Machata              [email protected]
+Pho                       [email protected]
 Piotr Gackiewicz          [email protected]
+Piotr Marcińczyk          [email protected]
+Pramod Kumbhar            [email protected]
+Quentin Hocquet           [email protected]
 Quoc Peyrot               [email protected]
 R Blake                   [email protected]
 Raja R Harinath           [email protected]
 Ralf Wildenhues           [email protected]
+Rich Wilson               [email protected]
 Richard Stallman          [email protected]
+Rici Lake                 [email protected]
+Rob Conde                 [email protected]
 Rob Vermaas               [email protected]
 Robert Anisko             [email protected]
+Robert Yang               [email protected]
+Roland Levillain          [email protected]
 Satya Kiran Popuri        [email protected]
 Sebastian Setzer          [email protected]
 Sebastien Fricker         [email protected]
+Sébastien Villemot        [email protected]
 Sergei Steshenko          [email protected]
 Shura                     [email protected]
+Simon Sobisch             [email protected]
 Stefano Lattarini         [email protected]
+Stephen Cameron           [email protected]
 Steve Murphy              [email protected]
 Sum Wu                    [email protected]
+Théophile Ranquet         [email protected]
 Thiru Ramakrishnan        [email protected]
+Thomas Jahns              [email protected]
+Thomas Petazzoni          [email protected]
 Tim Josling               [email protected]
 Tim Landscheidt           [email protected]
 Tim Van Holder            [email protected]
+Tobias Frost              [email protected]
+Todd Freed                [email protected]
+Tom Kramer                [email protected]
 Tom Lane                  [email protected]
 Tom Tromey                [email protected]
+Tomasz Kłoczko            [email protected]
 Tommy Nordgren            [email protected]
 Troy A. Johnson           [email protected]
 Tys Lefering              [email protected]
+Uxio Prego                [email protected]
+Valentin Tolmer           [email protected]
+wcventure                 [email protected]
+Victor Khomenko           [email protected]
+Victor Zverovich          [email protected]
 Vin Shelton               [email protected]
 W.C.A. Wijngaards         [email protected]
 Wayne Green               [email protected]
 Wei Song                  [email protected]
+Wojciech Polak            [email protected]
 Wolfgang S. Kechel        [email protected]
+Wolfgang Thaller          [email protected]
 Wolfram Wagner            [email protected]
 Wwp                       [email protected]
+xolodho                   [email protected]
+Yuichiro Kaneko           [email protected]
 Zack Weinberg             [email protected]
+江 祖铭                    [email protected]
+長田偉伸                   [email protected]
+马俊                       [email protected]
 
 Many people are not named here because we lost track of them.  We
 thank them!  Please, help us keeping this list up to date.
 
 Local Variables:
 mode: text
+coding: utf-8
 End:
 
 -----
 
-Copyright (C) 2000-2012 Free Software Foundation, Inc.
+Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Parser Generator.
 

TODO

@@ -1,13 +1,300 @@
+* Bison 3.6
+** Questions
+*** Java
+- Should i18n be part of the Lexer?  Currently it's a static method of
+  Lexer.
+
+- is there a migration path that would allow to use TokenKinds in
+  yylex?
+
+- define the tokens as an enum too.
+
+- promote YYEOF rather than EOF.
+
+*** D
+- is there a way to attach yysymbol_name to the enum itself?  As we did
+  in Java.
+
+- It would be better to have TokenKind as return value.  Can we use
+  reflection to support both output types?
+
+** YYerror
+https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=blob;f=gettext-runtime/intl/plural.y;h=a712255af4f2f739c93336d4ff6556d932a426a5;hb=HEAD
+
+should be updated to not use YYERRCODE.  Returning an undef token is good
+enough.
+
+** Java
+*** calc.at
+Stop hard-coding "Calc".  Adjust local.at (look for FIXME).
+
+* Bison 3.7
+** Counter example generation
+See https://github.com/akimd/bison/pull/15.
+
+** Clean up
+Rename user_token_number for tokens as "code".  It's not a "user number",
+it's the token code, and the user can control it, but this code always
+exists.
+
+See also USER_NUMBER_UNDEFINED and NUMBER_UNDEFINED.
+
+Rename endtoken as eoftoken.
+
+Also do it in data/skeletons.
+
+Don't rename in Bison 3.6 (it would be logical to do so) because that
+would probably create many conflicts in Vincent's work (see previous point).
+
+** A dev warning for b4_
+Maybe we should check for m4_ and b4_ leaking out of the m4 processing, as
+Autoconf does.  It would have caught overquotation issues.
+
+** doc
+I feel it's ugly to use the GNU style to declare functions in the doc.  It
+generates tons of white space in the page, and may contribute to bad page
+breaks.
+
+** consistency
+token vs terminal, variable vs non terminal.
+
+** api.token.raw
+The YYUNDEFTOK could be assigned a semantic value so that yyerror could be
+used to report invalid lexemes.
+
+** push parsers
+Consider deprecating impure push parsers.  They add a lot of complexity, for
+a bad feature.  On the other hand, that would make it much harder to sit
+push parsers on top of pull parser.  Which is currently not relevant, since
+push parsers are measurably slower.
+
+** %define parse.error formatted
+How about pushing bistromathics' yyreport_syntax_error as another standard
+way to generate the error message, and leave to the user the task of
+providing the message formats?  Currently in bistro, it reads:
+
+    const char *
+    error_format_string (int argc)
+    {
+      switch (argc)
+        {
+        default: /* Avoid compiler warnings. */
+        case 0: return _("%@: syntax error");
+        case 1: return _("%@: syntax error: unexpected %u");
+          // TRANSLATORS: '%@' is a location in a file, '%u' is an
+          // "unexpected token", and '%0e', '%1e'... are expected tokens
+          // at this point.
+          //
+          // For instance on the expression "1 + * 2", you'd get
+          //
+          // 1.5: syntax error: expected - or ( or number or function or variable before *
+        case 2: return _("%@: syntax error: expected %0e before %u");
+        case 3: return _("%@: syntax error: expected %0e or %1e before %u");
+        case 4: return _("%@: syntax error: expected %0e or %1e or %2e before %u");
+        case 5: return _("%@: syntax error: expected %0e or %1e or %2e or %3e before %u");
+        case 6: return _("%@: syntax error: expected %0e or %1e or %2e or %3e or %4e before %u");
+        case 7: return _("%@: syntax error: expected %0e or %1e or %2e or %3e or %4e or %5e before %u");
+        case 8: return _("%@: syntax error: expected %0e or %1e or %2e or %3e or %4e or %5e or %6e before %u");
+        }
+    }
+
+The message would have to be generated in a string, and pushed to yyerror.
+Which will be a pain in the neck in yacc.c.
+
+If we want to do that, we should think very carefully about the syntax of
+the format string.
+
+** yyclearin does not invoke the lookahead token's %destructor
+https://lists.gnu.org/r/bug-bison/2018-02/msg00000.html
+Rici:
+
+> Modifying yyclearin so that it calls yydestruct seems like the simplest
+> solution to this issue, but it is conceivable that such a change would
+> break programs which already perform some kind of workaround in order to
+> destruct the lookahead symbol. So it might be necessary to use some kind of
+> compatibility %define, or to create a new replacement macro with a
+> different name such as yydiscardin.
+>
+> At a minimum, the fact that yyclearin does not invoke the %destructor
+> should be highlighted in the documentation, since it is not at all obvious.
+
+* Bison 3.8
+** Unit rules / Injection rules (Akim Demaille)
+Maybe we could expand unit rules (or "injections", see
+https://homepages.cwi.nl/~daybuild/daily-books/syntax/2-sdf/sdf.html), i.e.,
+transform
+
+        exp: arith | bool;
+        arith: exp '+' exp;
+        bool: exp '&' exp;
+
+into
+
+        exp: exp '+' exp | exp '&' exp;
+
+when there are no actions.  This can significantly speed up some grammars.
+I can't find the papers.  In particular the book 'LR parsing: Theory and
+Practice' is impossible to find, but according to 'Parsing Techniques: a
+Practical Guide', it includes information about this issue.  Does anybody
+have it?
+
+** clean up (Akim Demaille)
+Do not work on these items now, as I (Akim) have branches with a lot of
+changes in this area (hitting several files), and no desire to have to fix
+conflicts.  Addressing these items will happen after my branches have been
+merged.
+
+*** lalr.c
+Introduce a goto struct, and use it in place of from_state/to_state.
+Rename states1 as path, length as pathlen.
+Introduce inline functions for things such as nullable[*rp - ntokens]
+where we need to map from symbol number to nterm number.
+
+There are probably a significant part of the relations management that
+should be migrated on top of a bitsetv.
+
+*** closure
+It should probably take a "state*" instead of two arguments.
+
+*** traces
+The "automaton" and "set" categories are not so useful.  We should probably
+introduce lr(0) and lalr, just the way we have ielr categories.  The
+"closure" function is too verbose, it should probably have its own category.
+
+"set" can still be used for summariring the important sets.  That would make
+tests easy to maintain.
+
+*** complain.*
+Rename these guys as "diagnostics.*" (or "diagnose.*"), since that's the
+name they have in gcc, clang, etc.  Likewise for the complain_* series of
+functions.
+
+*** ritem
+states/nstates, rules/nrules, ..., ritem/nritems
+Fix the latter.
+
+* Better error messages
+The users are not provided with enough tools to forge their error messages.
+See for instance "Is there an option to change the message produced by
+YYERROR_VERBOSE?" by Simon Sobisch, on bison-help.
+
+See also
+https://www.cs.tufts.edu/~nr/cs257/archive/clinton-jefferey/lr-error-messages.pdf
+https://research.swtch.com/yyerror
+http://gallium.inria.fr/~fpottier/publis/fpottier-reachability-cc2016.pdf
+
+* Modernization
+Fix data/skeletons/yacc.c so that it defines YYPTRDIFF_T properly for modern
+and older C++ compilers.  Currently the code defaults to defining it to
+'long' for non-GCC compilers, but it should use the proper C++ magic to
+define it to the same type as the C ptrdiff_t type.
+
+* Completion
+Several features are not available in all the backends.
+
+- push parsers: glr.c, glr.cc, lalr1.cc
+- lac: D, Java
+- glr: D, Java
+- token constructors: Java, C, D
+
+* Bugs
+** Autotest has quotation issues
+tests/input.at:1730:AT_SETUP([%define errors])
+
+->
+
+$ ./tests/testsuite -l | grep errors | sed q
+  38: input.at:1730      errors
+
 * Short term
-** Variable names.
-What should we name `variant' and `lex_symbol'?
+** Get rid of YYPRINT and b4_toknum
+Besides yytoknum is wrong when api.token.raw is defined.
 
-** Use b4_symbol in all the skeleton
-Move its definition in the more standard places and deploy it in other
-skeletons.  Then remove the older system, including the tables
-generated by output.c
+** Better design for diagnostics
+The current implementation of diagnostics is ad hoc, it grew organically.
+It works as a series of calls to several functions, with dependency of the
+latter calls on the former.  For instance:
+
+      complain (&sym->location,
+                sym->content->status == needed ? complaint : Wother,
+                _("symbol %s is used, but is not defined as a token"
+                  " and has no rules; did you mean %s?"),
+                quote_n (0, sym->tag),
+                quote_n (1, best->tag));
+      if (feature_flag & feature_caret)
+        location_caret_suggestion (sym->location, best->tag, stderr);
+
+We should rewrite this in a more FP way:
+
+1. build a rich structure that denotes the (complete) diagnostic.
+   "Complete" in the sense that it also contains the suggestions, the list
+   of possible matches, etc.
+
+2. send this to the pretty-printing routine.  The diagnostic structure
+   should be sufficient so that we can generate all the 'format' of
+   diagnostics, including the fixits.
+
+If properly done, this diagnostic module can be detached from Bison and be
+put in gnulib.  It could be used, for instance, for errors caught by
+xgettext.
+
+There's certainly already something alike in GCC.  At least that's the
+impression I get from reading the "-fdiagnostics-format=FORMAT" part of this
+page:
+
+https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html
+
+** Graphviz display code thoughts
+The code for the --graph option is over two files: print_graph, and
+graphviz. This is because Bison used to also produce VCG graphs, but since
+this is no longer true, maybe we could consider these files for fusion.
+
+An other consideration worth noting is that print_graph.c (correct me if I
+am wrong) should contain generic functions, whereas graphviz.c and other
+potential files should contain just the specific code for that output
+format. It will probably prove difficult to tell if the implementation is
+actually generic whilst only having support for a single format, but it
+would be nice to keep stuff a bit tidier: right now, the construction of the
+bitset used to show reductions is in the graphviz-specific code, and on the
+opposite side we have some use of \l, which is graphviz-specific, in what
+should be generic code.
+
+Little effort seems to have been given to factoring these files and their
+rint{,-xml} counterpart. We would very much like to re-use the pretty format
+of states from .output for the graphs, etc.
+
+Since graphviz dies on medium-to-big grammars, maybe consider an other tool?
+
+** push-parser
+Check it too when checking the different kinds of parsers.  And be
+sure to check that the initial-action is performed once per parsing.
+
+** m4 names
+b4_shared_declarations is no longer what it is.  Make it
+b4_parser_declaration for instance.
+
+** yychar in lalr1.cc
+There is a large difference bw maint and master on the handling of
+yychar (which was removed in lalr1.cc).  See what needs to be
+back-ported.
+
+
+    /* User semantic actions sometimes alter yychar, and that requires
+       that yytoken be updated with the new translation.  We take the
+       approach of translating immediately before every use of yytoken.
+       One alternative is translating here after every semantic action,
+       but that translation would be missed if the semantic action
+       invokes YYABORT, YYACCEPT, or YYERROR immediately after altering
+       yychar.  In the case of YYABORT or YYACCEPT, an incorrect
+       destructor might then be invoked immediately.  In the case of
+       YYERROR, subsequent parser actions might lead to an incorrect
+       destructor call or verbose syntax error message before the
+       lookahead is translated.  */
+
+    /* Make sure we have latest lookahead translation.  See comments at
+       user semantic actions for why this is necessary.  */
+    yytoken = yytranslate_ (yychar);
 
-** Update the documentation on gnu.org
 
 ** Get rid of fake #lines [Bison: ...]
 Possibly as simple as checking whether the column number is nonnegative.
@@ -32,66 +319,15 @@ class in the printers/destructors, which is not good for an operator<<
 since it is no longer bound to a particular parser, it's just a
 (standalone symbol).
 
-** Rename LR0.cc
-as lr0.cc, why upper case?
-
-** bench several bisons.
-Enhance bench.pl with %b to run different bisons.
-
 * Various
-** Warnings
-Warnings about type tags that are used in printer and dtors, but not
-for symbols?
+** Rewrite glr.cc in C++ (Valentin Tolmer)
+As a matter of fact, it would be very interesting to see how much we can
+share between lalr1.cc and glr.cc.  Most of the skeletons should be common.
+It would be a very nice source of inspiration for the other languages.
 
-** YYERRCODE
-Defined to 256, but not used, not documented.  Probably the token
-number for the error token, which POSIX wants to be 256, but which
-Bison might renumber if the user used number 256.  Keep fix and doc?
-Throw away?
+Valentin Tolmer is working on this.
 
-Also, why don't we output the token name of the error token in the
-output?  It is explicitly skipped:
-
-      /* Skip error token and tokens without identifier.  */
-      if (sym != errtoken && id)
-
-Of course there are issues with name spaces, but if we disable we have
-something which seems to be more simpler and more consistent instead
-of the special case YYERRCODE.
-
-   enum yytokentype {
-     error = 256,
-     // ...
-   };
-
-
-We could (should?) also treat the case of the undef_token, which is
-numbered 257 for yylex, and 2 internal.  Both appear for instance in
-toknum:
-
-  const unsigned short int
-  parser::yytoken_number_[] =
-  {
-       0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
-
-while here
-
-   enum yytokentype {
-     TOK_EOF = 0,
-     TOK_EQ = 258,
-
-so both 256 and 257 are "mysterious".
-
-  const char*
-  const parser::yytname_[] =
-  {
-  "\"end of command\"", "error", "$undefined", "\"=\"", "\"break\"",
-
-
-** YYFAIL
-It is seems to be *really* obsolete now, shall we remove it?
-
-** yychar == yyempty_
+** yychar == YYEMPTY
 The code in yyerrlab reads:
 
       if (yychar <= YYEOF)
@@ -108,12 +344,6 @@ really possible?  The test suite does not exercise this case.
 This shows that it would be interesting to manage to install skeleton
 coverage analysis to the test suite.
 
-** Table definitions
-It should be very easy to factor the definition of the various tables,
-including the separation bw declaration and definition.  See for
-instance b4_table_define in lalr1.cc.  This way, we could even factor
-C vs. C++ definitions.
-
 * From lalr1.cc to yacc.c
 ** Single stack
 Merging the three stacks in lalr1.cc simplified the code, prompted for
@@ -121,10 +351,13 @@ other improvements and also made it faster (probably because memory
 management is performed once instead of three times).  I suggest that
 we do the same in yacc.c.
 
-** yysyntax_error
-The code bw glr.c and yacc.c is really alike, we can certainly factor
-some parts.
+(Some time later): it's also very nice to have three stacks: it's more dense
+as we don't lose bits to padding.  For instance the typical stack for states
+will use 8 bits, while it is likely to consume 32 bits in a struct.
 
+We need trustworthy benchmarks for Bison, for all our backends.  Akim has a
+few things scattered around; we need to put them in the repo, and make them
+more useful.
 
 * Report
 
@@ -135,20 +368,20 @@ grammars she is working on.  We should probably also include some
 information about the variables (I'm not sure for instance we even
 specify what LR variant was used).
 
-**  GLR
+** GLR
 How would Paul like to display the conflicted actions?  In particular,
 what when two reductions are possible on a given lookahead token, but one is
 part of $default.  Should we make the two reductions explicit, or just
 keep $default?  See the following point.
 
 ** Disabled Reductions
-See `tests/conflicts.at (Defaulted Conflicted Reduction)', and decide
+See 'tests/conflicts.at (Defaulted Conflicted Reduction)', and decide
 what we want to do.
 
 ** Documentation
 Extend with error productions.  The hard part will probably be finding
 the right rule so that a single state does not exhibit too many yet
-undocumented ``features''.  Maybe an empty action ought to be
+undocumented ''features''.  Maybe an empty action ought to be
 presented too.  Shall we try to make a single grammar with all these
 features, or should we have several very small grammars?
 
@@ -157,11 +390,62 @@ Provide better assistance for understanding the conflicts by providing
 a sample text exhibiting the (LALR) ambiguity.  See the paper from
 DeRemer and Penello: they already provide the algorithm.
 
-** Statically check for potential ambiguities in GLR grammars.  See
-<http://www.i3s.unice.fr/~schmitz/papers.html#expamb> for an approach.
-
+** Statically check for potential ambiguities in GLR grammars
+See <http://www.lsv.fr/~schmitz/pub/expamb.pdf> for an approach.
+An Experimental Ambiguity Detection Tool ∗ Sylvain Schmitz
+LORIA, INRIA Nancy - Grand Est, Nancy, France
 
 * Extensions
+** More languages?
+Well, only if there is really some demand for it.
+
+*** PHP
+https://github.com/scfc/bison-php/blob/master/data/lalr1.php
+
+*** Python
+https://lists.gnu.org/r/bison-patches/2013-09/msg00000.html and following
+
+** Multiple start symbols
+Would be very useful when parsing closely related languages.  The idea is to
+declare several start symbols, for instance
+
+    %start stmt expr
+    %%
+    stmt: ...
+    expr: ...
+
+and to generate parse(), parse_stmt() and parse_expr().  Technically, the
+above grammar would be transformed into
+
+   %start yy_start
+   %token YY_START_STMT YY_START_EXPR
+   %%
+   yy_start: YY_START_STMT stmt | YY_START_EXPR expr
+
+so that there are no new conflicts in the grammar (as would undoubtedly
+happen with yy_start: stmt | expr).  Then adjust the skeletons so that this
+initial token (YY_START_STMT, YY_START_EXPR) be shifted first in the
+corresponding parse function.
+
+** %include
+This is a popular demand.  We already made many changes in the parser that
+should make this reasonably easy to implement.
+
+Bruce Mardle <[email protected]>
+https://lists.gnu.org/archive/html/bison-patches/2015-09/msg00000.html
+
+However, there are many other things to do before having such a feature,
+because I don't want a % equivalent to #include (which we all learned to
+hate).  I want something that builds "modules" of grammars, and assembles
+them together, paying attention to keep separate bits separated, in pseudo
+name spaces.
+
+** Push parsers
+There is demand for push parsers in Java and C++.  And GLR I guess.
+
+** Generate code instead of tables
+This is certainly quite a lot of work.  See
+http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.50.4539.
 
 ** $-1
 We should find a means to provide an access to values deep in the
@@ -182,6 +466,10 @@ must be in the scanner: we must not parse what is in a switched off
 part of %if.  Akim Demaille thinks it should be in the parser, so as
 to avoid falling into another CPP mistake.
 
+(Later): I'm sure there's actually good case for this.  People who need that
+feature can use m4/cpp on top of Bison.  I don't think it is worth the
+trouble in Bison itself.
+
 ** XML Output
 There are couple of available extensions of Bison targeting some XML
 output.  Some day we should consider including them.  One issue is
@@ -197,30 +485,12 @@ XML output for GNU Bison and gcc
 XML output for GNU Bison
    http://yaxx.sourceforge.net/
 
-* Unit rules
-Maybe we could expand unit rules, i.e., transform
+** Counterexample generation
+https://lists.gnu.org/archive/html/bug-bison/2016-06/msg00000.html
+http://www.cs.cornell.edu/andru/papers/cupex/
 
-        exp: arith | bool;
-        arith: exp '+' exp;
-        bool: exp '&' exp;
-
-into
-
-        exp: exp '+' exp | exp '&' exp;
-
-when there are no actions.  This can significantly speed up some
-grammars.  I can't find the papers.  In particular the book `LR
-parsing: Theory and Practice' is impossible to find, but according to
-`Parsing Techniques: a Practical Guide', it includes information about
-this issue.  Does anybody have it?
-
-
-
-* Documentation
-
-** History/Bibliography
-Some history of Bison and some bibliography would be most welcome.
-Are there any Texinfo standards for bibliography?
+Andrew Myers and Vincent Imbimbo are working on this item, see
+https://github.com/akimd/bison/issues/12
 
 * Coding system independence
 Paul notes:
@@ -239,10 +509,7 @@ Paul notes:
         tokens, either via escapes (e.g., "x\0y") or via a NUL byte in
         the source code.  This should get fixed.
 
-* --graph
-Show reductions.
-
-* Broken options ?
+* Broken options?
 ** %token-table
 ** Skeleton strategy
 Must we keep %token-table?
@@ -254,33 +521,7 @@ It is unfortunate that there is a total order for precedence.  It
 makes it impossible to have modular precedence information.  We should
 move to partial orders (sounds like series/parallel orders to me).
 
-** RR conflicts
-See if we can use precedence between rules to solve RR conflicts.  See
-what POSIX says.
-
-
-* $undefined
-From Hans:
-- If the Bison generated parser experiences an undefined number in the
-character range, that character is written out in diagnostic messages, an
-addition to the $undefined value.
-
-Suggest: Change the name $undefined to undefined; looks better in outputs.
-
-
-* Default Action
-From Hans:
-- For use with my C++ parser, I transported the "switch (yyn)" statement
-that Bison writes to the bison.simple skeleton file. This way, I can remove
-the current default rule $$ = $1 implementation, which causes a double
-assignment to $$ which may not be OK under C++, replacing it with a
-"default:" part within the switch statement.
-
-Note that the default rule $$ = $1, when typed, is perfectly OK under C,
-but in the C++ implementation I made, this rule is different from
-$<type_name>$ = $<type_name>1. I therefore think that one should implement
-a Bison option where every typed default rule is explicitly written out
-(same typed ruled can of course be grouped together).
+This is a prerequisite for modules.
 
 * Pre and post actions.
 From: Florian Krohm <[email protected]>
@@ -313,32 +554,17 @@ to bison. If you're interested, I'll work on a patch.
 * Better graphics
 Equip the parser with a means to create the (visual) parse tree.
 
-* Complaint submessage indentation.
-We already have an implementation that works fairly well for named
-reference messages, but it would be nice to use it consistently for all
-submessages from Bison.  For example, the "previous definition"
-submessage or the list of correct values for a %define variable might
-look better with indentation.
-
-However, the current implementation makes the assumption that the
-location printed on the first line is not usually much shorter than the
-locations printed on the submessage lines that follow.  That assumption
-may not hold true as often for some kinds of submessages especially if
-we ever support multiple grammar files.
-
-Here's a proposal for how a new implementation might look:
-
-  http://lists.gnu.org/archive/html/bison-patches/2009-09/msg00086.html
-
 
 Local Variables:
 mode: outline
 coding: utf-8
+fill-column: 76
 End:
 
 -----
 
-Copyright (C) 2001-2004, 2006, 2008-2012 Free Software Foundation, Inc.
+Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2020 Free Software
+Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 

bootstrap

@@ -1,10 +1,10 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2012-07-19.14; # UTC
+scriptversion=2020-04-13.15; # UTC
 
 # Bootstrap this package from checked-out sources.
 
-# Copyright (C) 2003-2012 Free Software Foundation, Inc.
+# Copyright (C) 2003-2020 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -17,7 +17,7 @@ scriptversion=2012-07-19.14; # UTC
 # GNU General Public License for more details.
 
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 # Originally written by Paul Eggert.  The canonical version of this
 # script is maintained as build-aux/bootstrap in gnulib, however, to
@@ -42,8 +42,13 @@ export LC_ALL
 
 local_gl_dir=gl
 
+# Honor $PERL, but work even if there is none.
+PERL="${PERL-perl}"
+
 me=$0
 
+default_gnulib_url=git://git.sv.gnu.org/gnulib
+
 usage() {
   cat <<EOF
 Usage: $me [OPTION]...
@@ -73,6 +78,37 @@ contents are read as shell variables to configure the bootstrap.
 For build prerequisites, environment variables like \$AUTOCONF and \$AMTAR
 are honored.
 
+Gnulib sources can be fetched in various ways:
+
+ * If this package is in a git repository with a 'gnulib' submodule
+   configured, then that submodule is initialized and updated and sources
+   are fetched from there.  If \$GNULIB_SRCDIR is set (directly or via
+   --gnulib-srcdir) and is a git repository, then it is used as a reference.
+
+ * Otherwise, if \$GNULIB_SRCDIR is set (directly or via --gnulib-srcdir),
+   then sources are fetched from that local directory.  If it is a git
+   repository and \$GNULIB_REVISION is set, then that revision is checked
+   out.
+
+ * Otherwise, if this package is in a git repository with a 'gnulib'
+   submodule configured, then that submodule is initialized and updated and
+   sources are fetched from there.
+
+ * Otherwise, if the 'gnulib' directory does not exist, Gnulib sources are
+   cloned into that directory using git from \$GNULIB_URL, defaulting to
+   $default_gnulib_url.
+   If \$GNULIB_REVISION is set, then that revision is checked out.
+
+ * Otherwise, the existing Gnulib sources in the 'gnulib' directory are
+   used.  If it is a git repository and \$GNULIB_REVISION is set, then that
+   revision is checked out.
+
+If you maintain a package and want to pin a particular revision of the
+Gnulib sources that has been tested with your package, then there are two
+possible approaches: either configure a 'gnulib' submodule with the
+appropriate revision, or set \$GNULIB_REVISION (and if necessary
+\$GNULIB_URL) in $me.conf.
+
 Running without arguments will suffice in most cases.
 EOF
 }
@@ -126,34 +162,28 @@ bootstrap_post_import_hook() { :; }
 # Override it via your own definition in bootstrap.conf.
 bootstrap_epilogue() { :; }
 
-# The command to download all .po files for a specified domain into
-# a specified directory.  Fill in the first %s is the domain name, and
-# the second with the destination directory.  Use rsync's -L and -r
-# options because the latest/%s directory and the .po files within are
-# all symlinks.
+# The command to download all .po files for a specified domain into a
+# specified directory.  Fill in the first %s with the destination
+# directory and the second with the domain name.
 po_download_command_format=\
-"rsync --delete --exclude '*.s1' -Lrtvz \
- 'translationproject.org::tp/latest/%s/' '%s'"
-
-# Fallback for downloading .po files (if rsync fails).
-po_download_command_format2=\
-"wget --mirror -nd -q -np -A.po -P '%s' \
- http://translationproject.org/latest/%s/"
+"wget --mirror --level=1 -nd -nv -A.po -P '%s' \
+ https://translationproject.org/latest/%s/"
 
+# Prefer a non-empty tarname (4th argument of AC_INIT if given), else
+# fall back to the package name (1st argument with munging)
 extract_package_name='
-  /^AC_INIT(/{
-     /.*,.*,.*, */{
-       s///
-       s/[][]//g
-       s/)$//
+  /^AC_INIT(\[*/{
+     s///
+     /^[^,]*,[^,]*,[^,]*,[ []*\([^][ ,)]\)/{
+       s//\1/
+       s/[],)].*//
        p
        q
      }
-     s/AC_INIT(\[*//
-     s/]*,.*//
+     s/[],)].*//
      s/^GNU //
      y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/
-     s/[^A-Za-z0-9_]/-/g
+     s/[^abcdefghijklmnopqrstuvwxyz0123456789_]/-/g
      p
   }
 '
@@ -166,7 +196,15 @@ source_base=lib
 m4_base=m4
 doc_base=doc
 tests_base=tests
-gnulib_extra_files=''
+gnulib_extra_files="
+        build-aux/install-sh
+        build-aux/mdate-sh
+        build-aux/texinfo.tex
+        build-aux/depcomp
+        build-aux/config.guess
+        build-aux/config.sub
+        doc/INSTALL
+"
 
 # Additional gnulib-tool options to use.  Use "\newline" to break lines.
 gnulib_tool_option_extras=
@@ -208,12 +246,26 @@ bootstrap_sync=false
 # Use git to update gnulib sources
 use_git=true
 
+check_exists() {
+  if test "$1" = "--verbose"; then
+    ($2 --version </dev/null) >/dev/null 2>&1
+    if test $? -ge 126; then
+      # If not found, run with diagnostics as one may be
+      # presented with env variables to set to find the right version
+      ($2 --version </dev/null)
+    fi
+  else
+    ($1 --version </dev/null) >/dev/null 2>&1
+  fi
+
+  test $? -lt 126
+}
+
 # find_tool ENVVAR NAMES...
 # -------------------------
 # Search for a required program.  Use the value of ENVVAR, if set,
-# otherwise find the first of the NAMES that can be run (i.e.,
-# supports --version).  If found, set ENVVAR to the program name,
-# die otherwise.
+# otherwise find the first of the NAMES that can be run.
+# If found, set ENVVAR to the program name, die otherwise.
 #
 # FIXME: code duplication, see also gnu-web-doc-update.
 find_tool ()
@@ -223,27 +275,21 @@ find_tool ()
   find_tool_names=$@
   eval "find_tool_res=\$$find_tool_envvar"
   if test x"$find_tool_res" = x; then
-    for i
-    do
-      if ($i --version </dev/null) >/dev/null 2>&1; then
-       find_tool_res=$i
-       break
+    for i; do
+      if check_exists $i; then
+        find_tool_res=$i
+        break
       fi
     done
-  else
-    find_tool_error_prefix="\$$find_tool_envvar: "
   fi
-  test x"$find_tool_res" != x \
-    || die "one of these is required: $find_tool_names"
-  ($find_tool_res --version </dev/null) >/dev/null 2>&1 \
-    || die "${find_tool_error_prefix}cannot run $find_tool_res --version"
+  if test x"$find_tool_res" = x; then
+    warn_ "one of these is required: $find_tool_names;"
+    die   "alternatively set $find_tool_envvar to a compatible tool"
+  fi
   eval "$find_tool_envvar=\$find_tool_res"
   eval "export $find_tool_envvar"
 }
 
-# Find sha1sum, named gsha1sum on MacPorts, and shasum on Mac OS X 10.6.
-find_tool SHA1SUM sha1sum gsha1sum shasum
-
 # Override the default configuration, if necessary.
 # Make sure that bootstrap.conf is sourced from the current directory
 # if we were invoked as "sh bootstrap".
@@ -252,24 +298,18 @@ case "$0" in
   *) test -r "$0.conf" && . ./"$0.conf" ;;
 esac
 
-# Extra files from gnulib, which override files from other sources.
-test -z "${gnulib_extra_files}" && \
-  gnulib_extra_files="
-        $build_aux/install-sh
-        $build_aux/mdate-sh
-        $build_aux/texinfo.tex
-        $build_aux/depcomp
-        $build_aux/config.guess
-        $build_aux/config.sub
-        doc/INSTALL
-"
-
 if test "$vc_ignore" = auto; then
   vc_ignore=
   test -d .git && vc_ignore=.gitignore
   test -d CVS && vc_ignore="$vc_ignore .cvsignore"
 fi
 
+if test x"$gnulib_modules$gnulib_files$gnulib_extra_files" = x; then
+  use_gnulib=false
+else
+  use_gnulib=true
+fi
+
 # Translate configuration into internal form.
 
 # Parse options.
@@ -306,34 +346,34 @@ if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
   die "Bootstrapping from a non-checked-out distribution is risky."
 fi
 
-# Ensure that lines starting with ! sort last, per gitignore conventions
-# for whitelisting exceptions after a more generic blacklist pattern.
-sort_patterns() {
-  sort -u "$@" | sed '/^!/ {
-    H
-    d
-  }
-  $ {
-    P
-    x
-    s/^\n//
-  }' | sed '/^$/d'
+# Strip blank and comment lines to leave significant entries.
+gitignore_entries() {
+  sed '/^#/d; /^$/d' "$@"
 }
 
-# If $STR is not already on a line by itself in $FILE, insert it,
-# sorting the new contents of the file and replacing $FILE with the result.
-insert_sorted_if_absent() {
+# If $STR is not already on a line by itself in $FILE, insert it at the start.
+# Entries are inserted at the start of the ignore list to ensure existing
+# entries starting with ! are not overridden.  Such entries support
+# whitelisting exceptions after a more generic blacklist pattern.
+insert_if_absent() {
   file=$1
   str=$2
   test -f $file || touch $file
-  echo "$str" | sort_patterns - $file | cmp -s - $file > /dev/null \
-    || { echo "$str" | sort_patterns - $file > $file.bak \
-      && mv $file.bak $file; } \
-    || die "insert_sorted_if_absent $file $str: failed"
+  test -r $file || die "Error: failed to read ignore file: $file"
+  duplicate_entries=$(gitignore_entries $file | sort | uniq -d)
+  if [ "$duplicate_entries" ] ; then
+    die "Error: Duplicate entries in $file: " $duplicate_entries
+  fi
+  linesold=$(gitignore_entries $file | wc -l)
+  linesnew=$( { echo "$str"; cat $file; } | gitignore_entries | sort -u | wc -l)
+  if [ $linesold != $linesnew ] ; then
+    { echo "$str" | cat - $file > $file.bak && mv $file.bak $file; } \
+      || die "insert_if_absent $file $str: failed"
+  fi
 }
 
 # Adjust $PATTERN for $VC_IGNORE_FILE and insert it with
-# insert_sorted_if_absent.
+# insert_if_absent.
 insert_vc_ignore() {
   vc_ignore_file="$1"
   pattern="$2"
@@ -344,7 +384,7 @@ insert_vc_ignore() {
     # .gitignore entry.
     pattern=$(echo "$pattern" | sed s,^,/,);;
   esac
-  insert_sorted_if_absent "$vc_ignore_file" "$pattern"
+  insert_if_absent "$vc_ignore_file" "$pattern"
 }
 
 # Die if there is no AC_CONFIG_AUX_DIR($build_aux) line in configure.ac.
@@ -406,28 +446,30 @@ sort_ver() { # sort -V is not generally available
   done
 }
 
+get_version_sed='
+# Move version to start of line.
+s/.*[v ]\([0-9]\)/\1/
+
+# Skip lines that do not start with version.
+/^[0-9]/!d
+
+# Remove characters after the version.
+s/[^.a-z0-9-].*//
+
+# The first component must be digits only.
+s/^\([0-9]*\)[a-z-].*/\1/
+
+#the following essentially does s/5.005/5.5/
+s/\.0*\([1-9]\)/.\1/g
+p
+q'
+
 get_version() {
   app=$1
 
-  $app --version >/dev/null 2>&1 || return 1
+  $app --version >/dev/null 2>&1 || { $app --version; return 1; }
 
-  $app --version 2>&1 |
-  sed -n '# Move version to start of line.
-          s/.*[v ]\([0-9]\)/\1/
-
-          # Skip lines that do not start with version.
-          /^[0-9]/!d
-
-          # Remove characters after the version.
-          s/[^.a-z0-9-].*//
-
-          # The first component must be digits only.
-          s/^\([0-9]*\)[a-z-].*/\1/
-
-          #the following essentially does s/5.005/5.5/
-          s/\.0*\([1-9]\)/.\1/g
-          p
-          q'
+  $app --version 2>&1 | sed -n "$get_version_sed"
 }
 
 check_versions() {
@@ -447,6 +489,7 @@ check_versions() {
     test "$appvar" = TAR && appvar=AMTAR
     case $appvar in
         GZIP) ;; # Do not use $GZIP:  it contains gzip options.
+        PERL::*) ;; # Keep perl modules as-is
         *) eval "app=\${$appvar-$app}" ;;
     esac
 
@@ -464,12 +507,22 @@ check_versions() {
           ret=1
           continue
         } ;;
+      # Another check is for perl modules.  These can be written as
+      # e.g. perl::XML::XPath in case of XML::XPath module, etc.
+      perl::*)
+        # Extract module name
+        app="${app#perl::}"
+        if ! $PERL -m"$app" -e 'exit 0' >/dev/null 2>&1; then
+          warn_ "Error: perl module '$app' not found"
+          ret=1
+        fi
+        continue
+        ;;
     esac
     if [ "$req_ver" = "-" ]; then
       # Merely require app to exist; not all prereq apps are well-behaved
       # so we have to rely on $? rather than get_version.
-      $app --version >/dev/null 2>&1
-      if [ 126 -le $? ]; then
+      if ! check_exists --verbose $app; then
         warn_ "Error: '$app' not found"
         ret=1
       fi
@@ -502,6 +555,12 @@ print_versions() {
   # can't depend on column -t
 }
 
+# Find sha1sum, named gsha1sum on MacPorts, shasum on Mac OS X 10.6.
+# Also find the compatible sha1 utility on the BSDs
+if test x"$SKIP_PO" = x; then
+  find_tool SHA1SUM sha1sum gsha1sum shasum sha1
+fi
+
 use_libtool=0
 # We'd like to use grep -E, to see if any of LT_INIT,
 # AC_PROG_LIBTOOL, AM_PROG_LIBTOOL is used in configure.ac,
@@ -547,13 +606,21 @@ if ! printf "$buildreq" | check_versions; then
   fi
 fi
 
+# Warn the user if autom4te appears to be broken; this causes known
+# issues with at least gettext 0.18.3.
+probe=$(echo 'm4_quote([hi])' | autom4te -l M4sugar -t 'm4_quote:$%' -)
+if test "x$probe" != xhi; then
+  warn_ "WARNING: your autom4te wrapper eats stdin;"
+  warn_ "if bootstrap fails, consider upgrading your autotools"
+fi
+
 echo "$0: Bootstrapping from checked-out $package sources..."
 
 # See if we can use gnulib's git-merge-changelog merge driver.
-if test -d .git && (git --version) >/dev/null 2>/dev/null ; then
+if $use_git && test -d .git && check_exists git; then
   if git config merge.merge-changelog.driver >/dev/null ; then
     :
-  elif (git-merge-changelog --version) >/dev/null 2>/dev/null ; then
+  elif check_exists git-merge-changelog; then
     echo "$0: initializing git-merge-changelog driver"
     git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
     git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
@@ -573,83 +640,101 @@ git_modules_config () {
   test -f .gitmodules && git config --file .gitmodules "$@"
 }
 
-gnulib_path=$(git_modules_config submodule.gnulib.path)
-test -z "$gnulib_path" && gnulib_path=gnulib
-
-# Get gnulib files.
-
-case ${GNULIB_SRCDIR--} in
--)
-  if git_modules_config submodule.gnulib.url >/dev/null; then
-    echo "$0: getting gnulib files..."
-    git submodule init || exit $?
-    git submodule update || exit $?
-
-  elif [ ! -d "$gnulib_path" ]; then
-    echo "$0: getting gnulib files..."
-
-    trap cleanup_gnulib 1 2 13 15
-
-    shallow=
-    git clone -h 2>&1 | grep -- --depth > /dev/null && shallow='--depth 2'
-    git clone $shallow git://git.sv.gnu.org/gnulib "$gnulib_path" ||
-      cleanup_gnulib
-
-    trap - 1 2 13 15
+if $use_gnulib; then
+  if $use_git; then
+    gnulib_path=$(git_modules_config submodule.gnulib.path)
+    test -z "$gnulib_path" && gnulib_path=gnulib
   fi
-  GNULIB_SRCDIR=$gnulib_path
-  ;;
-*)
-  # Use GNULIB_SRCDIR as a reference.
-  if test -d "$GNULIB_SRCDIR"/.git && \
-        git_modules_config submodule.gnulib.url >/dev/null; then
-    echo "$0: getting gnulib files..."
-    if git submodule -h|grep -- --reference > /dev/null; then
-      # Prefer the one-liner available in git 1.6.4 or newer.
-      git submodule update --init --reference "$GNULIB_SRCDIR" \
-        "$gnulib_path" || exit $?
-    else
-      # This fallback allows at least git 1.5.5.
-      if test -f "$gnulib_path"/gnulib-tool; then
-        # Since file already exists, assume submodule init already complete.
-        git submodule update || exit $?
-      else
-        # Older git can't clone into an empty directory.
-        rmdir "$gnulib_path" 2>/dev/null
-        git clone --reference "$GNULIB_SRCDIR" \
-          "$(git_modules_config submodule.gnulib.url)" "$gnulib_path" \
-          && git submodule init && git submodule update \
-          || exit $?
+
+  # Get gnulib files.  Populate $GNULIB_SRCDIR, possibly updating a
+  # submodule, for use in the rest of the script.
+
+  case ${GNULIB_SRCDIR--} in
+  -)
+    # Note that $use_git is necessarily true in this case.
+    if git_modules_config submodule.gnulib.url >/dev/null; then
+      echo "$0: getting gnulib files..."
+      git submodule init -- "$gnulib_path" || exit $?
+      git submodule update -- "$gnulib_path" || exit $?
+
+    elif [ ! -d "$gnulib_path" ]; then
+      echo "$0: getting gnulib files..."
+
+      trap cleanup_gnulib 1 2 13 15
+
+      shallow=
+      if test -z "$GNULIB_REVISION"; then
+        git clone -h 2>&1 | grep -- --depth > /dev/null && shallow='--depth 2'
       fi
+      git clone $shallow ${GNULIB_URL:-$default_gnulib_url} "$gnulib_path" \
+        || cleanup_gnulib
+
+      trap - 1 2 13 15
     fi
     GNULIB_SRCDIR=$gnulib_path
+    ;;
+  *)
+    # Use GNULIB_SRCDIR directly or as a reference.
+    if $use_git && test -d "$GNULIB_SRCDIR"/.git && \
+          git_modules_config submodule.gnulib.url >/dev/null; then
+      echo "$0: getting gnulib files..."
+      if git submodule -h|grep -- --reference > /dev/null; then
+        # Prefer the one-liner available in git 1.6.4 or newer.
+        git submodule update --init --reference "$GNULIB_SRCDIR" \
+          "$gnulib_path" || exit $?
+      else
+        # This fallback allows at least git 1.5.5.
+        if test -f "$gnulib_path"/gnulib-tool; then
+          # Since file already exists, assume submodule init already complete.
+          git submodule update -- "$gnulib_path" || exit $?
+        else
+          # Older git can't clone into an empty directory.
+          rmdir "$gnulib_path" 2>/dev/null
+          git clone --reference "$GNULIB_SRCDIR" \
+            "$(git_modules_config submodule.gnulib.url)" "$gnulib_path" \
+            && git submodule init -- "$gnulib_path" \
+            && git submodule update -- "$gnulib_path" \
+            || exit $?
+        fi
+      fi
+      GNULIB_SRCDIR=$gnulib_path
+    fi
+    ;;
+  esac
+
+  if test -d "$GNULIB_SRCDIR"/.git && test -n "$GNULIB_REVISION" \
+     && ! git_modules_config submodule.gnulib.url >/dev/null; then
+    (cd "$GNULIB_SRCDIR" && git checkout "$GNULIB_REVISION") || cleanup_gnulib
   fi
-  ;;
-esac
 
-if $bootstrap_sync; then
-  cmp -s "$0" "$GNULIB_SRCDIR/build-aux/bootstrap" || {
-    echo "$0: updating bootstrap and restarting..."
-    exec sh -c \
-      'cp "$1" "$2" && shift && exec "${CONFIG_SHELL-/bin/sh}" "$@"' \
-      -- "$GNULIB_SRCDIR/build-aux/bootstrap" \
-      "$0" "$@" --no-bootstrap-sync
-  }
+  # $GNULIB_SRCDIR now points to the version of gnulib to use, and
+  # we no longer need to use git or $gnulib_path below here.
+
+  if $bootstrap_sync; then
+    cmp -s "$0" "$GNULIB_SRCDIR/build-aux/bootstrap" || {
+      echo "$0: updating bootstrap and restarting..."
+      case $(sh -c 'echo "$1"' -- a) in
+        a) ignored=--;;
+        *) ignored=ignored;;
+      esac
+      exec sh -c \
+        'cp "$1" "$2" && shift && exec "${CONFIG_SHELL-/bin/sh}" "$@"' \
+        $ignored "$GNULIB_SRCDIR/build-aux/bootstrap" \
+        "$0" "$@" --no-bootstrap-sync
+    }
+  fi
+
+  gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
+  <$gnulib_tool || exit $?
 fi
 
-gnulib_tool=$GNULIB_SRCDIR/gnulib-tool
-<$gnulib_tool || exit $?
-
 # Get translations.
 
 download_po_files() {
   subdir=$1
   domain=$2
   echo "$me: getting translations into $subdir for $domain..."
-  cmd=$(printf "$po_download_command_format" "$domain" "$subdir")
-  eval "$cmd" && return
-  # Fallback to HTTP.
-  cmd=$(printf "$po_download_command_format2" "$subdir" "$domain")
+  cmd=$(printf "$po_download_command_format" "$subdir" "$domain")
   eval "$cmd"
 }
 
@@ -680,11 +765,10 @@ update_po_files() {
     cksum_file="$ref_po_dir/$po.s1"
     if ! test -f "$cksum_file" ||
         ! test -f "$po_dir/$po.po" ||
-        ! $SHA1SUM -c --status "$cksum_file" \
-            < "$new_po" > /dev/null; then
+        ! $SHA1SUM -c "$cksum_file" < "$new_po" > /dev/null 2>&1; then
       echo "$me: updated $po_dir/$po.po..."
       cp "$new_po" "$po_dir/$po.po" \
-          && $SHA1SUM < "$new_po" > "$cksum_file"
+          && $SHA1SUM < "$new_po" > "$cksum_file" || return
     fi
   done
 }
@@ -740,9 +824,9 @@ symlink_to_dir()
       # Leave any existing symlink alone, if it already points to the source,
       # so that broken build tools that care about symlink times
       # aren't confused into doing unnecessary builds.  Conversely, if the
-      # existing symlink's time stamp is older than the source, make it afresh,
+      # existing symlink's timestamp is older than the source, make it afresh,
       # so that broken tools aren't confused into skipping needed builds.  See
-      # <http://lists.gnu.org/archive/html/bug-gnulib/2011-05/msg00326.html>.
+      # <https://lists.gnu.org/r/bug-gnulib/2011-05/msg00326.html>.
       test -h "$dst" &&
       src_ls=$(ls -diL "$src" 2>/dev/null) && set $src_ls && src_i=$1 &&
       dst_ls=$(ls -diL "$dst" 2>/dev/null) && set $dst_ls && dst_i=$1 &&
@@ -848,35 +932,47 @@ fi
 
 # Import from gnulib.
 
-gnulib_tool_options="\
- --import\
- --no-changelog\
- --aux-dir $build_aux\
- --doc-base $doc_base\
- --lib $gnulib_name\
- --m4-base $m4_base/\
- --source-base $source_base/\
- --tests-base $tests_base\
- --local-dir $local_gl_dir\
- $gnulib_tool_option_extras\
-"
-if test $use_libtool = 1; then
-  case "$gnulib_tool_options " in
-    *' --libtool '*) ;;
-    *) gnulib_tool_options="$gnulib_tool_options --libtool" ;;
-  esac
-fi
-echo "$0: $gnulib_tool $gnulib_tool_options --import ..."
-$gnulib_tool $gnulib_tool_options --import $gnulib_modules &&
+if $use_gnulib; then
+  gnulib_tool_options="\
+   --no-changelog\
+   --aux-dir=$build_aux\
+   --doc-base=$doc_base\
+   --lib=$gnulib_name\
+   --m4-base=$m4_base/\
+   --source-base=$source_base/\
+   --tests-base=$tests_base\
+   --local-dir=$local_gl_dir\
+   $gnulib_tool_option_extras\
+  "
+  if test $use_libtool = 1; then
+    case "$gnulib_tool_options " in
+      *' --libtool '*) ;;
+      *) gnulib_tool_options="$gnulib_tool_options --libtool" ;;
+    esac
+  fi
+  echo "$0: $gnulib_tool $gnulib_tool_options --import ..."
+  $gnulib_tool $gnulib_tool_options --import $gnulib_modules \
+    || die "gnulib-tool failed"
 
-for file in $gnulib_files; do
-  symlink_to_dir "$GNULIB_SRCDIR" $file \
-    || die "failed to symlink $file"
-done
+  for file in $gnulib_files; do
+    symlink_to_dir "$GNULIB_SRCDIR" $file \
+      || die "failed to symlink $file"
+  done
+fi
 
 bootstrap_post_import_hook \
   || die "bootstrap_post_import_hook failed"
 
+# Don't proceed if there are uninitialized submodules.  In particular,
+# the next step will remove dangling links, which might be links into
+# uninitialized submodules.
+#
+# Uninitialized submodules are listed with an initial dash.
+if $use_git && git submodule | grep '^-' >/dev/null; then
+  die "some git submodules are not initialized. "     \
+      "Run 'git submodule update --init' and bootstrap again."
+fi
+
 # Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
 # gnulib-populated directories.  Such .m4 files would cause aclocal to fail.
 # The following requires GNU find 4.2.3 or newer.  Considering the usual
@@ -889,20 +985,21 @@ find "$m4_base" "$source_base" \
   -depth \( -name '*.m4' -o -name '*.[ch]' \) \
   -type l -xtype l -delete > /dev/null 2>&1
 
+# Invoke autoreconf with --force --install to ensure upgrades of tools
+# such as ylwrap.
+AUTORECONFFLAGS="--verbose --install --force -I $m4_base $ACLOCAL_FLAGS"
+
 # Some systems (RHEL 5) are using ancient autotools, for which the
 # --no-recursive option had not been invented.  Detect that lack and
 # omit the option when it's not supported.  FIXME in 2017: remove this
 # hack when RHEL 5 autotools are updated, or when they become irrelevant.
-no_recursive=
 case $($AUTORECONF --help) in
-  *--no-recursive*) no_recursive=--no-recursive;;
+  *--no-recursive*) AUTORECONFFLAGS="$AUTORECONFFLAGS --no-recursive";;
 esac
 
 # Tell autoreconf not to invoke autopoint or libtoolize; they were run above.
-echo "running: AUTOPOINT=true LIBTOOLIZE=true " \
-    "$AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS"
-AUTOPOINT=true LIBTOOLIZE=true \
-    $AUTORECONF --verbose --install $no_recursive -I $m4_base $ACLOCAL_FLAGS \
+echo "running: AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS"
+AUTOPOINT=true LIBTOOLIZE=true $AUTORECONF $AUTORECONFFLAGS \
   || die "autoreconf failed"
 
 # Get some extra files from gnulib, overriding existing files.
@@ -968,9 +1065,9 @@ bootstrap_epilogue
 echo "$0: done.  Now you can run './configure'."
 
 # Local variables:
-# eval: (add-hook 'write-file-hooks 'time-stamp)
+# eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-time-zone: "UTC"
+# time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:

bootstrap.conf

@@ -1,6 +1,6 @@
 # Bootstrap configuration.
 
-# Copyright (C) 2006-2012 Free Software Foundation, Inc.
+# Copyright (C) 2006-2015, 2018-2020 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -17,63 +17,71 @@
 
 # gnulib modules used by this package.
 gnulib_modules='
-  argmatch assert calloc-posix close closeout config-h c-strcase
+  argmatch array-list assert assure
+  bitsetv
+  calloc-posix close closeout config-h c-strcase
   configmake
   dirname
-  error extensions fdl fopen-safer getopt-gnu
-  gettext git-version-gen gitlog-to-changelog
-  gpl-3.0 hash inttypes isnan javacomp-script
-  javaexec-script ldexpl malloc-gnu mbschr mbsrchr
-  mbswidth
+  error extensions
+  fdl fopen-safer fstrcmp
+  getopt-gnu
+  gettext-h git-version-gen gitlog-to-changelog
+  gpl-3.0 intprops inttypes isnan javacomp-script
+  javaexec-script
+  ldexpl
+  libtextstyle-optional
+  malloc-gnu
+  mbfile mbswidth
+  non-recursive-gnulib-prefix-hack
   obstack
   obstack-printf
   perror progname
   quote quotearg
+  readline
   readme-release
   realloc-posix
-  spawn-pipe stdbool stpcpy strdup-posix strerror strtoul strverscmp
-  unistd unistd-safer unlocked-io update-copyright unsetenv verify
+  relocatable-prog relocatable-script
+  rename
+  spawn-pipe stdbool stpcpy strdup-posix strerror strverscmp
+  timevar
+  unistd unistd-safer unlink unlocked-io
+  update-copyright unsetenv verify
   warnings
-  xalloc xalloc-die xmemdup0 xstrndup
+  winsz-ioctl
+  winsz-termios
+  xalloc
+  xalloc-die
+  xconcat-filename
+  xhash
+  xlist
+  xmemdup0
+  xstrndup
 
   fprintf-posix printf-posix snprintf-posix sprintf-posix
   vsnprintf-posix vsprintf-posix
 '
 
+checkout_only_file=README-hacking.md
+
 # Additional xgettext options to use.  Use "\\\newline" to break lines.
 XGETTEXT_OPTIONS=$XGETTEXT_OPTIONS'\\\
  --from-code=UTF-8\\\
  --flag=asprintf:2:c-format\\\
- --flag=complain:1:c-format --flag=complain_at:2:c-format\\\
- --flag=fatal:1:c-format --flag=fatal_at:2:c-format\\\
- --flag=warn:1:c-format  --flag=warn_at:2:c-format\\\
+ --flag=complain:3:c-format\\\
+ --flag=complain_indent:4:c-format\\\
  --flag=unexpected_end:2:c-format\\\
 '
 XGETTEXT_OPTIONS_RUNTIME=$XGETTEXT_OPTIONS'\\\
  --keyword=YY_ \\\
 '
 
-# Gettext supplies these files, but we don't need them since
-# we don't have an intl subdirectory.
-excluded_files='
-    m4/glibc2.m4
-    m4/intdiv0.m4
-    m4/intl.m4
-    m4/intldir.m4
-    m4/intmax.m4
-    m4/lcmessage.m4
-    m4/lock.m4
-    m4/longdouble.m4
-    m4/signed.m4
-    m4/uintmax_t.m4
-    m4/ulonglong.m4
-    m4/visibility.m4
-'
-
-gnulib_tool_option_extras='--symlink --makefile-name=gnulib.mk'
+gnulib_tool_option_extras='--symlink --conditional-dependencies --makefile-name=gnulib.mk --po-base=gnulib-po --po-domain=bison'
 
 bootstrap_post_import_hook()
 {
+  # Massage lib/gnulib.mk before using it later in the bootstrapping process.
+  build-aux/prefix-gnulib-mk --lib-name="$gnulib_name" "lib/$gnulib_mk"
+
   # Ensure that ChangeLog exists, for automake.
   test -f ChangeLog || touch ChangeLog
 }
@@ -85,6 +93,13 @@ bootstrap_epilogue()
   touch src/parse-gram.[ch]
 
   perl -pi -e "s/\@PACKAGE\@/$package/g" README-release
+
+  # Bison currently uses Gettext 0.19, but the gnulib-po module
+  # imports files from more recent versions of Gettext that are not
+  # yet available widely enough (e.g., not in bionic, used by the CI).
+  # Work around this.  Don't use autopoint, which sends some other
+  # files in the past.
+  cp po/Makefile.in.in gnulib-po
 }
 
 # Keep our bootstrap script in sync with gnulib's.  If we ever need to

build-aux/.gitignore

@@ -1,11 +1,8 @@
-/Makefile
-/Makefile.in
 /announce-gen
-/arg-nonnull.h
-/c++defs.h
 /compile
 /config.guess
 /config.rpath
+/config.rpath~
 /config.sub
 /depcomp
 /do-release-commit-and-tag
@@ -17,12 +14,17 @@
 /install-sh
 /javacomp.sh.in
 /javaexec.sh.in
-/link-warning.h
 /mdate-sh
 /missing
+/prefix-gnulib-mk
+/test-driver
 /texinfo.tex
 /update-copyright
 /useless-if-before-free
 /vc-list-files
-/warn-on-use.h
 /ylwrap
+/config.libpath
+/install-reloc
+/reloc-ldflags
+/relocatable.sh.in
+/libtool-reloc

build-aux/Darwin.valgrind

@@ -1,4 +1,4 @@
-# Copyright (C) 2012 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

build-aux/Linux.valgrind

@@ -0,0 +1,61 @@
+# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Valgrind suppression file for Bison.
+
+# Travis Trusty, 2018-09-07.
+{
+   libstdcxx_init
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   obj:/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.25
+   fun:call_init.part.0
+   fun:call_init
+   fun:_dl_init
+   obj:/lib/x86_64-linux-gnu/ld-2.19.so
+}
+
+# Linux prague 4.1.2-2-ARCH #1 SMP PREEMPT Wed Jul 15 08:30:32 UTC 2015
+# x86_64 GNU/Linux
+{
+   Probably exception handling from G++ 5.1.
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   fun:pool
+   fun:__static_initialization_and_destruction_0
+   fun:_GLOBAL__sub_I_eh_alloc.cc
+   fun:call_init.part.0
+   fun:_dl_init
+   obj:/usr/lib/ld-2.21.so
+}
+
+# Linux seattle 2.6.32-5-amd64 #1 SMP Thu Mar 22 17:26:33 UTC 2012
+# x86_64 GNU/Linux
+{
+   index
+   Memcheck:Cond
+   fun:index
+   fun:expand_dynamic_string_token
+   fun:_dl_map_object
+   fun:map_doit
+   fun:_dl_catch_error
+   fun:do_preload
+   fun:dl_main
+   fun:_dl_sysdep_start
+   fun:_dl_start
+   obj:/lib/ld-2.11.3.so
+}

build-aux/cross-options.pl

@@ -1,5 +1,24 @@
 #! /usr/bin/env perl
 
+# Generate a release announcement message.
+
+# Copyright (C) 2007-2020 Free Software Foundation, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+# Written by Akim Demaille.
+
 use warnings;
 use 5.005;
 use strict;
@@ -12,68 +31,74 @@ while (<STDIN>)
 {
     if (/^\s*             # Initial spaces.
         (?:(-\w),\s+)?    # $1: $short: Possible short option.
-        (--[-\w]+)        # $2: $long:  Long option.
+        (--[-\w]+)        # $2: $long:  Mandatory long option.
         (\[?)             # $3: $opt:   '[' iff the argument is optional.
         (?:=(\S+))?       # $4: $arg:   Possible argument name.
         \s                # Spaces.
         /x)
     {
-	my ($short, $long, $opt, $arg) = ($1, $2, $3, $4);
-	$short = '' if ! defined $short;
-	$short = '-d' if $long eq '--defines' && ! $short;
-	my $dir = '%' . substr($long, 2);
-	if (index ($scanner, "\"$dir\"") < 0)
-	{
-	  if ($long eq '--force-define') { $dir = '%define'; }
-	  else { $dir = ''; }
-	}
-	if ($arg)
-	{
+        my ($short, $long, $opt, $arg) = ($1, $2, $3, $4);
+        $short = '' if ! defined $short;
+        $short = '-d' if $long eq '--defines' && ! $short;
+        my $dir = '%' . substr($long, 2);
+        if (index ($scanner, "\"$dir\"") < 0)
+        {
+          if ($long eq '--force-define') { $dir = '%define'; }
+          else { $dir = ''; }
+        }
+        if ($arg)
+        {
             # if $opt, $arg contains the closing ].
             substr ($arg, -1) = ''
                 if $opt eq '[';
-	    $arg =~ s/^=//;
             $arg = lc ($arg);
-	    my $dir_arg = $arg;
-            # If the argument is compite (e.g., for --define[=NAME[=VALUE]]),
+            my $dir_arg = $arg;
+            # If the argument is complete (e.g., for --define[=NAME[=VALUE]]),
             # put each word in @var, to build @var{name}[=@var{value}], not
             # @var{name[=value]}].
-	    $arg =~ s/(\w+)/\@var{$1}/g;
-	    my $long_arg = "=$arg";
-	    if ($opt eq '[') {
-	      $long_arg = "[$long_arg]";
-	      $arg = "[$arg]";
-	    }
-	    # For arguments of directives: this only works if all arguments
-	    # are strings and have the same syntax as on the command line.
-	    if ($dir_arg eq 'name[=value]')
-	    {
-		$dir_arg = '@var{name} ["@var{value}"]';
-	    }
-	    else
-	    {
-		$dir_arg =~ s/(\w+)/\@var{"$1"}/g;
-		$dir_arg = '[' . $dir_arg . ']'
-		    if $opt eq '[';
-	    }
-	    $long = "$long$long_arg";
-	    $short = "$short $arg" if $short && $short ne '-d';
-	    $dir = "$dir $dir_arg" if $dir;
-	}
-	$option{$long} = $short;
-	$directive{$long} = $dir;
+            $arg =~ s/(\w+)/\@var{$1}/g;
+            my $long_arg = "=$arg";
+            if ($opt eq '[') {
+              $long_arg = "[$long_arg]";
+              $arg = "[$arg]";
+            }
+            # For arguments of directives: this only works if all arguments
+            # are strings and have the same syntax as on the command line.
+            if ($dir_arg eq 'name[=value]')
+            {
+                # -D/-F do not add quotes to the argument.
+                $dir_arg =
+                    $dir eq "%define"
+                    ? '@var{name} [@var{value}]'
+                    : '@var{name} ["@var{value}"]';
+            }
+            else
+            {
+                $dir_arg =~ s/(\w+)/\@var{"$1"}/g;
+                $dir_arg = '[' . $dir_arg . ']'
+                    if $opt eq '[';
+            }
+            $long = "$long$long_arg";
+            $short = "$short $arg" if $short && $short ne '-d';
+            $dir = "$dir $dir_arg" if $dir;
+        }
+        $option{$long} = $short;
+        $directive{$long} = $dir;
     }
 }
 
 my $sep = '';
 foreach my $long (sort keys %option)
 {
-    # Avoid trailing spaces.
-    print $sep;
-    $sep = "\n";
-    print '@item @option{', $long, "}\n\@tab";
-    print ' @option{', $option{$long}, '}' if $option{$long};
-    print "\n\@tab";
-    print ' @code{', $directive{$long}, '}' if $directive{$long};
-    print "\n";
+    # Couldn't find a means to escape @ in the format (for @item, @tab), so
+    # pass it as a literal to print.
+format STDOUT =
+@item @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @tab @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @tab @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
+{
+  '@', '@option{' . $long . '}',
+  '@', $option{$long} ? ('@option{' . $option{$long} . '}') : '',
+  '@', $directive{$long} ? ('@code{' . $directive{$long} . '}') : ''
+}
+.
+    write;
 }

build-aux/git-log-fix

@@ -1,3 +1,11 @@
 # This file is expected to be used via gitlog-to-changelog's --amend=FILE
 # option.  It specifies what changes to make to each given SHA1's commit
 # log and metadata, using Perl-eval'able expressions.
+
+975bb564319aa4f4204c48aba265757ba207a80f
+s/Edligner/Edlinger/;
+
+0db2648930e3b6c376a539aabe368aade83ee29a
+s/--flags/--feature/;
+s/flag_flag/feature_flag/;
+s/\bflag\b/feature/;

build-aux/install-icc.sh

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+# Install Intel Parallel Studio on Travis CI
+# https://github.com/nemequ/icc-travis
+#
+# Originally written for Squash <https://github.com/quixdb/squash> by
+# Evan Nemerson.  For documentation, bug reports, support requests,
+# etc. please use <https://github.com/nemequ/icc-travis>.
+#
+# To the extent possible under law, the author(s) of this script have
+# waived all copyright and related or neighboring rights to this work.
+# See <https://creativecommons.org/publicdomain/zero/1.0/> for
+# details.
+
+# Tools - Not very useful in non-interactive mode.
+COMPONENTS_VTUNE="intel-vtune-amplifier-xe-2016-cli__x86_64;intel-vtune-amplifier-xe-2016-common__noarch;intel-vtune-amplifier-xe-2016-cli-common__noarch;intel-vtune-amplifier-xe-2016-collector-64linux__x86_64;intel-vtune-amplifier-xe-2016-sep__noarch;intel-vtune-amplifier-xe-2016-gui-common__noarch;intel-vtune-amplifier-xe-2016-gui__x86_64;intel-vtune-amplifier-xe-2016-common-pset__noarch"
+COMPONENTS_INSPECTOR="intel-inspector-xe-2016-cli__x86_64;intel-inspector-xe-2016-cli-common__noarch;intel-inspector-xe-2016-gui-common__noarch;intel-inspector-xe-2016-gui__x86_64;intel-inspector-xe-2016-cli-pset__noarch"
+COMPONENTS_ADVISOR="intel-advisor-xe-2016-cli__x86_64;intel-advisor-xe-2016-cli-common__noarch;intel-advisor-xe-2016-gui-common__noarch;intel-advisor-xe-2016-gui__x86_64;intel-advisor-xe-2016-cli-pset__noarch"
+COMPONENTS_GDB="intel-gdb-gt__x86_64;intel-gdb-gt-src__noarch;intel-gdb-gt-libelfdwarf__x86_64;intel-gdb-gt-devel__x86_64;intel-gdb-gt-common__noarch;intel-gdb-ps-cdt__x86_64;intel-gdb-ps-cdt-source__x86_64;intel-gdb-ps-mic__x86_64;intel-gdb-ps-mpm__x86_64;intel-gdb__x86_64;intel-gdb-source__noarch;intel-gdb-python-source__noarch;intel-gdb-common__noarch;intel-gdb-ps-common__noarch"
+
+# Parallel libraries
+COMPONENTS_MPI="intel-mpi-rt-core__x86_64;intel-mpi-rt-mic__x86_64;intel-mpi-sdk-core__x86_64;intel-mpi-sdk-mic__x86_64;intel-mpi-psxe__x86_64;intel-mpi-rt-psxe__x86_64"
+COMPONENTS_TBB="intel-tbb-libs__noarch;intel-mkl-ps-tbb__x86_64;intel-mkl-ps-tbb-devel__x86_64;intel-mkl-ps-tbb-mic__x86_64;intel-mkl-ps-tbb-mic-devel__x86_64;intel-tbb-source__noarch;intel-tbb-devel__noarch;intel-tbb-common__noarch;intel-tbb-ps-common__noarch;intel-tbb-psxe__noarch"
+COMPONENTS_MKL="intel-mkl__x86_64;intel-mkl-ps__x86_64;intel-mkl-common__noarch;intel-mkl-ps-common__noarch;intel-mkl-devel__x86_64;intel-mkl-ps-mic-devel__x86_64;intel-mkl-ps-f95-devel__x86_64;intel-mkl-gnu-devel__x86_64;intel-mkl-ps-gnu-devel__x86_64;intel-mkl-ps-pgi-devel__x86_64;intel-mkl-sp2dp-devel__x86_64;intel-mkl-ps-cluster-devel__x86_64;intel-mkl-ps-cluster-common__noarch;intel-mkl-ps-f95-common__noarch;intel-mkl-ps-cluster__x86_64;intel-mkl-gnu__x86_64;intel-mkl-ps-gnu__x86_64;intel-mkl-ps-pgi__x86_64;intel-mkl-sp2dp__x86_64;intel-mkl-ps-mic__x86_64;intel-mkl-ps-tbb__x86_64;intel-mkl-ps-tbb-devel__x86_64;intel-mkl-ps-tbb-mic__x86_64;intel-mkl-ps-tbb-mic-devel__x86_64;intel-mkl-psxe__noarch"
+COMPONENTS_IPP="intel-ipp-l-common__noarch;intel-ipp-l-ps-common__noarch;intel-ipp-l-st__x86_64;intel-ipp-l-mt__x86_64;intel-ipp-l-st-devel__x86_64;intel-ipp-l-ps-st-devel__x86_64;intel-ipp-l-mt-devel__x86_64;intel-ipp-psxe__noarch"
+COMPONENTS_IPP_CRYPTO="intel-crypto-ipp-st-devel__x86_64;intel-crypto-ipp-ps-st-devel__x86_64;intel-crypto-ipp-st__x86_64;intel-crypto-ipp-mt-devel__x86_64;intel-crypto-ipp-mt__x86_64;intel-crypto-ipp-ss-st-devel__x86_64;intel-crypto-ipp-common__noarch"
+COMPONENTS_DAAL="intel-daal__x86_64;intel-daal-common__noarch"
+
+# Compilers
+COMPONENTS_OPENMP="intel-openmp-l-all__x86_64;intel-openmp-l-ps-mic__x86_64;intel-openmp-l-ps__x86_64;intel-openmp-l-ps-ss__x86_64;intel-openmp-l-all-devel__x86_64;intel-openmp-l-ps-mic-devel__x86_64;intel-openmp-l-ps-devel__x86_64;intel-openmp-l-ps-ss-devel__x86_64"
+COMPONENTS_COMPILER_COMMON="intel-comp-l-all-vars__noarch;intel-comp-l-all-common;intel-comp-l-ps-common;intel-comp-l-all-devel;intel-comp-l-ps-ss-devel;intel-comp-l-ps-ss-wrapper;intel-comp-l-all-devel;intel-comp-l-ps-devel__x86_64;intel-comp-l-ps-ss-devel__x86_64;intel-psf-intel__x86_64;intel-icsxe-pset;intel-ipsf__noarch;intel-ccompxe__noarch;${COMPONENTS_OPENMP}"
+COMPONENTS_IFORT="intel-ifort-l-ps__x86_64;intel-ifort-l-ps-vars__noarch;intel-ifort-l-ps-common__noarch;intel-ifort-l-ps-devel__x86_64;${COMPONENTS_COMPILER_COMMON}"
+COMPONENTS_ICC="intel-icc-l-all__x86_64;intel-icc-l-ps-ss__x86_64;intel-icc-l-all-vars__noarch;intel-icc-l-all-common__noarch;intel-icc-l-ps-common__noarch;intel-icc-l-all-devel__x86_64;intel-icc-l-ps-devel__x86_64;intel-icc-l-ps-ss-devel__x86_64;${COMPONENTS_COMPILER_COMMON}"
+
+DESTINATION="${HOME}/intel"
+TEMPORARY_FILES="/tmp"
+PHONE_INTEL="no"
+COMPONENTS=""
+
+add_components() {
+    if [ ! -z "${COMPONENTS}" ]; then
+	COMPONENTS="${COMPONENTS};$1"
+    else
+	COMPONENTS="$1"
+    fi
+}
+
+while [ $# != 0 ]; do
+    case "$1" in
+	"--dest")
+	    DESTINATION="$(realpath "$2")"; shift
+	    ;;
+	"--tmpdir")
+	    TEMPORARY_FILES="$2"; shift
+	    ;;
+	"--components")
+	    shift
+	    OLD_IFS="${IFS}"
+	    IFS=","
+	    for component in $1; do
+		case "$component" in
+		    "icc")
+			add_components "${COMPONENTS_ICC}"
+		        ;;
+		    "mpi")
+			add_components "${COMPONENTS_MPI}"
+			;;
+		    "vtune")
+			add_components "${COMPONENTS_VTUNE}"
+			;;
+		    "inspector")
+			add_components "${COMPONENTS_INSPECTOR}"
+			;;
+		    "advisor")
+			add_components "${COMPONENTS_ADVISOR}"
+			;;
+		    "tbb")
+			add_components "${COMPONENTS_TBB}"
+			;;
+		    "ifort")
+			add_components "${COMPONENTS_IFORT}"
+			;;
+		    "mkl")
+			add_components "${COMPONENTS_MKL}"
+			;;
+		    "openmp")
+			# Noop, here for compatability.  OpenMP is installed with icc and ifort now.
+			;;
+		    "ipp")
+			add_components "${COMPONENTS_IPP}"
+			;;
+		    "ipp-crypto")
+			add_components "${COMPONENTS_IPP_CRYPTO}"
+			;;
+		    "gdb")
+			add_components "${COMPONENTS_GDB}"
+			;;
+		    "daal")
+			add_components "${COMPONENTS_DAAL}"
+			;;
+		    *)
+			echo "Unknown component '$component'"
+			exit 1
+			;;
+		esac
+	    done
+	    IFS="${OLD_IFS}"
+	    ;;
+	*)
+	    echo "Unrecognized argument '$1'"
+	    exit 1
+	    ;;
+    esac
+    shift
+done
+
+if [ -z "${COMPONENTS}" ]; then
+    COMPONENTS="${COMPONENTS_ICC}"
+fi
+
+INSTALLER_SCRIPT="parallel_studio_xe_2016_update3_online.sh"
+INSTALLER="${TEMPORARY_FILES}/${INSTALLER_SCRIPT}"
+INSTALLER_URL="http://registrationcenter-download.intel.com/akdlm/irc_nas/9061/${INSTALLER_SCRIPT}"
+SILENT_CFG="${TEMPORARY_FILES}/silent.cfg"
+SUCCESS_INDICATOR="${TEMPORARY_FILES}/icc-travis-success"
+
+if [ ! -e "${TEMPORARY_FILES}" ]; then
+    echo "${TEMPORARY_FILES} does not exist, creating..."
+    mkdir -p "${TEMPORARY_FILES}" || (sudo mkdir -p "${TEMPORARY_FILES}" && sudo chown -R "${USER}:${USER}" "${TEMPORARY_FILES}")
+fi
+
+if [ ! -e "${DESTINATION}" ]; then
+    echo "${DESTINATION} does not exist, creating..."
+    mkdir -p "${DESTINATION}" || (sudo mkdir -p "${DESTINATION}" && sudo chown -R "${USER}:${USER}" "${DESTINATION}")
+fi
+
+if [ ! -e "${INSTALLER}" ]; then
+	wget -O "${INSTALLER}" "${INSTALLER_URL}" || exit 1
+fi
+chmod u+x "${INSTALLER}"
+
+# See https://software.intel.com/en-us/articles/intel-composer-xe-2015-silent-installation-guide
+echo "# Generated silent configuration file" > "${SILENT_CFG}"
+echo "ACCEPT_EULA=accept" >> "${SILENT_CFG}"
+echo "INSTALL_MODE=NONRPM" >> "${SILENT_CFG}"
+echo "CONTINUE_WITH_OPTIONAL_ERROR=yes" >> "${SILENT_CFG}"
+echo "PSET_INSTALL_DIR=${DESTINATION}" >> "${SILENT_CFG}"
+echo "CONTINUE_WITH_INSTALLDIR_OVERWRITE=yes" >> "${SILENT_CFG}"
+echo "COMPONENTS=${COMPONENTS}" >> "${SILENT_CFG}"
+echo "PSET_MODE=install" >> "${SILENT_CFG}"
+echo "PHONEHOME_SEND_USAGE_DATA=${PHONE_INTEL}" >> "${SILENT_CFG}"
+if [ "x" != "x${INTEL_SERIAL_NUMBER}" ]; then
+    echo "ACTIVATION_SERIAL_NUMBER=${INTEL_SERIAL_NUMBER}" >> "${SILENT_CFG}"
+    echo "ACTIVATION_TYPE=serial_number" >> "${SILENT_CFG}"
+else
+    echo "ACTIVATION_TYPE=trial_lic" >> "${SILENT_CFG}"
+fi
+
+attempt=1;
+while [ $attempt -le 3 ]; do
+    if [ ! -e "${TEMPORARY_FILES}/parallel-studio-install-data" ]; then
+	mkdir -p "${TEMPORARY_FILES}/parallel-studio-install-data" || (sudo mkdir -p "${TEMPORARY_FILES}/parallel-studio-install-data" && sudo chown -R "${USER}:${USER}" "${TEMPORARY_FILES}")
+    fi
+
+    ("${INSTALLER}" \
+	 -t "${TEMPORARY_FILES}/parallel-studio-install-data" \
+	 -s "${SILENT_CFG}" \
+	 --cli-mode \
+	 --user-mode && \
+	 touch "${SUCCESS_INDICATOR}") &
+
+    # So Travis doesn't die in case of a long download/installation.
+    #
+    # NOTE: a watched script never terminates.
+    elapsed=0;
+    while kill -0 $! 2>/dev/null; do
+	sleep 1
+	elapsed=$(expr $elapsed + 1)
+	if [ $(expr $elapsed % 60) -eq 0 ]; then
+	    mins_elapsed=$(expr $elapsed / 60)
+	    if [ $mins_elapsed = 1 ]; then
+		minute_string="minute"
+	    else
+		minute_string="minutes"
+	    fi
+	    echo "Still running... (about $(expr $elapsed / 60) ${minute_string} so far)."
+	fi
+    done
+
+    if [ ! -e "${SUCCESS_INDICATOR}" ]; then
+	echo "Installation failed."
+	exit 1
+    fi
+
+    if [ ! -e "${DESTINATION}/bin/compilervars.sh" ]; then
+	# Sometimes the installer returns successfully without actually
+	# installing anything.  Let's try again…
+	echo "Installation attempt #${attempt} completed, but unable to find compilervars.sh."
+	find "${DESTINATION}"
+    else
+	break
+    fi
+
+    rm -vrf "${TEMPORARY_FILES}/parallel-studio-install-data"
+    echo "Trying again..."
+
+    attempt=$(expr $attempt + 1)
+done
+
+if [ ! -e "${DESTINATION}/bin/compilervars.sh" ]; then
+	echo "Installation failed."
+	exit 1
+fi
+
+# Apparently the installer drops the license file in a location it
+# doesn't know to check.
+ln -s "${DESTINATION}"/licenses ~/Licenses
+
+# Add configuration information to ~/.bashrc.  Unfortunately this will
+# not be picked up automatically by Travis, so you'll still need to
+# source ~/.bashrc in your .travis.yml
+#
+# Container-based builds include a `[ -z "$PS1" ] && return` near the
+# beginning of the file, so appending won't work, we'll need to
+# prepend.
+echo "export INTEL_INSTALL_PATH=\"${DESTINATION}\"" >> ~/.bashrc-intel
+echo ". \"\${INTEL_INSTALL_PATH}/bin/compilervars.sh\" intel64" >> ~/.bashrc-intel
+echo "export LD_LIBRARY_PATH=\"\${INTEL_INSTALL_PATH}/ism/bin/intel64:\${INTEL_INSTALL_PATH}/lib/intel64_lin:\$LD_LIBRARY_PATH\"" >> ~/.bashrc-intel
+echo "export PATH=\"\${INTEL_INSTALL_PATH}/bin:\$PATH\"" >> ~/.bashrc-intel
+echo "function uninstall_intel_software {" >> ~/.bashrc-intel
+echo "  find \"\${INTEL_INSTALL_PATH}\" -name 'uninstall.sh' -not -path '*/ism/uninstall.sh' -exec {} -s \;" >> ~/.bashrc-intel
+echo "}" >> ~/.bashrc-intel
+cat ~/.bashrc >> ~/.bashrc-intel
+mv ~/.bashrc-intel ~/.bashrc

build-aux/local.mk

@@ -0,0 +1,22 @@
+## Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+EXTRA_DIST +=					\
+  build-aux/Darwin.valgrind			\
+  build-aux/Linux.valgrind			\
+  build-aux/cross-options.pl			\
+  build-aux/move-if-change			\
+  build-aux/prev-version.txt			\
+  build-aux/update-b4-copyright

build-aux/move-if-change

@@ -0,0 +1 @@
+../gnulib/build-aux/move-if-change

build-aux/snippet/.gitignore

@@ -1,4 +0,0 @@
-/_Noreturn.h
-/arg-nonnull.h
-/c++defs.h
-/warn-on-use.h

build-aux/update-b4-copyright

@@ -3,7 +3,7 @@
 # Update b4_copyright invocations or b4_copyright_years definitions to
 # include the current year.
 
-# Copyright (C) 2009-2012 Free Software Foundation, Inc.
+# Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

build-aux/update-package-copyright-year

@@ -2,7 +2,7 @@
 
 # In configure.ac, update PACKAGE_COPYRIGHT_YEAR to the current year.
 
-# Copyright (C) 2010-2012 Free Software Foundation, Inc.
+# Copyright (C) 2010-2015, 2018-2020 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

build-aux/update-test

@@ -0,0 +1,115 @@
+#! /usr/bin/env python
+
+# Update expectations in an Autotest test suite.
+
+# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+# Written by Akim Demaille.
+
+# usage:
+#
+#    update-test _build/8d/tests/testsuite.dir/*/testsuite.log
+#
+# from your source tree.
+import argparse
+import os
+import re
+
+
+def getargs():
+    p = argparse.ArgumentParser(description='Update test cases.')
+    opt = p.add_argument
+    opt('logs', metavar='log', nargs='+', type=str, default=None,
+        help='log files to process')
+    opt('-v', '--verbose', action='store_true',
+        help='Be verbose')
+    return p.parse_args()
+
+args = getargs()
+subst = dict()
+
+
+def trace(*args_):
+    if args.verbose:
+        print(*args_)
+
+
+def contents(file):
+    '''The contents of a file.'''
+    trace(file)
+    f = open(file)
+    return f.read()
+
+
+def diff_to_re(match):
+    '''Convert a portion of patch into a regex substitution to perform.
+    No longer used, we now use the expected/effective parts.
+    '''
+    frm = []
+    to = []
+    is_diff = False
+    for l in match.group(1).splitlines():
+        print(l)
+        # t in [-+ ]
+        t = l[0]
+        l = l[1:]
+        if t in ['-', ' ']:
+            is_diff = True
+            frm.append(l)
+        if t in ['+', ' ']:
+            is_diff = True
+            to.append(l)
+    if is_diff:
+        frm = "\n".join(frm)
+        to = "\n".join(to)
+        subst[frm] = to
+
+
+def update(at_file, logfile):
+    test = contents(at_file)
+    if os.path.isfile(logfile):
+        trace("LOG: ", logfile)
+        l = contents(logfile)
+        trace("LOG: ", l)
+        global subst
+        subst = {}
+        re.sub(r'(?:^@@.*\n)((?:^[-+ ].*\n)+)',
+               diff_to_re, l, flags = re.MULTILINE)
+        print(subst)
+        if subst:
+            # Turn "subst{frm} -> to" into a large RE.
+            frm = '|'.join([re.escape(x) for x in subst])
+            trace("FROM:", frm)
+            test = re.sub("(" + frm + ")",
+                          lambda m: subst[m.group(1)],
+                          test, flags=re.MULTILINE)
+    open(at_file, 'w').write(test)
+
+
+def process(logfile):
+    log = contents(logfile)
+    # Look for the file to update.
+    m = re.search(r'^\d+\. ([\-\+\w]+\.at):\d+: ', log, re.MULTILINE)
+    if not m:
+        trace("no diff found:", logfile)
+        return
+    at_file = 'tests/' + m.group(1)
+    print(at_file)
+    update(at_file, logfile)
+
+for logfile in args.logs:
+    trace("FILE:", logfile)
+    process(logfile)

cfg.mk

@@ -1,18 +1,18 @@
-# Customize maint.mk                           -*- makefile -*-
-# Copyright (C) 2008-2012 Free Software Foundation, Inc.
+## Customize maint.mk                           -*- makefile -*-
+## Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
 
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
 
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
 
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # Update version, then recompile so that tests/bison --version be
 # up-to-date, then compile our parser again with our up-to-date bison.
@@ -24,27 +24,25 @@ regen: _version
 
 # Used in maint.mk's web-manual rule
 manual_title = The Yacc-compatible Parser Generator
+gendocs_options_ = -I $(abs_top_srcdir)/doc -I $(abs_top_builddir)/doc
 
-# It's useful to run maintainer-*check* targets during development, but we
+# By default, propagate -j from make to Bison's test suite.
+TESTSUITEFLAGS = $(filter -j%,$(MAKEFLAGS))
+
+# It's useful to run maintainer-check* targets during development, but we
 # don't want to wait on a recompile because of an update to $(VERSION).  Thus,
-# override the _is-dist-target from GNUmakefile so that maintainer-*check*
+# override the _is-dist-target from GNUmakefile so that maintainer-check*
 # targets are filtered out.
-_is-dist-target = $(filter-out %clean maintainer-check% maintainer-%-check, \
+_is-dist-target = $(filter-out %clean maintainer-check%, \
   $(filter maintainer-% dist% alpha beta major,$(MAKECMDGOALS)))
 
 url_dir_list = \
-  ftp://$(gnu_rel_host)/gnu/bison
+  https://$(gnu_rel_host)/gnu/bison
 
 # Tests not to run as part of "make distcheck".
-# Exclude changelog-check here so that there's less churn in ChangeLog
-# files -- otherwise, you'd need to have the upcoming version number
-# at the top of the file for each `make distcheck' run.
-local-checks-to-skip = \
-  changelog-check \
+local-checks-to-skip =			\
   sc_immutable_NEWS			\
-  sc_prohibit_always_true_header_tests	\
-  sc_prohibit_atoi_atof			\
-  sc_prohibit_strcmp
+  sc_prohibit_atoi_atof
 
 # The local directory containing the checked-out copy of gnulib used in
 # this release.  Used solely to get a date for the "announcement" target.
@@ -60,20 +58,118 @@ update-copyright: update-b4-copyright update-package-copyright-year
 update-copyright-env = \
   UPDATE_COPYRIGHT_FORCE=1 UPDATE_COPYRIGHT_USE_INTERVALS=1
 
+
+## -------------------- ##
+## More syntax-checks.  ##
+## -------------------- ##
+
+# Indent only with spaces.
+# Taken from Coreutils.
+sc_prohibit_tab_based_indentation:
+	@prohibit='^ *	'						\
+	halt='TAB in indentation; use only spaces'			\
+	  $(_sc_search_regexp)
+
+# Prohibit the use of `...` in tests/.  Use $(...) instead.
+# Taken from Coreutils.
+# Not ready for Bison yet.
+#sc_prohibit_test_backticks:
+#	@prohibit='`' in_vc_files='^tests/'		\
+#	halt='use $$(...), not `...` in tests/'		\
+#	  $(_sc_search_regexp)
+
+# Enforce recommended preprocessor indentation style.
+# Taken from Coreutils.
+sc_preprocessor_indentation:
+	@if cppi --version >/dev/null 2>&1; then			\
+	  $(VC_LIST_EXCEPT) | grep '\.[ch]$$' | xargs cppi -a -c	\
+	    || { echo '$(ME): incorrect preprocessor indentation' 1>&2;	\
+		exit 1; };						\
+	else								\
+	  echo '$(ME): skipping test $@: cppi not installed' 1>&2;	\
+	fi
+
+###########################################################
+# Taken from Coreutils.
+_p0 = \([^"'/]\|"\([^\"]\|[\].\)*"\|'\([^\']\|[\].\)*'
+_pre = $(_p0)\|[/][^"'/*]\|[/]"\([^\"]\|[\].\)*"\|[/]'\([^\']\|[\].\)*'\)*
+_pre_anchored = ^\($(_pre)\)
+_comment_and_close = [^*]\|[*][^/*]\)*[*][*]*/
+# help font-lock mode: '
+
+# A sed expression that removes ANSI C and ISO C99 comments.
+# Derived from the one in GNU gettext's 'moopp' preprocessor.
+_sed_remove_comments =					\
+/[/][/*]/{						\
+  ta;							\
+  :a;							\
+  s,$(_pre_anchored)//.*,\1,;				\
+  te;							\
+  s,$(_pre_anchored)/[*]\($(_comment_and_close),\1 ,;	\
+  ta;							\
+  /^$(_pre)[/][*]/{					\
+    s,$(_pre_anchored)/[*].*,\1 ,;			\
+    tu;							\
+    :u;							\
+    n;							\
+    s,^\($(_comment_and_close),,;			\
+    tv;							\
+    s,^.*$$,,;						\
+    bu;							\
+    :v;							\
+  };							\
+  :e;							\
+}
+# Quote all single quotes.
+_sed_rm_comments_q = $(subst ','\'',$(_sed_remove_comments))
+# help font-lock mode: '
+
+_space_before_paren_exempt =? \\n\\$$
+_space_before_paren_exempt = \
+  (^ *\#|(LA)?LR\([01]\)|percent_(code|define)|b4_syncline|m4_(define|init)|symbol)
+# Ensure that there is a space before each open parenthesis in C code.
+sc_space_before_open_paren:
+	@if $(VC_LIST_EXCEPT) | grep -l '\.[ch]$$' > /dev/null; then	\
+	  fail=0;							\
+	  for c in $$($(VC_LIST_EXCEPT) | grep '\.[ch]$$'); do		\
+	    sed '$(_sed_rm_comments_q)' $$c 2>/dev/null			\
+	      | grep -i '[[:alnum:]]('					\
+	      | grep -vE '$(_space_before_paren_exempt)'		\
+	      | grep . && { fail=1; echo "*** $$c"; };			\
+	  done;								\
+	  test $$fail = 1 &&						\
+	    { echo '$(ME): the above files lack a space-before-open-paren' \
+		1>&2; exit 1; } || :;					\
+	else :;								\
+	fi
+
+## -------------------------- ##
+## syntax-checks exceptions.  ##
+## -------------------------- ##
+
+# po-check: we use gnulib-po, so we don't need/want them in our POTFILE.
+generated_files =
+
 exclude = \
   $(foreach a,$(1),$(eval $(subst $$,$$$$,exclude_file_name_regexp--sc_$(a))))
-$(call exclude,								\
-  bindtextdomain=^lib/main.c$$						\
-  program_name=^lib/main.c$$						\
-  prohibit_always-defined_macros=^data/yacc.c$$|^djgpp/			\
-  prohibit_always-defined_macros+=?|^lib/timevar.c$$			\
-  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$	\
-  prohibit_always-defined_macros+=?|^tests/regression.at$$		\
-  prohibit_defined_have_decl_tests=?|^lib/timevar.c$$			\
-  prohibit_magic_number_exit=^doc/bison.texi$$				\
-  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$	\
-  require_config_h_first=^(lib/yyerror|data/(glr|yacc))\.c$$		\
-  space_tab=^tests/(input|c\+\+)\.at$$					\
-  trailing_blank=^src/parse-gram.[ch]$$					\
-  unmarked_diagnostics=^(djgpp/|doc/bison.texi$$)			\
+
+$(call exclude,                                                                 \
+  bindtextdomain=^lib/main.c$$                                                  \
+  cast_of_argument_to_free=^src/muscle-tab.c$$                                  \
+  po_check=^tests|(^po/POTFILES.in|.md)$$                                       \
+  preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                  \
+  program_name=^lib/main.c$$                                                    \
+  prohibit_always-defined_macros=^data/skeletons/yacc.c$$                       \
+  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$              \
+  prohibit_always-defined_macros+=?|^tests/regression.at$$                      \
+  prohibit_doubled_word=^tests/named-refs.at$$                                  \
+  prohibit_magic_number_exit=^doc/bison.texi$$                                  \
+  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$              \
+  prohibit_strcmp=^doc/bison\.texi|examples|tests                               \
+  prohibit_tab_based_indentation=install-icc.sh|\.(am|mk)$$|^\.git|tests/input.at|Makefile$$   \
+  require_config_h=^(lib/yyerror|data/skeletons/(glr|yacc))\.c$$                \
+  require_config_h_first=^(lib/yyerror|data/skeletons/(glr|yacc))\.c$$          \
+  space_before_open_paren=^data/skeletons/                                      \
+  two_space_separator_in_usage=^(bootstrap|build-aux/install-icc.sh)            \
+  unmarked_diagnostics=^(doc/bison.texi$$|tests/c\+\+\.at$$)                    \
 )

configure.ac

@@ -1,6 +1,6 @@
 # Configure template for GNU Bison.                   -*-Autoconf-*-
 #
-# Copyright (C) 2001-2012 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -18,26 +18,28 @@
 # In order for some versions of Sun Studio to compile our C++ test cases
 # correctly, we need Autoconf 2.64 or better to handle the restrict
 # keyword in at least string.h from gnulib.  We need Autoconf 2.68 or
-# better to avoid a typo in the `configure --help' entry for the YACC
+# better to avoid a typo in the 'configure --help' entry for the YACC
 # environment variable.
 AC_PREREQ([2.68])
-m4_pattern_forbid([^gl_[A-Z]])
+m4_pattern_forbid([^_?(gl_[A-Z]|AX_|BISON_)])
+m4_pattern_allow([^BISON_USE_NLS$])
 
 AC_INIT([GNU Bison],
         m4_esyscmd([build-aux/git-version-gen .tarball-version]),
-        [[email protected]])
-AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2012])
+        [[email protected]],
+        [],
+        [https://www.gnu.org/software/bison/])
+AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2020])
 AC_DEFINE_UNQUOTED([PACKAGE_COPYRIGHT_YEAR], [$PACKAGE_COPYRIGHT_YEAR],
                    [The copyright year for this package])
 
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 
-# Automake 1.10.3 and 1.11.1 fix a security flaw discussed here:
+# We use Automake 1.14's %D% and %C%.
 #
-#   http://thread.gmane.org/gmane.comp.sysutils.autotools.announce/131
-#
-# To avoid 1.11, we make 1.11.1 the minimum version.
+# When we move to Automake 1.16, simplify examples/c/reccalc/local.mk.
+# Our CI runs on Xenial, which has only Automake 1.15.
 #
 # We want gnits strictness only when rolling a stable release.  For
 # release candidates, we use version strings like 2.4.3_rc1, but gnits
@@ -45,7 +47,9 @@ AC_CONFIG_MACRO_DIR([m4])
 # releases, we want to be able run make dist without being required to
 # add a bogus NEWS entry.  In that case, the version string
 # automatically contains a dash, which we also let disable gnits.
-AM_INIT_AUTOMAKE([1.11.1 dist-xz silent-rules]
+AM_INIT_AUTOMAKE([1.14 dist-xz nostdinc
+                 color-tests parallel-tests
+                 silent-rules]
                  m4_bmatch(m4_defn([AC_PACKAGE_VERSION]), [[-_]],
                            [gnu], [gnits]))
 AM_SILENT_RULES([yes])
@@ -58,65 +62,208 @@ AC_PROG_CXX
 # Gnulib (early checks).
 gl_EARLY
 
+# Gnulib uses '#pragma GCC diagnostic push' to silence some
+# warnings, but older gcc doesn't support this.
+AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
+  [lv_cv_gcc_pragma_push_works], [
+  save_CFLAGS=$CFLAGS
+  CFLAGS='-Wunknown-pragmas -Werror'
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic pop
+  ]])],
+  [lv_cv_gcc_pragma_push_works=yes],
+  [lv_cv_gcc_pragma_push_works=no])
+  CFLAGS=$save_CFLAGS])
+
+AC_LANG_PUSH([C++])
+gl_WARN_ADD([-fno-exceptions], [NO_EXCEPTIONS_CXXFLAGS])
+BISON_CXXSTD([98])
+BISON_CXXSTD([03])
+BISON_CXXSTD([11])
+BISON_CXXSTD([14])
+BISON_CXXSTD([17])
+BISON_CXXSTD([2a])
+AM_CONDITIONAL([ENABLE_CXX11], [test x"$CXX11_CXXFLAGS" != x])
+AM_CONDITIONAL([ENABLE_CXX14], [test x"$CXX14_CXXFLAGS" != x])
+AC_LANG_POP([C++])
+
 AC_ARG_ENABLE([gcc-warnings],
-[  --enable-gcc-warnings   turn on lots of GCC warnings (not recommended)],
+[  --enable-gcc-warnings   turn on lots of GCC warnings (not recommended).
+                           Also, issue synclines from the examples/ to
+                           the corresponding source in the Texinfo doc.],
 [case $enable_gcc_warnings in
    yes|no) ;;
    *)  AC_MSG_ERROR([invalid value for --gcc-warnings: $enable_gcc_warnings]);;
  esac],
               [enable_gcc_warnings=no])
+AM_CONDITIONAL([ENABLE_GCC_WARNINGS], [test "$enable_gcc_warnings" = yes])
 if test "$enable_gcc_warnings" = yes; then
-  warn_common='-Wall -Wextra -Wno-sign-compare -Wcast-align
-    -Wcast-qual -Wformat -Wpointer-arith -Wwrite-strings'
-  warn_c='-Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes
-    -Wshadow -Wstrict-prototypes'
-  warn_cxx='-Wnoexcept'
+  # -Wno-tautological-constant-out-of-range-compare for Clang 3.3 and
+  # 3.4 on GNU/Linux that choke on intprops.h's INT_MULTIPLY_WRAPV,
+  # etc.
+  #
+  # ICC: -wr188
+  #
+  # 1669  warnings warnings_default =
+  # ../src/complain.c(318): error #188: enumerated type mixed with another type
+  # 1670      Wconflicts_sr | Wconflicts_rr | Wdeprecated | Wother;
+  # 1671      ^
+  # 1672
+  # 1673../src/complain.c(393): error #188: enumerated type mixed with another type
+  # 1674          warnings w = 1 << wbit;
+  # 1675                       ^
+  #
+  # ICC: -wr3179
+  #
+  # char const *usefulness
+  #   = rule_useless_in_grammar_p (&rules[r]) ? "useless-in-grammar"
+  #   : rule_useless_in_parser_p (&rules[r])  ? "useless-in-parser"
+  #   :                                         "useful";
+  #
+  # gives
+  #
+  # error #3179: deprecated conversion of string literal to char* (should be const char*)
+  #
+  # ICC: -wr2259 (that's in C, in spite of what the error messages which seems to be about C++).
+  # error #2259: non-pointer conversion from "int" to "yybool={signed char}" may lose significant bits
+  #   yybool yynormal YY_ATTRIBUTE_UNUSED = yystackp->yysplitPoint == YY_NULLPTR;
+  #                                         ^
+  warn_common='-Wall -Wextra
+    -Wcast-align -Wchar-subscripts
+    -fparse-all-comments -Wdocumentation
+    -Wformat -Wimplicit-fallthrough -Wnull-dereference
+    -Wno-sign-compare -Wno-tautological-constant-out-of-range-compare
+    -Wpointer-arith -Wshadow
+    -Wwrite-strings
+    -wr188 -wr2259 -wr3179'
+  warn_c='-Wbad-function-cast -Wstrict-prototypes'
+  warn_cxx='-Wextra-semi -Wnoexcept -Wold-style-cast -Wundefined-func-template
+    -Wweak-vtables'
+  # Warnings for the test suite only.
+  #
+  # -fno-color-diagnostics: Clang's use of colors in the error
+  # messages is confusing the tests looking at the compiler's output
+  # (e.g., synclines.at).
+  #
+  # -Wno-keyword-macro: We use the "#define private public" dirty
+  # trick in the test suite to check some private implementation
+  # details for lalr1.cc.
+  warn_tests='-Wundef -pedantic -Wconversion
+    -Wdeprecated -Wsign-compare -Wsign-conversion
+    -Wtautological-constant-out-of-range-compare
+    -fno-color-diagnostics
+    -Wno-keyword-macro'
+
+
   AC_LANG_PUSH([C])
+  # Clang supports many of GCC's -W options, but only issues warnings
+  # on the ones it does not recognize.  In that case, gl_WARN_ADD
+  # thinks the option is supported, and unknown options are then added
+  # to CFLAGS.  But then, when -Werror is added in the test suite for
+  # instance, the warning about the unknown option turns into an
+  # error.
+  #
+  # This should be addressed by gnulib's gl_WARN_ADD, but in the
+  # meanwhile, turn warnings about unknown options into errors in
+  # CFLAGS, and restore CFLAGS after the tests.
+  save_CFLAGS=$CFLAGS
+  gl_WARN_ADD([-Werror=unknown-warning-option], [CFLAGS])
+  # Accept this warning only if it is not too touchy (e.g., clang 3.3
+  # and 3.4).
+  gl_WARN_ADD([-Wunreachable-code], [WARN_CFLAGS],
+              [AC_LANG_PROGRAM([],
+              [[if (sizeof (long) < sizeof (int)) return 1;]])])
   for i in $warn_common $warn_c;
   do
     gl_WARN_ADD([$i], [WARN_CFLAGS])
   done
   gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
+
+  # Warnings for the test suite, and maybe for bison if GCC is modern
+  # enough.
+  test $lv_cv_gcc_pragma_push_works = yes &&
+    AS_VAR_APPEND([WARN_CFLAGS], [" $WARN_CFLAGS_TEST"])
+
   # Warnings for the test suite only.
-  gl_WARN_ADD([-Wundef], [WARN_CFLAGS_TEST])
-  gl_WARN_ADD([-pedantic], [WARN_CFLAGS_TEST])
+  for i in $warn_tests -Wincompatible-pointer-types;
+  do
+    gl_WARN_ADD([$i], [WARN_CFLAGS_TEST])
+  done
+  CFLAGS=$save_CFLAGS
   AC_LANG_POP([C])
 
+
   AC_LANG_PUSH([C++])
+  save_CXXFLAGS=$CXXFLAGS
+  gl_WARN_ADD([-Werror=unknown-warning-option], [CXXFLAGS])
   for i in $warn_common $warn_cxx;
   do
     gl_WARN_ADD([$i], [WARN_CXXFLAGS])
   done
-  gl_WARN_ADD([ -Wzero-as-null-pointer-constant], [WARN_CXXFLAGS],
+  # Accept this warning only if it is not too touchy (e.g., clang 3.3
+  # and 3.4).
+  gl_WARN_ADD([-Wunreachable-code], [WARN_CXXFLAGS],
+              [AC_LANG_PROGRAM([],
+              [[if (sizeof (long) < sizeof (int)) return 1;]])])
+  gl_WARN_ADD([-Wzero-as-null-pointer-constant], [WARN_CXXFLAGS],
               [AC_LANG_PROGRAM([], [nullptr])])
+  # Before GCC6, the pragmas don't work well enough to neutralize
+  # this warning.
+  gl_WARN_ADD([-Wuseless-cast], [WARN_CXXFLAGS],
+              [AC_LANG_PROGRAM([], [
+              #if defined __GNUC__ && ! defined __ICC && ! defined __clang__ && __GNUC__ < 6
+              syntax error
+              #endif
+              ])])
   gl_WARN_ADD([-Werror], [WERROR_CXXFLAGS])
   # Warnings for the test suite only.
-  gl_WARN_ADD([-Wundef], [WARN_CXXFLAGS_TEST])
-  gl_WARN_ADD([-pedantic], [WARN_CXXFLAGS_TEST])
+  for i in $warn_tests;
+  do
+    gl_WARN_ADD([$i], [WARN_CXXFLAGS_TEST])
+  done
+  # Too many compilers complain about Flex generated code.
+  gl_WARN_ADD([-Wno-error], [FLEX_SCANNER_CXXFLAGS])
+  # Clang++ deprecates compiling C.
+  gl_WARN_ADD([-Wno-deprecated], [WNO_DEPRECATED_CXXFLAGS])
+  CXXFLAGS=$save_CXXFLAGS
   AC_LANG_POP([C++])
 fi
 
+
 BISON_TEST_FOR_WORKING_C_COMPILER
+BISON_C_COMPILER_POSIXLY_CORRECT
 BISON_TEST_FOR_WORKING_CXX_COMPILER
+BISON_CXX_COMPILER_POSIXLY_CORRECT
+
+# D.
+AC_CHECK_PROGS([DC], [dmd])
+AC_CHECK_PROGS([DCFLAGS], [-g])
+AM_CONDITIONAL([ENABLE_D], [test x"$DC" != x])
+
+# Java.
+gt_JAVACOMP([1.7], [1.7])
+gt_JAVAEXEC
+AM_CONDITIONAL([ENABLE_JAVA], [test x"$CONF_JAVAC" != x && test x"$CONF_JAVA" != x])
+
 
 AC_ARG_ENABLE([yacc],
   [AC_HELP_STRING([--disable-yacc],
      [do not build a yacc command or an -ly library])],
   , [enable_yacc=yes])
-case $enable_yacc in
-yes)
-  YACC_SCRIPT=yacc
-  YACC_LIBRARY=liby.a;;
-*)
-  YACC_SCRIPT=
-  YACC_LIBRARY=;;
-esac
-AC_SUBST([YACC_SCRIPT])
-AC_SUBST([YACC_LIBRARY])
+AM_CONDITIONAL([ENABLE_YACC], [test "$enable_yacc" = yes])
+AC_CONFIG_FILES([src/yacc], [chmod +x src/yacc])
 
 # Checks for programs.
+AM_MISSING_PROG([DOT], [dot])
 AC_PROG_LEX
-$LEX_IS_FLEX || AC_MSG_ERROR([Flex is required])
+if ! "$LEX_IS_FLEX" || test "X$LEX" = X:; then
+  AC_MSG_WARN([bypassing lex because flex is required])
+  LEX=:
+fi
+AM_CONDITIONAL([FLEX_WORKS], [$LEX_IS_FLEX && $FLEX_SUPPORTS_HEADER_OPT])
+AM_CONDITIONAL([FLEX_CXX_WORKS],
+  [$LEX_IS_FLEX && $FLEX_SUPPORTS_HEADER_OPT && test $bison_cv_cxx_works = yes])
 AC_PROG_YACC
 AC_PROG_RANLIB
 AC_PROG_GNU_M4
@@ -124,9 +271,6 @@ AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the GNU M4 executable name.])
 AC_DEFINE_UNQUOTED([M4_GNU_OPTION], ["$M4_GNU"], [Define to "-g" if GNU M4
 supports -g, otherwise to "".])
 AC_PATH_PROG([PERL], [perl])
-if test -z "$PERL"; then
-   AC_MSG_ERROR([perl not found])
-fi
 AM_MISSING_PROG([HELP2MAN], [help2man])
 AC_PATH_PROG([XSLTPROC], [xsltproc])
 AC_SUBST([XSLTPROC])
@@ -143,15 +287,14 @@ gl_INIT
 
 # Checks for library functions.
 AC_CHECK_FUNCS_ONCE([setlocale])
-AM_WITH_DMALLOC
-BISON_PREREQ_TIMEVAR
 
 # Gettext.
 # We use gnulib, which is only guaranteed to work properly with the
 # latest Gettext.
 AM_GNU_GETTEXT([external], [need-ngettext])
-AM_GNU_GETTEXT_VERSION([0.18])
+AM_GNU_GETTEXT_VERSION([0.19])
 BISON_I18N
+AC_CONFIG_FILES([gnulib-po/Makefile.in])
 
 # Internationalized parsers.
 AC_CONFIG_FILES([runtime-po/Makefile.in])
@@ -164,34 +307,54 @@ AC_CONFIG_FILES([etc/bench.pl], [chmod +x etc/bench.pl])
 
 # Initialize the test suite.
 AC_CONFIG_TESTDIR(tests)
-AC_CONFIG_FILES([tests/Makefile tests/atlocal])
+AC_CONFIG_FILES([tests/atlocal])
 AC_CONFIG_FILES([tests/bison], [chmod +x tests/bison])
+
 AC_CHECK_PROGS([VALGRIND], [valgrind])
-case $VALGRIND:$host_os in
+# Use something simpler that $host_os to select our suppression file.
+uname=`uname`
+case $VALGRIND:$uname in
   '':*) ;;
-  *:darwin*)
-    # See README-hacking.
-    # VALGRIND+=' --suppressions=$(abs_top_srcdir)/build-aux/darwin11.4.0.valgrind'
+  *:Darwin)
+    # See README-hacking.md.
     VALGRIND=;;
   *:*)
-    AC_SUBST([VALGRIND_PREBISON], ["$VALGRIND -q"]);;
+    suppfile=build-aux/$uname.valgrind
+    if test -f "$srcdir/$suppfile"; then
+      AC_SUBST([VALGRIND_OPTS_SUPPRESSION],
+               ["--suppressions=\$(abs_top_srcdir)/$suppfile"])
+    fi
+    ;;
 esac
+AC_MSG_CHECKING([Valgrind suppression file])
+AC_MSG_RESULT([$suppfile])
+
+# Whether we cannot run the compiled bison.
+AM_CONDITIONAL([CROSS_COMPILING], [test "$cross_compiling" = yes])
+
+# Build bistromathic if we have the lib and both readline/readline.h
+# and readline/history.h.
+AM_CONDITIONAL([ENABLE_BISTROMATHIC],
+[test "$gl_cv_lib_readline" != no &&
+  test "$ac_cv_header_readline_readline_h" = yes &&
+  test "$ac_cv_header_readline_history_h" = yes])
 
 AM_MISSING_PROG([AUTOM4TE], [autom4te])
 # Needed by tests/atlocal.in.
 AC_SUBST([GCC])
 
-gt_JAVACOMP([1.3])
-gt_JAVAEXEC
-
 AC_CONFIG_FILES([Makefile
-		 build-aux/Makefile
-		 po/Makefile.in
-		 data/Makefile
-		 etc/Makefile
-		 examples/Makefile
-		    examples/calc++/Makefile
-		 lib/Makefile src/Makefile
-		 doc/Makefile
-		   doc/yacc.1])
+                 po/Makefile.in
+                 doc/yacc.1])
+
+# Fix LIBOBJS to give the Makefile the right file names.  Otherwise
+# compilation works, but with unexpected file names, so clean rules don't
+# remove the actual files and distcheck fails.
+AC_CONFIG_COMMANDS_PRE([
+  case $am__api_version in
+    1.14*|1.15*) gl_LIBOBJS=`echo "$gl_LIBOBJS" | sed -e 's, lib/, lib/lib_libbison_a-,g'`;;
+    *)           gl_LIBOBJS=`echo "$gl_LIBOBJS" | sed -e 's, lib/, lib/libbison_a-,g'`;;
+  esac
+])
+
 AC_OUTPUT

data/.cvsignore

@@ -1,2 +0,0 @@
-Makefile.in
-Makefile

data/.gitignore

@@ -1,2 +0,0 @@
-/Makefile.in
-/Makefile

data/Makefile.am

@@ -1,30 +0,0 @@
-## Copyright (C) 2002, 2005-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-dist_pkgdata_DATA = README bison.m4 \
-   c-like.m4 \
-   c-skel.m4 c.m4 yacc.c glr.c \
-   c++-skel.m4 c++.m4 location.cc lalr1.cc glr.cc stack.hh \
-   java-skel.m4 java.m4 lalr1.java
-
-m4sugardir = $(pkgdatadir)/m4sugar
-dist_m4sugar_DATA = m4sugar/m4sugar.m4 m4sugar/foreach.m4
-
-xsltdir = $(pkgdatadir)/xslt
-dist_xslt_DATA =				\
-   xslt/bison.xsl				\
-   xslt/xml2dot.xsl				\
-   xslt/xml2text.xsl				\
-   xslt/xml2xhtml.xsl

data/README

@@ -1,70 +0,0 @@
--*- outline -*-
-
-This directory contains data needed by Bison.
-
-* Skeletons
-Bison skeletons: the general shapes of the different parser kinds,
-that are specialized for specific grammars by the bison program.
-
-Currently, the supported skeletons are:
-
-- yacc.c
-  It used to be named bison.simple: it corresponds to C Yacc
-  compatible LALR(1) parsers.
-
-- lalr1.cc
-  Produces a C++ parser class.
-
-- lalr1.java
-  Produces a Java parser class.
-
-- glr.c
-  A Generalized LR C parser based on Bison's LALR(1) tables.
-
-- glr.cc
-  A Generalized LR C++ parser.  Actually a C++ wrapper around glr.c.
-
-These skeletons are the only ones supported by the Bison team.
-Because the interface between skeletons and the bison program is not
-finished, *we are not bound to it*.  In particular, Bison is not
-mature enough for us to consider that ``foreign skeletons'' are
-supported.
-
-* m4sugar
-This directory contains M4sugar, sort of an extended library for M4,
-which is used by Bison to instantiate the skeletons.
-
-* xslt
-This directory contains XSLT programs that transform Bison's XML output
-into various formats.
-
-- bison.xsl
-  A library of routines used by the other XSLT programs.
-
-- xml2dot.xsl
-  Conversion into GraphViz's dot format.
-
-- xml2text.xsl
-  Conversion into text.
-
-- xml2xhtml.xsl
-  Conversion into XHTML.
-
------
-
-Copyright (C) 2002, 2008-2012 Free Software Foundation, Inc.
-
-This file is part of GNU Bison.
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.

data/README.md

@@ -0,0 +1,199 @@
+This directory contains data needed by Bison.
+
+# Directory content
+## Skeletons
+Bison skeletons: the general shapes of the different parser kinds, that are
+specialized for specific grammars by the bison program.
+
+Currently, the supported skeletons are:
+
+- yacc.c
+  It used to be named bison.simple: it corresponds to C Yacc
+  compatible LALR(1) parsers.
+
+- lalr1.cc
+  Produces a C++ parser class.
+
+- lalr1.java
+  Produces a Java parser class.
+
+- glr.c
+  A Generalized LR C parser based on Bison's LALR(1) tables.
+
+- glr.cc
+  A Generalized LR C++ parser.  Actually a C++ wrapper around glr.c.
+
+These skeletons are the only ones supported by the Bison team.  Because the
+interface between skeletons and the bison program is not finished, *we are
+not bound to it*.  In particular, Bison is not mature enough for us to
+consider that "foreign skeletons" are supported.
+
+## m4sugar
+This directory contains M4sugar, sort of an extended library for M4, which
+is used by Bison to instantiate the skeletons.
+
+## xslt
+This directory contains XSLT programs that transform Bison's XML output into
+various formats.
+
+- bison.xsl
+  A library of routines used by the other XSLT programs.
+
+- xml2dot.xsl
+  Conversion into GraphViz's dot format.
+
+- xml2text.xsl
+  Conversion into text.
+
+- xml2xhtml.xsl
+  Conversion into XHTML.
+
+# Implementation note about the skeletons
+
+"Skeleton" in Bison parlance means "backend": a skeleton is fed by the bison
+executable with LR tables, facts about the symbols, etc. and they generate
+the output (say parser.cc, parser.hh, location.hh, etc.).  They are only in
+charge of generating the parser and its auxiliary files, they do not
+generate the XML output, the parser.output reports, nor the graphical
+rendering.
+
+The bits of information passing from bison to the backend is named
+"muscles".  Muscles are passed to M4 via its standard input: it's a set of
+m4 definitions.  To see them, use `--trace=muscles`.
+
+Except for muscles, whose names are generated by bison, the skeletons have
+no constraint at all on the macro names: there is no technical/theoretical
+limitation, as long as you generate the output, you can do what you want.
+However, of course, that would be a bad idea if, say, the C and C++
+skeletons used different approaches and had completely different
+implementations.  That would be a maintenance nightmare.
+
+Below, we document some of the macros that we use in several of the
+skeletons.  If you are to write a new skeleton, please, implement them for
+your language.  Overall, be sure to follow the same patterns as the existing
+skeletons.
+
+## Symbols
+
+### `b4_symbol(NUM, FIELD)`
+In order to unify the handling of the various aspects of symbols (tag, type
+name, whether terminal, etc.), bison.exe defines one macro per (token,
+field), where field can `has_id`, `id`, etc.: see
+`prepare_symbols_definitions()` in `src/output.c`.
+
+The macro `b4_symbol(NUM, FIELD)` gives access to the following FIELDS:
+
+- `has_id`: 0 or 1
+  Whether the symbol has an id.
+
+- `id`: string
+  If has_id, the id (prefixed by api.token.prefix if defined), otherwise
+  defined as empty.  Guaranteed to be usable as a C identifier.  This is
+  used to define the token kind (i.e., the enum used by the return value of
+  yylex).
+
+- `tag`: string
+  A human representation of the symbol.  Can be 'foo', 'foo.id', '"foo"' etc.
+
+- `user_number`: integer
+  The code associated to the `id`.
+  The external number as used by yylex.  Can be ASCII code when a character,
+  some number chosen by bison, or some user number in the case of
+  %token FOO <NUM>.  Corresponds to yychar in yacc.c.
+
+- `is_token`: 0 or 1
+  Whether this is a terminal symbol.
+
+- `kind`: string
+  The symbol kind, i.e., the enumerator of this symbol (token or nonterminal)
+  which is mapping to its `number`.
+
+- `number`: integer
+  The code associated to the `kind`.
+  The internal number (computed from the external number by yytranslate).
+  Corresponds to yytoken in yacc.c.  This is the same number that serves as
+  key in b4_symbol(NUM, FIELD).
+
+  In bison, symbols are first assigned increasing numbers in order of
+  appearance (but tokens first, then nterms).  After grammar reduction,
+  unused nterms are then renumbered to appear last (i.e., first tokens, then
+  used nterms and finally unused nterms).  This final number NUM is the one
+  contained in this field, and it is the one used as key in `b4_symbol(NUM,
+  FIELD)`.
+
+  The code of the rule actions, however, is emitted before we know what
+  symbols are unused, so they use the original numbers.  To avoid confusion,
+  they actually use "orig NUM" instead of just "NUM".  bison also emits
+  definitions for `b4_symbol(orig NUM, number)` that map from original
+  numbers to the new ones.  `b4_symbol` actually resolves `orig NUM` in the
+  other case, i.e., `b4_symbol(orig 42, tag)` would return the tag of the
+  symbols whose original number was 42.
+
+- `has_type`: 0, 1
+  Whether has a semantic value.
+
+- `type_tag`: string
+  When api.value.type=union, the generated name for the union member.
+  yytype_INT etc. for symbols that has_id, otherwise yytype_1 etc.
+
+- `type`
+  If it has a semantic value, its type tag, or, if variant are used,
+  its type.
+  In the case of api.value.type=union, type is the real type (e.g. int).
+
+- `has_printer`: 0, 1
+- `printer`: string
+- `printer_file`: string
+- `printer_line`: integer
+- `printer_loc`: location
+  If the symbol has a printer, everything about it.
+
+- `has_destructor`, `destructor`, `destructor_file`, `destructor_line`, `destructor_loc`
+  Likewise.
+
+### `b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])`
+Expansion of $$, $1, $<TYPE-TAG>3, etc.
+
+The semantic value from a given VAL.
+- `VAL`: some semantic value storage (typically a union).  e.g., `yylval`
+- `SYMBOL-NUM`: the symbol number from which we extract the type tag.
+- `TYPE-TAG`, the user forced the `<TYPE-TAG>`.
+
+The result can be used safely, it is put in parens to avoid nasty precedence
+issues.
+
+### `b4_lhs_value(SYMBOL-NUM, [TYPE])`
+Expansion of `$$` or `$<TYPE>$`, for symbol `SYMBOL-NUM`.
+
+### `b4_rhs_data(RULE-LENGTH, POS)`
+The data corresponding to the symbol `#POS`, where the current rule has
+`RULE-LENGTH` symbols on RHS.
+
+### `b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])`
+Expansion of `$<TYPE>POS`, where the current rule has `RULE-LENGTH` symbols
+on RHS.
+
+-----
+
+Local Variables:
+mode: markdown
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+Copyright (C) 2002, 2008-2015, 2018-2020 Free Software Foundation, Inc.
+
+This file is part of GNU Bison.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.

data/bison-default.css

@@ -0,0 +1,34 @@
+/* Default styling rules for Bison when doing terminal output.
+   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* This is an experimental feature.  The class names may change in the
+   future.  */
+
+/* Diagnostics.  */
+.warning   { color: purple; }
+.error     { color: red; }
+.note      { color: cyan; }
+
+.fixit-insert { color: green; }
+
+/* Semantic values in Bison's own parser traces.  */
+.value     { color: green; }
+
+/* "Sections" in traces (--trace).  */
+.trace0    { color: green; }
+
+.expected   { color: green; }
+.unexpected { color: red; }

data/bison.m4

@@ -1,586 +0,0 @@
-                                                            -*- Autoconf -*-
-
-# Language-independent M4 Macros for Bison.
-
-# Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-## ---------------- ##
-## Identification.  ##
-## ---------------- ##
-
-# b4_copyright(TITLE, YEARS)
-# --------------------------
-m4_define([b4_copyright],
-[b4_comment([A Bison parser, made by GNU Bison b4_version.])
-
-b4_comment([$1
-
-m4_text_wrap([Copyright (C) $2 Free Software Foundation, Inc.], [   ])
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.])
-
-b4_comment([As a special exception, you may create a larger work that contains
-part or all of the Bison parser skeleton and distribute that work
-under terms of your choice, so long as that work isn't itself a
-parser generator using the skeleton or a modified version thereof
-as a parser skeleton.  Alternatively, if you modify or redistribute
-the parser skeleton itself, you may (at your option) remove this
-special exception, which will cause the skeleton and the resulting
-Bison output files to be licensed under the GNU General Public
-License without this special exception.
-
-This special exception was added by the Free Software Foundation in
-version 2.2 of Bison.])])
-
-
-## ---------------- ##
-## Error handling.  ##
-## ---------------- ##
-
-# The following error handling macros print error directives that should not
-# become arguments of other macro invocations since they would likely then be
-# mangled.  Thus, they print to stdout directly.
-
-# b4_cat(TEXT)
-# ------------
-# Write TEXT to stdout.  Precede the final newline with an @ so that it's
-# escaped.  For example:
-#
-#   b4_cat([[@complain(invalid input@)]])
-m4_define([b4_cat],
-[m4_syscmd([cat <<'_m4eof'
-]m4_bpatsubst(m4_dquote($1), [_m4eof], [_m4@`eof])[@
-_m4eof
-])dnl
-m4_if(m4_sysval, [0], [], [m4_fatal([$0: cannot write to stdout])])])
-
-# b4_error(KIND, FORMAT, [ARG1], [ARG2], ...)
-# -------------------------------------------
-# Write @KIND(FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# For example:
-#
-#   b4_error([[warn]], [[invalid value for '%s': %s]], [[foo]], [[3]])
-m4_define([b4_error],
-[b4_cat([[@]$1[(]$2[]]dnl
-[m4_if([$#], [2], [],
-       [m4_foreach([b4_arg],
-                   m4_dquote(m4_shift(m4_shift($@))),
-                   [[@,]b4_arg])])[@)]])])
-
-# b4_error_at(KIND, START, END, FORMAT, [ARG1], [ARG2], ...)
-# ----------------------------------------------------------
-# Write @KIND_at(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# For example:
-#
-#   b4_error_at([[complain]], [[input.y:2.3]], [[input.y:5.4]],
-#               [[invalid %s]], [[foo]])
-m4_define([b4_error_at],
-[b4_cat([[@]$1[_at(]$2[@,]$3[@,]$4[]]dnl
-[m4_if([$#], [4], [],
-       [m4_foreach([b4_arg],
-                   m4_dquote(m4_shift(m4_shift(m4_shift(m4_shift($@))))),
-                   [[@,]b4_arg])])[@)]])])
-
-# b4_warn(FORMAT, [ARG1], [ARG2], ...)
-# ------------------------------------
-# Write @warn(FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# For example:
-#
-#   b4_warn([[invalid value for '%s': %s]], [[foo]], [[3]])
-#
-# As a simple test suite, this:
-#
-#   m4_divert(-1)
-#   m4_define([asdf], [ASDF])
-#   m4_define([fsa], [FSA])
-#   m4_define([fdsa], [FDSA])
-#   b4_warn([[[asdf), asdf]]], [[[fsa), fsa]]], [[[fdsa), fdsa]]])
-#   b4_warn([[asdf), asdf]], [[fsa), fsa]], [[fdsa), fdsa]])
-#   b4_warn()
-#   b4_warn(1)
-#   b4_warn(1, 2)
-#
-# Should produce this without newlines:
-#
-#   @warn([asdf), asdf]@,[fsa), fsa]@,[fdsa), fdsa]@)
-#   @warn(asdf), asdf@,fsa), fsa@,fdsa), fdsa@)
-#   @warn(@)
-#   @warn(1@)
-#   @warn(1@,2@)
-m4_define([b4_warn],
-[b4_error([[warn]], $@)])
-
-# b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
-# ---------------------------------------------------
-# Write @warn(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# For example:
-#
-#   b4_warn_at([[input.y:2.3]], [[input.y:5.4]], [[invalid %s]], [[foo]])
-m4_define([b4_warn_at],
-[b4_error_at([[warn]], $@)])
-
-# b4_complain(FORMAT, [ARG1], [ARG2], ...)
-# ----------------------------------------
-# Write @complain(FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# See b4_warn example.
-m4_define([b4_complain],
-[b4_error([[complain]], $@)])
-
-# b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
-# -------------------------------------------------------
-# Write @complain(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout.
-#
-# See b4_warn_at example.
-m4_define([b4_complain_at],
-[b4_error_at([[complain]], $@)])
-
-# b4_fatal(FORMAT, [ARG1], [ARG2], ...)
-# -------------------------------------
-# Write @fatal(FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
-#
-# See b4_warn example.
-m4_define([b4_fatal],
-[b4_error([[fatal]], $@)dnl
-m4_exit(1)])
-
-# b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
-# ----------------------------------------------------
-# Write @fatal(START@,END@,FORMAT@,ARG1@,ARG2@,...@) to stdout and exit.
-#
-# See b4_warn_at example.
-m4_define([b4_fatal_at],
-[b4_error_at([[fatal]], $@)dnl
-m4_exit(1)])
-
-
-## ------------ ##
-## Data Types.  ##
-## ------------ ##
-
-# b4_ints_in(INT1, INT2, LOW, HIGH)
-# ---------------------------------
-# Return 1 iff both INT1 and INT2 are in [LOW, HIGH], 0 otherwise.
-m4_define([b4_ints_in],
-[m4_eval([$3 <= $1 && $1 <= $4 && $3 <= $2 && $2 <= $4])])
-
-
-
-## ------------------ ##
-## Decoding options.  ##
-## ------------------ ##
-
-# b4_flag_if(FLAG, IF-TRUE, IF-FALSE)
-# -----------------------------------
-# Run IF-TRUE if b4_FLAG_flag is 1, IF-FALSE if FLAG is 0, otherwise fail.
-m4_define([b4_flag_if],
-[m4_case(b4_$1_flag,
-         [0], [$3],
-	 [1], [$2],
-	 [m4_fatal([invalid $1 value: ]$1)])])
-
-
-# b4_define_flag_if(FLAG)
-# -----------------------
-# Define "b4_FLAG_if(IF-TRUE, IF-FALSE)" that depends on the
-# value of the Boolean FLAG.
-m4_define([b4_define_flag_if],
-[_b4_define_flag_if($[1], $[2], [$1])])
-
-# _b4_define_flag_if($1, $2, FLAG)
-# --------------------------------
-# Work around the impossibility to define macros inside macros,
-# because issuing `[$1]' is not possible in M4.  GNU M4 should provide
-# $$1 a la M5/TeX.
-m4_define([_b4_define_flag_if],
-[m4_if([$1$2], $[1]$[2], [],
-       [m4_fatal([$0: Invalid arguments: $@])])dnl
-m4_define([b4_$3_if],
-          [b4_flag_if([$3], [$1], [$2])])])
-
-
-# b4_FLAG_if(IF-TRUE, IF-FALSE)
-# -----------------------------
-# Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
-b4_define_flag_if([defines])            # Whether headers are requested.
-b4_define_flag_if([error_verbose])      # Whether error are verbose.
-b4_define_flag_if([glr])                # Whether a GLR parser is requested.
-b4_define_flag_if([locations])          # Whether locations are tracked.
-b4_define_flag_if([nondeterministic])   # Whether conflicts should be handled.
-b4_define_flag_if([token_table])        # Whether yytoken_table is demanded.
-b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
-
-# yytoken_table is needed to support verbose errors.
-b4_error_verbose_if([m4_define([b4_token_table_flag], [1])])
-
-
-
-## ----------- ##
-## Synclines.  ##
-## ----------- ##
-
-# b4_basename(NAME)
-# -----------------
-# Similar to POSIX basename; the differences don't matter here.
-# Beware that NAME is not evaluated.
-m4_define([b4_basename],
-[m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
-
-
-# b4_syncline(LINE, FILE)
-# -----------------------
-m4_define([b4_syncline],
-[b4_flag_if([synclines],
-[b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
-b4_sync_start([$1], [$2])])])
-
-m4_define([b4_sync_end], [b4_comment([Line $1 of $2])])
-m4_define([b4_sync_start], [b4_comment([Line $1 of $2])])
-
-# b4_user_code(USER-CODE)
-# -----------------------
-# Emit code from the user, ending it with synclines.
-m4_define([b4_user_code],
-[$1
-b4_syncline([@oline@], [@ofile@])])
-
-
-# b4_define_user_code(MACRO)
-# --------------------------
-# From b4_MACRO, build b4_user_MACRO that includes the synclines.
-m4_define([b4_define_user_code],
-[m4_define([b4_user_$1],
-[b4_user_code([b4_$1])])])
-
-
-# b4_user_actions
-# b4_user_initial_action
-# b4_user_post_prologue
-# b4_user_pre_prologue
-# b4_user_stype
-# ----------------------
-# Macros that issue user code, ending with synclines.
-b4_define_user_code([actions])
-b4_define_user_code([initial_action])
-b4_define_user_code([post_prologue])
-b4_define_user_code([pre_prologue])
-b4_define_user_code([stype])
-
-
-# b4_check_user_names(WHAT, USER-LIST, BISON-NAMESPACE)
-# -----------------------------------------------------
-# Complain if any name of type WHAT is used by the user (as recorded in
-# USER-LIST) but is not used by Bison (as recorded by macros in the
-# namespace BISON-NAMESPACE).
-#
-# USER-LIST must expand to a list specifying all user occurrences of all names
-# of type WHAT.   Each item in the list must be a triplet specifying one
-# occurrence: name, start boundary, and end boundary.  Empty string names are
-# fine.  An empty list is fine.
-#
-# For example, to define b4_foo_user_names to be used for USER-LIST with three
-# name occurrences and with correct quoting:
-#
-#   m4_define([b4_foo_user_names],
-#             [[[[[[bar]], [[parser.y:1.7]], [[parser.y:1.16]]]],
-#               [[[[bar]], [[parser.y:5.7]], [[parser.y:5.16]]]],
-#               [[[[baz]], [[parser.y:8.7]], [[parser.y:8.16]]]]]])
-#
-# The macro BISON-NAMESPACE(bar) must be defined iff the name bar of type WHAT
-# is used by Bison (in the front-end or in the skeleton).  Empty string names
-# are fine, but it would be ugly for Bison to actually use one.
-#
-# For example, to use b4_foo_bison_names for BISON-NAMESPACE and define that
-# the names bar and baz are used by Bison:
-#
-#   m4_define([b4_foo_bison_names(bar)])
-#   m4_define([b4_foo_bison_names(baz)])
-#
-# To invoke b4_check_user_names with TYPE foo, with USER-LIST
-# b4_foo_user_names, with BISON-NAMESPACE b4_foo_bison_names, and with correct
-# quoting:
-#
-#   b4_check_user_names([[foo]], [b4_foo_user_names],
-#                       [[b4_foo_bison_names]])
-m4_define([b4_check_user_names],
-[m4_foreach([b4_occurrence], $2,
-[m4_pushdef([b4_occurrence], b4_occurrence)dnl
-m4_pushdef([b4_user_name], m4_car(b4_occurrence))dnl
-m4_pushdef([b4_start], m4_car(m4_shift(b4_occurrence)))dnl
-m4_pushdef([b4_end], m4_shift(m4_shift(b4_occurrence)))dnl
-m4_ifndef($3[(]m4_quote(b4_user_name)[)],
-          [b4_complain_at([b4_start], [b4_end],
-                          [[%s '%s' is not used]],
-                          [$1], [b4_user_name])])[]dnl
-m4_popdef([b4_occurrence])dnl
-m4_popdef([b4_user_name])dnl
-m4_popdef([b4_start])dnl
-m4_popdef([b4_end])dnl
-])])
-
-
-
-
-## --------------------- ##
-## b4_percent_define_*.  ##
-## --------------------- ##
-
-
-# b4_percent_define_use(VARIABLE)
-# -------------------------------
-# Declare that VARIABLE was used.
-m4_define([b4_percent_define_use],
-[m4_define([b4_percent_define_bison_variables(]$1[)])dnl
-])
-
-# b4_percent_define_get(VARIABLE, [DEFAULT])
-# ------------------------------------------
-# Mimic muscle_percent_define_get in ../src/muscle-tab.h.  That is, if
-# the %define variable VARIABLE is defined, emit its value.  Contrary
-# to its C counterpart, return DEFAULT otherwise.  Also, record
-# Bison's usage of VARIABLE by defining
-# b4_percent_define_bison_variables(VARIABLE).
-#
-# For example:
-#
-#   b4_percent_define_get([[foo]])
-m4_define([b4_percent_define_get],
-[b4_percent_define_use([$1])dnl
-m4_ifdef([b4_percent_define(]$1[)],
-         [m4_indir([b4_percent_define(]$1[)])],
-         [$2])])
-
-
-# b4_percent_define_get_loc(VARIABLE)
-# -----------------------------------
-# Mimic muscle_percent_define_get_loc in ../src/muscle-tab.h exactly.  That is,
-# if the %define variable VARIABLE is undefined, complain fatally since that's
-# a Bison or skeleton error.  Otherwise, return its definition location in a
-# form approriate for the first two arguments of b4_warn_at, b4_complain_at, or
-# b4_fatal_at.  Don't record this as a Bison usage of VARIABLE as there's no
-# reason to suspect that the user-supplied value has yet influenced the output.
-#
-# For example:
-#
-#   b4_complain_at(b4_percent_define_get_loc([[foo]]), [[invalid foo]])
-m4_define([b4_percent_define_get_loc],
-[m4_ifdef([b4_percent_define_loc(]$1[)],
-          [m4_pushdef([b4_loc], m4_indir([b4_percent_define_loc(]$1[)]))dnl
-b4_loc[]dnl
-m4_popdef([b4_loc])],
-          [b4_fatal([[b4_percent_define_get_loc: undefined %%define variable '%s']], [$1])])])
-
-# b4_percent_define_get_syncline(VARIABLE)
-# ----------------------------------------
-# Mimic muscle_percent_define_get_syncline in ../src/muscle-tab.h exactly.
-# That is, if the %define variable VARIABLE is undefined, complain fatally
-# since that's a Bison or skeleton error.  Otherwise, return its definition
-# location as a b4_syncline invocation.  Don't record this as a Bison usage of
-# VARIABLE as there's no reason to suspect that the user-supplied value has yet
-# influenced the output.
-#
-# For example:
-#
-#   b4_percent_define_get_syncline([[foo]])
-m4_define([b4_percent_define_get_syncline],
-[m4_ifdef([b4_percent_define_syncline(]$1[)],
-          [m4_indir([b4_percent_define_syncline(]$1[)])],
-          [b4_fatal([[b4_percent_define_get_syncline: undefined %%define variable '%s']], [$1])])])
-
-# b4_percent_define_ifdef(VARIABLE, IF-TRUE, [IF-FALSE])
-# ------------------------------------------------------
-# Mimic muscle_percent_define_ifdef in ../src/muscle-tab.h exactly.  That is,
-# if the %define variable VARIABLE is defined, expand IF-TRUE, else expand
-# IF-FALSE.  Also, record Bison's usage of VARIABLE by defining
-# b4_percent_define_bison_variables(VARIABLE).
-#
-# For example:
-#
-#   b4_percent_define_ifdef([[foo]], [[it's defined]], [[it's undefined]])
-m4_define([b4_percent_define_ifdef],
-[m4_ifdef([b4_percent_define(]$1[)],
-	  [m4_define([b4_percent_define_bison_variables(]$1[)])$2],
-	  [$3])])
-
-# b4_percent_define_flag_if(VARIABLE, IF-TRUE, [IF-FALSE])
-# --------------------------------------------------------
-# Mimic muscle_percent_define_flag_if in ../src/muscle-tab.h exactly.  That is,
-# if the %define variable VARIABLE is defined to "" or "true", expand IF-TRUE.
-# If it is defined to "false", expand IF-FALSE.  Complain if it is undefined
-# (a Bison or skeleton error since the default value should have been set
-# already) or defined to any other value (possibly a user error).  Also, record
-# Bison's usage of VARIABLE by defining
-# b4_percent_define_bison_variables(VARIABLE).
-#
-# For example:
-#
-#   b4_percent_define_flag_if([[foo]], [[it's true]], [[it's false]])
-m4_define([b4_percent_define_flag_if],
-[b4_percent_define_ifdef([$1],
-  [m4_case(b4_percent_define_get([$1]),
-           [], [$2], [true], [$2], [false], [$3],
-           [m4_expand_once([b4_complain_at(b4_percent_define_get_loc([$1]),
-                                           [[invalid value for %%define Boolean variable '%s']],
-                                           [$1])],
-                           [[b4_percent_define_flag_if($1)]])])],
-  [b4_fatal([[b4_percent_define_flag_if: undefined %%define variable '%s']], [$1])])])
-
-# b4_percent_define_default(VARIABLE, DEFAULT)
-# --------------------------------------------
-# Mimic muscle_percent_define_default in ../src/muscle-tab.h exactly.  That is,
-# if the %define variable VARIABLE is undefined, set its value to DEFAULT.
-# Don't record this as a Bison usage of VARIABLE as there's no reason to
-# suspect that the value has yet influenced the output.
-#
-# For example:
-#
-#   b4_percent_define_default([[foo]], [[default value]])
-m4_define([b4_percent_define_default],
-[m4_ifndef([b4_percent_define(]$1[)],
-           [m4_define([b4_percent_define(]$1[)], [$2])dnl
-            m4_define([b4_percent_define_loc(]$1[)],
-                      [[[[<skeleton default value>:-1.-1]],
-                        [[<skeleton default value>:-1.-1]]]])dnl
-            m4_define([b4_percent_define_syncline(]$1[)], [[]])])])
-
-# b4_percent_define_check_values(VALUES)
-# --------------------------------------
-# Mimic muscle_percent_define_check_values in ../src/muscle-tab.h exactly
-# except that the VALUES structure is more appropriate for M4.  That is, VALUES
-# is a list of sublists of strings.  For each sublist, the first string is the
-# name of a %define variable, and all remaining strings in that sublist are the
-# valid values for that variable.  Complain if such a variable is undefined (a
-# Bison error since the default value should have been set already) or defined
-# to any other value (possibly a user error).  Don't record this as a Bison
-# usage of the variable as there's no reason to suspect that the value has yet
-# influenced the output.
-#
-# For example:
-#
-#   b4_percent_define_check_values([[[[foo]], [[foo-value1]], [[foo-value2]]]],
-#                                  [[[[bar]], [[bar-value1]]]])
-m4_define([b4_percent_define_check_values],
-[m4_foreach([b4_sublist], m4_quote($@),
-            [_b4_percent_define_check_values(b4_sublist)])])
-
-m4_define([_b4_percent_define_check_values],
-[m4_ifdef([b4_percent_define(]$1[)],
-  [m4_pushdef([b4_good_value], [0])dnl
-   m4_if($#, 1, [],
-         [m4_foreach([b4_value], m4_dquote(m4_shift($@)),
-                     [m4_if(m4_indir([b4_percent_define(]$1[)]), b4_value,
-                            [m4_define([b4_good_value], [1])])])])dnl
-   m4_if(b4_good_value, [0],
-         [b4_complain_at(b4_percent_define_get_loc([$1]),
-                         [[invalid value for %%define variable '%s': '%s']],
-                         [$1],
-                         m4_dquote(m4_indir([b4_percent_define(]$1[)])))
-          m4_foreach([b4_value], m4_dquote(m4_shift($@)),
-                     [b4_complain_at(b4_percent_define_get_loc([$1]),
-                                     [[accepted value: '%s']],
-                                     m4_dquote(b4_value))])])dnl
-   m4_popdef([b4_good_value])],
-  [b4_fatal([[b4_percent_define_check_values: undefined %%define variable '%s']], [$1])])])
-
-# b4_percent_code_get([QUALIFIER])
-# --------------------------------
-# If any %code blocks for QUALIFIER are defined, emit them beginning with a
-# comment and ending with synclines and a newline.  If QUALIFIER is not
-# specified or empty, do this for the unqualified %code blocks.  Also, record
-# Bison's usage of QUALIFIER (if specified) by defining
-# b4_percent_code_bison_qualifiers(QUALIFIER).
-#
-# For example, to emit any unqualified %code blocks followed by any %code
-# blocks for the qualifier foo:
-#
-#   b4_percent_code_get
-#   b4_percent_code_get([[foo]])
-m4_define([b4_percent_code_get],
-[m4_pushdef([b4_macro_name], [[b4_percent_code(]$1[)]])dnl
-m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])dnl
-m4_ifdef(b4_macro_name,
-[b4_comment([m4_if([$#], [0], [[Unqualified %code]],
-                   [["%code ]$1["]])[ blocks.]])
-b4_user_code([m4_indir(b4_macro_name)])
-])dnl
-m4_popdef([b4_macro_name])])
-
-# b4_percent_code_ifdef(QUALIFIER, IF-TRUE, [IF-FALSE])
-# -----------------------------------------------------
-# If any %code blocks for QUALIFIER (or unqualified %code blocks if
-# QUALIFIER is empty) are defined, expand IF-TRUE, else expand IF-FALSE.
-# Also, record Bison's usage of QUALIFIER (if specified) by defining
-# b4_percent_code_bison_qualifiers(QUALIFIER).
-m4_define([b4_percent_code_ifdef],
-[m4_ifdef([b4_percent_code(]$1[)],
-          [m4_ifval([$1], [m4_define([b4_percent_code_bison_qualifiers(]$1[)])])$2],
-	  [$3])])
-
-
-## ----------------------------------------------------------- ##
-## After processing the skeletons, check that all the user's   ##
-## %define variables and %code qualifiers were used by Bison.  ##
-## ----------------------------------------------------------- ##
-
-m4_define([b4_check_user_names_wrap],
-[m4_ifdef([b4_percent_]$1[_user_]$2[s],
-          [b4_check_user_names([[%]$1 $2],
-                               [b4_percent_]$1[_user_]$2[s],
-                               [[b4_percent_]$1[_bison_]$2[s]])])])
-
-m4_wrap_lifo([
-b4_check_user_names_wrap([[define]], [[variable]])
-b4_check_user_names_wrap([[code]], [[qualifier]])
-])
-
-
-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
-
-# m4_define_default([b4_lex_param], [])   dnl breaks other skeletons
-m4_define_default([b4_pre_prologue], [])
-m4_define_default([b4_post_prologue], [])
-m4_define_default([b4_epilogue], [])
-m4_define_default([b4_parse_param], [])
-
-# The initial column and line.
-m4_define_default([b4_location_initial_column], [1])
-m4_define_default([b4_location_initial_line],   [1])
-
-# Sanity checks.
-b4_percent_define_ifdef([api.prefix],
-[m4_ifdef([b4_prefix],
-[b4_complain_at(b4_percent_define_get_loc([api.prefix]),
-                [['%s' and '%s' cannot be used together]],
-                [%name-prefix],
-                [%define api.prefix])])])

data/c++.m4

@@ -1,205 +0,0 @@
-                                                            -*- Autoconf -*-
-
-# C++ skeleton for Bison
-
-# Copyright (C) 2002-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-m4_include(b4_pkgdatadir/[c.m4])
-
-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
-
-# Default parser class name.
-b4_percent_define_default([[parser_class_name]], [[parser]])
-
-# Don't do that so that we remember whether we're using a user
-# request, or the default value.
-#
-# b4_percent_define_default([[location_type]], [[location]])
-
-b4_percent_define_default([[filename_type]], [[std::string]])
-b4_percent_define_default([[namespace]], m4_defn([b4_prefix]))
-b4_percent_define_default([[global_tokens_and_yystype]], [[false]])
-b4_percent_define_default([[define_location_comparison]],
-                          [m4_if(b4_percent_define_get([[filename_type]]),
-                                 [std::string], [[true]], [[false]])])
-
-
-## ----------- ##
-## Namespace.  ##
-## ----------- ##
-
-m4_define([b4_namespace_ref], [b4_percent_define_get([[namespace]])])
-
-# Don't permit an empty b4_namespace_ref.  Any `::parser::foo' appended to it
-# would compile as an absolute reference with `parser' in the global namespace.
-# b4_namespace_open would open an anonymous namespace and thus establish
-# internal linkage.  This would compile.  However, it's cryptic, and internal
-# linkage for the parser would be specified in all translation units that
-# include the header, which is always generated.  If we ever need to permit
-# internal linkage somehow, surely we can find a cleaner approach.
-m4_if(m4_bregexp(b4_namespace_ref, [^[	 ]*$]), [-1], [],
-[b4_complain_at(b4_percent_define_get_loc([[namespace]]),
-                [[namespace reference is empty]])])
-
-# Instead of assuming the C++ compiler will do it, Bison should reject any
-# invalid b4_namepsace_ref that would be converted to a valid
-# b4_namespace_open.  The problem is that Bison doesn't always output
-# b4_namespace_ref to uncommented code but should reserve the ability to do so
-# in future releases without risking breaking any existing user grammars.
-# Specifically, don't allow empty names as b4_namespace_open would just convert
-# those into anonymous namespaces, and that might tempt some users.
-m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*::]), [-1], [],
-[b4_complain_at(b4_percent_define_get_loc([[namespace]]),
-                [[namespace reference has consecutive "::"]])])
-m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*$]), [-1], [],
-[b4_complain_at(b4_percent_define_get_loc([[namespace]]),
-                [[namespace reference has a trailing "::"]])])
-
-m4_define([b4_namespace_open],
-[b4_user_code([b4_percent_define_get_syncline([[namespace]])
-[namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
-                                                [^\(.\)[	 ]*::], [\1])),
-                         [::], [ { namespace ])[ {]])])
-
-m4_define([b4_namespace_close],
-[b4_user_code([b4_percent_define_get_syncline([[namespace]])
-m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
-                                    [^\(.\)[	 ]*\(::\)?\([^][:]\|:[^:]\)*],
-                                    [\1])),
-             [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])
-
-
-# b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
-# -----------------------------------------------------
-# Output the definition of the tokens as enums.
-m4_define([b4_token_enums],
-[/* Tokens.  */
-   enum yytokentype {
-m4_map_sep([     b4_token_enum], [,
-],
-           [$@])
-   };
-])
-
-
-
-
-## ----------------- ##
-## Semantic Values.  ##
-## ----------------- ##
-
-
-# b4_lhs_value([TYPE])
-# --------------------
-# Expansion of $<TYPE>$.
-m4_define([b4_lhs_value],
-[(yyval[]m4_ifval([$1], [.$1]))])
-
-
-# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
-# --------------------------------------
-# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
-# symbols on RHS.
-m4_define([b4_rhs_value],
-[(yysemantic_stack_@{($1) - ($2)@}m4_ifval([$3], [.$3]))])
-
-# b4_lhs_location()
-# -----------------
-# Expansion of @$.
-m4_define([b4_lhs_location],
-[(yyloc)])
-
-
-# b4_rhs_location(RULE-LENGTH, NUM)
-# ---------------------------------
-# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
-# on RHS.
-m4_define([b4_rhs_location],
-[(yylocation_stack_@{($1) - ($2)@})])
-
-
-# b4_parse_param_decl
-# -------------------
-# Extra formal arguments of the constructor.
-# Change the parameter names from "foo" into "foo_yyarg", so that
-# there is no collision bw the user chosen attribute name, and the
-# argument name in the constructor.
-m4_define([b4_parse_param_decl],
-[m4_ifset([b4_parse_param],
-          [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])])
-
-m4_define([b4_parse_param_decl_1],
-[$1_yyarg])
-
-
-
-# b4_parse_param_cons
-# -------------------
-# Extra initialisations of the constructor.
-m4_define([b4_parse_param_cons],
-          [m4_ifset([b4_parse_param],
-		    [
-      b4_cc_constructor_calls(b4_parse_param)])])
-m4_define([b4_cc_constructor_calls],
-	  [m4_map_sep([b4_cc_constructor_call], [,
-      ], [$@])])
-m4_define([b4_cc_constructor_call],
-	  [$2 ($2_yyarg)])
-
-# b4_parse_param_vars
-# -------------------
-# Extra instance variables.
-m4_define([b4_parse_param_vars],
-          [m4_ifset([b4_parse_param],
-		    [
-    /* User arguments.  */
-b4_cc_var_decls(b4_parse_param)])])
-m4_define([b4_cc_var_decls],
-	  [m4_map_sep([b4_cc_var_decl], [
-], [$@])])
-m4_define([b4_cc_var_decl],
-	  [    $1;])
-
-
-## ---------##
-## Values.  ##
-## ---------##
-
-# b4_yylloc_default_define
-# ------------------------
-# Define YYLLOC_DEFAULT.
-m4_define([b4_yylloc_default_define],
-[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
-# ifndef YYLLOC_DEFAULT
-#  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
-    do                                                                  \
-      if (N)                                                            \
-        {                                                               \
-          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
-          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
-        }                                                               \
-      else                                                              \
-        {                                                               \
-          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
-        }                                                               \
-    while (/*CONSTCOND*/ false)
-# endif
-]])

data/c-like.m4

@@ -1,44 +0,0 @@
-                                                            -*- Autoconf -*-
-
-# Common code for C-like languages (C, C++, Java, etc.)
-
-# Copyright (C) 2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# b4_dollar_dollar_(VALUE, FIELD, DEFAULT-FIELD)
-# ----------------------------------------------
-# If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
-# otherwise just VALUE.  Be sure to pass "(VALUE)" is VALUE is a
-# pointer.
-m4_define([b4_dollar_dollar_],
-[m4_if([$2], [[]],
-       [m4_ifval([$3], [($1.$3)],
-                 [$1])],
-       [($1.$2)])])
-
-# b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION)
-# b4_dollar_popdef
-# ---------------------------------------------------------
-# Define b4_dollar_dollar for VALUE and DEFAULT-FIELD,
-# and b4_at_dollar for LOCATION.
-m4_define([b4_dollar_pushdef],
-[m4_pushdef([b4_dollar_dollar],
-            [b4_dollar_dollar_([$1], m4_dquote($][1), [$2])])dnl
-m4_pushdef([b4_at_dollar], [$3])dnl
-])
-m4_define([b4_dollar_popdef],
-[m4_popdef([b4_at_dollar])dnl
-m4_popdef([b4_dollar_dollar])dnl
-])

data/c.m4

@@ -1,645 +0,0 @@
-                                                            -*- Autoconf -*-
-
-# C M4 Macros for Bison.
-
-# Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-m4_include(b4_pkgdatadir/[c-like.m4])
-
-# b4_tocpp(STRING)
-# ----------------
-# Convert STRING into a valid C macro name.
-m4_define([b4_tocpp],
-[m4_toupper(m4_bpatsubst(m4_quote($1), [[^a-zA-Z0-9]+], [_]))])
-
-
-# b4_cpp_guard(FILE)
-# ------------------
-# A valid C macro name to use as a CPP header guard for FILE.
-m4_define([b4_cpp_guard],
-[[YY_]b4_tocpp(m4_defn([b4_prefix])/[$1])[_INCLUDED]])
-
-
-# b4_cpp_guard_open(FILE)
-# b4_cpp_guard_close(FILE)
-# ------------------------
-# If FILE does not expand to nothing, open/close CPP inclusion guards for FILE.
-m4_define([b4_cpp_guard_open],
-[m4_ifval(m4_quote($1),
-[#ifndef b4_cpp_guard([$1])
-# define b4_cpp_guard([$1])])])
-
-m4_define([b4_cpp_guard_close],
-[m4_ifval(m4_quote($1),
-[#endif b4_comment([!b4_cpp_guard([$1])])])])
-
-
-## ---------------- ##
-## Identification.  ##
-## ---------------- ##
-
-# b4_comment(TEXT)
-# ----------------
-m4_define([b4_comment], [/* m4_bpatsubst([$1], [
-], [
-   ])  */])
-
-# b4_identification
-# -----------------
-# Depends on individual skeletons to define b4_pure_flag, b4_push_flag, or
-# b4_pull_flag if they use the values of the %define variables api.pure or
-# api.push-pull.
-m4_define([b4_identification],
-[[/* Identify Bison output.  */
-#define YYBISON 1
-
-/* Bison version.  */
-#define YYBISON_VERSION "]b4_version["
-
-/* Skeleton name.  */
-#define YYSKELETON_NAME ]b4_skeleton[]m4_ifdef([b4_pure_flag], [[
-
-/* Pure parsers.  */
-#define YYPURE ]b4_pure_flag])[]m4_ifdef([b4_push_flag], [[
-
-/* Push parsers.  */
-#define YYPUSH ]b4_push_flag])[]m4_ifdef([b4_pull_flag], [[
-
-/* Pull parsers.  */
-#define YYPULL ]b4_pull_flag])[
-]])
-
-
-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
-
-# b4_api_prefix, b4_api_PREFIX
-# ----------------------------
-# Corresponds to %define api.prefix
-b4_percent_define_default([[api.prefix]], [[yy]])
-m4_define([b4_api_prefix],
-[b4_percent_define_get([[api.prefix]])])
-m4_define([b4_api_PREFIX],
-[m4_toupper(b4_api_prefix)])
-
-
-# b4_prefix
-# ---------
-# If the %name-prefix is not given, it is api.prefix.
-m4_define_default([b4_prefix], [b4_api_prefix])
-
-# If the %union is not named, its name is YYSTYPE.
-m4_define_default([b4_union_name], [b4_api_PREFIX[]STYPE])
-
-
-## ------------------------ ##
-## Pure/impure interfaces.  ##
-## ------------------------ ##
-
-# b4_user_args
-# ------------
-m4_define([b4_user_args],
-[m4_ifset([b4_parse_param], [, b4_c_args(b4_parse_param)])])
-
-
-# b4_parse_param
-# --------------
-# If defined, b4_parse_param arrives double quoted, but below we prefer
-# it to be single quoted.
-m4_define([b4_parse_param],
-b4_parse_param)
-
-
-# b4_parse_param_for(DECL, FORMAL, BODY)
-# ---------------------------------------
-# Iterate over the user parameters, binding the declaration to DECL,
-# the formal name to FORMAL, and evaluating the BODY.
-m4_define([b4_parse_param_for],
-[m4_foreach([$1_$2], m4_defn([b4_parse_param]),
-[m4_pushdef([$1], m4_unquote(m4_car($1_$2)))dnl
-m4_pushdef([$2], m4_shift($1_$2))dnl
-$3[]dnl
-m4_popdef([$2])dnl
-m4_popdef([$1])dnl
-])])
-
-# b4_parse_param_use
-# ------------------
-# `YYUSE' all the parse-params.
-m4_define([b4_parse_param_use],
-[b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
-])dnl
-])
-
-
-## ------------ ##
-## Data Types.  ##
-## ------------ ##
-
-# b4_int_type(MIN, MAX)
-# ---------------------
-# Return the smallest int type able to handle numbers ranging from
-# MIN to MAX (included).
-m4_define([b4_int_type],
-[m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
-       b4_ints_in($@,   [-128],   [127]), [1], [signed char],
-
-       b4_ints_in($@,      [0], [65535]), [1], [unsigned short int],
-       b4_ints_in($@, [-32768], [32767]), [1], [short int],
-
-       m4_eval([0 <= $1]),                [1], [unsigned int],
-
-					       [int])])
-
-
-# b4_int_type_for(NAME)
-# ---------------------
-# Return the smallest int type able to handle numbers ranging from
-# `NAME_min' to `NAME_max' (included).
-m4_define([b4_int_type_for],
-[b4_int_type($1_min, $1_max)])
-
-
-# b4_table_value_equals(TABLE, VALUE, LITERAL)
-# --------------------------------------------
-# Without inducing a comparison warning from the compiler, check if the
-# literal value LITERAL equals VALUE from table TABLE, which must have
-# TABLE_min and TABLE_max defined.  YYID must be defined as an identity
-# function that suppresses warnings about constant conditions.
-m4_define([b4_table_value_equals],
-[m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
-               || m4_indir([b4_]$1[_max]) < $3), [1],
-       [[YYID (0)]],
-       [(!!(($2) == ($3)))])])
-
-
-## ---------##
-## Values.  ##
-## ---------##
-
-
-# b4_null_define
-# --------------
-# Portability issues: define a YY_NULL appropriate for the current
-# language (C, C++98, or C++11).
-m4_define([b4_null_define],
-[# ifndef YY_NULL
-#  if defined __cplusplus && 201103L <= __cplusplus
-#   define YY_NULL nullptr
-#  else
-#   define YY_NULL 0
-#  endif
-# endif[]dnl
-])
-
-
-# b4_null
-# -------
-# Return a null pointer constant.
-m4_define([b4_null], [YY_NULL])
-
-
-
-## ------------------------- ##
-## Assigning token numbers.  ##
-## ------------------------- ##
-
-# b4_token_define(TOKEN-NAME, TOKEN-NUMBER)
-# -----------------------------------------
-# Output the definition of this token as #define.
-m4_define([b4_token_define],
-[#define $1 $2
-])
-
-
-# b4_token_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
-# -------------------------------------------------------
-# Output the definition of the tokens (if there are) as #defines.
-m4_define([b4_token_defines],
-[m4_if([$#$1], [1], [],
-[/* Tokens.  */
-m4_map([b4_token_define], [$@])])
-])
-
-
-# b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
-# ---------------------------------------
-# Output the definition of this token as an enum.
-m4_define([b4_token_enum],
-[$1 = $2])
-
-
-# b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
-# -----------------------------------------------------
-# Output the definition of the tokens (if there are) as enums.
-m4_define([b4_token_enums],
-[m4_if([$#$1], [1], [],
-[[/* Tokens.  */
-#ifndef ]b4_api_PREFIX[TOKENTYPE
-# define ]b4_api_PREFIX[TOKENTYPE
-   /* Put the tokens into the symbol table, so that GDB and other debuggers
-      know about them.  */
-   enum ]b4_api_prefix[tokentype {
-]m4_map_sep([     b4_token_enum], [,
-],
-	   [$@])[
-   };
-#endif
-]])])
-
-
-# b4_token_enums_defines(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
-# -------------------------------------------------------------
-# Output the definition of the tokens (if there are any) as enums and, if POSIX
-# Yacc is enabled, as #defines.
-m4_define([b4_token_enums_defines],
-[b4_token_enums($@)b4_yacc_if([b4_token_defines($@)], [])
-])
-
-
-
-## --------------------------------------------- ##
-## Defining C functions in both K&R and ANSI-C.  ##
-## --------------------------------------------- ##
-
-
-# b4_modern_c
-# -----------
-# A predicate useful in #if to determine whether C is ancient or modern.
-#
-# If __STDC__ is defined, the compiler is modern.  IBM xlc 7.0 when run
-# as 'cc' doesn't define __STDC__ (or __STDC_VERSION__) for pedantic
-# reasons, but it defines __C99__FUNC__ so check that as well.
-# Microsoft C normally doesn't define these macros, but it defines _MSC_VER.
-# Consider a C++ compiler to be modern if it defines __cplusplus.
-#
-m4_define([b4_c_modern],
-  [[(defined __STDC__ || defined __C99__FUNC__ \
-     || defined __cplusplus || defined _MSC_VER)]])
-
-# b4_c_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
-# ----------------------------------------------------------
-# Declare the function NAME.
-m4_define([b4_c_function_def],
-[#if b4_c_modern
-b4_c_ansi_function_def($@)
-#else
-$2
-$1 (b4_c_knr_formal_names(m4_shift2($@)))
-b4_c_knr_formal_decls(m4_shift2($@))
-#endif[]dnl
-])
-
-
-# b4_c_ansi_function_def(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
-# ---------------------------------------------------------------
-# Declare the function NAME in ANSI.
-m4_define([b4_c_ansi_function_def],
-[$2
-$1 (b4_c_ansi_formals(m4_shift2($@)))[]dnl
-])
-
-
-# b4_c_ansi_formals([DECL1, NAME1], ...)
-# --------------------------------------
-# Output the arguments ANSI-C definition.
-m4_define([b4_c_ansi_formals],
-[m4_if([$#], [0], [void],
-       [$#$1], [1], [void],
-	       [m4_map_sep([b4_c_ansi_formal], [, ], [$@])])])
-
-m4_define([b4_c_ansi_formal],
-[$1])
-
-
-# b4_c_knr_formal_names([DECL1, NAME1], ...)
-# ------------------------------------------
-# Output the argument names.
-m4_define([b4_c_knr_formal_names],
-[m4_map_sep([b4_c_knr_formal_name], [, ], [$@])])
-
-m4_define([b4_c_knr_formal_name],
-[$2])
-
-
-# b4_c_knr_formal_decls([DECL1, NAME1], ...)
-# ------------------------------------------
-# Output the K&R argument declarations.
-m4_define([b4_c_knr_formal_decls],
-[m4_map_sep([b4_c_knr_formal_decl],
-	    [
-],
-	    [$@])])
-
-m4_define([b4_c_knr_formal_decl],
-[    $1;])
-
-
-
-## ------------------------------------------------------------ ##
-## Declaring (prototyping) C functions in both K&R and ANSI-C.  ##
-## ------------------------------------------------------------ ##
-
-
-# b4_c_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
-# -----------------------------------------------------------
-# Declare the function NAME.
-m4_define([b4_c_function_decl],
-[#if defined __STDC__ || defined __cplusplus
-b4_c_ansi_function_decl($@)
-#else
-$2 $1 ();
-#endif[]dnl
-])
-
-
-# b4_c_ansi_function_decl(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
-# ----------------------------------------------------------------
-# Declare the function NAME.
-m4_define([b4_c_ansi_function_decl],
-[$2 $1 (b4_c_ansi_formals(m4_shift2($@)));[]dnl
-])
-
-
-
-
-## --------------------- ##
-## Calling C functions.  ##
-## --------------------- ##
-
-
-# b4_c_function_call(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
-# -----------------------------------------------------------
-# Call the function NAME with arguments NAME1, NAME2 etc.
-m4_define([b4_c_function_call],
-[$1 (b4_c_args(m4_shift2($@)))[]dnl
-])
-
-
-# b4_c_args([DECL1, NAME1], ...)
-# ------------------------------
-# Output the arguments NAME1, NAME2...
-m4_define([b4_c_args],
-[m4_map_sep([b4_c_arg], [, ], [$@])])
-
-m4_define([b4_c_arg],
-[$2])
-
-
-## ----------- ##
-## Synclines.  ##
-## ----------- ##
-
-# b4_sync_start(LINE, FILE)
-# -----------------------
-m4_define([b4_sync_start], [[#]line $1 $2])
-
-
-## -------------- ##
-## User actions.  ##
-## -------------- ##
-
-# b4_case(LABEL, STATEMENTS)
-# --------------------------
-m4_define([b4_case],
-[  case $1:
-$2
-    break;])
-
-# b4_symbol_actions(FILENAME, LINENO,
-#                   SYMBOL-TAG, SYMBOL-NUM,
-#                   SYMBOL-ACTION, SYMBOL-TYPENAME)
-# -------------------------------------------------
-# Issue the code for a symbol action (e.g., %printer).
-#
-# Define b4_dollar_dollar([TYPE-NAME]), and b4_at_dollar, which are
-# invoked where $<TYPE-NAME>$ and @$ were specified by the user.
-m4_define([b4_symbol_actions],
-[b4_dollar_pushdef([(*yyvaluep)], [$6], [(*yylocationp)])dnl
-      case $4: /* $3 */
-b4_syncline([$2], [$1])
-	$5;
-b4_syncline([@oline@], [@ofile@])
-	break;
-b4_dollar_popdef[]dnl
-])
-
-
-# b4_yydestruct_generate(FUNCTION-DECLARATOR)
-# -------------------------------------------
-# Generate the "yydestruct" function, which declaration is issued using
-# FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
-# or "b4_c_function_def" for K&R.
-m4_define_default([b4_yydestruct_generate],
-[[/*-----------------------------------------------.
-| Release the memory associated to this symbol.  |
-`-----------------------------------------------*/
-
-/*ARGSUSED*/
-]$1([yydestruct],
-    [static void],
-    [[const char *yymsg],    [yymsg]],
-    [[int yytype],           [yytype]],
-    [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
-b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
-m4_ifset([b4_parse_param], [, b4_parse_param]))[
-{
-  YYUSE (yyvaluep);
-]b4_locations_if([  YYUSE (yylocationp);
-])dnl
-b4_parse_param_use[]dnl
-[
-  if (!yymsg)
-    yymsg = "Deleting";
-  YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
-
-  switch (yytype)
-    {
-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_destructors]))[
-      default:
-	break;
-    }
-}]dnl
-])
-
-
-# b4_yy_symbol_print_generate(FUNCTION-DECLARATOR)
-# ------------------------------------------------
-# Generate the "yy_symbol_print" function, which declaration is issued using
-# FUNCTION-DECLARATOR, which may be "b4_c_ansi_function_def" for ISO C
-# or "b4_c_function_def" for K&R.
-m4_define_default([b4_yy_symbol_print_generate],
-[[
-/*--------------------------------.
-| Print this symbol on YYOUTPUT.  |
-`--------------------------------*/
-
-/*ARGSUSED*/
-]$1([yy_symbol_value_print],
-    [static void],
-	       [[FILE *yyoutput],                       [yyoutput]],
-	       [[int yytype],                           [yytype]],
-	       [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
-b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
-m4_ifset([b4_parse_param], [, b4_parse_param]))[
-{
-  FILE *yyo = yyoutput;
-  YYUSE (yyo);
-  if (!yyvaluep)
-    return;
-]b4_locations_if([  YYUSE (yylocationp);
-])dnl
-b4_parse_param_use[]dnl
-[# ifdef YYPRINT
-  if (yytype < YYNTOKENS)
-    YYPRINT (yyoutput, yytoknum[yytype], *yyvaluep);
-# else
-  YYUSE (yyoutput);
-# endif
-  switch (yytype)
-    {
-]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
-[      default:
-	break;
-    }
-}
-
-
-/*--------------------------------.
-| Print this symbol on YYOUTPUT.  |
-`--------------------------------*/
-
-]$1([yy_symbol_print],
-    [static void],
-	       [[FILE *yyoutput],                       [yyoutput]],
-	       [[int yytype],                           [yytype]],
-	       [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
-b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
-m4_ifset([b4_parse_param], [, b4_parse_param]))[
-{
-  if (yytype < YYNTOKENS)
-    YYFPRINTF (yyoutput, "token %s (", yytname[yytype]);
-  else
-    YYFPRINTF (yyoutput, "nterm %s (", yytname[yytype]);
-
-]b4_locations_if([  YY_LOCATION_PRINT (yyoutput, *yylocationp);
-  YYFPRINTF (yyoutput, ": ");
-])dnl
-[  yy_symbol_value_print (yyoutput, yytype, yyvaluep]dnl
-b4_locations_if([, yylocationp])[]b4_user_args[);
-  YYFPRINTF (yyoutput, ")");
-}]dnl
-])
-
-## -------------- ##
-## Declarations.  ##
-## -------------- ##
-
-# b4_declare_yylstype
-# -------------------
-# Declarations that might either go into the header (if --defines) or
-# in the parser body.  Declare YYSTYPE/YYLTYPE, and yylval/yylloc.
-m4_define([b4_declare_yylstype],
-[[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
-]m4_ifdef([b4_stype],
-[[typedef union ]b4_union_name[
-{
-]b4_user_stype[
-} ]b4_api_PREFIX[STYPE;
-# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]],
-[m4_if(b4_tag_seen_flag, 0,
-[[typedef int ]b4_api_PREFIX[STYPE;
-# define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1]])])[
-# define ]b4_api_prefix[stype ]b4_api_PREFIX[STYPE /* obsolescent; will be withdrawn */
-# define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
-#endif]b4_locations_if([[
-
-#if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
-typedef struct ]b4_api_PREFIX[LTYPE
-{
-  int first_line;
-  int first_column;
-  int last_line;
-  int last_column;
-} ]b4_api_PREFIX[LTYPE;
-# define ]b4_api_prefix[ltype ]b4_api_PREFIX[LTYPE /* obsolescent; will be withdrawn */
-# define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
-# define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
-#endif]])
-
-b4_pure_if([], [[extern ]b4_api_PREFIX[STYPE ]b4_prefix[lval;
-]b4_locations_if([[extern ]b4_api_PREFIX[LTYPE ]b4_prefix[lloc;]])])[]dnl
-])
-
-# b4_YYDEBUG_define
-# ------------------
-m4_define([b4_YYDEBUG_define],
-[[/* Enabling traces.  */
-]m4_if(b4_api_prefix, [yy],
-[[#ifndef YYDEBUG
-# define YYDEBUG ]b4_debug_flag[
-#endif]],
-[[#ifndef ]b4_api_PREFIX[DEBUG
-# if defined YYDEBUG
-#  if YYDEBUG
-#   define ]b4_api_PREFIX[DEBUG 1
-#  else
-#   define ]b4_api_PREFIX[DEBUG 0
-#  endif
-# else /* ! defined YYDEBUG */
-#  define ]b4_api_PREFIX[DEBUG ]b4_debug_flag[
-# endif /* ! defined ]b4_api_PREFIX[DEBUG */
-#endif  /* ! defined ]b4_api_PREFIX[DEBUG */]])[]dnl
-])
-
-# b4_declare_yydebug
-# ------------------
-m4_define([b4_declare_yydebug],
-[b4_YYDEBUG_define[
-#if ]b4_api_PREFIX[DEBUG
-extern int ]b4_prefix[debug;
-#endif][]dnl
-])
-
-# b4_yylloc_default_define
-# ------------------------
-# Define YYLLOC_DEFAULT.
-m4_define([b4_yylloc_default_define],
-[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
-   If N is 0, then set CURRENT to the empty location which ends
-   the previous symbol: RHS[0] (always defined).  */
-
-#ifndef YYLLOC_DEFAULT
-# define YYLLOC_DEFAULT(Current, Rhs, N)                                \
-    do                                                                  \
-      if (YYID (N))                                                     \
-        {                                                               \
-          (Current).first_line   = YYRHSLOC (Rhs, 1).first_line;        \
-          (Current).first_column = YYRHSLOC (Rhs, 1).first_column;      \
-          (Current).last_line    = YYRHSLOC (Rhs, N).last_line;         \
-          (Current).last_column  = YYRHSLOC (Rhs, N).last_column;       \
-        }                                                               \
-      else                                                              \
-        {                                                               \
-          (Current).first_line   = (Current).last_line   =              \
-            YYRHSLOC (Rhs, 0).last_line;                                \
-          (Current).first_column = (Current).last_column =              \
-            YYRHSLOC (Rhs, 0).last_column;                              \
-        }                                                               \
-    while (YYID (0))
-#endif
-]])

data/glr.cc

@@ -1,342 +0,0 @@
-                                                                    -*- C -*-
-
-# C++ GLR skeleton for Bison
-
-# Copyright (C) 2002-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-# This skeleton produces a C++ class that encapsulates a C glr parser.
-# This is in order to reduce the maintenance burden.  The glr.c
-# skeleton is clean and pure enough so that there are no real
-# problems.  The C++ interface is the same as that of lalr1.cc.  In
-# fact, glr.c can replace yacc.c without the user noticing any
-# difference, and similarly for glr.cc replacing lalr1.cc.
-#
-# The passing of parse-params
-#
-#   The additional arguments are stored as members of the parser
-#   object, yyparser.  The C routines need to carry yyparser
-#   throughout the C parser; that easy: just let yyparser become an
-#   additional parse-param.  But because the C++ skeleton needs to
-#   know the "real" original parse-param, we save them
-#   (b4_parse_param_orig).  Note that b4_parse_param is overquoted
-#   (and c.m4 strips one level of quotes).  This is a PITA, and
-#   explains why there are so many levels of quotes.
-#
-# The locations
-#
-#   We use location.cc just like lalr1.cc, but because glr.c stores
-#   the locations in a (C++) union, the position and location classes
-#   must not have a constructor.  Therefore, contrary to lalr1.cc, we
-#   must not define "b4_location_constructors".  As a consequence the
-#   user must initialize the first positions (in particular the
-#   filename member).
-
-# We require a pure interface using locations.
-m4_define([b4_locations_flag], [1])
-m4_define([b4_pure_flag],      [1])
-
-# The header is mandatory.
-b4_defines_if([],
-              [b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
-
-m4_include(b4_pkgdatadir/[c++.m4])
-b4_percent_define_ifdef([[location_type]], [],
-                        [m4_include(b4_pkgdatadir/[location.cc])])
-
-m4_define([b4_parser_class_name],
-          [b4_percent_define_get([[parser_class_name]])])
-
-# Save the parse parameters.
-m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
-
-
-# b4_yy_symbol_print_generate
-# ---------------------------
-# Bypass the default implementation to generate the "yy_symbol_print"
-# and "yy_symbol_value_print" functions.
-m4_define([b4_yy_symbol_print_generate],
-[[
-/*--------------------.
-| Print this symbol.  |
-`--------------------*/
-
-]b4_c_ansi_function_def([yy_symbol_print],
-    [static void],
-    [[FILE *],               []],
-    [[int yytype],           [yytype]],
-    [[const ]b4_namespace_ref::b4_parser_class_name[::semantic_type *yyvaluep],
-                             [yyvaluep]],
-    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
-                             [yylocationp]],
-    b4_parse_param)[
-{
-]b4_parse_param_use[]dnl
-[  yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
-}
-]])
-
-
-# Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
-# and declaration of yyerror.
-m4_append([b4_post_prologue],
-[b4_syncline([@oline@], [@ofile@])[
-]b4_yylloc_default_define[
-#define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
-]b4_c_ansi_function_decl([yyerror],
-    [static void],
-    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
-                        [yylocationp]],
-    b4_parse_param,
-    [[const char* msg], [msg]])])
-
-
-# Hijack the epilogue to define implementations (yyerror, parser member
-# functions etc.).
-m4_append([b4_epilogue],
-[b4_syncline([@oline@], [@ofile@])[
-/*------------------.
-| Report an error.  |
-`------------------*/
-
-]b4_c_ansi_function_def([yyerror],
-    [static void],
-    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
-                        [yylocationp]],
-    b4_parse_param,
-    [[const char* msg], [msg]])[
-{
-]b4_parse_param_use[]dnl
-[  yyparser.error (*yylocationp, msg);
-}
-
-
-]b4_namespace_open[
-]dnl In this section, the parse param are the original parse_params.
-m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
-[  /// Build a parser object.
-  ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
-    :])[
-#if ]b4_api_PREFIX[DEBUG
-    ]m4_ifset([b4_parse_param], [  ], [ :])[
-      yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
-#endif]b4_parse_param_cons[
-  {
-  }
-
-  ]b4_parser_class_name::~b4_parser_class_name[ ()
-  {
-  }
-
-  int
-  ]b4_parser_class_name[::parse ()
-  {
-    return ::yyparse (*this]b4_user_args[);
-  }
-
-#if ]b4_api_PREFIX[DEBUG
-  /*--------------------.
-  | Print this symbol.  |
-  `--------------------*/
-
-  inline void
-  ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
-                           const semantic_type* yyvaluep,
-                           const location_type* yylocationp)
-  {
-    YYUSE (yylocationp);
-    YYUSE (yyvaluep);
-    std::ostream& yyoutput = debug_stream ();
-    std::ostream& yyo = yyoutput;
-    YYUSE (yyo);
-    switch (yytype)
-      {
-  ]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))dnl
-[        default:
-          break;
-      }
-  }
-
-
-  void
-  ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
-                           const semantic_type* yyvaluep,
-                           const location_type* yylocationp)
-  {
-    *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
-               << ' ' << yytname[yytype] << " ("
-               << *yylocationp << ": ";
-    yy_symbol_value_print_ (yytype, yyvaluep, yylocationp);
-    *yycdebug_ << ')';
-  }
-
-  std::ostream&
-  ]b4_parser_class_name[::debug_stream () const
-  {
-    return *yycdebug_;
-  }
-
-  void
-  ]b4_parser_class_name[::set_debug_stream (std::ostream& o)
-  {
-    yycdebug_ = &o;
-  }
-
-
-  ]b4_parser_class_name[::debug_level_type
-  ]b4_parser_class_name[::debug_level () const
-  {
-    return yydebug;
-  }
-
-  void
-  ]b4_parser_class_name[::set_debug_level (debug_level_type l)
-  {
-    // Actually, it is yydebug which is really used.
-    yydebug = l;
-  }
-
-#endif
-]m4_popdef([b4_parse_param])dnl
-b4_namespace_close])
-
-
-# Let glr.c believe that the user arguments include the parser itself.
-m4_ifset([b4_parse_param],
-[m4_pushdef([b4_parse_param],
-            [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
-m4_defn([b4_parse_param]))],
-[m4_pushdef([b4_parse_param],
-            [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]]])
-])
-m4_include(b4_pkgdatadir/[glr.c])
-m4_popdef([b4_parse_param])
-
-m4_divert_push(0)
-@output(b4_spec_defines_file@)@
-b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-             [2002-2006, 2009-2012])[
-
-/* C++ GLR parser skeleton written by Akim Demaille.  */
-
-]b4_cpp_guard_open([b4_spec_defines_file])[
-
-]b4_percent_code_get([[requires]])[
-
-# include <string>
-# include <iostream>
-]b4_percent_define_ifdef([[location_type]], [],
-                         [[# include "location.hh"]])[
-
-]b4_YYDEBUG_define[
-
-]b4_namespace_open[
-  /// A Bison parser.
-  class ]b4_parser_class_name[
-  {
-  public:
-    /// Symbol semantic values.
-# ifndef ]b4_api_PREFIX[STYPE
-]m4_ifdef([b4_stype],
-[    union semantic_type
-    {
-b4_user_stype
-    };],
-[m4_if(b4_tag_seen_flag, 0,
-[[    typedef int semantic_type;]],
-[[    typedef ]b4_api_PREFIX[STYPE semantic_type;]])])[
-# else
-    typedef ]b4_api_PREFIX[STYPE semantic_type;
-# endif
-    /// Symbol locations.
-    typedef ]b4_percent_define_get([[location_type]],
-                                   [[location]])[ location_type;
-    /// Tokens.
-    struct token
-    {
-      ]b4_token_enums(b4_tokens)[
-    };
-    /// Token type.
-    typedef token::yytokentype token_type;
-
-    /// Build a parser object.
-    ]b4_parser_class_name[ (]b4_parse_param_decl[);
-    virtual ~]b4_parser_class_name[ ();
-
-    /// Parse.
-    /// \returns  0 iff parsing succeeded.
-    virtual int parse ();
-
-    /// The current debugging stream.
-    std::ostream& debug_stream () const;
-    /// Set the current debugging stream.
-    void set_debug_stream (std::ostream &);
-
-    /// Type for debugging levels.
-    typedef int debug_level_type;
-    /// The current debugging level.
-    debug_level_type debug_level () const;
-    /// Set the current debugging level.
-    void set_debug_level (debug_level_type l);
-
-  private:
-
-  public:
-    /// Report a syntax error.
-    /// \param loc    where the syntax error is found.
-    /// \param msg    a description of the syntax error.
-    virtual void error (const location_type& loc, const std::string& msg);
-  private:
-
-# if ]b4_api_PREFIX[DEBUG
-  public:
-    /// \brief Report a symbol value on the debug stream.
-    /// \param yytype       The token type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yy_symbol_value_print_ (int yytype,
-                                         const semantic_type* yyvaluep,
-                                         const location_type* yylocationp);
-    /// \brief Report a symbol on the debug stream.
-    /// \param yytype       The token type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yy_symbol_print_ (int yytype,
-                                   const semantic_type* yyvaluep,
-                                   const location_type* yylocationp);
-  private:
-    /* Debugging.  */
-    std::ostream* yycdebug_;
-# endif
-
-]b4_parse_param_vars[
-  };
-
-]dnl Redirections for glr.c.
-b4_percent_define_flag_if([[global_tokens_and_yystype]],
-[b4_token_defines(b4_tokens)])
-[
-#ifndef ]b4_api_PREFIX[STYPE
-# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
-#endif
-#ifndef ]b4_api_PREFIX[LTYPE
-# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
-#endif
-
-]b4_namespace_close[
-]b4_percent_code_get([[provides]])[
-]b4_cpp_guard_close([b4_spec_defines_file])[
-]m4_divert_pop(0)

data/java.m4

@@ -1,304 +0,0 @@
-                                                            -*- Autoconf -*-
-
-# Java language support for Bison
-
-# Copyright (C) 2007-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-m4_include(b4_pkgdatadir/[c-like.m4])
-
-# b4_comment(TEXT)
-# ----------------
-m4_define([b4_comment], [/* m4_bpatsubst([$1], [
-], [
-   ])  */])
-
-
-# b4_list2(LIST1, LIST2)
-# --------------------------
-# Join two lists with a comma if necessary.
-m4_define([b4_list2],
-	  [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
-
-
-# b4_percent_define_get3(DEF, PRE, POST, NOT)
-# -------------------------------------------
-# Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
-# otherwise NOT.
-m4_define([b4_percent_define_get3],
-	  [m4_ifval(m4_quote(b4_percent_define_get([$1])),
-		[$2[]b4_percent_define_get([$1])[]$3], [$4])])
-
-
-
-# b4_flag_value(BOOLEAN-FLAG)
-# ---------------------------
-m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
-
-
-# b4_public_if(TRUE, FALSE)
-# -------------------------
-b4_percent_define_default([[public]], [[false]])
-m4_define([b4_public_if],
-[b4_percent_define_flag_if([public], [$1], [$2])])
-
-
-# b4_abstract_if(TRUE, FALSE)
-# ---------------------------
-b4_percent_define_default([[abstract]], [[false]])
-m4_define([b4_abstract_if],
-[b4_percent_define_flag_if([abstract], [$1], [$2])])
-
-
-# b4_final_if(TRUE, FALSE)
-# ---------------------------
-b4_percent_define_default([[final]], [[false]])
-m4_define([b4_final_if],
-[b4_percent_define_flag_if([final], [$1], [$2])])
-
-
-# b4_strictfp_if(TRUE, FALSE)
-# ---------------------------
-b4_percent_define_default([[strictfp]], [[false]])
-m4_define([b4_strictfp_if],
-[b4_percent_define_flag_if([strictfp], [$1], [$2])])
-
-
-# b4_lexer_if(TRUE, FALSE)
-# ------------------------
-m4_define([b4_lexer_if],
-[b4_percent_code_ifdef([[lexer]], [$1], [$2])])
-
-
-# b4_identification
-# -----------------
-m4_define([b4_identification],
-[  /** Version number for the Bison executable that generated this parser.  */
-  public static final String bisonVersion = "b4_version";
-
-  /** Name of the skeleton that generated this parser.  */
-  public static final String bisonSkeleton = b4_skeleton;
-])
-
-
-## ------------ ##
-## Data types.  ##
-## ------------ ##
-
-# b4_int_type(MIN, MAX)
-# ---------------------
-# Return the smallest int type able to handle numbers ranging from
-# MIN to MAX (included).
-m4_define([b4_int_type],
-[m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
-       b4_ints_in($@, [-32768], [32767]), [1], [short],
-					       [int])])
-
-# b4_int_type_for(NAME)
-# ---------------------
-# Return the smallest int type able to handle numbers ranging from
-# `NAME_min' to `NAME_max' (included).
-m4_define([b4_int_type_for],
-[b4_int_type($1_min, $1_max)])
-
-# b4_null
-# -------
-m4_define([b4_null], [null])
-
-
-## ------------------------- ##
-## Assigning token numbers.  ##
-## ------------------------- ##
-
-# b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
-# ---------------------------------------
-# Output the definition of this token as an enum.
-m4_define([b4_token_enum],
-[  /** Token number, to be returned by the scanner.  */
-  public static final int $1 = $2;
-])
-
-
-# b4_token_enums(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
-# -----------------------------------------------------
-# Output the definition of the tokens (if there are) as enums.
-m4_define([b4_token_enums],
-[m4_if([$#$1], [1], [],
-[/* Tokens.  */
-m4_map([b4_token_enum], [$@])])
-])
-
-# b4-case(ID, CODE)
-# -----------------
-# We need to fool Java's stupid unreachable code detection.
-m4_define([b4_case], [  case $1:
-  if (yyn == $1)
-    $2;
-  break;
-    ])
-
-
-## ---------------- ##
-## Default values.  ##
-## ---------------- ##
-
-m4_define([b4_yystype], [b4_percent_define_get([[stype]])])
-b4_percent_define_default([[stype]], [[Object]])])
-
-# %name-prefix
-m4_define_default([b4_prefix], [[YY]])
-
-b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])])
-m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])])
-
-b4_percent_define_default([[lex_throws]], [[java.io.IOException]])])
-m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])
-
-b4_percent_define_default([[throws]], [])])
-m4_define([b4_throws], [b4_percent_define_get([[throws]])])
-
-b4_percent_define_default([[location_type]], [Location])])
-m4_define([b4_location_type], [b4_percent_define_get([[location_type]])])
-
-b4_percent_define_default([[position_type]], [Position])])
-m4_define([b4_position_type], [b4_percent_define_get([[position_type]])])
-
-
-## ----------------- ##
-## Semantic Values.  ##
-## ----------------- ##
-
-
-# b4_lhs_value([TYPE])
-# --------------------
-# Expansion of $<TYPE>$.
-m4_define([b4_lhs_value], [yyval])
-
-
-# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
-# --------------------------------------
-# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
-# symbols on RHS.
-#
-# In this simple implementation, %token and %type have class names
-# between the angle brackets.
-m4_define([b4_rhs_value],
-[(m4_ifval($3, [($3)])[](yystack.valueAt ($1-($2))))])
-
-# b4_lhs_location()
-# -----------------
-# Expansion of @$.
-m4_define([b4_lhs_location],
-[(yyloc)])
-
-
-# b4_rhs_location(RULE-LENGTH, NUM)
-# ---------------------------------
-# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
-# on RHS.
-m4_define([b4_rhs_location],
-[yystack.locationAt ($1-($2))])
-
-
-# b4_lex_param
-# b4_parse_param
-# --------------
-# If defined, b4_lex_param arrives double quoted, but below we prefer
-# it to be single quoted.  Same for b4_parse_param.
-
-# TODO: should be in bison.m4
-m4_define_default([b4_lex_param], [[]]))
-m4_define([b4_lex_param], b4_lex_param))
-m4_define([b4_parse_param], b4_parse_param))
-
-# b4_lex_param_decl
-# -------------------
-# Extra formal arguments of the constructor.
-m4_define([b4_lex_param_decl],
-[m4_ifset([b4_lex_param],
-          [b4_remove_comma([$1],
-			   b4_param_decls(b4_lex_param))],
-	  [$1])])
-
-m4_define([b4_param_decls],
-	  [m4_map([b4_param_decl], [$@])])
-m4_define([b4_param_decl], [, $1])
-
-m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
-
-
-
-# b4_parse_param_decl
-# -------------------
-# Extra formal arguments of the constructor.
-m4_define([b4_parse_param_decl],
-[m4_ifset([b4_parse_param],
-          [b4_remove_comma([$1],
-			   b4_param_decls(b4_parse_param))],
-	  [$1])])
-
-
-
-# b4_lex_param_call
-# -------------------
-# Delegating the lexer parameters to the lexer constructor.
-m4_define([b4_lex_param_call],
-          [m4_ifset([b4_lex_param],
-	            [b4_remove_comma([$1],
-				     b4_param_calls(b4_lex_param))],
-	            [$1])])
-m4_define([b4_param_calls],
-	  [m4_map([b4_param_call], [$@])])
-m4_define([b4_param_call], [, $2])
-
-
-
-# b4_parse_param_cons
-# -------------------
-# Extra initialisations of the constructor.
-m4_define([b4_parse_param_cons],
-          [m4_ifset([b4_parse_param],
-		    [b4_constructor_calls(b4_parse_param)])])
-
-m4_define([b4_constructor_calls],
-	  [m4_map([b4_constructor_call], [$@])])
-m4_define([b4_constructor_call],
-	  [this.$2 = $2;
-	  ])
-
-
-
-# b4_parse_param_vars
-# -------------------
-# Extra instance variables.
-m4_define([b4_parse_param_vars],
-          [m4_ifset([b4_parse_param],
-		    [
-    /* User arguments.  */
-b4_var_decls(b4_parse_param)])])
-
-m4_define([b4_var_decls],
-	  [m4_map_sep([b4_var_decl], [
-], [$@])])
-m4_define([b4_var_decl],
-	  [    protected final $1;])
-
-
-
-# b4_maybe_throws(THROWS)
-# -----------------------
-# Expand to either an empty string or "throws THROWS".
-m4_define([b4_maybe_throws],
-	  [m4_ifval($1, [throws $1])])

data/lalr1.java

@@ -1,928 +0,0 @@
-# Java skeleton for Bison -*- autoconf -*-
-
-# Copyright (C) 2007-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-m4_include(b4_pkgdatadir/[java.m4])
-
-b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java], [b4_skeleton])])
-m4_ifval(m4_defn([b4_symbol_destructors]),
-        [b4_fatal([%s: %%destructor does not make sense in Java], [b4_skeleton])],
-        [])
-
-m4_divert_push(0)dnl
-@output(b4_parser_file_name@)@
-b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
-             [2007-2012])
-
-b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);
-])[/* First part of user declarations.  */
-]b4_pre_prologue
-b4_percent_code_get([[imports]])
-[/**
- * A Bison parser, automatically generated from <tt>]m4_bpatsubst(b4_file_name, [^"\(.*\)"$], [\1])[</tt>.
- *
- * @@author LALR (1) parser skeleton written by Paolo Bonzini.
- */
-]b4_public_if([public ])dnl
-b4_abstract_if([abstract ])dnl
-b4_final_if([final ])dnl
-b4_strictfp_if([strictfp ])dnl
-[class ]b4_parser_class_name[]dnl
-b4_percent_define_get3([extends], [ extends ])dnl
-b4_percent_define_get3([implements], [ implements ])[
-{
-  ]b4_identification[
-
-  /** True if verbose error messages are enabled.  */
-  public boolean errorVerbose = ]b4_flag_value([error_verbose]);
-
-b4_locations_if([[
-  /**
-   * A class defining a pair of positions.  Positions, defined by the
-   * <code>]b4_position_type[</code> class, denote a point in the input.
-   * Locations represent a part of the input through the beginning
-   * and ending positions.  */
-  public class ]b4_location_type[ {
-    /** The first, inclusive, position in the range.  */
-    public ]b4_position_type[ begin;
-
-    /** The first position beyond the range.  */
-    public ]b4_position_type[ end;
-
-    /**
-     * Create a <code>]b4_location_type[</code> denoting an empty range located at
-     * a given point.
-     * @@param loc The position at which the range is anchored.  */
-    public ]b4_location_type[ (]b4_position_type[ loc) {
-      this.begin = this.end = loc;
-    }
-
-    /**
-     * Create a <code>]b4_location_type[</code> from the endpoints of the range.
-     * @@param begin The first position included in the range.
-     * @@param end   The first position beyond the range.  */
-    public ]b4_location_type[ (]b4_position_type[ begin, ]b4_position_type[ end) {
-      this.begin = begin;
-      this.end = end;
-    }
-
-    /**
-     * Print a representation of the location.  For this to be correct,
-     * <code>]b4_position_type[</code> should override the <code>equals</code>
-     * method.  */
-    public String toString () {
-      if (begin.equals (end))
-        return begin.toString ();
-      else
-        return begin.toString () + "-" + end.toString ();
-    }
-  }
-
-]])
-
-[  /** Token returned by the scanner to signal the end of its input.  */
-  public static final int EOF = 0;]
-
-b4_token_enums(b4_tokens)
-
-  b4_locations_if([[
-  private ]b4_location_type[ yylloc (YYStack rhs, int n)
-  {
-    if (n > 0)
-      return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
-    else
-      return new ]b4_location_type[ (rhs.locationAt (0).end);
-  }]])[
-
-  /**
-   * Communication interface between the scanner and the Bison-generated
-   * parser <tt>]b4_parser_class_name[</tt>.
-   */
-  public interface Lexer {
-    ]b4_locations_if([[/**
-     * Method to retrieve the beginning position of the last scanned token.
-     * @@return the position at which the last scanned token starts.  */
-    ]b4_position_type[ getStartPos ();
-
-    /**
-     * Method to retrieve the ending position of the last scanned token.
-     * @@return the first position beyond the last scanned token.  */
-    ]b4_position_type[ getEndPos ();]])[
-
-    /**
-     * Method to retrieve the semantic value of the last scanned token.
-     * @@return the semantic value of the last scanned token.  */
-    ]b4_yystype[ getLVal ();
-
-    /**
-     * Entry point for the scanner.  Returns the token identifier corresponding
-     * to the next token and prepares to return the semantic value
-     * ]b4_locations_if([and beginning/ending positions ])[of the token.
-     * @@return the token identifier corresponding to the next token. */
-    int yylex () ]b4_maybe_throws([b4_lex_throws])[;
-
-    /**
-     * Entry point for error reporting.  Emits an error
-     * ]b4_locations_if([referring to the given location ])[in a user-defined way.
-     *
-     * ]b4_locations_if([[@@param loc The location of the element to which the
-     *                error message is related]])[
-     * @@param s The string for the error message.  */
-     void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String s);]
-  }
-
-  b4_lexer_if([[private class YYLexer implements Lexer {
-]b4_percent_code_get([[lexer]])[
-  }
-
-  ]])[/** The object doing lexical analysis for us.  */
-  private Lexer yylexer;
-  ]
-  b4_parse_param_vars
-
-b4_lexer_if([[
-  /**
-   * Instantiates the Bison-generated parser.
-   */
-  public ]b4_parser_class_name (b4_parse_param_decl([b4_lex_param_decl])[) {
-    this.yylexer = new YYLexer(]b4_lex_param_call[);
-    ]b4_parse_param_cons[
-  }
-]])
-
-  /**
-   * Instantiates the Bison-generated parser.
-   * @@param yylexer The scanner that will supply tokens to the parser.
-   */
-  b4_lexer_if([[protected]], [[public]]) b4_parser_class_name[ (]b4_parse_param_decl([[Lexer yylexer]])[) {
-    this.yylexer = yylexer;
-    ]b4_parse_param_cons[
-  }
-
-  private java.io.PrintStream yyDebugStream = System.err;
-
-  /**
-   * Return the <tt>PrintStream</tt> on which the debugging output is
-   * printed.
-   */
-  public final java.io.PrintStream getDebugStream () { return yyDebugStream; }
-
-  /**
-   * Set the <tt>PrintStream</tt> on which the debug output is printed.
-   * @@param s The stream that is used for debugging output.
-   */
-  public final void setDebugStream(java.io.PrintStream s) { yyDebugStream = s; }
-
-  private int yydebug = 0;
-
-  /**
-   * Answer the verbosity of the debugging output; 0 means that all kinds of
-   * output from the parser are suppressed.
-   */
-  public final int getDebugLevel() { return yydebug; }
-
-  /**
-   * Set the verbosity of the debugging output; 0 means that all kinds of
-   * output from the parser are suppressed.
-   * @@param level The verbosity level for debugging output.
-   */
-  public final void setDebugLevel(int level) { yydebug = level; }
-
-  private final int yylex () ]b4_maybe_throws([b4_lex_throws]) [{
-    return yylexer.yylex ();
-  }
-  protected final void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String s) {
-    yylexer.yyerror (]b4_locations_if([loc, ])[s);
-  }
-
-  ]b4_locations_if([
-  protected final void yyerror (String s) {
-    yylexer.yyerror ((]b4_location_type[)null, s);
-  }
-  protected final void yyerror (]b4_position_type[ loc, String s) {
-    yylexer.yyerror (new ]b4_location_type[ (loc), s);
-  }])
-
-  [protected final void yycdebug (String s) {
-    if (yydebug > 0)
-      yyDebugStream.println (s);
-  }
-
-  private final class YYStack {
-    private int[] stateStack = new int[16];
-    ]b4_locations_if([[private ]b4_location_type[[] locStack = new ]b4_location_type[[16];]])[
-    private ]b4_yystype[[] valueStack = new ]b4_yystype[[16];
-
-    public int size = 16;
-    public int height = -1;
-
-    public final void push (int state, ]b4_yystype[ value]dnl
-			    b4_locations_if([, ]b4_location_type[ loc])[) {
-      height++;
-      if (size == height)
-        {
-	  int[] newStateStack = new int[size * 2];
-	  System.arraycopy (stateStack, 0, newStateStack, 0, height);
-	  stateStack = newStateStack;
-	  ]b4_locations_if([[
-	  ]b4_location_type[[] newLocStack = new ]b4_location_type[[size * 2];
-	  System.arraycopy (locStack, 0, newLocStack, 0, height);
-	  locStack = newLocStack;]])
-
-	  b4_yystype[[] newValueStack = new ]b4_yystype[[size * 2];
-	  System.arraycopy (valueStack, 0, newValueStack, 0, height);
-	  valueStack = newValueStack;
-
-	  size *= 2;
-	}
-
-      stateStack[height] = state;
-      ]b4_locations_if([[locStack[height] = loc;]])[
-      valueStack[height] = value;
-    }
-
-    public final void pop () {
-      pop (1);
-    }
-
-    public final void pop (int num) {
-      // Avoid memory leaks... garbage collection is a white lie!
-      if (num > 0) {
-	java.util.Arrays.fill (valueStack, height - num + 1, height + 1, null);
-        ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height + 1, null);]])[
-      }
-      height -= num;
-    }
-
-    public final int stateAt (int i) {
-      return stateStack[height - i];
-    }
-
-    ]b4_locations_if([[public final ]b4_location_type[ locationAt (int i) {
-      return locStack[height - i];
-    }
-
-    ]])[public final ]b4_yystype[ valueAt (int i) {
-      return valueStack[height - i];
-    }
-
-    // Print the state stack on the debug stream.
-    public void print (java.io.PrintStream out)
-    {
-      out.print ("Stack now");
-
-      for (int i = 0; i <= height; i++)
-        {
-	  out.print (' ');
-	  out.print (stateStack[i]);
-        }
-      out.println ();
-    }
-  }
-
-  /**
-   * Returned by a Bison action in order to stop the parsing process and
-   * return success (<tt>true</tt>).  */
-  public static final int YYACCEPT = 0;
-
-  /**
-   * Returned by a Bison action in order to stop the parsing process and
-   * return failure (<tt>false</tt>).  */
-  public static final int YYABORT = 1;
-
-  /**
-   * Returned by a Bison action in order to start error recovery without
-   * printing an error message.  */
-  public static final int YYERROR = 2;
-
-  // Internal return codes that are not supported for user semantic
-  // actions.
-  private static final int YYERRLAB = 3;
-  private static final int YYNEWSTATE = 4;
-  private static final int YYDEFAULT = 5;
-  private static final int YYREDUCE = 6;
-  private static final int YYERRLAB1 = 7;
-  private static final int YYRETURN = 8;
-
-  private int yyerrstatus_ = 0;
-
-  /**
-   * Return whether error recovery is being done.  In this state, the parser
-   * reads token until it reaches a known state, and then restarts normal
-   * operation.  */
-  public final boolean recovering ()
-  {
-    return yyerrstatus_ == 0;
-  }
-
-  private int yyaction (int yyn, YYStack yystack, int yylen) ]b4_maybe_throws([b4_throws])[
-  {
-    ]b4_yystype[ yyval;
-    ]b4_locations_if([b4_location_type[ yyloc = yylloc (yystack, yylen);]])[
-
-    /* If YYLEN is nonzero, implement the default value of the action:
-       `$$ = $1'.  Otherwise, use the top of the stack.
-
-       Otherwise, the following line sets YYVAL to garbage.
-       This behavior is undocumented and Bison
-       users should not rely upon it.  */
-    if (yylen > 0)
-      yyval = yystack.valueAt (yylen - 1);
-    else
-      yyval = yystack.valueAt (0);
-
-    yy_reduce_print (yyn, yystack);
-
-    switch (yyn)
-      {
-	]b4_user_actions[
-	default: break;
-      }
-
-    yy_symbol_print ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[);
-
-    yystack.pop (yylen);
-    yylen = 0;
-
-    /* Shift the result of the reduction.  */
-    yyn = yyr1_[yyn];
-    int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
-    if (0 <= yystate && yystate <= yylast_
-	&& yycheck_[yystate] == yystack.stateAt (0))
-      yystate = yytable_[yystate];
-    else
-      yystate = yydefgoto_[yyn - yyntokens_];
-
-    yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
-    return YYNEWSTATE;
-  }
-
-  /* Return YYSTR after stripping away unnecessary quotes and
-     backslashes, so that it's suitable for yyerror.  The heuristic is
-     that double-quoting is unnecessary unless the string contains an
-     apostrophe, a comma, or backslash (other than backslash-backslash).
-     YYSTR is taken from yytname.  */
-  private final String yytnamerr_ (String yystr)
-  {
-    if (yystr.charAt (0) == '"')
-      {
-        StringBuffer yyr = new StringBuffer ();
-        strip_quotes: for (int i = 1; i < yystr.length (); i++)
-          switch (yystr.charAt (i))
-            {
-            case '\'':
-            case ',':
-              break strip_quotes;
-
-            case '\\':
-	      if (yystr.charAt(++i) != '\\')
-                break strip_quotes;
-              /* Fall through.  */
-            default:
-              yyr.append (yystr.charAt (i));
-              break;
-
-            case '"':
-              return yyr.toString ();
-            }
-      }
-    else if (yystr.equals ("$end"))
-      return "end of input";
-
-    return yystr;
-  }
-
-  /*--------------------------------.
-  | Print this symbol on YYOUTPUT.  |
-  `--------------------------------*/
-
-  private void yy_symbol_print (String s, int yytype,
-			         ]b4_yystype[ yyvaluep]dnl
-				 b4_locations_if([, Object yylocationp])[)
-  {
-    if (yydebug > 0)
-    yycdebug (s + (yytype < yyntokens_ ? " token " : " nterm ")
-	      + yytname_[yytype] + " ("]b4_locations_if([
-	      + yylocationp + ": "])[
-	      + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
-  }
-
-  /**
-   * Parse input from the scanner that was specified at object construction
-   * time.  Return whether the end of the input was reached successfully.
-   *
-   * @@return <tt>true</tt> if the parsing succeeds.  Note that this does not
-   *          imply that there were no syntax errors.
-   */
-  public boolean parse () ]b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])[
-  {
-    /// Lookahead and lookahead in internal form.
-    int yychar = yyempty_;
-    int yytoken = 0;
-
-    /* State.  */
-    int yyn = 0;
-    int yylen = 0;
-    int yystate = 0;
-
-    YYStack yystack = new YYStack ();
-
-    /* Error handling.  */
-    int yynerrs_ = 0;
-    ]b4_locations_if([/// The location where the error started.
-    ]b4_location_type[ yyerrloc = null;
-
-    /// ]b4_location_type[ of the lookahead.
-    ]b4_location_type[ yylloc = new ]b4_location_type[ (null, null);
-
-    /// @@$.
-    ]b4_location_type[ yyloc;])
-
-    /// Semantic value of the lookahead.
-    b4_yystype[ yylval = null;
-
-    yycdebug ("Starting parse\n");
-    yyerrstatus_ = 0;
-
-]m4_ifdef([b4_initial_action], [
-b4_dollar_pushdef([yylval], [], [yylloc])dnl
-/* User initialization code.  */
-b4_user_initial_action
-b4_dollar_popdef])[]dnl
-
-  [  /* Initialize the stack.  */
-    yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
-
-    int label = YYNEWSTATE;
-    for (;;)
-      switch (label)
-      {
-        /* New state.  Unlike in the C/C++ skeletons, the state is already
-	   pushed when we come here.  */
-      case YYNEWSTATE:
-        yycdebug ("Entering state " + yystate + "\n");
-        if (yydebug > 0)
-          yystack.print (yyDebugStream);
-
-        /* Accept?  */
-        if (yystate == yyfinal_)
-          return true;
-
-        /* Take a decision.  First try without lookahead.  */
-        yyn = yypact_[yystate];
-        if (yy_pact_value_is_default_ (yyn))
-          {
-            label = YYDEFAULT;
-	    break;
-          }
-
-        /* Read a lookahead token.  */
-        if (yychar == yyempty_)
-          {
-	    yycdebug ("Reading a token: ");
-	    yychar = yylex ();]
-            b4_locations_if([[
-	    yylloc = new ]b4_location_type[(yylexer.getStartPos (),
-				            yylexer.getEndPos ());]])
-            yylval = yylexer.getLVal ();[
-          }
-
-        /* Convert token to internal form.  */
-        if (yychar <= EOF)
-          {
-	    yychar = yytoken = EOF;
-	    yycdebug ("Now at end of input.\n");
-          }
-        else
-          {
-	    yytoken = yytranslate_ (yychar);
-	    yy_symbol_print ("Next token is", yytoken,
-			     yylval]b4_locations_if([, yylloc])[);
-          }
-
-        /* If the proper action on seeing token YYTOKEN is to reduce or to
-           detect an error, take that action.  */
-        yyn += yytoken;
-        if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
-          label = YYDEFAULT;
-
-        /* <= 0 means reduce or error.  */
-        else if ((yyn = yytable_[yyn]) <= 0)
-          {
-	    if (yy_table_value_is_error_ (yyn))
-	      label = YYERRLAB;
-	    else
-	      {
-	        yyn = -yyn;
-	        label = YYREDUCE;
-	      }
-          }
-
-        else
-          {
-            /* Shift the lookahead token.  */
-	    yy_symbol_print ("Shifting", yytoken,
-			     yylval]b4_locations_if([, yylloc])[);
-
-            /* Discard the token being shifted.  */
-            yychar = yyempty_;
-
-            /* Count tokens shifted since error; after three, turn off error
-               status.  */
-            if (yyerrstatus_ > 0)
-              --yyerrstatus_;
-
-            yystate = yyn;
-            yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
-            label = YYNEWSTATE;
-          }
-        break;
-
-      /*-----------------------------------------------------------.
-      | yydefault -- do the default action for the current state.  |
-      `-----------------------------------------------------------*/
-      case YYDEFAULT:
-        yyn = yydefact_[yystate];
-        if (yyn == 0)
-          label = YYERRLAB;
-        else
-          label = YYREDUCE;
-        break;
-
-      /*-----------------------------.
-      | yyreduce -- Do a reduction.  |
-      `-----------------------------*/
-      case YYREDUCE:
-        yylen = yyr2_[yyn];
-        label = yyaction (yyn, yystack, yylen);
-	yystate = yystack.stateAt (0);
-        break;
-
-      /*------------------------------------.
-      | yyerrlab -- here on detecting error |
-      `------------------------------------*/
-      case YYERRLAB:
-        /* If not already recovering from an error, report this error.  */
-        if (yyerrstatus_ == 0)
-          {
-            ++yynerrs_;
-            if (yychar == yyempty_)
-              yytoken = yyempty_;
-            yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
-          }
-
-        ]b4_locations_if([yyerrloc = yylloc;])[
-        if (yyerrstatus_ == 3)
-          {
-	    /* If just tried and failed to reuse lookahead token after an
-	     error, discard it.  */
-
-	    if (yychar <= EOF)
-	      {
-	      /* Return failure if at end of input.  */
-	      if (yychar == EOF)
-	        return false;
-	      }
-	    else
-	      yychar = yyempty_;
-          }
-
-        /* Else will try to reuse lookahead token after shifting the error
-           token.  */
-        label = YYERRLAB1;
-        break;
-
-      /*---------------------------------------------------.
-      | errorlab -- error raised explicitly by YYERROR.  |
-      `---------------------------------------------------*/
-      case YYERROR:
-
-        ]b4_locations_if([yyerrloc = yystack.locationAt (yylen - 1);])[
-        /* Do not reclaim the symbols of the rule which action triggered
-           this YYERROR.  */
-        yystack.pop (yylen);
-        yylen = 0;
-        yystate = yystack.stateAt (0);
-        label = YYERRLAB1;
-        break;
-
-      /*-------------------------------------------------------------.
-      | yyerrlab1 -- common code for both syntax error and YYERROR.  |
-      `-------------------------------------------------------------*/
-      case YYERRLAB1:
-        yyerrstatus_ = 3;	/* Each real token shifted decrements this.  */
-
-        for (;;)
-          {
-	    yyn = yypact_[yystate];
-	    if (!yy_pact_value_is_default_ (yyn))
-	      {
-	        yyn += yyterror_;
-	        if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
-	          {
-	            yyn = yytable_[yyn];
-	            if (0 < yyn)
-		      break;
-	          }
-	      }
-
-	    /* Pop the current state because it cannot handle the error token.  */
-	    if (yystack.height == 0)
-	      return false;
-
-	    ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
-	    yystack.pop ();
-	    yystate = yystack.stateAt (0);
-	    if (yydebug > 0)
-	      yystack.print (yyDebugStream);
-          }
-
-	]b4_locations_if([
-	/* Muck with the stack to setup for yylloc.  */
-	yystack.push (0, null, yylloc);
-	yystack.push (0, null, yyerrloc);
-        yyloc = yylloc (yystack, 2);
-	yystack.pop (2);])[
-
-        /* Shift the error token.  */
-        yy_symbol_print ("Shifting", yystos_[yyn],
-			 yylval]b4_locations_if([, yyloc])[);
-
-        yystate = yyn;
-	yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
-        label = YYNEWSTATE;
-        break;
-
-        /* Accept.  */
-      case YYACCEPT:
-        return true;
-
-        /* Abort.  */
-      case YYABORT:
-        return false;
-      }
-  }
-
-  // Generate an error message.
-  private String yysyntax_error (int yystate, int tok)
-  {
-    if (errorVerbose)
-      {
-        /* There are many possibilities here to consider:
-           - Assume YYFAIL is not used.  It's too flawed to consider.
-             See
-             <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
-             for details.  YYERROR is fine as it does not invoke this
-             function.
-           - If this state is a consistent state with a default action,
-             then the only way this function was invoked is if the
-             default action is an error action.  In that case, don't
-             check for expected tokens because there are none.
-           - The only way there can be no lookahead present (in tok) is
-             if this state is a consistent state with a default action.
-             Thus, detecting the absence of a lookahead is sufficient to
-             determine that there is no unexpected or expected token to
-             report.  In that case, just report a simple "syntax error".
-           - Don't assume there isn't a lookahead just because this
-             state is a consistent state with a default action.  There
-             might have been a previous inconsistent state, consistent
-             state with a non-default action, or user semantic action
-             that manipulated yychar.  (However, yychar is currently out
-             of scope during semantic actions.)
-           - Of course, the expected token list depends on states to
-             have correct lookahead information, and it depends on the
-             parser not to perform extra reductions after fetching a
-             lookahead from the scanner and before detecting a syntax
-             error.  Thus, state merging (from LALR or IELR) and default
-             reductions corrupt the expected token list.  However, the
-             list is correct for canonical LR with one exception: it
-             will still contain any token that will not be accepted due
-             to an error action in a later state.
-        */
-        if (tok != yyempty_)
-          {
-            // FIXME: This method of building the message is not compatible
-            // with internationalization.
-            StringBuffer res =
-              new StringBuffer ("syntax error, unexpected ");
-            res.append (yytnamerr_ (yytname_[tok]));
-            int yyn = yypact_[yystate];
-            if (!yy_pact_value_is_default_ (yyn))
-              {
-                /* Start YYX at -YYN if negative to avoid negative
-                   indexes in YYCHECK.  In other words, skip the first
-                   -YYN actions for this state because they are default
-                   actions.  */
-                int yyxbegin = yyn < 0 ? -yyn : 0;
-                /* Stay within bounds of both yycheck and yytname.  */
-                int yychecklim = yylast_ - yyn + 1;
-                int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
-                int count = 0;
-                for (int x = yyxbegin; x < yyxend; ++x)
-                  if (yycheck_[x + yyn] == x && x != yyterror_
-                      && !yy_table_value_is_error_ (yytable_[x + yyn]))
-                    ++count;
-                if (count < 5)
-                  {
-                    count = 0;
-                    for (int x = yyxbegin; x < yyxend; ++x)
-                      if (yycheck_[x + yyn] == x && x != yyterror_
-                          && !yy_table_value_is_error_ (yytable_[x + yyn]))
-                        {
-                          res.append (count++ == 0 ? ", expecting " : " or ");
-                          res.append (yytnamerr_ (yytname_[x]));
-                        }
-                  }
-              }
-            return res.toString ();
-          }
-      }
-
-    return "syntax error";
-  }
-
-  /**
-   * Whether the given <code>yypact_</code> value indicates a defaulted state.
-   * @@param yyvalue   the value to check
-   */
-  private static boolean yy_pact_value_is_default_ (int yyvalue)
-  {
-    return yyvalue == yypact_ninf_;
-  }
-
-  /**
-   * Whether the given <code>yytable_</code> value indicates a syntax error.
-   * @@param yyvalue   the value to check
-   */
-  private static boolean yy_table_value_is_error_ (int yyvalue)
-  {
-    return yyvalue == yytable_ninf_;
-  }
-
-  /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
-     STATE-NUM.  */
-  private static final ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
-  private static final ]b4_int_type_for([b4_pact])[ yypact_[] =
-  {
-    ]b4_pact[
-  };
-
-  /* YYDEFACT[S] -- default reduction number in state S.  Performed when
-     YYTABLE doesn't specify something else to do.  Zero means the
-     default is an error.  */
-  private static final ]b4_int_type_for([b4_defact])[ yydefact_[] =
-  {
-    ]b4_defact[
-  };
-
-  /* YYPGOTO[NTERM-NUM].  */
-  private static final ]b4_int_type_for([b4_pgoto])[ yypgoto_[] =
-  {
-    ]b4_pgoto[
-  };
-
-  /* YYDEFGOTO[NTERM-NUM].  */
-  private static final ]b4_int_type_for([b4_defgoto])[
-  yydefgoto_[] =
-  {
-    ]b4_defgoto[
-  };
-
-  /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
-     positive, shift that token.  If negative, reduce the rule which
-     number is the opposite.  If YYTABLE_NINF_, syntax error.  */
-  private static final ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
-  private static final ]b4_int_type_for([b4_table])[
-  yytable_[] =
-  {
-    ]b4_table[
-  };
-
-  /* YYCHECK.  */
-  private static final ]b4_int_type_for([b4_check])[
-  yycheck_[] =
-  {
-    ]b4_check[
-  };
-
-  /* STOS_[STATE-NUM] -- The (internal number of the) accessing
-     symbol of state STATE-NUM.  */
-  private static final ]b4_int_type_for([b4_stos])[
-  yystos_[] =
-  {
-    ]b4_stos[
-  };
-
-  /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
-     to YYLEX-NUM.  */
-  private static final ]b4_int_type_for([b4_toknum])[
-  yytoken_number_[] =
-  {
-    ]b4_toknum[
-  };
-
-  /* YYR1[YYN] -- Symbol number of symbol that rule YYN derives.  */
-  private static final ]b4_int_type_for([b4_r1])[
-  yyr1_[] =
-  {
-    ]b4_r1[
-  };
-
-  /* YYR2[YYN] -- Number of symbols composing right hand side of rule YYN.  */
-  private static final ]b4_int_type_for([b4_r2])[
-  yyr2_[] =
-  {
-    ]b4_r2[
-  };
-
-  /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
-     First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
-  private static final String yytname_[] =
-  {
-    ]b4_tname[
-  };
-
-  /* YYRHS -- A `-1'-separated list of the rules' RHS.  */
-  private static final ]b4_int_type_for([b4_rhs])[ yyrhs_[] =
-  {
-    ]b4_rhs[
-  };
-
-  /* YYPRHS[YYN] -- Index of the first RHS symbol of rule number YYN in
-     YYRHS.  */
-  private static final ]b4_int_type_for([b4_prhs])[ yyprhs_[] =
-  {
-    ]b4_prhs[
-  };
-
-  /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
-  private static final ]b4_int_type_for([b4_rline])[ yyrline_[] =
-  {
-    ]b4_rline[
-  };
-
-  // Report on the debug stream that the rule yyrule is going to be reduced.
-  private void yy_reduce_print (int yyrule, YYStack yystack)
-  {
-    if (yydebug == 0)
-      return;
-
-    int yylno = yyrline_[yyrule];
-    int yynrhs = yyr2_[yyrule];
-    /* Print the symbols being reduced, and their result.  */
-    yycdebug ("Reducing stack by rule " + (yyrule - 1)
-	      + " (line " + yylno + "), ");
-
-    /* The symbols being reduced.  */
-    for (int yyi = 0; yyi < yynrhs; yyi++)
-      yy_symbol_print ("   $" + (yyi + 1) + " =",
-		       yyrhs_[yyprhs_[yyrule] + yyi],
-		       ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
-		       b4_rhs_location(yynrhs, yyi + 1)])[);
-  }
-
-  /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
-  private static final ]b4_int_type_for([b4_translate])[ yytranslate_table_[] =
-  {
-    ]b4_translate[
-  };
-
-  private static final ]b4_int_type_for([b4_translate])[ yytranslate_ (int t)
-  {
-    if (t >= 0 && t <= yyuser_token_number_max_)
-      return yytranslate_table_[t];
-    else
-      return yyundef_token_;
-  }
-
-  private static final int yylast_ = ]b4_last[;
-  private static final int yynnts_ = ]b4_nterms_number[;
-  private static final int yyempty_ = -2;
-  private static final int yyfinal_ = ]b4_final_state_number[;
-  private static final int yyterror_ = 1;
-  private static final int yyerrcode_ = 256;
-  private static final int yyntokens_ = ]b4_tokens_number[;
-
-  private static final int yyuser_token_number_max_ = ]b4_user_token_number_max[;
-  private static final int yyundef_token_ = ]b4_undef_token_number[;
-
-]/* User implementation code.  */
-b4_percent_code_get[]dnl
-
-}
-
-b4_epilogue
-m4_divert_pop(0)dnl

data/local.mk

@@ -0,0 +1,57 @@
+## Copyright (C) 2002, 2005-2015, 2018-2020 Free Software Foundation,
+## Inc.
+
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+dist_pkgdata_DATA =                             \
+  data/README.md                                \
+  data/bison-default.css
+
+skeletonsdir = $(pkgdatadir)/skeletons
+dist_skeletons_DATA =                           \
+  data/skeletons/bison.m4                       \
+  data/skeletons/c++-skel.m4                    \
+  data/skeletons/c++.m4                         \
+  data/skeletons/c-like.m4                      \
+  data/skeletons/c-skel.m4                      \
+  data/skeletons/c.m4                           \
+  data/skeletons/glr.c                          \
+  data/skeletons/glr.cc                         \
+  data/skeletons/java-skel.m4                   \
+  data/skeletons/java.m4                        \
+  data/skeletons/lalr1.cc                       \
+  data/skeletons/lalr1.java                     \
+  data/skeletons/location.cc                    \
+  data/skeletons/stack.hh                       \
+  data/skeletons/variant.hh                     \
+  data/skeletons/yacc.c
+
+# Experimental support for the D language.
+dist_skeletons_DATA +=                          \
+  data/skeletons/README-D.txt                   \
+  data/skeletons/d-skel.m4                      \
+  data/skeletons/d.m4                           \
+  data/skeletons/lalr1.d
+
+m4sugardir = $(pkgdatadir)/m4sugar
+dist_m4sugar_DATA =                             \
+  data/m4sugar/foreach.m4                       \
+  data/m4sugar/m4sugar.m4
+
+xsltdir = $(pkgdatadir)/xslt
+dist_xslt_DATA =                                \
+  data/xslt/bison.xsl                           \
+  data/xslt/xml2dot.xsl                         \
+  data/xslt/xml2text.xsl                        \
+  data/xslt/xml2xhtml.xsl

data/location.cc

@@ -1,296 +0,0 @@
-# C++ skeleton for Bison
-
-# Copyright (C) 2002-2007, 2009-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_dir_prefix[]position.hh@)@
-b4_copyright([Positions for Bison parsers in C++],
-             [2002-2007, 2009-2012])[
-
-/**
- ** \file ]b4_dir_prefix[position.hh
- ** Define the ]b4_namespace_ref[::position class.
- */
-
-]b4_cpp_guard_open([b4_dir_prefix[]position.hh])[
-
-# include <algorithm> // std::max
-# include <iostream>
-# include <string>
-
-]b4_null_define[
-
-]b4_namespace_open[
-  /// Abstract a position.
-  class position
-  {
-  public:
-]m4_ifdef([b4_location_constructors], [[
-    /// Construct a position.
-    explicit position (]b4_percent_define_get([[filename_type]])[* f = YY_NULL,
-                       unsigned int l = ]b4_location_initial_line[u,
-                       unsigned int c = ]b4_location_initial_column[u)
-      : filename (f)
-      , line (l)
-      , column (c)
-    {
-    }
-
-]])[
-    /// Initialization.
-    void initialize (]b4_percent_define_get([[filename_type]])[* fn = YY_NULL,
-                     unsigned int l = ]b4_location_initial_line[u,
-                     unsigned int c = ]b4_location_initial_column[u)
-    {
-      filename = fn;
-      line = l;
-      column = c;
-    }
-
-    /** \name Line and Column related manipulators
-     ** \{ */
-    /// (line related) Advance to the COUNT next lines.
-    void lines (int count = 1)
-    {
-      column = ]b4_location_initial_column[u;
-      line += count;
-    }
-
-    /// (column related) Advance to the COUNT next columns.
-    void columns (int count = 1)
-    {
-      column = std::max (]b4_location_initial_column[u, column + count);
-    }
-    /** \} */
-
-    /// File name to which this position refers.
-    ]b4_percent_define_get([[filename_type]])[* filename;
-    /// Current line number.
-    unsigned int line;
-    /// Current column number.
-    unsigned int column;
-  };
-
-  /// Add and assign a position.
-  inline const position&
-  operator+= (position& res, const int width)
-  {
-    res.columns (width);
-    return res;
-  }
-
-  /// Add two position objects.
-  inline const position
-  operator+ (const position& begin, const int width)
-  {
-    position res = begin;
-    return res += width;
-  }
-
-  /// Add and assign a position.
-  inline const position&
-  operator-= (position& res, const int width)
-  {
-    return res += -width;
-  }
-
-  /// Add two position objects.
-  inline const position
-  operator- (const position& begin, const int width)
-  {
-    return begin + -width;
-  }
-]b4_percent_define_flag_if([[define_location_comparison]], [[
-  /// Compare two position objects.
-  inline bool
-  operator== (const position& pos1, const position& pos2)
-  {
-    return (pos1.line == pos2.line
-            && pos1.column == pos2.column
-            && (pos1.filename == pos2.filename
-                || (pos1.filename && pos2.filename
-                    && *pos1.filename == *pos2.filename)));
-  }
-
-  /// Compare two position objects.
-  inline bool
-  operator!= (const position& pos1, const position& pos2)
-  {
-    return !(pos1 == pos2);
-  }
-]])[
-  /** \brief Intercept output stream redirection.
-   ** \param ostr the destination output stream
-   ** \param pos a reference to the position to redirect
-   */
-  inline std::ostream&
-  operator<< (std::ostream& ostr, const position& pos)
-  {
-    if (pos.filename)
-      ostr << *pos.filename << ':';
-    return ostr << pos.line << '.' << pos.column;
-  }
-
-]b4_namespace_close[
-]b4_cpp_guard_close([b4_dir_prefix[]position.hh])
-@output(b4_dir_prefix[]location.hh@)@
-b4_copyright([Locations for Bison parsers in C++],
-             [2002-2007, 2009-2012])[
-
-/**
- ** \file ]b4_dir_prefix[location.hh
- ** Define the ]b4_namespace_ref[::location class.
- */
-
-]b4_cpp_guard_open([b4_dir_prefix[]location.hh])[
-
-# include "position.hh"
-
-]b4_namespace_open[
-
-  /// Abstract a location.
-  class location
-  {
-  public:
-]m4_ifdef([b4_location_constructors], [
-    /// Construct a location from \a b to \a e.
-    location (const position& b, const position& e)
-      : begin (b)
-      , end (e)
-    {
-    }
-
-    /// Construct a 0-width location in \a p.
-    explicit location (const position& p = position ())
-      : begin (p)
-      , end (p)
-    {
-    }
-
-    /// Construct a 0-width location in \a f, \a l, \a c.
-    explicit location (]b4_percent_define_get([[filename_type]])[* f,
-                       unsigned int l = ]b4_location_initial_line[u,
-                       unsigned int c = ]b4_location_initial_column[u)
-      : begin (f, l, c)
-      , end (f, l, c)
-    {
-    }
-
-])[
-    /// Initialization.
-    void initialize (]b4_percent_define_get([[filename_type]])[* f = YY_NULL,
-                     unsigned int l = ]b4_location_initial_line[u,
-                     unsigned int c = ]b4_location_initial_column[u)
-    {
-      begin.initialize (f, l, c);
-      end = begin;
-    }
-
-    /** \name Line and Column related manipulators
-     ** \{ */
-  public:
-    /// Reset initial location to final location.
-    void step ()
-    {
-      begin = end;
-    }
-
-    /// Extend the current location to the COUNT next columns.
-    void columns (unsigned int count = 1)
-    {
-      end += count;
-    }
-
-    /// Extend the current location to the COUNT next lines.
-    void lines (unsigned int count = 1)
-    {
-      end.lines (count);
-    }
-    /** \} */
-
-
-  public:
-    /// Beginning of the located region.
-    position begin;
-    /// End of the located region.
-    position end;
-  };
-
-  /// Join two location objects to create a location.
-  inline const location operator+ (const location& begin, const location& end)
-  {
-    location res = begin;
-    res.end = end.end;
-    return res;
-  }
-
-  /// Add two location objects.
-  inline const location operator+ (const location& begin, unsigned int width)
-  {
-    location res = begin;
-    res.columns (width);
-    return res;
-  }
-
-  /// Add and assign a location.
-  inline location& operator+= (location& res, unsigned int width)
-  {
-    res.columns (width);
-    return res;
-  }
-]b4_percent_define_flag_if([[define_location_comparison]], [[
-  /// Compare two location objects.
-  inline bool
-  operator== (const location& loc1, const location& loc2)
-  {
-    return loc1.begin == loc2.begin && loc1.end == loc2.end;
-  }
-
-  /// Compare two location objects.
-  inline bool
-  operator!= (const location& loc1, const location& loc2)
-  {
-    return !(loc1 == loc2);
-  }
-]])[
-  /** \brief Intercept output stream redirection.
-   ** \param ostr the destination output stream
-   ** \param loc a reference to the location to redirect
-   **
-   ** Avoid duplicate information.
-   */
-  inline std::ostream& operator<< (std::ostream& ostr, const location& loc)
-  {
-    position last = loc.end - 1;
-    ostr << loc.begin;
-    if (last.filename
-	&& (!loc.begin.filename
-	    || *loc.begin.filename != *last.filename))
-      ostr << '-' << last;
-    else if (loc.begin.line != last.line)
-      ostr << '-' << last.line  << '.' << last.column;
-    else if (loc.begin.column != last.column)
-      ostr << '-' << last.column;
-    return ostr;
-  }
-
-]b4_namespace_close[
-
-]b4_cpp_guard_close([b4_dir_prefix[]location.hh])
-m4_divert_pop(0)
-m4_changecom([#])

data/skeletons/README-D.txt

@@ -0,0 +1,60 @@
+Some usage notes for the D Parser:
+
+- it is a port of the Java parser, so interface is very similar.
+
+- the lexer class needs to implement the interface 'Lexer' (similar to
+  java). It typically (depending on options) looks like this:
+
+public interface Lexer
+{
+  /**
+   * Method to retrieve the beginning position of the last scanned token.
+   * @return the position at which the last scanned token starts.  */
+  @property YYPosition startPos ();
+
+  /**
+   * Method to retrieve the ending position of the last scanned token.
+   * @return the first position beyond the last scanned token.  */
+  @property YYPosition endPos ();
+
+  /**
+   * Method to retrieve the semantic value of the last scanned token.
+   * @return the semantic value of the last scanned token.  */
+  @property YYSemanticType semanticVal ();
+
+  /**
+   * Entry point for the scanner.  Returns the token identifier corresponding
+   * to the next token and prepares to return the semantic value
+   * and beginning/ending positions of the token.
+   * @return the token identifier corresponding to the next token. */
+  TokenKind yylex ();
+
+  /**
+   * Entry point for error reporting.  Emits an error
+   * referring to the given location in a user-defined way.
+   *
+   * @param loc The location of the element to which the
+   *                error message is related
+   * @param s The string for the error message.  */
+   void yyerror (YYLocation loc, string s);
+}
+
+- semantic types are handled by D unions (same as for C/C++ parsers)
+
+- the following (non-standard) %defines are supported:
+
+  %define package "<package_name>"
+  %define api.parser.class "my_class_name>"
+  %define position_type "my_position_type"
+  %define location_type "my_location_type"
+
+- the following declarations basically work like in C/C++:
+
+  %locations
+  %error-verbose
+  %parse-param
+  %initial-action
+  %code
+  %union
+
+- %destructor is not yet supported

data/skeletons/c++-skel.m4

@@ -2,7 +2,8 @@
 
 # C++ skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2012 Free Software Foundation, Inc.
+# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+# Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -17,10 +18,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-b4_glr_if(             [m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.cc]])])
-b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.cc]])])
+b4_glr_if(             [m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.cc]])])
+b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.cc]])])
 
-m4_define_default([b4_used_skeleton], [b4_pkgdatadir/[lalr1.cc]])
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.cc]])
 m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
 
 m4_include(b4_used_skeleton)

data/skeletons/c++.m4

@@ -0,0 +1,693 @@
+                                                            -*- Autoconf -*-
+
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Sanity checks, before defaults installed by c.m4.
+b4_percent_define_ifdef([[api.value.union.name]],
+  [b4_complain_at(b4_percent_define_get_loc([[api.value.union.name]]),
+                  [named %union is invalid in C++])])
+
+b4_percent_define_default([[api.symbol.prefix]], [[S_]])
+
+m4_include(b4_skeletonsdir/[c.m4])
+
+b4_percent_define_check_kind([api.namespace], [code], [deprecated])
+b4_percent_define_check_kind([api.parser.class], [code], [deprecated])
+
+
+## ----- ##
+## C++.  ##
+## ----- ##
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# Put TEXT in comment. Prefix all the output lines with PREFIX.
+m4_define([b4_comment],
+[_b4_comment([$1], [$2// ], [$2// ])])
+
+
+# b4_inline(hh|cc)
+# ----------------
+# Expand to `inline\n  ` if $1 is hh.
+m4_define([b4_inline],
+[m4_case([$1],
+  [cc], [],
+  [hh], [[inline
+  ]],
+  [m4_fatal([$0: invalid argument: $1])])])
+
+
+# b4_cxx_portability
+# ------------------
+m4_define([b4_cxx_portability],
+[#if defined __cplusplus
+# define YY_CPLUSPLUS __cplusplus
+#else
+# define YY_CPLUSPLUS 199711L
+#endif
+
+// Support move semantics when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_MOVE           std::move
+# define YY_MOVE_OR_COPY   move
+# define YY_MOVE_REF(Type) Type&&
+# define YY_RVREF(Type)    Type&&
+# define YY_COPY(Type)     Type
+#else
+# define YY_MOVE
+# define YY_MOVE_OR_COPY   copy
+# define YY_MOVE_REF(Type) Type&
+# define YY_RVREF(Type)    const Type&
+# define YY_COPY(Type)     const Type&
+#endif
+
+// Support noexcept when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_NOEXCEPT noexcept
+# define YY_NOTHROW
+#else
+# define YY_NOEXCEPT
+# define YY_NOTHROW throw ()
+#endif
+
+// Support constexpr when possible.
+#if 201703 <= YY_CPLUSPLUS
+# define YY_CONSTEXPR constexpr
+#else
+# define YY_CONSTEXPR
+#endif[]dnl
+])
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+b4_percent_define_default([[api.parser.class]], [[parser]])
+
+# Don't do that so that we remember whether we're using a user
+# request, or the default value.
+#
+# b4_percent_define_default([[api.location.type]], [[location]])
+
+b4_percent_define_default([[filename_type]], [[std::string]])
+# Make it a warning for those who used betas of Bison 3.0.
+b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))
+
+b4_percent_define_default([[global_tokens_and_yystype]], [[false]])
+b4_percent_define_default([[define_location_comparison]],
+                          [m4_if(b4_percent_define_get([[filename_type]]),
+                                 [std::string], [[true]], [[false]])])
+
+
+
+## ----------- ##
+## Namespace.  ##
+## ----------- ##
+
+m4_define([b4_namespace_ref], [b4_percent_define_get([[api.namespace]])])
+
+
+# Don't permit an empty b4_namespace_ref.  Any '::parser::foo' appended to it
+# would compile as an absolute reference with 'parser' in the global namespace.
+# b4_namespace_open would open an anonymous namespace and thus establish
+# internal linkage.  This would compile.  However, it's cryptic, and internal
+# linkage for the parser would be specified in all translation units that
+# include the header, which is always generated.  If we ever need to permit
+# internal linkage somehow, surely we can find a cleaner approach.
+m4_if(m4_bregexp(b4_namespace_ref, [^[	 ]*$]), [-1], [],
+[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
+                [[namespace reference is empty]])])
+
+# Instead of assuming the C++ compiler will do it, Bison should reject any
+# invalid b4_namespace_ref that would be converted to a valid
+# b4_namespace_open.  The problem is that Bison doesn't always output
+# b4_namespace_ref to uncommented code but should reserve the ability to do so
+# in future releases without risking breaking any existing user grammars.
+# Specifically, don't allow empty names as b4_namespace_open would just convert
+# those into anonymous namespaces, and that might tempt some users.
+m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*::]), [-1], [],
+[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
+                [[namespace reference has consecutive "::"]])])
+m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*$]), [-1], [],
+[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
+                [[namespace reference has a trailing "::"]])])
+
+m4_define([b4_namespace_open],
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
+[namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
+                                                [^\(.\)[	 ]*::], [\1])),
+                         [::], [ { namespace ])[ {]])])
+
+m4_define([b4_namespace_close],
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
+m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
+                                    [^\(.\)[	 ]*\(::\)?\([^][:]\|:[^:]\)*],
+                                    [\1])),
+             [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])
+
+
+## ------------- ##
+## Token kinds.  ##
+## ------------- ##
+
+
+# b4_token_enums
+# --------------
+# Output the definition of the token kinds.
+m4_define([b4_token_enums],
+[[enum token_kind_type
+      {
+        ]b4_symbol([-2], [id])[ = -2,
+]b4_symbol_foreach([b4_token_enum])dnl
+[      };]dnl
+])
+
+
+
+## -------------- ##
+## Symbol kinds.  ##
+## -------------- ##
+
+# b4_declare_symbol_enum
+# ----------------------
+# The definition of the symbol internal numbers as an enum.
+# Defining YYEMPTY here is important: it forces the compiler
+# to use a signed type, which matters for yytoken.
+m4_define([b4_declare_symbol_enum],
+[[enum symbol_kind_type
+      {
+        YYNTOKENS = ]b4_tokens_number[, ///< Number of tokens.
+        ]b4_symbol_kind([-2])[ = -2,
+]b4_symbol_foreach([      b4_symbol_enum])dnl
+[      };]])
+
+
+
+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+
+# b4_value_type_declare
+# ---------------------
+# Declare semantic_type.
+m4_define([b4_value_type_declare],
+[b4_value_type_setup[]dnl
+[    /// Symbol semantic values.
+]m4_bmatch(b4_percent_define_get_kind([[api.value.type]]),
+[code],
+[[    typedef ]b4_percent_define_get([[api.value.type]])[ semantic_type;]],
+[m4_bmatch(b4_percent_define_get([[api.value.type]]),
+[union\|union-directive],
+[[    union semantic_type
+    {
+]b4_user_union_members[
+    };]])])dnl
+])
+
+
+# b4_public_types_declare
+# -----------------------
+# Define the public types: token, semantic value, location, and so forth.
+# Depending on %define token_lex, may be output in the header or source file.
+m4_define([b4_public_types_declare],
+[[#ifndef ]b4_api_PREFIX[STYPE
+]b4_value_type_declare[
+#else
+    typedef ]b4_api_PREFIX[STYPE semantic_type;
+#endif]b4_locations_if([
+    /// Symbol locations.
+    typedef b4_percent_define_get([[api.location.type]],
+                                  [[location]]) location_type;])[
+
+    /// Syntax errors thrown from user actions.
+    struct syntax_error : std::runtime_error
+    {
+      syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
+        : std::runtime_error (m)]b4_locations_if([
+        , location (l)])[
+      {}
+
+      syntax_error (const syntax_error& s)
+        : std::runtime_error (s.what ())]b4_locations_if([
+        , location (s.location)])[
+      {}
+
+      ~syntax_error () YY_NOEXCEPT YY_NOTHROW;]b4_locations_if([
+
+      location_type location;])[
+    };
+
+    /// Token kinds.
+    struct token
+    {
+      ]b4_token_enums[
+      /// Backward compatibility alias (Bison 3.6).
+      typedef token_kind_type yytokentype;
+    };
+
+    /// Token kind, as returned by yylex.
+    typedef token::yytokentype token_kind_type;
+
+    /// Backward compatibility alias (Bison 3.6).
+    typedef token_kind_type token_type;
+
+    /// Symbol kinds.
+    struct symbol_kind
+    {
+      ]b4_declare_symbol_enum[
+    };
+
+    /// (Internal) symbol kind.
+    typedef symbol_kind::symbol_kind_type symbol_kind_type;
+
+    /// The number of tokens.
+    static const symbol_kind_type YYNTOKENS = symbol_kind::YYNTOKENS;
+]])
+
+
+# b4_symbol_type_define
+# ---------------------
+# Define symbol_type, the external type for symbols used for symbol
+# constructors.
+m4_define([b4_symbol_type_define],
+[[    /// A complete symbol.
+    ///
+    /// Expects its Base type to provide access to the symbol kind
+    /// via kind ().
+    ///
+    /// Provide access to semantic value]b4_locations_if([ and location])[.
+    template <typename Base>
+    struct basic_symbol : Base
+    {
+      /// Alias to Base.
+      typedef Base super_type;
+
+      /// Default constructor.
+      basic_symbol ()
+        : value ()]b4_locations_if([
+        , location ()])[
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      basic_symbol (basic_symbol&& that)
+        : Base (std::move (that))
+        , value (]b4_variant_if([], [std::move (that.value)]))b4_locations_if([
+        , location (std::move (that.location))])[
+      {]b4_variant_if([
+        b4_symbol_variant([this->kind ()], [value], [move],
+                          [std::move (that.value)])
+      ])[}
+#endif
+
+      /// Copy constructor.
+      basic_symbol (const basic_symbol& that);]b4_variant_if([[
+
+      /// Constructor for valueless symbols, and symbols from each type.
+]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
+      /// Constructor for valueless symbols.
+      basic_symbol (typename Base::kind_type t]b4_locations_if([,
+                    YY_MOVE_REF (location_type) l])[);
+
+      /// Constructor for symbols with semantic value.
+      basic_symbol (typename Base::kind_type t,
+                    YY_RVREF (semantic_type) v]b4_locations_if([,
+                    YY_RVREF (location_type) l])[);
+]])[
+      /// Destroy the symbol.
+      ~basic_symbol ()
+      {
+        clear ();
+      }
+
+      /// Destroy contents, and record that is empty.
+      void clear ()
+      {]b4_variant_if([[
+        // User destructor.
+        symbol_kind_type yykind = this->kind ();
+        basic_symbol<Base>& yysym = *this;
+        (void) yysym;
+        switch (yykind)
+        {
+]b4_symbol_foreach([b4_symbol_destructor])dnl
+[       default:
+          break;
+        }
+
+        // Value type destructor.
+]b4_symbol_variant([[yykind]], [[value]], [[template destroy]])])[
+        Base::clear ();
+      }
+
+      /// Backward compatibility (Bison 3.6).
+      symbol_kind_type type_get () const YY_NOEXCEPT;
+
+      /// Whether empty.
+      bool empty () const YY_NOEXCEPT;
+
+      /// Destructive move, \a s is emptied into this.
+      void move (basic_symbol& s);
+
+      /// The semantic value.
+      semantic_type value;]b4_locations_if([
+
+      /// The location.
+      location_type location;])[
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Assignment operator.
+      basic_symbol& operator= (const basic_symbol& that);
+#endif
+    };
+
+    /// Type access provider for token (enum) based symbols.
+    struct by_kind
+    {
+      /// Default constructor.
+      by_kind ();
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      by_kind (by_kind&& that);
+#endif
+
+      /// Copy constructor.
+      by_kind (const by_kind& that);
+
+      /// The symbol kind as needed by the constructor.
+      typedef token_kind_type kind_type;
+
+      /// Constructor from (external) token numbers.
+      by_kind (kind_type t);
+
+      /// Record that this symbol is empty.
+      void clear ();
+
+      /// Steal the symbol kind from \a that.
+      void move (by_kind& that);
+
+      /// The (internal) type number (corresponding to \a type).
+      /// \a empty when empty.
+      symbol_kind_type kind () const YY_NOEXCEPT;
+
+      /// Backward compatibility (Bison 3.6).
+      symbol_kind_type type_get () const YY_NOEXCEPT;
+
+      /// The symbol kind.
+      /// \a ]b4_symbol_prefix[YYEMPTY when empty.
+      symbol_kind_type kind_;
+    };
+
+    /// Backward compatibility for a private implementation detail (Bison 3.6).
+    typedef by_kind by_type;
+
+    /// "External" symbols: returned by the scanner.
+    struct symbol_type : basic_symbol<by_kind>
+    {]b4_variant_if([[
+      /// Superclass.
+      typedef basic_symbol<by_kind> super_type;
+
+      /// Empty symbol.
+      symbol_type () {}
+
+      /// Constructor for valueless symbols, and symbols from each type.
+]b4_type_foreach([_b4_token_constructor_define])dnl
+    ])[};
+]])
+
+
+# b4_public_types_define(hh|cc)
+# -----------------------------
+# Provide the implementation needed by the public types.
+m4_define([b4_public_types_define],
+[[  // basic_symbol.
+  template <typename Base>
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (const basic_symbol& that)
+    : Base (that)
+    , value (]b4_variant_if([], [that.value]))b4_locations_if([
+    , location (that.location)])[
+  {]b4_variant_if([
+    b4_symbol_variant([this->kind ()], [value], [copy],
+                      [YY_MOVE (that.value)])
+  ])[}
+
+]b4_variant_if([], [[
+  /// Constructor for valueless symbols.
+  template <typename Base>
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          b4_locations_if([YY_MOVE_REF (location_type) l]))[)
+    : Base (t)
+    , value ()]b4_locations_if([
+    , location (l)])[
+  {}
+
+  template <typename Base>
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          [YY_RVREF (semantic_type) v],
+          b4_locations_if([YY_RVREF (location_type) l]))[)
+    : Base (t)
+    , value (]b4_variant_if([], [YY_MOVE (v)])[)]b4_locations_if([
+    , location (YY_MOVE (l))])[
+  {]b4_variant_if([[
+    (void) v;
+    ]b4_symbol_variant([this->kind ()], [value], [YY_MOVE_OR_COPY], [YY_MOVE (v)])])[}]])[
+
+  template <typename Base>
+  ]b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::basic_symbol<Base>::type_get () const YY_NOEXCEPT
+  {
+    return this->kind ();
+  }
+
+  template <typename Base>
+  bool
+  ]b4_parser_class[::basic_symbol<Base>::empty () const YY_NOEXCEPT
+  {
+    return this->kind () == symbol_kind::]b4_symbol_prefix[YYEMPTY;
+  }
+
+  template <typename Base>
+  void
+  ]b4_parser_class[::basic_symbol<Base>::move (basic_symbol& s)
+  {
+    super_type::move (s);
+    ]b4_variant_if([b4_symbol_variant([this->kind ()], [value], [move],
+                                      [YY_MOVE (s.value)])],
+                   [value = YY_MOVE (s.value);])[]b4_locations_if([
+    location = YY_MOVE (s.location);])[
+  }
+
+  // by_kind.
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind ()
+    : kind_ (symbol_kind::]b4_symbol_prefix[YYEMPTY)
+  {}
+
+#if 201103L <= YY_CPLUSPLUS
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (by_kind&& that)
+    : kind_ (that.kind_)
+  {
+    that.clear ();
+  }
+#endif
+
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (const by_kind& that)
+    : kind_ (that.kind_)
+  {}
+
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (token_kind_type t)
+    : kind_ (yytranslate_ (t))
+  {}
+
+  ]b4_inline([$1])[void
+  ]b4_parser_class[::by_kind::clear ()
+  {
+    kind_ = symbol_kind::]b4_symbol_prefix[YYEMPTY;
+  }
+
+  ]b4_inline([$1])[void
+  ]b4_parser_class[::by_kind::move (by_kind& that)
+  {
+    kind_ = that.kind_;
+    that.clear ();
+  }
+
+  ]b4_inline([$1])[]b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::by_kind::kind () const YY_NOEXCEPT
+  {
+    return kind_;
+  }
+
+  ]b4_inline([$1])[]b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::by_kind::type_get () const YY_NOEXCEPT
+  {
+    return this->kind ();
+  }
+]])
+
+
+# b4_token_constructor_define
+# ----------------------------
+# Define symbol constructors for all the value types.
+# Use at class-level.  Redefined in variant.hh.
+m4_define([b4_token_constructor_define], [])
+
+
+# b4_yytranslate_define(cc|hh)
+# ----------------------------
+# Define yytranslate_.  Sometimes used in the header file ($1=hh),
+# sometimes in the cc file.
+m4_define([b4_yytranslate_define],
+[  b4_inline([$1])b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::yytranslate_ (int t)
+  {
+]b4_api_token_raw_if(
+[[    return static_cast<symbol_kind_type> (t);]],
+[[    // YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to
+    // TOKEN-NUM as returned by yylex.
+    static
+    const ]b4_int_type_for([b4_translate])[
+    translate_table[] =
+    {
+  ]b4_translate[
+    };
+    const int user_token_number_max_ = ]b4_user_token_number_max[;
+
+    if (t <= 0)
+      return symbol_kind::]b4_symbol_prefix[YYEOF;
+    else if (t <= user_token_number_max_)
+      return YY_CAST (symbol_kind_type, translate_table[t]);
+    else
+      return symbol_kind::]b4_symbol_prefix[YYUNDEF;]])[
+  }
+]])
+
+
+# b4_lhs_value([TYPE])
+# --------------------
+m4_define([b4_lhs_value],
+[b4_symbol_value([yyval], [$1])])
+
+
+# b4_rhs_value(RULE-LENGTH, POS, [TYPE])
+# --------------------------------------
+# FIXME: Dead code.
+m4_define([b4_rhs_value],
+[b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[(yyloc)])
+
+
+# b4_rhs_location(RULE-LENGTH, POS)
+# ---------------------------------
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+[(yylocation_stack_@{($1) - ($2)@})])
+
+
+# b4_parse_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+# Change the parameter names from "foo" into "foo_yyarg", so that
+# there is no collision bw the user chosen attribute name, and the
+# argument name in the constructor.
+m4_define([b4_parse_param_decl],
+[m4_ifset([b4_parse_param],
+          [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])])
+
+m4_define([b4_parse_param_decl_1],
+[$1_yyarg])
+
+
+
+# b4_parse_param_cons
+# -------------------
+# Extra initialisations of the constructor.
+m4_define([b4_parse_param_cons],
+          [m4_ifset([b4_parse_param],
+                    [
+      b4_cc_constructor_calls(b4_parse_param)])])
+m4_define([b4_cc_constructor_calls],
+          [m4_map_sep([b4_cc_constructor_call], [,
+      ], [$@])])
+m4_define([b4_cc_constructor_call],
+          [$2 ($2_yyarg)])
+
+# b4_parse_param_vars
+# -------------------
+# Extra instance variables.
+m4_define([b4_parse_param_vars],
+          [m4_ifset([b4_parse_param],
+                    [
+    // User arguments.
+b4_cc_var_decls(b4_parse_param)])])
+m4_define([b4_cc_var_decls],
+          [m4_map_sep([b4_cc_var_decl], [
+], [$@])])
+m4_define([b4_cc_var_decl],
+          [    $1;])
+
+
+## ---------##
+## Values.  ##
+## ---------##
+
+# b4_yylloc_default_define
+# ------------------------
+# Define YYLLOC_DEFAULT.
+m4_define([b4_yylloc_default_define],
+[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+# ifndef YYLLOC_DEFAULT
+#  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
+    do                                                                  \
+      if (N)                                                            \
+        {                                                               \
+          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
+          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
+        }                                                               \
+    while (false)
+# endif
+]])
+
+## -------- ##
+## Checks.  ##
+## -------- ##
+
+b4_token_ctor_if([b4_variant_if([],
+  [b4_fatal_at(b4_percent_define_get_loc(api.token.constructor),
+               [cannot use '%s' without '%s'],
+               [%define api.token.constructor],
+               [%define api.value.type variant]))])])

data/skeletons/c-like.m4

@@ -0,0 +1,66 @@
+                                                            -*- Autoconf -*-
+
+# Common code for C-like languages (C, C++, Java, etc.)
+
+# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# _b4_comment(TEXT, OPEN, CONTINUE, END)
+# --------------------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+#
+# Prefix all the output lines with PREFIX.
+m4_define([_b4_comment],
+[$2[]m4_bpatsubst(m4_expand([[$1]]), [
+\(.\)], [
+$3\1])$4])
+
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# Put TEXT in comment.  Prefix all the output lines with PREFIX.
+m4_define([b4_comment],
+[_b4_comment([$1], [$2/* ], [$2   ], [  */])])
+
+
+
+
+# _b4_dollar_dollar(VALUE, SYMBOL-NUM, FIELD, DEFAULT-FIELD)
+# ----------------------------------------------------------
+# If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
+# otherwise just VALUE.  Be sure to pass "(VALUE)" if VALUE is a
+# pointer.
+m4_define([_b4_dollar_dollar],
+[b4_symbol_value([$1],
+                 [$2],
+                 m4_if([$3], [[]],
+                       [[$4]], [[$3]]))])
+
+# b4_dollar_pushdef(VALUE-POINTER, SYMBOL-NUM, [TYPE_TAG], LOCATION)
+# b4_dollar_popdef
+# ------------------------------------------------------------------
+# Define b4_dollar_dollar for VALUE-POINTER and DEFAULT-FIELD,
+# and b4_at_dollar for LOCATION.
+m4_define([b4_dollar_pushdef],
+[m4_pushdef([b4_dollar_dollar],
+            [_b4_dollar_dollar([$1], [$2], m4_dquote($][1), [$3])])dnl
+m4_pushdef([b4_at_dollar], [$4])dnl
+])
+m4_define([b4_dollar_popdef],
+[m4_popdef([b4_at_dollar])dnl
+m4_popdef([b4_dollar_dollar])dnl
+])

data/skeletons/c-skel.m4

@@ -2,7 +2,8 @@
 
 # C skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2012 Free Software Foundation, Inc.
+# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+# Foundation, Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -17,10 +18,10 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-b4_glr_if(             [m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.c]])])
-b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.c]])])
+b4_glr_if(             [m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.c]])])
+b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.c]])])
 
-m4_define_default([b4_used_skeleton], [b4_pkgdatadir/[yacc.c]])
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[yacc.c]])
 m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
 
 m4_include(b4_used_skeleton)

data/skeletons/d-skel.m4

@@ -0,0 +1,26 @@
+                                                            -*- Autoconf -*-
+
+# D skeleton dispatching for Bison.
+
+# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+b4_glr_if(             [b4_complain([%%glr-parser not supported for D])])
+b4_nondeterministic_if([b4_complain([%%nondeterministic-parser not supported for D])])
+
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.d]])
+m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
+
+m4_include(b4_used_skeleton)

data/skeletons/d.m4

@@ -0,0 +1,366 @@
+                                                            -*- Autoconf -*-
+
+# D language support for Bison
+
+# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+# _b4_comment(TEXT, OPEN, CONTINUE, END)
+# --------------------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+#
+# Prefix all the output lines with PREFIX.
+m4_define([_b4_comment],
+[$2[]m4_bpatsubst(m4_expand([[$1]]), [
+\(.\)], [
+$3\1])$4])
+
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# Put TEXT in comment.  Prefix all the output lines with PREFIX.
+m4_define([b4_comment],
+[_b4_comment([$1], [$2/* ], [$2   ], [  */])])
+
+
+# b4_sync_start(LINE, FILE)
+# -------------------------
+m4_define([b4_sync_start], [[#]line $1 $2])
+
+
+# b4_list2(LIST1, LIST2)
+# ----------------------
+# Join two lists with a comma if necessary.
+m4_define([b4_list2],
+          [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
+
+
+# b4_percent_define_get3(DEF, PRE, POST, NOT)
+# -------------------------------------------
+# Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
+# otherwise NOT.
+m4_define([b4_percent_define_get3],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$2[]b4_percent_define_get([$1])[]$3], [$4])])
+
+
+# b4_flag_value(BOOLEAN-FLAG)
+# ---------------------------
+m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
+
+
+# b4_parser_class_declaration
+# ---------------------------
+# The declaration of the parser class ("class YYParser"), with all its
+# qualifiers/annotations.
+b4_percent_define_default([[api.parser.abstract]], [[false]])
+b4_percent_define_default([[api.parser.final]],    [[false]])
+b4_percent_define_default([[api.parser.public]],   [[false]])
+
+m4_define([b4_parser_class_declaration],
+[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
+b4_percent_define_flag_if([api.parser.public],   [public ])dnl
+b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
+b4_percent_define_flag_if([api.parser.final],    [final ])dnl
+[class ]b4_parser_class[]dnl
+b4_percent_define_get3([api.parser.extends], [ extends ])dnl
+b4_percent_define_get3([api.parser.implements], [ implements ])])
+
+
+# b4_lexer_if(TRUE, FALSE)
+# ------------------------
+m4_define([b4_lexer_if],
+[b4_percent_code_ifdef([[lexer]], [$1], [$2])])
+
+
+# b4_position_type_if(TRUE, FALSE)
+# --------------------------------
+m4_define([b4_position_type_if],
+[b4_percent_define_ifdef([[position_type]], [$1], [$2])])
+
+
+# b4_location_type_if(TRUE, FALSE)
+# --------------------------------
+m4_define([b4_location_type_if],
+[b4_percent_define_ifdef([[location_type]], [$1], [$2])])
+
+
+# b4_identification
+# -----------------
+m4_define([b4_identification],
+[/** Version number for the Bison executable that generated this parser.  */
+  public static immutable string yy_bison_version = "b4_version";
+
+  /** Name of the skeleton that generated this parser.  */
+  public static immutable string yy_bison_skeleton = b4_skeleton;
+])
+
+
+## ------------ ##
+## Data types.  ##
+## ------------ ##
+
+# b4_int_type(MIN, MAX)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# MIN to MAX (included).
+m4_define([b4_int_type],
+[m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
+       b4_ints_in($@, [-32768], [32767]), [1], [short],
+                                               [int])])
+
+# b4_int_type_for(NAME)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# `NAME_min' to `NAME_max' (included).
+m4_define([b4_int_type_for],
+[b4_int_type($1_min, $1_max)])
+
+# b4_null
+# -------
+m4_define([b4_null], [null])
+
+
+# b4_integral_parser_table_define(NAME, DATA, COMMENT)
+#-----------------------------------------------------
+# Define "yy<TABLE-NAME>" whose contents is CONTENT.
+m4_define([b4_integral_parser_table_define],
+[m4_ifvaln([$3], [b4_comment([$3], [  ])])dnl
+private static immutable b4_int_type_for([$2])[[]] yy$1_ =
+@{
+  $2
+@};dnl
+])
+
+
+## ------------- ##
+## Token kinds.  ##
+## ------------- ##
+
+# b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
+# ---------------------------------------
+# Output the definition of this token as an enum.
+m4_define([b4_token_enum],
+[b4_token_format([  %s = %s,
+], [$1])])
+
+# b4_token_enums
+# --------------
+# Output the definition of the tokens as enums.
+m4_define([b4_token_enums],
+[/* Token kinds.  */
+public enum TokenKind {
+  ]b4_symbol_kind([-2])[ = -2,
+b4_symbol_foreach([b4_token_enum])dnl
+}
+])
+
+
+
+## -------------- ##
+## Symbol kinds.  ##
+## -------------- ##
+
+b4_percent_define_default([[api.symbol.prefix]], [[S_]])
+
+
+# b4_symbol_enum(SYMBOL-NUM)
+# --------------------------
+# Output the definition of this symbol as an enum.
+m4_define([b4_symbol_enum],
+[m4_format([    %-30s %s],
+           m4_format([[%s = %s,]],
+                     b4_symbol([$1], [kind]),
+                     [$1]),
+           [b4_symbol_tag_comment([$1])])])
+
+
+# b4_declare_symbol_enum
+# ----------------------
+# The definition of the symbol internal numbers as an enum.
+# Defining YYEMPTY here is important: it forces the compiler
+# to use a signed type, which matters for yytoken.
+m4_define([b4_declare_symbol_enum],
+[[  /* Symbol kinds.  */
+  public enum SymbolKind
+  {
+    ]b4_symbol_kind([-2])[ = -2,  /* No symbol.  */
+]b4_symbol_foreach([b4_symbol_enum])dnl
+[  };
+]])])
+
+
+
+# b4-case(ID, CODE)
+# -----------------
+m4_define([b4_case], [    case $1:
+$2
+      break;])
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+m4_define([b4_yystype], [b4_percent_define_get([[stype]])])
+b4_percent_define_default([[stype]], [[YYSemanticType]])])
+
+# %name-prefix
+m4_define_default([b4_prefix], [[YY]])
+
+b4_percent_define_default([[api.parser.class]], [b4_prefix[]Parser])])
+m4_define([b4_parser_class], [b4_percent_define_get([[api.parser.class]])])
+
+#b4_percent_define_default([[location_type]], [Location])])
+m4_define([b4_location_type], b4_percent_define_ifdef([[location_type]],[b4_percent_define_get([[location_type]])],[YYLocation]))
+
+#b4_percent_define_default([[position_type]], [Position])])
+m4_define([b4_position_type], b4_percent_define_ifdef([[position_type]],[b4_percent_define_get([[position_type]])],[YYPosition]))
+
+
+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
+# ----------------------------------------------
+# See README.  FIXME: factor in c-like?
+m4_define([b4_symbol_value],
+[m4_ifval([$3],
+          [($1.$3)],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [($1.b4_symbol([$2], [type]))],
+                                  [$1])],
+                    [$1])])])
+
+# b4_lhs_value(SYMBOL-NUM, [TYPE])
+# --------------------------------
+# See README.
+m4_define([b4_lhs_value],
+[b4_symbol_value([yyval], [$1], [$2])])
+
+
+# b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])
+# --------------------------------------------------
+# See README.
+#
+# In this simple implementation, %token and %type have class names
+# between the angle brackets.
+m4_define([b4_rhs_value],
+[b4_symbol_value([(yystack.valueAt (b4_subtract([$1], [$2])))], [$3], [$4])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[(yyloc)])
+
+
+# b4_rhs_location(RULE-LENGTH, POS)
+# ---------------------------------
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+[yystack.locationAt ([$1], [$2])])
+
+
+# b4_lex_param
+# b4_parse_param
+# --------------
+# If defined, b4_lex_param arrives double quoted, but below we prefer
+# it to be single quoted.  Same for b4_parse_param.
+
+# TODO: should be in bison.m4
+m4_define_default([b4_lex_param], [[]]))
+m4_define([b4_lex_param], b4_lex_param))
+m4_define([b4_parse_param], b4_parse_param))
+
+# b4_lex_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+m4_define([b4_lex_param_decl],
+[m4_ifset([b4_lex_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_lex_param))],
+          [$1])])
+
+m4_define([b4_param_decls],
+          [m4_map([b4_param_decl], [$@])])
+m4_define([b4_param_decl], [, $1])
+
+m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
+
+
+
+# b4_parse_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+m4_define([b4_parse_param_decl],
+[m4_ifset([b4_parse_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_parse_param))],
+          [$1])])
+
+
+
+# b4_lex_param_call
+# -------------------
+# Delegating the lexer parameters to the lexer constructor.
+m4_define([b4_lex_param_call],
+          [m4_ifset([b4_lex_param],
+                    [b4_remove_comma([$1],
+                                     b4_param_calls(b4_lex_param))],
+                    [$1])])
+m4_define([b4_param_calls],
+          [m4_map([b4_param_call], [$@])])
+m4_define([b4_param_call], [, $2])
+
+
+
+# b4_parse_param_cons
+# -------------------
+# Extra initialisations of the constructor.
+m4_define([b4_parse_param_cons],
+          [m4_ifset([b4_parse_param],
+                    [b4_constructor_calls(b4_parse_param)])])
+
+m4_define([b4_constructor_calls],
+          [m4_map([b4_constructor_call], [$@])])
+m4_define([b4_constructor_call],
+          [this.$2 = $2;
+          ])
+
+
+
+# b4_parse_param_vars
+# -------------------
+# Extra instance variables.
+m4_define([b4_parse_param_vars],
+          [m4_ifset([b4_parse_param],
+                    [
+    /* User arguments.  */
+b4_var_decls(b4_parse_param)])])
+
+m4_define([b4_var_decls],
+          [m4_map_sep([b4_var_decl], [
+], [$@])])
+m4_define([b4_var_decl],
+          [    protected $1;])

data/skeletons/glr.cc

@@ -0,0 +1,384 @@
+# C++ GLR skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+# This skeleton produces a C++ class that encapsulates a C glr parser.
+# This is in order to reduce the maintenance burden.  The glr.c
+# skeleton is clean and pure enough so that there are no real
+# problems.  The C++ interface is the same as that of lalr1.cc.  In
+# fact, glr.c can replace yacc.c without the user noticing any
+# difference, and similarly for glr.cc replacing lalr1.cc.
+#
+# The passing of parse-params
+#
+#   The additional arguments are stored as members of the parser
+#   object, yyparser.  The C routines need to carry yyparser
+#   throughout the C parser; that's easy: make yyparser an
+#   additional parse-param.  But because the C++ skeleton needs to
+#   know the "real" original parse-param, we save them
+#   (b4_parse_param_orig).  Note that b4_parse_param is overquoted
+#   (and c.m4 strips one level of quotes).  This is a PITA, and
+#   explains why there are so many levels of quotes.
+#
+# The locations
+#
+#   We use location.cc just like lalr1.cc, but because glr.c stores
+#   the locations in a union, the position and location classes
+#   must not have a constructor.  Therefore, contrary to lalr1.cc, we
+#   must not define "b4_location_constructors".  As a consequence the
+#   user must initialize the first positions (in particular the
+#   filename member).
+
+# We require a pure interface.
+m4_define([b4_pure_flag], [1])
+
+m4_include(b4_skeletonsdir/[c++.m4])
+b4_bison_locations_if([m4_include(b4_skeletonsdir/[location.cc])])
+
+m4_define([b4_parser_class],
+          [b4_percent_define_get([[api.parser.class]])])
+
+# Save the parse parameters.
+m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
+
+# b4_parse_param_wrap
+# -------------------
+# New ones.
+m4_ifset([b4_parse_param],
+[m4_define([b4_parse_param_wrap],
+           [[b4_namespace_ref::b4_parser_class[& yyparser], [[yyparser]]],]
+m4_defn([b4_parse_param]))],
+[m4_define([b4_parse_param_wrap],
+           [[b4_namespace_ref::b4_parser_class[& yyparser], [[yyparser]]]])
+])
+
+# b4_declare_symbol_enum
+# ----------------------
+m4_append([b4_declare_symbol_enum],
+[[typedef symbol_kind_type yysymbol_kind_t;
+]])
+
+
+# b4_yy_symbol_print_define
+# -------------------------
+# Bypass the default implementation to generate the "yy_symbol_print"
+# and "yy_symbol_value_print" functions.
+m4_define([b4_yy_symbol_print_define],
+[[/*--------------------.
+| Print this symbol.  |
+`--------------------*/
+
+static void
+yy_symbol_print (FILE *, ]b4_namespace_ref::b4_parser_class[::symbol_kind_type yytoken,
+                 const ]b4_namespace_ref::b4_parser_class[::semantic_type *yyvaluep]b4_locations_if([[,
+                 const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp]])[]b4_user_formals[)
+{
+]b4_parse_param_use[]dnl
+[  yyparser.yy_symbol_print_ (yytoken, yyvaluep]b4_locations_if([, yylocationp])[);
+}
+]])[
+
+# Hijack the initial action to initialize the locations.
+]b4_bison_locations_if([m4_define([b4_initial_action],
+[yylloc.initialize ();]m4_ifdef([b4_initial_action], [
+m4_defn([b4_initial_action])]))])[
+
+# Hijack the post prologue to declare yyerror.
+]m4_append([b4_post_prologue],
+[b4_syncline([@oline@], [@ofile@])dnl
+[static void
+yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp,
+         ]])[]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param),
+         ])[const char* msg);]])[
+
+]b4_percent_define_flag_if([[global_tokens_and_yystype]], [],
+[m4_define([b4_pre_epilogue],
+[[/* The user is using the C++ token kind, not the C one. */
+#undef ]b4_symbol(0, [id])
+])])[
+
+# Hijack the epilogue to define implementations (yyerror, parser member
+# functions etc.).
+]m4_append([b4_epilogue],
+[b4_syncline([@oline@], [@ofile@])dnl
+[
+/*------------------.
+| Report an error.  |
+`------------------*/
+
+static void
+yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp,
+         ]])[]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param),
+         ])[const char* msg)
+{
+]b4_parse_param_use[]dnl
+[  yyparser.error (]b4_locations_if([[*yylocationp, ]])[msg);
+}
+
+
+]b4_namespace_open[
+]dnl In this section, the parse params are the original parse_params.
+m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
+[  /// Build a parser object.
+  ]b4_parser_class::b4_parser_class[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
+    :])[
+#if ]b4_api_PREFIX[DEBUG
+    ]m4_ifset([b4_parse_param], [  ], [ :])[yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
+#endif]b4_parse_param_cons[
+  {}
+
+  ]b4_parser_class::~b4_parser_class[ ()
+  {}
+
+  ]b4_parser_class[::syntax_error::~syntax_error () YY_NOEXCEPT YY_NOTHROW
+  {}
+
+  int
+  ]b4_parser_class[::operator() ()
+  {
+    return parse ();
+  }
+
+  int
+  ]b4_parser_class[::parse ()
+  {
+    return ::yyparse (*this]b4_user_args[);
+  }
+
+#if ]b4_api_PREFIX[DEBUG
+  /*--------------------.
+  | Print this symbol.  |
+  `--------------------*/
+
+  void
+  ]b4_parser_class[::yy_symbol_value_print_ (symbol_kind_type yykind,
+                           const semantic_type* yyvaluep]b4_locations_if([[,
+                           const location_type* yylocationp]])[) const
+  {]b4_locations_if([[
+    YYUSE (yylocationp);]])[
+    YYUSE (yyvaluep);
+    std::ostream& yyo = debug_stream ();
+    std::ostream& yyoutput = yyo;
+    YYUSE (yyoutput);
+    ]b4_symbol_actions([printer])[
+  }
+
+
+  void
+  ]b4_parser_class[::yy_symbol_print_ (symbol_kind_type yykind,
+                           const semantic_type* yyvaluep]b4_locations_if([[,
+                           const location_type* yylocationp]])[) const
+  {
+    *yycdebug_ << (yykind < YYNTOKENS ? "token" : "nterm")
+               << ' ' << yytname[yykind] << " ("]b4_locations_if([[
+               << *yylocationp << ": "]])[;
+    yy_symbol_value_print_ (yykind, yyvaluep]b4_locations_if([[, yylocationp]])[);
+    *yycdebug_ << ')';
+  }
+
+  std::ostream&
+  ]b4_parser_class[::debug_stream () const
+  {
+    return *yycdebug_;
+  }
+
+  void
+  ]b4_parser_class[::set_debug_stream (std::ostream& o)
+  {
+    yycdebug_ = &o;
+  }
+
+
+  ]b4_parser_class[::debug_level_type
+  ]b4_parser_class[::debug_level () const
+  {
+    return yydebug;
+  }
+
+  void
+  ]b4_parser_class[::set_debug_level (debug_level_type l)
+  {
+    // Actually, it is yydebug which is really used.
+    yydebug = l;
+  }
+
+#endif
+]m4_popdef([b4_parse_param])dnl
+b4_namespace_close[]dnl
+])
+
+
+# b4_shared_declarations(hh|cc)
+# -----------------------------
+# Declaration that might either go into the header (if --defines, $1 = hh)
+# or in the implementation file.
+m4_define([b4_shared_declarations],
+[m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
+b4_percent_code_get([[requires]])[
+#include <iostream>
+#include <stdexcept>
+#include <string>
+
+]b4_cxx_portability[
+]m4_ifdef([b4_location_include],
+          [[# include ]b4_location_include])[
+]b4_variant_if([b4_variant_includes])[
+
+]b4_attribute_define[
+]b4_null_define[
+
+// This skeleton is based on C, yet compiles it as C++.
+// So expect warnings about C style casts.
+#if defined __clang__ && 306 <= __clang_major__ * 100 + __clang_minor__
+# pragma clang diagnostic ignored "-Wold-style-cast"
+#elif defined __GNUC__ && 406 <= __GNUC__ * 100 + __GNUC_MINOR__
+# pragma GCC diagnostic ignored "-Wold-style-cast"
+#endif
+
+// On MacOS, PTRDIFF_MAX is defined as long long, which Clang's
+// -pedantic reports as being a C++11 extension.
+#if defined __APPLE__ && YY_CPLUSPLUS < 201103L \
+    && defined __clang__ && 4 <= __clang_major__
+# pragma clang diagnostic ignored "-Wc++11-long-long"
+#endif
+
+// Whether we are compiled with exception support.
+#ifndef YY_EXCEPTIONS
+# if defined __GNUC__ && !defined __EXCEPTIONS
+#  define YY_EXCEPTIONS 0
+# else
+#  define YY_EXCEPTIONS 1
+# endif
+#endif
+
+]b4_YYDEBUG_define[
+
+]b4_namespace_open[
+
+]b4_bison_locations_if([m4_ifndef([b4_location_file],
+                                  [b4_location_define])])[
+
+  /// A Bison parser.
+  class ]b4_parser_class[
+  {
+  public:
+]b4_public_types_declare[
+
+    /// Build a parser object.
+    ]b4_parser_class[ (]b4_parse_param_decl[);
+    virtual ~]b4_parser_class[ ();
+
+    /// Parse.  An alias for parse ().
+    /// \returns  0 iff parsing succeeded.
+    int operator() ();
+
+    /// Parse.
+    /// \returns  0 iff parsing succeeded.
+    virtual int parse ();
+
+#if ]b4_api_PREFIX[DEBUG
+    /// The current debugging stream.
+    std::ostream& debug_stream () const;
+    /// Set the current debugging stream.
+    void set_debug_stream (std::ostream &);
+
+    /// Type for debugging levels.
+    typedef int debug_level_type;
+    /// The current debugging level.
+    debug_level_type debug_level () const;
+    /// Set the current debugging level.
+    void set_debug_level (debug_level_type l);
+#endif
+
+    /// Report a syntax error.]b4_locations_if([[
+    /// \param loc    where the syntax error is found.]])[
+    /// \param msg    a description of the syntax error.
+    virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
+
+# if ]b4_api_PREFIX[DEBUG
+  public:
+    /// \brief Report a symbol value on the debug stream.
+    /// \param yykind       The symbol kind.
+    /// \param yyvaluep     Its semantic value.]b4_locations_if([[
+    /// \param yylocationp  Its location.]])[
+    virtual void yy_symbol_value_print_ (symbol_kind_type yykind,
+                                         const semantic_type* yyvaluep]b4_locations_if([[,
+                                         const location_type* yylocationp]])[) const;
+    /// \brief Report a symbol on the debug stream.
+    /// \param yykind       The symbol kind.
+    /// \param yyvaluep     Its semantic value.]b4_locations_if([[
+    /// \param yylocationp  Its location.]])[
+    virtual void yy_symbol_print_ (symbol_kind_type yykind,
+                                   const semantic_type* yyvaluep]b4_locations_if([[,
+                                   const location_type* yylocationp]])[) const;
+  private:
+    /// Debug stream.
+    std::ostream* yycdebug_;
+#endif
+
+]b4_parse_param_vars[
+  };
+
+]dnl Redirections for glr.c.
+b4_percent_define_flag_if([[global_tokens_and_yystype]],
+[b4_token_defines
+])[
+]b4_namespace_close[
+
+]dnl Map the name used in c.m4 to the one used in c++.m4.
+[#undef ]b4_symbol(-2, [id])[
+#define ]b4_symbol(-2, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(-2, [id])[
+#undef ]b4_symbol(0, [id])[
+#define ]b4_symbol(0, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(0, [id])[
+#undef ]b4_symbol(1, [id])[
+#define ]b4_symbol(1, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(1, [id])[
+
+#ifndef ]b4_api_PREFIX[STYPE
+# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class[::semantic_type
+#endif
+#ifndef ]b4_api_PREFIX[LTYPE
+# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class[::location_type
+#endif
+
+]m4_define([b4_declare_symbol_enum],
+[[typedef ]b4_namespace_ref[::]b4_parser_class[::symbol_kind_type yysymbol_kind_t;
+#define ]b4_symbol_prefix[YYEMPTY  ]b4_namespace_ref[::]b4_parser_class[::symbol_kind::]b4_symbol_prefix[YYEMPTY
+#define ]b4_symbol_prefix[YYerror  ]b4_namespace_ref[::]b4_parser_class[::symbol_kind::]b4_symbol_prefix[YYerror
+#define ]b4_symbol_prefix[YYEOF    ]b4_namespace_ref[::]b4_parser_class[::symbol_kind::]b4_symbol_prefix[YYEOF
+#define ]b4_symbol_prefix[YYUNDEF  ]b4_namespace_ref[::]b4_parser_class[::symbol_kind::]b4_symbol_prefix[YYUNDEF
+]])[
+]b4_percent_code_get([[provides]])[
+]m4_popdef([b4_parse_param])dnl
+])
+
+b4_defines_if(
+[b4_output_begin([b4_spec_header_file])
+b4_copyright([Skeleton interface for Bison GLR parsers in C++],
+             [2002-2015, 2018-2020])[
+// C++ GLR parser skeleton written by Akim Demaille.
+
+]b4_disclaimer[
+]b4_cpp_guard_open([b4_spec_header_file])[
+]b4_shared_declarations[
+]b4_cpp_guard_close([b4_spec_header_file])[
+]b4_output_end])
+
+# Let glr.c (and b4_shared_declarations) believe that the user
+# arguments include the parser itself.
+m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_wrap]))
+m4_include(b4_skeletonsdir/[glr.c])
+m4_popdef([b4_parse_param])

data/skeletons/java-skel.m4

@@ -2,7 +2,8 @@
 
 # Java skeleton dispatching for Bison.
 
-# Copyright (C) 2007, 2009-2012 Free Software Foundation, Inc.
+# Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+# Inc.
 
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -20,7 +21,7 @@
 b4_glr_if(             [b4_complain([%%glr-parser not supported for Java])])
 b4_nondeterministic_if([b4_complain([%%nondeterministic-parser not supported for Java])])
 
-m4_define_default([b4_used_skeleton], [b4_pkgdatadir/[lalr1.java]])
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.java]])
 m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
 
 m4_include(b4_used_skeleton)

data/skeletons/java.m4

@@ -0,0 +1,495 @@
+                                                            -*- Autoconf -*-
+
+# Java language support for Bison
+
+# Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+m4_include(b4_skeletonsdir/[c-like.m4])
+
+
+# b4_list2(LIST1, LIST2)
+# ----------------------
+# Join two lists with a comma if necessary.
+m4_define([b4_list2],
+          [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
+
+
+# b4_percent_define_get3(DEF, PRE, POST, NOT)
+# -------------------------------------------
+# Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
+# otherwise NOT.
+m4_define([b4_percent_define_get3],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$2[]b4_percent_define_get([$1])[]$3], [$4])])
+
+
+
+# b4_flag_value(BOOLEAN-FLAG)
+# ---------------------------
+m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
+
+
+# b4_parser_class_declaration
+# ---------------------------
+# The declaration of the parser class ("class YYParser"), with all its
+# qualifiers/annotations.
+b4_percent_define_default([[api.parser.abstract]], [[false]])
+b4_percent_define_default([[api.parser.final]],    [[false]])
+b4_percent_define_default([[api.parser.public]],   [[false]])
+b4_percent_define_default([[api.parser.strictfp]], [[false]])
+
+m4_define([b4_parser_class_declaration],
+[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
+b4_percent_define_flag_if([api.parser.public],   [public ])dnl
+b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
+b4_percent_define_flag_if([api.parser.final],    [final ])dnl
+b4_percent_define_flag_if([api.parser.strictfp], [strictfp ])dnl
+[class ]b4_parser_class[]dnl
+b4_percent_define_get3([api.parser.extends], [ extends ])dnl
+b4_percent_define_get3([api.parser.implements], [ implements ])])
+
+
+# b4_lexer_if(TRUE, FALSE)
+# ------------------------
+m4_define([b4_lexer_if],
+[b4_percent_code_ifdef([[lexer]], [$1], [$2])])
+
+
+# b4_identification
+# -----------------
+m4_define([b4_identification],
+[  /** Version number for the Bison executable that generated this parser.  */
+  public static final String bisonVersion = "b4_version";
+
+  /** Name of the skeleton that generated this parser.  */
+  public static final String bisonSkeleton = b4_skeleton;
+])
+
+
+## ------------ ##
+## Data types.  ##
+## ------------ ##
+
+# b4_int_type(MIN, MAX)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# MIN to MAX (included).
+m4_define([b4_int_type],
+[m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
+       b4_ints_in($@, [-32768], [32767]), [1], [short],
+                                               [int])])
+
+# b4_int_type_for(NAME)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# 'NAME_min' to 'NAME_max' (included).
+m4_define([b4_int_type_for],
+[b4_int_type($1_min, $1_max)])
+
+# b4_null
+# -------
+m4_define([b4_null], [null])
+
+
+# b4_typed_parser_table_define(TYPE, NAME, DATA, COMMENT)
+# -------------------------------------------------------
+# We use intermediate functions (e.g., yypact_init) to work around the
+# 64KB limit for JVM methods.  See
+# https://lists.gnu.org/r/help-bison/2008-11/msg00004.html.
+m4_define([b4_typed_parser_table_define],
+[m4_ifval([$4], [b4_comment([$4])
+  ])dnl
+[private static final ]$1[[] yy$2_ = yy$2_init();
+  private static final ]$1[[] yy$2_init()
+  {
+    return new ]$1[[]
+    {
+  ]$3[
+    };
+  }]])
+
+
+# b4_integral_parser_table_define(NAME, DATA, COMMENT)
+#-----------------------------------------------------
+m4_define([b4_integral_parser_table_define],
+[b4_typed_parser_table_define([b4_int_type_for([$2])], [$1], [$2], [$3])])
+
+
+## ------------- ##
+## Token kinds.  ##
+## ------------- ##
+
+
+# b4_token_enum(TOKEN-NUM)
+# ------------------------
+# Output the definition of this token as an enum.
+m4_define([b4_token_enum],
+[b4_token_visible_if([$1],
+    [m4_format([[    /** Token %s, to be returned by the scanner.  */
+    static final int %s = %s%s;
+]],
+               b4_symbol([$1], [tag]),
+               b4_symbol([$1], [id]),
+               b4_symbol([$1], b4_api_token_raw_if([[number]], [[user_number]])))])])
+
+
+# b4_token_enums
+# --------------
+# Output the definition of the tokens (if there are) as enums.
+m4_define([b4_token_enums],
+[b4_any_token_visible_if([    /* Token kinds.  */
+b4_symbol_foreach([b4_token_enum])])])
+
+
+
+## -------------- ##
+## Symbol kinds.  ##
+## -------------- ##
+
+# b4_symbol_enum(SYMBOL-NUM)
+# --------------------------
+# Output the definition of this symbol as an enum.
+m4_define([b4_symbol_enum],
+[m4_format([    %-30s %s],
+           m4_format([[%s(%s)%s]],
+                     b4_symbol([$1], [kind]),
+                     [$1],
+                     m4_if([$1], b4_last_symbol, [[;]], [[,]])),
+           [b4_symbol_tag_comment([$1])])])
+
+
+# b4_declare_symbol_enum
+# ----------------------
+# The definition of the symbol internal numbers as an enum.
+m4_define([b4_declare_symbol_enum],
+[[  public enum SymbolKind
+  {
+]b4_symbol_foreach([b4_symbol_enum])[
+
+    private final int yycode_;
+
+    SymbolKind (int n) {
+      this.yycode_ = n;
+    }
+
+    private static final SymbolKind[] values_ = {
+      ]m4_map_args_sep([b4_symbol_kind(], [)], [,
+      ], b4_symbol_numbers)[
+    };
+
+    static final SymbolKind get(int code) {
+      return values_[code];
+    }
+
+    public final int getCode() {
+      return this.yycode_;
+    }
+
+]b4_parse_error_bmatch(
+[simple\|verbose],
+[[    /* Return YYSTR after stripping away unnecessary quotes and
+       backslashes, so that it's suitable for yyerror.  The heuristic is
+       that double-quoting is unnecessary unless the string contains an
+       apostrophe, a comma, or backslash (other than backslash-backslash).
+       YYSTR is taken from yytname.  */
+    private static String yytnamerr_(String yystr)
+    {
+      if (yystr.charAt (0) == '"')
+        {
+          StringBuffer yyr = new StringBuffer();
+          strip_quotes: for (int i = 1; i < yystr.length(); i++)
+            switch (yystr.charAt(i))
+              {
+              case '\'':
+              case ',':
+                break strip_quotes;
+
+              case '\\':
+                if (yystr.charAt(++i) != '\\')
+                  break strip_quotes;
+                /* Fall through.  */
+              default:
+                yyr.append(yystr.charAt(i));
+                break;
+
+              case '"':
+                return yyr.toString();
+              }
+        }
+      return yystr;
+    }
+
+    /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+       First, the terminals, then, starting at \a YYNTOKENS_, nonterminals.  */
+    ]b4_typed_parser_table_define([String], [tname], [b4_tname])[
+
+    /* The user-facing name of this symbol.  */
+    public final String getName() {
+      return yytnamerr_(yytname_[yycode_]);
+    }
+]],
+[custom\|detailed],
+[[    /* YYNAMES_[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+       First, the terminals, then, starting at \a YYNTOKENS_, nonterminals.  */
+    ]b4_typed_parser_table_define([String], [names], [b4_symbol_names])[
+
+    /* The user-facing name of this symbol.  */
+    public final String getName() {
+      return yynames_[yycode_];
+    }]])[
+  };
+]])])
+
+
+
+# b4_case(ID, CODE)
+# -----------------
+# We need to fool Java's stupid unreachable code detection.
+m4_define([b4_case],
+[  case $1:
+  if (yyn == $1)
+    $2;
+  break;
+])
+
+
+# b4_predicate_case(LABEL, CONDITIONS)
+# ------------------------------------
+m4_define([b4_predicate_case],
+[  case $1:
+     if (! ($2)) YYERROR;
+    break;
+])
+
+
+## -------- ##
+## Checks.  ##
+## -------- ##
+
+b4_percent_define_check_kind([[api.value.type]],    [code], [deprecated])
+
+b4_percent_define_check_kind([[annotations]],       [code], [deprecated])
+b4_percent_define_check_kind([[extends]],           [code], [deprecated])
+b4_percent_define_check_kind([[implements]],        [code], [deprecated])
+b4_percent_define_check_kind([[init_throws]],       [code], [deprecated])
+b4_percent_define_check_kind([[lex_throws]],        [code], [deprecated])
+b4_percent_define_check_kind([[api.parser.class]],  [code], [deprecated])
+b4_percent_define_check_kind([[throws]],            [code], [deprecated])
+
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+m4_define([b4_yystype], [b4_percent_define_get([[api.value.type]])])
+b4_percent_define_default([[api.value.type]], [[Object]])
+b4_percent_define_default([[api.symbol.prefix]], [[S_]])
+
+# b4_api_prefix, b4_api_PREFIX
+# ----------------------------
+# Corresponds to %define api.prefix
+b4_percent_define_default([[api.prefix]], [[YY]])
+m4_define([b4_api_prefix],
+[b4_percent_define_get([[api.prefix]])])
+m4_define([b4_api_PREFIX],
+[m4_toupper(b4_api_prefix)])
+
+# b4_prefix
+# ---------
+# If the %name-prefix is not given, it is api.prefix.
+m4_define_default([b4_prefix], [b4_api_prefix])
+
+b4_percent_define_default([[api.parser.class]], [b4_prefix[]Parser])
+m4_define([b4_parser_class], [b4_percent_define_get([[api.parser.class]])])
+
+b4_percent_define_default([[lex_throws]], [[java.io.IOException]])
+m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])
+
+b4_percent_define_default([[throws]], [])
+m4_define([b4_throws], [b4_percent_define_get([[throws]])])
+
+b4_percent_define_default([[init_throws]], [])
+m4_define([b4_init_throws], [b4_percent_define_get([[init_throws]])])
+
+b4_percent_define_default([[api.location.type]], [Location])
+m4_define([b4_location_type], [b4_percent_define_get([[api.location.type]])])
+
+b4_percent_define_default([[api.position.type]], [Position])
+m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])
+
+
+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+# b4_symbol_translate(STRING)
+# ---------------------------
+# Used by "bison" in the array of symbol names to mark those that
+# require translation.
+m4_define([b4_symbol_translate],
+[[i18n($1)]])
+
+
+# b4_trans(STRING)
+# ----------------
+# Translate a string if i18n is enabled.  Avoid collision with b4_translate.
+m4_define([b4_trans],
+[b4_has_translations_if([i18n($1)], [$1])])
+
+
+
+# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
+# ----------------------------------------------
+# See README.
+m4_define([b4_symbol_value],
+[m4_ifval([$3],
+          [(($3)($1))],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [((b4_symbol([$2], [type]))($1))],
+                                  [$1])],
+                    [$1])])])
+
+
+# b4_lhs_value([SYMBOL-NUM], [TYPE])
+# ----------------------------------
+# See README.
+m4_define([b4_lhs_value], [yyval])
+
+
+# b4_rhs_data(RULE-LENGTH, POS)
+# -----------------------------
+# See README.
+m4_define([b4_rhs_data],
+[yystack.valueAt (b4_subtract($@))])
+
+# b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])
+# --------------------------------------------------
+# See README.
+#
+# In this simple implementation, %token and %type have class names
+# between the angle brackets.
+m4_define([b4_rhs_value],
+[b4_symbol_value([b4_rhs_data([$1], [$2])], [$3], [$4])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[(yyloc)])
+
+
+# b4_rhs_location(RULE-LENGTH, POS)
+# ---------------------------------
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+[yystack.locationAt (b4_subtract($@))])
+
+
+# b4_lex_param
+# b4_parse_param
+# --------------
+# If defined, b4_lex_param arrives double quoted, but below we prefer
+# it to be single quoted.  Same for b4_parse_param.
+
+# TODO: should be in bison.m4
+m4_define_default([b4_lex_param], [[]])
+m4_define([b4_lex_param], b4_lex_param)
+m4_define([b4_parse_param], b4_parse_param)
+
+# b4_lex_param_decl
+# -----------------
+# Extra formal arguments of the constructor.
+m4_define([b4_lex_param_decl],
+[m4_ifset([b4_lex_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_lex_param))],
+          [$1])])
+
+m4_define([b4_param_decls],
+          [m4_map([b4_param_decl], [$@])])
+m4_define([b4_param_decl], [, $1])
+
+m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
+
+
+
+# b4_parse_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+m4_define([b4_parse_param_decl],
+[m4_ifset([b4_parse_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_parse_param))],
+          [$1])])
+
+
+
+# b4_lex_param_call
+# -----------------
+# Delegating the lexer parameters to the lexer constructor.
+m4_define([b4_lex_param_call],
+          [m4_ifset([b4_lex_param],
+                    [b4_remove_comma([$1],
+                                     b4_param_calls(b4_lex_param))],
+                    [$1])])
+m4_define([b4_param_calls],
+          [m4_map([b4_param_call], [$@])])
+m4_define([b4_param_call], [, $2])
+
+
+
+# b4_parse_param_cons
+# -------------------
+# Extra initialisations of the constructor.
+m4_define([b4_parse_param_cons],
+          [m4_ifset([b4_parse_param],
+                    [b4_constructor_calls(b4_parse_param)])])
+
+m4_define([b4_constructor_calls],
+          [m4_map([b4_constructor_call], [$@])])
+m4_define([b4_constructor_call],
+          [this.$2 = $2;
+          ])
+
+
+
+# b4_parse_param_vars
+# -------------------
+# Extra instance variables.
+m4_define([b4_parse_param_vars],
+          [m4_ifset([b4_parse_param],
+                    [
+    /* User arguments.  */
+b4_var_decls(b4_parse_param)])])
+
+m4_define([b4_var_decls],
+          [m4_map_sep([b4_var_decl], [
+], [$@])])
+m4_define([b4_var_decl],
+          [    protected final $1;])
+
+
+
+# b4_maybe_throws(THROWS)
+# -----------------------
+# Expand to either an empty string or "throws THROWS".
+m4_define([b4_maybe_throws],
+          [m4_ifval($1, [ throws $1])])

data/skeletons/lalr1.d

@@ -0,0 +1,921 @@
+# D skeleton for Bison -*- autoconf -*-
+
+# Copyright (C) 2007-2012, 2019-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+m4_include(b4_skeletonsdir/[d.m4])
+
+
+b4_output_begin([b4_parser_file_name])
+b4_copyright([Skeleton implementation for Bison LALR(1) parsers in D],
+             [2007-2012, 2019-2020])[
+]b4_disclaimer[
+]b4_percent_define_ifdef([package], [module b4_percent_define_get([package]);
+])[
+version(D_Version2) {
+} else {
+  static assert(false, "need compiler for D Version 2");
+}
+
+]b4_user_pre_prologue[
+]b4_user_post_prologue[
+]b4_percent_code_get([[imports]])[
+import std.format;
+
+/**
+ * A Bison parser, automatically generated from <tt>]m4_bpatsubst(b4_file_name, [^"\(.*\)"$], [\1])[</tt>.
+ *
+ * @@author LALR (1) parser skeleton written by Paolo Bonzini.
+ * Port to D language was done by Oliver Mangold.
+ */
+
+/**
+ * Communication interface between the scanner and the Bison-generated
+ * parser <tt>]b4_parser_class[</tt>.
+ */
+public interface Lexer
+{]b4_locations_if([[
+  /**
+   * Method to retrieve the beginning position of the last scanned token.
+   * @@return the position at which the last scanned token starts.  */
+  @@property ]b4_position_type[ startPos ();
+
+  /**
+   * Method to retrieve the ending position of the last scanned token.
+   * @@return the first position beyond the last scanned token.  */
+  @@property ]b4_position_type[ endPos ();
+
+]])[
+  /**
+   * Method to retrieve the semantic value of the last scanned token.
+   * @@return the semantic value of the last scanned token.  */
+  @@property ]b4_yystype[ semanticVal ();
+
+  /**
+   * Entry point for the scanner.  Returns the token identifier corresponding
+   * to the next token and prepares to return the semantic value
+   * ]b4_locations_if([and beginning/ending positions ])[of the token.
+   * @@return the token identifier corresponding to the next token. */
+  int yylex ();
+
+  /**
+   * Entry point for error reporting.  Emits an error
+   * ]b4_locations_if([referring to the given location ])[in a user-defined way.
+   *]b4_locations_if([[
+   * @@param loc The location of the element to which the
+   *                error message is related]])[
+   * @@param s The string for the error message.  */
+   void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[string s);
+}
+
+]b4_locations_if([b4_position_type_if([[
+static assert(__traits(compiles,
+              (new ]b4_position_type[[1])[0]=(new ]b4_position_type[[1])[0]),
+              "struct/class ]b4_position_type[ must be default-constructible "
+              "and assignable");
+static assert(__traits(compiles, (new string[1])[0]=(new ]b4_position_type[).toString()),
+              "error: struct/class ]b4_position_type[ must have toString method");
+]], [[
+  /**
+   * A struct denoting a point in the input.*/
+public struct ]b4_position_type[ {
+
+  /** The column index within the line of input.  */
+  public int column = 1;
+  /** The line number within an input file.  */
+  public int line = 1;
+  /** The name of the input file.  */
+  public string filename = null;
+
+  /**
+   * A string representation of the position. */
+  public string toString() const {
+    if (filename)
+      return format("%s:%d.%d", filename, line, column);
+    else
+      return format("%d.%d", line, column);
+  }
+}
+]])b4_location_type_if([[
+static assert(__traits(compiles, (new ]b4_location_type[((new ]b4_position_type[[1])[0]))) &&
+              __traits(compiles, (new ]b4_location_type[((new ]b4_position_type[[1])[0], (new ]b4_position_type[[1])[0]))),
+              "error: struct/class ]b4_location_type[ must have "
+              "default constructor and constructors this(]b4_position_type[) and this(]b4_position_type[, ]b4_position_type[).");
+static assert(__traits(compiles, (new ]b4_location_type[[1])[0].begin=(new ]b4_location_type[[1])[0].begin) &&
+              __traits(compiles, (new ]b4_location_type[[1])[0].begin=(new ]b4_location_type[[1])[0].end) &&
+              __traits(compiles, (new ]b4_location_type[[1])[0].end=(new ]b4_location_type[[1])[0].begin) &&
+              __traits(compiles, (new ]b4_location_type[[1])[0].end=(new ]b4_location_type[[1])[0].end),
+              "error: struct/class ]b4_location_type[ must have assignment-compatible "
+              "members/properties 'begin' and 'end'.");
+static assert(__traits(compiles, (new string[1])[0]=(new ]b4_location_type[[1])[0].toString()),
+              "error: struct/class ]b4_location_type[ must have toString method.");
+
+private immutable bool yy_location_is_class = !__traits(compiles, *(new ]b4_location_type[((new ]b4_position_type[[1])[0])));]], [[
+/**
+ * A class defining a pair of positions.  Positions, defined by the
+ * <code>]b4_position_type[</code> class, denote a point in the input.
+ * Locations represent a part of the input through the beginning
+ * and ending positions.  */
+public class ]b4_location_type[
+{
+  /** The first, inclusive, position in the range.  */
+  public ]b4_position_type[ begin;
+
+  /** The first position beyond the range.  */
+  public ]b4_position_type[ end;
+
+  /**
+   * Create a <code>]b4_location_type[</code> denoting an empty range located at
+   * a given point.
+   * @@param loc The position at which the range is anchored.  */
+  public this (]b4_position_type[ loc) {
+    this.begin = this.end = loc;
+  }
+
+  public this () {
+  }
+
+  /**
+   * Create a <code>]b4_location_type[</code> from the endpoints of the range.
+   * @@param begin The first position included in the range.
+   * @@param end   The first position beyond the range.  */
+  public this (]b4_position_type[ begin, ]b4_position_type[ end)
+  {
+    this.begin = begin;
+    this.end = end;
+  }
+
+  /**
+   * A representation of the location. For this to be correct,
+   * <code>]b4_position_type[</code> should override the <code>toString</code>
+   * method.  */
+  public override string toString () const {
+    auto end_col = 0 < end.column ? end.column - 1 : 0;
+    auto res = begin.toString ();
+    if (end.filename && begin.filename != end.filename)
+      res ~= "-" ~ format("%s:%d.%d", end.filename, end.line, end_col);
+    else if (begin.line < end.line)
+      res ~= "-" ~ format("%d.%d", end.line, end_col);
+    else if (begin.column < end_col)
+      res ~= "-" ~ format("%d", end_col);
+    return res;
+  }
+}
+
+private immutable bool yy_location_is_class = true;
+
+]])])m4_ifdef([b4_user_union_members], [private union YYSemanticType
+{
+b4_user_union_members
+};],
+[m4_if(b4_tag_seen_flag, 0,
+[[private alias int YYSemanticType;]])])[
+]b4_token_enums[
+]b4_parser_class_declaration[
+{
+  ]b4_identification[
+
+]b4_declare_symbol_enum[
+
+]b4_locations_if([[
+  private final ]b4_location_type[ yylloc_from_stack (ref YYStack rhs, int n)
+  {
+    static if (yy_location_is_class) {
+      if (n > 0)
+        return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
+      else
+        return new ]b4_location_type[ (rhs.locationAt (0).end);
+    } else {
+      if (n > 0)
+        return ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
+      else
+        return ]b4_location_type[ (rhs.locationAt (0).end);
+    }
+  }]])[
+
+]b4_lexer_if([[  private class YYLexer implements Lexer {
+]b4_percent_code_get([[lexer]])[
+  }
+]])[
+  /** The object doing lexical analysis for us.  */
+  private Lexer yylexer;
+
+]b4_parse_param_vars[
+
+]b4_lexer_if([[
+  /**
+   * Instantiate the Bison-generated parser.
+   */
+  public this] (b4_parse_param_decl([b4_lex_param_decl])[) {
+    this (new YYLexer(]b4_lex_param_call[));
+  }
+]])[
+
+  /**
+   * Instantiate the Bison-generated parser.
+   * @@param yylexer The scanner that will supply tokens to the parser.
+   */
+  ]b4_lexer_if([[protected]], [[public]]) [this (]b4_parse_param_decl([[Lexer yylexer]])[) {
+    this.yylexer = yylexer;]b4_parse_trace_if([[
+    this.yyDebugStream = stderr;]])[
+]b4_parse_param_cons[
+  }
+]b4_parse_trace_if([[
+  private File yyDebugStream;
+
+  /**
+   * The <tt>File</tt> on which the debugging output is
+   * printed.
+   */
+  public File getDebugStream () { return yyDebugStream; }
+
+  /**
+   * Set the <tt>std.File</tt> on which the debug output is printed.
+   * @@param s The stream that is used for debugging output.
+   */
+  public final void setDebugStream(File s) { yyDebugStream = s; }
+
+  private int yydebug = 0;
+
+  /**
+   * Answer the verbosity of the debugging output; 0 means that all kinds of
+   * output from the parser are suppressed.
+   */
+  public final int getDebugLevel() { return yydebug; }
+
+  /**
+   * Set the verbosity of the debugging output; 0 means that all kinds of
+   * output from the parser are suppressed.
+   * @@param level The verbosity level for debugging output.
+   */
+  public final void setDebugLevel(int level) { yydebug = level; }
+
+  protected final void yycdebug (string s) {
+    if (0 < yydebug)
+      yyDebugStream.write (s);
+  }
+
+  protected final void yycdebugln (string s) {
+    if (0 < yydebug)
+      yyDebugStream.writeln (s);
+  }
+]])[
+  private final int yylex () {
+    return yylexer.yylex ();
+  }
+
+  protected final void yyerror (]b4_locations_if(ref [b4_location_type[ loc, ]])[string s) {
+    yylexer.yyerror (]b4_locations_if([loc, ])[s);
+  }
+
+  /**
+   * Returned by a Bison action in order to stop the parsing process and
+   * return success (<tt>true</tt>).  */
+  public static immutable int YYACCEPT = 0;
+
+  /**
+   * Returned by a Bison action in order to stop the parsing process and
+   * return failure (<tt>false</tt>).  */
+  public static immutable int YYABORT = 1;
+
+  /**
+   * Returned by a Bison action in order to start error recovery without
+   * printing an error message.  */
+  public static immutable int YYERROR = 2;
+
+  // Internal return codes that are not supported for user semantic
+  // actions.
+  private static immutable int YYERRLAB = 3;
+  private static immutable int YYNEWSTATE = 4;
+  private static immutable int YYDEFAULT = 5;
+  private static immutable int YYREDUCE = 6;
+  private static immutable int YYERRLAB1 = 7;
+  private static immutable int YYRETURN = 8;
+]b4_locations_if([
+  private static immutable YYSemanticType yy_semantic_null;])[
+  private int yyerrstatus_ = 0;
+
+  /**
+   * Whether error recovery is being done.  In this state, the parser
+   * reads token until it reaches a known state, and then restarts normal
+   * operation.  */
+  public final bool recovering ()
+  {
+    return yyerrstatus_ == 0;
+  }
+
+  private int yyaction (int yyn, ref YYStack yystack, int yylen)
+  {
+    ]b4_yystype[ yyval;]b4_locations_if([[
+    ]b4_location_type[ yyloc = yylloc_from_stack (yystack, yylen);]])[
+
+    /* If YYLEN is nonzero, implement the default value of the action:
+       `$$ = $1'.  Otherwise, use the top of the stack.
+
+       Otherwise, the following line sets YYVAL to garbage.
+       This behavior is undocumented and Bison
+       users should not rely upon it.  */
+    if (yylen > 0)
+      yyval = yystack.valueAt (yylen - 1);
+    else
+      yyval = yystack.valueAt (0);
+
+]b4_parse_trace_if([[
+    yy_reduce_print (yyn, yystack);]])[
+
+    switch (yyn)
+    {
+]b4_user_actions[
+      default: break;
+    }
+
+]b4_parse_trace_if([[
+    import std.conv : to;
+    yy_symbol_print ("-> $$ =", to!SymbolKind (yyr1_[yyn]), yyval]b4_locations_if([, yyloc])[);]])[
+
+    yystack.pop (yylen);
+    yylen = 0;
+
+    /* Shift the result of the reduction.  */
+    yyn = yyr1_[yyn];
+    int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
+    if (0 <= yystate && yystate <= yylast_
+        && yycheck_[yystate] == yystack.stateAt (0))
+      yystate = yytable_[yystate];
+    else
+      yystate = yydefgoto_[yyn - yyntokens_];
+
+    yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
+    return YYNEWSTATE;
+  }
+
+  /* Return YYSTR after stripping away unnecessary quotes and
+     backslashes, so that it's suitable for yyerror.  The heuristic is
+     that double-quoting is unnecessary unless the string contains an
+     apostrophe, a comma, or backslash (other than backslash-backslash).
+     YYSTR is taken from yytname.  */
+  private final string yytnamerr_ (string yystr)
+  {
+    if (yystr[0] == '"')
+      {
+        string yyr;
+      strip_quotes:
+        for (int i = 1; i < yystr.length; i++)
+          switch (yystr[i])
+            {
+            case '\'':
+            case ',':
+              break strip_quotes;
+
+            case '\\':
+              if (yystr[++i] != '\\')
+                break strip_quotes;
+              goto default;
+            default:
+              yyr ~= yystr[i];
+              break;
+
+            case '"':
+              return yyr;
+            }
+      }
+    else if (yystr == "$end")
+      return "end of input";
+
+    return yystr;
+  }
+]b4_parse_trace_if([[
+  /*--------------------------------.
+  | Print this symbol on YYOUTPUT.  |
+  `--------------------------------*/
+
+  private final void yy_symbol_print (string s, SymbolKind yykind,
+    ref ]b4_yystype[ yyvaluep]dnl
+b4_locations_if([, ref ]b4_location_type[ yylocationp])[)
+  {
+    if (0 < yydebug)
+    {
+      string message = s ~ (yykind < yyntokens_ ? " token " : " nterm ")
+              ~ yytname_[yykind] ~ " ("]b4_locations_if([
+              ~ yylocationp.toString() ~ ": "])[;
+      static if (__traits(compiles, message ~= yyvaluep.toString ()))
+              message ~= yyvaluep.toString ();
+      else
+              message ~= format ("%s", &yyvaluep);
+      message ~= ")";
+      yycdebugln (message);
+    }
+  }
+]])[
+  /**
+   * Parse input from the scanner that was specified at object construction
+   * time.  Return whether the end of the input was reached successfully.
+   *
+   * @@return <tt>true</tt> if the parsing succeeds.  Note that this does not
+   *          imply that there were no syntax errors.
+   */
+  public bool parse ()
+  {
+    /// Lookahead and lookahead in internal form.
+    int yychar = TokenKind.YYEMPTY;
+    SymbolKind yytoken = SymbolKind.]b4_symbol(-2, kind)[;
+
+    /* State.  */
+    int yyn = 0;
+    int yylen = 0;
+    int yystate = 0;
+
+    YYStack yystack;
+
+    /* Error handling.  */
+    int yynerrs_ = 0;]b4_locations_if([[
+    /// The location where the error started.
+    ]b4_location_type[ yyerrloc = null;
+
+    /// ]b4_location_type[ of the lookahead.
+    ]b4_location_type[ yylloc;
+
+    /// @@$.
+    ]b4_location_type[ yyloc;]])[
+
+    /// Semantic value of the lookahead.
+    ]b4_yystype[ yylval;
+
+    bool yyresult;]b4_parse_trace_if([[
+
+    yycdebugln ("Starting parse");]])[
+    yyerrstatus_ = 0;
+
+]m4_ifdef([b4_initial_action], [
+m4_pushdef([b4_at_dollar],     [yylloc])dnl
+m4_pushdef([b4_dollar_dollar], [yylval])dnl
+    /* User initialization code.  */
+    b4_user_initial_action
+m4_popdef([b4_dollar_dollar])dnl
+m4_popdef([b4_at_dollar])])dnl
+
+  [  /* Initialize the stack.  */
+    yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
+
+    int label = YYNEWSTATE;
+    for (;;)
+      final switch (label)
+      {
+        /* New state.  Unlike in the C/C++ skeletons, the state is already
+           pushed when we come here.  */
+      case YYNEWSTATE:]b4_parse_trace_if([[
+        yycdebugln (format("Entering state %d", yystate));
+        if (0 < yydebug)
+          yystack.print (yyDebugStream);]])[
+
+        /* Accept?  */
+        if (yystate == yyfinal_)
+          return true;
+
+        /* Take a decision.  First try without lookahead.  */
+        yyn = yypact_[yystate];
+        if (yy_pact_value_is_default_ (yyn))
+        {
+          label = YYDEFAULT;
+          break;
+        }
+
+        /* Read a lookahead token.  */
+        if (yychar == TokenKind.YYEMPTY)
+        {]b4_parse_trace_if([[
+          yycdebugln ("Reading a token");]])[
+          yychar = yylex ();]b4_locations_if([[
+          static if (yy_location_is_class) {
+            yylloc = new ]b4_location_type[(yylexer.startPos, yylexer.endPos);
+          } else {
+            yylloc = ]b4_location_type[(yylexer.startPos, yylexer.endPos);
+          }]])
+          yylval = yylexer.semanticVal;[
+        }
+
+        /* Convert token to internal form.  */
+        yytoken = yytranslate_ (yychar);]b4_parse_trace_if([[
+        yy_symbol_print ("Next token is", yytoken, yylval]b4_locations_if([, yylloc])[);]])[
+
+        if (yytoken == SymbolKind.]b4_symbol(1, kind)[)
+        {
+          // The scanner already issued an error message, process directly
+          // to error recovery.  But do not keep the error token as
+          // lookahead, it is too special and may lead us to an endless
+          // loop in error recovery. */
+          yychar = TokenKind.YYUNDEF;
+          yytoken = SymbolKind.]b4_symbol_prefix[YYUNDEF;]b4_locations_if([[
+          yyerrloc = yylloc;]])[
+          label = YYERRLAB1;
+        }
+        else
+        {
+          /* If the proper action on seeing token YYTOKEN is to reduce or to
+             detect an error, take that action.  */
+          yyn += yytoken;
+          if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
+            label = YYDEFAULT;
+
+          /* <= 0 means reduce or error.  */
+          else if ((yyn = yytable_[yyn]) <= 0)
+          {
+            if (yy_table_value_is_error_ (yyn))
+              label = YYERRLAB;
+            else
+            {
+              yyn = -yyn;
+              label = YYREDUCE;
+            }
+          }
+          else
+          {
+            /* Shift the lookahead token.  */]b4_parse_trace_if([[
+            yy_symbol_print ("Shifting", yytoken, yylval]b4_locations_if([, yylloc])[);]])[
+
+            /* Discard the token being shifted.  */
+            yychar = TokenKind.YYEMPTY;
+
+            /* Count tokens shifted since error; after three, turn off error
+             * status.  */
+            if (yyerrstatus_ > 0)
+              --yyerrstatus_;
+
+            yystate = yyn;
+            yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
+            label = YYNEWSTATE;
+          }
+        }
+        break;
+
+      /*-----------------------------------------------------------.
+      | yydefault -- do the default action for the current state.  |
+      `-----------------------------------------------------------*/
+      case YYDEFAULT:
+        yyn = yydefact_[yystate];
+        if (yyn == 0)
+          label = YYERRLAB;
+        else
+          label = YYREDUCE;
+        break;
+
+      /*-----------------------------.
+      | yyreduce -- Do a reduction.  |
+      `-----------------------------*/
+      case YYREDUCE:
+        yylen = yyr2_[yyn];
+        label = yyaction (yyn, yystack, yylen);
+        yystate = yystack.stateAt (0);
+        break;
+
+      /*--------------------------------------.
+      | yyerrlab -- here on detecting error.  |
+      `--------------------------------------*/
+      case YYERRLAB:
+        /* If not already recovering from an error, report this error.  */
+        if (yyerrstatus_ == 0)
+        {
+          ++yynerrs_;
+          if (yychar == TokenKind.YYEMPTY)
+            yytoken = SymbolKind.]b4_symbol(-2, kind)[;
+          yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
+        }
+]b4_locations_if([
+        yyerrloc = yylloc;])[
+        if (yyerrstatus_ == 3)
+        {
+          /* If just tried and failed to reuse lookahead token after an
+           * error, discard it.  */
+
+          if (yychar <= TokenKind.]b4_symbol(0, [id])[)
+          {
+            /* Return failure if at end of input.  */
+            if (yychar == TokenKind.]b4_symbol(0, [id])[)
+             return false;
+          }
+          else
+            yychar = TokenKind.YYEMPTY;
+        }
+
+        /* Else will try to reuse lookahead token after shifting the error
+         * token.  */
+        label = YYERRLAB1;
+        break;
+
+      /*-------------------------------------------------.
+      | errorlab -- error raised explicitly by YYERROR.  |
+      `-------------------------------------------------*/
+      case YYERROR:]b4_locations_if([
+        yyerrloc = yystack.locationAt (yylen - 1);])[
+        /* Do not reclaim the symbols of the rule which action triggered
+           this YYERROR.  */
+        yystack.pop (yylen);
+        yylen = 0;
+        yystate = yystack.stateAt (0);
+        label = YYERRLAB1;
+        break;
+
+      /*-------------------------------------------------------------.
+      | yyerrlab1 -- common code for both syntax error and YYERROR.  |
+      `-------------------------------------------------------------*/
+      case YYERRLAB1:
+        yyerrstatus_ = 3;       /* Each real token shifted decrements this.  */
+
+        // Pop stack until we find a state that shifts the error token.
+        for (;;)
+        {
+          yyn = yypact_[yystate];
+          if (!yy_pact_value_is_default_ (yyn))
+          {
+            yyn += SymbolKind.]b4_symbol(1, kind)[;
+            if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == SymbolKind.]b4_symbol(1, kind)[)
+            {
+              yyn = yytable_[yyn];
+              if (0 < yyn)
+                break;
+                  }
+          }
+
+          /* Pop the current state because it cannot handle the error token.  */
+          if (yystack.height == 1)
+            return false;
+
+]b4_locations_if([          yyerrloc = yystack.locationAt (0);])[
+          yystack.pop ();
+          yystate = yystack.stateAt (0);]b4_parse_trace_if([[
+          if (0 < yydebug)
+            yystack.print (yyDebugStream);]])[
+        }
+
+]b4_locations_if([
+        /* Muck with the stack to setup for yylloc.  */
+        yystack.push (0, yy_semantic_null, yylloc);
+        yystack.push (0, yy_semantic_null, yyerrloc);
+        yyloc = yylloc_from_stack (yystack, 2);
+        yystack.pop (2);])[
+
+        /* Shift the error token.  */]b4_parse_trace_if([[
+        import std.conv : to;
+        yy_symbol_print ("Shifting", to!SymbolKind (yystos_[yyn]), yylval]b4_locations_if([, yyloc])[);]])[
+        yystate = yyn;
+        yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
+        label = YYNEWSTATE;
+        break;
+
+      /* Accept.  */
+      case YYACCEPT:
+        yyresult = true;
+        label = YYRETURN;
+        break;
+
+      /* Abort.  */
+      case YYABORT:
+        yyresult = false;
+        label = YYRETURN;
+        break;
+
+      case YYRETURN:]b4_parse_trace_if([[
+        if (0 < yydebug)
+          yystack.print (yyDebugStream);]])[
+        return yyresult;
+    }
+  }
+
+  // Generate an error message.
+  private final string yysyntax_error (int yystate, SymbolKind tok)
+  {]b4_parse_error_case([verbose], [[
+    /* There are many possibilities here to consider:
+       - Assume YYFAIL is not used.  It's too flawed to consider.
+         See
+         <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
+         for details.  YYERROR is fine as it does not invoke this
+         function.
+       - If this state is a consistent state with a default action,
+         then the only way this function was invoked is if the
+         default action is an error action.  In that case, don't
+         check for expected tokens because there are none.
+       - The only way there can be no lookahead present (in tok) is
+         if this state is a consistent state with a default action.
+         Thus, detecting the absence of a lookahead is sufficient to
+         determine that there is no unexpected or expected token to
+         report.  In that case, just report a simple "syntax error".
+       - Don't assume there isn't a lookahead just because this
+         state is a consistent state with a default action.  There
+         might have been a previous inconsistent state, consistent
+         state with a non-default action, or user semantic action
+         that manipulated yychar.  (However, yychar is currently out
+         of scope during semantic actions.)
+       - Of course, the expected token list depends on states to
+         have correct lookahead information, and it depends on the
+         parser not to perform extra reductions after fetching a
+         lookahead from the scanner and before detecting a syntax
+         error.  Thus, state merging (from LALR or IELR) and default
+         reductions corrupt the expected token list.  However, the
+         list is correct for canonical LR with one exception: it
+         will still contain any token that will not be accepted due
+         to an error action in a later state.
+      */
+    if (tok != SymbolKind.]b4_symbol(-2, kind)[)
+    {
+      // FIXME: This method of building the message is not compatible
+      // with internationalization.
+      string res = "syntax error, unexpected ";
+      res ~= yytnamerr_ (yytname_[tok]);
+      int yyn = yypact_[yystate];
+      if (!yy_pact_value_is_default_ (yyn))
+      {
+        /* Start YYX at -YYN if negative to avoid negative
+           indexes in YYCHECK.  In other words, skip the first
+           -YYN actions for this state because they are default
+           actions.  */
+        int yyxbegin = yyn < 0 ? -yyn : 0;
+        /* Stay within bounds of both yycheck and yytname.  */
+        int yychecklim = yylast_ - yyn + 1;
+        int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
+        int count = 0;
+        for (int x = yyxbegin; x < yyxend; ++x)
+          if (yycheck_[x + yyn] == x && x != SymbolKind.]b4_symbol(1, kind)[
+              && !yy_table_value_is_error_ (yytable_[x + yyn]))
+             ++count;
+          if (count < 5)
+          {
+             count = 0;
+             for (int x = yyxbegin; x < yyxend; ++x)
+               if (yycheck_[x + yyn] == x && x != SymbolKind.]b4_symbol(1, kind)[
+                   && !yy_table_value_is_error_ (yytable_[x + yyn]))
+               {
+                  res ~= count++ == 0 ? ", expecting " : " or ";
+                  res ~= yytnamerr_ (yytname_[x]);
+               }
+          }
+      }
+      return res;
+    }]])[
+    return "syntax error";
+  }
+
+  /**
+   * Whether the given <code>yypact_</code> value indicates a defaulted state.
+   * @@param yyvalue   the value to check
+   */
+  private static bool yy_pact_value_is_default_ (int yyvalue)
+  {
+    return yyvalue == yypact_ninf_;
+  }
+
+  /**
+   * Whether the given <code>yytable_</code> value indicates a syntax error.
+   * @@param yyvalue   the value to check
+   */
+  private static bool yy_table_value_is_error_ (int yyvalue)
+  {
+    return yyvalue == yytable_ninf_;
+  }
+
+  /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
+     STATE-NUM.  */
+  private static immutable ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
+
+  /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
+     positive, shift that token.  If negative, reduce the rule which
+     number is the opposite.  If YYTABLE_NINF_, syntax error.  */
+  private static immutable ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
+
+  ]b4_parser_tables_define[
+
+  /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+     First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
+  private static immutable string[] yytname_ =
+  @{
+  ]b4_tname[
+  @};
+
+]b4_parse_trace_if([[
+  /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
+  private static immutable ]b4_int_type_for([b4_rline])[[] yyrline_ =
+  @{
+  ]b4_rline[
+  @};
+
+  // Report on the debug stream that the rule yyrule is going to be reduced.
+  private final void yy_reduce_print (int yyrule, ref YYStack yystack)
+  {
+    if (yydebug == 0)
+      return;
+
+    int yylno = yyrline_[yyrule];
+    int yynrhs = yyr2_[yyrule];
+    /* Print the symbols being reduced, and their result.  */
+    yycdebugln (format("Reducing stack by rule %d (line %d):",
+                yyrule - 1, yylno));
+
+    /* The symbols being reduced.  */
+    import std.conv : to;
+    for (int yyi = 0; yyi < yynrhs; yyi++)
+      yy_symbol_print (format("   $%d =", yyi + 1),
+                       to!SymbolKind (yystos_[yystack.stateAt(yynrhs - (yyi + 1))]),
+                       ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
+                       b4_rhs_location(yynrhs, yyi + 1)])[);
+  }
+]])[
+
+  private static SymbolKind yytranslate_ (int t)
+  {
+]b4_api_token_raw_if(
+[[    import std.conv : to;
+    return to!SymbolKind (t);]],
+[[    /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
+    immutable ]b4_int_type_for([b4_translate])[[] translate_table =
+    @{
+  ]b4_translate[
+    @};
+
+    immutable int user_token_number_max_ = ]b4_user_token_number_max[;
+
+    if (t <= 0)
+      return SymbolKind.]b4_symbol_prefix[YYEOF;
+    else if (t <= user_token_number_max_)
+      {
+        import std.conv : to;
+        return to!SymbolKind (translate_table[t]);
+      }
+    else
+      return SymbolKind.]b4_symbol_prefix[YYUNDEF;]])[
+  }
+
+  private static immutable int yylast_ = ]b4_last[;
+  private static immutable int yynnts_ = ]b4_nterms_number[;
+  private static immutable int yyfinal_ = ]b4_final_state_number[;
+  private static immutable int yyntokens_ = ]b4_tokens_number[;
+
+  private final struct YYStackElement {
+    int state;
+    ]b4_yystype[ value;]b4_locations_if(
+    b4_location_type[[] location;])[
+  }
+
+  private final struct YYStack {
+    private YYStackElement[] stack = [];
+
+    public final @@property ulong height()
+    {
+      return stack.length;
+    }
+
+    public final void push (int state, ]b4_yystype[ value]dnl
+  b4_locations_if([, ref ]b4_location_type[ loc])[)
+    {
+      stack ~= YYStackElement(state, value]b4_locations_if([, loc])[);
+    }
+
+    public final void pop ()
+    {
+      pop (1);
+    }
+
+    public final void pop (int num)
+    {
+      stack.length -= num;
+    }
+
+    public final int stateAt (int i)
+    {
+      return stack[$-i-1].state;
+    }
+
+]b4_locations_if([[
+    public final ref ]b4_location_type[ locationAt (int i)
+    {
+      return stack[$-i-1].location;
+    }]])[
+
+    public final ref ]b4_yystype[ valueAt (int i)
+    {
+      return stack[$-i-1].value;
+    }
+]b4_parse_trace_if([[
+    // Print the state stack on the debug stream.
+    public final void print (File stream)
+    {
+      stream.write ("Stack now");
+      for (int i = 0; i < stack.length; i++)
+        stream.write (" ", stack[i].state);
+      stream.writeln ();
+    }]])[
+  }
+]b4_percent_code_get[
+}
+]b4_percent_code_get([[epilogue]])[]dnl
+b4_epilogue[]dnl
+b4_output_end

data/skeletons/location.cc

@@ -0,0 +1,373 @@
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+m4_pushdef([b4_copyright_years],
+           [2002-2015, 2018-2020])
+
+
+# b4_position_file
+# ----------------
+# Name of the file containing the position class, if we want this file.
+b4_defines_if([b4_required_version_if([302], [],
+                                      [m4_define([b4_position_file], [position.hh])])])])
+
+
+# b4_location_file
+# ----------------
+# Name of the file containing the position/location class,
+# if we want this file.
+b4_percent_define_check_file([b4_location_file],
+                             [[api.location.file]],
+                             b4_defines_if([[location.hh]]))
+
+# b4_location_include
+# -------------------
+# If location.hh is to be generated, the name under which should it be
+# included.
+#
+# b4_location_path
+# ----------------
+# The path to use for the CPP guard.
+m4_ifdef([b4_location_file],
+[m4_define([b4_location_include],
+           [b4_percent_define_get([[api.location.include]],
+                                  ["b4_location_file"])])
+ m4_define([b4_location_path],
+           b4_percent_define_get([[api.location.include]],
+                                 ["b4_dir_prefix[]b4_location_file"]))
+ m4_define([b4_location_path],
+           m4_substr(m4_defn([b4_location_path]), 1, m4_eval(m4_len(m4_defn([b4_location_path])) - 2)))
+ ])
+
+
+
+# b4_location_define
+# ------------------
+# Define the position and location classes.
+m4_define([b4_location_define],
+[[  /// A point in a source file.
+  class position
+  {
+  public:
+    /// Type for line and column numbers.
+    typedef int counter_type;
+]m4_ifdef([b4_location_constructors], [[
+    /// Construct a position.
+    explicit position (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
+                       counter_type l = ]b4_location_initial_line[,
+                       counter_type c = ]b4_location_initial_column[)
+      : filename (f)
+      , line (l)
+      , column (c)
+    {}
+
+]])[
+    /// Initialization.
+    void initialize (]b4_percent_define_get([[filename_type]])[* fn = YY_NULLPTR,
+                     counter_type l = ]b4_location_initial_line[,
+                     counter_type c = ]b4_location_initial_column[)
+    {
+      filename = fn;
+      line = l;
+      column = c;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+    /// (line related) Advance to the COUNT next lines.
+    void lines (counter_type count = 1)
+    {
+      if (count)
+        {
+          column = ]b4_location_initial_column[;
+          line = add_ (line, count, ]b4_location_initial_line[);
+        }
+    }
+
+    /// (column related) Advance to the COUNT next columns.
+    void columns (counter_type count = 1)
+    {
+      column = add_ (column, count, ]b4_location_initial_column[);
+    }
+    /** \} */
+
+    /// File name to which this position refers.
+    ]b4_percent_define_get([[filename_type]])[* filename;
+    /// Current line number.
+    counter_type line;
+    /// Current column number.
+    counter_type column;
+
+  private:
+    /// Compute max (min, lhs+rhs).
+    static counter_type add_ (counter_type lhs, counter_type rhs, counter_type min)
+    {
+      return lhs + rhs < min ? min : lhs + rhs;
+    }
+  };
+
+  /// Add \a width columns, in place.
+  inline position&
+  operator+= (position& res, position::counter_type width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns.
+  inline position
+  operator+ (position res, position::counter_type width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns, in place.
+  inline position&
+  operator-= (position& res, position::counter_type width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns.
+  inline position
+  operator- (position res, position::counter_type width)
+  {
+    return res -= width;
+  }
+]b4_percent_define_flag_if([[define_location_comparison]], [[
+  /// Compare two position objects.
+  inline bool
+  operator== (const position& pos1, const position& pos2)
+  {
+    return (pos1.line == pos2.line
+            && pos1.column == pos2.column
+            && (pos1.filename == pos2.filename
+                || (pos1.filename && pos2.filename
+                    && *pos1.filename == *pos2.filename)));
+  }
+
+  /// Compare two position objects.
+  inline bool
+  operator!= (const position& pos1, const position& pos2)
+  {
+    return !(pos1 == pos2);
+  }
+]])[
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param pos a reference to the position to redirect
+   */
+  template <typename YYChar>
+  std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
+  {
+    if (pos.filename)
+      ostr << *pos.filename << ':';
+    return ostr << pos.line << '.' << pos.column;
+  }
+
+  /// Two points in a source file.
+  class location
+  {
+  public:
+    /// Type for line and column numbers.
+    typedef position::counter_type counter_type;
+]m4_ifdef([b4_location_constructors], [
+    /// Construct a location from \a b to \a e.
+    location (const position& b, const position& e)
+      : begin (b)
+      , end (e)
+    {}
+
+    /// Construct a 0-width location in \a p.
+    explicit location (const position& p = position ())
+      : begin (p)
+      , end (p)
+    {}
+
+    /// Construct a 0-width location in \a f, \a l, \a c.
+    explicit location (]b4_percent_define_get([[filename_type]])[* f,
+                       counter_type l = ]b4_location_initial_line[,
+                       counter_type c = ]b4_location_initial_column[)
+      : begin (f, l, c)
+      , end (f, l, c)
+    {}
+
+])[
+    /// Initialization.
+    void initialize (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
+                     counter_type l = ]b4_location_initial_line[,
+                     counter_type c = ]b4_location_initial_column[)
+    {
+      begin.initialize (f, l, c);
+      end = begin;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+  public:
+    /// Reset initial location to final location.
+    void step ()
+    {
+      begin = end;
+    }
+
+    /// Extend the current location to the COUNT next columns.
+    void columns (counter_type count = 1)
+    {
+      end += count;
+    }
+
+    /// Extend the current location to the COUNT next lines.
+    void lines (counter_type count = 1)
+    {
+      end.lines (count);
+    }
+    /** \} */
+
+
+  public:
+    /// Beginning of the located region.
+    position begin;
+    /// End of the located region.
+    position end;
+  };
+
+  /// Join two locations, in place.
+  inline location&
+  operator+= (location& res, const location& end)
+  {
+    res.end = end.end;
+    return res;
+  }
+
+  /// Join two locations.
+  inline location
+  operator+ (location res, const location& end)
+  {
+    return res += end;
+  }
+
+  /// Add \a width columns to the end position, in place.
+  inline location&
+  operator+= (location& res, location::counter_type width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns to the end position.
+  inline location
+  operator+ (location res, location::counter_type width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns to the end position, in place.
+  inline location&
+  operator-= (location& res, location::counter_type width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns to the end position.
+  inline location
+  operator- (location res, location::counter_type width)
+  {
+    return res -= width;
+  }
+]b4_percent_define_flag_if([[define_location_comparison]], [[
+  /// Compare two location objects.
+  inline bool
+  operator== (const location& loc1, const location& loc2)
+  {
+    return loc1.begin == loc2.begin && loc1.end == loc2.end;
+  }
+
+  /// Compare two location objects.
+  inline bool
+  operator!= (const location& loc1, const location& loc2)
+  {
+    return !(loc1 == loc2);
+  }
+]])[
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param loc a reference to the location to redirect
+   **
+   ** Avoid duplicate information.
+   */
+  template <typename YYChar>
+  std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
+  {
+    location::counter_type end_col
+      = 0 < loc.end.column ? loc.end.column - 1 : 0;
+    ostr << loc.begin;
+    if (loc.end.filename
+        && (!loc.begin.filename
+            || *loc.begin.filename != *loc.end.filename))
+      ostr << '-' << loc.end.filename << ':' << loc.end.line << '.' << end_col;
+    else if (loc.begin.line < loc.end.line)
+      ostr << '-' << loc.end.line << '.' << end_col;
+    else if (loc.begin.column < end_col)
+      ostr << '-' << end_col;
+    return ostr;
+  }
+]])
+
+
+m4_ifdef([b4_position_file], [[
+]b4_output_begin([b4_dir_prefix], [b4_position_file])[
+]b4_generated_by[
+// Starting with Bison 3.2, this file is useless: the structure it
+// used to define is now defined in "]b4_location_file[".
+//
+// To get rid of this file:
+// 1. add '%require "3.2"' (or newer) to your grammar file
+// 2. remove references to this file from your build system
+// 3. if you used to include it, include "]b4_location_file[" instead.
+
+#include ]b4_location_include[
+]b4_output_end[
+]])
+
+
+m4_ifdef([b4_location_file], [[
+]b4_output_begin([b4_dir_prefix], [b4_location_file])[
+]b4_copyright([Locations for Bison parsers in C++])[
+/**
+ ** \file ]b4_location_path[
+ ** Define the ]b4_namespace_ref[::location class.
+ */
+
+]b4_cpp_guard_open([b4_location_path])[
+
+# include <iostream>
+# include <string>
+
+]b4_null_define[
+
+]b4_namespace_open[
+]b4_location_define[
+]b4_namespace_close[
+]b4_cpp_guard_close([b4_location_path])[
+]b4_output_end[
+]])
+
+
+m4_popdef([b4_copyright_years])

data/skeletons/stack.hh

@@ -0,0 +1,157 @@
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+# b4_stack_file
+# -------------
+# Name of the file containing the stack class, if we want this file.
+b4_defines_if([b4_required_version_if([302], [],
+                                      [m4_define([b4_stack_file], [stack.hh])])])
+
+
+# b4_stack_define
+# ---------------
+m4_define([b4_stack_define],
+[[    /// A stack with random access from its top.
+    template <typename T, typename S = std::vector<T> >
+    class stack
+    {
+    public:
+      // Hide our reversed order.
+      typedef typename S::iterator iterator;
+      typedef typename S::const_iterator const_iterator;
+      typedef typename S::size_type size_type;
+      typedef typename std::ptrdiff_t index_type;
+
+      stack (size_type n = 200)
+        : seq_ (n)
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Non copyable.
+      stack (const stack&) = delete;
+      /// Non copyable.
+      stack& operator= (const stack&) = delete;
+#endif
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      const T&
+      operator[] (index_type i) const
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      T&
+      operator[] (index_type i)
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Steal the contents of \a t.
+      ///
+      /// Close to move-semantics.
+      void
+      push (YY_MOVE_REF (T) t)
+      {
+        seq_.push_back (T ());
+        operator[] (0).move (t);
+      }
+
+      /// Pop elements from the stack.
+      void
+      pop (std::ptrdiff_t n = 1) YY_NOEXCEPT
+      {
+        for (; 0 < n; --n)
+          seq_.pop_back ();
+      }
+
+      /// Pop all elements from the stack.
+      void
+      clear () YY_NOEXCEPT
+      {
+        seq_.clear ();
+      }
+
+      /// Number of elements on the stack.
+      index_type
+      size () const YY_NOEXCEPT
+      {
+        return index_type (seq_.size ());
+      }
+
+      /// Iterator on top of the stack (going downwards).
+      const_iterator
+      begin () const YY_NOEXCEPT
+      {
+        return seq_.begin ();
+      }
+
+      /// Bottom of the stack.
+      const_iterator
+      end () const YY_NOEXCEPT
+      {
+        return seq_.end ();
+      }
+
+      /// Present a slice of the top of a stack.
+      class slice
+      {
+      public:
+        slice (const stack& stack, index_type range)
+          : stack_ (stack)
+          , range_ (range)
+        {}
+
+        const T&
+        operator[] (index_type i) const
+        {
+          return stack_[range_ - i];
+        }
+
+      private:
+        const stack& stack_;
+        index_type range_;
+      };
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Non copyable.
+      stack (const stack&);
+      /// Non copyable.
+      stack& operator= (const stack&);
+#endif
+      /// The wrapped container.
+      S seq_;
+    };
+]])
+
+m4_ifdef([b4_stack_file],
+[b4_output_begin([b4_dir_prefix], [b4_stack_file])[
+]b4_generated_by[
+// Starting with Bison 3.2, this file is useless: the structure it
+// used to define is now defined with the parser itself.
+//
+// To get rid of this file:
+// 1. add '%require "3.2"' (or newer) to your grammar file
+// 2. remove references to this file from your build system.
+]b4_output_end[
+]])

data/skeletons/variant.hh

@@ -0,0 +1,463 @@
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+## --------- ##
+## variant.  ##
+## --------- ##
+
+# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
+# ------------------------------------------------
+# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
+# YYTYPE.
+m4_define([b4_symbol_variant],
+[m4_pushdef([b4_dollar_dollar],
+            [$2.$3< $][3 > (m4_shift3($@))])dnl
+switch ($1)
+    {
+b4_type_foreach([_b4_type_action])[]dnl
+      default:
+        break;
+    }
+m4_popdef([b4_dollar_dollar])dnl
+])
+
+
+# _b4_char_sizeof_counter
+# -----------------------
+# A counter used by _b4_char_sizeof_dummy to create fresh symbols.
+m4_define([_b4_char_sizeof_counter],
+[0])
+
+# _b4_char_sizeof_dummy
+# ---------------------
+# At each call return a new C++ identifier.
+m4_define([_b4_char_sizeof_dummy],
+[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl
+dummy[]_b4_char_sizeof_counter])
+
+
+# b4_char_sizeof(SYMBOL-NUMS)
+# ---------------------------
+# To be mapped on the list of type names to produce:
+#
+#    char dummy1[sizeof (type_name_1)];
+#    char dummy2[sizeof (type_name_2)];
+#
+# for defined type names.
+m4_define([b4_char_sizeof],
+[b4_symbol_if([$1], [has_type],
+[
+m4_map([      b4_symbol_tag_comment], [$@])dnl
+      char _b4_char_sizeof_dummy@{sizeof (b4_symbol([$1], [type]))@};
+])])
+
+
+# b4_variant_includes
+# -------------------
+# The needed includes for variants support.
+m4_define([b4_variant_includes],
+[b4_parse_assert_if([[#include <typeinfo>]])[
+#ifndef YY_ASSERT
+# include <cassert>
+# define YY_ASSERT assert
+#endif
+]])
+
+
+
+## -------------------------- ##
+## Adjustments for variants.  ##
+## -------------------------- ##
+
+
+# b4_value_type_declare
+# ---------------------
+# Define semantic_type.
+m4_define([b4_value_type_declare],
+[[  /// A buffer to store and retrieve objects.
+  ///
+  /// Sort of a variant, but does not keep track of the nature
+  /// of the stored data, since that knowledge is available
+  /// via the current parser state.
+  class semantic_type
+  {
+  public:
+    /// Type of *this.
+    typedef semantic_type self_type;
+
+    /// Empty construction.
+    semantic_type () YY_NOEXCEPT
+      : yybuffer_ ()]b4_parse_assert_if([
+      , yytypeid_ (YY_NULLPTR)])[
+    {}
+
+    /// Construct and fill.
+    template <typename T>
+    semantic_type (YY_RVREF (T) t)]b4_parse_assert_if([
+      : yytypeid_ (&typeid (T))])[
+    {
+      YY_ASSERT (sizeof (T) <= size);
+      new (yyas_<T> ()) T (YY_MOVE (t));
+    }
+
+#if 201103L <= YY_CPLUSPLUS
+    /// Non copyable.
+    semantic_type (const self_type&) = delete;
+    /// Non copyable.
+    self_type& operator= (const self_type&) = delete;
+#endif
+
+    /// Destruction, allowed only if empty.
+    ~semantic_type () YY_NOEXCEPT
+    {]b4_parse_assert_if([
+      YY_ASSERT (!yytypeid_);
+    ])[}
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Instantiate a \a T in here from \a t.
+    template <typename T, typename... U>
+    T&
+    emplace (U&&... u)
+    {]b4_parse_assert_if([
+      YY_ASSERT (!yytypeid_);
+      YY_ASSERT (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);])[
+      return *new (yyas_<T> ()) T (std::forward <U>(u)...);
+    }
+# else
+    /// Instantiate an empty \a T in here.
+    template <typename T>
+    T&
+    emplace ()
+    {]b4_parse_assert_if([
+      YY_ASSERT (!yytypeid_);
+      YY_ASSERT (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);])[
+      return *new (yyas_<T> ()) T ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    template <typename T>
+    T&
+    emplace (const T& t)
+    {]b4_parse_assert_if([
+      YY_ASSERT (!yytypeid_);
+      YY_ASSERT (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);])[
+      return *new (yyas_<T> ()) T (t);
+    }
+# endif
+
+    /// Instantiate an empty \a T in here.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build ()
+    {
+      return emplace<T> ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build (const T& t)
+    {
+      return emplace<T> (t);
+    }
+
+    /// Accessor to a built \a T.
+    template <typename T>
+    T&
+    as () YY_NOEXCEPT
+    {]b4_parse_assert_if([
+      YY_ASSERT (yytypeid_);
+      YY_ASSERT (*yytypeid_ == typeid (T));
+      YY_ASSERT (sizeof (T) <= size);])[
+      return *yyas_<T> ();
+    }
+
+    /// Const accessor to a built \a T (for %printer).
+    template <typename T>
+    const T&
+    as () const YY_NOEXCEPT
+    {]b4_parse_assert_if([
+      YY_ASSERT (yytypeid_);
+      YY_ASSERT (*yytypeid_ == typeid (T));
+      YY_ASSERT (sizeof (T) <= size);])[
+      return *yyas_<T> ();
+    }
+
+    /// Swap the content with \a that, of same type.
+    ///
+    /// Both variants must be built beforehand, because swapping the actual
+    /// data requires reading it (with as()), and this is not possible on
+    /// unconstructed variants: it would require some dynamic testing, which
+    /// should not be the variant's responsibility.
+    /// Swapping between built and (possibly) non-built is done with
+    /// self_type::move ().
+    template <typename T>
+    void
+    swap (self_type& that) YY_NOEXCEPT
+    {]b4_parse_assert_if([
+      YY_ASSERT (yytypeid_);
+      YY_ASSERT (*yytypeid_ == *that.yytypeid_);])[
+      std::swap (as<T> (), that.as<T> ());
+    }
+
+    /// Move the content of \a that to this.
+    ///
+    /// Destroys \a that.
+    template <typename T>
+    void
+    move (self_type& that)
+    {
+# if 201103L <= YY_CPLUSPLUS
+      emplace<T> (std::move (that.as<T> ()));
+# else
+      emplace<T> ();
+      swap<T> (that);
+# endif
+      that.destroy<T> ();
+    }
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Move the content of \a that to this.
+    template <typename T>
+    void
+    move (self_type&& that)
+    {
+      emplace<T> (std::move (that.as<T> ()));
+      that.destroy<T> ();
+    }
+#endif
+
+    /// Copy the content of \a that to this.
+    template <typename T>
+    void
+    copy (const self_type& that)
+    {
+      emplace<T> (that.as<T> ());
+    }
+
+    /// Destroy the stored \a T.
+    template <typename T>
+    void
+    destroy ()
+    {
+      as<T> ().~T ();]b4_parse_assert_if([
+      yytypeid_ = YY_NULLPTR;])[
+    }
+
+  private:
+#if YY_CPLUSPLUS < 201103L
+    /// Non copyable.
+    semantic_type (const self_type&);
+    /// Non copyable.
+    self_type& operator= (const self_type&);
+#endif
+
+    /// Accessor to raw memory as \a T.
+    template <typename T>
+    T*
+    yyas_ () YY_NOEXCEPT
+    {
+      void *yyp = yybuffer_.yyraw;
+      return static_cast<T*> (yyp);
+     }
+
+    /// Const accessor to raw memory as \a T.
+    template <typename T>
+    const T*
+    yyas_ () const YY_NOEXCEPT
+    {
+      const void *yyp = yybuffer_.yyraw;
+      return static_cast<const T*> (yyp);
+     }
+
+    /// An auxiliary type to compute the largest semantic type.
+    union union_type
+    {]b4_type_foreach([b4_char_sizeof])[    };
+
+    /// The size of the largest semantic type.
+    enum { size = sizeof (union_type) };
+
+    /// A buffer to store semantic values.
+    union
+    {
+      /// Strongest alignment constraints.
+      long double yyalign_me;
+      /// A buffer large enough to store any of the semantic values.
+      char yyraw[size];
+    } yybuffer_;]b4_parse_assert_if([
+
+    /// Whether the content is built: if defined, the name of the stored type.
+    const std::type_info *yytypeid_;])[
+  };
+]])
+
+
+# How the semantic value is extracted when using variants.
+
+# b4_symbol_value(VAL, SYMBOL-NUM, [TYPE])
+# ----------------------------------------
+# See README.
+m4_define([b4_symbol_value],
+[m4_ifval([$3],
+          [$1.as< $3 > ()],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [$1.as < b4_symbol([$2], [type]) > ()],
+                                  [$1])],
+                    [$1])])])
+
+# b4_symbol_value_template(VAL, SYMBOL-NUM, [TYPE])
+# -------------------------------------------------
+# Same as b4_symbol_value, but used in a template method.
+m4_define([b4_symbol_value_template],
+[m4_ifval([$3],
+          [$1.template as< $3 > ()],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [$1.template as < b4_symbol([$2], [type]) > ()],
+                                  [$1])],
+                    [$1])])])
+
+
+
+## ------------- ##
+## make_SYMBOL.  ##
+## ------------- ##
+
+
+# _b4_includes_tokens(SYMBOL-NUM...)
+# ----------------------------------
+# Expands to non-empty iff one of the SYMBOL-NUM denotes
+# a token.
+m4_define([_b4_is_token],
+          [b4_symbol_if([$1], [is_token], [1])])
+m4_define([_b4_includes_tokens],
+          [m4_map([_b4_is_token], [$@])])
+
+
+# _b4_token_maker_define(SYMBOL-NUM)
+# ----------------------------------
+# Declare make_SYMBOL for SYMBOL-NUM.  Use at class-level.
+m4_define([_b4_token_maker_define],
+[b4_token_visible_if([$1],
+[#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_[]_b4_symbol([$1], [id]) (b4_join(
+                 b4_symbol_if([$1], [has_type],
+                 [b4_symbol([$1], [type]) v]),
+                 b4_locations_if([location_type l])))
+      {
+        return symbol_type (b4_join([token::b4_symbol([$1], [id])],
+                                    b4_symbol_if([$1], [has_type], [std::move (v)]),
+                                    b4_locations_if([std::move (l)])));
+      }
+#else
+      static
+      symbol_type
+      make_[]_b4_symbol([$1], [id]) (b4_join(
+                 b4_symbol_if([$1], [has_type],
+                 [const b4_symbol([$1], [type])& v]),
+                 b4_locations_if([const location_type& l])))
+      {
+        return symbol_type (b4_join([token::b4_symbol([$1], [id])],
+                                    b4_symbol_if([$1], [has_type], [v]),
+                                    b4_locations_if([l])));
+      }
+#endif
+])])
+
+
+m4_define([_b4_type_clause],
+[b4_symbol_if([$1], [is_token],
+              [b4_symbol_if([$1], [has_id],
+                            [tok == token::b4_symbol([$1], [id])],
+                            [tok == b4_symbol([$1], [user_number])])])])
+
+
+# _b4_token_constructor_define(SYMBOL-NUM...)
+# -------------------------------------------
+# Define a unique make_symbol for all the SYMBOL-NUM (they
+# have the same type).  Use at class-level.
+m4_define([_b4_token_constructor_define],
+[m4_ifval(_b4_includes_tokens($@),
+[[#if 201103L <= YY_CPLUSPLUS
+      symbol_type (]b4_join(
+          [int tok],
+          b4_symbol_if([$1], [has_type],
+                       [b4_symbol([$1], [type]) v]),
+          b4_locations_if([location_type l]))[)
+        : super_type(]b4_join([token_type (tok)],
+                              b4_symbol_if([$1], [has_type], [std::move (v)]),
+                              b4_locations_if([std::move (l)]))[)
+      {
+        YY_ASSERT (]m4_join([ || ], m4_map_sep([_b4_type_clause], [, ], [$@]))[);
+      }
+#else
+      symbol_type (]b4_join(
+          [int tok],
+          b4_symbol_if([$1], [has_type],
+                       [const b4_symbol([$1], [type])& v]),
+          b4_locations_if([const location_type& l]))[)
+        : super_type(]b4_join([token_type (tok)],
+                              b4_symbol_if([$1], [has_type], [v]),
+                              b4_locations_if([l]))[)
+      {
+        YY_ASSERT (]m4_join([ || ], m4_map_sep([_b4_type_clause], [, ], [$@]))[);
+      }
+#endif
+]])])
+
+
+# b4_basic_symbol_constructor_define(SYMBOL-NUM)
+# ----------------------------------------------
+# Generate a constructor for basic_symbol from given type.
+m4_define([b4_basic_symbol_constructor_define],
+[[#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          b4_symbol_if([$1], [has_type], [b4_symbol([$1], [type])&& v]),
+          b4_locations_if([location_type&& l]))[)
+        : Base (t)]b4_symbol_if([$1], [has_type], [
+        , value (std::move (v))])[]b4_locations_if([
+        , location (std::move (l))])[
+      {}
+#else
+      basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          b4_symbol_if([$1], [has_type], [const b4_symbol([$1], [type])& v]),
+          b4_locations_if([const location_type& l]))[)
+        : Base (t)]b4_symbol_if([$1], [has_type], [
+        , value (v)])[]b4_locations_if([
+        , location (l)])[
+      {}
+#endif
+]])
+
+
+# b4_token_constructor_define
+# ---------------------------
+# Define the overloaded versions of make_symbol for all the value types.
+m4_define([b4_token_constructor_define],
+[    // Implementation of make_symbol for each symbol type.
+b4_symbol_foreach([_b4_token_maker_define])])

data/stack.hh

@@ -1,124 +0,0 @@
-# C++ skeleton for Bison
-
-# Copyright (C) 2002-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-m4_pushdef([b4_copyright_years],
-           [2002-2012])
-
-# We do want M4 expansion after # for CPP macros.
-m4_changecom()
-m4_divert_push(0)dnl
-@output(b4_dir_prefix[]stack.hh@)@
-b4_copyright([Stack handling for Bison parsers in C++],
-             [2002-2012])[
-
-/**
- ** \file ]b4_dir_prefix[stack.hh
- ** Define the ]b4_namespace_ref[::stack class.
- */
-
-]b4_cpp_guard_open([b4_dir_prefix[]stack.hh])[
-
-# include <deque>
-
-]b4_namespace_open[
-  template <class T, class S = std::deque<T> >
-  class stack
-  {
-  public:
-    // Hide our reversed order.
-    typedef typename S::reverse_iterator iterator;
-    typedef typename S::const_reverse_iterator const_iterator;
-
-    stack () : seq_ ()
-    {
-    }
-
-    stack (unsigned int n) : seq_ (n)
-    {
-    }
-
-    inline
-    T&
-    operator [] (unsigned int i)
-    {
-      return seq_[i];
-    }
-
-    inline
-    const T&
-    operator [] (unsigned int i) const
-    {
-      return seq_[i];
-    }
-
-    inline
-    void
-    push (const T& t)
-    {
-      seq_.push_front (t);
-    }
-
-    inline
-    void
-    pop (unsigned int n = 1)
-    {
-      for (; n; --n)
-        seq_.pop_front ();
-    }
-
-    inline
-    unsigned int
-    height () const
-    {
-      return seq_.size ();
-    }
-
-    inline const_iterator begin () const { return seq_.rbegin (); }
-    inline const_iterator end () const { return seq_.rend (); }
-
-  private:
-    S seq_;
-  };
-
-  /// Present a slice of the top of a stack.
-  template <class T, class S = stack<T> >
-  class slice
-  {
-  public:
-    slice (const S& stack, unsigned int range)
-      : stack_ (stack)
-      , range_ (range)
-    {
-    }
-
-    inline
-    const T&
-    operator [] (unsigned int i) const
-    {
-      return stack_[range_ - i];
-    }
-
-  private:
-    const S& stack_;
-    unsigned int range_;
-  };
-]b4_namespace_close[
-
-]b4_cpp_guard_close([b4_dir_prefix[]stack.hh])
-m4_divert_pop(0)
-m4_popdef([b4_copyright_years])dnl
-m4_changecom([#])

data/xslt/bison.xsl

@@ -3,7 +3,7 @@
 <!--
     bison.xsl - common templates for Bison XSLT.
 
-    Copyright (C) 2007-2012 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -90,4 +90,16 @@
   <xsl:value-of select="string-length(translate($conflict-data, 's', ''))"/>
 </xsl:template>
 
+<xsl:template name="space">
+  <xsl:param name="repeat">0</xsl:param>
+  <xsl:param name="fill" select="' '"/>
+  <xsl:if test="number($repeat) &gt;= 1">
+    <xsl:call-template name="space">
+      <xsl:with-param name="repeat" select="$repeat - 1"/>
+      <xsl:with-param name="fill" select="$fill"/>
+    </xsl:call-template>
+    <xsl:value-of select="$fill"/>
+  </xsl:if>
+</xsl:template>
+
 </xsl:stylesheet>

data/xslt/xml2dot.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2dot.xsl - transform Bison XML Report into DOT.
 
-    Copyright (C) 2007-2012 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -55,7 +55,11 @@
   <xsl:call-template name="escape">
     <xsl:with-param name="subject" select="$filename"/>
   </xsl:call-template>
-  <xsl:text>"&#10;{&#10;</xsl:text>
+  <xsl:text>"&#10;{
+  node [fontname = courier, shape = box, colorscheme = paired6]
+  edge [fontname = courier]
+
+</xsl:text>
   <xsl:apply-templates select="state"/>
   <xsl:text>}&#10;</xsl:text>
 </xsl:template>
@@ -64,11 +68,87 @@
   <xsl:call-template name="output-node">
     <xsl:with-param name="number" select="@number"/>
     <xsl:with-param name="label">
-      <xsl:value-of select="@number"/>
       <xsl:apply-templates select="itemset/item"/>
     </xsl:with-param>
   </xsl:call-template>
   <xsl:apply-templates select="actions/transitions"/>
+  <xsl:apply-templates select="actions/reductions">
+    <xsl:with-param name="staten">
+      <xsl:value-of select="@number"/>
+    </xsl:with-param>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="actions/reductions">
+  <xsl:param name="staten"/>
+  <xsl:for-each select='reduction'>
+    <!-- These variables are needed because the current context can't be
+         referred to directly in XPath expressions. -->
+    <xsl:variable name="rul">
+      <xsl:value-of select="@rule"/>
+    </xsl:variable>
+    <xsl:variable name="ena">
+      <xsl:value-of select="@enabled"/>
+    </xsl:variable>
+    <!-- The foreach's body is protected by this, so that we are actually
+         going to iterate once per reduction rule, and not per lookahead. -->
+    <xsl:if test='not(preceding-sibling::*[@rule=$rul and @enabled=$ena])'>
+      <xsl:variable name="rule">
+        <xsl:choose>
+          <!-- The acceptation state is referred to as 'accept' in the XML, but
+               just as '0' in the DOT. -->
+          <xsl:when test="@rule='accept'">
+            <xsl:text>0</xsl:text>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="@rule"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:variable>
+
+      <!-- The edge's beginning -->
+      <xsl:call-template name="reduction-edge-start">
+        <xsl:with-param name="state" select="$staten"/>
+        <xsl:with-param name="rule" select="$rule"/>
+        <xsl:with-param name="enabled" select="@enabled"/>
+      </xsl:call-template>
+
+      <!-- The edge's tokens -->
+      <!-- Don't show labels for the default action. In other cases, there will
+           always be at least one token, so 'label="[]"' will not occur. -->
+      <xsl:if test='$rule!=0 and not(../reduction[@enabled=$ena and @rule=$rule and @symbol="$default"])'>
+        <xsl:text>label="[</xsl:text>
+        <xsl:for-each select='../reduction[@enabled=$ena and @rule=$rule]'>
+          <xsl:call-template name="escape">
+            <xsl:with-param name="subject" select="@symbol"/>
+          </xsl:call-template>
+          <xsl:if test="position() != last ()">
+            <xsl:text>, </xsl:text>
+          </xsl:if>
+        </xsl:for-each>
+        <xsl:text>]", </xsl:text>
+      </xsl:if>
+
+      <!-- The edge's end -->
+      <xsl:text>style=solid]&#10;</xsl:text>
+
+      <!-- The diamond representing the reduction -->
+      <xsl:call-template name="reduction-node">
+        <xsl:with-param name="state" select="$staten"/>
+        <xsl:with-param name="rule" select="$rule"/>
+        <xsl:with-param name="color">
+          <xsl:choose>
+            <xsl:when test='@enabled="true"'>
+              <xsl:text>3</xsl:text>
+            </xsl:when>
+            <xsl:otherwise>
+              <xsl:text>5</xsl:text>
+            </xsl:otherwise>
+          </xsl:choose>
+        </xsl:with-param>
+      </xsl:call-template>
+    </xsl:if>
+  </xsl:for-each>
 </xsl:template>
 
 <xsl:template match="actions/transitions">
@@ -76,20 +156,53 @@
 </xsl:template>
 
 <xsl:template match="item">
+  <xsl:param name="prev-rule-number"
+    select="preceding-sibling::item[1]/@rule-number"/>
   <xsl:apply-templates select="key('bison:ruleByNumber', @rule-number)">
     <xsl:with-param name="point" select="@point"/>
+    <xsl:with-param name="num" select="@rule-number"/>
+    <xsl:with-param name="prev-lhs"
+      select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
+   />
   </xsl:apply-templates>
   <xsl:apply-templates select="lookaheads"/>
 </xsl:template>
 
 <xsl:template match="rule">
   <xsl:param name="point"/>
+  <xsl:param name="num"/>
+  <xsl:param name="prev-lhs"/>
   <xsl:text>&#10;</xsl:text>
-  <xsl:value-of select="lhs"/>
-  <xsl:text> -&gt;</xsl:text>
+  <xsl:choose>
+    <xsl:when test="$num &lt; 10">
+      <xsl:text>  </xsl:text>
+    </xsl:when>
+    <xsl:when test="$num &lt; 100">
+      <xsl:text> </xsl:text>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:text></xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:value-of select="$num"/>
+  <xsl:text> </xsl:text>
+  <xsl:choose>
+  <xsl:when test="$prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="lhs"/>
+      <xsl:text>:</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
   <xsl:if test="$point = 0">
     <xsl:text> .</xsl:text>
   </xsl:if>
+
+  <!-- RHS -->
   <xsl:for-each select="rhs/symbol|rhs/empty">
     <xsl:apply-templates select="."/>
     <xsl:if test="$point = position()">
@@ -103,10 +216,12 @@
   <xsl:value-of select="."/>
 </xsl:template>
 
-<xsl:template match="empty"/>
+<xsl:template match="empty">
+  <xsl:text> %empty</xsl:text>
+</xsl:template>
 
 <xsl:template match="lookaheads">
-  <xsl:text>[</xsl:text>
+  <xsl:text>  [</xsl:text>
   <xsl:apply-templates select="symbol"/>
   <xsl:text>]</xsl:text>
 </xsl:template>
@@ -118,26 +233,70 @@
   </xsl:if>
 </xsl:template>
 
+<xsl:template name="reduction-edge-start">
+  <xsl:param name="state"/>
+  <xsl:param name="rule"/>
+  <xsl:param name="enabled"/>
+
+  <xsl:text>  </xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text> -> "</xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text>R</xsl:text>
+  <xsl:value-of select="$rule"/>
+  <xsl:if test='$enabled = "false"'>
+    <xsl:text>d</xsl:text>
+  </xsl:if>
+  <xsl:text>" [</xsl:text>
+</xsl:template>
+
+<xsl:template name="reduction-node">
+  <xsl:param name="state"/>
+  <xsl:param name="rule"/>
+  <xsl:param name="color"/>
+
+  <xsl:text> "</xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text>R</xsl:text>
+  <xsl:value-of select="$rule"/>
+  <xsl:if test="$color = 5">
+    <xsl:text>d</xsl:text>
+  </xsl:if>
+  <xsl:text>" [label="</xsl:text>
+  <xsl:choose>
+  <xsl:when test="$rule = 0">
+    <xsl:text>Acc", fillcolor=1</xsl:text>
+  </xsl:when>
+  <xsl:otherwise>
+    <xsl:text>R</xsl:text>
+    <xsl:value-of select="$rule"/>
+    <xsl:text>", fillcolor=</xsl:text>
+    <xsl:value-of select="$color"/>
+  </xsl:otherwise>
+  </xsl:choose>
+  <xsl:text>, shape=diamond, style=filled]&#10;</xsl:text>
+</xsl:template>
+
 <xsl:template match="transition">
   <xsl:call-template name="output-edge">
     <xsl:with-param name="src" select="../../../@number"/>
     <xsl:with-param name="dst" select="@state"/>
     <xsl:with-param name="style">
       <xsl:choose>
-	<xsl:when test="@symbol = 'error'">
-	  <xsl:text>dotted</xsl:text>
-	</xsl:when>
-	<xsl:when test="@type = 'shift'">
-	  <xsl:text>solid</xsl:text>
-	</xsl:when>
-	<xsl:otherwise>
-	  <xsl:text>dashed</xsl:text>
-	</xsl:otherwise>
+        <xsl:when test="@symbol = 'error'">
+          <xsl:text>dotted</xsl:text>
+        </xsl:when>
+        <xsl:when test="@type = 'shift'">
+          <xsl:text>solid</xsl:text>
+        </xsl:when>
+        <xsl:otherwise>
+          <xsl:text>dashed</xsl:text>
+        </xsl:otherwise>
       </xsl:choose>
     </xsl:with-param>
     <xsl:with-param name="label">
       <xsl:if test="not(@symbol = 'error')">
-	<xsl:value-of select="@symbol"/>
+        <xsl:value-of select="@symbol"/>
       </xsl:if>
     </xsl:with-param>
   </xsl:call-template>
@@ -149,10 +308,13 @@
   <xsl:text>  </xsl:text>
   <xsl:value-of select="$number"/>
   <xsl:text> [label="</xsl:text>
+  <xsl:text>State </xsl:text>
+  <xsl:value-of select="$number"/>
+  <xsl:text>\n</xsl:text>
   <xsl:call-template name="escape">
     <xsl:with-param name="subject" select="$label"/>
   </xsl:call-template>
-  <xsl:text>"]&#10;</xsl:text>
+  <xsl:text>\l"]&#10;</xsl:text>
 </xsl:template>
 
 <xsl:template name="output-edge">
@@ -193,7 +355,7 @@
       </xsl:call-template>
     </xsl:with-param>
     <xsl:with-param name="search" select="'&#10;'"/>
-    <xsl:with-param name="replace" select="'\n'"/>
+    <xsl:with-param name="replace" select="'\l'"/>
   </xsl:call-template>
 </xsl:template>
 
@@ -219,4 +381,21 @@
   </xsl:choose>
 </xsl:template>
 
+<xsl:template name="lpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)" />
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+      <xsl:value-of select="$str"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
 </xsl:stylesheet>

data/xslt/xml2text.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2text.xsl - transform Bison XML Report into plain text.
 
-    Copyright (C) 2007-2012 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -230,7 +230,7 @@
 <xsl:template match="automaton/state">
   <xsl:param name="pad"/>
   <xsl:text>&#10;&#10;</xsl:text>
-  <xsl:text>state </xsl:text>
+  <xsl:text>State </xsl:text>
   <xsl:value-of select="@number"/>
   <xsl:text>&#10;&#10;</xsl:text>
   <xsl:apply-templates select="itemset/item">
@@ -253,9 +253,9 @@
     <xsl:text>&#10;</xsl:text>
     <xsl:apply-templates select="transition[@type = $type]">
       <xsl:with-param name="pad">
-	<xsl:call-template name="max-width-symbol">
-	  <xsl:with-param name="node" select="transition[@type = $type]"/>
-	</xsl:call-template>
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="transition[@type = $type]"/>
+        </xsl:call-template>
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:if>
@@ -266,9 +266,9 @@
     <xsl:text>&#10;</xsl:text>
     <xsl:apply-templates select="error">
       <xsl:with-param name="pad">
-	<xsl:call-template name="max-width-symbol">
-	  <xsl:with-param name="node" select="error"/>
-	</xsl:call-template>
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="error"/>
+        </xsl:call-template>
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:if>
@@ -279,9 +279,9 @@
     <xsl:text>&#10;</xsl:text>
     <xsl:apply-templates select="reduction">
       <xsl:with-param name="pad">
-	<xsl:call-template name="max-width-symbol">
-	  <xsl:with-param name="node" select="reduction"/>
-	</xsl:call-template>
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="reduction"/>
+        </xsl:call-template>
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:if>
@@ -290,7 +290,7 @@
 <xsl:template match="item">
   <xsl:param name="pad"/>
   <xsl:param name="prev-rule-number"
-	     select="preceding-sibling::item[1]/@rule-number"/>
+             select="preceding-sibling::item[1]/@rule-number"/>
   <xsl:apply-templates
     select="key('bison:ruleByNumber', current()/@rule-number)"
   >
@@ -329,14 +329,14 @@
   <xsl:choose>
     <xsl:when test="$itemset != 'true' and $prev-lhs = lhs[text()]">
       <xsl:call-template name="lpad">
-	<xsl:with-param name="str" select="'|'"/>
-	<xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
       </xsl:call-template>
     </xsl:when>
     <xsl:when test="$itemset = 'true' and $prev-lhs = lhs[text()]">
       <xsl:call-template name="lpad">
-	<xsl:with-param name="str" select="'|'"/>
-	<xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
       </xsl:call-template>
     </xsl:when>
     <xsl:otherwise>
@@ -350,12 +350,7 @@
     <xsl:if test="position() = $point + 1">
       <xsl:text> .</xsl:text>
     </xsl:if>
-    <xsl:if test="$itemset = 'true' and name(.) != 'empty'">
-      <xsl:apply-templates select="."/>
-    </xsl:if>
-    <xsl:if test="$itemset != 'true'">
-      <xsl:apply-templates select="."/>
-    </xsl:if>
+    <xsl:apply-templates select="."/>
     <xsl:if test="position() = last() and position() = $point">
       <xsl:text> .</xsl:text>
     </xsl:if>
@@ -373,7 +368,7 @@
 </xsl:template>
 
 <xsl:template match="empty">
-  <xsl:text> /* empty */</xsl:text>
+  <xsl:text> %empty</xsl:text>
 </xsl:template>
 
 <xsl:template match="lookaheads">
@@ -442,7 +437,7 @@
       <xsl:value-of select="@rule"/>
       <xsl:text> (</xsl:text>
       <xsl:value-of
-	  select="key('bison:ruleByNumber', current()/@rule)/lhs[text()]"/>
+          select="key('bison:ruleByNumber', current()/@rule)/lhs[text()]"/>
       <xsl:text>)</xsl:text>
     </xsl:otherwise>
   </xsl:choose>
@@ -479,9 +474,9 @@
   <xsl:variable name="longest">
     <xsl:for-each select="$node">
       <xsl:sort data-type="number" select="string-length(@symbol)"
-		order="descending"/>
+                order="descending"/>
       <xsl:if test="position() = 1">
-	<xsl:value-of select="string-length(@symbol)"/>
+        <xsl:value-of select="string-length(@symbol)"/>
       </xsl:if>
     </xsl:for-each>
   </xsl:variable>
@@ -498,7 +493,7 @@
     </xsl:when>
     <xsl:otherwise>
       <xsl:call-template name="space">
-	<xsl:with-param name="repeat" select="$diff"/>
+        <xsl:with-param name="repeat" select="$diff"/>
       </xsl:call-template>
       <xsl:value-of select="$str"/>
     </xsl:otherwise>
@@ -516,24 +511,12 @@
     <xsl:otherwise>
       <xsl:value-of select="$str"/>
       <xsl:call-template name="space">
-	<xsl:with-param name="repeat" select="$diff"/>
+        <xsl:with-param name="repeat" select="$diff"/>
       </xsl:call-template>
     </xsl:otherwise>
   </xsl:choose>
 </xsl:template>
 
-<xsl:template name="space">
-  <xsl:param name="repeat">0</xsl:param>
-  <xsl:param name="fill" select="' '"/>
-  <xsl:if test="number($repeat) &gt;= 1">
-    <xsl:call-template name="space">
-      <xsl:with-param name="repeat" select="$repeat - 1"/>
-      <xsl:with-param name="fill" select="$fill"/>
-    </xsl:call-template>
-    <xsl:value-of select="$fill"/>
-  </xsl:if>
-</xsl:template>
-
 <xsl:template name="line-wrap">
   <xsl:param name="line-length"/> <!-- required -->
   <xsl:param name="first-line-length" select="$line-length"/>

data/xslt/xml2xhtml.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2html.xsl - transform Bison XML Report into XHTML.
 
-    Copyright (C) 2007-2012 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -31,32 +31,33 @@
 <xsl:import href="bison.xsl"/>
 
 <xsl:output method="xml" encoding="UTF-8"
-	    doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
-	    doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
-	    indent="yes"/>
+            doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
+            doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
+            indent="yes"/>
 
 <xsl:template match="/">
   <html>
     <head>
+      <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
       <title>
-	<xsl:value-of select="bison-xml-report/filename"/>
-	<xsl:text> - GNU Bison XML Automaton Report</xsl:text>
+        <xsl:value-of select="bison-xml-report/filename"/>
+        <xsl:text> - GNU Bison XML Automaton Report</xsl:text>
       </title>
       <style type="text/css"><![CDATA[
       body {
         font-family: "Nimbus Sans L", Arial, sans-serif;
-	font-size: 9pt;
+        font-size: 9pt;
       }
       a:link {
-	color: #1f00ff;
-	text-decoration: none;
+        color: #1f00ff;
+        text-decoration: none;
       }
       a:visited {
-	color: #1f00ff;
-	text-decoration: none;
+        color: #1f00ff;
+        text-decoration: none;
       }
       a:hover {
-	color: red;
+        color: red;
       }
       #menu a {
         text-decoration: underline;
@@ -109,21 +110,21 @@
     <li>
       <a href="#reductions">Reductions</a>
       <ul class="lower-alpha">
-	<li><a href="#nonterminals_useless_in_grammar">Nonterminals useless in grammar</a></li>
-	<li><a href="#terminals_unused_in_grammar">Terminals unused in grammar</a></li>
-	<li><a href="#rules_useless_in_grammar">Rules useless in grammar</a></li>
-	<xsl:if test="grammar/rules/rule[@usefulness='useless-in-parser']">
-	  <li><a href="#rules_useless_in_parser">Rules useless in parser due to conflicts</a></li>
-	</xsl:if>
+        <li><a href="#nonterminals_useless_in_grammar">Nonterminals useless in grammar</a></li>
+        <li><a href="#terminals_unused_in_grammar">Terminals unused in grammar</a></li>
+        <li><a href="#rules_useless_in_grammar">Rules useless in grammar</a></li>
+        <xsl:if test="grammar/rules/rule[@usefulness='useless-in-parser']">
+          <li><a href="#rules_useless_in_parser">Rules useless in parser due to conflicts</a></li>
+        </xsl:if>
       </ul>
     </li>
     <li><a href="#conflicts">Conflicts</a></li>
     <li>
       <a href="#grammar">Grammar</a>
       <ul class="lower-alpha">
-	<li><a href="#grammar">Itemset</a></li>
-	<li><a href="#terminals">Terminal symbols</a></li>
-	<li><a href="#nonterminals">Nonterminal symbols</a></li>
+        <li><a href="#grammar">Itemset</a></li>
+        <li><a href="#terminals">Terminal symbols</a></li>
+        <li><a href="#nonterminals">Nonterminal symbols</a></li>
       </ul>
     </li>
     <li><a href="#automaton">Automaton</a></li>
@@ -154,9 +155,9 @@
   <xsl:if test="nonterminal[@usefulness='useless-in-grammar']">
     <p class="pre">
       <xsl:for-each select="nonterminal[@usefulness='useless-in-grammar']">
-	<xsl:text>   </xsl:text>
-	<xsl:value-of select="@name"/>
-	<xsl:text>&#10;</xsl:text>
+        <xsl:text>   </xsl:text>
+        <xsl:value-of select="@name"/>
+        <xsl:text>&#10;</xsl:text>
       </xsl:for-each>
       <xsl:text>&#10;&#10;</xsl:text>
     </p>
@@ -173,9 +174,9 @@
     <p class="pre">
       <xsl:for-each select="terminal[@usefulness='unused-in-grammar']">
         <xsl:sort select="@symbol-number" data-type="number"/>
-	<xsl:text>   </xsl:text>
-	<xsl:value-of select="@name"/>
-	<xsl:text>&#10;</xsl:text>
+        <xsl:text>   </xsl:text>
+        <xsl:value-of select="@name"/>
+        <xsl:text>&#10;</xsl:text>
       </xsl:for-each>
       <xsl:text>&#10;&#10;</xsl:text>
     </p>
@@ -381,7 +382,7 @@
   <h3>
     <a>
       <xsl:attribute name="name">
-	<xsl:value-of select="concat('state_', @number)"/>
+        <xsl:value-of select="concat('state_', @number)"/>
       </xsl:attribute>
     </a>
     <xsl:text>state </xsl:text>
@@ -410,9 +411,9 @@
     <xsl:text>&#10;</xsl:text>
     <xsl:apply-templates select="transition[@type = $type]">
       <xsl:with-param name="pad">
-	<xsl:call-template name="max-width-symbol">
-	  <xsl:with-param name="node" select="transition[@type = $type]"/>
-	</xsl:call-template>
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="transition[@type = $type]"/>
+        </xsl:call-template>
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:if>
@@ -423,9 +424,9 @@
     <xsl:text>&#10;</xsl:text>
     <xsl:apply-templates select="error">
       <xsl:with-param name="pad">
-	<xsl:call-template name="max-width-symbol">
-	  <xsl:with-param name="node" select="error"/>
-	</xsl:call-template>
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="error"/>
+        </xsl:call-template>
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:if>
@@ -436,9 +437,9 @@
     <xsl:text>&#10;</xsl:text>
     <xsl:apply-templates select="reduction">
       <xsl:with-param name="pad">
-	<xsl:call-template name="max-width-symbol">
-	  <xsl:with-param name="node" select="reduction"/>
-	</xsl:call-template>
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="reduction"/>
+        </xsl:call-template>
       </xsl:with-param>
     </xsl:apply-templates>
   </xsl:if>
@@ -447,7 +448,7 @@
 <xsl:template match="item">
   <xsl:param name="pad"/>
   <xsl:param name="prev-rule-number"
-	     select="preceding-sibling::item[1]/@rule-number"/>
+             select="preceding-sibling::item[1]/@rule-number"/>
   <xsl:apply-templates
     select="key('bison:ruleByNumber', current()/@rule-number)"
   >
@@ -477,7 +478,7 @@
   <xsl:if test="$itemset != 'true'">
     <a>
       <xsl:attribute name="name">
-	<xsl:value-of select="concat('rule_', @number)"/>
+        <xsl:value-of select="concat('rule_', @number)"/>
       </xsl:attribute>
     </a>
   </xsl:if>
@@ -486,19 +487,19 @@
   <xsl:choose>
     <xsl:when test="$itemset = 'true'">
       <a>
-	<xsl:attribute name="href">
-	  <xsl:value-of select="concat('#rule_', @number)"/>
-	</xsl:attribute>
-	<xsl:call-template name="lpad">
-	  <xsl:with-param name="str" select="string(@number)"/>
-	  <xsl:with-param name="pad" select="number($pad)"/>
-	</xsl:call-template>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#rule_', @number)"/>
+        </xsl:attribute>
+        <xsl:call-template name="lpad">
+          <xsl:with-param name="str" select="string(@number)"/>
+          <xsl:with-param name="pad" select="number($pad)"/>
+        </xsl:call-template>
       </a>
     </xsl:when>
     <xsl:otherwise>
       <xsl:call-template name="lpad">
-	<xsl:with-param name="str" select="string(@number)"/>
-	<xsl:with-param name="pad" select="number($pad)"/>
+        <xsl:with-param name="str" select="string(@number)"/>
+        <xsl:with-param name="pad" select="number($pad)"/>
       </xsl:call-template>
     </xsl:otherwise>
   </xsl:choose>
@@ -508,19 +509,19 @@
   <xsl:choose>
     <xsl:when test="$itemset != 'true' and $prev-lhs = lhs[text()]">
       <xsl:call-template name="lpad">
-	<xsl:with-param name="str" select="'|'"/>
-	<xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
       </xsl:call-template>
     </xsl:when>
     <xsl:when test="$itemset = 'true' and $prev-lhs = lhs[text()]">
       <xsl:call-template name="lpad">
-	<xsl:with-param name="str" select="'|'"/>
-	<xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
       </xsl:call-template>
     </xsl:when>
     <xsl:otherwise>
       <span class="i">
-	<xsl:value-of select="lhs"/>
+        <xsl:value-of select="lhs"/>
       </span>
       <xsl:text> &#8594;</xsl:text>
     </xsl:otherwise>
@@ -532,12 +533,7 @@
       <xsl:text> </xsl:text>
       <span class="point">.</span>
     </xsl:if>
-    <xsl:if test="$itemset = 'true' and name(.) != 'empty'">
-      <xsl:apply-templates select="."/>
-    </xsl:if>
-    <xsl:if test="$itemset != 'true'">
-      <xsl:apply-templates select="."/>
-    </xsl:if>
+    <xsl:apply-templates select="."/>
     <xsl:if test="position() = last() and position() = $point">
       <xsl:text> </xsl:text>
       <span class="point">.</span>
@@ -563,7 +559,7 @@
 </xsl:template>
 
 <xsl:template match="empty">
-  <xsl:text> &#949;</xsl:text>
+  <xsl:text> %empty</xsl:text>
 </xsl:template>
 
 <xsl:template match="lookaheads">
@@ -589,18 +585,18 @@
   <xsl:choose>
     <xsl:when test="@type = 'shift'">
       <a>
-	<xsl:attribute name="href">
-	  <xsl:value-of select="concat('#state_', @state)"/>
-	</xsl:attribute>
-	<xsl:value-of select="concat('shift, and go to state ', @state)"/>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#state_', @state)"/>
+        </xsl:attribute>
+        <xsl:value-of select="concat('shift, and go to state ', @state)"/>
       </a>
     </xsl:when>
     <xsl:when test="@type = 'goto'">
       <a>
-	<xsl:attribute name="href">
-	  <xsl:value-of select="concat('#state_', @state)"/>
-	</xsl:attribute>
-	<xsl:value-of select="concat('go to state ', @state)"/>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#state_', @state)"/>
+        </xsl:attribute>
+        <xsl:value-of select="concat('go to state ', @state)"/>
       </a>
     </xsl:when>
   </xsl:choose>
@@ -637,10 +633,10 @@
     </xsl:when>
     <xsl:otherwise>
       <a>
-	<xsl:attribute name="href">
-	  <xsl:value-of select="concat('#rule_', @rule)"/>
-	</xsl:attribute>
-	<xsl:value-of select="concat('reduce using rule ', @rule)"/>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#rule_', @rule)"/>
+        </xsl:attribute>
+        <xsl:value-of select="concat('reduce using rule ', @rule)"/>
       </a>
       <xsl:text> (</xsl:text>
       <xsl:value-of
@@ -687,9 +683,9 @@
   <xsl:variable name="longest">
     <xsl:for-each select="$node">
       <xsl:sort data-type="number" select="string-length(@symbol)"
-		order="descending"/>
+                order="descending"/>
       <xsl:if test="position() = 1">
-	<xsl:value-of select="string-length(@symbol)"/>
+        <xsl:value-of select="string-length(@symbol)"/>
       </xsl:if>
     </xsl:for-each>
   </xsl:variable>
@@ -706,7 +702,7 @@
     </xsl:when>
     <xsl:otherwise>
       <xsl:call-template name="space">
-	<xsl:with-param name="repeat" select="$diff"/>
+        <xsl:with-param name="repeat" select="$diff"/>
       </xsl:call-template>
       <xsl:value-of select="$str"/>
     </xsl:otherwise>
@@ -724,7 +720,7 @@
     <xsl:otherwise>
       <xsl:value-of select="$str"/>
       <xsl:call-template name="space">
-	<xsl:with-param name="repeat" select="$diff"/>
+        <xsl:with-param name="repeat" select="$diff"/>
       </xsl:call-template>
     </xsl:otherwise>
   </xsl:choose>

djgpp/Makefile.maint

@@ -1,37 +0,0 @@
-# DJGPP Maintainer's Makefile                                    -*-Makefile-*-
-# Requires GNU sed
-
-## Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-top_srcdir = ..
-srcdir = .
-
-SHELL = /bin/sh
-
-all: README
-
-README: README.in $(top_srcdir)/configure
-	PACKAGE=`grep "^[	 ]*PACKAGE=" $(top_srcdir)/configure | sed -e 's/^[	 ]*PACKAGE=//' -e s/[\"\']//g`; \
-	VERSION=`grep "^[	 ]*VERSION=" $(top_srcdir)/configure | sed -e 's/^[	 ]*VERSION=//' -e s/[\"\']//g`; \
-	package_version=`echo "$${VERSION}" | sed 's/\.//g'`; \
-	tree_version=`echo "$${VERSION}" | sed 's/\.//2g'`; \
-	sed \
-	    -e "s/@V@/$${PACKAGE}-$${VERSION}/g" \
-	    -e "s/@VERSION@/$${VERSION}/g" \
-	    -e "s/@PACKAGE_VERSION@/$$package_version/g" \
-	    -e "s/@TREE_VERSION@/$$tree_version/g" \
-	  $(srcdir)/README.in > t-$@
-	mv t-$@ $@

djgpp/README.in

@@ -1,195 +0,0 @@
-This is a port of GNU Bison @VERSION@ to MSDOS/DJGPP.
-
-Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-1.:     DJGPP specific changes.
-	=======================
-
-	The DJGPP port of Bison offers LFN and SFN support depending on which
-	OS it is running. If LFN support is available or not is determinated at
-	run time.  If LFN support is available (DOS session under Win9X, Win2K,
-	WinXP, etc.) the standard posix file name extensions will be used.
-	These are: y.tab.c, y.tab.c++, y.tab.h, y.output, etc.  If only SFN
-	support is available (plain DOS), then the standard MSDOS short file
-	names will be used. These are: y_tab.c, y_tab.h, y.out, etc.
-	It should be noticed that this bison version needs the m4 program as
-	back end to generate the parser file (y.tab.c etc.) from the skeleton
-	files.  This implies that m4 must always be installed to get bison
-	working.  m4 will use a couple of m4 scripts that will be installed in
-	/dev/env/DJDIR/share/bison and shall not be removed.
-	It should also be noticed that the skeleton files bison.simple and
-	bison.hairy are no longer supported.  This applies also to the environ-
-	ment variables BISON_HAIRY and BISON_SIMPLE.  Those variables are *no*
-	longer honored at all.
-	The kind of skeleton file bison.hairy is no longer supported at all.
-	The skeleton file bison.simple is now called yacc.c and is an m4 script.
-	The other two skeleton files supported by this bison version are glr.c
-	and lalr1.cc.  The first one is a generalized LR C parser based on
-	Bison's LALR(1) tables and the second one is a experimental C++ parser
-	class.
-	As has been told before, bison uses m4 to generate the parser file.
-	This is done by forking and using pipes for the IPC.  MSDOS does not
-	support this functionality so this has been reproduced in the usual
-	way by redirecting stdin and stdout of bison and m4 to temporary files
-	and processing these files in sequence.
-	It should be noticed that due to the great amount of file names that do
-	not cleanly map to 8.3 file names, you will need an OS with LFN support
-	to configure and compile the sources. On Win98 this implies that the
-	generation of numeric tails for 8.3 file name aliases must be enabled
-	or the compilation will fail.
-
-
-	Please **read** the docs.
-
-
-2.:     Installing the binary package.
-	==============================
-
-2.1.:   Copy the binary distribution into the top DJGPP installation directory,
-	just unzip it preserving the directory structure running *ONE* of the
-	following commands:
-	  unzip32 bsn@[email protected]      or
-	  djtarx bsn@[email protected]       or
-	  pkunzip -d bsn@[email protected]
-
-
-
-3.:     Building the binaries from sources.
-	===================================
-
-3.1.:   Create a temporary directory and copy the source package into the
-	directory.  If you download the source distribution from one of the
-	DJGPP sites, just unzip it preserving the directory structure
-	running *ONE* of the following commands:
-	  unzip32 bsn@[email protected]      or
-	  djtarx bsn@[email protected]       or
-	  pkunzip -d bsn@[email protected]
-	and proceed to the paragraph 3.3, below.
-
-3.2.:   Source distributions downloaded from one of the GNU FTP sites need
-	some more work to unpack, if LFN support is not available.  If LFN is
-	available then you can extract the source files from the archive with
-	any unzip program and proceed to the paragraph 3.3, below.  Any file
-	name issue will be handled by the DJGPP configuration files.
-	To unpack the source distribution on SFN systems, first, you MUST use
-	the `djunpack' batch file to unzip the package.  That is because some
-	file names in the official distributions need to be changed to avoid
-	problems on the various platforms supported by DJGPP.
-	`djunpack' invokes the `djtar' program (that is part of the basic DJGPP
-	development kit) to rename these files on the fly given a file with
-	name mappings; the distribution includes a file `djgpp/fnchange.lst'
-	with the necessary mappings.  So you need first to retrieve that batch
-	file, and then invoke it to unpack the distribution.  Here's how:
-
-	  djtar -x -p -o bison-@VERSION@/djgpp/djunpack.bat bison-@[email protected] > djunpack.bat
-	  djunpack bison-@[email protected]
-
-	(The name of the distribution archive and the leading directory of the
-	path to `djunpack.bat' in the distribution will be different for
-	versions of Bison other than @VERSION@.)
-
-	If the argument to `djunpack.bat' include leading directories, it MUST
-	be given with the DOS-style backslashes; Unix-style forward slashes
-	will NOT work.
-
-	If the distribution comes as a .tar.bz2 archive, and your version of
-	`djtar' doesn't support bzip2 decompression, you need to unpack it as
-	follows:
-
-	  bnzip2 bison-@[email protected]
-	  djtar -x -p -o bison-@VERSION@/djgpp/djunpack.bat bison-@[email protected] > djunpack.bat
-	  djunpack bison-@[email protected]
-
-3.3.:   To build the binaries you will need the following binary packages:
-	  djdev203.zip (or a later but NOT a prior version)
-	  bsh204b.zip  (or a later but NOT a prior version)
-          gccNNNb.zip, gppNNN.zip, bnuNNNb.zip, makNNNb.zip, filNNNb.zip,
-          perlNNNb.zip, shlNNNb.zip, txtNNNb.zip, txiNNNb.zip, grepNNNb.zip,
-          sedNNNb.zip and m4NNN.zip
-
-	If you want to run the check you will need also:
-	  difNNNb.zip
-
-	NNN represents the latest version number of the binary packages. All
-	this packages can be found in the /v2gnu directory of any
-	ftp.delorie.com mirror.
-	You will need bsh204b.zip or later and *NOT* a prior version or
-	the build will fail.  The same applies to djdev203.zip.  Please note
-	that Bison requires m4-144b.zip or later to work properly.
-
-3.4.:   If for some reason you want to reconfigure the package cd into the top
-	srcdir (bison-@TREE_VERSION@) and run the following commands:
-	  del djgpp\config.cache
-	  make clean
-	  djgpp\config
-
-	Please note that you *MUST* delete the config.cache file in the djgpp
-	subdir or you will not really reconfigure the sources because the
-	configuration informations will be read from the cache file instead
-	of being newly computed.
-	To build the programs in a directory other than where the sources are,
-	you must add the parameter that specifies the source directory,
-	e.g:
-	  x:\src\gnu\bison-@TREE_VERSION@\djgpp\config x:/src/gnu/bison-@TREE_VERSION@
-
-	Lets assume you want to build the binaries in a directory placed on a
-	different drive (z:\build in this case) from where the sources are,
-	then you will run the following commands:
-	  z:
-	  md \build
-	  cd \build
-	  x:\src\gnu\bison-@TREE_VERSION@\djgpp\config x:/src/gnu/bison-@TREE_VERSION@
-
-	The order of the options and the srcdir option does not matter.  You
-	*MUST* use forward slashes to specify the source directory.
-
-	The batch file will set same environment variables, make MSDOS specific
-	modifications to the Makefile.in's and supply all other needed options
-	to the configure script.
-
-3.5.:   To compile the package run from the top srcdir the command:
-	  make
-
-3.6.:   Now you can run the tests if you like.  From the top srcdir run the
-	command:
-	  make check
-
-	No test should fail but the tests #131 (Doxygen Public Documentation)
-	and #132 (Doxygen Private Documentation) will be skipped.  Please note
-	that the testsuite only works with LFN available.  On plain DOS, most
-	of the tests will fail due to invalid DOS names.
-
-3.7.:   To install the binaries, header, library, catalogs, and info docs
-	run the following command from the top srcdir:
-	  make install
-
-	This will install the products into your DJGPP installation tree given
-	by the default prefix "/dev/env/DJDIR".  If you prefer to install them
-	into some other directory you will have to set prefix to the appropriate
-	value:
-	  make install prefix=z:/some/other/place
-
-
-
-	Send GNU bison specific bug reports to <[email protected]>.
-	Send suggestions and bug reports concerning the DJGPP port to
-	comp.os.msdos.djgpp or <[email protected]>.
-
-
-Enjoy.
-
-	Guerrero, Juan Manuel <[email protected]>

djgpp/config.bat

@@ -1,547 +0,0 @@
-@echo off
-Rem Configure Bison for DJGPP.
-
-Rem WARNING WARNING WARNING: This file needs to have DOS CRLF end-of-line
-Rem format, or else stock DOS/Windows shells will refuse to run it.
-
-Rem Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-Rem This program is free software: you can redistribute it and/or modify
-Rem it under the terms of the GNU General Public License as published by
-Rem the Free Software Foundation, either version 3 of the License, or
-Rem (at your option) any later version.
-Rem
-Rem This program is distributed in the hope that it will be useful,
-Rem but WITHOUT ANY WARRANTY; without even the implied warranty of
-Rem MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-Rem GNU General Public License for more details.
-Rem
-Rem You should have received a copy of the GNU General Public License
-Rem along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-echo Configuring Bison for DJGPP v2.x...
-
-Rem The SmallEnv tests protect against fixed and too small size
-Rem of the environment in stock DOS shell.
-
-Rem Find out if NLS is wanted or not,
-Rem if dependency-tracking is wanted or not,
-Rem if caching is wanted or not
-Rem and where the sources are.
-Rem We always default to NLS support,
-Rem no dependency tracking
-Rem and to in place configuration.
-set ARGS=
-set NLS=enabled
-if not "%NLS%" == "enabled" goto SmallEnv
-set CACHING=enabled
-if not "%CACHING%" == "enabled" goto SmallEnv
-set DEPENDENCY_TRACKING=disabled
-if not "%DEPENDENCY_TRACKING%" == "disabled" goto SmallEnv
-set LIBICONV_PREFIX=disabled
-if not "%LIBICONV_PREFIX%" == "disabled" goto SmallEnv
-set LIBINTL_PREFIX=disabled
-if not "%LIBINTL_PREFIX%" == "disabled" goto SmallEnv
-set HTML=enabled
-if not "%HTML%" == "enabled" goto SmallEnv
-set XSRC=.
-if not "%XSRC%" == "." goto SmallEnv
-
-Rem Loop over all arguments.
-Rem Special arguments are: NLS, XSRC, CACHE, STATIC_LIBS, LIBICONV_PREFIX, LIBINTL_PREFIX and DEPS.
-Rem All other arguments are stored into ARGS.
-:ArgLoop
-if "%1" == "nls" goto NextArgument
-if "%1" == "NLS" goto NextArgument
-if "%1" == "no-nls" goto NoNLS
-if "%1" == "no-NLS" goto NoNLS
-if "%1" == "NO-NLS" goto NoNLS
-goto CachingOption
-:NoNLS
-if "%1" == "no-nls" set NLS=disabled
-if "%1" == "no-NLS" set NLS=disabled
-if "%1" == "NO-NLS" set NLS=disabled
-if not "%NLS%" == "disabled" goto SmallEnv
-goto NextArgument
-:CachingOption
-if "%1" == "cache" goto NextArgument
-if "%1" == "CACHE" goto NextArgument
-if "%1" == "no-cache" goto NoCaching
-if "%1" == "no-CACHE" goto NoCaching
-if "%1" == "NO-CACHE" goto NoCaching
-goto DependencyOption
-:NoCaching
-if "%1" == "no-cache" set CACHING=disabled
-if "%1" == "no-CACHE" set CACHING=disabled
-if "%1" == "NO-CACHE" set CACHING=disabled
-if not "%CACHING%" == "disabled" goto SmallEnv
-goto NextArgument
-:DependencyOption
-if "%1" == "no-dep" goto NextArgument
-if "%1" == "no-DEP" goto NextArgument
-if "%1" == "NO-DEP" goto NextArgument
-if "%1" == "dep" goto DependecyTraking
-if "%1" == "DEP" goto DependecyTraking
-goto LibiconvPrefixOption
-:DependecyTraking
-if "%1" == "dep" set DEPENDENCY_TRACKING=enabled
-if "%1" == "DEP" set DEPENDENCY_TRACKING=enabled
-if not "%DEPENDENCY_TRACKING%" == "enabled" goto SmallEnv
-goto NextArgument
-:LibiconvPrefixOption
-if "%1" == "no-libiconvprefix" goto NextArgument
-if "%1" == "no-LIBICONVPREFIX" goto NextArgument
-if "%1" == "NO-LIBICONVPREFIX" goto NextArgument
-if "%1" == "libiconvprefix" goto WithLibiconvPrefix
-if "%1" == "LIBICONVPREFIX" goto WithLibiconvPrefix
-goto LibintlPrefixOption
-:WithLibiconvPrefix
-if "%1" == "libiconvprefix" set LIBICONV_PREFIX=enabled
-if "%1" == "LIBICONVPREFIX" set LIBICONV_PREFIX=enabled
-if not "%LIBICONV_PREFIX%" == "enabled" goto SmallEnv
-goto NextArgument
-:LibintlPrefixOption
-if "%1" == "no-libiconvprefix" goto NextArgument
-if "%1" == "no-LIBICONVPREFIX" goto NextArgument
-if "%1" == "NO-LIBICONVPREFIX" goto NextArgument
-if "%1" == "libintlprefix" goto _WithLibintlPrefix
-if "%1" == "LIBINTLPREFIX" goto _WithLibintlPrefix
-goto HTMLOption
-:_WithLibintlPrefix
-if "%1" == "libintlprefix" set LIBINTL_PREFIX=enabled
-if "%1" == "LIBINTLPREFIX" set LIBINTL_PREFIX=enabled
-if not "%LIBINTL_PREFIX%" == "enabled" goto SmallEnv
-:HTMLOption
-if "%1" == "withhtml" goto NextArgument
-if "%1" == "withHTML" goto NextArgument
-if "%1" == "WITHHTML" goto NextArgument
-if "%1" == "withouthtml" goto _WithoutHTML
-if "%1" == "withoutHTML" goto _WithoutHTML
-if "%1" == "WITHOUTHTML" goto _WithoutHTML
-goto SrcDirOption
-:_WithoutHTML
-if "%1" == "withouthtml" set HTML=disabled
-if "%1" == "withoutHTML" set HTML=disabled
-if "%1" == "WITHOUTHTML" set HTML=disabled
-if not "%HTML%" == "disabled" goto SmallEnv
-goto NextArgument
-:SrcDirOption
-echo %1 | grep -q "/"
-if errorlevel 1 goto CollectArgument
-set XSRC=%1
-if not "%XSRC%" == "%1" goto SmallEnv
-goto NextArgument
-:CollectArgument
-set _ARGS=%ARGS% %1
-if not "%_ARGS%" == "%ARGS% %1" if not "%_ARGS%" == "%ARGS%%1" goto SmallEnv
-echo %_ARGS% | grep -q "[^ ]"
-if not errorlevel 0 set ARGS=%_ARGS%
-set _ARGS=
-:NextArgument
-shift
-if not "%1" == "" goto ArgLoop
-
-Rem Create an arguments file for the configure script.
-echo --srcdir=%XSRC% > args
-if "%CACHING%" == "enabled"              echo --cache-file=%XSRC%/djgpp/config.cache >> args
-if "%DEPENDENCY_TRACKING%" == "enabled"  echo --enable-dependency-tracking >> args
-if "%DEPENDENCY_TRACKING%" == "disabled" echo --disable-dependency-tracking >> args
-if "%LIBICONV_PREFIX%" == "enabled"      echo --with-libiconv-prefix >> args
-if "%LIBICONV_PREFIX%" == "disabled"     echo --without-libiconv-prefix >> args
-if "%LIBINTL_PREFIX%" == "enabled"       echo --with-libintl-prefix >> args
-if "%LIBINTL_PREFIX%" == "disabled"      echo --without-libintl-prefix >> args
-if "%HTML%" == "enabled"                 echo --enable-html >> args
-if "%HTML%" == "disabled"                echo --disable-html >> args
-if not "%ARGS%" == ""                    echo %ARGS% >> args
-set ARGS=
-set CACHING=
-set DEPENDENCY_TRACKING=
-set LIBICONV_PREFIX=
-set LIBINTL_PREFIX=
-set HTML=
-
-if "%XSRC%" == "." goto InPlace
-
-:NotInPlace
-redir -e /dev/null update %XSRC%/configure.org ./configure
-test -f ./configure
-if errorlevel 1 update %XSRC%/configure ./configure
-
-:InPlace
-Rem Update configuration files
-echo Updating configuration scripts...
-test -f ./configure.org
-if errorlevel 1 update configure configure.org
-sed -f %XSRC%/djgpp/config.sed configure.org > configure
-if errorlevel 1 goto SedError
-
-Rem Make sure they have a config.site file
-set CONFIG_SITE=%XSRC%/djgpp/config.site
-if not "%CONFIG_SITE%" == "%XSRC%/djgpp/config.site" goto SmallEnv
-
-Rem inttypes_.h and inttypes.h map to the same 8.3 alias.
-test -f %XSRC%/lib/inttypes_.h
-if not errorlevel 1 mv -f %XSRC%/lib/inttypes_.h %XSRC%/lib/_inttypes.h
-
-Rem Make sure crucial file names are not munged by unpacking
-test -f %XSRC%/po/Makefile.in.in
-if not errorlevel 1 mv -f %XSRC%/po/Makefile.in.in %XSRC%/po/Makefile.in-in
-test -f %XSRC%/po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/po/Makefile.in %XSRC%/po/Makefile.in-in
-test -f %XSRC%/po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/po/Makefile.inin %XSRC%/po/Makefile.in-in
-test -f %XSRC%/po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/po/Makefile.in_in %XSRC%/po/Makefile.in-in
-test -f %XSRC%/po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/po/Makefile_in.in %XSRC%/po/Makefile.in-in
-test -f %XSRC%/runtime-po/Makefile.in.in
-if not errorlevel 1 mv -f %XSRC%/runtime-po/Makefile.in.in %XSRC%/runtime-po/Makefile.in-in
-test -f %XSRC%/runtime-po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/runtime-po/Makefile.in %XSRC%/runtime-po/Makefile.in-in
-test -f %XSRC%/runtime-po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/runtime-po/Makefile.inin %XSRC%/runtime-po/Makefile.in-in
-test -f %XSRC%/runtime-po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/runtime-po/Makefile.in_in %XSRC%/runtime-po/Makefile.in-in
-test -f %XSRC%/runtime-po/Makefile.in-in
-if errorlevel 1 mv -f %XSRC%/runtime-po/Makefile_in.in %XSRC%/runtime-po/Makefile.in-in
-test -f %XSRC%/data/c++.m4
-if not errorlevel 1 mv -f %XSRC%/data/c++.m4 %XSRC%/data/cxx.m4
-test -f %XSRC%/data/cxx.m4
-if errorlevel 1 mv -f %XSRC%/data/cpp.m4 %XSRC%/data/cxx.m4
-test -f %XSRC%/data/c++-skel.m4
-if not errorlevel 1 mv -f %XSRC%/data/c++-skel.m4 %XSRC%/data/cxx-skel.m4
-test -f %XSRC%/data/cxx-skel.m4
-if errorlevel 1 mv -f %XSRC%/data/cpp-skel.m4 %XSRC%/data/cxx-skel.m4
-test -f %XSRC%/build-aux/javacomp.sh.in
-if not errorlevel 1 mv -f %XSRC%/build-aux/javacomp.sh.in %XSRC%/build-aux/javacomp.sh-in
-test -f %XSRC%/build-aux/javacomp.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javacomp.sh %XSRC%/build-aux/javacomp.sh-in
-test -f %XSRC%/build-aux/javacomp.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javacomp.shin %XSRC%/build-aux/javacomp.sh-in
-test -f %XSRC%/build-aux/javacomp.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javacomp.sh_in %XSRC%/build-aux/javacomp.sh-in
-test -f %XSRC%/build-aux/javacomp.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javacomp.sh.in %XSRC%/build-aux/javacomp.sh-in
-test -f %XSRC%/build-aux/javaexec.sh.in
-if not errorlevel 1 mv -f %XSRC%/build-aux/javaexec.sh.in %XSRC%/build-aux/javaexec.sh-in
-test -f %XSRC%/build-aux/javaexec.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javaexec.sh %XSRC%/build-aux/javaexec.sh-in
-test -f %XSRC%/build-aux/javaexec.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javaexec.shin %XSRC%/build-aux/javaexec.sh-in
-test -f %XSRC%/build-aux/javaexec.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javaexec.sh_in %XSRC%/build-aux/javaexec.sh-in
-test -f %XSRC%/build-aux/javaexec.sh-in
-if errorlevel 1 mv -f %XSRC%/build-aux/javaexec_sh.in %XSRC%/build-aux/javaexec.sh-in
-test -f %XSRC%/doc/yacc.1.in
-if not errorlevel 1 mv -f %XSRC%/doc/yacc.1.in %XSRC%/doc/yacc.1-in
-test -f %XSRC%/doc/yacc.1-in
-if errorlevel 1 mv -f %XSRC%/doc/yacc.1 %XSRC%/doc/yacc.1-in
-test -f %XSRC%/doc/yacc.1-in
-if errorlevel 1 mv -f %XSRC%/doc/yacc.1in %XSRC%/doc/yacc.1-in
-test -f %XSRC%/doc/yacc.1-in
-if errorlevel 1 mv -f %XSRC%/doc/yacc.1_in %XSRC%/doc/yacc.1-in
-test -f %XSRC%/doc/yacc.1-in
-if errorlevel 1 mv -f %XSRC%/doc/yacc_1.in %XSRC%/doc/yacc.1-in
-test -f %XSRC%/etc/bench.pl.in
-if not errorlevel 1 mv -f %XSRC%/etc/bench.pl.in %XSRC%/etc/bench.pl-in
-test -f %XSRC%/etc/bench.pl-in
-if errorlevel 1 mv -f %XSRC%/etc/bench.pl %XSRC%/etc/bench.pl-in
-test -f %XSRC%/etc/bench.pl-in
-if errorlevel 1 mv -f %XSRC%/etc/bench.plin %XSRC%/etc/bench.pl-in
-test -f %XSRC%/etc/bench.pl-in
-if errorlevel 1 mv -f %XSRC%/etc/bench.pl_in %XSRC%/etc/bench.pl-in
-test -f %XSRC%/etc/bench.pl-in
-if errorlevel 1 mv -f %XSRC%/etc/bench_pl.in %XSRC%/etc/bench.pl-in
-
-:scan_gram_c_Test
-test -f %XSRC%/src/c-scan-gram.c
-if not errorlevel 1 goto scan_skel_c_Test
-test -f %XSRC%/src/scan-gram-c.c
-if not errorlevel 1 mv -f %XSRC%/src/scan-gram-c.c %XSRC%/src/c-scan-gram.c
-:scan_skel_c_Test
-test -f %XSRC%/src/c-scan-skel.c
-if not errorlevel 1 goto FixFiles
-test -f %XSRC%/src/scan-skel-c.c
-if not errorlevel 1 mv -f %XSRC%/src/scan-skel-c.c %XSRC%/src/c-scan-skel.c
-
-:FixFiles
-Rem Fix data/lalr1.cc and data/location.cc to reflect the renaming of c++.m4
-sed "s/c++\.m4/cxx.m4/" %XSRC%/data/lalr1.cc > lalr1.cc
-if errorlevel 1 goto lalr1_ccFileError
-mv ./lalr1.cc %XSRC%/data/lalr1.cc
-sed "s/c++\.m4/cxx.m4/" %XSRC%/data/location.cc > location.cc
-if errorlevel 1 goto location_ccFileError
-mv ./location.cc %XSRC%/data/location.cc
-sed "s/c++\.m4/cxx.m4/" %XSRC%/data/glr.cc > glr.cc
-if errorlevel 1 goto glr_ccFileError
-mv ./glr.cc %XSRC%/data/glr.cc
-
-Rem Fix src/getargs.c to reflect the renaming of c++-skel.m4
-sed "s/c++-skel\.m4/cxx-skel.m4/" %XSRC%/src/getargs.c > getargs.c
-if errorlevel 1 goto getargs_cFileError
-mv ./getargs.c %XSRC%/src/getargs.c
-
-Rem Define DJGPP specific defs in config.hin
-echo Editing config.hin...
-test -f %XSRC%/lib/config_h.org
-if errorlevel 1 update %XSRC%/lib/config.hin %XSRC%/lib/config_h.org
-sed -f %XSRC%/djgpp/config_h.sed %XSRC%/lib/config_h.org > config.hin
-if errorlevel 1 goto SedError2
-mv -f config.hin %XSRC%/lib/config.hin
-
-
-Rem Fixing ilicit testsuite file name.
-test -f %XSRC%/tests/c++.at
-if not errorlevel 1 mv -f %XSRC%/tests/c++.at %XSRC%/tests/cxx.at
-
-test -f %XSRC%/tests/testsuite.org
-if errorlevel 1 update %XSRC%/tests/testsuite %XSRC%/tests/testsuite.org
-sed -f %XSRC%/djgpp/testsuite.sed %XSRC%/tests/testsuite.org > testsuite.tmp
-if errorlevel 1 goto SedError3
-mv -f ./testsuite.tmp %XSRC%/tests/testsuite
-
-Rem Fixing ilicit calc++ file names in the calc++ directory.
-test -d %XSRC%/examples/calc++
-if not errorlevel 1 mv -f %XSRC%/examples/calc++ %XSRC%/examples/calcxx
-test -d %XSRC%/examples/calcxx
-if errorlevel 1 mv -f %XSRC%/examples/calcpp %XSRC%/examples/calcxx
-test -f %XSRC%/examples/calcxx/calc++-scanner.cc
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-scanner.cc %XSRC%/examples/calcxx/calcxx-scanner.cc
-test -f %XSRC%/examples/calcxx/calcxx-scanner.cc
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-scanner.cc %XSRC%/examples/calcxx/calcxx-scanner.cc
-test -f %XSRC%/examples/calcxx/calc++-scanner.ll
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-scanner.ll %XSRC%/examples/calcxx/calcxx-scanner.ll
-test -f %XSRC%/examples/calcxx/calcxx-scanner.ll
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-scanner.ll %XSRC%/examples/calcxx/calcxx-scanner.ll
-test -f %XSRC%/examples/calcxx/calc++-driver.cc
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-driver.cc %XSRC%/examples/calcxx/calcxx-driver.cc
-test -f %XSRC%/examples/calcxx/calcxx-driver.cc
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-driver.cc %XSRC%/examples/calcxx/calcxx-driver.cc
-test -f %XSRC%/examples/calcxx/calc++-driver.hh
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-driver.hh %XSRC%/examples/calcxx/calcxx-driver.hh
-test -f %XSRC%/examples/calcxx/calcxx-driver.hh
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-driver.hh %XSRC%/examples/calcxx/calcxx-driver.hh
-test -f %XSRC%/examples/calcxx/calc++-parser.cc
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-parser.cc %XSRC%/examples/calcxx/calcxx-parser.cc
-test -f %XSRC%/examples/calcxx/calcxx-parser.cc
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-parser.cc %XSRC%/examples/calcxx/calcxx-parser.cc
-test -f %XSRC%/examples/calcxx/calc++-parser.hh
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-parser.hh %XSRC%/examples/calcxx/calcxx-parser.hh
-test -f %XSRC%/examples/calcxx/calcxx-parser.hh
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-parser.hh %XSRC%/examples/calcxx/calcxx-parser.hh
-test -f %XSRC%/examples/calcxx/calc++-parser.stamp
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-parser.stamp %XSRC%/examples/calcxx/calcxx-parser.stamp
-test -f %XSRC%/examples/calcxx/calcxx-parser.stamp
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-parser.stamp %XSRC%/examples/calcxx/calcxx-parser.stamp
-test -f %XSRC%/examples/calcxx/calc++-parser.yy
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++-parser.yy %XSRC%/examples/calcxx/calcxx-parser.yy
-test -f %XSRC%/examples/calcxx/calcxx-parser.yy
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp-parser.yy %XSRC%/examples/calcxx/calcxx-parser.yy
-test -f %XSRC%/examples/calcxx/calc++.cc
-if not errorlevel 1 mv -f %XSRC%/examples/calcxx/calc++.cc %XSRC%/examples/calcxx/calcxx.cc
-test -f %XSRC%/examples/calcxx/calcxx.cc
-if errorlevel 1 mv -f %XSRC%/examples/calcxx/calcpp.cc %XSRC%/examples/calcxx/calcxx.cc
-
-Rem Fixing #include lines in calcxx files.
-sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx.cc > calcxx.cc
-if errorlevel 1 goto calcxxFileError
-mv ./calcxx.cc %XSRC%/examples/calcxx/calcxx.cc
-sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-driver.cc > calcxx-driver.cc
-if errorlevel 1 goto calcxxFileError
-mv ./calcxx-driver.cc %XSRC%/examples/calcxx/calcxx-driver.cc
-sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-driver.hh > calcxx-driver.hh
-if errorlevel 1 goto calcxxFileError
-mv ./calcxx-driver.hh %XSRC%/examples/calcxx/calcxx-driver.hh
-sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-parser.cc > calcxx-parser.cc
-if errorlevel 1 goto calcxxFileError
-mv ./calcxx-parser.cc %XSRC%/examples/calcxx/calcxx-parser.cc
-sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-parser.hh > calcxx-parser.hh
-if errorlevel 1 goto calcxxFileError
-mv ./calcxx-parser.hh %XSRC%/examples/calcxx/calcxx-parser.hh
-:sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-parser.yy > calcxx-parser.yy
-:if errorlevel 1 goto calcxxFileError
-:mv ./calcxx-parser.yy %XSRC%/examples/calcxx/calcxx-parser.yy
-sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-scanner.cc > calcxx-scanner.cc
-if errorlevel 1 goto calcxxFileError
-mv ./calcxx-scanner.cc %XSRC%/examples/calcxx/calcxx-scanner.cc
-:sed "/#[	 ]*include/s/++/xx/" %XSRC%/examples/calcxx/calcxx-scanner.ll > calcxx-scanner.ll
-:if errorlevel 1 goto calcxxFileError
-:mv ./calcxx-scanner.ll %XSRC%/examples/calcxx/calcxx-scanner.ll
-sed "s/calc++/calcxx/" %XSRC%/examples/calcxx/test > test
-if errorlevel 1 goto calcxxFileError
-mv ./test %XSRC%/examples/calcxx/test
-
-
-Rem Fixing the scanner files to make file names 8.3 valid.
-Rem Use only if you want to change the scan-gram.l and scan-skel.l files.
-: sed "/outfile=/s/\.yy/yy/" %XSRC%/src/scan-gram.l > scan-gram.l
-: if errorlevel 1 goto ScannerFileError
-: mv ./scan-gram.l %XSRC%/src/scan-gram.l
-: sed "/outfile=/s/\.yy/yy/" %XSRC%/src/scan-skel.l > scan-skel.l
-: if errorlevel 1 goto ScannerFileError
-: mv ./scan-skel.l %XSRC%/src/scan-skel.l
-
-
-Rem This is required because DOS/Windows are case-insensitive
-Rem to file names, and "make install" will do nothing if Make
-Rem finds a file called `install'.
-if exist INSTALL ren INSTALL INSTALL.txt
-
-Rem Set SHELL to a sane default or some configure tests stop working
-Rem if the package is configured across partitions.
-if not "%SHELL%" == "" goto HomeName
-set SHELL=/bin/sh
-if not "%SHELL%" == "/bin/sh" goto SmallEnv
-echo No SHELL found in the environment, using default value
-
-:HomeName
-Rem Set HOME to a sane default so configure stops complaining.
-if not "%HOME%" == "" goto HostName
-set HOME=%XSRC%/djgpp
-if not "%HOME%" == "%XSRC%/djgpp" goto SmallEnv
-echo No HOME found in the environment, using default value
-
-:HostName
-Rem Set HOSTNAME so it shows in config.status
-if not "%HOSTNAME%" == "" goto hostdone
-if "%windir%" == "" goto msdos
-set OS=MS-Windows
-if not "%OS%" == "MS-Windows" goto SmallEnv
-goto haveos
-:msdos
-set OS=MS-DOS
-if not "%OS%" == "MS-DOS" goto SmallEnv
-:haveos
-if not "%USERNAME%" == "" goto haveuname
-if not "%USER%" == "" goto haveuser
-echo No USERNAME and no USER found in the environment, using default values
-set HOSTNAME=Unknown PC
-if not "%HOSTNAME%" == "Unknown PC" goto SmallEnv
-goto userdone
-:haveuser
-set HOSTNAME=%USER%'s PC
-if not "%HOSTNAME%" == "%USER%'s PC" goto SmallEnv
-goto userdone
-:haveuname
-set HOSTNAME=%USERNAME%'s PC
-if not "%HOSTNAME%" == "%USERNAME%'s PC" goto SmallEnv
-:userdone
-set _HOSTNAME=%HOSTNAME%, %OS%
-if not "%_HOSTNAME%" == "%HOSTNAME%, %OS%" goto SmallEnv
-set HOSTNAME=%_HOSTNAME%
-:hostdone
-set _HOSTNAME=
-set OS=
-
-Rem install-sh is required by the configure script but clashes with the
-Rem various Makefile install-foo targets, so we MUST have it before the
-Rem script runs and rename it afterwards
-test -f %XSRC%/install-sh
-if not errorlevel 1 goto NoRen0
-test -f %XSRC%/install-sh.sh
-if not errorlevel 1 mv -f %XSRC%/install-sh.sh %XSRC%/install-sh
-:NoRen0
-
-if "%NLS%" == "disabled" goto WithoutNLS
-
-:WithNLS
-Rem Check for the needed libraries and binaries.
-test -x /dev/env/DJDIR/bin/msgfmt.exe
-if errorlevel 1 goto MissingNLSTools
-test -x /dev/env/DJDIR/bin/xgettext.exe
-if errorlevel 1 goto MissingNLSTools
-test -f /dev/env/DJDIR/include/libcharset.h
-if errorlevel 1 goto MissingNLSTools
-test -f /dev/env/DJDIR/lib/libcharset.a
-if errorlevel 1 goto MissingNLSTools
-test -f /dev/env/DJDIR/include/iconv.h
-if errorlevel 1 goto MissingNLSTools
-test -f /dev/env/DJDIR/lib/libiconv.a
-if errorlevel 1 goto MissingNLSTools
-test -f /dev/env/DJDIR/include/libintl.h
-if errorlevel 1 goto MissingNLSTools
-test -f /dev/env/DJDIR/lib/libintl.a
-if errorlevel 1 goto MissingNLSTools
-
-Rem Recreate the files in the %XSRC%/po subdir with our ported tools.
-redir -e /dev/null rm %XSRC%/po/*.gmo
-redir -e /dev/null rm %XSRC%/po/bison.pot
-redir -e /dev/null rm %XSRC%/po/cat-id-tbl.c
-redir -e /dev/null rm %XSRC%/po/stamp-cat-id
-
-Rem Update the arguments file for the configure script.
-Rem We prefer without-included-gettext because libintl.a from gettext package
-Rem is the only one that is guaranteed to have been ported to DJGPP.
-echo --enable-nls --without-included-gettext >> args
-goto ConfigurePackage
-
-:MissingNLSTools
-echo Needed libs/tools for NLS not found. Configuring without NLS.
-:WithoutNLS
-Rem Update the arguments file for the configure script.
-echo --disable-nls >> args
-
-:ConfigurePackage
-echo Running the ./configure script...
-sh ./configure @args
-if errorlevel 1 goto CfgError
-rm args
-echo Done.
-goto End
-
-:lalr1_ccFileError
-echo ./data/lalr1.cc file editing failed!
-goto End
-
-:glr_ccFileError
-echo ./data/glr.cc file editing failed!
-goto End
-
-:getargs_cFileError
-echo ./src/getargs.c file editing failed!
-goto End
-
-:location_ccFileError
-echo ./data/location.cc file editing failed!
-goto End
-
-:calcxxFileError
-echo ./examples/calcxx file editing failed!
-goto End
-
-:ScannerFileError
-echo ./scanner file editing failed!
-goto End
-
-:SedError
-echo ./configure script editing failed!
-goto End
-
-:SedError2
-echo ./lib/config.hin editing failed!
-goto End
-
-:SedError3
-echo ./tests/testsuite editing failed!
-goto End
-
-:CfgError
-echo ./configure script exited abnormally!
-goto End
-
-:SmallEnv
-echo Your environment size is too small.  Enlarge it and run me again.
-echo Configuration NOT done!
-
-:End
-test -f %XSRC%/install-sh.sh
-if not errorlevel 1 goto NoRen1
-test -f %XSRC%/install-sh
-if not errorlevel 1 mv -f %XSRC%/install-sh %XSRC%/install-sh.sh
-:NoRen1
-if "%SHELL%" == "/bin/sh" set SHELL=
-if "%HOME%" == "%XSRC%/djgpp" set HOME=
-set CONFIG_SITE=
-set HOSTNAME=
-set NLS=
-set XSRC=

djgpp/config.sed

@@ -1,190 +0,0 @@
-# DJGPP specific configuration file.
-# Sed script for additional DJGPP specific editing
-# of the configure script generated by autoconf 2.62.
-
-# Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-# Additional editing of Makefiles
-/^eval sed.*ac_file_inputs.*tmp\/out \\$/ {
-:loop
-n
-/^$/!b loop
-a\
-cat > "$tmp/subs-djgpp.sed" << eof_djgpp\
-# DJGPP specific Makefile changes.\
-s,\\.deps,_deps,g\
-s,\\.libs,_libs,g\
-s,\\.new\\.,_new.,g\
-s,\\.old\\.,_old.,g\
-s,\\.tab\\.,_tab.,g\
-s,c++\\.at,cxx.at,g\
-s,c++\\.m4,cxx.m4,g\
-s,c++-skel\\.m4,cxx-skel.m4,g\
-s,calc++,calcxx,g\
-s,scan-gram-c,c-scan-gram,g\
-s,scan-skel-c,c-scan-skel,g\
-s,inttypes_,_inttypes,g\
-s,javacomp\\.sh\\.in,javacomp.sh-in,g\
-s,javaexec\\.sh\\.in,javaexec.sh-in,g\
-s,yacc\\.1\\.in,yacc.1-in,g\
-s,bench\\.pl\\.in,bench.pl-in,g\
-s,Makefile\\.am\\.in,Makefile.am-in,g\
-s,Makefile\\.in\\.in,Makefile.in-in,g\
-/^\\.y\\.c:/,/^$/ {\
-  /\\\$(YACCCOMPILE)/ {\
-    a\\\\\
-	-@test -f y.tab.c && mv -f y.tab.c y_tab.c\\\\\
-	-@test -f y.tab.h && mv -f y.tab.h y_tab.h\
-  }\
-}\
-/^libbison.a:/ i\\\\\
-\\$(top_srcdir)/djgpp/subpipe.c: \\$(top_srcdir)/djgpp/subpipe.h\\\\\
-subpipe.o: \\$(top_srcdir)/djgpp/subpipe.c \\$(top_srcdir)/djgpp/subpipe.h\\\\\
-	\\$(COMPILE) -c \\$<\
-/^yacc:/ i\\\\\
-yacc.bat:\\\\\
-	echo "bison\\$(EXEEXT) -y %1 %2 %3 %4 %5 %6 %7 %8 %9" >\\$@\
-/^bin_SCRIPTS =/s/$/ yacc.bat/\
-/^MOSTLYCLEANFILES = yacc/s/$/ yacc.bat/\
-/cross-options.texi:/,/^$/ s|bison|&.exe|g\
-/^\\.x\\.1:/,/^$/ s|\\$program|&.exe|g\
-eof_djgpp\
-sed -f "\$tmp/subs-djgpp.sed" \$tmp/out > \$tmp/out.djgpp\
-mv -f \$tmp/out.djgpp \$tmp/out
-}
-
-# Makefile.in.in is renamed to Makefile.in-in.
-/ac_config_files=/ {
-  /runtime-po/!s|po/Makefile\.in|&:po/Makefile.in-in|
-  s|runtime-po/Makefile\.in|&:runtime-po/Makefile.in-in|
-  s|javacomp\.sh\.in|javacomp.sh-in|
-  s|javaexec\.sh\.in|javaexec.sh-in|
-  s|doc/yacc\.1|&:doc/yacc.1-in|
-  s|etc/bench.pl|&:etc/bench.pl-in|
-}
-
-/CONFIG_FILES=/ {
-  /runtime-po/!s|po/Makefile\.in|&:po/Makefile.in-in|2
-  s|runtime-po/Makefile\.in|&:runtime-po/Makefile.in-in|2
-  s|javacomp\.sh\.in|javacomp.sh-in|
-  s|javaexec\.sh\.in|javaexec.sh-in|
-  s|doc/yacc\.1|&:doc/yacc.1-in|2
-  s|etc/bench\.pl|&:etc/bench.pl-in|2
-}
-
-# We always use _deps and _libs instead of .deps and .libs, because
-# the latter is an invalid name on 8+3 MS-DOS file system.  This makes
-# the generated Makefiles good for every DJGPP installation, not only
-# the one where the package was configured (which could happen to be
-# a Windows box, where leading dots in file names are allowed).
-/^rmdir[	 ]*\.tst/ i\
-am__leading_dot=_
-
-# Replace (command) > /dev/null with `command > /dev/null`, since
-# parenthesized commands always return zero status in the ported Bash,
-# even if the named command doesn't exist
-/if ([^|;`]*null/{
-  s,(,`,
-  s,),,
-  /null[	 ]*2>&1/ s,2>&1,&`,
-  /null.*null/ s,null.*null,&`,
-  /null.*null/ !{
-    /null[	 ]*2>&1/ !s,null,&`,
-  }
-}
-
-# DOS-style absolute file names should be supported as well
-/\*) top_srcdir=/s,/\*,[\\\\/]* | ?:[\\\\/]*,
-
-# The following two items are changes needed for configuring
-# and compiling across partitions.
-# 1) The given srcdir value is always translated from the
-#    "x:" syntax into "/dev/x" syntax while we run configure.
-/^[	 ]*-srcdir=\*.*$/ a\
-    ac_optarg=`echo "$ac_optarg" | sed "s,^\\([A-Za-z]\\):,/dev/\\1,"`
-/set X `ls -Lt \$srcdir/ i\
-   if `echo $srcdir | grep "^/dev/" - > /dev/null`; then\
-     srcdir=`echo "$srcdir" | sed -e "s%^/dev/%%" -e "s%/%:/%"`\
-   fi
-
-# Autoconf 2.52e generated configure scripts
-# write absolute paths into Makefiles and bison.in
-# making them useless for DJGPP installations for
-# which the package has not been configured for.
-/MISSING=/,/^$/ {
-  /^fi$/ a\
-am_missing_run=`echo "$am_missing_run" | sed 's%/dev/.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%${top_srcdir}%;s%.:.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%${top_srcdir}%'`
-}
-/^install_sh=/a\
-install_sh=`echo "$install_sh" | sed 's%/dev/.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%${top_srcdir}%;s%.:.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%${top_srcdir}%'`
-
-# This will only work if the assumption that the
-# testsuite is ran from the following path:
-#   ${top_srcdir}/tests/testsuite.dir
-# holds. The explicit names are of no importance.
-#   ../../. == ${top_srcdir}
-#/^esac$/,/^ac_abs_srcdir=/ {
-/^ac_abs_srcdir=/ i\
-ac_abs_builddir=`echo "$ac_abs_builddir" | sed "s%/dev/.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../.%;s%.:.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../.%"`\
-ac_abs_top_builddir=`echo "$ac_abs_top_builddir" | sed "s%/dev/.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../..%;s%.:.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../..%"`\
-ac_abs_top_srcdir=`echo "$ac_abs_top_srcdir" | sed "s%/dev/.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../..%;s%.:.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../..%"`
-#ac_abs_srcdir=`echo "$ac_abs_srcdir" | sed "s%/dev/.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../.%;s%.:.*/bison[-_0-9]\\{1,1\\}[-.0-9A-Za-z+]*%../../.%"`
-/^ac_abs_srcdir=/ a\
-for dj_dir in $ac_abs_builddir $ac_abs_top_builddir $ac_abs_top_srcdir $ac_abs_srcdir\
-do\
-  ac_abs_builddir=`echo "$ac_abs_builddir" | sed "s%//%/%g"`\
-  ac_abs_top_builddir=`echo "$ac_abs_top_builddir" | sed "s%//%/%g"`\
-  ac_abs_top_srcdir=`echo "$ac_abs_top_srcdir" | sed "s%//%/%g"`\
-  ac_abs_srcdir=`echo "$ac_abs_srcdir" | sed "s%//%/%g"`\
-done
-
-# Add DJGPP version information.
-/^#define VERSION/ s/\$VERSION/&  (DJGPP port (r1))/
-
-# We need makeinfo to make the html formated docs.
-/\$am_missing_run[	 ]*makeinfo/ s,\$am_missing_run,,
-
-# The path to the FORTRAN compiler and libraries
-# shall contain no absolute path reference so it
-# will be good for all djgpp installations.
-/^FLIBS="\$ac_cv_flibs"/ i\
-ac_djgpp_path=`echo "$DJDIR" | sed 's%\\\\\\%/%g' | tr $as_cr_LETTERS $as_cr_letters`\
-ac_cv_flibs=`echo "$ac_cv_flibs" | sed "s%-L$ac_djgpp_path%-L/dev/env/DJDIR%g"`
-
-# Autoconf generated configure scripts write absolute
-# paths of certain header files into Makefiles making
-# them useless for DJGPP installations for which the
-# package has not been configured for.
-/^.*echo "\$as_me:\$LINENO: result: \$gl_cv_absolute_.*$/ {
-h
-s,^.*\(gl_cv_absolute_\)\([a-z0-9_]*\)\(_h\).*$,\1\2\3=`echo $\1\2\3 | sed "s%[^:]:.*/include/%/dev/env/DJDIR/include/%"`,
-G
-}
-/^.*echo "\$as_me:\$LINENO: result: \$gl_cv_full_.*$/ {
-h
-s,^.*\(gl_cv_full_\)\([a-z0-9_]*\)\(_h\).*$,\1\2\3=`echo $\1\2\3 | sed "s%[^:]:.*/include/%/dev/env/DJDIR/include/%"`,
-G
-}
-
-# The following is not a valid DOS file name
-s/calc++/calcxx/g
-
-# The CR test for awk does not work for DJGPP.
-/^ac_cs_awk_cr=/,/^$/ {
-  /^fi$/ a\
-ac_cs_awk_cr=$ac_cr
-}

djgpp/config.site

@@ -1,85 +0,0 @@
-#! /bin/sh
-
-# This is the config.site file for configuring GNU packages
-# which are to be built with DJGPP tools.
-
-# Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-# Include the djgpp subdirectory in PATH, so that getconf is found
-PATH="$srcdir/djgpp:$PATH"
-
-# These two variables are required, otherwise looking for
-# programs along the PATH will not work.
-PATH_SEPARATOR=:
-PATH_EXPAND=y
-
-# This is required in for "test -f foo" to find foo.exe
-export TEST_FINDS_EXE=y
-
-# The root of the DJGPP tree serves as the default prefix
-test "x$prefix" = xNONE && prefix='/dev/env/DJDIR'
-
-# This is required for config.status script to be run, since
-# ./configure runs it by invoking ${CONFIG_SHELL-/bin/sh}
-CONFIG_SHELL=${CONFIG_SHELL='sh'}
-
-# These are set here so the generated Makefile's will be good
-# for every DJGPP installation, not only the one where the
-# package was configured.
-# $INSTALL must be an absolute path name, otherwise config.status
-# will try to prepend ./ and ../ to it when it goes into subdirs.
-INSTALL=${INSTALL='/dev/env/DJDIR/bin/ginstall -c'}
-RANLIB=${RANLIB='ranlib'}
-GMSGFMT=${GMSGFMT='/dev/env/DJDIR/bin/msgfmt'}
-MSGFMT=${MSGFMT='/dev/env/DJDIR/bin/msgfmt'}
-XGETTEXT=${XGETTEXT='/dev/env/DJDIR/bin/xgettext'}
-AWK=${AWK='gawk'}
-
-# A sane default for emacs.
-ac_cv_path_EMACS=${EMACS='/dev/env/DJDIR/gnu/emacs/bin/emacs'}
-
-# A sane default for m4.
-ac_cv_path_M4=${M4='/dev/env/DJDIR/bin/m4'}
-
-# A sane default for grep.
-ac_cv_path_GREP=${GREP='/dev/env/DJDIR/bin/grep'}
-
-# A sane default for egrep.
-ac_cv_path_EGREP=${EGREP='/dev/env/DJDIR/bin/egrep'}
-
-# A sane default for fgrep.
-ac_cv_path_FGREP=${FGREP='/dev/env/DJDIR/bin/fgrep'}
-
-# A sane default for sed.
-ac_cv_path_SED=${SED='/dev/env/DJDIR/bin/sed'}
-
-# A sane default for mkdir.
-ac_cv_path_mkdir=${MKDIR_P='/dev/env/DJDIR/bin/mkdir -p'}
-
-# These are set here so the generated libtool will be good
-# for every DJGPP installation, not only the one where the
-# package was configured.
-NM=${NM='nm'}
-LD=${LD='ld'}
-
-# Force the test for 'ln -s' to report 'cp -pf'.
-ac_cv_prog_LN_S='cp -pf'
-
-# There is no fork and vfork functionality.
-ac_cv_func_fork=no
-ac_cv_func_vfork=no
-ac_cv_func_pipe=no

djgpp/djunpack.bat

@@ -1,87 +0,0 @@
-@echo off
-Rem
-Rem WARNING WARNING WARNING: This file needs to have DOS CRLF end-of-line
-Rem format, or else stock DOS/Windows shells will refuse to run it.
-Rem
-Rem This batch file unpacks the Bison distribution while simultaneously
-Rem renaming some of the files whose names are invalid on DOS or conflict
-Rem with other file names after truncation to DOS 8+3 namespace.
-Rem
-Rem Copyright (C) 2005-2012 Free Software Foundation, Inc.
-Rem
-Rem This program is free software: you can redistribute it and/or modify
-Rem it under the terms of the GNU General Public License as published by
-Rem the Free Software Foundation, either version 3 of the License, or
-Rem (at your option) any later version.
-Rem
-Rem This program is distributed in the hope that it will be useful,
-Rem but WITHOUT ANY WARRANTY; without even the implied warranty of
-Rem MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-Rem GNU General Public License for more details.
-Rem
-Rem You should have received a copy of the GNU General Public License
-Rem along with this program.  If not, see <http://www.gnu.org/licenses/>.
-Rem
-Rem
-Rem Invoke like this:
-Rem
-Rem     djunpack bison-XYZ.tar.gz
-Rem or
-Rem     djunpack bison-XYZ.tar.bz2
-Rem
-Rem where XYZ is the version number.  If the argument includes leading
-Rem directories, it MUST use backslashes, not forward slashes.
-Rem
-
-set ENVIRONMENT_SIZE_TEST_STRING=ENVIRONMENT_SIZE_TEST_STRING
-if "%ENVIRONMENT_SIZE_TEST_STRING%"=="ENVIRONMENT_SIZE_TEST_STRING" GoTo EnvOk
-Rem If their environment space is too small, re-exec with a larger one
-command.com /e:4096 /c %0 %1
-GoTo End
-
-:EnvOk
-set ENVIRONMENT_SIZE_TEST_STRING=
-if "%1" == "" GoTo NoArgument
-if not exist %1 GoTo NoArchive
-Rem Extract top src dir from archive file.
-djtar -t %1 > top_src.dir
-Rem The following uses a feature of COPY whereby it does not copy
-Rem empty files.  We need that because the previous line will create
-Rem an empty fnchange.tmp even if the command failed for some reason.
-copy top_src.dir junk.tmp > nul
-if not exist junk.tmp GoTo NoDjTar
-del junk.tmp
-sed "1{s/^.*bison-/djtar -x -p -o bison-/;s|$|djgpp/fnchange.lst %%1 > fnchange.tmp|};2,$d" top_src.dir > ext_list.bat
-Rem See the comment above about the reason for using COPY.
-copy ext_list.bat junk.tmp > nul
-if not exist junk.tmp GoTo NoSed
-del junk.tmp
-Rem Extract fnchange.lst from archive.
-call ext_list.bat %1
-del ext_list.bat
-sed "1{s|^.*bison-|s/@V@/bison-|;s|$|g|};2,$d" top_src.dir > version.sed
-sed -f version.sed < fnchange.tmp > fnchange.lst
-del version.sed
-del fnchange.tmp
-del top_src.dir
-Rem unpack the source distribution
-djtar -x -n fnchange.lst %1
-del fnchange.lst
-GoTo End
-
-:NoSed
-del junk.tmp
-echo FAIL: Sed is not available.
-GoTo End
-:NoDjTar
-del junk.tmp
-echo FAIL: DJTAR is not available or no fnchange.lst file in %1.
-GoTo End
-:NoArchive
-echo FAIL: the file %1 does not seem to exist.
-echo Remember that %1 cannot use forward slashes, only backslashes.
-GoTo End
-:NoArgument
-echo FAIL: no archive file has been specified.
-echo Remember that the file name cannot use forward slashes, only backslashes.
-:End

djgpp/fnchange.lst

@@ -1,27 +0,0 @@
-@V@/build-aux/javacomp.sh.in              @V@/build-aux/javacomp.sh-in
-@V@/build-aux/javaexec.sh.in              @V@/build-aux/javaexec.sh-in
-@V@/data/c++-skel.m4                      @V@/data/cxx-skel.m4
-@V@/data/c++.m4                           @V@/data/cxx.m4
-@V@/doc/yacc.1.in                         @V@/doc/yacc.1-in
-@V@/etc/bench.pl.in                       @V@/etc/bench.pl-in
-@V@/examples/calc++/                      @V@/examples/calcxx/
-@V@/examples/calc++/Makefile.am           @V@/examples/calcxx/Makefile.am
-@V@/examples/calc++/Makefile.in           @V@/examples/calcxx/Makefile.in
-@V@/examples/calc++/calc++-scanner.cc     @V@/examples/calcxx/calcxx-scanner.cc
-@V@/examples/calc++/calc++-scanner.ll     @V@/examples/calcxx/calcxx-scanner.ll
-@V@/examples/calc++/calc++.cc             @V@/examples/calcxx/calcxx.cc
-@V@/examples/calc++/calc++-driver.hh      @V@/examples/calcxx/calcxx-driver.hh
-@V@/examples/calc++/calc++-driver.cc      @V@/examples/calcxx/calcxx-driver.cc
-@V@/examples/calc++/stack.hh              @V@/examples/calcxx/stack.hh
-@V@/examples/calc++/position.hh           @V@/examples/calcxx/position.hh
-@V@/examples/calc++/location.hh           @V@/examples/calcxx/location.hh
-@V@/examples/calc++/calc++-parser.hh      @V@/examples/calcxx/calcxx-parser.hh
-@V@/examples/calc++/calc++-parser.cc      @V@/examples/calcxx/calcxx-parser.cc
-@V@/examples/calc++/calc++-parser.stamp   @V@/examples/calcxx/calcxx-parser.stamp
-@V@/examples/calc++/calc++-parser.yy      @V@/examples/calcxx/calcxx-parser.yy
-@V@/examples/calc++/test                  @V@/examples/calcxx/test
-@V@/po/Makefile.in.in                     @V@/po/Makefile.in-in
-@V@/runtime-po/Makefile.in.in             @V@/runtime-po/Makefile.in-in
-@V@/src/scan-gram-c.c                     @V@/src/c-scan-gram.c
-@V@/src/scan-skel-c.c                     @V@/src/c-scan-skel.c
-@V@/tests/c++.at                          @V@/tests/cxx.at

djgpp/subpipe.c

@@ -1,293 +0,0 @@
-/* Subprocesses with pipes.
-
-   Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* Written by Juan Manuel Guerrero <[email protected]>. */
-
-
-#include <config.h>
-
-#include "subpipe.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <sys/stat.h>
-#include <process.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include "xalloc.h"
-
-
-#ifndef STDIN_FILENO
-# define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-# define STDOUT_FILENO 1
-#endif
-
-
-#include "error.h"
-
-#include "gettext.h"
-#define _(Msgid)  gettext (Msgid)
-
-
-/* Initialize this module. */
-
-
-static int old_stdin;
-static int old_stdout;
-static char **arguments;
-static char tmp_file_name[2][L_tmpnam];
-
-#define remove_tmp_file(fd, name)                                     \
-  do {                                                                \
-    close ((fd));                                                     \
-    if (unlink ((name)))                                              \
-      error (EXIT_FAILURE, 0, _("removing of '%s' failed"), (name));  \
-  } while (0)
-
-
-void
-init_subpipe(void)
-{
-  char *tmpdir;
-  int fd;
-
-  tmpdir = getenv("TMPDIR");
-  if (tmpdir == NULL)
-    tmpdir = getenv("TMP");
-  if (tmpdir == NULL)
-    tmpdir = getenv("TEMP");
-  if (access(tmpdir, D_OK))
-    tmpdir = ".";
-
-  strcpy(tmp_file_name[0], tmpdir);
-  strcat(tmp_file_name[0], "/bnXXXXXX");
-  fd = mkstemp(tmp_file_name[0]);
-  if (fd < 0)
-    error(EXIT_FAILURE, 0, _("creation of a temporary file failed"));
-  close (fd);
-
-  strcpy(tmp_file_name[1], tmpdir);
-  strcat(tmp_file_name[1], "/bnXXXXXX");
-  fd = mkstemp(tmp_file_name[1]);
-  if (fd < 0)
-    error(EXIT_FAILURE, 0, _("creation of a temporary file failed"));
-  close (fd);
-}
-
-
-/* Create a subprocess that is run as a filter.  ARGV is the
-   NULL-terminated argument vector for the subprocess.  Store read and
-   write file descriptors for communication with the subprocess into
-   FD[0] and FD[1]: input meant for the process can be written into
-   FD[0], and output from the process can be read from FD[1].  Return
-   the subprocess id.
-
-   Because DOS has neither fork nor pipe functionality to run the subprocess
-   as a filter, the filter is reproduced using temporary files. First bison's
-   stdout is redirected to a temporary file. After bison has produced all of
-   is output, this file is closed and connected to m4's stdin. All m4's output
-   is redirected from m4's stdout to a second temporary file and reopened as
-   bison's stdin. */
-
-pid_t
-create_subpipe(char const *const *argv, int fd[2])
-{
-  int argc;
-  int from_in_fd;  /* pipe from bison to m4. */
-  pid_t pid;
-
-
-  pid = getpid();
-
-  /*
-   *  Save original stdin and stdout
-   *  for later restauration.
-   */
-  old_stdin = dup(STDIN_FILENO);
-  if (old_stdin < 0)
-    error(EXIT_FAILURE, 0, _("saving stdin failed"));
-
-  old_stdout = dup(STDOUT_FILENO);
-  if (old_stdout < 0)
-    error(EXIT_FAILURE, 0, _("saving stdout failed"));
-
-  /*
-   *  Save argv for later use.
-   */
-  for (argc = 0; argv[argc]; argc++)
-    ;
-  argc++;
-  arguments = xmalloc(argc * sizeof(arguments[0]));
-  for (argc = 0; argv[argc]; argc++)
-  {
-    arguments[argc] = xmalloc((strlen(argv[argc]) + 1) * sizeof(arguments[0][0]));
-    strcpy(arguments[argc], argv[argc]);
-  }
-  arguments[argc] = NULL;
-
-  /*
-   *  All bison's output will be gathered in this temporary file
-   *  and will be redirected to m4's stdin.
-   */
-  from_in_fd = open(tmp_file_name[0], O_WRONLY | O_CREAT | O_TRUNC, S_IWUSR);
-  if (from_in_fd < 0)
-    error(EXIT_FAILURE, 0, _("opening of tmpfile failed"));
-  if (dup2(from_in_fd, STDOUT_FILENO) < 0)
-  {
-    remove_tmp_file(from_in_fd, tmp_file_name[0]);
-    error(EXIT_FAILURE, 0, _("redirecting bison's stdout to the temporary file failed"));
-  }
-  close(from_in_fd);
-
-
-  fd[0] = STDOUT_FILENO;
-  return pid;
-}
-
-
-/* A signal handler that just records that a signal has happened. */
-static int child_interrupted;
-
-static void
-signal_catcher(int signo)
-{
-  child_interrupted++;
-}
-
-
-void
-end_of_output_subpipe(pid_t pid, int fd[2])
-{
-  char *program;
-  int from_out_fd = open(tmp_file_name[0], O_RDONLY, S_IRUSR);                   /* pipe from bison to m4. */
-  int to_in_fd = open(tmp_file_name[1], O_WRONLY | O_CREAT | O_TRUNC, S_IWUSR);  /* pipe from m4 to bison. */
-  int status;
-  void (*previous_handler)(int);
-
-
-  program = strrchr(arguments[0], '/');
-  if (program)
-    program++;
-  else
-    program = arguments[0];
-
-  /*
-   *  Redirect bison's output to m4's stdin.
-   */
-  if (from_out_fd < 0)
-    error(EXIT_FAILURE, 0, _("opening of tmpfile failed"));
-  if (dup2(from_out_fd, STDIN_FILENO) < 0)
-  {
-    remove_tmp_file(from_out_fd, tmp_file_name[0]);
-    error(EXIT_FAILURE, 0, _("redirecting m4's stdin from the temporary file failed"));
-  }
-  close(from_out_fd);
-
-  /*
-   *  All m4's output will be gathered in this temporary file
-   *  and will be redirected to bison's stdin.
-   */
-  if (to_in_fd < 0)
-  {
-    remove_tmp_file(STDIN_FILENO, tmp_file_name[0]);
-    error(EXIT_FAILURE, 0, _("opening of a temporary file failed"));
-  }
-  if (dup2(to_in_fd, STDOUT_FILENO) < 0)
-  {
-    remove_tmp_file(STDIN_FILENO, tmp_file_name[0]);
-    remove_tmp_file(to_in_fd, tmp_file_name[1]);
-    error(EXIT_FAILURE, 0, _("redirecting m4's stdout to a temporary file failed"));
-  }
-  close(to_in_fd);
-
-  /*
-   *  Run m4.
-   */
-  child_interrupted = 0;
-  errno = 0;
-  previous_handler = signal(SIGINT, signal_catcher);
-  status = spawnvp(P_WAIT, program, arguments);
-  signal(SIGINT, previous_handler);
-  if (child_interrupted)
-  {
-    remove_tmp_file(STDIN_FILENO, tmp_file_name[0]);
-    remove_tmp_file(STDOUT_FILENO, tmp_file_name[1]);
-    error(EXIT_FAILURE, 0, _("subsidiary program '%s' interrupted"), program);
-  }
-  if (status)
-  {
-    remove_tmp_file(STDIN_FILENO, tmp_file_name[0]);
-    remove_tmp_file(STDOUT_FILENO, tmp_file_name[1]);
-    error(EXIT_FAILURE, 0, _(errno == ENOENT
-			     ? "subsidiary program '%s' not found"
-			     : status < 1
-			     ? "subsidiary program '%s' failed"
-			     : "subsidiary program '%s' failed (status=%i, errno=%i)"), program, status, errno);
-  }
-
-
-  /*
-   *  Redirect m4's output to bison's stdin.
-   */
-  if (dup2(old_stdout, STDOUT_FILENO) < 0)
-    error(EXIT_FAILURE, 0, "restore of bison's stdout failed");
-  close(old_stdout);
-  to_in_fd = open(tmp_file_name[1], O_RDONLY, S_IRUSR);  /* pipe from m4 to bison. */
-  if (to_in_fd < 0)
-  {
-    remove_tmp_file(STDIN_FILENO, tmp_file_name[0]);
-    error(EXIT_FAILURE, 0, _("opening of tmpfile failed"));
-  }
-  if (dup2(to_in_fd, STDIN_FILENO) < 0)
-  {
-    remove_tmp_file(STDIN_FILENO, tmp_file_name[0]);
-    remove_tmp_file(to_in_fd, tmp_file_name[1]);
-    error(EXIT_FAILURE, -1, "dup2");
-    error(EXIT_FAILURE, 0, _("redirecting bison's stdin from the temporary file failed"));
-  }
-  close(to_in_fd);
-
-
-  fd[1] = STDIN_FILENO;
-}
-
-
-/* Free resources, unlink temporary files and restore stdin and stdout. */
-
-void
-reap_subpipe(pid_t pid, char const *program)
-{
-  int argc;
-
-  for (argc = 0; arguments[argc]; argc++)
-    free(arguments[argc]);
-  free(arguments);
-
-  if (unlink(tmp_file_name[0]))
-    error(EXIT_FAILURE, 0, _("removing of '%s' failed"), tmp_file_name[0]);
-  if (unlink(tmp_file_name[1]))
-    error(EXIT_FAILURE, 0, _("removing of '%s' failed"), tmp_file_name[1]);
-
-  if (dup2(old_stdin, STDIN_FILENO) < 0)
-    error(EXIT_FAILURE, 0, "restore of bison's stdin failed");
-  close(old_stdin);
-}

djgpp/subpipe.h

@@ -1,27 +0,0 @@
-/* Subprocesses with pipes.
-
-   Copyright (C) 2005-2012 Free Software Foundation, Inc.
-
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* Written by Juan Manuel Guerrero <[email protected]>. */
-
-#if HAVE_SYS_TYPES_H
-# include <sys/types.h>
-#endif
-
-void init_subpipe(void);
-pid_t create_subpipe(char const * const *, int[2]);
-void end_of_output_subpipe(pid_t, int[2]);
-void reap_subpipe(pid_t, char const *);

doc/.gitignore

@@ -1,26 +1,29 @@
+# Do not ignore these.  The release procedure (web-manual-update)
+# works in the src tree (even when run from the build tree) and leaves
+# these files around.  Since they take precedence over the files in
+# the build tree, locally built manuals use obsolete auxiliary files.
+#
+# So don't hide them, give the maintainer a chance to clean them.
+#/bison.aux
+#/bison.cp
+#/bison.cps
+#/bison.toc
+
 /*~
 /.dirstamp
-/Makefile
-/Makefile.in
 /bison.1
-/bison.aux
-/bison.cp
-/bison.cps
 /bison.dvi
-/bison.fn
+/bison.help
 /bison.html
 /bison.info
-/bison.ky
+/bison.info.bak
 /bison.log
 /bison.pdf
-/bison.pg
 /bison.ps
-/bison.toc
-/bison.tp
-/bison.vr
 /cross-options.texi
 /fdl.texi
 /gendocs_template
+/gendocs_template_min
 /gpl-3.0.texi
 /refcard.dvi
 /refcard.log
@@ -28,3 +31,6 @@
 /stamp-vti
 /version.texi
 /yacc.1
+/relocatable.texi
+/figs/*.eps
+/figs/*.svg

doc/Makefile.am

@@ -1,124 +0,0 @@
-## Process this file with automake to produce Makefile.in -*-Makefile-*-
-
-## Copyright (C) 2001-2003, 2005-2012 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-AM_MAKEINFOFLAGS = --no-split
-info_TEXINFOS = bison.texi
-bison_TEXINFOS = $(srcdir)/cross-options.texi gpl-3.0.texi fdl.texi
-
-CLEANFILES = bison.fns
-CLEANDIRS = *.t2d
-clean-local:
-	rm -rf $(CLEANDIRS)
-
-CROSS_OPTIONS_PL = $(top_srcdir)/build-aux/cross-options.pl
-$(srcdir)/cross-options.texi: $(top_srcdir)/src/getargs.c $(CROSS_OPTIONS_PL)
-	$(AM_V_GEN)mv -f $@ $@~ || : >$@~
-	$(AM_V_at)rm -f $@.tmp
-	$(AM_V_at)cd $(top_builddir)/src && $(MAKE) $(AM_MAKEFLAGS) bison
-	$(AM_V_at)$(top_builddir)/src/bison --help \
-	  | $(PERL) $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >$@.tmp
-	$(AM_V_at)diff -u $@~ $@.tmp || true
-	$(AM_V_at)mv $@.tmp $@
-MAINTAINERCLEANFILES = $(srcdir)/cross-options.texi
-
-## ---------- ##
-## Ref card.  ##
-## ---------- ##
-
-EXTRA_DIST = refcard.tex
-CLEANFILES += refcard.dvi refcard.log refcard.ps
-
-refcard.dvi: refcard.tex
-	$(AM_V_GEN)tex refcard.tex
-
-refcard.ps: refcard.dvi
-
-
-## ----------- ##
-## Man Pages.  ##
-## ----------- ##
-
-dist_man_MANS = $(srcdir)/bison.1
-
-EXTRA_DIST += $(dist_man_MANS:.1=.x) common.x
-MAINTAINERCLEANFILES += $(dist_man_MANS)
-
-# Depend on configure to get version number changes.
-common_dep = $(top_srcdir)/configure $(srcdir)/common.x
-srcsrcdir = $(top_srcdir)/bin
-$(srcdir)/bison.1:      $(common_dep) $(top_srcdir)/src/getargs.c
-
-# Differences to ignore when comparing the man page (the date).
-remove_time_stamp = \
-  sed 's/^\(\.TH[^"]*"[^"]*"[^"]*\)"[^"]*"/\1/'
-
-MOSTLYCLEANFILES = $(srcdir)/*.t
-
-SUFFIXES = .x .1
-
-PREPATH = $(top_builddir)/src
-.x.1:
-	$(AM_V_GEN)program=`expr "/$*" : '.*/\(.*\)'` &&		\
-	save_IFS=$IFS;							\
-	IFS=$(PATH_SEPARATOR);						\
-	for dir in $(PREPATH); do					\
-	  IFS=$save_IFS;						\
-	  echo cd $$dir '&&' $(MAKE) $(AM_MAKEFLAGS) $$program &&	\
-	  (cd $$dir && $(MAKE) $(AM_MAKEFLAGS) $$program) || exit;	\
-	done
-	$(AM_V_at)PATH="$(PREPATH)$(PATH_SEPARATOR)$$PATH";		     \
-	export PATH;							     \
-	$(HELP2MAN)							     \
-	    --include=$*.x						     \
-	    --include=$(srcdir)/common.x				     \
-	    --output=$@.t `echo '$*' | sed 's,.*/,,'`
-	$(AM_V_at)if $(remove_time_stamp) $@ >$@a.t 2>/dev/null &&	     \
-	   $(remove_time_stamp) $@.t | cmp $@a.t - >/dev/null 2>&1; then     \
-		touch $@;						     \
-	else								     \
-		mv $@.t $@;						     \
-	fi
-	$(AM_V_at)rm -f $@*.t
-
-nodist_man_MANS = yacc.1
-
-## -------------- ##
-## Doxygenation.  ##
-## -------------- ##
-
-DOXYGEN = doxygen
-
-.PHONY: doc html
-
-doc: html
-
-html-local: Doxyfile
-	$(DOXYGEN)
-
-edit = sed -e 's,@PACKAGE_NAME\@,$(PACKAGE_NAME),g' \
-	   -e 's,@PACKAGE_VERSION\@,$(PACKAGE_VERSION),g' \
-	   -e 's,@top_builddir\@,$(top_builddir),g' \
-	   -e 's,@top_srcdir\@,$(top_srcdir),g'
-
-EXTRA_DIST += Doxyfile.in
-CLEANFILES += Doxyfile
-# Sed is used to generate Doxyfile from Doxyfile.in instead of
-# configure, because the former is way faster than the latter.
-Doxyfile: $(srcdir)/Doxyfile.in
-	$(AM_V_GEN)$(edit) $(srcdir)/Doxyfile.in >Doxyfile
-
-CLEANDIRS += html latex

doc/bison.x

@@ -39,7 +39,7 @@ This description of the options that can be given to
 is adapted from the node
 .B Invocation
 in the
-.B bison.texinfo
+.B bison.texi
 manual, which should be taken as authoritative.
 .PP
 .I Bison
@@ -53,3 +53,8 @@ are unique.  When a long option takes an argument, like
 .BR \-\-file-prefix ,
 connect the option name and the argument with
 .BR = .
+
+[see also]
+.BR lex (1),
+.BR flex (1),
+.BR yacc (1).

doc/common.x

@@ -1,4 +0,0 @@
-[see also]
-.BR lex (1),
-.BR flex (1),
-.BR yacc (1).

doc/figs/example-reduce.gv

@@ -0,0 +1,11 @@
+digraph "reduce.y"
+{
+  node [fontname=courier shape=box]
+  edge [fontname=courier]
+
+  1 [label="State 1\n  3 a: \"0\" .  [\".\"]\l  4 b: \"0\" .  [\";\"]\l"]
+  1 -> "1R3" [label="" style=solid]
+ "1R3" [style=filled shape=diamond fillcolor=yellowgreen label="R3"]
+  1 -> "1R4" [label="[\";\"]" style=solid]
+ "1R4" [style=filled shape=diamond fillcolor=yellowgreen label="R4"]
+}

doc/figs/example-reduce.txt

@@ -0,0 +1,13 @@
+       .------------------.
+       |     State 1      |
+       | 3 a: "0" . [";"] |
+       | 4 b: "0" . ["."] |
+       `------------------'
+             /     \
+            /       \ ["."]
+           /         \
+          v           v
+         / \         / \
+        / R \       / R \
+(green) \ 3 /       \ 4 / (green)
+         \ /         \ /

doc/figs/example-shift.gv

@@ -0,0 +1,9 @@
+digraph "shift.y"
+{
+  node [fontname=courier shape=box]
+  edge [fontname=courier]
+
+  3 [label="State 3\n  1 exp: a . \".\"\l"]
+  3 -> 6 [style=solid label="\".\""]
+  6 [label="State 6\n  1 exp: a \".\" .\l"]
+}

doc/figs/example-shift.txt

@@ -0,0 +1,12 @@
+.----------------.
+|    State 3     |
+| 1 exp: a . ";" |
+`----------------'
+        |
+        | ";"
+        |
+        v
+.----------------.
+|    State 6     |
+| 1 exp: a ";" . |
+`----------------'

doc/figs/example.gv

@@ -0,0 +1,35 @@
+// Generated by GNU Bison 2.6.90.
+// Report bugs to <[email protected]>.
+// Home page: <http://www.gnu.org/software/bison/>.
+
+digraph "/tmp/fo.y"
+{
+  node [fontname = courier, shape = box, colorscheme = paired6]
+  edge [fontname = courier]
+
+  0 [label="State 0\n\l  0 $accept: . exp $end\l  1 exp: . a \";\"\l  2    | . b \".\"\l  3 a: . \"0\"\l  4 b: . \"0\"\l"]
+  0 -> 1 [style=solid label="\"0\""]
+  0 -> 2 [style=dashed label="exp"]
+  0 -> 3 [style=dashed label="a"]
+  0 -> 4 [style=dashed label="b"]
+  1 [label="State 1\n\l  3 a: \"0\" .  [\";\"]\l  4 b: \"0\" .  [\".\"]\l"]
+  1 -> "1R3" [style=solid]
+ "1R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
+  1 -> "1R4" [label="[\".\"]", style=solid]
+ "1R4" [label="R4", fillcolor=3, shape=diamond, style=filled]
+  2 [label="State 2\n\l  0 $accept: exp . $end\l"]
+  2 -> 5 [style=solid label="$end"]
+  3 [label="State 3\n\l  1 exp: a . \";\"\l"]
+  3 -> 6 [style=solid label="\";\""]
+  4 [label="State 4\n\l  2 exp: b . \".\"\l"]
+  4 -> 7 [style=solid label="\".\""]
+  5 [label="State 5\n\l  0 $accept: exp $end .\l"]
+  5 -> "5R0" [style=solid]
+ "5R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
+  6 [label="State 6\n\l  1 exp: a \";\" .\l"]
+  6 -> "6R1" [style=solid]
+ "6R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
+  7 [label="State 7\n\l  2 exp: b \".\" .\l"]
+  7 -> "7R2" [style=solid]
+ "7R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
+}

doc/figs/example.txt

@@ -0,0 +1,2 @@
+This file is a stub, not used by the documentation.  If you feel like
+contributing ASCII art for example.gv, please step forward!

doc/figs/example.y

@@ -0,0 +1,4 @@
+%%
+exp: a ";" | b ".";
+a: "0";
+b: "0";

doc/local.mk

@@ -0,0 +1,213 @@
+## Copyright (C) 2001-2003, 2005-2015, 2018-2020 Free Software
+## Foundation, Inc.
+
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+AM_MAKEINFOFLAGS =                                              \
+  --no-split                                                    \
+  --set-customization-variable=SECTION_NAME_IN_TITLE=true       \
+  --set-customization-variable=AVOID_MENU_REDUNDANCY=true       \
+  --set-customization-variable=ICONS=true
+
+info_TEXINFOS = %D%/bison.texi
+%C%_bison_TEXINFOS =                            \
+  $(CROSS_OPTIONS_TEXI)                         \
+  %D%/fdl.texi                                  \
+  %D%/gpl-3.0.texi                              \
+  %D%/relocatable.texi
+
+# Cannot express dependencies directly on file names because of Automake.
+# Obfuscate with a variable.
+%C%_bison = %D%/bison
+$(%C%_bison).dvi: $(FIGS_GV:.gv=.eps)
+$(%C%_bison).info: $(FIGS_GV:.gv=.txt)
+$(%C%_bison).pdf: $(FIGS_GV:.gv=.pdf)
+$(%C%_bison).html: $(FIGS_GV:.gv=.svg)
+
+TEXI2DVI = texi2dvi --build-dir=%D%/bison.t2d -I %D%
+CLEANDIRS += %D%/bison.t2d
+
+MOSTLYCLEANFILES += $(top_srcdir)/%D%/*.tmp
+
+CROSS_OPTIONS_PL = $(top_srcdir)/build-aux/cross-options.pl
+CROSS_OPTIONS_TEXI = $(top_srcdir)/%D%/cross-options.texi
+$(CROSS_OPTIONS_TEXI): %D%/bison.help $(CROSS_OPTIONS_PL)
+# Create $@~ which is the previous contents.  Don't use 'mv' here so
+# that even if we are interrupted, the file is still available for
+# diff in the next run.  Note that $@ might not exist yet.
+	$(AM_V_GEN){ test ! -f $@ || cat $@; } >$@~
+	$(AM_V_at)test ! -f $@.tmp || rm -f $@.tmp
+	$(AM_V_at)$(PERL) $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l \
+	  <$(top_srcdir)/%D%/bison.help >$@.tmp
+	$(AM_V_at)diff -u $@~ $@.tmp || true
+	$(AM_V_at)mv $@.tmp $@
+MAINTAINERCLEANFILES = $(CROSS_OPTIONS_TEXI)
+
+
+# Fix Info's @code in @deftype
+# https://lists.gnu.org/archive/html/help-texinfo/2019-11/msg00004.html
+all: $(srcdir)/$(%C%_bison).info.bak
+$(srcdir)/$(%C%_bison).info.bak: $(srcdir)/$(%C%_bison).info
+	$(AM_V_GEN) $(PERL) -pi.bak -0777	\
+	  -e 's{(^ --.*\n(?: {10}.*\n)*)}'	\
+	  -e '{'				\
+	  -e '  $$def = $$1;'			\
+	  -e '  $$def =~ s/‘|’//g;'		\
+	  -e '  $$def;'				\
+	  -e '}gem;' $(srcdir)/$(%C%_bison).info
+	@ touch $@
+EXTRA_DIST += $(srcdir)/$(%C%_bison).info.bak
+MAINTAINERCLEANFILES += $(srcdir)/$(%C%_bison).info.bak
+
+
+## ---------- ##
+## Ref card.  ##
+## ---------- ##
+
+EXTRA_DIST += %D%/refcard.tex
+CLEANFILES += %D%/refcard.pdf
+
+%D%/refcard.pdf: %D%/refcard.tex
+	$(AM_V_GEN) cd %D% && pdftex $(abs_top_srcdir)/%D%/refcard.tex
+
+
+
+## ---------------- ##
+## %D%/bison.help.  ##
+## ---------------- ##
+
+# Some of our targets (cross-options.texi, bison.1) use "bison --help".
+# Since we want to ship the generated file to avoid additional
+# requirements over the user environment, we used to not depend on
+# src/bison itself, but on src/getargs.c and other files.  Yet, we
+# need "bison --help" to work to make help2man happy, so we used to
+# include "make src/bison" in the commands.  Then we may have a
+# problem with concurrent builds, since one make might be aiming one
+# of its jobs at compiling src/bison, and another job at generating
+# the man page.  If the latter is faster than the former, then we have
+# two makes that concurrently try to compile src/bison.  Doomed to
+# failure.
+#
+# As a simple scheme to get our way out, make a stamp file,
+# bison.help, which contains --version then --help.  This file can
+# depend on bison, which ensures its correctness.  But update it
+# *only* if needed (content changes).  This way, we avoid useless
+# compilations of cross-options.texi and bison.1.  At the cost of
+# repeated builds of bison.help.
+
+EXTRA_DIST += $(top_srcdir)/%D%/bison.help
+if ! CROSS_COMPILING
+MAINTAINERCLEANFILES += $(top_srcdir)/%D%/bison.help
+$(top_srcdir)/%D%/bison.help: src/bison$(EXEEXT)
+	$(AM_V_GEN)$(MKDIR_P) %D%
+	$(AM_V_at) LC_ALL=C tests/bison --version >%D%/bison.help.tmp
+	$(AM_V_at) LC_ALL=C tests/bison --help | \
+## Avoid depending on the path to Bison.
+	  sed -e 's,^Usage: .*/bison \[OPTION\],Usage: bison [OPTION],g' \
+## Avoid variations in the output depending on whether we are
+## on a glibc system.
+	      -e '/translation bugs/d'  >>%D%/bison.help.tmp
+	$(AM_V_at)$(top_srcdir)/build-aux/move-if-change %D%/bison.help.tmp $@
+endif ! CROSS_COMPILING
+
+
+## ----------- ##
+## Man Pages.  ##
+## ----------- ##
+
+dist_man_MANS = $(top_srcdir)/%D%/bison.1
+
+EXTRA_DIST += $(dist_man_MANS:.1=.x)
+MAINTAINERCLEANFILES += $(dist_man_MANS)
+
+# Differences to ignore when comparing the man page (the date).
+remove_time_stamp = \
+  sed 's/^\(\.TH[^"]*"[^"]*"[^"]*\)"[^"]*"/\1/'
+
+# Depend on configure to get version number changes.
+if ! CROSS_COMPILING
+MAN_DEPS = %D%/bison.help %D%/bison.x $(top_srcdir)/configure
+endif
+
+$(top_srcdir)/%D%/bison.1: $(MAN_DEPS)
+	$(AM_V_GEN)$(HELP2MAN)			\
+	    --include=$(top_srcdir)/%D%/bison.x	\
+	    --output=$@.tmp tests/bison
+	$(AM_V_at)if $(remove_time_stamp) $@ >$@a.tmp 2>/dev/null &&		\
+	   $(remove_time_stamp) $@.tmp | cmp $@a.tmp - >/dev/null 2>&1; then	\
+	  touch $@;								\
+	else									\
+	  mv $@.tmp $@;								\
+	fi
+	$(AM_V_at)rm -f $@*.tmp
+
+if ENABLE_YACC
+nodist_man_MANS = %D%/yacc.1
+endif
+
+## ----------------------------- ##
+## Graphviz examples generation. ##
+## ----------------------------- ##
+
+CLEANFILES += $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.svg)
+FIGS_GV =                                               \
+  %D%/figs/example.gv                                   \
+  %D%/figs/example-reduce.gv %D%/figs/example-shift.gv
+EXTRA_DIST +=                                                   \
+  $(FIGS_GV) $(FIGS_GV:.gv=.txt)                                \
+  $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.svg)
+SUFFIXES += .gv .eps .pdf .svg
+
+.gv.eps:
+	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
+	$(AM_V_at) $(DOT) -Gmargin=0 -Teps $< >$@.tmp
+	$(AM_V_at) mv $@.tmp $@
+
+.gv.pdf:
+	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
+	$(AM_V_at) $(DOT) -Gmargin=0 -Tpdf $< >$@.tmp
+	$(AM_V_at) mv $@.tmp $@
+
+.gv.svg:
+	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
+	$(AM_V_at) $(DOT) -Gmargin=0 -Tsvg $< >$@.tmp
+	$(AM_V_at) mv $@.tmp $@
+
+## -------------- ##
+## Doxygenation.  ##
+## -------------- ##
+
+DOXYGEN = doxygen
+
+.PHONY: doc html
+
+doc: html
+
+html-local: %D%/Doxyfile
+	$(AM_V_GEN) $(DOXYGEN) %D%/Doxyfile
+
+edit = sed -e 's,@PACKAGE_NAME\@,$(PACKAGE_NAME),g' \
+	   -e 's,@PACKAGE_VERSION\@,$(PACKAGE_VERSION),g' \
+	   -e 's,@PERL\@,$(PERL),g' \
+	   -e 's,@top_builddir\@,$(top_builddir),g' \
+	   -e 's,@top_srcdir\@,$(top_srcdir),g'
+
+EXTRA_DIST += %D%/Doxyfile.in
+CLEANFILES += %D%/Doxyfile
+# Sed is used to generate Doxyfile from Doxyfile.in instead of
+# configure, because the former is way faster than the latter.
+%D%/Doxyfile: $(top_srcdir)/%D%/Doxyfile.in
+	$(AM_V_GEN) $(edit) $(top_srcdir)/%D%/Doxyfile.in >%D%/Doxyfile
+
+CLEANDIRS += %D%/html

doc/refcard.tex

@@ -19,7 +19,8 @@
 \def\finalout{\overfullrule=0pt}
 %\finalout
 
-% Copyright (c) 1998, 2001, 2009-2012 Free Software Foundation, Inc.
+% Copyright (c) 1998, 2001, 2009--2015, 2018--2020 Free Software
+% Foundation, Inc.
 %
 % This file is part of Bison.
 %
@@ -357,7 +358,7 @@ otherwise it will have the format {\tt {\it name}.tab.h}, where
 
 In the above, {\it t} is a {\it type} defined in the {\tt \%union}
 definition,  {\it n} is a {\it terminal} symbol name, {\it m} is a
-{\it non-terminal} symbol name, and {\it association} can be one of
+{\it nonterminal} symbol name, and {\it association} can be one of
 {\tt \%left}, {\tt \%right}, or {\tt \%nonassoc}.
 
 \vskip .10truein
@@ -400,16 +401,16 @@ Rules take the form:
 
 \vskip -\baselineskip
 \beginexample
-     non-terminal : {\it statement} 1
-                  | {\it statement} 2
-                      \vdots
-                  | {\it statement n}
-                  ;
+     nonterminal : {\it statement} 1
+                 | {\it statement} 2
+                     \vdots
+                 | {\it statement n}
+                 ;
 \endexample
 
 Where {\it statements} can be either empty, or contain
 a mixture of C code (enclosed in {\tt \{...\}}), and the
-symbols that make up the non-terminal. For example:
+symbols that make up the nonterminal. For example:
 
 \vskip -\baselineskip
 \beginexample

etc/.gitignore

@@ -1,3 +1 @@
-/Makefile
-/Makefile.in
 /bench.pl

etc/README

@@ -16,7 +16,7 @@ straightforward use of _build/src/bison would.)
 
 --
 
-Copyright (C) 2006, 2009-2012 Free Software Foundation, Inc.
+Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.