version 3.5.2

* NEWS: Record release date.

.gitignore

@@ -1,8 +1,6 @@
-*.eps
 *.log
 *.o
 *.pdf
-*.png
 *.stamp
 *.trs
 *~

.prev-version

@@ -1 +1 @@
-3.2.1
+3.5.1

.travis.yml

@@ -1,17 +1,68 @@
-# Travis defines and exports CC and CXX *after* we have defined our
+version: ~> 1.0
-# environment variables via 'env'.  So, do not use 'env' to define
-# them.  Instead, put their definitions in MATRIX_EVAL, which we eval
-# after the definitions from Travis.
 
-language: cpp
+# 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
 
-env:
+# Run in two steps:
-  global:
+# 1. Build the tarball
-    # ICC serial number.
+#    On a modern distro, with all the needed dependencies, including the whole git history.
-    secure: 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
+# 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
 
-matrix:
+# 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.  ##
     ## ------- ##
@@ -19,299 +70,399 @@ matrix:
     # Start with three completely different environments, to get
     # errors asap.
 
-    - name: "GCC 7 -O3"
+    - name: "GCC 9 -O3"
+      stage: check
       os: linux
+      dist: bionic
       addons:
         apt:
           sources:
-            - ubuntu-toolchain-r-test
+            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-          packages:
+            - sourceline: 'ppa:ubuntu-toolchain-r/test'
-            - g++-7
+          packages: g++-9
       env:
-        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7 && CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'"
+        - 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 on go.  Run in two parts.
+    # Travis if we run all the tests in one go.  Run in two parts.
-    - name: "Clang 7 libc++ and ASAN part 1"
+    - name: "Clang 9 libc++ and ASAN part 1"
+      stage: check
       os: linux
-      addons:
+      dist: bionic
+      addons: &clang9
         apt:
           sources:
-            - llvm-toolchain-trusty-7
+            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-            - ubuntu-toolchain-r-test
+            - 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-7
+            - clang-9
-            - libc++-7-dev
+            - libc++-9-dev
-            - libc++abi-7-dev
+            - libc++abi-9-dev
       env:
         # Do not use ASAN with ubuntu's libc++: https://bugs.llvm.org/show_bug.cgi?id=17379
-        - MATRIX_EVAL="PART=1 CC='clang-7 -fsanitize=address' CXX='clang++-7 -fsanitize=address -stdlib=libc++'"
+        - CC='clang-9 -fsanitize=address'
+        - CXX='clang++-9 -fsanitize=address -stdlib=libc++'
+        - PART=1
 
-    - name: "Clang 7 libc++ and ASAN part 2"
+    - name: "Clang 9 libc++ and ASAN part 2"
+      stage: check
       os: linux
-      addons:
+      dist: bionic
-        apt:
+      addons: *clang9
-          sources:
-            - llvm-toolchain-trusty-7
-            - ubuntu-toolchain-r-test
-          packages:
-            - clang-7
-            - libc++-7-dev
-            - libc++abi-7-dev
       env:
         # Do not use ASAN with ubuntu's libc++: https://bugs.llvm.org/show_bug.cgi?id=17379
-        - MATRIX_EVAL="PART=2 CC='clang-7 -fsanitize=address' CXX='clang++-7 -fsanitize=address -stdlib=libc++'"
+        - CC='clang-9 -fsanitize=address'
+        - CXX='clang++-9 -fsanitize=address -stdlib=libc++'
+        - PART=2
 
     - name: "ICC"
+      stage: check
       os: linux
+      compiler: icc
       env:
-        # ICC's warnings are often very wrong (e.g., it thinks foo ?
+        - CC=icc
-        # "bar" : "baz" is char* instead of const char*), so don't try
+        - CXX=icpc
-        # to work around the, and obviously, don't die on them.
+      install:
-        - MATRIX_EVAL="CC=icc && CXX=icpc"
+        - source /opt/intel/inteloneapi/compiler/latest/env/vars.sh
-        - MAKE_ARGS='WERROR_CFLAGS= WERROR_CXXFLAGS='
+      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
 
     ## ----- ##
     ## GCC.  ##
     ## ----- ##
 
-    #- name: "GCC 8 with sanitizers"
+    - name: "GCC 8 with sanitizers part 1"
-    #  os: linux
+      os: linux
-    #  addons:
+      dist: bionic
-    #    apt:
+      addons:
-    #      sources:
+        apt:
-    #        - ubuntu-toolchain-r-test
+          packages: g++-8
-    #      packages:
+      env:
-    #        - g++-8
+        - CC='gcc-8 -fsanitize=undefined,address -fno-omit-frame-pointer'
-    #  env:
+        - CXX='g++-8 -fsanitize=undefined,address -fno-omit-frame-pointer'
-    #    # Can't use UBSAN: I get:
+        - CONFIGUREFLAGS='CFLAGS=-O1 CXXFLAGS=-O1'
-    #    # configure:4951: gcc-8 -fsanitize=undefined,address -fno-omit-frame-pointer conftest.c
+        - PART=1
-    #    # /usr/bin/ld: unrecognized option '--push-state'
+
-    #    - MATRIX_EVAL="CC='gcc-8 -fsanitize=undefined,address -fno-omit-frame-pointer' CXX='g++-8 -fsanitize=undefined,address -fno-omit-frame-pointer'"
+    - 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:
+          sources: ubuntu-toolchain-r-test
-            - ubuntu-toolchain-r-test
+          packages: g++-6
-          packages:
-            - g++-6
       env:
-        - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
+        - CC=gcc-6
+        - CXX=g++-6
 
     - name: "GCC 5"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: ubuntu-toolchain-r-test
-            - ubuntu-toolchain-r-test
+          packages: g++-5
-          packages:
-            - g++-5
       env:
-         - MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"
+         - CC=gcc-5
+         - CXX=g++-5
 
     - name: "GCC 4.9"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: ubuntu-toolchain-r-test
-            - ubuntu-toolchain-r-test
+          packages: g++-4.9
-          packages:
-            - g++-4.9
       env:
-         - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
+         - CC=gcc-4.9
+         - CXX=g++-4.9
 
     - name: "GCC 4.8"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: ubuntu-toolchain-r-test
-            - ubuntu-toolchain-r-test
+          packages: g++-4.8
-          packages:
-            - g++-4.8
       env:
-         - MATRIX_EVAL="CC=gcc-4.8 && CXX=g++-4.8"
+         - CC=gcc-4.8
+         - CXX=g++-4.8
 
     - name: "GCC 4.7"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: ubuntu-toolchain-r-test
-            - ubuntu-toolchain-r-test
+          packages: g++-4.7
-          packages:
-            - g++-4.7
       env:
-         - MATRIX_EVAL="CC=gcc-4.7 && CXX=g++-4.7"
+         - CC=gcc-4.7
+         - CXX=g++-4.7
 
     - name: "GCC 4.6"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: ubuntu-toolchain-r-test
-            - ubuntu-toolchain-r-test
+          packages: g++-4.6
-          packages:
-            - g++-4.6
       env:
-         - MATRIX_EVAL="CC=gcc-4.6 && CXX=g++-4.6"
+         - CC=gcc-4.6
+         - CXX=g++-4.6
 
     ## ------- ##
     ## Clang.  ##
     ## ------- ##
 
-    - name: "Clang 6 -O3 and libc++"
+    - 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-trusty-6.0
+            - llvm-toolchain-xenial-6.0
             - ubuntu-toolchain-r-test
           packages:
             - clang-6.0
             - libc++-dev
       env:
-        - MATRIX_EVAL="CC=clang-6.0 && CXX='clang++-6.0 -stdlib=libc++'"
+        - CC=clang-6.0
-        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
+        - CXX='clang++-6.0 -stdlib=libc++'
 
     - name: "Clang 5"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: llvm-toolchain-xenial-5.0
-            - llvm-toolchain-trusty-5.0
           packages:
             - clang-5.0
             - libc++-dev
       env:
-        - MATRIX_EVAL="CC='clang-5.0' CXX='clang++-5.0'"
+        - CC='clang-5.0'
+        - CXX='clang++-5.0'
 
     - name: "Clang 4"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: llvm-toolchain-xenial-4.0
-            - llvm-toolchain-trusty-4.0
+          packages: clang-4.0
-          packages:
-            - clang-4.0
       env:
-        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"
+        - CC=clang-4.0
+        - CXX=clang++-4.0
 
     - name: "Clang 3.9"
+      stage: check
       os: linux
+      dist: xenial
       addons:
         apt:
-          sources:
+          sources: llvm-toolchain-xenial-3.9
-            - llvm-toolchain-trusty-3.9
+          packages: clang-3.9
-          packages:
-            - clang-3.9
       env:
-        - MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9"
+        - 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:
+          packages: clang-3.8
-            - clang-3.8
       env:
-        - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"
+        - 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:
+          packages: clang-3.7
-            - clang-3.7
       env:
-        - MATRIX_EVAL="CC=clang-3.7 && CXX=clang++-3.7"
+        - 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:
+          packages: clang-3.6
-            - clang-3.6
       env:
-        - MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6"
+        - 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:
+          packages: clang-3.5
-            - clang-3.5
       env:
-        - MATRIX_EVAL="CC=clang-3.5 && CXX=clang++-3.5"
+        - 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:
+          packages: clang-3.4
-            - clang-3.4
       env:
         # No versioned name installed, but beware that Travis installs
         # a more modern clang earlier in the default PATH.
-        - MATRIX_EVAL='CC=/usr/bin/clang && CXX=/usr/bin/clang++'
+        - 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:
+          packages: clang-3.3
-            - clang-3.3
       env:
         # See comment for 3.4.
-        - MATRIX_EVAL='CC=/usr/bin/clang && CXX=/usr/bin/clang++'
+        - 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)
 
-before_install:
-  - eval "$MATRIX_EVAL"
-  - env
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq autoconf automake autopoint doxygen flex gettext graphviz help2man m4 texinfo
-  - if [[ $CC == "icc" ]]; then build-aux/install-icc.sh; fi
-  - if [[ -f ~/.bashrc ]]; then source ~/.bashrc; fi
-  - autoconf --version
-  - automake --version
-  - autopoint --version
   - $CC --version
   - $CXX --version
+  - dmd --version
   - doxygen --version
   - flex --version
-  - gettext --version
+  - ld --version
-  - dot -V
-  - help2man --version
   - m4 --version
-  - makeinfo --version
 
-script:
-  - git show
-  - git tag -l
-  # For some reasons, sometimes the checkout does not have any tags,
-  # so `git describe` fails, so bootstrap fails.
-  - git describe || git tag v3.0 -m "Fake version 3.0."
-  - git describe
-  - ./bootstrap
   - if [[ -f ~/.bashrc ]]; then source ~/.bashrc; fi
-  - ./configure --enable-gcc-warnings CC="$CC" CXX="$CXX" $CONFIGUREFLAGS || { cat config.log && false; }
+  # Unset this variable, otherwise, Java programs' stderr is cluttered
-  - make -j2 $MAKE_ARGS
+  # with `Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m`, which makes
-  - if test ${PART-1} = 1; then make check                  VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat tests/testsuite.log && false; }; fi
+  # the test suite fail.
-  - if test ${PART-1} = 1; then make maintainer-check-posix VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat tests/testsuite.log && false; }; fi
+  - unset _JAVA_OPTIONS
-  - if test ${PART-2} = 2; then make maintainer-check-g++   VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat tests/testsuite.log && false; }; fi
 
-after_script:
+  # Fail fast from now on.
-  - if [[ $CC == "icc" ]]; then uninstall_intel_software; fi
+  - set -e
+  - sftp [email protected]:bison-$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) 1998-2015, 2018 Free Software Foundation, Inc.
+Copyright (C) 1998-2015, 2018-2020 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 

ChangeLog-2012

@@ -26733,7 +26733,7 @@
 
 	-----
 
-	Copyright (C) 1987-1988, 1991-2015, 2018 Free Software
+	Copyright (C) 1987-1988, 1991-2015, 2018-2020 Free Software
 	Foundation, Inc.
 
 	Copying and distribution of this file, with or without

Makefile.am

@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in.
 
-# Copyright (C) 2001-2015, 2018 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
@@ -18,7 +18,7 @@
 AUTOMAKE_OPTIONS = subdir-objects
 ACLOCAL_AMFLAGS = -I m4
 
-SUBDIRS = po runtime-po .
+SUBDIRS = po runtime-po gnulib-po .
 
 # Files installed for use by Automake.
 aclocaldir = @aclocaldir@
@@ -29,13 +29,21 @@ EXTRA_DIST = .prev-version .version cfg.mk PACKAGING \
 
 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 = -d -v -Werror -Wall -Wno-yacc --report=all
+AM_YFLAGS_WITH_LINES = --defines -Werror -Wall --report=all
+AM_YFLAGS = $(AM_YFLAGS_WITH_LINES) --no-lines
 
 # Initialization before completion by local.mk's.
 AM_CFLAGS = $(WARN_CFLAGS)
@@ -52,12 +60,12 @@ MOSTLYCLEANFILES =
 SUFFIXES =
 TESTS = $(dist_TESTS)
 check_PROGRAMS =
+check_SCRIPTS =
 dist_TESTS =
 noinst_LIBRARIES =
 
 include build-aux/local.mk
 include data/local.mk
-include djgpp/local.mk
 include doc/local.mk
 include etc/local.mk
 include examples/local.mk
@@ -80,9 +88,22 @@ clean-local:
 BUILT_SOURCES += $(top_srcdir)/.version
 $(top_srcdir)/.version: configure
 	echo $(VERSION) > $@-t && mv $@-t $@
-dist-hook: gen-ChangeLog
+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 $(srcdir)/data -type f          \

NEWS

@@ -1,5 +1,736 @@
 GNU Bison NEWS
 
+* Noteworthy changes in release 3.5.2 (2020-02-13) [stable]
+
+** Bug fixes
+
+  Portability issues and minor cosmetic issues.
+
+  The lalr1.cc skeleton properly rejects unsupported values for parse.lac
+  (as yacc.c does).
+
+* Noteworthy changes in release 3.5.1 (2020-01-19) [stable]
+
+** Bug fixes
+
+  Portability fixes.
+
+  Fix compiler warnings.
+
+* Noteworthy changes in release 3.5 (2019-12-11) [stable]
+
+** Backward incompatible changes
+
+  Lone carriage-return characters (aka \r or ^M) in the grammar files are no
+  longer treated as end-of-lines.  This changes the diagnostics, and in
+  particular their locations.
+
+  In C++, line numbers and columns are now represented as 'int' not
+  'unsigned', so that integer overflow on positions is easily checkable via
+  'gcc -fsanitize=undefined' and the like.  This affects the API for
+  positions.  The default position and location classes now expose
+  'counter_type' (int), used to define line and column numbers.
+
+** Deprecated features
+
+  The YYPRINT macro, which works only with yacc.c and only for tokens, was
+  obsoleted long ago by %printer, introduced in Bison 1.50 (November 2002).
+  It is deprecated and its support will be removed eventually.
+
+** New features
+
+*** Lookahead correction in C++
+
+  Contributed by Adrian Vogelsgesang.
+
+  The C++ deterministic skeleton (lalr1.cc) now supports LAC, via the
+  %define variable parse.lac.
+
+*** Variable api.token.raw: Optimized token numbers (all skeletons)
+
+  In the generated parsers, tokens have two numbers: the "external" token
+  number as returned by yylex (which starts at 257), and the "internal"
+  symbol number (which starts at 3).  Each time yylex is called, a table
+  lookup maps the external token number to the internal symbol number.
+
+  When the %define variable api.token.raw is set, tokens are assigned their
+  internal number, which saves one table lookup per token, and also saves
+  the generation of the mapping table.
+
+  The gain is typically moderate, but in extreme cases (very simple user
+  actions), a 10% improvement can be observed.
+
+*** Generated parsers use better types for states
+
+  Stacks now use the best integral type for state numbers, instead of always
+  using 15 bits.  As a result "small" parsers now have a smaller memory
+  footprint (they use 8 bits), and there is support for large automata (16
+  bits), and extra large (using int, i.e., typically 31 bits).
+
+*** Generated parsers prefer signed integer types
+
+  Bison skeletons now prefer signed to unsigned integer types when either
+  will do, as the signed types are less error-prone and allow for better
+  checking with 'gcc -fsanitize=undefined'.  Also, the types chosen are now
+  portable to unusual machines where char, short and int are all the same
+  width.  On non-GNU platforms this may entail including <limits.h> and (if
+  available) <stdint.h> to define integer types and constants.
+
+*** A skeleton for the D programming language
+
+  For the last few releases, Bison has shipped a stealth experimental
+  skeleton: lalr1.d.  It was first contributed by Oliver Mangold, based on
+  Paolo Bonzini's lalr1.java, and was cleaned and improved thanks to
+  H. S. Teoh.
+
+  However, because nobody has committed to improving, testing, and
+  documenting this skeleton, it is not clear that it will be supported in
+  the future.
+
+  The lalr1.d skeleton *is functional*, and works well, as demonstrated in
+  examples/d/calc.d.  Please try it, enjoy it, and... commit to support it.
+
+*** Debug traces in Java
+
+  The Java backend no longer emits code and data for parser tracing if the
+  %define variable parse.trace is not defined.
+
+** Diagnostics
+
+*** New diagnostic: -Wdangling-alias
+
+  String literals, which allow for better error messages, are (too)
+  liberally accepted by Bison, which might result in silent errors.  For
+  instance
+
+    %type <exVal> cond "condition"
+
+  does not define "condition" as a string alias to 'cond' (nonterminal
+  symbols do not have string aliases).  It is rather equivalent to
+
+    %nterm <exVal> cond
+    %token <exVal> "condition"
+
+  i.e., it gives the type 'exVal' to the "condition" token, which was
+  clearly not the intention.
+
+  Also, because string aliases need not be defined, typos such as "baz"
+  instead of "bar" will be not reported.
+
+  The option -Wdangling-alias catches these situations.  On
+
+    %token BAR "bar"
+    %type <ival> foo "foo"
+    %%
+    foo: "baz" {}
+
+  bison -Wdangling-alias reports
+
+    warning: string literal not attached to a symbol
+          | %type <ival> foo "foo"
+          |                  ^~~~~
+    warning: string literal not attached to a symbol
+          | foo: "baz" {}
+          |      ^~~~~
+
+   The -Wall option does not (yet?) include -Wdangling-alias.
+
+*** Better POSIX Yacc compatibility diagnostics
+
+  POSIX Yacc restricts %type to nonterminals.  This is now diagnosed by
+  -Wyacc.
+
+    %token TOKEN1
+    %type  <ival> TOKEN1 TOKEN2 't'
+    %token TOKEN2
+    %%
+    expr:
+
+  gives with -Wyacc
+
+    input.y:2.15-20: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
+        2 | %type  <ival> TOKEN1 TOKEN2 't'
+          |               ^~~~~~
+    input.y:2.29-31: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
+        2 | %type  <ival> TOKEN1 TOKEN2 't'
+          |                             ^~~
+    input.y:2.22-27: warning: POSIX yacc reserves %type to nonterminals [-Wyacc]
+        2 | %type  <ival> TOKEN1 TOKEN2 't'
+          |                      ^~~~~~
+
+*** Diagnostics with insertion
+
+  The diagnostics now display the suggestion below the underlined source.
+  Replacement for undeclared symbols are now also suggested.
+
+    $ cat /tmp/foo.y
+    %%
+    list: lis '.' |
+
+    $ bison -Wall foo.y
+    foo.y:2.7-9: error: symbol 'lis' is used, but is not defined as a token and has no rules; did you mean 'list'?
+        2 | list: lis '.' |
+          |       ^~~
+          |       list
+    foo.y:2.16: warning: empty rule without %empty [-Wempty-rule]
+        2 | list: lis '.' |
+          |                ^
+          |                %empty
+    foo.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
+
+*** Diagnostics about long lines
+
+  Quoted sources may now be truncated to fit the screen.  For instance, on a
+  30-column wide terminal:
+
+    $ cat foo.y
+    %token FOO                       FOO                         FOO
+    %%
+    exp: FOO
+    $ bison foo.y
+    foo.y:1.34-36: warning: symbol FOO redeclared [-Wother]
+        1 | …         FOO                  …
+          |           ^~~
+    foo.y:1.8-10:      previous declaration
+        1 | %token FOO                     …
+          |        ^~~
+    foo.y:1.62-64: warning: symbol FOO redeclared [-Wother]
+        1 | …         FOO
+          |           ^~~
+    foo.y:1.8-10:      previous declaration
+        1 | %token FOO                     …
+          |        ^~~
+
+** Changes
+
+*** Debugging glr.c and glr.cc
+
+  The glr.c skeleton always had asserts to check its own behavior (not the
+  user's).  These assertions are now under the control of the parse.assert
+  %define variable (disabled by default).
+
+*** Clean up
+
+  Several new compiler warnings in the generated output have been avoided.
+  Some unused features are no longer emitted.  Cleaner generated code in
+  general.
+
+** Bug Fixes
+
+  Portability issues in the test suite.
+
+  In theory, parsers using %nonassoc could crash when reporting verbose
+  error messages. This unlikely bug has been fixed.
+
+  In Java, %define api.prefix was ignored.  It now behaves as expected.
+
+* Noteworthy changes in release 3.4.2 (2019-09-12) [stable]
+
+** Bug fixes
+
+  In some cases, when warnings are disabled, bison could emit tons of white
+  spaces as diagnostics.
+
+  When running out of memory, bison could crash (found by fuzzing).
+
+  When defining twice the EOF token, bison would crash.
+
+  New warnings from recent compilers have been addressed in the generated
+  parsers (yacc.c, glr.c, glr.cc).
+
+  When lone carriage-return characters appeared in the input file,
+  diagnostics could hang forever.
+
+* Noteworthy changes in release 3.4.1 (2019-05-22) [stable]
+
+** Bug fixes
+
+  Portability fixes.
+
+* Noteworthy changes in release 3.4 (2019-05-19) [stable]
+
+** Deprecated features
+
+  The %pure-parser directive is deprecated in favor of '%define api.pure'
+  since Bison 2.3b (2008-05-27), but no warning was issued; there is one
+  now.  Note that since Bison 2.7 you are strongly encouraged to use
+  '%define api.pure full' instead of '%define api.pure'.
+
+** New features
+
+*** Colored diagnostics
+
+  As an experimental feature, diagnostics are now colored, controlled by the
+  new options --color and --style.
+
+  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/gnu/gettext/libtextstyle-0.8.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 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".
+
+*** Disabling output
+
+  When given -fsyntax-only, the diagnostics are reported, but no output is
+  generated.
+
+  The name of this option is somewhat misleading as bison does more than
+  just checking the syntax: every stage is run (including checking for
+  conflicts for instance), except the generation of the output files.
+
+*** Include the generated header (yacc.c)
+
+  Before, when --defines is used, bison generated a header, and pasted an
+  exact copy of it into the generated parser implementation file.  If the
+  header name is not "y.tab.h", it is now #included instead of being
+  duplicated.
+
+  To use an '#include' even if the header name is "y.tab.h" (which is what
+  happens with --yacc, or when using the Autotools' ylwrap), define
+  api.header.include to the exact argument to pass to #include.  For
+  instance:
+
+    %define api.header.include {"parse.h"}
+
+  or
+
+    %define api.header.include {<parser/parse.h>}
+
+*** api.location.type is now supported in C (yacc.c, glr.c)
+
+  The %define variable api.location.type defines the name of the type to use
+  for locations.  When defined, Bison no longer defines YYLTYPE.
+
+  This can be used in programs with several parsers to factor their
+  definition of locations: let one of them generate them, and the others
+  just use them.
+
+** Changes
+
+*** Graphviz output
+
+  In conformance with the recommendations of the Graphviz team, if %require
+  "3.4" (or better) is specified, the option --graph generates a *.gv file
+  by default, instead of *.dot.
+
+*** Diagnostics overhaul
+
+  Column numbers were wrong with multibyte characters, which would also
+  result in skewed diagnostics with carets.  Beside, because we were
+  indenting the quoted source with a single space, lines with tab characters
+  were incorrectly underlined.
+
+  To address these issues, and to be clearer, Bison now issues diagnostics
+  as GCC9 does.  For instance it used to display (there's a tab before the
+  opening brace):
+
+    foo.y:3.37-38: error: $2 of ‘expr’ has no declared type
+     expr: expr '+' "number"        { $$ = $1 + $2; }
+                                         ^~
+  It now reports
+
+    foo.y:3.37-38: error: $2 of ‘expr’ has no declared type
+        3 | expr: expr '+' "number" { $$ = $1 + $2; }
+          |                                     ^~
+
+  Other constructs now also have better locations, resulting in more precise
+  diagnostics.
+
+*** Fix-it hints for %empty
+
+  Running Bison with -Wempty-rules and --update will remove incorrect %empty
+  annotations, and add the missing ones.
+
+*** Generated reports
+
+  The format of the reports (parse.output) was improved for readability.
+
+*** Better support for --no-line.
+
+  When --no-line is used, the generated files are now cleaner: no lines are
+  generated instead of empty lines.  Together with using api.header.include,
+  that should help people saving the generated files into version control
+  systems get smaller diffs.
+
+** Documentation
+
+  A new example in C shows an simple infix calculator with a hand-written
+  scanner (examples/c/calc).
+
+  A new example in C shows a reentrant parser (capable of recursive calls)
+  built with Flex and Bison (examples/c/reccalc).
+
+  There is a new section about the history of Yaccs and Bison.
+
+** Bug fixes
+
+  A few obscure bugs were fixed, including the second oldest (known) bug in
+  Bison: it was there when Bison was entered in the RCS version control
+  system, in December 1987.  See the NEWS of Bison 3.3 for the previous
+  oldest bug.
+
+* Noteworthy changes in release 3.3.2 (2019-02-03) [stable]
+
+** Bug fixes
+
+  Bison 3.3 failed to generate parsers for grammars with unused nonterminal
+  symbols.
+
+* Noteworthy changes in release 3.3.1 (2019-01-27) [stable]
+
+** Changes
+
+  The option -y/--yacc used to imply -Werror=yacc, which turns uses of Bison
+  extensions into errors.  It now makes them simple warnings (-Wyacc).
+
+* Noteworthy changes in release 3.3 (2019-01-26) [stable]
+
+  A new mailing list was created, Bison Announce.  It is low traffic, and is
+  only about announcing new releases and important messages (e.g., polls
+  about major decisions to make).
+
+  https://lists.gnu.org/mailman/listinfo/bison-announce
+
+** Backward incompatible changes
+
+  Support for DJGPP, which has been unmaintained and untested for years, is
+  removed.
+
+** Deprecated features
+
+  A new feature, --update (see below) helps adjusting existing grammars to
+  deprecations.
+
+*** Deprecated directives
+
+  The %error-verbose directive is deprecated in favor of '%define
+  parse.error verbose' since Bison 3.0, but no warning was issued.
+
+  The '%name-prefix "xx"' directive is deprecated in favor of '%define
+  api.prefix {xx}' since Bison 3.0, but no warning was issued.  These
+  directives are slightly different, you might need to adjust your code.
+  %name-prefix renames only symbols with external linkage, while api.prefix
+  also renames types and macros, including YYDEBUG, YYTOKENTYPE,
+  yytokentype, YYSTYPE, YYLTYPE, etc.
+
+  Users of Flex that move from '%name-prefix "xx"' to '%define api.prefix
+  {xx}' will typically have to update YY_DECL from
+
+    #define YY_DECL int xxlex (YYSTYPE *yylval, YYLTYPE *yylloc)
+
+  to
+
+    #define YY_DECL int xxlex (XXSTYPE *yylval, XXLTYPE *yylloc)
+
+*** Deprecated %define variable names
+
+  The following variables, mostly related to parsers in Java, have been
+  renamed for consistency.  Backward compatibility is ensured, but upgrading
+  is recommended.
+
+    abstract           -> api.parser.abstract
+    annotations        -> api.parser.annotations
+    extends            -> api.parser.extends
+    final              -> api.parser.final
+    implements         -> api.parser.implements
+    parser_class_name  -> api.parser.class
+    public             -> api.parser.public
+    strictfp           -> api.parser.strictfp
+
+** New features
+
+*** Generation of fix-its for IDEs/Editors
+
+  When given the new option -ffixit (aka -fdiagnostics-parseable-fixits),
+  bison now generates machine readable editing instructions to fix some
+  issues.  Currently, this is mostly limited to updating deprecated
+  directives and removing duplicates.  For instance:
+
+    $ cat foo.y
+    %error-verbose
+    %define parser_class_name "Parser"
+    %define api.parser.class "Parser"
+    %%
+    exp:;
+
+  See the "fix-it:" lines below:
+
+    $ bison -ffixit foo.y
+    foo.y:1.1-14: warning: deprecated directive, use '%define parse.error verbose' [-Wdeprecated]
+     %error-verbose
+     ^~~~~~~~~~~~~~
+    fix-it:"foo.y":{1:1-1:15}:"%define parse.error verbose"
+    foo.y:2.1-34: warning: deprecated directive, use '%define api.parser.class {Parser}' [-Wdeprecated]
+     %define parser_class_name "Parser"
+     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    fix-it:"foo.y":{2:1-2:35}:"%define api.parser.class {Parser}"
+    foo.y:3.1-33: error: %define variable 'api.parser.class' redefined
+     %define api.parser.class "Parser"
+     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    foo.y:2.1-34:     previous definition
+     %define parser_class_name "Parser"
+     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    fix-it:"foo.y":{3:1-3:34}:""
+    foo.y: warning: fix-its can be applied.  Rerun with option '--update'. [-Wother]
+
+  This uses the same output format as GCC and Clang.
+
+*** Updating grammar files
+
+  Fixes can be applied on the fly.  The previous example ends with the
+  suggestion to re-run bison with the option -u/--update, which results in a
+  cleaner grammar file.
+
+    $ bison --update foo.y
+    [...]
+    bison: file 'foo.y' was updated (backup: 'foo.y~')
+
+    $ cat foo.y
+    %define parse.error verbose
+    %define api.parser.class {Parser}
+    %%
+    exp:;
+
+*** Bison is now relocatable
+
+  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 symbolic links to the installed and moved
+  programs, and invoke them through the symbolic link.
+
+*** %expect and %expect-rr modifiers on individual rules
+
+  One can now document (and check) which rules participate in shift/reduce
+  and reduce/reduce conflicts.  This is particularly important GLR parsers,
+  where conflicts are a normal occurrence.  For example,
+
+      %glr-parser
+      %expect 1
+      %%
+
+      ...
+
+      argument_list:
+        arguments %expect 1
+      | arguments ','
+      | %empty
+      ;
+
+      arguments:
+        expression
+      | argument_list ',' expression
+      ;
+
+      ...
+
+  Looking at the output from -v, one can see that the shift-reduce conflict
+  here is due to the fact that the parser does not know whether to reduce
+  arguments to argument_list until it sees the token _after_ the following
+  ','.  By marking the rule with %expect 1 (because there is a conflict in
+  one state), we document the source of the 1 overall shift-reduce conflict.
+
+  In GLR parsers, we can use %expect-rr in a rule for reduce/reduce
+  conflicts.  In this case, we mark each of the conflicting rules.  For
+  example,
+
+      %glr-parser
+      %expect-rr 1
+
+      %%
+
+      stmt:
+        target_list '=' expr ';'
+      | expr_list ';'
+      ;
+
+      target_list:
+        target
+      | target ',' target_list
+      ;
+
+      target:
+        ID %expect-rr 1
+      ;
+
+      expr_list:
+        expr
+      | expr ',' expr_list
+      ;
+
+      expr:
+        ID %expect-rr 1
+      | ...
+      ;
+
+  In a statement such as
+
+      x, y = 3, 4;
+
+  the parser must reduce x to a target or an expr, but does not know which
+  until it sees the '='.  So we notate the two possible reductions to
+  indicate that each conflicts in one rule.
+
+  This feature needs user feedback, and might evolve in the future.
+
+*** C++: Actual token constructors
+
+  When variants and token constructors are enabled, in addition to the
+  type-safe named token constructors (make_ID, make_INT, etc.), we now
+  generate genuine constructors for symbol_type.
+
+  For instance with these declarations
+
+    %token           ':'
+       <std::string> ID
+       <int>         INT;
+
+  you may use these constructors:
+
+    symbol_type (int token, const std::string&);
+    symbol_type (int token, const int&);
+    symbol_type (int token);
+
+  Correct matching between token types and value types is checked via
+  'assert'; for instance, 'symbol_type (ID, 42)' would abort.  Named
+  constructors are preferable, as they offer better type safety (for
+  instance 'make_ID (42)' would not even compile), but symbol_type
+  constructors may help when token types are discovered at run-time, e.g.,
+
+     [a-z]+   {
+                if (auto i = lookup_keyword (yytext))
+                  return yy::parser::symbol_type (i);
+                else
+                  return yy::parser::make_ID (yytext);
+              }
+
+*** C++: Variadic emplace
+
+  If your application requires C++11 and you don't use symbol constructors,
+  you may now use a variadic emplace for semantic values:
+
+    %define api.value.type variant
+    %token <std::pair<int, int>> PAIR
+
+  in your scanner:
+
+    int yylex (parser::semantic_type *lvalp)
+    {
+      lvalp->emplace <std::pair<int, int>> (1, 2);
+      return parser::token::PAIR;
+    }
+
+*** C++: Syntax error exceptions in GLR
+
+  The glr.cc skeleton now supports syntax_error exceptions thrown from user
+  actions, or from the scanner.
+
+*** More POSIX Yacc compatibility warnings
+
+  More Bison specific directives are now reported with -y or -Wyacc.  This
+  change was ready since the release of Bison 3.0 in September 2015.  It was
+  delayed because Autoconf used to define YACC as `bison -y`, which resulted
+  in numerous warnings for Bison users that use the GNU Build System.
+
+  If you still experience that problem, either redefine YACC as `bison -o
+  y.tab.c`, or pass -Wno-yacc to Bison.
+
+*** The tables yyrhs and yyphrs are back
+
+  Because no Bison skeleton uses them, these tables were removed (no longer
+  passed to the skeletons, not even computed) in 2008.  However, some users
+  have expressed interest in being able to use them in their own skeletons.
+
+** Bug fixes
+
+*** Incorrect number of reduce-reduce conflicts
+
+  On a grammar such as
+
+     exp: "num" | "num" | "num"
+
+  bison used to report a single RR conflict, instead of two.  This is now
+  fixed.  This was the oldest (known) bug in Bison: it was there when Bison
+  was entered in the RCS version control system, in December 1987.
+
+  Some grammar files might have to adjust their %expect-rr.
+
+*** Parser directives that were not careful enough
+
+  Passing invalid arguments to %nterm, for instance character literals, used
+  to result in unclear error messages.
+
+** Documentation
+
+  The examples/ directory (installed in .../share/doc/bison/examples) has
+  been restructured per language for clarity.  The examples come with a
+  README and a Makefile.  Not only can they be used to toy with Bison, they
+  can also be starting points for your own grammars.
+
+  There is now a Java example, and a simple example in C based on Flex and
+  Bison (examples/c/lexcalc/).
+
+** Changes
+
+*** Parsers in C++
+
+  They now use noexcept and constexpr.  Please, report missing annotations.
+
+*** Symbol Declarations
+
+  The syntax of the variation directives to declare symbols was overhauled
+  for more consistency, and also better POSIX Yacc compliance (which, for
+  instance, allows "%type" without actually providing a type).  The %nterm
+  directive, supported by Bison since its inception, is now documented and
+  officially supported.
+
+  The syntax is now as follows:
+
+    %token TAG? ( ID NUMBER? STRING? )+ ( TAG ( ID NUMBER? STRING? )+ )*
+    %left  TAG? ( ID NUMBER? )+ ( TAG ( ID NUMBER? )+ )*
+    %type  TAG? ( ID | CHAR | STRING )+ ( TAG ( ID | CHAR | STRING )+ )*
+    %nterm TAG? ID+ ( TAG ID+ )*
+
+  where TAG denotes a type tag such as ‘<ival>’, ID denotes an identifier
+  such as ‘NUM’, NUMBER a decimal or hexadecimal integer such as ‘300’ or
+  ‘0x12d’, CHAR a character literal such as ‘'+'’, and STRING a string
+  literal such as ‘"number"’.  The post-fix quantifiers are ‘?’ (zero or
+  one), ‘*’ (zero or more) and ‘+’ (one or more).
+
+* Noteworthy changes in release 3.2.4 (2018-12-24) [stable]
+
+** Bug fixes
+
+  Fix the move constructor of symbol_type.
+
+  Always provide a copy constructor for symbol_type, even in modern C++.
+
+* Noteworthy changes in release 3.2.3 (2018-12-18) [stable]
+
+** Bug fixes
+
+  Properly support token constructors in C++ with types that include commas
+  (e.g., std::pair<int, int>).  A regression introduced in Bison 3.2.
+
 * Noteworthy changes in release 3.2.2 (2018-11-21) [stable]
 
 ** Bug fixes
@@ -17,7 +748,7 @@ GNU Bison NEWS
 
 ** Backward incompatible changes
 
-  Support for DJGPP, which have been unmaintained and untested for years, is
+  Support for DJGPP, which has been unmaintained and untested for years, is
   obsolete.  Unless there is activity to revive it, it will be removed.
 
 ** Changes
@@ -187,7 +918,7 @@ GNU Bison NEWS
   release of Bison 3.0, five years ago.  Generated parsers do not require a
   C99 compiler.
 
-  Support for DJGPP, which have been unmaintained and untested for years, is
+  Support for DJGPP, which has been unmaintained and untested for years, is
   obsolete. Unless there is activity to revive it, the next release of Bison
   will have it removed.
 
@@ -393,10 +1124,10 @@ GNU Bison NEWS
 
   bison used to report:
 
-    /tmp/foo.yy:2.10-11: error: %printer redeclaration for FOO
+    foo.yy:2.10-11: error: %printer redeclaration for FOO
      %printer {} "foo"
               ^^
-    /tmp/foo.yy:3.10-11:     previous declaration
+    foo.yy:3.10-11:     previous declaration
      %printer {} FOO
               ^^
 
@@ -502,7 +1233,7 @@ GNU Bison NEWS
 
   Traditional Yacc generates 'y.tab.c' whatever the name of the input file.
   Therefore Makefiles written for Yacc expect 'y.tab.c' (and possibly
-  'y.tab.h' and 'y.outout') to be generated from 'foo.y'.
+  'y.tab.h' and 'y.output') to be generated from 'foo.y'.
 
   To this end, for ages, AC_PROG_YACC, Autoconf's macro to look for an
   implementation of Yacc, was using Bison as 'bison -y'.  While it does
@@ -3097,7 +3828,7 @@ Output file does not redefine const for C++.
 
 -----
 
-Copyright (C) 1995-2015, 2018 Free Software Foundation, Inc.
+Copyright (C) 1995-2015, 2018-2020 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Parser Generator.
 
@@ -3138,11 +3869,17 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  LocalWords:  redeclaration sval fcaret reentrant XSLT xsl Wmaybe yyvsp Tedi
  LocalWords:  pragmas noreturn untyped Rozenman unexpanded Wojciech Polak
  LocalWords:  Alexandre MERCHANTABILITY yytype emplace ptr automove lvalues
- LocalWords:  nonterminal yy args Pragma dereference yyformat rhs docdir
+ LocalWords:  nonterminal yy args Pragma dereference yyformat rhs docdir bw
- LocalWords:  Redeclarations rpcalc Autoconf YFLAGS Makefiles outout PROG
+ LocalWords:  Redeclarations rpcalc Autoconf YFLAGS Makefiles PROG DECL num
- LocalWords:  Heimbigner AST src ast Makefile srcdir MinGW
+ LocalWords:  Heimbigner AST src ast Makefile srcdir MinGW xxlex XXSTYPE
+ LocalWords:  XXLTYPE strictfp IDEs ffixit fdiagnostics parseable fixits
+ LocalWords:  Wdeprecated yytext Variadic variadic yyrhs yyphrs RCS README
+ LocalWords:  noexcept constexpr ispell american deprecations backend Teoh
+ LocalWords:  YYPRINT Mangold Bonzini's Wdangling exVal baz checkable gcc
+ LocalWords:  fsanitize Vogelsgesang lis redeclared stdint automata
 
 Local Variables:
+ispell-dictionary: "american"
 mode: outline
 fill-column: 76
 End:

PACKAGING

@@ -36,7 +36,8 @@ to the bison package.
 
 -----
 
-Copyright (C) 2002, 2005, 2009-2015, 2018 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

@@ -1,52 +1,87 @@
 This package contains the GNU Bison parser generator.
 
-* Installation
+# Installation
-** Build
+## Build from git
-See the file INSTALL for generic compilation and installation
+Here are basic installation instructions for a repository checkout:
-instructions.
 
-Bison requires GNU m4 1.4.6 or later.  See:
+    $ git submodule update --init
+    $ ./bootstrap
 
-      https://ftp.gnu.org/gnu/m4/m4-1.4.6.tar.gz
+then proceed with the usual `configure && make` steps.
 
-** Internationalization
+The file README-hacking.md is about building, modifying and checking Bison.
+
+## 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.
+
+## 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/gnu/gettext/libtextstyle-0.8.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
+maintainer-side parser generation), and one for the generated parsers (i.e.,
-(i.e., for the user-side parser execution).  The requirements between
+for the user-side parser execution).  The requirements between both differ:
-both differ: bison needs ngettext, the generated parsers do not.  To
+bison needs ngettext, the generated parsers do not.  To simplify the build
-simplify the build system, neither are installed if ngettext is not
+system, neither are installed if ngettext is not supported, even if
-supported, even if generated parsers could have been localized.  See
+generated parsers could have been localized.  See
-http://lists.gnu.org/archive/html/bug-bison/2009-08/msg00006.html for
+http://lists.gnu.org/archive/html/bug-bison/2009-08/msg00006.html for more
-more details.
+details.
 
-* Questions
+# Questions
-See the section FAQ in the documentation (doc/bison.info) for
+See the section FAQ in the documentation (doc/bison.info) for frequently
-frequently asked questions.  The documentation is also available in
+asked questions.  The documentation is also available in PDF and HTML,
-PDF and HTML, provided you have a recent version of Texinfo installed:
+provided you have a recent version of Texinfo installed: run `make pdf` or
-run "make pdf" or "make html".
+`make html`.
 
-If you have questions about using Bison and the documentation does
+If you have questions about using Bison and the documentation does not
-not answer them, please send mail to <[email protected]>.
+answer them, please send mail to <[email protected]>.
 
-* Bug reports
+# 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
+version number from `bison --version`, and a complete, self-contained test
 case in each bug report.
 
-* Copyright statements
+# Copyright statements
-For any copyright year range specified as YYYY-ZZZZ in this package,
+For any copyright year range specified as YYYY-ZZZZ in this package, note
-note that the range specifies every single year in that closed interval.
+that the range specifies every single year in that closed interval.
 
------
+<!--
 
-Local Variables:
+Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2020 Free
-mode: outline
+Software Foundation, Inc.
-fill-column: 76
-ispell-dictionary: "american"
-End:
-
-Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018 Free Software
-Foundation, Inc.
 
 This file is part of GNU bison, the GNU Compiler Compiler.
 
@@ -63,5 +98,13 @@ 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:  parsers ngettext Texinfo pdf html YYYY ZZZZ ispell american
+Local Variables:
-# LocalWords:  MERCHANTABILITY
+mode: markdown
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+LocalWords:  parsers ngettext Texinfo pdf html YYYY ZZZZ ispell american
+LocalWords:  MERCHANTABILITY
+
+-->

README-alpha

@@ -12,7 +12,8 @@ the problems you encounter.
 
 -----
 
-Copyright (C) 2002, 2004, 2009-2015, 2018 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.md

@@ -2,20 +2,19 @@ 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/.
-        http://savannah.gnu.org/projects/bison/
 
 
-* Administrivia
+# Administrivia
 
-** If you incorporate a change from somebody on the net:
+## 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.
+## If a change fixes a test, mention the test in the commit message.
 
-** Bug reports
+## 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.
 
@@ -24,18 +23,18 @@ demonstrates the bug.  Then fix the bug, re-run the test suite, and check
 everything in.
 
 
-* Hacking
+# Hacking
 
-** Visible changes
+## Visible changes
 Which include serious bug fixes, must be mentioned in NEWS.
 
-** Translations
+## 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.
 
-** Horizontal tabs
+## Horizontal tabs
 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.
@@ -43,12 +42,12 @@ Also, test cases might need to contain tabs to check that Bison properly
 processes tabs in its input.
 
 
-* Working from the repository
+# Working from the repository
 
-These notes intend to help people working on the checked-out sources.
+These notes intend to help people working on the checked-out sources.  These
-These requirements do not apply when building from a distribution tarball.
+requirements do not apply when building from a distribution tarball.
 
-** Requirements
+## 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
@@ -75,8 +74,8 @@ 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 \
+    sudo apt-get install \
-    autoconf automake autopoint flex graphviz help2man texinfo valgrind
+      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
@@ -89,144 +88,184 @@ 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
+## First checkout
 
-Obviously, if you are reading these notes, you did manage to check out
+Obviously, if you are reading these notes, you did manage to check out this
-this package from the repository.  For the record, you will find all the
+package from the repository.  For the record, you will find all the relevant
-relevant information on:
+information on http://savannah.gnu.org/git/?group=bison.
 
-        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
 
-Bison uses Git submodules: subscriptions to other Git repositories.
+    $ git submodule update --init
-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:
 
-The next step is to get other files needed to build, which are
+    $ ./bootstrap
-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:
+If it fails with missing symbols (e.g., `error: possibly undefined macro:
-AC_PROG_GNU_M4"), you are likely to have forgotten the submodule
+AC_PROG_GNU_M4`), you are likely to have forgotten the submodule
-initialization part.  Otherwise, there you are!  Just
+initialization part.  To recover from it, run `git reset --hard HEAD`, and
+restart with the submodule initialization.  Otherwise, there you are!  Just
 
-        $ ./configure
+    $ ./configure
-        $ make
+    $ make
-        $ make check
+    $ make check
 
-At this point, there should be no difference between your local copy,
+At this point, there should be no difference between your local copy, and
-and the master copy:
+the master copy:
 
-        $ git diff
+    $ git diff
 
 should output no difference.
 
 Enjoy!
 
-** Updating
+## Updating
 
-The use of submodules make things somewhat different because git does
+If you have git at version 1.8.2 or later, the command
-not support recursive operations: submodules must be taken care of
-explicitly by the user.
 
-*** Updating Bison
+    $ git submodule update --recursive --remote
 
-If you pull a newer version of a branch, say via "git pull", you might
+will be useful for updating to the latest version of all submodules.
-import requests for updated submodules.  A simple "git diff" will reveal if
+
+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".
+actually requested by the subscriber, run `git submodule update`.
 
-        $ git pull
+    $ git pull
-        $ git submodule update
+    $ git submodule update
 
-*** Updating a submodule
+### 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
+    $ cd gnulib
-        $ git fetch
+    $ git fetch
-        $ git checkout -b master --track origin/master
+    $ git checkout -b master --track origin/master
 
 Make sure Bison can live with that version of gnulib.
 
-        $ cd ..
+    $ cd ..
-        $ ./bootstrap
+    $ ./bootstrap
-        $ make distcheck
+    $ make distcheck
 
 Register your changes.
 
-        $ git checkin ...
+    $ 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:
+release, see the ChangeLog in the latest gnulib snapshot at
-
+http://erislabs.net/ianb/projects/gnulib/.
-        http://erislabs.net/ianb/projects/gnulib/
 
 The Autoconf files we use are currently:
-
+- m4/m4.m4
-        m4/m4.m4
+- lib/m4sugar/m4sugar.m4
-        lib/m4sugar/m4sugar.m4
+- lib/m4sugar/foreach.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
+# Test Suite
 
-** make check
+## make check
-Use liberally.
+Consume without moderation.  It is composed of two kinds of tests: the
+examples, and the main test suite.
 
-** TESTSUITEFLAGS
+### 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`).
 
-To run just the testsuite (not the tests related to the examples), run `make
+### The Main Test Suite
-check-local`.
+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'
+
+    $ 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
+- c++, for c++ parsers
-  - deprec, for tests concerning deprecated constructs.
+- deprec, for tests concerning deprecated constructs.
-  - glr, for glr parsers
+- glr, for glr parsers
-  - java, for java parsers
+- java, for java parsers
-  - report, for automaton dumps
+- 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++'
+
+    $ make check-local TESTSUITEFLAGS='-k c++'
 
 Both can be combined.
 
-** Typical errors
+    $ make check-local TESTSUITEFLAGS='-j8 -k c++'
-If the test suite shows failures such as the following one
 
-  .../bison/lib/getopt.h:196:8: error: redefinition of 'struct option'
+To rerun the tests that failed:
-  /usr/include/getopt.h:54:8: error: previous definition of 'struct option'
 
-it probably means that some file was compiled without
+    $ make recheck -j5
-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.
+#### 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`.
 
-** make maintainer-check-valgrind
+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...
+
+
+## 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
@@ -237,13 +276,13 @@ 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 );
+    --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
+## Release checks
 Try to run the test suite with more severe conditions before a
 release:
 
@@ -255,25 +294,25 @@ release:
   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.
+- Check with `make syntax-check` if there are issues diagnosed by gnulib.
 
-- run "make maintainer-check" which:
+- run `make maintainer-check` which:
-  - runs "valgrind -q bison" to run Bison under Valgrind.
+  - 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
+- 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
+- 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
+- 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.
@@ -281,59 +320,77 @@ release:
 - 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):
 
-* Release Procedure
+    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
 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 the submodules.  See above.
 
-** Update maintainer tools, such as Autoconf.  See above.
+## Update maintainer tools, such as Autoconf.  See above.
 
-** Try to get the *.pot files to the Translation Project at least one
+## 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 '\<_(' *.
+helps: `grep -l '\<_(' *`.
 
-** Tests
+## Tests
 See above.
 
-** Update the foreign files
+## Update the foreign files
-Running "./bootstrap" in the top level should update them all for you.  This
+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
+## 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.
+## 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
+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.
+`PACKAGE_COPYRIGHT_YEAR` in configure.ac.
 
-** Update NEWS, commit and tag.
+## 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,
+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
+we must use `2.5.90`, which has the additional benefit of being properly
-sorted in "git tag -l".
+sorted in `git tag -l`.
 
-** make alpha, beta, or stable
+## make alpha, beta, or stable
 See README-release.
 
-** Upload
+## 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
+### Setup
-You need "gnupg".
+You need `gnupg`.
 
 Make sure your public key has been uploaded at least to keys.gnupg.net.  You
 can upload it with:
@@ -342,103 +399,105 @@ can upload it with:
 
 where F125BDF3 should be replaced with your key ID.
 
-*** Using gnupload
+### Using gnupload
-You need "ncftp".
+You need `ncftp`.
 
-At the end "make stable" (or alpha/beta) will display the procedure to run.
+At the end `make stable` (or alpha/beta) will display the procedure to run.
 Just copy and paste it in your shell.
 
-*** By hand
+### By hand
 
-The generic GNU upload procedure is at:
+The generic GNU upload procedure is at
-
+http://www.gnu.org/prep/maintain/maintain.html#Automated-FTP-Uploads.
-  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
+### make distcheck
-*** gpg -b bison-2.3b.tar.gz
+### gpg -b bison-2.3b.tar.gz
-*** In a file named "bison-2.3b.tar.gz.directive", type:
+### In a file named `bison-2.3b.tar.gz.directive`, type:
 
-      version: 1.1
+    version: 1.1
-      directory: bison
+    directory: bison
-      filename: bison-2.3b.tar.gz
+    filename: bison-2.3b.tar.gz
 
-*** gpg --clearsign bison-2.3b.tar.gz.directive
+### gpg --clearsign bison-2.3b.tar.gz.directive
-*** ftp ftp-upload.gnu.org # Log in as anonymous.
+### ftp ftp-upload.gnu.org # Log in as anonymous.
-*** cd /incoming/alpha # cd /incoming/ftp for full release.
+### 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 # This can take a while.
-*** put bison-2.3b.tar.gz.sig
+### put bison-2.3b.tar.gz.sig
-*** put bison-2.3b.tar.gz.directive.asc
+### put bison-2.3b.tar.gz.directive.asc
-*** Repeat all these steps for bison-2.3b.tar.xz.
+### Repeat all these steps for bison-2.3b.tar.xz.
 
-** Update Bison manual on www.gnu.org.
+## Update Bison manual on www.gnu.org.
 
-*** You need a non-anonymous checkout of the web pages directory.
+The instructions below are obsolete, and left in case one would like to run
+the commands by hand.  Today, one just needs to run
 
-  $ cvs -d YOUR_USERID@cvs.savannah.gnu.org:/web/bison checkout bison
+    $ make web-manual-update
 
-*** Get familiar with the instructions for web page maintainers.
+See README-release.
+
+### You need a non-anonymous checkout of the web pages directory.
+
+    $ cvs -d YOUR_USERID@cvs.savannah.gnu.org:/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.
+### 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
+    $ cd $BISON_CHECKOUT/doc
-  $ make stamp-vti
+    $ make stamp-vti
-  $ ../build-aux/gendocs.sh -o "$BISON_WWW_CHECKOUT/manual" \
+    $ ../build-aux/gendocs.sh -o "$BISON_WWW_CHECKOUT/manual" \
-    bison "Bison - GNU parser generator"
+      bison "Bison - GNU parser generator"
-  $ cd $BISON_WWW_CHECKOUT
+    $ cd $BISON_WWW_CHECKOUT
 
 Verify that the result looks sane.
 
-*** Commit the modified and the new files.
+### Commit the modified and the new files.
 
-*** Remove old 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
+     $ cd manual/html_node
-   $ ls -lt
+     $ 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
+## Announce
-function 'index', once for the table of contents); you can ignore this
+The "make release" command just created a template,
-issue.
+`$HOME/announce-bison-X.Y`.  Otherwise, to generate it, run:
 
-** Announce
+    make RELEASE_TYPE=alpha gpg_key_ID=F125BDF3 announcement
-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 `table` and F125BDF3 should be
-
-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
-(info-gnu@gnu.org, bug-bison@gnu.org, help-bison@gnu.org,
+(info-gnu@gnu.org, bison-announce@gnu.org, bug-bison@gnu.org,
-bison-patches@gnu.org, and coordinator@translationproject.org) is
+help-bison@gnu.org, bison-patches@gnu.org, and
-appropriate for a stable release or a "serious beta".  For any other
+coordinator@translationproject.org) is appropriate for a stable release or a
-release, drop at least info-gnu@gnu.org.  For an example of how to fill out
+"serious beta".  For any other release, drop at least info-gnu@gnu.org.  For
-the rest of the template, search the mailing list archives for the most
+an example of how to fill out the rest of the template, search the mailing
-recent release announcement.
+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 compilers@iecc.com.  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
+## 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):
 
@@ -446,9 +505,10 @@ create a new empty entry in line 3 (without the two leading spaces):
 
 Push these changes.
 
------
+<!--
 
-Copyright (C) 2002-2005, 2007-2015, 2018 Free Software Foundation, Inc.
+Copyright (C) 2002-2005, 2007-2015, 2018-2020 Free Software Foundation,
+Inc.
 
 This file is part of GNU Bison.
 
@@ -465,13 +525,20 @@ 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
+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
+LocalWords:  TESTSUITEFLAGS deprec struct gnulib's getopt config ggdb
+LocalWords:  bitset fsanitize symlink CFLAGS MERCHANTABILITY ispell
+LocalWords:  american
+
+-->

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

@@ -10,6 +10,7 @@ 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]
@@ -18,6 +19,7 @@ Antonio Silva Correia     [email protected]
 Arnold Robbins            [email protected]
 Art Haas                  [email protected]
 Askar Safin               [email protected]
+Balázs Scheidler          [email protected]
 Baron Schwartz            [email protected]
 Ben Pfaff                 [email protected]
 Benoit Perrot             [email protected]
@@ -32,6 +34,7 @@ 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]
@@ -40,6 +43,7 @@ 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]
@@ -54,7 +58,9 @@ Didier Godefroy           [email protected]
 Efi Fogel                 [email protected]
 Enrico Scholz             [email protected]
 Eric Blake                [email protected]
+Eric S. Raymond           [email protected]
 Étienne Renault           [email protected]
+Evan Nemerson             [email protected]
 Evgeny Stambulchik        [email protected]
 Fabrice Bauzac            [email protected]
 Ferdinand Thiessen        [email protected]
@@ -63,6 +69,7 @@ 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]
@@ -73,6 +80,7 @@ Hans Åberg                [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]
@@ -84,15 +92,19 @@ 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]
@@ -113,17 +125,21 @@ 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]
@@ -162,28 +178,39 @@ 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.
@@ -195,7 +222,7 @@ End:
 
 -----
 
-Copyright (C) 2000-2015, 2018 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

@@ -1,7 +1,108 @@
-* Short term
+* Bison 3.6
-** yacc.c
+** doc
-Now that ylwrap is fixed, we should include foo.tab.h from foo.tab.c rather
+I feel its ugly to use the GNU style to declare functions in the doc.  It
-than duplicating it.
+generates tons of white space in the page, and may contribute to bad page
+breaks.
+
+Also, we seem to teach YYPRINT very early on, although it should be
+considered deprecated: %printer is superior.
+
+** improve syntax errors (UTF-8, internationalization)
+Bison depends on the current locale.  For instance:
+
+%define parse.error verbose
+%code top {
+ #include <stdio.h>
+ #include <stdlib.h>
+ void yyerror(const char* msg) { fprintf(stderr, "%s\n", msg); }
+ int yylex() { return 0; }
+}
+%%
+exp: "↦" | "🎅🐃" | '\n'
+%%
+int main() { return yyparse(); }
+
+gives different results with/without LC_ALL=C.
+
+$ LC_ALL=C /opt/local/bin/bison /tmp/mangle.y -o ascii.c
+$ /opt/local/bin/bison /tmp/mangle.y -o utf8.c
+$ diff -u ascii.c utf8.c -I#line
+--- ascii.c     2019-01-12 08:15:35.878010093 +0100
++++ utf8.c      2019-01-12 08:15:38.856495929 +0100
+@@ -415,9 +415,8 @@
+    First, the terminals, then, starting at YYNTOKENS, nonterminals.  */
+ static const char *const yytname[] =
+ {
+-  "$end", "error", "$undefined", "\"\\342\\206\\246\"",
+-  "\"\\360\\237\\216\\205\\360\\237\\220\\203\"", "'\\n'", "$accept",
+-  "exp", YY_NULLPTR
++  "$end", "error", "$undefined", "\"↦\"", "\"🎅🐃\"", "'\\n'",
++  "$accept", "exp", YY_NULLPTR
+ };
+ #endif
+
+$ gcc ascii.c -o ascii && ./ascii
+syntax error, unexpected $end, expecting "\342\206\246" or "\360\237\216\205\360\237\220\203" or '\n'
+$ gcc utf8.c -o utf8 && ./utf8
+syntax error, unexpected $end, expecting ↦ or 🎅🐃 or '\n'
+
+
+While at it, we should stop using "$end" by default, in favor of "end of
+file", or "end of input", whatever.  See how lalr1.java does that.
+
+** consistency
+token vs terminal, variable vs non terminal.
+
+** Stop indentation in diagnostics
+Before Bison 2.7, we printed "flatly" the dependencies in long diagnostics:
+
+    input.y:2.7-12: %type redeclaration for exp
+    input.y:1.7-12: previous declaration
+
+In Bison 2.7, we indented them
+
+    input.y:2.7-12: error: %type redeclaration for exp
+    input.y:1.7-12:     previous declaration
+
+Later we quoted the source in the diagnostics, and today we have:
+
+    /tmp/foo.y:1.12-14: warning: symbol FOO redeclared [-Wother]
+        1 | %token FOO FOO
+          |            ^~~
+    /tmp/foo.y:1.8-10:      previous declaration
+        1 | %token FOO FOO
+          |        ^~~
+
+The indentation is no longer helping.  We should probably get rid of it, or
+maybe keep it only when -fno-caret. GCC displays this as a "note":
+
+    $ g++-mp-9 -Wall /tmp/foo.c -c
+    /tmp/foo.c:1:10: error: redefinition of 'int foo'
+        1 | int foo, foo;
+          |          ^~~
+    /tmp/foo.c:1:5: note: 'int foo' previously declared here
+        1 | int foo, foo;
+          |     ^~~
+
+Likewise for Clang, contrary to what I believed (because "note:" is written
+in black, so it doesn't show in my terminal :-)
+
+    $ clang++-mp-8.0 -Wall /tmp/foo.c -c
+    clang: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
+    /tmp/foo.c:1:10: error: redefinition of 'foo'
+    int foo, foo;
+             ^
+    /tmp/foo.c:1:5: note: previous definition is here
+    int foo, foo;
+        ^
+    1 error generated.
+
+See also the item "Complaint submessage indentation" below.
+
+** api.token.raw
+Maybe we should exhibit the YYUNDEFTOK token.  It could also be assigned a
+semantic value so that yyerror could be used to report invalid lexemes.
+See also the item "$undefined" below.
 
 ** C++
 Move to int everywhere instead of unsigned?  stack_size, etc.  The parser
@@ -9,11 +110,126 @@ itself uses int (for yylen for instance), yet stack is based on size_t.
 
 Maybe locations should also move to ints.
 
-** C
+Paul Eggert already covered most of this.  But before publishing these
-Introduce state_type rather than spreading yytype_int16 everywhere?
+changes, we need to ask our C++ users if they agree with that change, or if
+we need some migration path.  Could be a %define variable, or simply
+%require "3.5".
 
-** glr.c
+* Bison 3.7
-yyspaceLeft should probably be a pointer diff.
+** 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.
+
+* 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.cc, lalr1.cc
+- ielr: C++ and Java
+- glr: Java
+- token constructors: Java and C
+
+* 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
+** Get rid of YYPRINT and b4_toknum
+Besides yytoknum is wrong when api.token.raw is defined.
+
+** Better design for diagnostics
+The current implementation of diagnostics is adhoc, 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
@@ -34,9 +250,6 @@ 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.
 
-Also, the underscore in print_graph.[ch] isn't very fitting considering the
-dashes in the other filenames.
-
 Since graphviz dies on medium-to-big grammars, maybe consider an other tool?
 
 ** push-parser
@@ -70,11 +283,6 @@ back-ported.
     yytoken = yytranslate_ (yychar);
 
 
-** stack.hh
-Get rid of it.  The original idea is nice, but actually it makes
-the code harder to follow, and uselessly different from the other
-skeletons.
-
 ** Get rid of fake #lines [Bison: ...]
 Possibly as simple as checking whether the column number is nonnegative.
 
@@ -98,10 +306,14 @@ 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?
-
 * Various
+** 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.
+
+Valentin Tolmer is working on this.
+
 ** 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
@@ -171,10 +383,21 @@ 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.
 
+(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.
+
 ** yysyntax_error
 The code bw glr.c and yacc.c is really alike, we can certainly factor
 some parts.
 
+This should be worked on when we also address the expected improvements for
+error generation (e.g., i18n).
+
 
 * Report
 
@@ -185,7 +408,7 @@ 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
@@ -207,13 +430,33 @@ 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
+** Statically check for potential ambiguities in GLR grammars
-<http://www.i3s.unice.fr/~schmitz/papers.html#expamb> for an approach.
+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
 ** Multiple start symbols
-Would be very useful when parsing closely related languages.
+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.
 
 ** Better error messages
 The users are not provided with enough tools to forge their error messages.
@@ -231,6 +474,12 @@ 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.
 
@@ -257,6 +506,10 @@ 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
@@ -276,30 +529,8 @@ XML output for GNU Bison
 https://lists.gnu.org/archive/html/bug-bison/2016-06/msg00000.html
 http://www.cs.cornell.edu/andru/papers/cupex/
 
-* Unit rules
+Andrew Myers and Vincent Imbimbo are working on this item, see
-Maybe we could expand unit rules, i.e., transform
+https://github.com/akimd/bison/issues/12
-
-        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?
 
 * Coding system independence
 Paul notes:
@@ -318,7 +549,7 @@ Paul notes:
         tokens, either via escapes (e.g., "x\0y") or via a NUL byte in
         the source code.  This should get fixed.
 
-* Broken options ?
+* Broken options?
 ** %token-table
 ** Skeleton strategy
 Must we keep %token-table?
@@ -330,10 +561,7 @@ 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
+This is a prerequisite for modules.
-See if we can use precedence between rules to solve RR conflicts.  See
-what POSIX says.
-
 
 * $undefined
 From Hans:
@@ -344,20 +572,6 @@ 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).
-
 * Pre and post actions.
 From: Florian Krohm <[email protected]>
 Subject: YYACT_EPILOGUE
@@ -389,23 +603,6 @@ 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
@@ -415,8 +612,8 @@ End:
 
 -----
 
-Copyright (C) 2001-2004, 2006, 2008-2015, 2018 Free Software Foundation,
+Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2020 Free Software
-Inc.
+Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 

bootstrap

@@ -1,10 +1,10 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2018-10-13.05; # UTC
+scriptversion=2019-01-04.17; # UTC
 
 # Bootstrap this package from checked-out sources.
 
-# Copyright (C) 2003-2018 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
@@ -166,7 +166,7 @@ bootstrap_epilogue() { :; }
 # specified directory.  Fill in the first %s with the destination
 # directory and the second with the domain name.
 po_download_command_format=\
-"wget --mirror --level=1 -nd -q -A.po -P '%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
@@ -963,6 +963,16 @@ 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 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

bootstrap.conf

@@ -1,6 +1,6 @@
 # Bootstrap configuration.
 
-# Copyright (C) 2006-2015, 2018 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
@@ -17,16 +17,21 @@
 
 # gnulib modules used by this package.
 gnulib_modules='
-  argmatch assert
+  argmatch array-list assert assure
+  bitsetv
   calloc-posix close closeout config-h c-strcase
   configmake
   dirname
-  error extensions fdl fopen-safer
+  error extensions
+  fdl fopen-safer fstrcmp
   getopt-gnu
-  gettext git-version-gen gitlog-to-changelog
+  gettext-h git-version-gen gitlog-to-changelog
-  gpl-3.0 hash inttypes isnan javacomp-script
+  gpl-3.0 intprops inttypes isnan javacomp-script
-  javaexec-script ldexpl malloc-gnu
+  javaexec-script
-  mbswidth
+  ldexpl
+  libtextstyle-optional
+  malloc-gnu
+  mbfile mbswidth
   non-recursive-gnulib-prefix-hack
   obstack
   obstack-printf
@@ -34,14 +39,20 @@ gnulib_modules='
   quote quotearg
   readme-release
   realloc-posix
+  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
+  winsz-ioctl
+  winsz-termios
   xalloc
   xalloc-die
   xconcat-filename
+  xhash
+  xlist
   xmemdup0
   xstrndup
 
@@ -49,6 +60,8 @@ gnulib_modules='
   vsnprintf-posix vsprintf-posix
 '
 
+checkout_only_file=README-hacking.md
+
 # Additional xgettext options to use.  Use "\\\newline" to break lines.
 XGETTEXT_OPTIONS=$XGETTEXT_OPTIONS'\\\
  --from-code=UTF-8\\\
@@ -61,24 +74,7 @@ XGETTEXT_OPTIONS_RUNTIME=$XGETTEXT_OPTIONS'\\\
  --keyword=YY_ \\\
 '
 
-# Gettext supplies these files, but we don't need them since
+gnulib_tool_option_extras='--symlink --conditional-dependencies --makefile-name=gnulib.mk --po-base=gnulib-po --po-domain=bison'
-# 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'
 
 bootstrap_post_import_hook()
 {
@@ -96,6 +92,13 @@ 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

@@ -23,3 +23,8 @@
 /useless-if-before-free
 /vc-list-files
 /ylwrap
+/config.libpath
+/install-reloc
+/reloc-ldflags
+/relocatable.sh.in
+/libtool-reloc

build-aux/Darwin.valgrind

@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018 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

@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018 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/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 Akimn Demaille.
+
 use warnings;
 use 5.005;
 use strict;
@@ -12,7 +31,7 @@ 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.
@@ -32,7 +51,6 @@ while (<STDIN>)
             # if $opt, $arg contains the closing ].
             substr ($arg, -1) = ''
                 if $opt eq '[';
-            $arg =~ s/^=//;
             $arg = lc ($arg);
             my $dir_arg = $arg;
             # If the argument is complete (e.g., for --define[=NAME[=VALUE]]),
@@ -48,7 +66,11 @@ while (<STDIN>)
             # are strings and have the same syntax as on the command line.
             if ($dir_arg eq 'name[=value]')
             {
-                $dir_arg = '@var{name} ["@var{value}"]';
+                # -D/-F do not add quotes to the argument.
+                $dir_arg =
+                    $dir eq "%define"
+                    ? '@var{name} [@var{value}]'
+                    : '@var{name} ["@var{value}"]';
             }
             else
             {
@@ -68,12 +90,15 @@ while (<STDIN>)
 my $sep = '';
 foreach my $long (sort keys %option)
 {
-    # Avoid trailing spaces.
+    # Couldn't find a means to escape @ in the format (for @item, @tab), so
-    print $sep;
+    # pass it as a literal to print.
-    $sep = "\n";
+format STDOUT =
-    print '@item @option{', $long, "}\n\@tab";
+@item @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @tab @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @tab @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
-    print ' @option{', $option{$long}, '}' if $option{$long};
+{
-    print "\n\@tab";
+  '@', '@option{' . $long . '}',
-    print ' @code{', $directive{$long}, '}' if $directive{$long};
+  '@', $option{$long} ? ('@option{' . $option{$long} . '}') : '',
-    print "\n";
+  '@', $directive{$long} ? ('@code{' . $directive{$long} . '}') : ''
+}
+.
+    write;
 }

build-aux/local.mk

@@ -1,4 +1,4 @@
-## Copyright (C) 2000-2015, 2018 Free Software Foundation, Inc.
+## 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

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) 2009-2015, 2018 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) 2010-2015, 2018 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

@@ -1,5 +1,5 @@
 ## Customize maint.mk                           -*- makefile -*-
-## Copyright (C) 2008-2015, 2018 Free Software Foundation, Inc.
+## 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
@@ -26,6 +26,9 @@ regen: _version
 manual_title = The Yacc-compatible Parser Generator
 gendocs_options_ = -I $(abs_top_srcdir)/doc -I $(abs_top_builddir)/doc
 
+# 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*
@@ -60,18 +63,6 @@ update-copyright-env = \
 ## More syntax-checks.  ##
 ## -------------------- ##
 
-# At least for Mac OS X's grep, the order between . and [ in "[^.[]"
-# matters:
-# $ LC_ALL=fr_FR grep -nE '[^[.]' /dev/null
-# $ LC_ALL=C grep -nE '[^[.]' /dev/null
-# grep: invalid collating element or class
-# $ LC_ALL=fr_FR grep -nE '[^.[]' /dev/null
-# $ LC_ALL=C grep -nE '[^.[]' /dev/null
-sc_at_parser_check:
-	@prohibit='AT_PARSER_CHECK\(\[+[^.[]|AT_CHECK\(\[+\./'		\
-	halt='use AT_PARSER_CHECK for and only for generated parsers'	\
-	  $(_sc_search_regexp)
-
 # Indent only with spaces.
 # Taken from Coreutils.
 sc_prohibit_tab_based_indentation:
@@ -156,23 +147,29 @@ sc_space_before_open_paren:
 ## 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 $$,$$$$,exclude_file_name_regexp--sc_$(a))))
-$(call exclude,                                                                         \
+
-  bindtextdomain=^lib/main.c$$                                                          \
+$(call exclude,                                                                 \
-  preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                          \
+  bindtextdomain=^lib/main.c$$                                                  \
-  program_name=^lib/main.c$$                                                            \
+  cast_of_argument_to_free=^src/muscle-tab.c$$                                  \
-  prohibit_always-defined_macros=^data/yacc.c$$|^djgpp/                                 \
+  po_check=(^po/POTFILES.in|.md)$$		                                \
-  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$                      \
+  preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                  \
-  prohibit_always-defined_macros+=?|^tests/regression.at$$                              \
+  program_name=^lib/main.c$$                                                    \
-  prohibit_always_true_header_tests=^djgpp/subpipe.h$$                                  \
+  prohibit_always-defined_macros=^data/skeletons/yacc.c$$                       \
-  prohibit_doubled_word=^tests/named-refs.at$$                                          \
+  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$              \
-  prohibit_magic_number_exit=^doc/bison.texi$$                                          \
+  prohibit_always-defined_macros+=?|^tests/regression.at$$                      \
-  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$                      \
+  prohibit_doubled_word=^tests/named-refs.at$$                                  \
-  prohibit_strcmp=^doc/bison\.texi|tests/local\.at$$                                    \
+  prohibit_magic_number_exit=^doc/bison.texi$$                                  \
-  prohibit_tab_based_indentation=install-icc.sh|\.(am|mk)$$|^djgpp/|^\.git|Makefile$$   \
+  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$              \
-  require_config_h_first=^(lib/yyerror|data/(glr|yacc))\.c$$                            \
+  prohibit_strcmp=^doc/bison\.texi|examples|tests/local\.at$$                   \
-  space_before_open_paren=^(data/|djgpp/)                                               \
+  prohibit_tab_based_indentation=install-icc.sh|\.(am|mk)$$|^\.git|tests/input.at|Makefile$$   \
-  two_space_separator_in_usage=^(bootstrap|build-aux/install-icc.sh)                    \
+  require_config_h=^(lib/yyerror|data/skeletons/(glr|yacc))\.c$$                \
-  unmarked_diagnostics=^(djgpp/|doc/bison.texi$$|tests/c\+\+\.at$$)                     \
+  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) 2001-2015, 2018 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
@@ -26,8 +26,10 @@ m4_pattern_allow([^BISON_USE_NLS$])
 
 AC_INIT([GNU Bison],
         m4_esyscmd([build-aux/git-version-gen .tarball-version]),
-        [[email protected]])
+        [[email protected]],
-AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2018])
+        [],
+        [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])
 
@@ -36,6 +38,9 @@ AC_CONFIG_MACRO_DIR([m4])
 
 # We use Automake 1.14's %D% and %C%.
 #
+# 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
 # doesn't like that, so we let the underscore disable gnits.  Between
@@ -94,11 +99,47 @@ AC_ARG_ENABLE([gcc-warnings],
               [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
+  # -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 -Wnull-dereference -Wpointer-arith -Wwrite-strings'
+    -Wformat -Wimplicit-fallthrough -Wnull-dereference
-  warn_c='-Wbad-function-cast -Wshadow -Wstrict-prototypes'
+    -Wno-sign-compare -Wno-tautological-constant-out-of-range-compare
-  warn_cxx='-Wnoexcept'
+    -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
@@ -110,9 +151,11 @@ if test "$enable_gcc_warnings" = yes; then
   # 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
@@ -126,6 +169,11 @@ if test "$enable_gcc_warnings" = yes; then
   # CFLAGS, and restore CFLAGS after the tests.
   save_CFLAGS=$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])
@@ -134,8 +182,6 @@ if test "$enable_gcc_warnings" = yes; then
 
   # Warnings for the test suite, and maybe for bison if GCC is modern
   # enough.
-  gl_WARN_ADD([-Wmissing-declarations], [WARN_CFLAGS_TEST])
-  gl_WARN_ADD([-Wmissing-prototypes], [WARN_CFLAGS_TEST])
   test $lv_cv_gcc_pragma_push_works = yes &&
     AS_VAR_APPEND([WARN_CFLAGS], [" $WARN_CFLAGS_TEST"])
 
@@ -147,6 +193,7 @@ if test "$enable_gcc_warnings" = yes; then
   CFLAGS=$save_CFLAGS
   AC_LANG_POP([C])
 
+
   AC_LANG_PUSH([C++])
   save_CXXFLAGS=$CXXFLAGS
   gl_WARN_ADD([-Werror=unknown-warning-option], [CXXFLAGS])
@@ -154,8 +201,21 @@ if test "$enable_gcc_warnings" = yes; then
   do
     gl_WARN_ADD([$i], [WARN_CXXFLAGS])
   done
+  # 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.
   for i in $warn_tests;
@@ -176,19 +236,32 @@ 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"$CONF_JAVA" != x])
+
+
 AC_ARG_ENABLE([yacc],
   [AC_HELP_STRING([--disable-yacc],
      [do not build a yacc command or an -ly library])],
   , [enable_yacc=yes])
 AM_CONDITIONAL([ENABLE_YACC], [test "$enable_yacc" = yes])
+AC_CONFIG_FILES([src/yacc], [chmod +x src/yacc])
 
 # Checks for programs.
 AM_MISSING_PROG([DOT], [dot])
 AC_PROG_LEX
-$LEX_IS_FLEX || test "X$LEX" = X: || {
+if ! "$LEX_IS_FLEX" || test "X$LEX" = X:; then
   AC_MSG_WARN([bypassing lex because flex is required])
   LEX=:
-}
+fi
+AM_CONDITIONAL([FLEX_WORKS], [$LEX_IS_FLEX])
 AM_CONDITIONAL([FLEX_CXX_WORKS],
   [$LEX_IS_FLEX && test $bison_cv_cxx_works = yes])
 AC_PROG_YACC
@@ -198,9 +271,6 @@ AC_DEFINE_UNQUOTED([M4], ["$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])
@@ -217,14 +287,14 @@ gl_INIT
 
 # Checks for library functions.
 AC_CHECK_FUNCS_ONCE([setlocale])
-AM_WITH_DMALLOC
 
 # 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])
@@ -246,7 +316,7 @@ uname=`uname`
 case $VALGRIND:$uname in
   '':*) ;;
   *:Darwin)
-    # See README-hacking.
+    # See README-hacking.md.
     VALGRIND=;;
   *:*)
     suppfile=build-aux/$uname.valgrind
@@ -266,10 +336,18 @@ AM_MISSING_PROG([AUTOM4TE], [autom4te])
 # Needed by tests/atlocal.in.
 AC_SUBST([GCC])
 
-gt_JAVACOMP([1.7], [1.7])
-gt_JAVAEXEC
-
 AC_CONFIG_FILES([Makefile
                  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/README

@@ -1,72 +0,0 @@
-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.
-
------
-
-Local Variables:
-mode: outline
-End:
-
-Copyright (C) 2002, 2008-2015, 2018 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 +1,192 @@
+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.
+
+- `tag`: string.
+  A representation of the symbol.  Can be 'foo', 'foo.id', '"foo"' etc.
+
+- `user_number`: integer
+  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.
+
+- `number`: integer
+  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 +1,31 @@
+/* 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; }

data/local.mk

@@ -1,4 +1,5 @@
-## Copyright (C) 2002, 2005-2015, 2018 Free Software Foundation, Inc.
+## 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
@@ -14,23 +15,34 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 dist_pkgdata_DATA =                             \
-  data/README                                   \
+  data/README.md                                \
-  data/bison.m4                                 \
+  data/bison-default.css
-  data/c++-skel.m4                              \
+
-  data/c++.m4                                   \
+skeletonsdir = $(pkgdatadir)/skeletons
-  data/c-like.m4                                \
+dist_skeletons_DATA =                           \
-  data/c-skel.m4                                \
+  data/skeletons/bison.m4                       \
-  data/c.m4                                     \
+  data/skeletons/c++-skel.m4                    \
-  data/glr.c                                    \
+  data/skeletons/c++.m4                         \
-  data/glr.cc                                   \
+  data/skeletons/c-like.m4                      \
-  data/java-skel.m4                             \
+  data/skeletons/c-skel.m4                      \
-  data/java.m4                                  \
+  data/skeletons/c.m4                           \
-  data/lalr1.cc                                 \
+  data/skeletons/glr.c                          \
-  data/lalr1.java                               \
+  data/skeletons/glr.cc                         \
-  data/location.cc                              \
+  data/skeletons/java-skel.m4                   \
-  data/stack.hh                                 \
+  data/skeletons/java.m4                        \
-  data/variant.hh                               \
+  data/skeletons/lalr1.cc                       \
-  data/yacc.c
+  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/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. */
+  YYTokenType 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 usions (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/bison.m4

@@ -2,7 +2,8 @@
 
 # Language-independent M4 Macros for Bison.
 
-# Copyright (C) 2002, 2004-2015, 2018 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2015, 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
@@ -191,7 +192,7 @@ m4_define([b4_error],
 #   @warn(1@)
 #   @warn(1@,2@)
 m4_define([b4_warn],
-[b4_error([[warn]], [], [], $@)])
+[b4_warn_at([], [], $@)])
 
 # b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
 # ---------------------------------------------------
@@ -209,7 +210,7 @@ m4_define([b4_warn_at],
 #
 # See b4_warn example.
 m4_define([b4_complain],
-[b4_error([[complain]], [], [], $@)])
+[b4_complain_at([], [], $@)])
 
 # b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
 # -------------------------------------------------------
@@ -225,8 +226,7 @@ m4_define([b4_complain_at],
 #
 # See b4_warn example.
 m4_define([b4_fatal],
-[b4_error([[fatal]], [], [], $@)dnl
+[b4_fatal_at([], [], $@)])
-m4_exit(1)])
 
 # b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
 # ----------------------------------------------------
@@ -263,8 +263,8 @@ m4_define([b4_subtract],
 # -------------------
 # Join with comma, skipping empty arguments.
 # b4_join calls itself recursively until it sees the first non-empty
-# argument, then calls _b4_join which prepends each non-empty argument
+# argument, then calls _b4_join (i.e., `_$0`) which prepends each
-# with a comma.
+# non-empty argument with a comma.
 m4_define([b4_join],
 [m4_if([$#$1],
        [1], [],
@@ -374,60 +374,42 @@ b4_define_flag_if([token_table])        # Whether yytoken_table is demanded.
 b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
 
 
+# b4_glr_cc_if([IF-TRUE], [IF-FALSE])
+# -----------------------------------
+m4_define([b4_glr_cc_if],
+          [m4_if(b4_skeleton, ["glr.cc"], $@)])
+
+
 ## --------- ##
 ## Symbols.  ##
 ## --------- ##
 
-# In order to unify the handling of the various aspects of symbols
+# For a description of the Symbol handling, see README.
-# (tag, type_name, whether terminal, etc.), bison.exe defines one
-# macro per (token, field), where field can has_id, id, etc.: see
-# src/output.c:prepare_symbols_definitions().
 #
-# The various FIELDS are:
+# The following macros provide access to symbol related values.
-#
+
-# - has_id: 0 or 1.
+# __b4_symbol(NUM, FIELD)
-#   Whether the symbol has an id.
+# -----------------------
-# - id: string
+# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
-#   If has_id, the id.  Guaranteed to be usable as a C identifier.
+# undefined.
-#   Prefixed by api.token.prefix if defined.
+m4_define([__b4_symbol],
-# - tag: string.
+[m4_indir([b4_symbol($1, $2)])])
-#   A representat of the symbol.  Can be 'foo', 'foo.id', '"foo"' etc.
+
-# - user_number: integer
-#   The assigned (external) number as used by yylex.
-# - is_token: 0 or 1
-#   Whether this is a terminal symbol.
-# - number: integer
-#   The internalized number (used after yytranslate).
-# - 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
-#   If the symbol has a printer, everything about it.
-# - has_destructor, destructor, destructor_file, destructor_line
-#   Likewise.
-#
-# The following macros provide access to these values.
 
 # _b4_symbol(NUM, FIELD)
 # ----------------------
-# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
+# Recover a FIELD about symbol #NUM (or "orig NUM").  Fails if
 # undefined.
 m4_define([_b4_symbol],
-[m4_indir([b4_symbol($1, $2)])])
+[m4_ifdef([b4_symbol($1, number)],
+          [__b4_symbol(m4_indir([b4_symbol($1, number)]), $2)],
+          [__b4_symbol([$1], [$2])])])
+
 
 
 # b4_symbol(NUM, FIELD)
 # ---------------------
-# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
+# Recover a FIELD about symbol #NUM (or "orig NUM").  Fails if
 # undefined.  If FIELD = id, prepend the token prefix.
 m4_define([b4_symbol],
 [m4_case([$2],
@@ -455,26 +437,19 @@ m4_define([b4_symbol_tag_comment],
 ])
 
 
-# b4_symbol_action_location(SYMBOL-NUM, KIND)
-# -------------------------------------------
-# Report the location of the KIND action as FILE:LINE.
-m4_define([b4_symbol_action_location],
-[b4_symbol([$1], [$2_file]):b4_syncline([b4_symbol([$1], [$2_line])])])
-
-
 # b4_symbol_action(SYMBOL-NUM, KIND)
 # ----------------------------------
 # Run the action KIND (destructor or printer) for SYMBOL-NUM.
 m4_define([b4_symbol_action],
 [b4_symbol_if([$1], [has_$2],
 [b4_dollar_pushdef([(*yyvaluep)],
-                   b4_symbol_if([$1], [has_type],
+                   [$1],
-                                [m4_dquote(b4_symbol([$1], [type]))]),
+                   [],
                    [(*yylocationp)])dnl
     _b4_symbol_case([$1])[]dnl
-b4_syncline([b4_symbol([$1], [$2_line])], [b4_symbol([$1], [$2_file])])
+b4_syncline([b4_symbol([$1], [$2_line])], [b4_symbol([$1], [$2_file])])dnl
-      b4_symbol([$1], [$2])
+b4_symbol([$1], [$2])
-b4_syncline([@oline@], [@ofile@])
+b4_syncline([@oline@], [@ofile@])dnl
         break;
 
 b4_dollar_popdef[]dnl
@@ -497,7 +472,7 @@ m4_define([b4_symbol_actions],
 m4_ifval(m4_defn([b4_actions_]),
 [switch (m4_default([$2], [yytype]))
     {
-      m4_defn([b4_actions_])
+m4_defn([b4_actions_])[]dnl
       default:
         break;
     }dnl
@@ -508,7 +483,9 @@ m4_popdef([b4_actions_])dnl
 
 # _b4_symbol_case(SYMBOL-NUM)
 # ---------------------------
-# Issue a "case NUM" for SYMBOL-NUM.
+# Issue a "case NUM" for SYMBOL-NUM.  Ends with its EOL to make it
+# easier to use with m4_map, but then, use []dnl to suppress the last
+# one.
 m4_define([_b4_symbol_case],
 [case b4_symbol([$1], [number]): b4_symbol_tag_comment([$1])])
 ])
@@ -555,9 +532,9 @@ m4_define([b4_any_token_visible_if],
 # ----------------------------
 m4_define([b4_token_format],
 [b4_token_visible_if([$2],
-[m4_quote(m4_format([$1],
+[m4_format([[$1]],
-                     [b4_symbol([$2], [id])],
+           m4_quote(b4_symbol([$2], [id])),
-                     [b4_symbol([$2], [user_number])]))])])
+           m4_quote(b4_symbol([$2], b4_api_token_raw_if([[number]], [[user_number]]))))])])
 
 
 ## ------- ##
@@ -569,7 +546,7 @@ m4_define([b4_token_format],
 # Run actions for the symbol NUMS that all have the same type-name.
 # Skip NUMS that have no type-name.
 #
-# To specify the action to run, define b4_dollar_dollar(NUMBER,
+# To specify the action to run, define b4_dollar_dollar(SYMBOL-NUM,
 # TAG, TYPE).
 m4_define([_b4_type_action],
 [b4_symbol_if([$1], [has_type],
@@ -601,12 +578,15 @@ m4_define([b4_basename],
 [m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
 
 
-# b4_syncline(LINE, FILE)
+# b4_syncline(LINE, FILE)dnl
-# -----------------------
+# --------------------------
+# Should always be following by a dnl.
+#
+# Emit "#line LINE FILE /* __LINE__ __FILE__ */".
 m4_define([b4_syncline],
 [b4_flag_if([synclines],
-[b4_sync_start([$1], [$2]) b4_sync_end([__line__],
+[b4_sync_start([$1], [$2])[]dnl
-                                       [b4_basename(m4_quote(__file__))])[]dnl
+b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
 ])])
 
 # b4_sync_start(LINE, FILE)
@@ -618,7 +598,17 @@ m4_define([b4_sync_start], [b4_comment([$2:$1])])
 # -----------------------
 # Syncline for the current place, which ends.  Typically a comment
 # left for the reader.
-m4_define([b4_sync_end],   [b4_comment([$2:$1])])
+m4_define([b4_sync_end],   [ b4_comment([$2:$1])]
+)
+# This generates dependencies on the Bison skeletons hence lots of
+# useless 'git diff'.  This location is useless for the regular
+# user (who does not care about the skeletons) and is actually not
+# useful for Bison developpers too (I, Akim, never used this to locate
+# the code in skeletons that generated output).  So disable it
+# completely.  If someone thinks this was actually useful, a %define
+# variable should be provided to control the level of verbosity of
+# '#line', in replacement of --no-lines.
+m4_define([b4_sync_end])
 
 
 # b4_user_code(USER-CODE)
@@ -768,8 +758,10 @@ m4_define([b4_percent_define_get_kind],
           [m4_indir([b4_percent_define_kind(]$1[)])],
           [b4_fatal([[$0: undefined %%define variable '%s']], [$1])])])
 
-# b4_percent_define_get_syncline(VARIABLE)
+# b4_percent_define_get_syncline(VARIABLE)dnl
-# ----------------------------------------
+# -------------------------------------------
+# Should always be following by a dnl.
+#
 # 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
@@ -983,10 +975,9 @@ 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]],
+[b4_comment(m4_if([$#], [0], [[[Unqualified %code blocks.]]],
-                   [["%code ]$1["]])[ blocks.]])
+                  [[["%code ]$1[" blocks.]]]))
-b4_user_code([m4_indir(b4_macro_name)])
+b4_user_code([m4_indir(b4_macro_name)])])dnl
-])dnl
 m4_popdef([b4_macro_name])])
 
 # b4_percent_code_ifdef(QUALIFIER, IF-TRUE, [IF-FALSE])
@@ -1010,6 +1001,7 @@ m4_define([b4_percent_code_ifdef],
 # b4_parse_trace_if([IF-DEBUG-TRACES-ARE-ENABLED], [IF-NOT])
 # b4_token_ctor_if([IF-YYLEX-RETURNS-A-TOKEN], [IF-NOT])
 # ----------------------------------------------------------
+b4_percent_define_if_define([api.token.raw])
 b4_percent_define_if_define([token_ctor], [api.token.constructor])
 b4_percent_define_if_define([locations])     # Whether locations are tracked.
 b4_percent_define_if_define([parse.assert])
@@ -1086,10 +1078,10 @@ m4_define_default([b4_location_initial_line],   [1])
 ## Sanity checks.  ##
 ## --------------- ##
 
-# api.location.prefix={...} (Java and C++).
+# api.location.type={...} (C, C++ and Java).
 b4_percent_define_check_kind([api.location.type], [code], [deprecated])
 
-# api.position.prefix={...} (Java).
+# api.position.type={...} (Java).
 b4_percent_define_check_kind([api.position.type], [code], [deprecated])
 
 # api.prefix >< %name-prefix.

data/skeletons/c++-skel.m4

@@ -2,8 +2,8 @@
 
 # C++ skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2015, 2018 Free Software Foundation,
+# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
-# Inc.
+# 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
@@ -18,10 +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_glr_if(             [m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.cc]])])
-b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_pkgdatadir/[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

@@ -2,7 +2,7 @@
 
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2018 Free Software Foundation, Inc.
+# 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
@@ -22,10 +22,10 @@ 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++])])
 
-m4_include(b4_pkgdatadir/[c.m4])
+m4_include(b4_skeletonsdir/[c.m4])
 
 b4_percent_define_check_kind([api.namespace], [code], [deprecated])
-b4_percent_define_check_kind([parser_class_name], [code], [deprecated])
+b4_percent_define_check_kind([api.parser.class], [code], [deprecated])
 
 
 ## ----- ##
@@ -72,6 +72,22 @@ m4_define([b4_cxx_portability],
 # 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
 ])
 
@@ -80,7 +96,7 @@ m4_define([b4_cxx_portability],
 ## Default values.  ##
 ## ---------------- ##
 
-b4_percent_define_default([[parser_class_name]], [[parser]])
+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.
@@ -131,13 +147,13 @@ m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*$]), [-1], [],
                 [[namespace reference has a trailing "::"]])])
 
 m4_define([b4_namespace_open],
-[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
+[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]])
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
 m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
                                     [^\(.\)[	 ]*\(::\)?\([^][:]\|:[^:]\)*],
                                     [\1])),
@@ -178,7 +194,7 @@ m4_define([b4_value_type_declare],
 [union\|union-directive],
 [[    union semantic_type
     {
-    ]b4_user_union_members[
+]b4_user_union_members[
     };]])])dnl
 ])
 
@@ -200,7 +216,18 @@ m4_define([b4_public_types_declare],
     /// 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);]b4_locations_if([
+      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;])[
     };
 
@@ -224,11 +251,11 @@ m4_define([b4_public_types_declare],
 ]])
 
 
-# b4_symbol_type_declare
+# b4_symbol_type_define
-# ----------------------
+# ---------------------
 # Define symbol_type, the external type for symbols used for symbol
 # constructors.
-m4_define([b4_symbol_type_declare],
+m4_define([b4_symbol_type_define],
 [[    /// A complete symbol.
     ///
     /// Expects its Base type to provide access to the symbol type
@@ -242,14 +269,21 @@ m4_define([b4_symbol_type_declare],
       typedef Base super_type;
 
       /// Default constructor.
-      basic_symbol ();
+      basic_symbol ()
+        : value ()]b4_locations_if([
+        , location ()])[
+      {}
 
-      /// Move or copy constructor.
+#if 201103L <= YY_CPLUSPLUS
-      basic_symbol (YY_RVREF (basic_symbol) other);
+      /// Move constructor.
+      basic_symbol (basic_symbol&& that);
+#endif
+
+      /// Copy constructor.
+      basic_symbol (const basic_symbol& that);]b4_variant_if([[
 
-]b4_variant_if([[
       /// Constructor for valueless symbols, and symbols from each type.
-]b4_type_foreach([b4_basic_symbol_constructor_declare])], [[
+]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])[);
@@ -257,16 +291,35 @@ m4_define([b4_symbol_type_declare],
       /// 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])[);]])[
+                    YY_RVREF (location_type) l])[);
-
+]])[
       /// Destroy the symbol.
-      ~basic_symbol ();
+      ~basic_symbol ()
+      {
+        clear ();
+      }
 
       /// Destroy contents, and record that is empty.
-      void clear ();
+      void clear ()
+      {]b4_variant_if([[
+        // User destructor.
+        symbol_number_type yytype = this->type_get ();
+        basic_symbol<Base>& yysym = *this;
+        (void) yysym;
+        switch (yytype)
+        {
+]b4_symbol_foreach([b4_symbol_destructor])dnl
+[       default:
+          break;
+        }
+
+        // Type destructor.
+]b4_symbol_variant([[yytype]], [[value]], [[template destroy]])])[
+        Base::clear ();
+      }
 
       /// Whether empty.
-      bool empty () const;
+      bool empty () const YY_NOEXCEPT;
 
       /// Destructive move, \a s is emptied into this.
       void move (basic_symbol& s);
@@ -280,7 +333,7 @@ m4_define([b4_symbol_type_declare],
     private:
 #if YY_CPLUSPLUS < 201103L
       /// Assignment operator.
-      basic_symbol& operator= (const basic_symbol& other);
+      basic_symbol& operator= (const basic_symbol& that);
 #endif
     };
 
@@ -290,8 +343,13 @@ m4_define([b4_symbol_type_declare],
       /// Default constructor.
       by_type ();
 
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      by_type (by_type&& that);
+#endif
+
       /// Copy constructor.
-      by_type (const by_type& other);
+      by_type (const by_type& that);
 
       /// The symbol type as needed by the constructor.
       typedef token_type kind_type;
@@ -307,10 +365,7 @@ m4_define([b4_symbol_type_declare],
 
       /// The (internal) type number (corresponding to \a type).
       /// \a empty when empty.
-      symbol_number_type type_get () const;
+      symbol_number_type type_get () const YY_NOEXCEPT;
-
-      /// The token.
-      token_type token () const;
 
       /// The symbol type.
       /// \a empty_symbol when empty.
@@ -319,7 +374,17 @@ m4_define([b4_symbol_type_declare],
     };
 
     /// "External" symbols: returned by the scanner.
-    typedef basic_symbol<by_type> symbol_type;
+    struct symbol_type : basic_symbol<by_type>
+    {]b4_variant_if([[
+      /// Superclass.
+      typedef basic_symbol<by_type> super_type;
+
+      /// Empty symbol.
+      symbol_type () {}
+
+      /// Constructor for valueless symbols, and symbols from each type.
+]b4_type_foreach([_b4_token_constructor_define])dnl
+    ])[};
 ]])
 
 
@@ -327,34 +392,33 @@ m4_define([b4_symbol_type_declare],
 # -----------------------------
 # Provide the implementation needed by the public types.
 m4_define([b4_public_types_define],
-[  b4_inline([$1])b4_parser_class_name[::syntax_error::syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
+[[  // basic_symbol.
-    : std::runtime_error (m)]b4_locations_if([
+#if 201103L <= YY_CPLUSPLUS
-    , location (l)])[
-  {}
-
-  // basic_symbol.
   template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol ()
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (basic_symbol&& that)
-    : value ()]b4_locations_if([
+    : Base (std::move (that))
-    , location ()])[
+    , value (]b4_variant_if([], [std::move (that.value)]))b4_locations_if([
-  {}
+    , location (std::move (that.location))])[
-
-  template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (YY_RVREF (basic_symbol) other)
-    : Base (YY_MOVE (other))
-    , value (]b4_variant_if([], [YY_MOVE (other.value)]))b4_locations_if([
-    , location (YY_MOVE (other.location))])[
   {]b4_variant_if([
-    b4_symbol_variant([other.type_get ()], [value], [YY_MOVE_OR_COPY],
+    b4_symbol_variant([this->type_get ()], [value], [move],
-                      [YY_MOVE (other.value)])])[
+                      [std::move (that.value)])
-  }
+  ])[}
+#endif
 
-]b4_variant_if([[
+  template <typename Base>
-  // Implementation of basic_symbol constructor for each type.
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (const basic_symbol& that)
-]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
+    : Base (that)
+    , value (]b4_variant_if([], [that.value]))b4_locations_if([
+    , location (that.location)])[
+  {]b4_variant_if([
+    b4_symbol_variant([this->type_get ()], [value], [copy],
+                      [YY_MOVE (that.value)])
+  ])[}
+
+]b4_variant_if([], [[
   /// Constructor for valueless symbols.
   template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
+  ]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)
@@ -363,7 +427,7 @@ m4_define([b4_public_types_define],
   {}
 
   template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
+  ]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]))[)
@@ -374,42 +438,16 @@ m4_define([b4_public_types_define],
     (void) v;
     ]b4_symbol_variant([this->type_get ()], [value], [YY_MOVE_OR_COPY], [YY_MOVE (v)])])[}]])[
 
-  template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::~basic_symbol ()
-  {
-    clear ();
-  }
-
-  template <typename Base>
-  void
-  ]b4_parser_class_name[::basic_symbol<Base>::clear ()
-  {]b4_variant_if([[
-    // User destructor.
-    symbol_number_type yytype = this->type_get ();
-    basic_symbol<Base>& yysym = *this;
-    (void) yysym;
-    switch (yytype)
-    {
-]b4_symbol_foreach([b4_symbol_destructor])dnl
-[   default:
-      break;
-    }
-
-    // Type destructor.
-  ]b4_symbol_variant([[yytype]], [[value]], [[template destroy]])])[
-    Base::clear ();
-  }
-
   template <typename Base>
   bool
-  ]b4_parser_class_name[::basic_symbol<Base>::empty () const
+  ]b4_parser_class[::basic_symbol<Base>::empty () const YY_NOEXCEPT
   {
     return Base::type_get () == empty_symbol;
   }
 
   template <typename Base>
   void
-  ]b4_parser_class_name[::basic_symbol<Base>::move (basic_symbol& s)
+  ]b4_parser_class[::basic_symbol<Base>::move (basic_symbol& s)
   {
     super_type::move (s);
     ]b4_variant_if([b4_symbol_variant([this->type_get ()], [value], [move],
@@ -419,62 +457,52 @@ m4_define([b4_public_types_define],
   }
 
   // by_type.
-  ]b4_inline([$1])b4_parser_class_name[::by_type::by_type ()
+  ]b4_inline([$1])b4_parser_class[::by_type::by_type ()
     : type (empty_symbol)
   {}
 
-  ]b4_inline([$1])b4_parser_class_name[::by_type::by_type (const by_type& other)
+#if 201103L <= YY_CPLUSPLUS
-    : type (other.type)
+  ]b4_inline([$1])b4_parser_class[::by_type::by_type (by_type&& that)
+    : type (that.type)
+  {
+    that.clear ();
+  }
+#endif
+
+  ]b4_inline([$1])b4_parser_class[::by_type::by_type (const by_type& that)
+    : type (that.type)
   {}
 
-  ]b4_inline([$1])b4_parser_class_name[::by_type::by_type (token_type t)
+  ]b4_inline([$1])b4_parser_class[::by_type::by_type (token_type t)
     : type (yytranslate_ (t))
   {}
 
   ]b4_inline([$1])[void
-  ]b4_parser_class_name[::by_type::clear ()
+  ]b4_parser_class[::by_type::clear ()
   {
     type = empty_symbol;
   }
 
   ]b4_inline([$1])[void
-  ]b4_parser_class_name[::by_type::move (by_type& that)
+  ]b4_parser_class[::by_type::move (by_type& that)
   {
     type = that.type;
     that.clear ();
   }
 
   ]b4_inline([$1])[int
-  ]b4_parser_class_name[::by_type::type_get () const
+  ]b4_parser_class[::by_type::type_get () const YY_NOEXCEPT
   {
     return type;
   }
-]b4_token_ctor_if([[
+]])
-  ]b4_inline([$1])b4_parser_class_name[::token_type
-  ]b4_parser_class_name[::by_type::token () const
-  {
-    // YYTOKNUM[NUM] -- (External) token number corresponding to the
-    // (internal) symbol number NUM (which must be that of a token).  */
-    static
-    const ]b4_int_type_for([b4_toknum])[
-    yytoken_number_[] =
-    {
-  ]b4_toknum[
-    };
-    return static_cast<token_type> (yytoken_number_[type]);
-  }
-]])[]dnl
-
-b4_symbol_constructor_define])
 
 
-# b4_symbol_constructor_declare
+# b4_token_constructor_define
-# b4_symbol_constructor_define
+# ----------------------------
-# -----------------------------
+# Define symbol constructors for all the value types.
-# Declare/define symbol constructors for all the value types.
 # Use at class-level.  Redefined in variant.hh.
-m4_define([b4_symbol_constructor_declare], [])
+m4_define([b4_token_constructor_define], [])
-m4_define([b4_symbol_constructor_define], [])
 
 
 # b4_yytranslate_define(cc|hh)
@@ -482,41 +510,40 @@ m4_define([b4_symbol_constructor_define], [])
 # Define yytranslate_.  Sometimes used in the header file ($1=hh),
 # sometimes in the cc file.
 m4_define([b4_yytranslate_define],
-[[  // Symbol number corresponding to token number t.
+[  b4_inline([$1])b4_parser_class[::token_number_type
-  ]b4_inline([$1])b4_parser_class_name[::token_number_type
+  ]b4_parser_class[::yytranslate_ (int t)
-  ]b4_parser_class_name[::yytranslate_ (]b4_token_ctor_if([token_type],
-                                                          [int])[ t)
   {
+]b4_api_token_raw_if(
+[[    return static_cast<token_number_type> (t);]],
+[[    // YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to
+    // TOKEN-NUM as returned by yylex.
     static
     const token_number_type
     translate_table[] =
     {
-]b4_translate[
+  ]b4_translate[
     };
-    const unsigned user_token_number_max_ = ]b4_user_token_number_max[;
+    const int user_token_number_max_ = ]b4_user_token_number_max[;
-    const token_number_type undef_token_ = ]b4_undef_token_number[;
 
-    if (static_cast<int> (t) <= yyeof_)
+    if (t <= 0)
       return yyeof_;
-    else if (static_cast<unsigned> (t) <= user_token_number_max_)
+    else if (t <= user_token_number_max_)
       return translate_table[t];
     else
-      return undef_token_;
+      return yy_undef_token_;]])[
   }
 ]])
 
 
 # b4_lhs_value([TYPE])
 # --------------------
-# Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],
 [b4_symbol_value([yyval], [$1])])
 
 
-# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
+# b4_rhs_value(RULE-LENGTH, POS, [TYPE])
 # --------------------------------------
-# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
+# FIXME: Dead code.
-# symbols on RHS.
 m4_define([b4_rhs_value],
 [b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])
 
@@ -528,9 +555,9 @@ m4_define([b4_lhs_location],
 [(yyloc)])
 
 
-# b4_rhs_location(RULE-LENGTH, NUM)
+# b4_rhs_location(RULE-LENGTH, POS)
 # ---------------------------------
-# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],
 [(yylocation_stack_@{($1) - ($2)@})])
@@ -603,7 +630,7 @@ m4_define([b4_yylloc_default_define],
         {                                                               \
           (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
         }                                                               \
-    while (/*CONSTCOND*/ false)
+    while (false)
 # endif
 ]])
 

data/skeletons/c-like.m4

@@ -2,7 +2,7 @@
 
 # Common code for C-like languages (C, C++, Java, etc.)
 
-# Copyright (C) 2012-2015, 2018 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
@@ -39,25 +39,26 @@ m4_define([b4_comment],
 
 
 
-# _b4_dollar_dollar(VALUE, FIELD, DEFAULT-FIELD)
+# _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)" is VALUE is a
+# otherwise just VALUE.  Be sure to pass "(VALUE)" if VALUE is a
 # pointer.
 m4_define([_b4_dollar_dollar],
 [b4_symbol_value([$1],
-                 m4_if([$2], [[]],
+                 [$2],
-                       [[$3]], [[$2]]))])
+                 m4_if([$3], [[]],
+                       [[$4]], [[$3]]))])
 
-# b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION)
+# b4_dollar_pushdef(VALUE-POINTER, SYMBOL-NUM, [TYPE_TAG], LOCATION)
 # b4_dollar_popdef
-# ---------------------------------------------------------
+# ------------------------------------------------------------------
-# Define b4_dollar_dollar for VALUE and DEFAULT-FIELD,
+# 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([$1], m4_dquote($][1), [$2])])dnl
+            [_b4_dollar_dollar([$1], [$2], m4_dquote($][1), [$3])])dnl
-m4_pushdef([b4_at_dollar], [$3])dnl
+m4_pushdef([b4_at_dollar], [$4])dnl
 ])
 m4_define([b4_dollar_popdef],
 [m4_popdef([b4_at_dollar])dnl

data/skeletons/c-skel.m4

@@ -2,8 +2,8 @@
 
 # C skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2015, 2018 Free Software Foundation,
+# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
-# Inc.
+# 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
@@ -18,10 +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_glr_if(             [m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.c]])])
-b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_pkgdatadir/[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/c.m4

@@ -2,7 +2,8 @@
 
 # C M4 Macros for Bison.
 
-# Copyright (C) 2002, 2004-2015, 2018 Free Software Foundation, Inc.
+# Copyright (C) 2002, 2004-2015, 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
@@ -17,7 +18,7 @@
 # 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])
+m4_include(b4_skeletonsdir/[c-like.m4])
 
 # b4_tocpp(STRING)
 # ----------------
@@ -166,38 +167,110 @@ b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
 
 # b4_int_type(MIN, MAX)
 # ---------------------
-# Return the smallest int type able to handle numbers ranging from
+# Return a narrow int type able to handle integers ranging from MIN
-# MIN to MAX (included).
+# to MAX (included) in portable C code.  Assume MIN and MAX fall in
+# 'int' range.
 m4_define([b4_int_type],
-[m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
+[m4_if(b4_ints_in($@,   [-127],   [127]), [1], [signed char],
-       b4_ints_in($@,   [-128],   [127]), [1], [signed char],
+       b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
 
+       b4_ints_in($@, [-32767], [32767]), [1], [short],
        b4_ints_in($@,      [0], [65535]), [1], [unsigned short],
-       b4_ints_in($@, [-32768], [32767]), [1], [short],
-
-       m4_eval([0 <= $1]),                [1], [unsigned],
 
                                                [int])])
 
+# b4_c99_int_type(MIN, MAX)
+# -------------------------
+# Like b4_int_type, but for C99.
+# b4_c99_int_type_define replaces b4_int_type with this.
+m4_define([b4_c99_int_type],
+[m4_if(b4_ints_in($@,   [-127],   [127]), [1], [yytype_int8],
+       b4_ints_in($@,      [0],   [255]), [1], [yytype_uint8],
+
+       b4_ints_in($@, [-32767], [32767]), [1], [yytype_int16],
+       b4_ints_in($@,      [0], [65535]), [1], [yytype_uint16],
+
+                                               [int])])
+
+# b4_c99_int_type_define
+# ----------------------
+# Define private types suitable for holding small integers in C99 or later.
+m4_define([b4_c99_int_type_define],
+[m4_copy_force([b4_c99_int_type], [b4_int_type])dnl
+[/* On compilers that do not define __PTRDIFF_MAX__ etc., make sure
+   <limits.h> and (if available) <stdint.h> are included
+   so that the code can choose integer types of a good width.  */
+
+#ifndef __PTRDIFF_MAX__
+# include <limits.h> /* INFRINGES ON USER NAME SPACE */
+# if defined __STDC_VERSION__ && 199901 <= __STDC_VERSION__
+#  include <stdint.h> /* INFRINGES ON USER NAME SPACE */
+#  define YY_STDINT_H
+# endif
+#endif
+
+/* Narrow types that promote to a signed type and that can represent a
+   signed or unsigned integer of at least N bits.  In tables they can
+   save space and decrease cache pressure.  Promoting to a signed type
+   helps avoid bugs in integer arithmetic.  */
+
+#ifdef __INT_LEAST8_MAX__
+typedef __INT_LEAST8_TYPE__ yytype_int8;
+#elif defined YY_STDINT_H
+typedef int_least8_t yytype_int8;
+#else
+typedef signed char yytype_int8;
+#endif
+
+#ifdef __INT_LEAST16_MAX__
+typedef __INT_LEAST16_TYPE__ yytype_int16;
+#elif defined YY_STDINT_H
+typedef int_least16_t yytype_int16;
+#else
+typedef short yytype_int16;
+#endif
+
+#if defined __UINT_LEAST8_MAX__ && __UINT_LEAST8_MAX__ <= __INT_MAX__
+typedef __UINT_LEAST8_TYPE__ yytype_uint8;
+#elif (!defined __UINT_LEAST8_MAX__ && defined YY_STDINT_H \
+       && UINT_LEAST8_MAX <= INT_MAX)
+typedef uint_least8_t yytype_uint8;
+#elif !defined __UINT_LEAST8_MAX__ && UCHAR_MAX <= INT_MAX
+typedef unsigned char yytype_uint8;
+#else
+typedef short yytype_uint8;
+#endif
+
+#if defined __UINT_LEAST16_MAX__ && __UINT_LEAST16_MAX__ <= __INT_MAX__
+typedef __UINT_LEAST16_TYPE__ yytype_uint16;
+#elif (!defined __UINT_LEAST16_MAX__ && defined YY_STDINT_H \
+       && UINT_LEAST16_MAX <= INT_MAX)
+typedef uint_least16_t yytype_uint16;
+#elif !defined __UINT_LEAST16_MAX__ && USHRT_MAX <= INT_MAX
+typedef unsigned short yytype_uint16;
+#else
+typedef int yytype_uint16;
+#endif]])
+
 
 # b4_int_type_for(NAME)
 # ---------------------
-# Return the smallest int type able to handle numbers ranging from
+# Return a narrow 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)
+# b4_table_value_equals(TABLE, VALUE, LITERAL, SYMBOL)
-# --------------------------------------------
+# ----------------------------------------------------
 # 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.
+# TABLE_min and TABLE_max defined.  SYMBOL denotes
 m4_define([b4_table_value_equals],
 [m4_if(m4_eval($3 < m4_indir([b4_]$1[_min])
                || m4_indir([b4_]$1[_max]) < $3), [1],
        [[0]],
-       [(!!(($2) == ($3)))])])
+       [(($2) == $4)])])
 
 
 ## ----------------- ##
@@ -209,37 +282,39 @@ m4_define([b4_table_value_equals],
 # Provide portable compiler "attributes".  If "noreturn" is passed, define
 # _Noreturn.
 m4_define([b4_attribute_define],
-[[#ifndef YY_ATTRIBUTE
+[[#ifndef YY_ATTRIBUTE_PURE
-# if (defined __GNUC__                                               \
+# if defined __GNUC__ && 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
-      && (2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)))  \
+#  define YY_ATTRIBUTE_PURE __attribute__ ((__pure__))
-     || defined __SUNPRO_C && 0x5110 <= __SUNPRO_C
-#  define YY_ATTRIBUTE(Spec) __attribute__(Spec)
 # else
-#  define YY_ATTRIBUTE(Spec) /* empty */
+#  define YY_ATTRIBUTE_PURE
 # endif
 #endif
 
-#ifndef YY_ATTRIBUTE_PURE
-# define YY_ATTRIBUTE_PURE   YY_ATTRIBUTE ((__pure__))
-#endif
-
 #ifndef YY_ATTRIBUTE_UNUSED
-# define YY_ATTRIBUTE_UNUSED YY_ATTRIBUTE ((__unused__))
+# if defined __GNUC__ && 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
+#  define YY_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+# else
+#  define YY_ATTRIBUTE_UNUSED
+# endif
 #endif
 
 ]m4_bmatch([$1], [\bnoreturn\b], [[/* The _Noreturn keyword of C11.  */
-#if ! defined _Noreturn
+]dnl This is an exact copy of lib/_Noreturn.h.
-# if defined __cplusplus && 201103L <= __cplusplus
+[#ifndef _Noreturn
+# if (defined __cplusplus \
+      && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
+          || (defined _MSC_VER && 1900 <= _MSC_VER)))
 #  define _Noreturn [[noreturn]]
-# elif !(defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__)
+# elif ((!defined __cplusplus || defined __clang__) \
-#  if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
+        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
-       || 0x5110 <= __SUNPRO_C)
+            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__)))
-#   define _Noreturn __attribute__ ((__noreturn__))
+   /* _Noreturn works as-is.  */
-#  elif defined _MSC_VER && 1200 <= _MSC_VER
+# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
-#   define _Noreturn __declspec (noreturn)
+#  define _Noreturn __attribute__ ((__noreturn__))
-#  else
+# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
-#   define _Noreturn
+#  define _Noreturn __declspec (noreturn)
-#  endif
+# else
+#  define _Noreturn
 # endif
 #endif
 
@@ -252,11 +327,11 @@ m4_define([b4_attribute_define],
 
 #if defined __GNUC__ && ! defined __ICC && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
 /* Suppress an incorrect diagnostic about yylval being uninitialized.  */
-# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN \
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN                            \
-    _Pragma ("GCC diagnostic push") \
+    _Pragma ("GCC diagnostic push")                                     \
-    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")\
+    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")              \
     _Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
-# define YY_IGNORE_MAYBE_UNINITIALIZED_END \
+# define YY_IGNORE_MAYBE_UNINITIALIZED_END      \
     _Pragma ("GCC diagnostic pop")
 #else
 # define YY_INITIAL_VALUE(Value) Value
@@ -268,9 +343,36 @@ m4_define([b4_attribute_define],
 #ifndef YY_INITIAL_VALUE
 # define YY_INITIAL_VALUE(Value) /* Nothing. */
 #endif
+
+#if defined __cplusplus && defined __GNUC__ && ! defined __ICC && 6 <= __GNUC__
+# define YY_IGNORE_USELESS_CAST_BEGIN                          \
+    _Pragma ("GCC diagnostic push")                            \
+    _Pragma ("GCC diagnostic ignored \"-Wuseless-cast\"")
+# define YY_IGNORE_USELESS_CAST_END            \
+    _Pragma ("GCC diagnostic pop")
+#endif
+#ifndef YY_IGNORE_USELESS_CAST_BEGIN
+# define YY_IGNORE_USELESS_CAST_BEGIN
+# define YY_IGNORE_USELESS_CAST_END
+#endif
 ]])
 
 
+# b4_cast_define
+# --------------
+m4_define([b4_cast_define],
+[# ifndef YY_CAST
+#  ifdef __cplusplus
+#   define YY_CAST(Type, Val) static_cast<Type> (Val)
+#   define YY_REINTERPRET_CAST(Type, Val) reinterpret_cast<Type> (Val)
+#  else
+#   define YY_CAST(Type, Val) ((Type) (Val))
+#   define YY_REINTERPRET_CAST(Type, Val) ((Type) (Val))
+#  endif
+# endif[]dnl
+])
+
+
 # b4_null_define
 # --------------
 # Portability issues: define a YY_NULLPTR appropriate for the current
@@ -373,15 +475,17 @@ m4_define([b4_token_enums_defines],
 ## ----------------- ##
 
 
-# b4_symbol_value(VAL, [TYPE])
+# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
-# ----------------------------
+# ----------------------------------------------
-# Given a semantic value VAL ($$, $1 etc.), extract its value of type
+# See README.
-# TYPE if TYPE is given, otherwise just return VAL.  The result can be
-# used safely, it is put in parens to avoid nasty precedence issues.
-# TYPE is *not* put in braces, provide some if needed.
 m4_define([b4_symbol_value],
-[($1[]m4_ifval([$2], [.$2]))])
+[m4_ifval([$3],
-
+          [($1.$3)],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [($1.b4_symbol([$2], [type]))],
+                                  [$1])],
+                    [$1])])])
 
 
 ## ---------------------- ##
@@ -467,7 +571,7 @@ m4_define([b4_sync_start], [[#]line $1 $2])
 m4_define([b4_case],
 [  case $1:
 $2
-b4_syncline([@oline@], [@ofile@])
+b4_syncline([@oline@], [@ofile@])dnl
     break;])
 
 
@@ -477,7 +581,7 @@ m4_define([b4_predicate_case],
 [  case $1:
     if (! (
 $2)) YYERROR;
-b4_syncline([@oline@], [@ofile@])
+b4_syncline([@oline@], [@ofile@])dnl
     break;])
 
 
@@ -537,8 +641,12 @@ m4_if(b4_skeleton, ["yacc.c"],
     YYPRINT (yyo, yytoknum[yytype], *yyvaluep);
 # endif
 ]])dnl
-  b4_symbol_actions([printer])[
+b4_percent_code_get([[pre-printer]])dnl
-}
+  YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
+  b4_symbol_actions([printer])
+  YY_IGNORE_MAYBE_UNINITIALIZED_END
+b4_percent_code_get([[post-printer]])dnl
+[}
 
 
 /*---------------------------.
@@ -604,14 +712,17 @@ m4_define([b4_type_define_tag],
 ])
 
 
-# b4_symbol_value_union(VAL, [TYPE])
+# b4_symbol_value_union(VAL, SYMBOL-NUM, [TYPE])
-# ----------------------------------
+# ----------------------------------------------
 # Same of b4_symbol_value, but when api.value.type=union.
 m4_define([b4_symbol_value_union],
-[m4_ifval([$2],
+[m4_ifval([$3],
-          [(*($2*)(&$1))],
+          [(*($3*)(&$1))],
-          [$1])])
+          [m4_ifval([$2],
-])
+                    [b4_symbol_if([$2], [has_type],
+                                  [($1.b4_symbol([$2], [type_tag]))],
+                                  [$1])],
+                    [$1])])])
 
 
 # b4_value_type_setup_union
@@ -703,13 +814,13 @@ typedef ]b4_percent_define_get([[api.value.type]])[ ]b4_api_PREFIX[STYPE;
 [m4_bmatch(b4_percent_define_get([[api.value.type]]),
 [union\|union-directive],
 [[#if ! defined ]b4_api_PREFIX[STYPE && ! defined ]b4_api_PREFIX[STYPE_IS_DECLARED
-]b4_percent_define_get_syncline([[api.value.union.name]])[
+]b4_percent_define_get_syncline([[api.value.union.name]])dnl
-union ]b4_percent_define_get([[api.value.union.name]])[
+[union ]b4_percent_define_get([[api.value.union.name]])[
 {
 ]b4_user_union_members[
 };
-]b4_percent_define_get_syncline([[api.value.union.name]])[
+]b4_percent_define_get_syncline([[api.value.union.name]])dnl
-typedef union ]b4_percent_define_get([[api.value.union.name]])[ ]b4_api_PREFIX[STYPE;
+[typedef union ]b4_percent_define_get([[api.value.union.name]])[ ]b4_api_PREFIX[STYPE;
 # define ]b4_api_PREFIX[STYPE_IS_TRIVIAL 1
 # define ]b4_api_PREFIX[STYPE_IS_DECLARED 1
 #endif
@@ -720,7 +831,10 @@ typedef union ]b4_percent_define_get([[api.value.union.name]])[ ]b4_api_PREFIX[S
 # -----------------------
 m4_define([b4_location_type_define],
 [[/* Location type.  */
-#if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
+]b4_percent_define_ifdef([[api.location.type]],
+[[typedef ]b4_percent_define_get([[api.location.type]])[ ]b4_api_PREFIX[LTYPE;
+]],
+[[#if ! defined ]b4_api_PREFIX[LTYPE && ! defined ]b4_api_PREFIX[LTYPE_IS_DECLARED
 typedef struct ]b4_api_PREFIX[LTYPE ]b4_api_PREFIX[LTYPE;
 struct ]b4_api_PREFIX[LTYPE
 {
@@ -732,7 +846,7 @@ struct ]b4_api_PREFIX[LTYPE
 # define ]b4_api_PREFIX[LTYPE_IS_DECLARED 1
 # define ]b4_api_PREFIX[LTYPE_IS_TRIVIAL 1
 #endif
-]])
+]])])
 
 
 # b4_declare_yylstype

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 +1,332 @@
+                                                            -*- 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
+])
+
+
+## ------------------------- ##
+## Assigning token numbers.  ##
+## ------------------------- ##
+
+# 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(LIST-OF-PAIRS-TOKEN-NAME-TOKEN-NUMBER)
+# -----------------------------------------------------
+# Output the definition of the tokens as enums.
+m4_define([b4_token_enums],
+[/* Tokens.  */
+public enum YYTokenType {
+
+  /** Token returned by the scanner to signal the end of its input.  */
+  EOF = 0,
+b4_symbol_foreach([b4_token_enum])
+}
+])
+
+# 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

@@ -1,6 +1,6 @@
 # C++ GLR skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018 Free Software Foundation, Inc.
+# 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
@@ -46,11 +46,11 @@
 # We require a pure interface.
 m4_define([b4_pure_flag], [1])
 
-m4_include(b4_pkgdatadir/[c++.m4])
+m4_include(b4_skeletonsdir/[c++.m4])
-b4_bison_locations_if([m4_include(b4_pkgdatadir/[location.cc])])
+b4_bison_locations_if([m4_include(b4_skeletonsdir/[location.cc])])
 
-m4_define([b4_parser_class_name],
+m4_define([b4_parser_class],
-          [b4_percent_define_get([[parser_class_name]])])
+          [b4_percent_define_get([[api.parser.class]])])
 
 # Save the parse parameters.
 m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
@@ -60,10 +60,10 @@ m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
 # New ones.
 m4_ifset([b4_parse_param],
 [m4_define([b4_parse_param_wrap],
-           [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
+           [[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_name[& yyparser], [[yyparser]]]])
+           [[b4_namespace_ref::b4_parser_class[& yyparser], [[yyparser]]]])
 ])
 
 
@@ -81,10 +81,10 @@ m4_define([b4_yy_symbol_print_define],
     [static void],
     [[FILE *],      []],
     [[int yytype],  [yytype]],
-    [[const ]b4_namespace_ref::b4_parser_class_name[::semantic_type *yyvaluep],
+    [[const ]b4_namespace_ref::b4_parser_class[::semantic_type *yyvaluep],
                     [yyvaluep]][]dnl
 b4_locations_if([,
-    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+    [[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp],
                     [yylocationp]]]),
     b4_parse_param)[
 {
@@ -98,18 +98,15 @@ b4_locations_if([,
 [yylloc.initialize ();]m4_ifdef([b4_initial_action], [
 m4_defn([b4_initial_action])]))])[
 
-# Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
+# Hijack the post prologue to declare yyerror.
-# and declaration of yyerror.
 ]m4_append([b4_post_prologue],
-[b4_syncline([@oline@], [@ofile@])[
+[b4_syncline([@oline@], [@ofile@])dnl
-]b4_yylloc_default_define[
+b4_function_declare([yyerror],
-#define YYRHSLOC(Rhs, K) ((Rhs)[K].yystate.yyloc)
-]b4_function_declare([yyerror],
     [static void],b4_locations_if([
-    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+    [[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp],
                         [yylocationp]],])
     b4_parse_param,
-    [[const char* msg], [msg]])])
+    [[const char* msg], [msg]])])[
 
 
 #undef yynerrs
@@ -122,8 +119,7 @@ m4_if(b4_prefix, [yy], [],
 #define yyparse ]b4_prefix[parse
 #define yylex   ]b4_prefix[lex
 #define yyerror ]b4_prefix[error
-#define yydebug ]b4_prefix[debug
+#define yydebug ]b4_prefix[debug]]b4_pure_if([], [[
-]]b4_pure_if([], [[
 #define yylval  ]b4_prefix[lval
 #define yychar  ]b4_prefix[char
 #define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
@@ -132,15 +128,15 @@ m4_if(b4_prefix, [yy], [],
 # Hijack the epilogue to define implementations (yyerror, parser member
 # functions etc.).
 m4_append([b4_epilogue],
-[b4_syncline([@oline@], [@ofile@])[
+[b4_syncline([@oline@], [@ofile@])dnl
-
+[
 /*------------------.
 | Report an error.  |
 `------------------*/
 
 ]b4_function_define([yyerror],
     [static void],b4_locations_if([
-    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+    [[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp],
                         [yylocationp]],])
     b4_parse_param,
     [[const char* msg], [msg]])[
@@ -154,26 +150,27 @@ m4_append([b4_epilogue],
 ]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_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
+  ]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_name::~b4_parser_class_name[ ()
+  ]b4_parser_class::~b4_parser_class[ ()
-  {
+  {}
-  }
+
+  ]b4_parser_class[::syntax_error::~syntax_error () YY_NOEXCEPT YY_NOTHROW
+  {}
 
   int
-  ]b4_parser_class_name[::operator() ()
+  ]b4_parser_class[::operator() ()
   {
     return parse ();
   }
 
   int
-  ]b4_parser_class_name[::parse ()
+  ]b4_parser_class[::parse ()
   {
     return ::yyparse (*this]b4_user_args[);
   }
@@ -184,7 +181,7 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
   `--------------------*/
 
   void
-  ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
+  ]b4_parser_class[::yy_symbol_value_print_ (int yytype,
                            const semantic_type* yyvaluep]b4_locations_if([[,
                            const location_type* yylocationp]])[)
   {]b4_locations_if([[
@@ -198,7 +195,7 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 
 
   void
-  ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
+  ]b4_parser_class[::yy_symbol_print_ (int yytype,
                            const semantic_type* yyvaluep]b4_locations_if([[,
                            const location_type* yylocationp]])[)
   {
@@ -210,26 +207,26 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
   }
 
   std::ostream&
-  ]b4_parser_class_name[::debug_stream () const
+  ]b4_parser_class[::debug_stream () const
   {
     return *yycdebug_;
   }
 
   void
-  ]b4_parser_class_name[::set_debug_stream (std::ostream& o)
+  ]b4_parser_class[::set_debug_stream (std::ostream& o)
   {
     yycdebug_ = &o;
   }
 
 
-  ]b4_parser_class_name[::debug_level_type
+  ]b4_parser_class[::debug_level_type
-  ]b4_parser_class_name[::debug_level () const
+  ]b4_parser_class[::debug_level () const
   {
     return yydebug;
   }
 
   void
-  ]b4_parser_class_name[::set_debug_level (debug_level_type l)
+  ]b4_parser_class[::set_debug_level (debug_level_type l)
   {
     // Actually, it is yydebug which is really used.
     yydebug = l;
@@ -237,7 +234,7 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 
 #endif
 ]m4_popdef([b4_parse_param])dnl
-b4_namespace_close
+b4_namespace_close[]dnl
 ])
 
 
@@ -252,26 +249,54 @@ b4_percent_code_get([[requires]])[
 #include <stdexcept>
 #include <string>
 
-]m4_ifdef([b4_location_file],
+]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_name[
+  class ]b4_parser_class[
   {
   public:
 ]b4_public_types_declare[
 
     /// Build a parser object.
-    ]b4_parser_class_name[ (]b4_parse_param_decl[);
+    ]b4_parser_class[ (]b4_parse_param_decl[);
-    virtual ~]b4_parser_class_name[ ();
+    virtual ~]b4_parser_class[ ();
 
     /// Parse.  An alias for parse ().
     /// \returns  0 iff parsing succeeded.
@@ -281,6 +306,7 @@ b4_percent_code_get([[requires]])[
     /// \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.
@@ -292,8 +318,8 @@ b4_percent_code_get([[requires]])[
     debug_level_type debug_level () const;
     /// Set the current debugging level.
     void set_debug_level (debug_level_type l);
+#endif
 
-  public:
     /// Report a syntax error.]b4_locations_if([[
     /// \param loc    where the syntax error is found.]])[
     /// \param msg    a description of the syntax error.
@@ -328,10 +354,10 @@ b4_percent_define_flag_if([[global_tokens_and_yystype]],
 [b4_token_defines])
 [
 #ifndef ]b4_api_PREFIX[STYPE
-# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class_name[::semantic_type
+# 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_name[::location_type
+# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class[::location_type
 #endif
 
 ]b4_namespace_close[
@@ -340,19 +366,19 @@ b4_percent_define_flag_if([[global_tokens_and_yystype]],
 ])
 
 b4_defines_if(
-[b4_output_begin([b4_spec_defines_file])
+[b4_output_begin([b4_spec_header_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-             [2002-2015, 2018])[
+             [2002-2015, 2018-2020])[
 // C++ GLR parser skeleton written by Akim Demaille.
 
 ]b4_disclaimer[
-]b4_cpp_guard_open([b4_spec_defines_file])[
+]b4_cpp_guard_open([b4_spec_header_file])[
 ]b4_shared_declarations[
-]b4_cpp_guard_close([b4_spec_defines_file])[
+]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_pkgdatadir/[glr.c])
+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, 2009-2015, 2018 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

@@ -2,7 +2,7 @@
 
 # Java language support for Bison
 
-# Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
+# 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
@@ -17,7 +17,7 @@
 # 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])
+m4_include(b4_skeletonsdir/[c-like.m4])
 
 
 # b4_list2(LIST1, LIST2)
@@ -42,32 +42,24 @@ m4_define([b4_percent_define_get3],
 m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
 
 
-# b4_public_if(TRUE, FALSE)
+# b4_parser_class_declaration
-# -------------------------
-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]])
+# The declaration of the parser class ("class YYParser"), with all its
-m4_define([b4_abstract_if],
+# qualifiers/annotations.
-[b4_percent_define_flag_if([abstract], [$1], [$2])])
+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_final_if(TRUE, FALSE)
+[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
-# ---------------------------
+b4_percent_define_flag_if([api.parser.public],   [public ])dnl
-b4_percent_define_default([[final]], [[false]])
+b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
-m4_define([b4_final_if],
+b4_percent_define_flag_if([api.parser.final],    [final ])dnl
-[b4_percent_define_flag_if([final], [$1], [$2])])
+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_strictfp_if(TRUE, FALSE)
+b4_percent_define_get3([api.parser.implements], [ implements ])])
-# ---------------------------
-b4_percent_define_default([[strictfp]], [[false]])
-m4_define([b4_strictfp_if],
-[b4_percent_define_flag_if([strictfp], [$1], [$2])])
 
 
 # b4_lexer_if(TRUE, FALSE)
@@ -155,18 +147,20 @@ b4_symbol_foreach([b4_token_enum])])])
 # b4-case(ID, CODE)
 # -----------------
 # We need to fool Java's stupid unreachable code detection.
-m4_define([b4_case], [  case $1:
+m4_define([b4_case],
+[  case $1:
   if (yyn == $1)
     $2;
   break;
-    ])
+])
 
 # b4_predicate_case(LABEL, CONDITIONS)
 # ------------------------------------
-m4_define([b4_predicate_case], [  case $1:
+m4_define([b4_predicate_case],
+[  case $1:
      if (! ($2)) YYERROR;
     break;
-    ])
+])
 
 
 ## -------- ##
@@ -180,7 +174,7 @@ 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([[parser_class_name]], [code], [deprecated])
+b4_percent_define_check_kind([[api.parser.class]],  [code], [deprecated])
 b4_percent_define_check_kind([[throws]],            [code], [deprecated])
 
 
@@ -192,11 +186,22 @@ b4_percent_define_check_kind([[throws]],            [code], [deprecated])
 m4_define([b4_yystype], [b4_percent_define_get([[api.value.type]])])
 b4_percent_define_default([[api.value.type]], [[Object]])
 
-# %name-prefix
+# b4_api_prefix, b4_api_PREFIX
-m4_define_default([b4_prefix], [[YY]])
+# ----------------------------
+# 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_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])
+# b4_prefix
-m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])])
+# ---------
+# 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]])])
@@ -219,21 +224,40 @@ m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])
 ## ----------------- ##
 
 
-# b4_lhs_value([TYPE])
+# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
-# --------------------
+# ----------------------------------------------
-# Expansion of $<TYPE>$.
+# 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_value(RULE-LENGTH, NUM, [TYPE])
+# b4_rhs_data(RULE-LENGTH, POS)
-# --------------------------------------
+# -----------------------------
-# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
+# See README.
-# symbols on RHS.
+m4_define([b4_rhs_data],
+[yystack.valueAt (b4_subtract($@))])
+
+# 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],
-[(m4_ifval($3, [($3)])[](yystack.valueAt ($1-($2))))])
+[b4_symbol_value([b4_rhs_data([$1], [$2])], [$3], [$4])])
+
 
 # b4_lhs_location()
 # -----------------
@@ -242,12 +266,12 @@ m4_define([b4_lhs_location],
 [(yyloc)])
 
 
-# b4_rhs_location(RULE-LENGTH, NUM)
+# b4_rhs_location(RULE-LENGTH, POS)
 # ---------------------------------
-# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],
-[yystack.locationAt ($1-($2))])
+[yystack.locationAt (b4_subtract($@))])
 
 
 # b4_lex_param
@@ -339,4 +363,4 @@ m4_define([b4_var_decl],
 # -----------------------
 # Expand to either an empty string or "throws THROWS".
 m4_define([b4_maybe_throws],
-          [m4_ifval($1, [throws $1])])
+          [m4_ifval($1, [ throws $1])])

data/skeletons/lalr1.d

@@ -0,0 +1,895 @@
+# 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_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_tokens)[
+]b4_parser_class_declaration[
+{
+  ]b4_identification[
+
+]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.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:
+       `$$ = $1'.  Otherwise, use the top of the stack.
+
+       Otherwise, the following line sets YYVAL to garbage.
+       This behavior is undocumented and Bison
+       users should not rely upon it.  */
+    if (yylen > 0)
+      yyval = yystack.valueAt (yylen - 1);
+    else
+      yyval = yystack.valueAt (0);
+
+]b4_parse_trace_if([[
+    yy_reduce_print (yyn, yystack);]])[
+
+    switch (yyn)
+    {
+]b4_user_actions[
+      default: break;
+    }
+
+]b4_parse_trace_if([[
+    yy_symbol_print ("-> $$ =", 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[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 == "$end")
+      return "end of input";
+
+    return yystr;
+  }
+]b4_parse_trace_if([[
+  /*--------------------------------.
+  | Print this symbol on YYOUTPUT.  |
+  `--------------------------------*/
+
+  private final void yy_symbol_print (string s, int yytype,
+    ref ]b4_yystype[ yyvaluep]dnl
+b4_locations_if([, ref ]b4_location_type[ yylocationp])[)
+  {
+    if (0 < yydebug)
+    {
+      string message = s ~ (yytype < yyntokens_ ? " token " : " nterm ")
+              ~ yytname_[yytype] ~ " ("]b4_locations_if([
+              ~ yylocationp.toString() ~ ": "])[;
+      static if (__traits(compiles, message ~= yyvaluep.toString ()))
+              message ~= yyvaluep.toString ();
+      else
+              message ~= format ("%s", &yyvaluep);
+      message ~= ")";
+      yycdebug (message);
+    }
+  }
+]])[
+  /**
+   * Parse input from the scanner that was specified at object construction
+   * time.  Return whether the end of the input was reached successfully.
+   *
+   * @@return <tt>true</tt> if the parsing succeeds.  Note that this does not
+   *          imply that there were no syntax errors.
+   */
+  public bool parse ()
+  {
+    /// Lookahead and lookahead in internal form.
+    int yychar = yyempty_;
+    int yytoken = 0;
+
+    /* State.  */
+    int yyn = 0;
+    int yylen = 0;
+    int yystate = 0;
+
+    YYStack yystack;
+
+    /* Error handling.  */
+    int yynerrs_ = 0;]b4_locations_if([[
+    /// The location where the error started.
+    ]b4_location_type[ yyerrloc = null;
+
+    /// ]b4_location_type[ of the lookahead.
+    ]b4_location_type[ yylloc;
+
+    /// @@$.
+    ]b4_location_type[ yyloc;]])[
+
+    /// Semantic value of the lookahead.
+    ]b4_yystype[ yylval;
+
+    int yyresult;]b4_parse_trace_if([[
+
+    yycdebug ("Starting parse\n");]])[
+    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([[
+        yycdebug (format("Entering state %d\n", 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 == yyempty_)
+        {]b4_parse_trace_if([[
+          yycdebug ("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 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 = 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 <= YYTokenType.EOF)
+          {
+            /* Return failure if at end of input.  */
+            if (yychar == YYTokenType.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 += yy_error_token_;
+            if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yy_error_token_)
+            {
+              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([[
+        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 final string yysyntax_error (int yystate, int tok)
+  {]b4_error_verbose_if([[
+    /* 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.
+      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 != yy_error_token_
+              && !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 != yy_error_token_
+                   && !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.  */
+    yycdebug (format("Reducing stack by rule %d (line %d), ",
+              yyrule - 1, yylno));
+
+    /* The symbols being reduced.  */
+    for (int yyi = 0; yyi < yynrhs; yyi++)
+      yy_symbol_print (format("   $%d =", yyi + 1),
+                       yystos_[yystack.stateAt(yynrhs - (yyi + 1))],
+                       ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
+                       b4_rhs_location(yynrhs, yyi + 1)])[);
+  }
+]])[
+
+  private static token_number_type yytranslate_ (int t)
+  {
+]b4_api_token_raw_if(
+[[    import std.conv : to;
+    return to!byte (t);]],
+[[    /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
+    immutable token_number_type[] translate_table =
+    @{
+  ]b4_translate[
+    @};
+
+    immutable int user_token_number_max_ = ]b4_user_token_number_max[;
+    immutable token_number_type undef_token_ = ]b4_undef_token_number[;
+
+    if (t <= 0)
+      return YYTokenType.EOF;
+    else if (t <= user_token_number_max_)
+      return translate_table[t];
+    else
+      return undef_token_;]])[
+  }
+
+  alias ]b4_int_type_for([b4_translate])[ token_number_type;
+
+  private static immutable token_number_type yy_error_token_ = 1;
+
+  private static immutable int yylast_ = ]b4_last[;
+  private static immutable int yynnts_ = ]b4_nterms_number[;
+  private static immutable int yyempty_ = -2;
+  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 ();
+    }]])[
+  }
+
+  /* User implementation code.  */
+]b4_percent_code_get[
+}
+]b4_epilogue[]dnl
+b4_output_end

data/skeletons/lalr1.java

@@ -1,6 +1,6 @@
-# Java skeleton for Bison -*- autoconf -*-
+# Java skeleton for Bison                           -*- autoconf -*-
 
-# Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
+# 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
@@ -15,20 +15,14 @@
 # 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])
+m4_include(b4_skeletonsdir/[java.m4])
 
-b4_defines_if([b4_fatal([%s: %%defines does not make sense in Java],
+b4_defines_if([b4_complain([%defines does not make sense in Java])])
-              [b4_skeleton])])
-
-# We do not depend on %debug in Java, but pacify warnings about
-# non-used flags.
-b4_parse_trace_if([0], [0])
 
 m4_define([b4_symbol_no_destructor_assert],
 [b4_symbol_if([$1], [has_destructor],
-              [b4_fatal([%s: %s: %%destructor does not make sense in Java],
+              [b4_complain_at(m4_unquote(b4_symbol([$1], [destructor_loc])),
-                        [b4_skeleton],
+                              [%destructor does not make sense in Java])])])
-                        [b4_symbol_action_location([$1], [destructor])])])])
 b4_symbol_foreach([b4_symbol_no_destructor_assert])
 
 # Setup some macros for api.push-pull.
@@ -71,38 +65,31 @@ m4_define([b4_define_state],[[
     int label = YYNEWSTATE;
 
     /* Error handling.  */
-    int yynerrs_ = 0;
+    int yynerrs_ = 0;]b4_locations_if([[
-    ]b4_locations_if([/* The location where the error started.  */
+    /* The location where the error started.  */
-    b4_location_type yyerrloc = null;
+    ]b4_location_type[ yyerrloc = null;
 
     /* Location. */
-    b4_location_type yylloc = new b4_location_type (null, null);])[
+    ]b4_location_type[ yylloc = new ]b4_location_type[ (null, null);]])[
 
     /* Semantic value of the lookahead.  */
     ]b4_yystype[ yylval = null;
-]])
+]])[
 
-b4_output_begin([b4_parser_file_name])[
+]b4_output_begin([b4_parser_file_name])[
 ]b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
-             [2007-2015, 2018])[
+              [2007-2015, 2018-2020])[
 ]b4_percent_define_ifdef([package], [package b4_percent_define_get([package]);[
 ]])[
 ]b4_user_pre_prologue[
 ]b4_user_post_prologue[
-]b4_percent_code_get([[imports]])
+]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_percent_define_get3([annotations], [], [ ])dnl
+]b4_parser_class_declaration[
-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[
 ]b4_error_verbose_if([[
@@ -112,7 +99,7 @@ b4_percent_define_get3([implements], [ implements ])[
   private boolean yyErrorVerbose = true;
 
   /**
-   * Return whether verbose error messages are enabled.
+   * Whether verbose error messages are enabled.
    */
   public final boolean getErrorVerbose() { return yyErrorVerbose; }
 
@@ -174,12 +161,12 @@ b4_locations_if([[
     }
   }
 
-]])
+]])[
 
-  b4_locations_if([[
+]b4_locations_if([[
   private ]b4_location_type[ yylloc (YYStack rhs, int n)
   {
-    if (n > 0)
+    if (0 < n)
       return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
     else
       return new ]b4_location_type[ (rhs.locationAt (0).end);
@@ -187,7 +174,7 @@ b4_locations_if([[
 
   /**
    * Communication interface between the scanner and the Bison-generated
-   * parser <tt>]b4_parser_class_name[</tt>.
+   * parser <tt>]b4_parser_class[</tt>.
    */
   public interface Lexer {
     /** Token returned by the scanner to signal the end of its input.  */
@@ -195,7 +182,7 @@ b4_locations_if([[
 
 ]b4_token_enums[
 
-    ]b4_locations_if([[/**
+]b4_locations_if([[/**
      * Method to retrieve the beginning position of the last scanned token.
      * @@return the position at which the last scanned token starts.
      */
@@ -219,58 +206,60 @@ b4_locations_if([[
      * ]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])[;
+    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
+     *]b4_locations_if([[ @@param loc The location of the element to which the
      *                error message is related]])[
      * @@param msg The string for the error message.
      */
-     void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String msg);]
+     void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[String msg);
   }
 
-  b4_lexer_if([[private class YYLexer implements Lexer {
+]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([[
+]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])[) ]b4_maybe_throws([b4_init_throws])[
+  public ]b4_parser_class (b4_parse_param_decl([b4_lex_param_decl])[)]b4_maybe_throws([b4_init_throws])[
   {
-    ]b4_percent_code_get([[init]])[
+]b4_percent_code_get([[init]])[
     this.yylexer = new YYLexer(]b4_lex_param_call[);
-    ]b4_parse_param_cons[
+]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]])[) ]b4_maybe_throws([b4_init_throws])[
+  ]b4_lexer_if([[protected]], [[public]]) b4_parser_class[ (]b4_parse_param_decl([[Lexer yylexer]])[)]b4_maybe_throws([b4_init_throws])[
   {
-    ]b4_percent_code_get([[init]])[
+]b4_percent_code_get([[init]])[
     this.yylexer = yylexer;
-    ]b4_parse_param_cons[
+]b4_parse_param_cons[
   }
 
+]b4_parse_trace_if([[
   private java.io.PrintStream yyDebugStream = System.err;
 
   /**
-   * Return the <tt>PrintStream</tt> on which the debugging output is
+   * The <tt>PrintStream</tt> on which the debugging output is printed.
-   * printed.
    */
   public final java.io.PrintStream getDebugStream () { return yyDebugStream; }
 
@@ -294,6 +283,7 @@ b4_lexer_if([[
    * @@param level The verbosity level for debugging output.
    */
   public final void setDebugLevel(int level) { yydebug = level; }
+]])[
 
   /**
    * Print an error message via the lexer.
@@ -323,16 +313,16 @@ b4_lexer_if([[
   public final void yyerror (]b4_position_type[ pos, String msg)
   {
     yylexer.yyerror (new ]b4_location_type[ (pos), msg);
-  }]])
+  }]])[
-
+]b4_parse_trace_if([[
-  [protected final void yycdebug (String s) {
+  protected final void yycdebug (String s) {
-    if (yydebug > 0)
+    if (0 < yydebug)
       yyDebugStream.println (s);
-  }
+  }]])[
 
   private final class YYStack {
-    private int[] stateStack = new int[16];
+    private int[] stateStack = new int[16];]b4_locations_if([[
-    ]b4_locations_if([[private ]b4_location_type[[] locStack = new ]b4_location_type[[16];]])[
+    private ]b4_location_type[[] locStack = new ]b4_location_type[[16];]])[
     private ]b4_yystype[[] valueStack = new ]b4_yystype[[16];
 
     public int size = 16;
@@ -345,8 +335,7 @@ b4_lexer_if([[
         {
           int[] newStateStack = new int[size * 2];
           System.arraycopy (stateStack, 0, newStateStack, 0, height);
-          stateStack = newStateStack;
+          stateStack = newStateStack;]b4_locations_if([[
-          ]b4_locations_if([[
           ]b4_location_type[[] newLocStack = new ]b4_location_type[[size * 2];
           System.arraycopy (locStack, 0, newLocStack, 0, height);
           locStack = newLocStack;]])
@@ -358,8 +347,8 @@ b4_lexer_if([[
           size *= 2;
         }
 
-      stateStack[height] = state;
+      stateStack[height] = state;]b4_locations_if([[
-      ]b4_locations_if([[locStack[height] = loc;]])[
+      locStack[height] = loc;]])[
       valueStack[height] = value;
     }
 
@@ -369,9 +358,9 @@ b4_lexer_if([[
 
     public final void pop (int num) {
       // Avoid memory leaks... garbage collection is a white lie!
-      if (num > 0) {
+      if (0 < num) {
-        java.util.Arrays.fill (valueStack, height - num + 1, height + 1, null);
+        java.util.Arrays.fill (valueStack, height - num + 1, height + 1, null);]b4_locations_if([[
-        ]b4_locations_if([[java.util.Arrays.fill (locStack, height - num + 1, height + 1, null);]])[
+        java.util.Arrays.fill (locStack, height - num + 1, height + 1, null);]])[
       }
       height -= num;
     }
@@ -379,8 +368,9 @@ b4_lexer_if([[
     public final int stateAt (int i) {
       return stateStack[height - i];
     }
+]b4_locations_if([[
 
-    ]b4_locations_if([[public final ]b4_location_type[ locationAt (int i) {
+    public final ]b4_location_type[ locationAt (int i) {
       return locStack[height - i];
     }
 
@@ -389,8 +379,7 @@ b4_lexer_if([[
     }
 
     // Print the state stack on the debug stream.
-    public void print (java.io.PrintStream out)
+    public void print (java.io.PrintStream out) {
-    {
       out.print ("Stack now");
 
       for (int i = 0; i <= height; i++)
@@ -440,10 +429,9 @@ b4_lexer_if([[
 
   private int yyerrstatus_ = 0;
 
-]b4_push_if([dnl
+]b4_push_if([b4_define_state])[
-b4_define_state])[
   /**
-   * Return whether error recovery is being done.  In this state, the parser
+   * Whether error recovery is being done.  In this state, the parser
    * reads token until it reaches a known state, and then restarts normal
    * operation.
    */
@@ -456,7 +444,7 @@ b4_define_state])[
    * @@param yystate   the current state
    * @@param yysym     the nonterminal to push on the stack
    */
-  private int yy_lr_goto_state_ (int yystate, int yysym)
+  private int yyLRGotoState (int yystate, int yysym)
   {
     int yyr = yypgoto_[yysym - yyntokens_] + yystate;
     if (0 <= yyr && yyr <= yylast_ && yycheck_[yyr] == yystate)
@@ -465,37 +453,32 @@ b4_define_state])[
       return yydefgoto_[yysym - yyntokens_];
   }
 
-  private int yyaction (int yyn, YYStack yystack, int yylen) ]b4_maybe_throws([b4_throws])[
+  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)
+    ]b4_yystype[ yyval = (0 < yylen) ? yystack.valueAt (yylen - 1) : yystack.valueAt (0);]b4_locations_if([[
-      yyval = yystack.valueAt (yylen - 1);
+    ]b4_location_type[ yyloc = yylloc (yystack, yylen);]])[]b4_parse_trace_if([[
-    else
-      yyval = yystack.valueAt (0);
 
-    yy_reduce_print (yyn, yystack);
+    yyReducePrint (yyn, yystack);]])[
 
     switch (yyn)
       {
         ]b4_user_actions[
         default: break;
-      }
+      }]b4_parse_trace_if([[
 
-    yy_symbol_print ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[);
+    yySymbolPrint ("-> $$ =", yyr1_[yyn], yyval]b4_locations_if([, yyloc])[);]])[
 
     yystack.pop (yylen);
     yylen = 0;
 
     /* Shift the result of the reduction.  */
-    int yystate = yy_lr_goto_state_ (yystack.stateAt (0), yyr1_[yyn]);
+    int yystate = yyLRGotoState (yystack.stateAt (0), yyr1_[yyn]);
     yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
     return YYNEWSTATE;
   }
@@ -536,21 +519,20 @@ b4_define_state])[
     return yystr;
   }
 ]])[
-
+]b4_parse_trace_if([[
   /*--------------------------------.
   | Print this symbol on YYOUTPUT.  |
   `--------------------------------*/
 
-  private void yy_symbol_print (String s, int yytype,
+  private void yySymbolPrint (String s, int yytype,
-                                 ]b4_yystype[ yyvaluep]dnl
+                             ]b4_yystype[ yyvaluep]dnl
-                                 b4_locations_if([, Object yylocationp])[)
+                              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 ()) + ")");
-  }
+  }]])[
 
 ]b4_push_if([],[[
   /**
@@ -560,31 +542,30 @@ b4_define_state])[
    * @@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])])[]])[
+  public boolean parse ()]b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])[]])[
 ]b4_push_if([
   /**
    * Push Parse input from external lexer
    *
    * @@param yylextoken current token
-   * @@param yylexval current lval
+   * @@param yylexval current lval]b4_locations_if([[
-]b4_locations_if([   * @@param yylexloc current position])[
+   * @@param yylexloc current position]])[
    *
    * @@return <tt>YYACCEPT, YYABORT, YYPUSH_MORE</tt>
    */
-  public int push_parse (int yylextoken, b4_yystype yylexval[]b4_locations_if([, b4_location_type yylexloc]))
+  public int push_parse (int yylextoken, b4_yystype yylexval[]b4_locations_if([, b4_location_type yylexloc]))b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])])[
-      b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])])[
+  {]b4_locations_if([[
-  {
+    /* @@$.  */
-    ]b4_locations_if([/* @@$.  */
+    ]b4_location_type[ yyloc;]])[
-    b4_location_type yyloc;])[
 ]b4_push_if([],[[
-]b4_define_state[
+]b4_define_state[]b4_parse_trace_if([[
-    yycdebug ("Starting parse\n");
+    yycdebug ("Starting parse\n");]])[
     yyerrstatus_ = 0;
 
     /* Initialize the stack.  */
-    yystack.push (yystate, yylval ]b4_locations_if([, yylloc])[);
+    yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
 ]m4_ifdef([b4_initial_action], [
-b4_dollar_pushdef([yylval], [], [yylloc])dnl
+b4_dollar_pushdef([yylval], [], [], [yylloc])dnl
     b4_user_initial_action
 b4_dollar_popdef[]dnl
 ])[
@@ -594,11 +575,11 @@ b4_dollar_popdef[]dnl
       {
         push_parse_initialize ();
 ]m4_ifdef([b4_initial_action], [
-b4_dollar_pushdef([yylval], [], [yylloc])dnl
+b4_dollar_pushdef([yylval], [], [], [yylloc])dnl
     b4_user_initial_action
 b4_dollar_popdef[]dnl
-])[
+])[]b4_parse_trace_if([[
-        yycdebug ("Starting parse\n");
+        yycdebug ("Starting parse\n");]])[
         yyerrstatus_ = 0;
       } else
         label = YYGETTOKEN;
@@ -610,10 +591,10 @@ b4_dollar_popdef[]dnl
       {
         /* New state.  Unlike in the C/C++ skeletons, the state is already
            pushed when we come here.  */
-      case YYNEWSTATE:
+      case YYNEWSTATE:]b4_parse_trace_if([[
         yycdebug ("Entering state " + yystate + "\n");
-        if (yydebug > 0)
+        if (0 < yydebug)
-          yystack.print (yyDebugStream);
+          yystack.print (yyDebugStream);]])[
 
         /* Accept?  */
         if (yystate == yyfinal_)
@@ -622,7 +603,7 @@ b4_dollar_popdef[]dnl
 
         /* Take a decision.  First try without lookahead.  */
         yyn = yypact_[yystate];
-        if (yy_pact_value_is_default_ (yyn))
+        if (yyPactValueIsDefault (yyn))
           {
             label = YYDEFAULT;
             break;
@@ -635,14 +616,13 @@ b4_dollar_popdef[]dnl
           {
 ]b4_push_if([[
             if (!push_token_consumed)
-              return YYPUSH_MORE;
+              return YYPUSH_MORE;]b4_parse_trace_if([[
-            yycdebug ("Reading a token: ");
+            yycdebug ("Reading a token: ");]])[
             yychar = yylextoken;
             yylval = yylexval;]b4_locations_if([
             yylloc = yylexloc;])[
-            push_token_consumed = false;]])[
+            push_token_consumed = false;]], [b4_parse_trace_if([[
-]b4_push_if([],[[
+            yycdebug ("Reading a token: ");]])[
-            yycdebug ("Reading a token: ");
             yychar = yylexer.yylex ();
             yylval = yylexer.getLVal ();]b4_locations_if([
             yylloc = new b4_location_type (yylexer.getStartPos (),
@@ -651,17 +631,9 @@ b4_dollar_popdef[]dnl
           }
 
         /* Convert token to internal form.  */
-        if (yychar <= Lexer.EOF)
+        yytoken = yytranslate_ (yychar);]b4_parse_trace_if([[
-          {
+        yySymbolPrint ("Next token is", yytoken,
-            yychar = yytoken = Lexer.EOF;
+                       yylval]b4_locations_if([, yylloc])[);]])[
-            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.  */
@@ -672,7 +644,7 @@ b4_dollar_popdef[]dnl
         /* <= 0 means reduce or error.  */
         else if ((yyn = yytable_[yyn]) <= 0)
           {
-            if (yy_table_value_is_error_ (yyn))
+            if (yyTableValueIsError (yyn))
               label = YYERRLAB;
             else
               {
@@ -683,10 +655,10 @@ b4_dollar_popdef[]dnl
 
         else
           {
-            /* Shift the lookahead token.  */
+            /* Shift the lookahead token.  */]b4_parse_trace_if([[
-            yy_symbol_print ("Shifting", yytoken,
+            yySymbolPrint ("Shifting", yytoken,
-                             yylval]b4_locations_if([, yylloc])[);
+                           yylval]b4_locations_if([, yylloc])[);
-
+]])[
             /* Discard the token being shifted.  */
             yychar = yyempty_;
 
@@ -734,20 +706,21 @@ b4_dollar_popdef[]dnl
             yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
           }
 
-        ]b4_locations_if([yyerrloc = yylloc;])[
+]b4_locations_if([[
+        yyerrloc = yylloc;]])[
         if (yyerrstatus_ == 3)
           {
-        /* If just tried and failed to reuse lookahead token after an
+            /* If just tried and failed to reuse lookahead token after an
-         error, discard it.  */
+               error, discard it.  */
 
-        if (yychar <= Lexer.EOF)
+            if (yychar <= Lexer.EOF)
-          {
+              {
-          /* Return failure if at end of input.  */
+                /* Return failure if at end of input.  */
-          if (yychar == Lexer.EOF)
+                if (yychar == Lexer.EOF)
-            ]b4_push_if([{label = YYABORT; break;}],[return false;])[
+                  ]b4_push_if([{label = YYABORT; break;}], [return false;])[
-          }
+              }
-        else
+            else
-            yychar = yyempty_;
+              yychar = yyempty_;
           }
 
         /* Else will try to reuse lookahead token after shifting the error
@@ -758,9 +731,8 @@ b4_dollar_popdef[]dnl
       /*-------------------------------------------------.
       | errorlab -- error raised explicitly by YYERROR.  |
       `-------------------------------------------------*/
-      case YYERROR:
+      case YYERROR:]b4_locations_if([[
-
+        yyerrloc = yystack.locationAt (yylen - 1);]])[
-        ]b4_locations_if([yyerrloc = yystack.locationAt (yylen - 1);])[
         /* Do not reclaim the symbols of the rule which action triggered
            this YYERROR.  */
         yystack.pop (yylen);
@@ -778,10 +750,10 @@ b4_dollar_popdef[]dnl
         for (;;)
           {
             yyn = yypact_[yystate];
-            if (!yy_pact_value_is_default_ (yyn))
+            if (!yyPactValueIsDefault (yyn))
               {
-                yyn += yyterror_;
+                yyn += yy_error_token_;
-                if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yyterror_)
+                if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == yy_error_token_)
                   {
                     yyn = yytable_[yyn];
                     if (0 < yyn)
@@ -794,27 +766,28 @@ b4_dollar_popdef[]dnl
             if (yystack.height == 0)
               ]b4_push_if([{label = YYABORT; break;}],[return false;])[
 
-            ]b4_locations_if([yyerrloc = yystack.locationAt (0);])[
+]b4_locations_if([[
+            yyerrloc = yystack.locationAt (0);]])[
             yystack.pop ();
-            yystate = yystack.stateAt (0);
+            yystate = yystack.stateAt (0);]b4_parse_trace_if([[
-            if (yydebug > 0)
+            if (0 < yydebug)
-              yystack.print (yyDebugStream);
+              yystack.print (yyDebugStream);]])[
           }
 
         if (label == YYABORT)
             /* Leave the switch.  */
             break;
 
-]b4_locations_if([
+]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);])[
+        yystack.pop (2);]])[
 
-        /* Shift the error token.  */
+        /* Shift the error token.  */]b4_parse_trace_if([[
-        yy_symbol_print ("Shifting", yystos_[yyn],
+        yySymbolPrint ("Shifting", yystos_[yyn],
-                         yylval]b4_locations_if([, yyloc])[);
+                       yylval]b4_locations_if([, yyloc])[);]])[
 
         yystate = yyn;
         yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
@@ -852,10 +825,10 @@ b4_dollar_popdef[]dnl
     this.label = YYNEWSTATE;
 
     /* Error handling.  */
-    this.yynerrs_ = 0;
+    this.yynerrs_ = 0;]b4_locations_if([[
-    ]b4_locations_if([/* The location where the error started.  */
+    /* The location where the error started.  */
     this.yyerrloc = null;
-    this.yylloc = new b4_location_type (null, null);])[
+    this.yylloc = new ]b4_location_type[ (null, null);]])[
 
     /* Semantic value of the lookahead.  */
     this.yylval = null;
@@ -875,14 +848,13 @@ b4_dollar_popdef[]dnl
    *
    * @@return <tt>YYACCEPT, YYABORT, YYPUSH_MORE</tt>
    */
-  public int push_parse (int yylextoken, b4_yystype yylexval, b4_position_type yylexpos)
+  public int push_parse (int yylextoken, b4_yystype yylexval, b4_position_type yylexpos)b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])
-      b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])
   {
     return push_parse (yylextoken, yylexval, new b4_location_type (yylexpos));
   }
-])[]])
+])[]])[
 
-b4_both_if([[
+]b4_both_if([[
   /**
    * Parse input from the scanner that was specified at object construction
    * time.  Return whether the end of the input was reached successfully.
@@ -891,21 +863,21 @@ b4_both_if([[
    * @@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])])[
+  public boolean parse ()]b4_maybe_throws([b4_list2([b4_lex_throws], [b4_throws])])[
-   {
+  {
-      if (yylexer == null)
+    if (yylexer == null)
-        throw new NullPointerException("Null Lexer");
+      throw new NullPointerException("Null Lexer");
-      int status;
+    int status;
-      do {
+    do {
-        int token = yylexer.yylex();
+      int token = yylexer.yylex();
-        ]b4_yystype[ lval = yylexer.getLVal();
+      ]b4_yystype[ lval = yylexer.getLVal();
 ]b4_locations_if([dnl
-        b4_location_type yyloc = new b4_location_type (yylexer.getStartPos (),
+      b4_location_type yyloc = new b4_location_type (yylexer.getStartPos (),
-                                              yylexer.getEndPos ());])[
+                                            yylexer.getEndPos ());])[]b4_locations_if([[
-        ]b4_locations_if([status = push_parse(token,lval,yyloc);],[
+      status = push_parse(token,lval,yyloc);]], [[
-        status = push_parse(token,lval);])[
+      status = push_parse(token,lval);]])[
-      } while (status == YYPUSH_MORE);
+    } while (status == YYPUSH_MORE);
-      return (status == YYACCEPT);
+    return (status == YYACCEPT);
   }
 ]])[
 
@@ -948,7 +920,7 @@ b4_both_if([[
               new StringBuffer ("syntax error, unexpected ");
             res.append (yytnamerr_ (yytname_[tok]));
             int yyn = yypact_[yystate];
-            if (!yy_pact_value_is_default_ (yyn))
+            if (!yyPactValueIsDefault (yyn))
               {
                 /* Start YYX at -YYN if negative to avoid negative
                    indexes in YYCHECK.  In other words, skip the first
@@ -960,15 +932,15 @@ b4_both_if([[
                 int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
                 int count = 0;
                 for (int x = yyxbegin; x < yyxend; ++x)
-                  if (yycheck_[x + yyn] == x && x != yyterror_
+                  if (yycheck_[x + yyn] == x && x != yy_error_token_
-                      && !yy_table_value_is_error_ (yytable_[x + yyn]))
+                      && !yyTableValueIsError (yytable_[x + yyn]))
                     ++count;
                 if (count < 5)
                   {
                     count = 0;
                     for (int x = yyxbegin; x < yyxend; ++x)
-                      if (yycheck_[x + yyn] == x && x != yyterror_
+                      if (yycheck_[x + yyn] == x && x != yy_error_token_
-                          && !yy_table_value_is_error_ (yytable_[x + yyn]))
+                          && !yyTableValueIsError (yytable_[x + yyn]))
                         {
                           res.append (count++ == 0 ? ", expecting " : " or ");
                           res.append (yytnamerr_ (yytname_[x]));
@@ -986,7 +958,7 @@ b4_both_if([[
    * 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)
+  private static boolean yyPactValueIsDefault (int yyvalue)
   {
     return yyvalue == yypact_ninf_;
   }
@@ -996,7 +968,7 @@ b4_both_if([[
    * value indicates a syntax error.
    * @@param yyvalue the value to check
    */
-  private static boolean yy_table_value_is_error_ (int yyvalue)
+  private static boolean yyTableValueIsError (int yyvalue)
   {
     return yyvalue == yytable_ninf_;
   }
@@ -1005,20 +977,18 @@ b4_both_if([[
   private static final ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
 
   ]b4_parser_tables_define[
-  ]b4_integral_parser_table_define([token_number], [b4_toknum],
-     [[YYTOKEN_NUMBER[YYLEX-NUM] -- Internal symbol number corresponding
-   to YYLEX-NUM.]])[
 
   /* 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])[
 
+]b4_parse_trace_if([[
   ]b4_integral_parser_table_define([rline], [b4_rline],
   [[YYRLINE[YYN] -- Source line where rule number YYN was defined.]])[
 
 
   // Report on the debug stream that the rule yyrule is going to be reduced.
-  private void yy_reduce_print (int yyrule, YYStack yystack)
+  private void yyReducePrint (int yyrule, YYStack yystack)
   {
     if (yydebug == 0)
       return;
@@ -1031,36 +1001,44 @@ b4_both_if([[
 
     /* The symbols being reduced.  */
     for (int yyi = 0; yyi < yynrhs; yyi++)
-      yy_symbol_print ("   $" + (yyi + 1) + " =",
+      yySymbolPrint ("   $" + (yyi + 1) + " =",
-                       yystos_[yystack.stateAt(yynrhs - (yyi + 1))],
+                     yystos_[yystack.stateAt(yynrhs - (yyi + 1))],
-                       ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
+                     ]b4_rhs_data(yynrhs, yyi + 1)b4_locations_if([,
-                       b4_rhs_location(yynrhs, yyi + 1)])[);
+                     b4_rhs_location(yynrhs, yyi + 1)])[);
-  }
+  }]])[
-
-  /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
-  ]b4_integral_parser_table_define([translate_table], [b4_translate])[
 
+  /* YYTRANSLATE_(TOKEN-NUM) -- Symbol number corresponding to TOKEN-NUM
+     as returned by yylex, with out-of-bounds checking.  */
   private static final ]b4_int_type_for([b4_translate])[ yytranslate_ (int t)
-  {
+]b4_api_token_raw_if(dnl
-    if (t >= 0 && t <= yyuser_token_number_max_)
+[[  {
+    return t;
+  }
+]],
+[[  {
+    int user_token_number_max_ = ]b4_user_token_number_max[;
+    ]b4_int_type_for([b4_translate])[ undef_token_ = ]b4_undef_token_number[;
+
+    if (t <= 0)
+      return Lexer.EOF;
+    else if (t <= user_token_number_max_)
       return yytranslate_table_[t];
     else
-      return yyundef_token_;
+      return undef_token_;
   }
+  ]b4_integral_parser_table_define([translate_table], [b4_translate])[
+]])[
+
+  private static final ]b4_int_type_for([b4_translate])[ yy_error_token_ = 1;
 
   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[;
+/* User implementation code.  */
-  private static final int yyundef_token_ = ]b4_undef_token_number[;
+]b4_percent_code_get[]dnl
-
-]/* User implementation code.  */
-b4_percent_code_get[]dnl
 
 }
 

data/skeletons/location.cc

@@ -1,6 +1,6 @@
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018 Free Software Foundation, Inc.
+# 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
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 m4_pushdef([b4_copyright_years],
-           [2002-2015, 2018])
+           [2002-2015, 2018-2020])
 
 
 # b4_position_file
@@ -62,11 +62,14 @@ m4_define([b4_location_define],
 [[  /// A point in a source file.
   class position
   {
-  public:]m4_ifdef([b4_location_constructors], [[
+  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,
-                       unsigned l = ]b4_location_initial_line[u,
+                       counter_type l = ]b4_location_initial_line[,
-                       unsigned c = ]b4_location_initial_column[u)
+                       counter_type c = ]b4_location_initial_column[)
       : filename (f)
       , line (l)
       , column (c)
@@ -75,8 +78,8 @@ m4_define([b4_location_define],
 ]])[
     /// Initialization.
     void initialize (]b4_percent_define_get([[filename_type]])[* fn = YY_NULLPTR,
-                     unsigned l = ]b4_location_initial_line[u,
+                     counter_type l = ]b4_location_initial_line[,
-                     unsigned c = ]b4_location_initial_column[u)
+                     counter_type c = ]b4_location_initial_column[)
     {
       filename = fn;
       line = l;
@@ -86,17 +89,17 @@ m4_define([b4_location_define],
     /** \name Line and Column related manipulators
      ** \{ */
     /// (line related) Advance to the COUNT next lines.
-    void lines (int count = 1)
+    void lines (counter_type count = 1)
     {
       if (count)
         {
-          column = ]b4_location_initial_column[u;
+          column = ]b4_location_initial_column[;
           line = add_ (line, count, ]b4_location_initial_line[);
         }
     }
 
     /// (column related) Advance to the COUNT next columns.
-    void columns (int count = 1)
+    void columns (counter_type count = 1)
     {
       column = add_ (column, count, ]b4_location_initial_column[);
     }
@@ -105,22 +108,21 @@ m4_define([b4_location_define],
     /// File name to which this position refers.
     ]b4_percent_define_get([[filename_type]])[* filename;
     /// Current line number.
-    unsigned line;
+    counter_type line;
     /// Current column number.
-    unsigned column;
+    counter_type column;
 
   private:
     /// Compute max (min, lhs+rhs).
-    static unsigned add_ (unsigned lhs, int rhs, int min)
+    static counter_type add_ (counter_type lhs, counter_type rhs, counter_type min)
     {
-      return static_cast<unsigned> (std::max (min,
+      return lhs + rhs < min ? min : lhs + rhs;
-                                              static_cast<int> (lhs) + rhs));
     }
   };
 
   /// Add \a width columns, in place.
   inline position&
-  operator+= (position& res, int width)
+  operator+= (position& res, position::counter_type width)
   {
     res.columns (width);
     return res;
@@ -128,21 +130,21 @@ m4_define([b4_location_define],
 
   /// Add \a width columns.
   inline position
-  operator+ (position res, int width)
+  operator+ (position res, position::counter_type width)
   {
     return res += width;
   }
 
   /// Subtract \a width columns, in place.
   inline position&
-  operator-= (position& res, int width)
+  operator-= (position& res, position::counter_type width)
   {
     return res += -width;
   }
 
   /// Subtract \a width columns.
   inline position
-  operator- (position res, int width)
+  operator- (position res, position::counter_type width)
   {
     return res -= width;
   }
@@ -182,6 +184,8 @@ m4_define([b4_location_define],
   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)
@@ -197,8 +201,8 @@ m4_define([b4_location_define],
 
     /// Construct a 0-width location in \a f, \a l, \a c.
     explicit location (]b4_percent_define_get([[filename_type]])[* f,
-                       unsigned l = ]b4_location_initial_line[u,
+                       counter_type l = ]b4_location_initial_line[,
-                       unsigned c = ]b4_location_initial_column[u)
+                       counter_type c = ]b4_location_initial_column[)
       : begin (f, l, c)
       , end (f, l, c)
     {}
@@ -206,8 +210,8 @@ m4_define([b4_location_define],
 ])[
     /// Initialization.
     void initialize (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
-                     unsigned l = ]b4_location_initial_line[u,
+                     counter_type l = ]b4_location_initial_line[,
-                     unsigned c = ]b4_location_initial_column[u)
+                     counter_type c = ]b4_location_initial_column[)
     {
       begin.initialize (f, l, c);
       end = begin;
@@ -223,13 +227,13 @@ m4_define([b4_location_define],
     }
 
     /// Extend the current location to the COUNT next columns.
-    void columns (int count = 1)
+    void columns (counter_type count = 1)
     {
       end += count;
     }
 
     /// Extend the current location to the COUNT next lines.
-    void lines (int count = 1)
+    void lines (counter_type count = 1)
     {
       end.lines (count);
     }
@@ -244,39 +248,45 @@ m4_define([b4_location_define],
   };
 
   /// Join two locations, in place.
-  inline location& operator+= (location& res, const location& end)
+  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)
+  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, int width)
+  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, int width)
+  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, int width)
+  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, int width)
+  inline location
+  operator- (location res, location::counter_type width)
   {
     return res -= width;
   }
@@ -305,7 +315,8 @@ m4_define([b4_location_define],
   std::basic_ostream<YYChar>&
   operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
   {
-    unsigned end_col = 0 < loc.end.column ? loc.end.column - 1 : 0;
+    location::counter_type end_col
+      = 0 < loc.end.column ? loc.end.column - 1 : 0;
     ostr << loc.begin;
     if (loc.end.filename
         && (!loc.begin.filename
@@ -327,7 +338,7 @@ m4_ifdef([b4_position_file], [[
 // 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
+// 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.
 
@@ -346,7 +357,6 @@ m4_ifdef([b4_location_file], [[
 
 ]b4_cpp_guard_open([b4_location_path])[
 
-# include <algorithm> // std::max
 # include <iostream>
 # include <string>
 

data/skeletons/stack.hh

@@ -0,0 +1,152 @@
+# 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::reverse_iterator iterator;
+      typedef typename S::const_reverse_iterator const_iterator;
+      typedef typename S::size_type size_type;
+      typedef typename std::ptrdiff_t index_type;
+
+      stack (size_type n = 200)
+        : seq_ (n)
+      {}
+
+      /// 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 ());
+      }
+
+      std::ptrdiff_t
+      ssize () const YY_NOEXCEPT
+      {
+        return std::ptrdiff_t (size ());
+      }
+
+      /// Iterator on top of the stack (going downwards).
+      const_iterator
+      begin () const YY_NOEXCEPT
+      {
+        return seq_.rbegin ();
+      }
+
+      /// Bottom of the stack.
+      const_iterator
+      end () const YY_NOEXCEPT
+      {
+        return seq_.rend ();
+      }
+
+      /// 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:
+      stack (const stack&);
+      stack& operator= (const stack&);
+      /// 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 +1,453 @@
+# 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));
+    }
+
+    /// 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:
+    /// Prohibit blind copies.
+    self_type& operator= (const self_type&);
+    semantic_type (const self_type&);
+
+    /// 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

@@ -1,159 +0,0 @@
-# C++ skeleton for Bison
-
-# Copyright (C) 2002-2015, 2018 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::reverse_iterator iterator;
-    typedef typename S::const_reverse_iterator const_iterator;
-    typedef typename S::size_type size_type;
-
-    stack (size_type n = 200)
-      : seq_ (n)
-    {}
-
-    /// Random access.
-    ///
-    /// Index 0 returns the topmost element.
-    T&
-    operator[] (size_type i)
-    {
-      return seq_[size () - 1 - i];
-    }
-
-    /// Random access.
-    ///
-    /// Index 0 returns the topmost element.
-    T&
-    operator[] (int i)
-    {
-      return operator[] (size_type (i));
-    }
-
-    /// Random access.
-    ///
-    /// Index 0 returns the topmost element.
-    const T&
-    operator[] (size_type i) const
-    {
-      return seq_[size () - 1 - i];
-    }
-
-    /// Random access.
-    ///
-    /// Index 0 returns the topmost element.
-    const T&
-    operator[] (int i) const
-    {
-      return operator[] (size_type (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);
-    }
-
-    void
-    pop (int n = 1)
-    {
-      for (; 0 < n; --n)
-        seq_.pop_back ();
-    }
-
-    void
-    clear ()
-    {
-      seq_.clear ();
-    }
-
-    size_type
-    size () const
-    {
-      return seq_.size ();
-    }
-
-    const_iterator
-    begin () const
-    {
-      return seq_.rbegin ();
-    }
-
-    const_iterator
-    end () const
-    {
-      return seq_.rend ();
-    }
-
-  private:
-    stack (const stack&);
-    stack& operator= (const stack&);
-    /// The wrapped container.
-    S seq_;
-  };
-
-  /// Present a slice of the top of a stack.
-  template <typename T, typename S = stack<T> >
-  class slice
-  {
-  public:
-    slice (const S& stack, int range)
-      : stack_ (stack)
-      , range_ (range)
-    {}
-
-    const T&
-    operator[] (int i) const
-    {
-      return stack_[range_ - i];
-    }
-
-  private:
-    const S& stack_;
-    int range_;
-  };
-]])
-
-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/variant.hh

@@ -1,427 +0,0 @@
-# C++ skeleton for Bison
-
-# Copyright (C) 2002-2015, 2018 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 YYASSERT
-# include <cassert>
-# define YYASSERT assert
-#endif
-]])
-
-# b4_variant_define
-# -----------------
-# Define "variant".
-m4_define([b4_variant_define],
-[[  /// A char[S] 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 state.
-  template <size_t S>
-  struct variant
-  {
-    /// Type of *this.
-    typedef variant<S> self_type;
-
-    /// Empty construction.
-    variant ()
-      : yybuffer_ ()]b4_parse_assert_if([
-      , yytypeid_ (YY_NULLPTR)])[
-    {}
-
-    /// Construct and fill.
-    template <typename T>
-    variant (YY_RVREF (T) t)]b4_parse_assert_if([
-      : yytypeid_ (&typeid (T))])[
-    {
-      YYASSERT (sizeof (T) <= S);
-      new (yyas_<T> ()) T (YY_MOVE (t));
-    }
-
-    /// Destruction, allowed only if empty.
-    ~variant ()
-    {]b4_parse_assert_if([
-      YYASSERT (!yytypeid_);
-    ])[}
-
-    /// Instantiate an empty \a T in here.
-    template <typename T>
-    T&
-    emplace ()
-    {]b4_parse_assert_if([
-      YYASSERT (!yytypeid_);
-      YYASSERT (sizeof (T) <= S);
-      yytypeid_ = & typeid (T);])[
-      return *new (yyas_<T> ()) T ();
-    }
-
-# 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([
-      YYASSERT (!yytypeid_);
-      YYASSERT (sizeof (T) <= S);
-      yytypeid_ = & typeid (T);])[
-      return *new (yyas_<T> ()) T (std::forward <U>(u));
-    }
-# else
-    /// Instantiate a \a T in here from \a t.
-    template <typename T>
-    T&
-    emplace (const T& t)
-    {]b4_parse_assert_if([
-      YYASSERT (!yytypeid_);
-      YYASSERT (sizeof (T) <= S);
-      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 ()
-    {]b4_parse_assert_if([
-      YYASSERT (yytypeid_);
-      YYASSERT (*yytypeid_ == typeid (T));
-      YYASSERT (sizeof (T) <= S);])[
-      return *yyas_<T> ();
-    }
-
-    /// Const accessor to a built \a T (for %printer).
-    template <typename T>
-    const T&
-    as () const
-    {]b4_parse_assert_if([
-      YYASSERT (yytypeid_);
-      YYASSERT (*yytypeid_ == typeid (T));
-      YYASSERT (sizeof (T) <= S);])[
-      return *yyas_<T> ();
-    }
-
-    /// Swap the content with \a other, 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
-    /// variant::move ().
-    template <typename T>
-    void
-    swap (self_type& other)
-    {]b4_parse_assert_if([
-      YYASSERT (yytypeid_);
-      YYASSERT (*yytypeid_ == *other.yytypeid_);])[
-      std::swap (as<T> (), other.as<T> ());
-    }
-
-    /// Move the content of \a other to this.
-    ///
-    /// Destroys \a other.
-    template <typename T>
-    void
-    move (self_type& other)
-    {
-# if 201103L <= YY_CPLUSPLUS
-      emplace<T> (std::move (other.as<T> ()));
-# else
-      emplace<T> ();
-      swap<T> (other);
-# endif
-      other.destroy<T> ();
-    }
-
-# if 201103L <= YY_CPLUSPLUS
-    /// Move the content of \a other to this.
-    template <typename T>
-    void
-    move (self_type&& other)
-    {
-      emplace<T> (std::move (other.as<T> ()));
-      other.destroy<T> ();
-    }
-#endif
-
-    /// Copy the content of \a other to this.
-    template <typename T>
-    void
-    copy (const self_type& other)
-    {
-      emplace<T> (other.as<T> ());
-    }
-
-    /// Destroy the stored \a T.
-    template <typename T>
-    void
-    destroy ()
-    {
-      as<T> ().~T ();]b4_parse_assert_if([
-      yytypeid_ = YY_NULLPTR;])[
-    }
-
-  private:
-    /// Prohibit blind copies.
-    self_type& operator= (const self_type&);
-    variant (const self_type&);
-
-    /// Accessor to raw memory as \a T.
-    template <typename T>
-    T*
-    yyas_ ()
-    {
-      void *yyp = yybuffer_.yyraw;
-      return static_cast<T*> (yyp);
-     }
-
-    /// Const accessor to raw memory as \a T.
-    template <typename T>
-    const T*
-    yyas_ () const
-    {
-      const void *yyp = yybuffer_.yyraw;
-      return static_cast<const T*> (yyp);
-     }
-
-    union
-    {
-      /// Strongest alignment constraints.
-      long double yyalign_me;
-      /// A buffer large enough to store any of the semantic values.
-      char yyraw[S];
-    } yybuffer_;]b4_parse_assert_if([
-
-    /// Whether the content is built: if defined, the name of the stored type.
-    const std::type_info *yytypeid_;])[
-  };
-]])
-
-
-## -------------------------- ##
-## Adjustments for variants.  ##
-## -------------------------- ##
-
-
-# b4_value_type_declare
-# ---------------------
-# Declare semantic_type.
-m4_define([b4_value_type_declare],
-[[    /// An auxiliary type to compute the largest semantic type.
-    union union_type
-    {]b4_type_foreach([b4_char_sizeof])[};
-
-    /// Symbol semantic values.
-    typedef variant<sizeof (union_type)> semantic_type;][]dnl
-])
-
-
-# How the semantic value is extracted when using variants.
-
-# b4_symbol_value(VAL, [TYPE])
-# ----------------------------
-m4_define([b4_symbol_value],
-[m4_ifval([$2],
-          [$1.as< $2 > ()],
-          [$1])])
-
-# b4_symbol_value_template(VAL, [TYPE])
-# -------------------------------------
-# Same as b4_symbol_value, but used in a template method.
-m4_define([b4_symbol_value_template],
-[m4_ifval([$2],
-          [$1.template as< $2 > ()],
-          [$1])])
-
-
-
-## ------------- ##
-## make_SYMBOL.  ##
-## ------------- ##
-
-
-# _b4_symbol_constructor_declare(SYMBOL-NUMBER)
-# ---------------------------------------------
-# Declare the overloaded version of make_symbol for the (common) type of
-# these SYMBOL-NUMBERS.  Use at class-level.
-m4_define([_b4_symbol_constructor_declare],
-[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
-[    static
-    symbol_type
-    make_[]_b4_symbol([$1], [id]) (dnl
-b4_join(b4_symbol_if([$1], [has_type],
-                     [YY_COPY (b4_symbol([$1], [type])) v]),
-        b4_locations_if([YY_COPY (location_type) l])));
-
-])])])
-
-
-# b4_symbol_constructor_declare
-# -----------------------------
-# Declare symbol constructors for all the value types.
-# Use at class-level.
-m4_define([b4_symbol_constructor_declare],
-[    // Symbol constructors declarations.
-b4_symbol_foreach([_b4_symbol_constructor_declare])])
-
-
-
-# _b4_symbol_constructor_define(SYMBOL-NUMBER)
-# --------------------------------------------
-# Define symbol constructor for this SYMBOL-NUMBER.
-m4_define([_b4_symbol_constructor_define],
-[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
-[  inline
-  b4_parser_class_name::symbol_type
-  b4_parser_class_name::make_[]_b4_symbol([$1], [id]) (dnl
-b4_join(b4_symbol_if([$1], [has_type],
-                     [YY_COPY (b4_symbol([$1], [type])) v]),
-        b4_locations_if([YY_COPY (location_type) l])))
-  {
-    return symbol_type (b4_join([token::b4_symbol([$1], [id])],
-                                b4_symbol_if([$1], [has_type], [YY_MOVE (v)]),
-                                b4_locations_if([YY_MOVE (l)])));
-  }
-
-])])])
-
-
-# b4_basic_symbol_constructor_declare
-# -----------------------------------
-# Generate a constructor declaration for basic_symbol from given type.
-m4_define([b4_basic_symbol_constructor_declare],
-[[# 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]))[);
-#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]))[);
-#endif
-]])
-
-# b4_basic_symbol_constructor_define
-# ----------------------------------
-# Generate a constructor implementation for basic_symbol from given type.
-m4_define([b4_basic_symbol_constructor_define],
-[[# if 201103L <= YY_CPLUSPLUS
-  template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::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
-  template <typename Base>
-  ]b4_parser_class_name[::basic_symbol<Base>::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_symbol_constructor_define
-# ----------------------------
-# Define the overloaded versions of make_symbol for all the value types.
-m4_define([b4_symbol_constructor_define],
-[  // Implementation of make_symbol for each symbol type.
-b4_symbol_foreach([_b4_symbol_constructor_define])])

data/xslt/bison.xsl

@@ -3,7 +3,7 @@
 <!--
     bison.xsl - common templates for Bison XSLT.
 
-    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 

data/xslt/xml2dot.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2dot.xsl - transform Bison XML Report into DOT.
 
-    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 

data/xslt/xml2text.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2text.xsl - transform Bison XML Report into plain text.
 
-    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 

data/xslt/xml2xhtml.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2html.xsl - transform Bison XML Report into XHTML.
 
-    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 

djgpp/Makefile.maint

@@ -1,37 +0,0 @@
-# DJGPP Maintainer's Makefile                                    -*-Makefile-*-
-# Requires GNU sed
-
-## Copyright (C) 2005-2015, 2018 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) 2005-2015, 2018 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 determined 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) 2005-2015, 2018 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 DependecyTracking
-if "%1" == "DEP" goto DependecyTracking
-goto LibiconvPrefixOption
-:DependecyTracking
-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 illicit 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 illicit 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) 2005-2015, 2018 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) 2005-2015, 2018 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) 2005-2015, 2018 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) 2005-2015, 2018 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) 2005-2015, 2018 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

@@ -16,6 +16,7 @@
 /bison.help
 /bison.html
 /bison.info
+/bison.info.bak
 /bison.log
 /bison.pdf
 /bison.ps
@@ -30,3 +31,6 @@
 /stamp-vti
 /version.texi
 /yacc.1
+/relocatable.texi
+/figs/*.eps
+/figs/*.svg

doc/local.mk

@@ -1,5 +1,5 @@
-## Copyright (C) 2001-2003, 2005-2015, 2018 Free Software Foundation,
+## Copyright (C) 2001-2003, 2005-2015, 2018-2020 Free Software
-## Inc.
+## 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
@@ -14,12 +14,18 @@
 ## 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
+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 = doc/bison.texi
 doc_bison_TEXINFOS =                            \
   $(CROSS_OPTIONS_TEXI)                         \
   doc/fdl.texi                                  \
-  doc/gpl-3.0.texi
+  doc/gpl-3.0.texi                              \
+  doc/relocatable.texi
 
 # Cannot express dependencies directly on file names because of Automake.
 # Obfuscate with a variable.
@@ -27,7 +33,7 @@ doc_bison = doc/bison
 $(doc_bison).dvi: $(FIGS_GV:.gv=.eps)
 $(doc_bison).info: $(FIGS_GV:.gv=.txt)
 $(doc_bison).pdf: $(FIGS_GV:.gv=.pdf)
-$(doc_bison).html: $(FIGS_GV:.gv=.png)
+$(doc_bison).html: $(FIGS_GV:.gv=.svg)
 
 TEXI2DVI = texi2dvi --build-dir=doc/bison.t2d -I doc
 CLEANDIRS += doc/bison.t2d
@@ -48,6 +54,23 @@ $(CROSS_OPTIONS_TEXI): doc/bison.help $(CROSS_OPTIONS_PL)
 	$(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: $(srcdir)/$(doc_bison).info.bak
+$(srcdir)/$(doc_bison).info.bak: $(srcdir)/$(doc_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;' $(srcdir)/$(doc_bison).info
+	@ touch $@
+EXTRA_DIST += $(srcdir)/$(doc_bison).info.bak
+MAINTAINERCLEANFILES += $(srcdir)/$(doc_bison).info.bak
+
+
 ## ---------- ##
 ## Ref card.  ##
 ## ---------- ##
@@ -87,11 +110,13 @@ EXTRA_DIST += $(top_srcdir)/doc/bison.help
 if ! CROSS_COMPILING
 MAINTAINERCLEANFILES += $(top_srcdir)/doc/bison.help
 $(top_srcdir)/doc/bison.help: src/bison$(EXEEXT)
-	$(AM_V_GEN)LC_ALL=C src/bison$(EXEEXT) --version >doc/bison.help.tmp
+	$(AM_V_GEN)LC_ALL=C tests/bison --version >doc/bison.help.tmp
-	$(AM_V_at) LC_ALL=C src/bison$(EXEEXT) --help | \
+	$(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.
-	  sed '/translation bugs/d'  >>doc/bison.help.tmp
+	      -e '/translation bugs/d'  >>doc/bison.help.tmp
 	$(AM_V_at)$(top_srcdir)/build-aux/move-if-change doc/bison.help.tmp $@
 endif ! CROSS_COMPILING
 
@@ -117,7 +142,7 @@ endif
 $(top_srcdir)/doc/bison.1: $(MAN_DEPS)
 	$(AM_V_GEN)$(HELP2MAN)			\
 	    --include=$(top_srcdir)/doc/bison.x	\
-	    --output=$@.tmp src/bison$(EXEEXT)
+	    --output=$@.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 $@;								\
@@ -134,14 +159,14 @@ endif
 ## Graphviz examples generation. ##
 ## ----------------------------- ##
 
-CLEANFILES += $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.png)
+CLEANFILES += $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.svg)
 FIGS_GV =                                               \
   doc/figs/example.gv                                   \
   doc/figs/example-reduce.gv doc/figs/example-shift.gv
 EXTRA_DIST +=                                                   \
   $(FIGS_GV) $(FIGS_GV:.gv=.txt)                                \
-  $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.png)
+  $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.svg)
-SUFFIXES += .gv .eps .pdf .png
+SUFFIXES += .gv .eps .pdf .svg
 
 .gv.eps:
 	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
@@ -153,9 +178,9 @@ SUFFIXES += .gv .eps .pdf .png
 	$(AM_V_at) $(DOT) -Gmargin=0 -Tpdf $< >$@.tmp
 	$(AM_V_at) mv $@.tmp $@
 
-.gv.png:
+.gv.svg:
 	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
-	$(AM_V_at) $(DOT) -Gmargin=0 -Tpng $< >$@.tmp
+	$(AM_V_at) $(DOT) -Gmargin=0 -Tsvg $< >$@.tmp
 	$(AM_V_at) mv $@.tmp $@
 
 ## -------------- ##

doc/refcard.tex

@@ -19,8 +19,8 @@
 \def\finalout{\overfullrule=0pt}
 %\finalout
 
-% Copyright (c) 1998, 2001, 2009-2015, 2018 Free Software Foundation,
+% Copyright (c) 1998, 2001, 2009--2015, 2018--2020 Free Software
-% Inc.
+% Foundation, Inc.
 %
 % This file is part of Bison.
 %
@@ -358,7 +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
@@ -401,16 +401,16 @@ Rules take the form:
 
 \vskip -\baselineskip
 \beginexample
-     non-terminal : {\it statement} 1
+     nonterminal : {\it statement} 1
-                  | {\it statement} 2
+                 | {\it statement} 2
-                      \vdots
+                     \vdots
-                  | {\it statement n}
+                 | {\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/README

@@ -16,7 +16,7 @@ straightforward use of _build/src/bison would.)
 
 --
 
-Copyright (C) 2006, 2009-2015, 2018 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.
 

etc/bench.pl.in

@@ -1,6 +1,7 @@
 #! /usr/bin/perl -w
 
-# Copyright (C) 2006, 2008-2015, 2018 Free Software Foundation, Inc.
+# Copyright (C) 2006, 2008-2015, 2018-2020 Free Software Foundation,
+# Inc.
 #
 # This file is part of Bison, the GNU Compiler Compiler.
 #

etc/local.mk

@@ -1,4 +1,5 @@
-## Copyright (C) 2006, 2008-2015, 2018 Free Software Foundation, Inc.
+## Copyright (C) 2006, 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

examples/README

@@ -1,54 +0,0 @@
-This directory contains examples of Bison grammar files.
-
-Most of them come from the documentation, which should be installed together
-with Bison.  The URLs are provided for convenience.
-
-
-* Examples in C
-
-** rpcalc - Reverse Polish Notation Calculator
-The first example is that of a simple double-precision Reverse Polish
-Notation calculator (a calculator using postfix operators). This example
-provides a good starting point, since operator precedence is not an issue.
-
-Extracted from the documentation: "Reverse Polish Notation Calculator"
-https://www.gnu.org/software/bison/manual/html_node/RPN-Calc.html
-
-** mfcalc - Multi-Function Calculator
-A more complete C example: a multi-function calculator.
-
-Extracted from the documentation: "Multi-Function Calculator: mfcalc".
-https://www.gnu.org/software/bison/manual/html_node/Multi_002dfunction-Calc.html
-
-
-
-* Examples in C++
-
-** c++ - A directory of simple C++ examples
-
-** calc++ - A Complete C++ Example
-A fully featured C++ version of the canonical example for parsers: a
-calculator.  Also uses Flex for the scanner.
-
-Extracted from the documentation: "A Complete C++ Example".
-https://www.gnu.org/software/bison/manual/html_node/A-Complete-C_002b_002b-Example.html
-
-
------
-
-Local Variables:
-mode: outline
-fill-column: 76
-ispell-dictionary: "american"
-End:
-
-Copyright (C) 2018 Free Software Foundation, Inc.
-
-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.
-
-# LocalWords:  mfcalc calc parsers yy

examples/README.md

@@ -0,0 +1,28 @@
+This directory contains examples of Bison grammar files, sorted per
+language.
+
+Several of them come from the documentation, which should be installed
+together with Bison.  The URLs are provided for convenience.
+
+These examples come with a README and a Makefile.  Not only can they be used
+to toy with Bison, they can also be starting points for your own grammars.
+
+Please, be sure to read the C examples before looking at the other
+languages, as these examples are simpler.
+
+<!---
+
+Local Variables:
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+Copyright (C) 2018-2020 Free Software Foundation, Inc.
+
+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.
+--->

examples/c++/.gitignore

@@ -0,0 +1 @@
+/simple.yy

examples/c++/README.md

@@ -1,11 +1,11 @@
-This directory contains examples of Bison grammar files in C++.
+# Examples in C++
 
-* Examples in C++
+This directory contains examples of Bison grammar files in C++.
 
 You can run `make` to compile these examples.  And `make clean` to tidy
 afterwards.
 
-** simple.yy - Simple example in C++14
+## simple.yy - Simple example in C++14
 A very simple example in C++, based on variants and symbol constructors.
 Variants allow to use any C++ type as semantic value type, and symbol
 constructors ensure consistency between declared token type and effective
@@ -16,26 +16,37 @@ Run as `./simple`.
 Extracted from the documentation: "A Simple C++ Example".
 https://www.gnu.org/software/bison/manual/html_node/A-Simple-C_002b_002b-Example.html
 
-** variant.yy - Self-contained example in C++98
+## variant.yy - Self-contained example in C++98
 A variation of simple.yy, in C++98.
 
 Run as `./variant`.
 
-** variant-11.yy - Self-contained example in modern C++
+## variant-11.yy - Self-contained example in modern C++
 Another variation of simple.yy, closely related to the previous one, but
 exhibiting support for C++11's move semantics.
 
 Run as `./variant` or `./variant NUMBER`.
 
------
+## calc++ - A Complete C++ Example
+A fully featured C++ version of the canonical example for parsers: a
+calculator.  Also uses Flex for the scanner.
+
+Don't look at this example first: it is fully featured and can serve as a
+starting point for a clean parser in C++.  The previous examples are better
+introductory examples, and the C examples are also useful introductory
+examples.
+
+Extracted from the documentation: "A Complete C++ Example".
+https://www.gnu.org/software/bison/manual/html_node/A-Complete-C_002b_002b-Example.html
+
+<!---
 
 Local Variables:
-mode: outline
 fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018 Free Software Foundation, Inc.
+Copyright (C) 2018-2020 Free Software Foundation, Inc.
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -45,3 +56,4 @@ Texts.  A copy of the license is included in the "GNU Free
 Documentation License" file as part of this distribution.
 
 # LocalWords:  mfcalc calc parsers yy ispell american
+--->

examples/c++/calc++/Makefile

@@ -0,0 +1,41 @@
+# This Makefile is designed to be simple and readable.  It does not
+# aim at portability.  It requires GNU Make.
+
+BASE = calc++
+BISON = bison
+CXX = g++
+FLEX = flex
+XSLTPROC = xsltproc
+
+all: $(BASE)
+
+%.cc %.hh %.xml %.gv: %.yy
+	$(BISON) $(BISONFLAGS) --xml --graph=$*.gv -o $*.cc $<
+
+%.cc: %.ll
+	$(FLEX) $(FLEXFLAGS) -o$@ $<
+
+%.o: %.cc
+	$(CXX) $(CXXFLAGS) -c -o$@ $<
+
+$(BASE): $(BASE).o driver.o parser.o scanner.o
+	$(CXX) -o $@ $^
+
+$(BASE).o: parser.hh
+parser.o: parser.hh
+scanner.o: parser.hh
+
+run: $(BASE)
+	@echo "Type arithmetic expressions.  Quit with ctrl-d."
+	./$< -
+
+html: parser.html
+%.html: %.xml
+	$(XSLTPROC) $(XSLTPROCFLAGS) -o $@ $$($(BISON) --print-datadir)/xslt/xml2xhtml.xsl $<
+
+CLEANFILES =										\
+  $(BASE) *.o										\
+  parser.hh parser.cc parser.output parser.xml parser.html parser.gv location.hh	\
+  scanner.cc
+clean:
+	rm -f $(CLEANFILES)

examples/c++/calc++/README.md

@@ -1,6 +1,10 @@
-This directory contains calc++, a simple Bison grammar file in C++.
+# calc++ - A Flex+Bison calculator
 
-Please, read the corresponding chapter in the documentation: "A Complete C++
+This directory contains calc++, a Bison grammar file in C++.  If you never
+saw the traditional implementation in C, please first read
+examples/c/lexcalc, which can be seen as a C precursor of this example.
+
+Read the corresponding chapter in the documentation: "A Complete C++
 Example".  It is also available on line (maybe with a different version of
 Bison):
 https://www.gnu.org/software/bison/manual/html_node/A-Complete-C_002b_002b-Example.html
@@ -13,6 +17,7 @@ evaluate.
 The program calc++ expects the file to parse as argument; pass `-` to read
 the standard input (and then hit <Ctrl-d>, control-d, to end your input).
 
+```
 $ ./calc++ -
 one := 1
 two := 2
@@ -20,19 +25,18 @@ three := 3
 (one + two * three) * two * three
 <Ctrl-d>
 42
+```
 
 You may pass `-p` to activate the parser debug traces, and `-s` to activate
 the scanner's.
 
------
+<!---
-
 Local Variables:
-mode: outline
 fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 2018 Free Software Foundation, Inc.
+Copyright (C) 2018-2020 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
@@ -49,4 +53,5 @@ 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:  mfcalc calc parsers yy MERCHANTABILITY Ctrl ispell american
+# LocalWords:  calc parsers yy MERCHANTABILITY Ctrl ispell american
+--->

examples/c++/calc++/calc++.test

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2005-2015, 2018 Free Software Foundation, Inc.
+# Copyright (C) 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

examples/c++/calc++/local.mk

@@ -1,5 +1,5 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018 Free Software Foundation,
+## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
-## Inc.
+## 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
@@ -18,9 +18,7 @@
 ## Parser generation.  ##
 ## ------------------- ##
 
-# Don't depend on $(BISON) otherwise we would rebuild these files
+%D%/parser.stamp: $(dependencies)
-# in srcdir, including during distcheck, which is forbidden.
-%D%/parser.stamp: $(BISON_IN)
 SUFFIXES += .yy .stamp
 .yy.stamp:
 	$(AM_V_YACC)rm -f $@
@@ -33,6 +31,7 @@ $(calcxx_sources_generated): %D%/parser.stamp
 	@test -f $@ || $(MAKE) $(AM_MAKEFLAGS) %D%/parser.stamp
 CLEANFILES +=					\
   $(calcxx_sources_generated)			\
+  %D%/parser.dot				\
   %D%/parser.output				\
   %D%/parser.stamp				\
   %D%/scanner.cc
@@ -79,6 +78,6 @@ EXTRA_DIST += %D%/calc++.test
 ## Installing.  ##
 ## ------------ ##
 
-calcxxdir = $(docdir)/examples/calc++
+calcxxdir = $(docdir)/%D%
 calcxx_DATA = $(calcxx_extracted)
-dist_calcxx_DATA = %D%/README %D%/Makefile
+dist_calcxx_DATA = %D%/README.md %D%/Makefile

examples/c++/local.mk

@@ -1,4 +1,4 @@
-## Copyright (C) 2018 Free Software Foundation, Inc.
+## 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
@@ -13,7 +13,8 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-cxxdir = $(examplesdir)/c++
+cxxdir = $(docdir)/%D%
+include %D%/calc++/local.mk
 
 ## -------- ##
 ## Simple.  ##
@@ -36,7 +37,7 @@ if ENABLE_CXX14
   # Don't use gnulib's system headers.
   %C%_simple_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/simple.test
-  %D%/simple.cc: $(BISON_IN) $(dist_pkgdata_DATA)
+  %D%/simple.cc: $(dependencies)
 endif
 EXTRA_DIST += %D%/simple.test
 
@@ -51,7 +52,7 @@ if ENABLE_CXX
   # Don't use gnulib's system headers.
   %C%_variant_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/variant.test
-  %D%/variant.cc: $(BISON_IN) $(dist_pkgdata_DATA)
+  %D%/variant.cc: $(dependencies)
 endif
 EXTRA_DIST += %D%/variant.test
 
@@ -62,9 +63,11 @@ if ENABLE_CXX11
   # Don't use gnulib's system headers.
   %C%_variant_11_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/variant-11.test
-  %D%/variant-11.cc: $(BISON_IN) $(dist_pkgdata_DATA)
+  %D%/variant-11.cc: $(dependencies)
 endif
 EXTRA_DIST += %D%/variant-11.test
 
-dist_cxx_DATA = %D%/README %D%/Makefile %D%/variant.yy %D%/variant-11.yy
+dist_cxx_DATA = %D%/README.md %D%/Makefile %D%/variant.yy %D%/variant-11.yy
-CLEANFILES += %D%/simple.output %D%/variant.output %D%/variant-11.output
+CLEANFILES +=                                                   \
+  %D%/simple.output %D%/variant.output %D%/variant-11.output    \
+  %D%/simple.hh %D%/variant.hh %D%/variant-11.hh

examples/c++/variant-11.test

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018 Free Software Foundation, Inc.
+# 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

examples/c++/variant-11.yy

@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018 Free Software Foundation, Inc.
+  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
@@ -117,7 +117,7 @@ namespace yy
     static int count = 0;
     const int stage = count;
     ++count;
-    auto loc = parser::location_type{nullptr, unsigned (stage + 1), unsigned (stage + 1)};
+    auto loc = parser::location_type{nullptr, stage + 1, stage + 1};
     if (stage == 0)
       return parser::make_TEXT (make_string_uptr ("I have numbers for you."), std::move (loc));
     else if (stage < max)

examples/c++/variant.test

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018 Free Software Foundation, Inc.
+# 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

examples/c++/variant.yy

@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018 Free Software Foundation, Inc.
+  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
@@ -117,7 +117,7 @@ namespace yy
     static int count = 0;
     const int stage = count;
     ++count;
-    parser::location_type loc (NULLPTR, unsigned (stage + 1), unsigned (stage + 1));
+    parser::location_type loc (NULLPTR, stage + 1, stage + 1);
     switch (stage)
       {
       case 0:

examples/c/README.md

@@ -0,0 +1,59 @@
+# Examples in C
+
+This directory contains simple examples of Bison grammar files in C.
+
+Some of them come from the documentation, which should be installed together
+with Bison.  The URLs are provided for convenience.
+
+## rpcalc - Reverse Polish Notation Calculator
+The first example is that of a simple double-precision Reverse Polish
+Notation calculator (a calculator using postfix operators). This example
+provides a good starting point, since operator precedence is not an issue.
+
+Extracted from the documentation: "Reverse Polish Notation Calculator"
+https://www.gnu.org/software/bison/manual/html_node/RPN-Calc.html
+
+## calc - Simple Calculator
+This example is slightly more complex than rpcalc: it features infix
+operators (`1 + 2`, instead of `1 2 +` in rpcalc), but it does so using a
+unambiguous grammar of the arithmetic instead of using precedence
+directives (%left, etc.).
+
+## mfcalc - Multi-Function Calculator
+A more complete C example: a multi-function calculator.  More complex than
+the previous example.  Using precedence directives to support infix
+operators.
+
+Extracted from the documentation: "Multi-Function Calculator: mfcalc".
+https://www.gnu.org/software/bison/manual/html_node/Multi_002dfunction-Calc.html
+
+## lexcalc - calculator with Flex and Bison
+The calculator, redux.  This time using a scanner generated by Flex.
+
+## reccalc - recursive calculator with Flex and Bison
+The example builds on top of the previous one to provide a reentrant parser.
+Such parsers can be called concurrently in different threads, or even
+recursively.  To demonstrate this feature, expressions in parentheses are
+tokenized as strings, and then recursively parsed from the parser.  So
+`(((1)+(2))*((3)+(4)))` uses eight parsers, with a depth of four.
+
+
+<!---
+
+Local Variables:
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+Copyright (C) 2018-2020 Free Software Foundation, Inc.
+
+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.
+
+# LocalWords:  mfcalc calc parsers yy rpcalc lexcalc redux reccalc ispell
+# LocalWords:  reentrant tokenized american postfix
+--->

examples/c/calc/Makefile

@@ -0,0 +1,28 @@
+# This Makefile is designed to be simple and readable.  It does not
+# aim at portability.  It requires GNU Make.
+
+BASE = calc
+BISON = bison
+XSLTPROC = xsltproc
+
+all: $(BASE)
+
+%.c %.h %.xml %.gv: %.y
+	$(BISON) $(BISONFLAGS) --defines --xml --graph=$*.gv -o $*.c $<
+
+$(BASE): $(BASE).o
+	$(CC) $(CFLAGS) -o $@ $^
+
+run: $(BASE)
+	@echo "Type arithmetic expressions.  Quit with ctrl-d."
+	./$<
+
+html: $(BASE).html
+%.html: %.xml
+	$(XSLTPROC) $(XSLTPROCFLAGS) -o $@ $$($(BISON) --print-datadir)/xslt/xml2xhtml.xsl $<
+
+CLEANFILES =									\
+  $(BASE) *.o $(BASE).[ch] $(BASE).output $(BASE).xml $(BASE).html $(BASE).gv
+
+clean:
+	rm -f $(CLEANFILES)

examples/c/calc/README.md

@@ -0,0 +1,28 @@
+# calc - calculator with Bison
+
+This directory contains calc, the traditional example of using Bison to
+build a simple calculator.
+
+<!---
+Local Variables:
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+Copyright (C) 2019-2020 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/>.
+--->

examples/c/calc/calc.test

@@ -1,23 +1,37 @@
-# DJGPP specific configuration file.
+#! /bin/sh
-# Sed script for additional DJGPP specific editing
+
-# of the testsuite script generated by autoconf 2.61.
+# Copyright (C) 2019-2020 Free Software Foundation, Inc.
-
+#
-# Copyright (C) 2007-2015, 2018 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
-# This program is free software: you can redistribute it and/or modify
+# the Free Software Foundation, either version 3 of the License, or
-# it under the terms of the GNU General Public License as published by
+# (at your option) any later version.
-# 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
-# This program is distributed in the hope that it will be useful,
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# GNU General Public License for more details.
-# 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/>.
+cat >input <<EOF
-
+1+2*3
-
+EOF
-# Remove disallowed characters from file names.
+run 0 7
-
+
-s/~!@#\\\$%^&\*()-=_+{}\[\]|\\\\:;<>, ./~!@#\\$%^\&()-=_+{}[];, ./g
+cat >input <<EOF
+1 - 2 - 3
+EOF
+run 0 -4
+
+cat >input <<EOF
+8 / 2 / 2
+EOF
+run 0 2
+
+cat >input <<EOF
+(1+2) * 3
+EOF
+run 0 9
+run -noerr 0 9 -p

examples/c/calc/calc.y

@@ -0,0 +1,93 @@
+%code top {
+  #include <ctype.h>  /* isdigit. */
+  #include <stdio.h>  /* For printf, etc. */
+  #include <string.h> /* strcmp. */
+
+  int yylex (void);
+  void yyerror (char const *);
+}
+
+%define api.header.include {"calc.h"}
+%define api.value.type union /* Generate YYSTYPE from these types:  */
+%token <double> NUM "number"
+%type  <double> expr term fact
+
+/* Generate the parser description file.  */
+%verbose
+/* Enable run-time traces (yydebug).  */
+%define parse.trace
+
+/* Formatting semantic values.  */
+%printer { fprintf (yyo, "%g", $$); } <double>;
+
+%% /* The grammar follows.  */
+input:
+  %empty
+| input line
+;
+
+line:
+  '\n'
+| expr '\n'  { printf ("%.10g\n", $1); }
+| error '\n' { yyerrok; }
+;
+
+expr:
+  expr '+' term { $$ = $1 + $3; }
+| expr '-' term { $$ = $1 - $3; }
+| term
+;
+
+term:
+  term '*' fact { $$ = $1 * $3; }
+| term '/' fact { $$ = $1 / $3; }
+| fact
+;
+
+fact:
+  "number"
+| '(' expr ')' { $$ = $2; }
+;
+
+%%
+
+int
+yylex (void)
+{
+  int c;
+
+  /* Ignore white space, get first nonwhite character.  */
+  while ((c = getchar ()) == ' ' || c == '\t')
+    continue;
+
+  if (c == EOF)
+    return 0;
+
+  /* Char starts a number => parse the number.         */
+  if (c == '.' || isdigit (c))
+    {
+      ungetc (c, stdin);
+      scanf ("%lf", &yylval.NUM);
+      return NUM;
+    }
+
+  /* Any other character is a token by itself.        */
+  return c;
+}
+
+/* Called by yyparse on error.  */
+void
+yyerror (char const *s)
+{
+  fprintf (stderr, "%s\n", s);
+}
+
+int
+main (int argc, char const* argv[])
+{
+  /* Enable parse traces on option -p.  */
+  for (int i = 1; i < argc; ++i)
+    if (!strcmp (argv[i], "-p"))
+      yydebug = 1;
+  return yyparse ();
+}

examples/c/calc/local.mk

@@ -0,0 +1,33 @@
+## 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 <http://www.gnu.org/licenses/>.
+
+calcdir = $(docdir)/%D%
+
+## ------ ##
+## Calc.  ##
+## ------ ##
+
+check_PROGRAMS += %D%/calc
+TESTS += %D%/calc.test
+EXTRA_DIST += %D%/calc.test
+nodist_%C%_calc_SOURCES = %D%/calc.y
+%D%/calc.c: $(dependencies)
+
+# Don't use gnulib's system headers.
+%C%_calc_CPPFLAGS = -I$(top_srcdir)/%D% -I$(top_builddir)/%D%
+
+dist_calc_DATA = %D%/calc.y %D%/Makefile %D%/README.md
+CLEANFILES += %D%/calc.[ch] %D%/calc.output %D%/scan.c
+CLEANDIRS += %D%/*.dSYM

examples/c/lexcalc/Makefile

@@ -0,0 +1,34 @@
+# This Makefile is designed to be simple and readable.  It does not
+# aim at portability.  It requires GNU Make.
+
+BASE = lexcalc
+BISON = bison
+FLEX = flex
+XSLTPROC = xsltproc
+
+all: $(BASE)
+
+%.c %.h %.xml %.gv: %.y
+	$(BISON) $(BISONFLAGS) --defines --xml --graph=$*.gv -o $*.c $<
+
+%.c: %.l
+	$(FLEX) $(FLEXFLAGS) -o$@ $<
+
+scan.o: parse.h
+$(BASE): parse.o scan.o
+	$(CC) $(CFLAGS) -o $@ $^
+
+run: $(BASE)
+	@echo "Type arithmetic expressions.  Quit with ctrl-d."
+	./$<
+
+html: parse.html
+%.html: %.xml
+	$(XSLTPROC) $(XSLTPROCFLAGS) -o $@ $$($(BISON) --print-datadir)/xslt/xml2xhtml.xsl $<
+
+CLEANFILES =						\
+  $(BASE) *.o						\
+  parse.[ch] parse.output parse.xml parse.html parse.gv	\
+  scan.c
+clean:
+	rm -f $(CLEANFILES)

examples/c/lexcalc/README.md

@@ -0,0 +1,28 @@
+# lexcalc - calculator with Flex and Bison
+
+This directory contains lexcalc, the traditional example of using Flex and
+Bison to build a simple calculator.
+
+<!---
+Local Variables:
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+Copyright (C) 2018-2020 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/>.
+--->

examples/c/lexcalc/lexcalc.test

@@ -1,7 +1,7 @@
-# sed script for DJGPP specific editing of config.hin
+#! /bin/sh
-
-# Copyright (C) 2005-2015, 2018 Free Software Foundation, Inc.
 
+# 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
@@ -15,14 +15,18 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+cat >input <<EOF
+1+2*3
+EOF
+run 0 7
 
-$ a\
+cat >input <<EOF
-\
+(1+2) * 3
-\
+EOF
-/* DJGPP specific defines.  */\
+run 0 9
-\
+run -noerr 0 9 -p
-#include <unistd.h>\
+
-#define TAB_EXT     ((pathconf(NULL, _PC_NAME_MAX) > 12) ? ".tab" : "_tab")\
+cat >input <<EOF
-#define OUTPUT_EXT  ((pathconf(NULL, _PC_NAME_MAX) > 12) ? ".output" : ".out")\
+(1+2) *
-\
+EOF
-#define DEFAULT_TMPDIR  "/dev/env/DJDIR/tmp"
+run 1 'err: syntax error, unexpected end-of-line, expecting ( or number'

examples/c/lexcalc/local.mk

@@ -0,0 +1,35 @@
+## 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/>.
+
+lexcalcdir = $(docdir)/%D%
+
+## --------- ##
+## LexCalc.  ##
+## --------- ##
+
+if FLEX_WORKS
+  check_PROGRAMS += %D%/lexcalc
+  TESTS += %D%/lexcalc.test
+  nodist_%C%_lexcalc_SOURCES = %D%/parse.y %D%/parse.h %D%/scan.l
+  # Don't use gnulib's system headers.
+  %C%_lexcalc_CPPFLAGS = -I$(top_srcdir)/%D% -I$(top_builddir)/%D%
+endif FLEX_WORKS
+
+%D%/parse.c: $(dependencies)
+
+EXTRA_DIST += %D%/lexcalc.test
+dist_lexcalc_DATA = %D%/parse.y %D%/scan.l %D%/Makefile %D%/README.md
+CLEANFILES += %D%/parse.[ch] %D%/scan.c %D%/parse.output
+CLEANDIRS += %D%/*.dSYM

examples/c/lexcalc/parse.y

@@ -0,0 +1,94 @@
+// Prologue (directives).
+%expect 0
+
+// Emitted in the header file, after the definition of YYSTYPE.
+%code provides
+{
+  // Tell Flex the expected prototype of yylex.
+#define YY_DECL                                 \
+  enum yytokentype yylex (YYSTYPE* yylval, int *nerrs)
+  YY_DECL;
+
+  void yyerror (int *nerrs, const char *msg);
+}
+
+// Emitted on top of the implementation file.
+%code top
+{
+#include <stdio.h>  // printf.
+#include <stdlib.h> // getenv.
+}
+
+%define api.pure full
+%define api.token.prefix {TOK_}
+%define api.value.type union
+%define parse.error verbose
+%define parse.trace
+ // Error count, exchanged between main, yyparse and yylex.
+%param {int *nerrs}
+
+%token
+  PLUS   "+"
+  MINUS  "-"
+  STAR   "*"
+  SLASH  "/"
+  LPAREN "("
+  RPAREN ")"
+  EOL    "end-of-line"
+  EOF 0  "end-of-file"
+;
+
+%token <int> NUM "number"
+%type <int> exp
+%printer { fprintf (yyo, "%d", $$); } <int>
+
+// Precedence (from lowest to highest) and associativity.
+%left "+" "-"
+%left "*" "/"
+
+%%
+// Rules.
+input:
+  %empty
+| input line
+;
+
+line:
+  exp EOL   { printf ("%d\n", $exp); }
+| error EOL { yyerrok; }
+;
+
+exp:
+  exp "+" exp   { $$ = $1 + $3; }
+| exp "-" exp   { $$ = $1 - $3; }
+| exp "*" exp   { $$ = $1 * $3; }
+| exp "/" exp
+  {
+    if ($3 == 0)
+      {
+        yyerror (nerrs, "invalid division by zero");
+        YYERROR;
+      }
+    else
+      $$ = $1 / $3;
+  }
+| "(" exp ")"   { $$ = $2; }
+| NUM           { $$ = $1; }
+;
+%%
+// Epilogue (C code).
+void yyerror (int *nerrs, const char *msg)
+{
+  fprintf (stderr, "%s\n", msg);
+  ++*nerrs;
+}
+
+int main (void)
+{
+  int nerrs = 0;
+  // Possibly enable parser runtime debugging.
+  yydebug = !!getenv ("YYDEBUG");
+  yyparse (&nerrs);
+  // Exit on failure if there were errors.
+  return !!nerrs;
+}

examples/c/lexcalc/scan.l

@@ -0,0 +1,44 @@
+/* Prologue (directives).   -*- C++ -*- */
+
+/* Disable Flex features we don't need, to avoid warnings. */
+%option nodefault noinput nounput noyywrap
+
+%{
+#include <errno.h> /* errno, ERANGE */
+#include <limits.h> /* INT_MIN */
+#include <stdlib.h> /* strtol */
+
+#include "parse.h"
+%}
+
+%%
+ /* Rules.  */
+
+"+"      return TOK_PLUS;
+"-"      return TOK_MINUS;
+"*"      return TOK_STAR;
+"/"      return TOK_SLASH;
+
+"("      return TOK_LPAREN;
+")"      return TOK_RPAREN;
+
+ /* Scan an integer.  */
+[0-9]+   {
+  errno = 0;
+  long n = strtol (yytext, NULL, 10);
+  if (! (INT_MIN <= n && n <= INT_MAX && errno != ERANGE))
+    yyerror (nerrs, "integer is out of range");
+  yylval->TOK_NUM = (int) n;
+  return TOK_NUM;
+}
+
+ /* Ignore white spaces. */
+[ \t]+   continue;
+
+"\n"     return TOK_EOL;
+
+.        yyerror (nerrs, "syntax error, invalid character");
+
+<<EOF>>  return TOK_EOF;
+%%
+/* Epilogue (C code). */