version 3.2.2

* NEWS: Record release date.

.gitignore

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

.prev-version

@@ -1 +1 @@
-3.6.93
+3.2.1

.travis.yml

@@ -1,532 +1,317 @@
-version: ~> 1.0
+# Travis defines and exports CC and CXX *after* we have defined our
+# 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.
 
-# 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
+language: cpp
 
-# Run in two steps:
-# 1. Build the tarball
-#    On a modern distro, with all the needed dependencies, including the whole git history.
-# 2. Check it on various environments.
-#    Less dependencies, and little git content (we would like to have none, but it's not
-#    an option on Travis).
-stages:
-  - dist
-  - check
+env:
+  global:
+    # ICC serial number.
+    secure: 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
 
-# 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:
+matrix:
   include:
-    - stage: dist
-      name: "Make dist"
-      git:
-        clone: true
-      dist: bionic
-      script:
-        - sudo apt-get install -qq autoconf automake autopoint flex gettext gperf graphviz help2man m4 texinfo
-        - autoconf --version
-        - automake --version
-        - autopoint --version
-        - dot -V
-        - gettext --version
-        - gperf --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-xz
-        # Can help understanding why we get "dirty" tarballs.
-        - git status
-        - dist=$(echo bison*.xz)
-
-        # Unfortunately we cannot deterministically know the name of the tarball without the full
-        # git history (because git describe --abbrev=4 may use more than 4 characters if there are
-        # conflicts).
-        #
-        # So for the sake of the 'check' jobs (that don't even have the repo at all), also expose this
-        # tarball on a name that only depends on the Travis build number.
-        #
-        # Without -b -, exit status is always 0.
-        #
-        # If we rerun a job that was already uploaded, 'ln -s' will fail: remove beforehand.
-        - sftp -b - [email protected] <<< "put $dist"$'\n'"-rm bison-$TRAVIS_BUILD_NUMBER.tar.xz"$'\n'"ln -s $dist bison-$TRAVIS_BUILD_NUMBER.tar.xz"
-
     ## ------- ##
     ## First.  ##
     ## ------- ##
 
-    # Start with three completely different environments, to get errors asap.
+    # Start with three completely different environments, to get
+    # errors asap.
 
-    - name: "GCC 10 -O3"
-      stage: check
+    - name: "GCC 7 -O3"
       os: linux
-      dist: bionic
-      addons: &gcc10
+      addons:
         apt:
           sources:
-            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-            - sourceline: 'ppa:ubuntu-toolchain-r/test'
-          packages: g++-10
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-7
       env:
-        - CC=gcc-10
-        - CXX=g++-10
-        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
+        - MATRIX_EVAL="CC=gcc-7 && CXX=g++-7 && CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'"
 
     # ASAN is time consuming, and we timeout the 50min granted by
-    # Travis if we run all the tests in one go.  Run in two parts.
-    - name: "Clang 10 libc++ and ASAN part 1"
-      stage: check
+    # Travis if we run all the tests in on go.  Run in two parts.
+    - name: "Clang 7 libc++ and ASAN part 1"
       os: linux
-      dist: bionic
-      addons: &clang10
-        apt:
-          sources:
-            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-            - sourceline: 'ppa:ubuntu-toolchain-r/test'
-            - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-10 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-10
-            - libc++-10-dev
-            - libc++abi-10-dev
-      env:
-        # Do not use ASAN with ubuntu's libc++: https://bugs.llvm.org/show_bug.cgi?id=17379
-        - CC='clang-10 -fsanitize=address'
-        - CXX='clang++-10 -fsanitize=address -stdlib=libc++'
-        - PART=1
-
-    - name: "Clang 10 libc++ and ASAN part 2"
-      stage: check
-      os: linux
-      dist: bionic
-      addons: *clang10
-      env:
-        # Do not use ASAN with ubuntu's libc++: https://bugs.llvm.org/show_bug.cgi?id=17379
-        - CC='clang-10 -fsanitize=address'
-        - CXX='clang++-10 -fsanitize=address -stdlib=libc++'
-        - PART=2
-
-    - name: "ICC"
-      stage: check
-      os: linux
-      compiler: icc
-      env:
-        - CC=icc
-        - CXX=icpc
-      install:
-        - source /opt/intel/inteloneapi/compiler/latest/env/vars.sh
       addons:
         apt:
           sources:
-          - sourceline: 'deb https://apt.repos.intel.com/oneapi all main'
-            key_url: 'https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB'
-          packages:
-          - intel-oneapi-icc
-
-    - name: "ARM64: GCC 10 -O2 part 1"
-      stage: check
-      os: linux
-      arch: arm64
-      dist: bionic
-      addons: *gcc10
-      env:
-        - CC=gcc-10
-        - CXX=g++-10
-        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O2 CXXFLAGS=-O2'
-        - PART=1
-
-    - name: "PPC64le: GCC 10 -O2 part 1"
-      stage: check
-      os: linux
-      arch: ppc64le
-      dist: bionic
-      addons:
-        apt:
-          sources:
-            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-            - sourceline: 'ppa:ubuntu-toolchain-r/test'
-          packages: g++-10
-      env:
-        - CC=gcc-10
-        - CXX=g++-10
-        - CONFIGUREFLAGS='CFLAGS=-O2 CXXFLAGS=-O2'
-        - PART=1
-
-    - name: "s390x: GCC 10 -O2 part 1"
-      stage: check
-      os: linux
-      arch: s390x
-      dist: bionic
-      addons: *gcc10
-      env:
-        - CC=gcc-10
-        - CXX=g++-10
-        - CONFIGUREFLAGS='CFLAGS=-O2 CXXFLAGS=-O2'
-        - PART=1
-
-    ## ----- ##
-    ## GCC.  ##
-    ## ----- ##
-
-    - name: "GCC 9 with sanitizers part 1"
-      stage: check
-      os: linux
-      dist: bionic
-      addons:
-        apt:
-          sources:
-            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-            - sourceline: 'ppa:ubuntu-toolchain-r/test'
-          packages: g++-9
-      env:
-        - CC='gcc-9 -fsanitize=undefined,address -fno-omit-frame-pointer'
-        - CXX='g++-9 -fsanitize=undefined,address -fno-omit-frame-pointer'
-        - CONFIGUREFLAGS='CFLAGS=-O1 CXXFLAGS=-O1'
-        - PART=1
-
-    - name: "GCC 8"
-      stage: check
-      os: linux
-      dist: bionic
-      addons:
-        apt:
-          packages: g++-8
-      env:
-        - CC=gcc-8
-        - CXX=g++-8
-
-    - name: "GCC 7"
-      stage: check
-      os: linux
-      dist: bionic
-      addons:
-        apt:
-          packages: g++-7
-      env:
-        - CC=gcc-7
-        - CXX=g++-7
-
-    - name: "GCC 6"
-      stage: check
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-6
-      env:
-        - CC=gcc-6
-        - CXX=g++-6
-
-    - name: "GCC 5"
-      stage: check
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-5
-      env:
-         - CC=gcc-5
-         - CXX=g++-5
-
-    - name: "GCC 4.9"
-      stage: check
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-4.9
-      env:
-         - CC=gcc-4.9
-         - CXX=g++-4.9
-
-    - name: "GCC 4.8"
-      stage: check
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-4.8
-      env:
-         - CC=gcc-4.8
-         - CXX=g++-4.8
-
-    - name: "GCC 4.7"
-      stage: check
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-4.7
-      env:
-         - CC=gcc-4.7
-         - CXX=g++-4.7
-
-    - name: "GCC 4.6"
-      stage: check
-      os: linux
-      dist: xenial
-      addons:
-        apt:
-          sources: ubuntu-toolchain-r-test
-          packages: g++-4.6
-      env:
-         - CC=gcc-4.6
-         - CXX=g++-4.6
-
-    ## ------- ##
-    ## Clang.  ##
-    ## ------- ##
-
-    - name: "Clang 9 -O3"
-      stage: check
-      os: linux
-      dist: bionic
-      addons:
-        apt:
-          sources:
-            # See https://github.com/travis-ci/apt-source-safelist/issues/410.
-            - sourceline: 'ppa:ubuntu-toolchain-r/test'
-            - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main'
-              key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key'
-          packages:
-            - clang-9
-            - libc++-9-dev
-            - libc++abi-9-dev
-      env:
-        - CC='clang-9'
-        - CXX='clang++-9 -stdlib=libc++'
-        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
-
-    - name: "Clang 8"
-      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++'
-
-    - name: "Clang 7"
-      stage: check
-      os: linux
-      dist: bionic
-      addons:
-        apt:
+            - llvm-toolchain-trusty-7
+            - ubuntu-toolchain-r-test
           packages:
             - clang-7
             - libc++-7-dev
             - libc++abi-7-dev
       env:
-        - CC=clang-7
-        - CXX='clang++-7 -stdlib=libc++'
+        # 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++'"
 
-    - name: "Clang 6 and libc++"
-      stage: check
+    - name: "Clang 7 libc++ and ASAN part 2"
       os: linux
-      dist: xenial
       addons:
         apt:
           sources:
-            - llvm-toolchain-xenial-6.0
+            - 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++'"
+
+    - name: "ICC"
+      os: linux
+      env:
+        # ICC's warnings are often very wrong (e.g., it thinks foo ?
+        # "bar" : "baz" is char* instead of const char*), so don't try
+        # to work around the, and obviously, don't die on them.
+        - MATRIX_EVAL="CC=icc && CXX=icpc"
+        - MAKE_ARGS='WERROR_CFLAGS= WERROR_CXXFLAGS='
+
+
+    ## ----- ##
+    ## GCC.  ##
+    ## ----- ##
+
+    #- name: "GCC 8 with sanitizers"
+    #  os: linux
+    #  addons:
+    #    apt:
+    #      sources:
+    #        - ubuntu-toolchain-r-test
+    #      packages:
+    #        - g++-8
+    #  env:
+    #    # Can't use UBSAN: I get:
+    #    # configure:4951: gcc-8 -fsanitize=undefined,address -fno-omit-frame-pointer conftest.c
+    #    # /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 6"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-6
+      env:
+        - MATRIX_EVAL="CC=gcc-6 && CXX=g++-6"
+
+    - name: "GCC 5"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-5
+      env:
+         - MATRIX_EVAL="CC=gcc-5 && CXX=g++-5"
+
+    - name: "GCC 4.9"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.9
+      env:
+         - MATRIX_EVAL="CC=gcc-4.9 && CXX=g++-4.9"
+
+    - name: "GCC 4.8"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.8
+      env:
+         - MATRIX_EVAL="CC=gcc-4.8 && CXX=g++-4.8"
+
+    - name: "GCC 4.7"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.7
+      env:
+         - MATRIX_EVAL="CC=gcc-4.7 && CXX=g++-4.7"
+
+    - name: "GCC 4.6"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+          packages:
+            - g++-4.6
+      env:
+         - MATRIX_EVAL="CC=gcc-4.6 && CXX=g++-4.6"
+
+    ## ------- ##
+    ## Clang.  ##
+    ## ------- ##
+
+    - name: "Clang 6 -O3 and libc++"
+      os: linux
+      addons:
+        apt:
+          sources:
+            - llvm-toolchain-trusty-6.0
             - ubuntu-toolchain-r-test
           packages:
             - clang-6.0
             - libc++-dev
       env:
-        - CC=clang-6.0
-        - CXX='clang++-6.0 -stdlib=libc++'
+        - MATRIX_EVAL="CC=clang-6.0 && CXX='clang++-6.0 -stdlib=libc++'"
+        - CONFIGUREFLAGS='CPPFLAGS=-DNDEBUG CFLAGS=-O3 CXXFLAGS=-O3'
 
     - name: "Clang 5"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
-          sources: llvm-toolchain-xenial-5.0
+          sources:
+            - llvm-toolchain-trusty-5.0
           packages:
             - clang-5.0
             - libc++-dev
       env:
-        - CC='clang-5.0'
-        - CXX='clang++-5.0'
+        - MATRIX_EVAL="CC='clang-5.0' CXX='clang++-5.0'"
 
     - name: "Clang 4"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
-          sources: llvm-toolchain-xenial-4.0
-          packages: clang-4.0
+          sources:
+            - llvm-toolchain-trusty-4.0
+          packages:
+            - clang-4.0
       env:
-        - CC=clang-4.0
-        - CXX=clang++-4.0
+        - MATRIX_EVAL="CC=clang-4.0 && CXX=clang++-4.0"
 
     - name: "Clang 3.9"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
-          sources: llvm-toolchain-xenial-3.9
-          packages: clang-3.9
+          sources:
+            - llvm-toolchain-trusty-3.9
+          packages:
+            - clang-3.9
       env:
-        - CC=clang-3.9
-        - CXX=clang++-3.9
+        - MATRIX_EVAL="CC=clang-3.9 && CXX=clang++-3.9"
 
     - name: "Clang 3.8"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
           sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.8
-          packages: clang-3.8
+          packages:
+            - clang-3.8
       env:
-        - CC=clang-3.8
-        - CXX=clang++-3.8
+        - MATRIX_EVAL="CC=clang-3.8 && CXX=clang++-3.8"
 
     - name: "CLang 3.7"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
           sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.7
-          packages: clang-3.7
+          packages:
+            - clang-3.7
       env:
-        - CC=clang-3.7
-        - CXX=clang++-3.7
+        - MATRIX_EVAL="CC=clang-3.7 && CXX=clang++-3.7"
 
     - name: "Clang 3.6"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
           sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.6
-          packages: clang-3.6
+          packages:
+            - clang-3.6
       env:
-        - CC=clang-3.6
-        - CXX=clang++-3.6
+        - MATRIX_EVAL="CC=clang-3.6 && CXX=clang++-3.6"
 
     - name: "Clang 3.5"
-      stage: check
       os: linux
-      dist: xenial
       addons:
         apt:
           sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.5
-          packages: clang-3.5
+          packages:
+            - clang-3.5
       env:
-        - CC=clang-3.5
-        - CXX=clang++-3.5
+        - MATRIX_EVAL="CC=clang-3.5 && CXX=clang++-3.5"
 
     - name: "Clang 3.4"
-      stage: check
       os: linux
-      # Not available on Xenial.
-      dist: trusty
       addons:
         apt:
-          packages: clang-3.4
+          packages:
+            - clang-3.4
       env:
         # No versioned name installed, but beware that Travis installs
         # a more modern clang earlier in the default PATH.
-        - CC=/usr/bin/clang
-        - CXX=/usr/bin/clang++
+        - MATRIX_EVAL='CC=/usr/bin/clang && CXX=/usr/bin/clang++'
 
     - name: "Clang 3.3"
-      stage: check
       os: linux
-      # Not available on Xenial.
-      dist: trusty
       addons:
         apt:
-          packages: clang-3.3
+          packages:
+            - clang-3.3
       env:
         # See comment for 3.4.
-        - CC=/usr/bin/clang
-        - CXX=/usr/bin/clang++
+        - MATRIX_EVAL='CC=/usr/bin/clang && CXX=/usr/bin/clang++'
 
-## From https://docs.gitlab.com/ce/ci/ssh_keys/#ssh-keys-when-using-the-docker-executor.
-## Applies to Travis too.  Applied to all the 'script's (of all the jobs).
-before_script:
-  - 'which ssh-agent || ( sudo apt-get install openssh-client -y )'
-  - eval "$(ssh-agent -s)"
-  # $SSH_PRIVATE_KEY is multiline.  Use $'...' to register its value: $'-----BEGIN OPENSSH PRIVATE KEY-----\nXXXXX...\n...==\n-----END OPENSSH PRIVATE KEY-----'.
-  - echo "$SSH_PRIVATE_KEY" >/tmp/key.id_rsa
-  - chmod 600 /tmp/key.id_rsa
-  - ssh-add /tmp/key.id_rsa </dev/null
-  - mkdir -p ~/.ssh
-  - chmod 700 ~/.ssh
-  - echo '|1|bpc51UGxoDZjCPiwRlCStW32trI=|rfh6mLoLZv/vAvOVrpZXI1hTLxg= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBIR+ckMoJTNXHvAQLHWSfrRnrNJGW2ZR6kr5pBVDGCkz1v1RcQ5rleq0NAt9kS3v4hgnuLiEVnK7KDRzcEH3ikc=' >>~/.ssh/known_hosts
-  - chmod 600 ~/.ssh/known_hosts
-
-# Applies only to the jobs that don't have a 'script', i.e., applies to all the 'check' jobs, but not the 'dist' one.
-script:
-  # Beware not too leak $SSH_PRIVATE_KEY.
-  # - env
-  - sudo apt-get install -qq doxygen flex m4
-  # Install and activate dmd.
-  - mkdir -p ~/dlang && wget https://dlang.org/install.sh -O ~/dlang/install.sh
-  - source $(source ~/dlang/install.sh dmd -a) || true
 
+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 || true
   - doxygen --version
   - flex --version
-  - ld --version
+  - gettext --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
-  # Unset this variable, otherwise, Java programs' stderr is cluttered
-  # with `Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m`, which makes
-  # the test suite fail.
-  - unset _JAVA_OPTIONS
-
-  # Fail fast from now on.
-  - set -e
-  - sftp [email protected]:bison-$TRAVIS_BUILD_NUMBER.tar.xz
-  - tar xf bison-$TRAVIS_BUILD_NUMBER.tar.xz
-  - dir=$(tar tf bison-$TRAVIS_BUILD_NUMBER.tar.xz | sed 1q)
-  - cd $dir
-  - mkdir _build
-  - cd _build
-  - ../configure --enable-gcc-warnings CC="$CC" CXX="$CXX" $CONFIGUREFLAGS || { cat config.log && false; }
+  - ./configure --enable-gcc-warnings CC="$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-1} = 1; then make check                  VERBOSE=1 TESTSUITEFLAGS=-j2 || { cat tests/testsuite.log && false; }; fi
+  - if test ${PART-1} = 1; 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
+
+after_script:
+  - if [[ $CC == "icc" ]]; then uninstall_intel_software; fi

AUTHORS

@@ -24,7 +24,7 @@ and nasty bugs.
 
 -----
 
-Copyright (C) 1998-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 1998-2015, 2018 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, 2018-2020 Free Software
+	Copyright (C) 1987-1988, 1991-2015, 2018 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, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 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
@@ -18,7 +18,7 @@
 AUTOMAKE_OPTIONS = subdir-objects
 ACLOCAL_AMFLAGS = -I m4
 
-SUBDIRS = po runtime-po gnulib-po .
+SUBDIRS = po runtime-po .
 
 # Files installed for use by Automake.
 aclocaldir = @aclocaldir@
@@ -29,21 +29,13 @@ 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_WITH_LINES = --defines -Werror -Wall,dangling-alias --report=all
-AM_YFLAGS = $(AM_YFLAGS_WITH_LINES) --no-lines
+AM_YFLAGS = -d -v -Werror -Wall -Wno-yacc --report=all
 
 # Initialization before completion by local.mk's.
 AM_CFLAGS = $(WARN_CFLAGS)
@@ -60,12 +52,12 @@ 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
@@ -88,22 +80,9 @@ clean-local:
 BUILT_SOURCES += $(top_srcdir)/.version
 $(top_srcdir)/.version: configure
 	echo $(VERSION) > $@-t && mv $@-t $@
-dist-hook: gen-ChangeLog gen-synclines
+dist-hook: gen-ChangeLog
 	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 $(srcdir)/data -type f          \
@@ -127,15 +106,3 @@ gen-ChangeLog:
 	    --since=$(gen_start_date) > $$cl.tmp &&	\
 	  mv -f $$cl.tmp $$cl;				\
 	fi
-
-# Useful to debug.
-.c.i:
-	$(CC) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -o $@ -E $<
-
-.PHONY: codespell
-codespell:
-	$(AM_V_GEN) cd $(srcdir) \
-	&& codespell \
-	     --regex "[\\w\\-'’\`]+\+*" \
-	     --ignore-words-list "ba,circularly,cloneable,copyable,define'd,dout,froms,iff,ifset,od,ois" \
-	     $$(git ls-files data doc lib src tests)

PACKAGING

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

README

@@ -1,126 +1,67 @@
-GNU Bison is a general-purpose parser generator that converts an annotated
-context-free grammar into a deterministic LR or generalized LR (GLR) parser
-employing LALR(1) parser tables.  Bison can also generate IELR(1) or
-canonical LR(1) parser tables.  Once you are proficient with Bison, you can
-use it to develop a wide range of language parsers, from those used in
-simple desk calculators to complex programming languages.
+This package contains the GNU Bison parser generator.
 
-Bison is upward compatible with Yacc: all properly-written Yacc grammars
-work with Bison with no change.  Anyone familiar with Yacc should be able to
-use Bison with little trouble.  You need to be fluent in C, C++ or Java
-programming in order to use Bison.
-
-Bison and the parsers it generates are portable, they do not require any
-specific compilers.
-
-GNU Bison's home page is https://gnu.org/software/bison/.
-
-# Installation
-## Build from git
-The [README-hacking.md file](README-hacking.md) is about building, modifying
-and checking Bison.  See its "Working from the Repository" section to build
-Bison from the git repo.  Roughly, run:
-
-    $ git submodule update --init
-    $ ./bootstrap
-
-then proceed with the usual `configure && make` steps.
-
-## Build from tarball
-See the [INSTALL file](INSTALL] for generic compilation and installation
+* Installation
+** Build
+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.
+Bison requires GNU m4 1.4.6 or later.  See:
 
-## Running a non installed bison
-Once you ran `make`, you might want to toy with this fresh bison before
-installing it.  In that case, do not use `src/bison`: it would use the
-*installed* files (skeletons, etc.), not the local ones.  Use `tests/bison`.
+      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/pub/gnu/gettext/libtextstyle-0.20.5.tar.gz.
-
-The option --color supports the following arguments:
-- always, yes: Enable colors.
-- never, no: Disable colors.
-- auto, tty (default): Enable colors if the output device is a tty.
-
-To customize the styles, create a CSS file, say `bison-bw.css`, similar to
-
-    /* bison-bw.css */
-    .warning   { }
-    .error     { font-weight: 800; text-decoration: underline; }
-    .note      { }
-
-then invoke bison with `--style=bison-bw.css`, or set the `BISON_STYLE`
-environment variable to `bison-bw.css`.
-
-## Relocatability
-If you pass `--enable-relocatable` to `configure`, Bison is relocatable.
-
-A relocatable program can be moved or copied to a different location on the
-file system.  It can also be used through mount points for network sharing.
-It is possible to make symlinks to the installed and moved programs, and
-invoke them through the symlink.
-
-See "Enabling Relocatability" in the documentation.
-
-## Internationalization
+** Internationalization
 Bison supports two catalogs: one for Bison itself (i.e., for the
-maintainer-side parser generation), and one for the generated parsers (i.e.,
-for the user-side parser execution).  The requirements between both differ:
-bison needs ngettext, the generated parsers do not.  To simplify the build
-system, neither are installed if ngettext is not supported, even if
-generated parsers could have been localized.  See
-http://lists.gnu.org/archive/html/bug-bison/2009-08/msg00006.html for more
-details.
+maintainer-side parser generation), and one for the generated parsers
+(i.e., for the user-side parser execution).  The requirements between
+both differ: bison needs ngettext, the generated parsers do not.  To
+simplify the build system, neither are installed if ngettext is not
+supported, even if generated parsers could have been localized.  See
+http://lists.gnu.org/archive/html/bug-bison/2009-08/msg00006.html for
+more details.
 
-# Questions
-See the section FAQ in the documentation (doc/bison.info) for frequently
-asked questions.  The documentation is also available in PDF and HTML,
-provided you have a recent version of Texinfo installed: run `make pdf` or
-`make html`.
+* Questions
+See the section FAQ in the documentation (doc/bison.info) for
+frequently asked questions.  The documentation is also available in
+PDF and HTML, provided you have a recent version of Texinfo installed:
+run "make pdf" or "make html".
 
-If you have questions about using Bison and the documentation does not
-answer them, please send mail to <[email protected]>.
+If you have questions about using Bison and the documentation does
+not 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
-For any copyright year range specified as YYYY-ZZZZ in this package, note
-that the range specifies every single year in that closed interval.
+* Copyright statements
+For any copyright year range specified as YYYY-ZZZZ in this package,
+note that the range specifies every single year in that closed interval.
 
-<!--
-
-LocalWords:  parsers ngettext Texinfo pdf html YYYY ZZZZ ispell american md
-LocalWords:  MERCHANTABILITY GLR LALR IELR submodule init README src bw
-LocalWords:  Relocatability symlinks symlink
+-----
 
 Local Variables:
-mode: markdown
+mode: outline
 fill-column: 76
 ispell-dictionary: "american"
 End:
 
-Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2020 Free
-Software Foundation, Inc.
+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.
 
-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.
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
 
--->
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# LocalWords:  parsers ngettext Texinfo pdf html YYYY ZZZZ ispell american
+# LocalWords:  MERCHANTABILITY

README-alpha

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

README-hacking

@@ -0,0 +1,477 @@
+This file attempts to describe the rules to use when hacking Bison.
+Don't put this file into the distribution.
+
+Everything related to the development of Bison is on Savannah:
+
+        http://savannah.gnu.org/projects/bison/
+
+
+* Administrivia
+
+** If you incorporate a change from somebody on the net:
+First, if it is a large change, you must make sure they have signed the
+appropriate paperwork.  Second, be sure to add their name and email address
+to THANKS.
+
+** If a change fixes a test, mention the test in the commit message.
+
+** Bug reports
+If somebody reports a new bug, mention his name in the commit message and in
+the test case you write.  Put him into THANKS.
+
+The correct response to most actual bugs is to write a new test case which
+demonstrates the bug.  Then fix the bug, re-run the test suite, and check
+everything in.
+
+
+* Hacking
+
+** Visible changes
+Which include serious bug fixes, must be mentioned in NEWS.
+
+** Translations
+Only user visible strings are to be translated: error messages, bits of the
+.output file etc.  This excludes impossible error messages (comparable to
+assert/abort), and all the --trace output which is meant for the maintainers
+only.
+
+** 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.
+Also, test cases might need to contain tabs to check that Bison properly
+processes tabs in its input.
+
+
+* Working from the repository
+
+These notes intend to help people working on the checked-out sources.
+These requirements do not apply when building from a distribution tarball.
+
+** Requirements
+
+We've opted to keep only the highest-level sources in the repository.  This
+eases our maintenance burden, (fewer merges etc.), but imposes more
+requirements on anyone wishing to build from the just-checked-out sources.
+For example, you have to use the latest stable versions of the maintainer
+tools we depend upon, including:
+
+- Autoconf <http://www.gnu.org/software/autoconf/>
+- Automake <http://www.gnu.org/software/automake/>
+- Flex <http://www.gnu.org/software/flex/>
+- Gettext <http://www.gnu.org/software/gettext/>
+- Graphviz <http://www.graphviz.org>
+- Gzip <http://www.gnu.org/software/gzip/>
+- Help2man <http://www.gnu.org/software/help2man/>
+- Perl <http://www.cpan.org/>
+- Rsync <http://samba.anu.edu.au/rsync/>
+- Tar <http://www.gnu.org/software/tar/>
+- Texinfo <http://www.gnu.org/software/texinfo/>
+
+Valgrind <http://valgrind.org/> is also highly recommended, if it supports
+your architecture.
+
+If you're using a GNU/Linux distribution, the easiest way to install the
+above packages depends on your system.  The following shell command should
+work for Debian-based systems such as Ubuntu:
+
+  sudo apt-get install \
+    autoconf automake autopoint flex graphviz help2man texinfo valgrind
+
+Bison is written using Bison grammars, so there are bootstrapping issues.
+The bootstrap script attempts to discover when the C code generated from the
+grammars is out of date, and to bootstrap with an out-of-date version of the
+C code, but the process is not foolproof.  Also, you may run into similar
+problems yourself if you modify Bison.
+
+Only building the initial full source tree will be a bit painful.  Later,
+after synchronizing from the repository a plain 'make' should be sufficient.
+Note, however, that when gnulib is updated, running './bootstrap' again
+might be needed.
+
+** First checkout
+
+Obviously, if you are reading these notes, you did manage to check out
+this package from the repository.  For the record, you will find all the
+relevant information on:
+
+        http://savannah.gnu.org/git/?group=bison
+
+Bison uses Git submodules: subscriptions to other Git repositories.
+In particular it uses gnulib, the GNU portability library.  To ask Git
+to perform the first checkout of the submodules, run
+
+       $ git submodule update --init
+
+The next step is to get other files needed to build, which are
+extracted from other source packages:
+
+        $ ./bootstrap
+
+Bootstrapping updates the submodules to the versions registered in the
+top-level directory.  To change gnulib, first check out the version you want
+in `gnulib`, then commit this change in Bison's repository, and finally run
+bootstrap.
+
+If it fails with missing symbols (e.g., "error: possibly undefined macro:
+AC_PROG_GNU_M4"), you are likely to have forgotten the submodule
+initialization part.  Otherwise, there you are!  Just
+
+        $ ./configure
+        $ make
+        $ make check
+
+At this point, there should be no difference between your local copy,
+and the master copy:
+
+        $ git diff
+
+should output no difference.
+
+Enjoy!
+
+** Updating
+
+The use of submodules make things somewhat different because git does
+not support recursive operations: submodules must be taken care of
+explicitly by the user.
+
+*** Updating Bison
+
+If you pull a newer version of a branch, say via "git pull", you might
+import requests for updated submodules.  A simple "git diff" will reveal if
+the current version of the submodule (i.e., the actual contents of the
+gnulib directory) and the current request from the subscriber (i.e., the
+reference of the version of gnulib that the Bison repository requests)
+differ.  To upgrade the submodules (i.e., to check out the version that is
+actually requested by the subscriber, run "git submodule update".
+
+        $ git pull
+        $ git submodule update
+
+*** Updating a submodule
+To update a submodule, say gnulib, do as follows:
+
+Get the most recent version of the master branch from git.
+
+        $ cd gnulib
+        $ git fetch
+        $ git checkout -b master --track origin/master
+
+Make sure Bison can live with that version of gnulib.
+
+        $ cd ..
+        $ ./bootstrap
+        $ make distcheck
+
+Register your changes.
+
+        $ git checkin ...
+
+For a suggestion of what gnulib commit might be stable enough for a formal
+release, see the ChangeLog in the latest gnulib snapshot at:
+
+        http://erislabs.net/ianb/projects/gnulib/
+
+The Autoconf files we use are currently:
+
+        m4/m4.m4
+        lib/m4sugar/m4sugar.m4
+        lib/m4sugar/foreach.m4
+
+These files don't change very often in Autoconf, so it should be relatively
+straight-forward to examine the differences in order to decide whether to
+update.
+
+* Test suite
+
+** make check
+Use liberally.
+
+** TESTSUITEFLAGS
+
+To run just the testsuite (not the tests related to the examples), 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'
+
+Running only the tests of a certain category, as specified in the AT files
+with AT_KEYWORDS([[category]]). Categories include:
+  - c++, for c++ parsers
+  - deprec, for tests concerning deprecated constructs.
+  - glr, for glr parsers
+  - java, for java parsers
+  - report, for automaton dumps
+
+To run a specific set of tests, use -k (for "keyword"). For example:
+  $ make check-local TESTSUITEFLAGS='-k c++'
+
+Both can be combined.
+
+** Typical errors
+If the test suite shows failures such as the following one
+
+  .../bison/lib/getopt.h:196:8: error: redefinition of 'struct option'
+  /usr/include/getopt.h:54:8: error: previous definition of 'struct option'
+
+it probably means that some file was compiled without
+AT_DATA_SOURCE_PROLOGUE.  This error is due to the fact that our -I options
+pick up gnulib's replacement headers, such as getopt.h, and this will go
+wrong if config.h was not included first.
+
+See tests/local.at for details.
+
+** make maintainer-check-valgrind
+This target uses valgrind both to check bison, and the generated parsers.
+
+This is not mature on Mac OS X.  First, Valgrind does support the way bison
+calls m4, so Valgrind cannot be used to check bison on Mac OS X.
+
+Second, there are many errors that come from the platform itself, not from
+bison.  build-aux/darwin11.4.0.valgrind addresses some of them.
+
+Third, valgrind issues warnings such as:
+
+  --99312:0:syswrap- WARNING: Ignoring sigreturn( ..., UC_RESET_ALT_STACK );
+
+which cause the test to fail uselessly.  It is hard to ignore these errors
+with a major overhaul of the way instrumentation is performed in the test
+suite.  So currently, do not try to run valgrind on Mac OS X.
+
+** Release checks
+Try to run the test suite with more severe conditions before a
+release:
+
+- Configure the package with --enable-gcc-warnings, so that one checks that
+  1. Bison compiles cleanly, 2. the parsers it produces compile cleanly too.
+
+- Maybe build with -DGNULIB_POSIXCHECK, which suggests gnulib modules that
+  can fix portability issues.  See if you really want to pay attention to
+  its warnings; there's no need to obey blindly to it
+  (<http://lists.gnu.org/archive/html/bison-patches/2012-05/msg00057.html>).
+
+- Check with "make syntax-check" if there are issues diagnosed by gnulib.
+
+- run "make maintainer-check" which:
+  - runs "valgrind -q bison" to run Bison under Valgrind.
+  - runs the parsers under Valgrind.
+  - runs the test suite with G++ as C compiler...
+
+- run "make maintainer-check-push", which runs "make maintainer-check" while
+  activating the push implementation and its pull interface wrappers in many
+  test cases that were originally written to exercise only the pull
+  implementation.  This makes certain the push implementation can perform
+  every task the pull implementation can.
+
+- run "make maintainer-check-xml", which runs "make maintainer-check" while
+  checking Bison's XML automaton report for every working grammar passed to
+  Bison in the test suite.  The check just diffs the output of Bison's
+  included XSLT style sheets with the output of --report=all and --graph.
+
+- running "make maintainer-check-release" takes care of running
+  maintainer-check, maintainer-check-push and maintainer-check-xml.
+
+- Change tests/atlocal/CFLAGS to add your preferred options.
+
+- Test with a very recent version of GCC for both C and C++.  Testing with
+  older versions that are still in use is nice too.
+
+
+* Release Procedure
+This section needs to be updated to take into account features from gnulib.
+In particular, be sure to read README-release.
+
+** Update the submodules.  See above.
+
+** Update maintainer tools, such as Autoconf.  See above.
+
+** Try to get the *.pot files to the Translation Project at least one
+week before a stable release, to give them time to translate them.  Before
+generating the *.pot files, make sure that po/POTFILES.in and
+runtime-po/POTFILES.in list all files with translatable strings.  This
+helps: grep -l '\<_(' *.
+
+** Tests
+See above.
+
+** Update the foreign files
+Running "./bootstrap" in the top level should update them all for you.  This
+covers PO files too.  Sometimes a PO file contains problems that causes it
+to be rejected by recent Gettext releases; please report these to the
+Translation Project.
+
+** Update README
+Make sure the information in README is current.  Most notably, make sure it
+recommends a version of GNU M4 that is compatible with the latest Bison
+sources.
+
+** Check copyright years.
+We update years in copyright statements throughout Bison once at the start
+of every year by running "make update-copyright".  However, before a
+release, it's good to verify that it's actually been run.  Besides the
+copyright statement for each Bison file, check the copyright statements that
+the skeletons insert into generated parsers, and check all occurrences of
+PACKAGE_COPYRIGHT_YEAR in configure.ac.
+
+** Update NEWS, commit and tag.
+See do-release-commit-and-tag in README-release.  For a while, we used beta
+names such as "2.6_rc1".  Now that we use gnulib in the release procedure,
+we must use "2.5.90", which has the additional benefit of being properly
+sorted in "git tag -l".
+
+** make alpha, beta, or stable
+See README-release.
+
+** Upload
+There are two ways to upload the tarballs to the GNU servers: using gnupload
+(from gnulib), or by hand.  Obviously prefer the former.  But in either
+case, be sure to read the following paragraph.
+
+*** Setup
+You need "gnupg".
+
+Make sure your public key has been uploaded at least to keys.gnupg.net.  You
+can upload it with:
+
+  gpg --keyserver keys.gnupg.net --send-keys F125BDF3
+
+where F125BDF3 should be replaced with your key ID.
+
+*** Using gnupload
+You need "ncftp".
+
+At the end "make stable" (or alpha/beta) will display the procedure to run.
+Just copy and paste it in your shell.
+
+*** By hand
+
+The generic GNU upload procedure is at:
+
+  http://www.gnu.org/prep/maintain/maintain.html#Automated-FTP-Uploads
+
+Follow the instructions there to register your information so you're permitted
+to upload.
+
+Here's a brief reminder of how to roll the tarballs and upload them:
+
+*** make distcheck
+*** gpg -b bison-2.3b.tar.gz
+*** In a file named "bison-2.3b.tar.gz.directive", type:
+
+      version: 1.1
+      directory: bison
+      filename: bison-2.3b.tar.gz
+
+*** gpg --clearsign bison-2.3b.tar.gz.directive
+*** ftp ftp-upload.gnu.org # Log in as anonymous.
+*** cd /incoming/alpha # cd /incoming/ftp for full release.
+*** put bison-2.3b.tar.gz # This can take a while.
+*** put bison-2.3b.tar.gz.sig
+*** put bison-2.3b.tar.gz.directive.asc
+*** Repeat all these steps for bison-2.3b.tar.xz.
+
+** Update Bison manual on www.gnu.org.
+
+*** You need a non-anonymous checkout of the web pages directory.
+
+  $ cvs -d [email protected]:/web/bison checkout bison
+
+*** Get familiar with the instructions for web page maintainers.
+http://www.gnu.org/server/standards/readme_index.html
+http://www.gnu.org/server/standards/README.software.html
+especially the note about symlinks.
+
+*** Build the web pages.
+Assuming BISON_CHECKOUT refers to a checkout of the Bison dir, and
+BISON_WWW_CHECKOUT refers to the web directory created above, do:
+
+  $ cd $BISON_CHECKOUT/doc
+  $ make stamp-vti
+  $ ../build-aux/gendocs.sh -o "$BISON_WWW_CHECKOUT/manual" \
+    bison "Bison - GNU parser generator"
+  $ cd $BISON_WWW_CHECKOUT
+
+Verify that the result looks sane.
+
+*** Commit the modified and the new files.
+
+*** Remove old files.
+Find the files which have not been overwritten (because they belonged to
+sections that have been removed or renamed):
+
+   $ cd manual/html_node
+   $ ls -lt
+
+Remove these files and commit their removal to CVS.  For each of these
+files, add a line to the file .symlinks.  This will ensure that hyperlinks
+to the removed files will redirect to the entire manual; this is better than
+a 404 error.
+
+There is a problem with 'index.html' being written twice (once for POSIX
+function 'index', once for the table of contents); you can ignore this
+issue.
+
+** Announce
+The "make stable" (or alpha/beta) command just created a template,
+$HOME/announce-bison-X.Y.  Otherwise, to generate it, run:
+
+  make RELEASE_TYPE=alpha gpg_key_ID=F125BDF3 announcement
+
+where alpha can be replaced by beta or stable and F125BDF3 should be
+replaced with your key ID.
+
+Complete/fix the announcement file.  The generated list of recipients
+([email protected], [email protected], [email protected],
+[email protected], and [email protected]) is
+appropriate for a stable release or a "serious beta".  For any other
+release, drop at least [email protected].  For an example of how to fill out
+the rest of the template, search the mailing list archives for the most
+recent release announcement.
+
+For a stable release, send the same announcement on the comp.compilers
+newsgroup by sending email to [email protected].  Do not make any Cc as the
+moderator will throw away anything cross-posted or Cc'ed.  It really needs
+to be a separate message.
+
+** Prepare NEWS
+So that developers don't accidentally add new items to the old NEWS entry,
+create a new empty entry in line 3 (without the two leading spaces):
+
+  * Noteworthy changes in release ?.? (????-??-??) [?]
+
+Push these changes.
+
+-----
+
+Copyright (C) 2002-2005, 2007-2015, 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/>.
+
+ LocalWords:  Automake Autoconf Gettext Gzip Rsync Valgrind gnulib submodules
+ LocalWords:  submodule init cd distcheck checkin ChangeLog valgrind sigreturn
+ LocalWords:  UC gcc DGNULIB POSIXCHECK xml XSLT glr lalr README po runtime rc
+ LocalWords:  gnupload gnupg gpg keyserver BDF ncftp filename clearsign cvs dir
+ LocalWords:  symlinks vti html lt POSIX Cc'ed
+
+Local Variables:
+mode: outline
+fill-column: 76
+End:

README-hacking.md

@@ -1,610 +0,0 @@
-This file attempts to describe the rules to use when hacking Bison.
-Don't put this file into the distribution.
-
-Everything related to the development of Bison is on Savannah:
-http://savannah.gnu.org/projects/bison/.
-
-
-Working from the Repository
-===========================
-
-These notes intend to help people working on the checked-out sources.  These
-requirements do not apply when building from a distribution tarball.
-
-## Requirements
-
-We've opted to keep only the highest-level sources in the repository.  This
-eases our maintenance burden, (fewer merges etc.), but imposes more
-requirements on anyone wishing to build from the just-checked-out sources.
-For example, you have to use the latest stable versions of the maintainer
-tools we depend upon, including:
-
-- Autoconf <http://www.gnu.org/software/autoconf/>
-- Automake <http://www.gnu.org/software/automake/>
-- Flex <http://www.gnu.org/software/flex/>
-- Gettext <http://www.gnu.org/software/gettext/>
-- Gperf <http://www.gnu.org/software/gperf/>
-- Graphviz <http://www.graphviz.org>
-- Gzip <http://www.gnu.org/software/gzip/>
-- Help2man <http://www.gnu.org/software/help2man/>
-- Perl <http://www.cpan.org/>
-- Rsync <http://samba.anu.edu.au/rsync/>
-- Tar <http://www.gnu.org/software/tar/>
-- Texinfo <http://www.gnu.org/software/texinfo/>
-
-Valgrind <http://valgrind.org/> is also highly recommended, if it supports
-your architecture.
-
-If you're using a GNU/Linux distribution, the easiest way to install the
-above packages depends on your system.  The following shell command should
-work for Debian-based systems such as Ubuntu:
-
-    sudo apt-get install \
-      autoconf automake autopoint flex gperf graphviz help2man texinfo valgrind
-
-Bison is written using Bison grammars, so there are bootstrapping issues.
-The bootstrap script attempts to discover when the C code generated from the
-grammars is out of date, and to bootstrap with an out-of-date version of the
-C code, but the process is not foolproof.  Also, you may run into similar
-problems yourself if you modify Bison.
-
-Only building the initial full source tree will be a bit painful.  Later,
-after synchronizing from the repository a plain 'make' should be sufficient.
-Note, however, that when gnulib is updated, running './bootstrap' again
-might be needed.
-
-## First checkout
-
-Obviously, if you are reading these notes, you did manage to check out this
-package from the repository.  For the record, you will find all the relevant
-information on http://savannah.gnu.org/git/?group=bison.
-
-Bison uses Git submodules: subscriptions to other Git repositories.  In
-particular it uses gnulib, the GNU portability library.  To ask Git to
-perform the first checkout of the submodules, run
-
-    $ git submodule update --init
-
-The next step is to get other files needed to build, which are extracted
-from other source packages:
-
-    $ ./bootstrap
-
-Bootstrapping updates the submodules to the versions registered in the
-top-level directory.  To change gnulib, first check out the version you want
-in `gnulib`, then commit this change in Bison's repository, and finally run
-bootstrap.
-
-If it fails with missing symbols (e.g., `error: possibly undefined macro:
-AC_PROG_GNU_M4`), you are likely to have forgotten the submodule
-initialization part.  To recover from it, run `git reset --hard HEAD`, and
-restart with the submodule initialization.  Otherwise, there you are!  Just
-
-    $ ./configure
-    $ make
-    $ make check
-
-At this point, there should be no difference between your local copy, and
-the master copy:
-
-    $ git diff
-
-should output no difference.
-
-Enjoy!
-
-## Updating
-
-If you have git at version 1.8.2 or later, the command
-
-    $ git submodule update --recursive --remote
-
-will be useful for updating to the latest version of all submodules.
-
-Under earlier versions, use of submodules make things somewhat different
-because git does not yet support recursive operations: submodules must be
-taken care of explicitly.
-
-### Updating Bison
-
-If you pull a newer version of a branch, say via `git pull`, you might
-import requests for updated submodules.  A simple `git diff` will reveal if
-the current version of the submodule (i.e., the actual contents of the
-gnulib directory) and the current request from the subscriber (i.e., the
-reference of the version of gnulib that the Bison repository requests)
-differ.  To upgrade the submodules (i.e., to check out the version that is
-actually requested by the subscriber, run `git submodule update`.
-
-    $ git pull
-    $ git submodule update
-
-### Updating a submodule
-To update a submodule, say gnulib, do as follows:
-
-Get the most recent version of the master branch from git.
-
-    $ cd gnulib
-    $ git fetch
-    $ git checkout -b master --track origin/master
-
-Make sure Bison can live with that version of gnulib.
-
-    $ cd ..
-    $ ./bootstrap
-    $ make distcheck
-
-Register your changes.
-
-    $ git commit ...
-
-For a suggestion of what gnulib commit might be stable enough for a formal
-release, see the ChangeLog in the latest gnulib snapshot at
-http://erislabs.net/ianb/projects/gnulib/.
-
-The Autoconf files we use are currently:
-- m4/m4.m4
-- lib/m4sugar/m4sugar.m4
-- lib/m4sugar/foreach.m4
-
-These files don't change very often in Autoconf, so it should be relatively
-straight-forward to examine the differences in order to decide whether to
-update.
-
-## Troubleshooting
-
-Bison is self-hosted: its parser is generated by Bison.  We don't force
-ourselves to use the previous release of Bison, we use the current git
-master for several reasons:
-- dogfooding: let Bison be its first user
-- monitoring: seeing the diff on the generated parsers with git is very
-  helpful, as it allows to see easily the impact of the changes on a real
-  case parser.
-
-If you are unlucky the generated files, src/parse-gram.[ch], may be older
-than their source, src/parse-gram.y.  And your current version of Bison
-might not be able to grok it.  In that case, first refresh the generated
-files:
-
-    $ touch src/parse-gram.[ch]
-
-Then proceed.
-
-In case you wrecked your current copy of the parser, get back the previous
-version, compile bison, then force it to recreate the files:
-
-    $ git checkout HEAD^ src/parse-gram.[ch]
-    $ make -C _build
-    $ touch src/parse-gram.y
-    $ make -C _build
-
-
-Administrivia
-=============
-
-## If you incorporate a change from somebody on the net:
-First, if it is a large change, you must make sure they have signed the
-appropriate paperwork.  Second, be sure to add their name and email address
-to THANKS.
-
-## If a change fixes a test, mention the test in the commit message.
-
-## Bug reports
-If somebody reports a new bug, mention his name in the commit message and in
-the test case you write.  Put him into THANKS.
-
-The correct response to most actual bugs is to write a new test case which
-demonstrates the bug.  Then fix the bug, re-run the test suite, and check
-everything in.
-
-
-
-Hacking
-=======
-
-## Visible Changes
-Which include serious bug fixes, must be mentioned in NEWS.
-
-## Translations
-Only user visible strings are to be translated: error messages, bits of the
-.output file etc.  This excludes impossible error messages (comparable to
-assert/abort), and all the --trace output which is meant for the maintainers
-only.
-
-## Vocabulary
-- "lookahead", not "look-ahead".
-- "midrule", not "mid-rule".
-- "nonterminal", not "variable" or "non-terminal" or "non terminal".
-  Abbreviated as "nterm".
-- "shift/reduce" and "reduce/reduce", not "shift-reduce" or "shift reduce",
-  etc.
-
-## Syntax Highlighting
-It's quite nice to be in C++ mode when editing lalr1.cc for instance.
-However tools such as Emacs will be fooled by the fact that braces and
-parens do not nest, as in `[[}]]`.  As a consequence you might be misguided
-by its visual pairing to parens.  The m4-mode is safer.  Unfortunately the
-m4-mode is also fooled by `#` which is sees as a comment, stops pairing with
-parens/brackets that are inside...
-
-## Implementation Notes
-There are several places with interesting details about the implementation:
-- [Understanding C parsers generated by GNU
-Bison](https://www.cs.uic.edu/~spopuri/cparser.html) by Satya Kiran Popuri,
-is a wonderful piece of work that explains the implementation of Bison,
-- [src/gram.h](src/gram.h) documents the way the grammar is represented
-- [src/tables.h](src/tables.h) documents the generated tables
-- [data/README.md](data/README.md) contains details about the m4 implementation
-
-## Coding Style
-Do not add horizontal tab characters to any file in Bison's repository
-except where required.  For example, do not use tabs to format C code.
-However, make files, ChangeLog, and some regular expressions require tabs.
-Also, test cases might need to contain tabs to check that Bison properly
-processes tabs in its input.
-
-Prefer `res` as the name of the local variable that will be "return"ed by
-the function.
-
-In writing arithmetic comparisons, use "<" and "<=" rather than ">" and ">="
-(http://www.gelato.unsw.edu.au/archives/git/0505/4507.html).
-
-### Bison
-Follow the GNU Coding Standards.
-
-Don't reinvent the wheel: we use gnulib, which features many components.
-Actually, Bison has legacy code that we should replace with gnulib modules
-(e.g., many ad hoc implementations of lists).
-
-#### Includes
-The `#include` directives follow an order:
-- first section for *.c files is `<config.h>`.  Don't include it in header
-  files
-- then, for *.c files, the corresponding *.h file
-- then possibly the `"system.h"` header
-- then the system headers.
-  Consider headers from `lib/` like system headers (i.e., `#include
-  <verify.h>`, not `#include "verify.h"`).
-- then headers from src/ with double quotes (`#include "getargs.h"`).
-
-Keep headers sorted alphabetically in each section.
-
-See also the [Header
-files](https://www.gnu.org/software/gnulib/manual/html_node/Header-files.html)
-and the [Implementation
-files](https://www.gnu.org/software/gnulib/manual/html_node/Implementation-files.html#Implementation-files)
-nodes of the gnulib documentation.
-
-Some source files are in the build tree (e.g., `src/scan-gram.c` made from
-`src/scan-gram.l`).  For them to find the headers from `src/`, we actually
-use `#include "src/getargs.h"` instead of `#include "getargs.h"`---that
-saves us from additional `-I` flags.
-
-### Skeletons
-We try to use the "typical" coding style for each language.
-
-#### CPP
-We indent the CPP directives this way:
-
-```
-#if FOO
-# if BAR
-#  define BAZ
-# endif
-#endif
-```
-
-Don't indent with leading spaces in the skeletons (it's OK in the grammar
-files though, e.g., in `%code {...}` blocks).
-
-On occasions, use `cppi -c` to see where we stand.  We don't aim at full
-correctness: depending `-d`, some bits can be in the *.c file, or the *.h
-file within the double-inclusion cpp-guards.  In that case, favor the case
-of the *.h file, but don't waste time on this.
-
-Don't hesitate to leave a comment on the `#endif` (e.g., `#endif /* FOO
-*/`), especially for long blocks.
-
-There is no consistency on `! defined` vs. `!defined`.  The day gnulib
-decides, we'll follow them.
-
-#### C/C++
-Follow the GNU Coding Standards.
-
-The `glr.c` skeleton was implemented with `camlCase`.  We are migrating it
-to `snake_case`.  Because we are gradually standardizing the code, it is
-currently inconsistent.
-
-Use `YYFOO` and `yyfoo` for entities that are exposed to the user.  They are
-part of our contract with the users wrt backward compatibility.
-
-Use `YY_FOO` and `yy_foo` for private matters.  Users should not use them,
-we are free to change them without fear of backward compatibility issues.
-
-Use `*_t` for types, especially for `yy*_t` in which case we shouldn't worry
-about the C standard introducing such a name.
-
-#### C++
-Follow the [C++ Core
-Guidelines](http://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines).
-The [Google ones](https://google.github.io/styleguide/cppguide.html) may be
-interesting too.
-
-Our enumerators, such as the kinds (symbol and token kinds), should be lower
-case, but it was too late to follow that track for token kinds, and symbol
-kind enumerators are made to be consistent with them.
-
-Use `*_type` for type aliases.  Use `foo_get()` and `foo_set(v)` for
-accessors, or simply `foo()` and `foo(v)`.
-
-Use the `yy` prefix for private stuff, but there's no need for it in the
-public API.  The `yy` prefix is already taken care of via the namespace.
-
-#### Java
-We follow the [Java Code
-Conventions](https://www.oracle.com/technetwork/java/codeconventions-150003.pdf)
-and [Google Java Style
-Guide](https://google.github.io/styleguide/javaguide.html).  Unfortunately
-at some point some GNU Coding Style was installed in Java, but it's an
-error.  So we should for instance stop putting spaces in function calls.
-Because we are standardizing the code, it is currently inconsistent.
-
-Use a 2-space indentation (Google) rather than 4 (Oracle).
-
-Don't use the "yy" prefix for public members: "getExpectedTokens", not
-"yyexpectedTokens" or "yygetExpectedTokens".
-
-## Commit Messages
-Imitate the style we use.  Use `git log` to get sources of inspiration.
-
-If the changes have a small impact on Bison's generated parser, embed these
-changes in the commit itself.  If the impact is large, first push all the
-changes except those about src/parse-gram.[ch], and then another commit
-named "regen" which is only about them.
-
-## Debugging
-Bison supports tracing of its various steps, via the `--trace` option.
-Since it is not meant for the end user, it is not displayed by `bison
---help`, nor is it documented in the manual.  Instead, run `bison
---trace=help`.
-
-## Documentation
-Use `@option` for options and options with their argument if they have no
-space (e.g., `@option{-Dfoo=bar}`).  However, use `@samp` elsewhere (e.g.,
-`@samp{-I foo}`).
-
-
-Test Suite
-==========
-
-## make check
-Consume without moderation.  It is composed of two kinds of tests: the
-examples, and the main test suite.
-
-### The Examples
-In examples/, there is a number of ready-to-use examples (see
-[examples/README.md](examples/README.md)).  These examples have small test
-suites run by `make check`.  The test results are in local `*.log` files
-(e.g., `$build/examples/c/calc/calc.log`).
-
-### The Main Test Suite
-The main test suite, in tests/, is written on top of GNU Autotest, which is
-part of Autoconf.  Run `info autoconf 'Using Autotest'` to read the
-documentation, not only about how to write tests, but also where are the
-logs, how to read them etc.
-
-The main test suite generates a log for each test (e.g.,
-`$build/tests/testsuite.dir/004/testsuite.log` for test #4), and a main log
-file in `$build/tests/testsuite.log`.  The latter is meant for end users: it
-contains lots of details that should help diagnosing issues, including build
-issues.  The per-test logs are more convenient when working locally.
-
-#### TESTSUITEFLAGS
-To run just the main test suite, run `make check-local`.
-
-The default is for make check-local to run all tests sequentially.  This can
-be very time consuming when checking repeatedly or on slower setups.  This
-can be sped up in two ways:
-
-Using -j, in a make-like fashion, for example:
-
-    $ make check-local TESTSUITEFLAGS='-j8'
-
-Actually, when using GNU Make, TESTSUITEFLAGS defaults to the -jN passed to
-it, so you may simply run
-
-    $ make check-local -j8
-
-Running only the tests of a certain category, as specified in the AT files
-with AT_KEYWORDS([[category]]). Categories include:
-- c++, for c++ parsers
-- deprec, for tests concerning deprecated constructs.
-- glr, for glr parsers
-- java, for java parsers
-- report, for automaton dumps
-
-To get a list of all the tests (and their keywords for -k), run
-
-    $ ./tests/testsuite -l
-
-To run a specific set of tests, use -k (for "keyword"). For example:
-
-    $ make check-local TESTSUITEFLAGS='-k c++'
-
-Both can be combined.
-
-    $ make check-local TESTSUITEFLAGS='-j8 -k c++'
-
-To rerun the tests that failed:
-
-    $ make recheck -j5
-
-#### Updating the Expectations
-Sometimes some changes have a large impact on the test suite (e.g., when we
-added the `[-Wother]` part to all the warnings).  Part of the update can be
-done with a crude tool: `build-aux/update-test`.
-
-Once you ran the test suite, and therefore have many `testsuite.log` files,
-run `make update-tests`.  Or, by hand, from the *source* tree:
-
-    $ ./build-aux/update-test $build/tests/testsuite.dir/*/testsuite.log
-
-where `$build` would be your build tree.  This will hopefully update most
-tests.  Re-run the test suite.  It might be interesting to run `update-test`
-again, since some early failures may stop latter tests from being run.  Yet
-at some point, you'll have to fix remaining issues by hand...
-
-
-## Running Java parsers
-Use the `javaexec.sh` script.  For instance to run the parser of test case
-504:
-
-    $ sh ./_build/javaexec.sh -cp ./_build/tests/testsuite.dir/504 Calc
-
-## Using Sanitizers
-Address sanitizer (ASAN) and undefined-behavior sanitizer (UBSAN) are very
-useful.  Here's one way to set ASAN up with GCC 10 on Mac Ports
-
-1. Configure with
-
-    $ ./configure -C --enable-gcc-warnings \
-        CPPFLAGS='-isystem /opt/local/include' \
-        CC='gcc-mp-10 -fsanitize=address' \
-        CFLAGS='-ggdb' \
-        CXX='g++-mp-10.0 -fsanitize=address' \
-        CXXFLAGS='-ggdb' \
-        LDFLAGS='-L/opt/local/lib'
-
-2. Compile
-
-3. Generate debug symbols:
-
-    $ dsymutil src/bison
-
-4. Run the tests with leak detection enabled
-   (`ASAN_OPTIONS=detect_leaks=1`).  E.g. for counterexamples:
-
-    $ make check-local TESTSUITEFLAGS='-j5 -k cex' ASAN_OPTIONS=detect_leaks=1
-
-## make maintainer-check-valgrind
-This target uses valgrind both to check bison, and the generated parsers.
-
-This is not mature on Mac OS X.  First, Valgrind does support the way bison
-calls m4, so Valgrind cannot be used to check bison on Mac OS X.
-
-Second, there are many errors that come from the platform itself, not from
-bison.  build-aux/darwin11.4.0.valgrind addresses some of them.
-
-Third, valgrind issues warnings such as:
-
-    --99312:0:syswrap- WARNING: Ignoring sigreturn( ..., UC_RESET_ALT_STACK );
-
-which cause the test to fail uselessly.  It is hard to ignore these errors
-with a major overhaul of the way instrumentation is performed in the test
-suite.  So currently, do not try to run valgrind on Mac OS X.
-
-## Release checks
-Try to run the test suite with more severe conditions before a
-release:
-
-- Configure the package with --enable-gcc-warnings, so that one checks that
-  1. Bison compiles cleanly, 2. the parsers it produces compile cleanly too.
-
-- Maybe build with -DGNULIB_POSIXCHECK, which suggests gnulib modules that
-  can fix portability issues.  See if you really want to pay attention to
-  its warnings; there's no need to obey blindly to it
-  (<http://lists.gnu.org/archive/html/bison-patches/2012-05/msg00057.html>).
-
-- Check with `make syntax-check` if there are issues diagnosed by gnulib.
-
-- run `make maintainer-check` which:
-  - runs `valgrind -q bison` to run Bison under Valgrind.
-  - runs the parsers under Valgrind.
-  - runs the test suite with G++ as C compiler...
-
-- run `make maintainer-check-push`, which runs `make maintainer-check` while
-  activating the push implementation and its pull interface wrappers in many
-  test cases that were originally written to exercise only the pull
-  implementation.  This makes certain the push implementation can perform
-  every task the pull implementation can.
-
-- run `make maintainer-check-xml`, which runs `make maintainer-check` while
-  checking Bison's XML automaton report for every working grammar passed to
-  Bison in the test suite.  The check just diffs the output of Bison's
-  included XSLT style sheets with the output of --report=all and --graph.
-
-- running `make maintainer-check-release` takes care of running
-  maintainer-check, maintainer-check-push and maintainer-check-xml.
-
-- Change tests/atlocal/CFLAGS to add your preferred options.
-
-- Test with a very recent version of GCC for both C and C++.  Testing with
-  older versions that are still in use is nice too.
-
-## gnulib
-To run tests on gnulib components (e.g., on bitset):
-
-    cd gnulib
-    ./gnulib-tool --test bitset-tests
-
-possibly within a specified environment:
-
-    CC='gcc-mp-8 -fsanitize=undefined' ./gnulib-tool --test bitset-tests
-
-To be able to run the tests several times, and to use symlinks instead of
-copies so that one can update the origin gnulib directory and immediately
-re-run the tests, run:
-
-    ./gnulib-tool --symlink --create-test --dir=/tmp/gnutest bitset-tests
-    cd /tmp/gnutest
-    ./configure -C CC='gcc-mp-8 -fsanitize=undefined' CFLAGS='-ggdb'
-    make check
-
-
-
-Release Procedure
-=================
-
-See the [README-release file](README-release), created when the package is
-bootstrapped.
-
-<!--
-
-Copyright (C) 2002-2005, 2007-2015, 2018-2020 Free Software Foundation,
-Inc.
-
-This file is part of GNU Bison.
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-Local Variables:
-mode: markdown
-fill-column: 76
-ispell-dictionary: "american"
-End:
-
-LocalWords:  Automake Autoconf Gettext Gzip Rsync Valgrind gnulib submodules
-LocalWords:  submodule init cd distcheck ChangeLog valgrind sigreturn sudo
-LocalWords:  UC gcc DGNULIB POSIXCHECK xml XSLT glr lalr README po runtime rc
-LocalWords:  gnupload gnupg gpg keyserver BDF ncftp filename clearsign cvs dir
-LocalWords:  symlinks vti html lt POSIX Cc'ed Graphviz Texinfo autoconf jN
-LocalWords:  automake autopoint graphviz texinfo PROG Wother parsers YYFOO
-LocalWords:  TESTSUITEFLAGS deprec struct gnulib's getopt config ggdb yyfoo
-LocalWords:  bitset fsanitize symlink CFLAGS MERCHANTABILITY ispell wrt YY
-LocalWords:  american Administrivia camlCase yy accessors namespace src hoc
-LocalWords:  getExpectedTokens yyexpectedTokens yygetExpectedTokens parens
-LocalWords:  regen dogfooding Autotest testsuite getargs CPP BAZ endif cppi
-LocalWords:  cpp javaexec cp Calc ASAN UBSAN CPPFLAGS isystem CXX cex Gperf
-LocalWords:  CXXFLAGS LDFLAGS dsymutil gperf
-
--->

README.md

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

REFERENCES

@@ -0,0 +1,33 @@
+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

@@ -4,15 +4,12 @@ it is today without the invaluable help of these people:
 Aaro Koskinen             [email protected]
 Аскар Сафин               [email protected]
 Adam Sampson              [email protected]
-Adrian Vogelsgesang       [email protected]
-Ahcheong Lee              [email protected]
 Airy Andre                [email protected]
-Akim Demaille             akim@gnu.org
+Akim Demaille             akim@lrde.epita.fr
 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]
@@ -20,9 +17,7 @@ Anthony Heading           [email protected]
 Antonio Silva Correia     [email protected]
 Arnold Robbins            [email protected]
 Art Haas                  [email protected]
-Arthur Schwarz            [email protected]
 Askar Safin               [email protected]
-Balázs Scheidler          [email protected]
 Baron Schwartz            [email protected]
 Ben Pfaff                 [email protected]
 Benoit Perrot             [email protected]
@@ -37,7 +32,6 @@ 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]
@@ -45,9 +39,7 @@ Csaba Raduly              [email protected]
 Dagobert Michelsen        [email protected]
 Daniel Frużyński          [email protected]
 Daniel Galloway           [email protected]
-Daniela Becker            [email protected]
 Daniel Hagerty            [email protected]
-David Barto               [email protected]
 David J. MacKenzie        [email protected]
 David Kastrup             [email protected]
 David Michael             [email protected]
@@ -59,15 +51,10 @@ Derek M. Jones            [email protected]
 Di-an Jan                 [email protected]
 Dick Streefland           [email protected]
 Didier Godefroy           [email protected]
-Don Macpherson            [email protected]
-Dwight Guth               [email protected]
 Efi Fogel                 [email protected]
 Enrico Scholz             [email protected]
 Eric Blake                [email protected]
-Eric S. Raymond           [email protected]
 Étienne Renault           [email protected]
-Evan Lavelle              [email protected]
-Evan Nemerson             [email protected]
 Evgeny Stambulchik        [email protected]
 Fabrice Bauzac            [email protected]
 Ferdinand Thiessen        [email protected]
@@ -76,7 +63,6 @@ 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]
@@ -85,10 +71,8 @@ Guido Trentalancia        [email protected]
 H. Merijn Brand           [email protected]
 Hans Åberg                [email protected]
 Horst Von Brand           [email protected]
-Jacob L. Mandelson        [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]
@@ -100,21 +84,16 @@ 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 Blais              [email protected]
 Martin Jacobs             [email protected]
 Martin Mokrejs            [email protected]
 Martin Nylin              [email protected]
@@ -134,21 +113,17 @@ 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]
@@ -160,13 +135,11 @@ Petr Machata              [email protected]
 Pho                       [email protected]
 Piotr Gackiewicz          [email protected]
 Piotr Marcińczyk          [email protected]
-Pramod Kumbhar            [email protected]
 Quentin Hocquet           [email protected]
 Quoc Peyrot               [email protected]
 R Blake                   [email protected]
 Raja R Harinath           [email protected]
 Ralf Wildenhues           [email protected]
-Ryan                      [email protected]
 Rich Wilson               [email protected]
 Richard Stallman          [email protected]
 Rici Lake                 [email protected]
@@ -189,40 +162,28 @@ 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]
-Yuriy Solodkyy            [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.
@@ -234,7 +195,7 @@ End:
 
 -----
 
-Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2000-2015, 2018 Free Software Foundation, Inc.
 
 This file is part of Bison, the GNU Parser Generator.
 

TODO

@@ -1,289 +1,19 @@
-* Bison 3.7
-** Cex
-*** Improve gnulib
-Don't do this (counterexample.c):
-
-// This is the fastest way to get the tail node from the gl_list API.
-gl_list_node_t
-list_get_end (gl_list_t list)
-{
-  gl_list_node_t sentinel = gl_list_add_last (list, NULL);
-  gl_list_node_t res = gl_list_previous_node (list, sentinel);
-  gl_list_remove_node (list, sentinel);
-  return res;
-}
-
-*** Ambiguous rewriting
-If the user is stupid enough to have equal rules, then the derivations are
-harder to read:
-
-    Reduce/reduce conflict on tokens $end, "+", "⊕":
-        2 exp: exp "+" exp .
-        3 exp: exp "+" exp .
-      Example                  exp "+" exp •
-      First derivation         exp ::=[ exp "+" exp • ]
-      Example                  exp "+" exp •
-      Second derivation        exp ::=[ exp "+" exp • ]
-
-Do we care about this?  In color, we use twice the same color here, but we
-could try to use the same color for the same rule.
-
-*** XML reports
-Show the counterexamples.  This is going to be really hard and/or painful.
-Unless we play it dumb (little structure).
-
-** Bistromathic
-- How about not evaluating incomplete lines when the text is not finished
-  (as shells do).
-
-** Questions
-*** Java
-- Should i18n be part of the Lexer?  Currently it's a static method of
-  Lexer.
-
-- is there a migration path that would allow to use TokenKinds in
-  yylex?
-
-- define the tokens as an enum too.
-
-- promote YYEOF rather than EOF.
-
-*** D
-- is there a way to attach yysymbol_name to the enum itself?  As we did
-  in Java.
-
-- It would be better to have TokenKind as return value.  Can we use
-  reflection to support both output types?
-
-** YYerror
-https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=blob;f=gettext-runtime/intl/plural.y;h=a712255af4f2f739c93336d4ff6556d932a426a5;hb=HEAD
-
-should be updated to not use YYERRCODE.  Returning an undef token is good
-enough.
-
-** Java
-*** calc.at
-Stop hard-coding "Calc".  Adjust local.at (look for FIXME).
-
-** A dev warning for b4_
-Maybe we should check for m4_ and b4_ leaking out of the m4 processing, as
-Autoconf does.  It would have caught overquotation issues.
-
-** doc
-I feel it's ugly to use the GNU style to declare functions in the doc.  It
-generates tons of white space in the page, and may contribute to bad page
-breaks.
-
-** consistency
-token vs terminal.
-
-** api.token.raw
-The YYUNDEFTOK could be assigned a semantic value so that yyerror could be
-used to report invalid lexemes.
-
-** push parsers
-Consider deprecating impure push parsers.  They add a lot of complexity, for
-a bad feature.  On the other hand, that would make it much harder to sit
-push parsers on top of pull parser.  Which is currently not relevant, since
-push parsers are measurably slower.
-
-** %define parse.error formatted
-How about pushing bistromathics' yyreport_syntax_error as another standard
-way to generate the error message, and leave to the user the task of
-providing the message formats?  Currently in bistro, it reads:
-
-    const char *
-    error_format_string (int argc)
-    {
-      switch (argc)
-        {
-        default: /* Avoid compiler warnings. */
-        case 0: return _("%@: syntax error");
-        case 1: return _("%@: syntax error: unexpected %u");
-          // TRANSLATORS: '%@' is a location in a file, '%u' is an
-          // "unexpected token", and '%0e', '%1e'... are expected tokens
-          // at this point.
-          //
-          // For instance on the expression "1 + * 2", you'd get
-          //
-          // 1.5: syntax error: expected - or ( or number or function or variable before *
-        case 2: return _("%@: syntax error: expected %0e before %u");
-        case 3: return _("%@: syntax error: expected %0e or %1e before %u");
-        case 4: return _("%@: syntax error: expected %0e or %1e or %2e before %u");
-        case 5: return _("%@: syntax error: expected %0e or %1e or %2e or %3e before %u");
-        case 6: return _("%@: syntax error: expected %0e or %1e or %2e or %3e or %4e before %u");
-        case 7: return _("%@: syntax error: expected %0e or %1e or %2e or %3e or %4e or %5e before %u");
-        case 8: return _("%@: syntax error: expected %0e or %1e or %2e or %3e or %4e or %5e or %6e before %u");
-        }
-    }
-
-The message would have to be generated in a string, and pushed to yyerror.
-Which will be a pain in the neck in yacc.c.
-
-If we want to do that, we should think very carefully about the syntax of
-the format string.
-
-** yyclearin does not invoke the lookahead token's %destructor
-https://lists.gnu.org/r/bug-bison/2018-02/msg00000.html
-Rici:
-
-> Modifying yyclearin so that it calls yydestruct seems like the simplest
-> solution to this issue, but it is conceivable that such a change would
-> break programs which already perform some kind of workaround in order to
-> destruct the lookahead symbol. So it might be necessary to use some kind of
-> compatibility %define, or to create a new replacement macro with a
-> different name such as yydiscardin.
->
-> At a minimum, the fact that yyclearin does not invoke the %destructor
-> should be highlighted in the documentation, since it is not at all obvious.
-
-** Issues in i18n
-
-Les catégories d'avertissements incluent :
-  conflicts-sr      conflits S/R (activé par défaut)
-  conflicts-rr      conflits R/R (activé par défaut)
-  dangling-alias    l'alias chaîne n'est pas attaché à un symbole
-  deprecated        construction obsolète
-  empty-rule        règle vide sans %empty
-  midrule-values    valeurs de règle intermédiaire non définies ou inutilisées
-  precedence        priorité et associativité inutiles
-  yacc              incompatibilités avec POSIX Yacc
-  other             tous les autres avertissements (activé par défaut)
-  all               tous les avertissements sauf « dangling-alias » et « yacc »
-  no-CATEGORY       désactiver les avertissements dans CATEGORIE
-  none              désactiver tous les avertissements
-  error[=CATEGORY]  traiter les avertissements comme des erreurs
-
-Line -1 and -3 should mention CATEGORIE, not CATEGORY.
-
-* Bison 3.8
-** Rewrite glr.cc
-Get rid of scaffolding in glr.c.
-
-** Unit rules / Injection rules (Akim Demaille)
-Maybe we could expand unit rules (or "injections", see
-https://homepages.cwi.nl/~daybuild/daily-books/syntax/2-sdf/sdf.html), i.e.,
-transform
-
-        exp: arith | bool;
-        arith: exp '+' exp;
-        bool: exp '&' exp;
-
-into
-
-        exp: exp '+' exp | exp '&' exp;
-
-when there are no actions.  This can significantly speed up some grammars.
-I can't find the papers.  In particular the book 'LR parsing: Theory and
-Practice' is impossible to find, but according to 'Parsing Techniques: a
-Practical Guide', it includes information about this issue.  Does anybody
-have it?
-
-** clean up (Akim Demaille)
-Do not work on these items now, as I (Akim) have branches with a lot of
-changes in this area (hitting several files), and no desire to have to fix
-conflicts.  Addressing these items will happen after my branches have been
-merged.
-
-*** lalr.c
-Introduce a goto struct, and use it in place of from_state/to_state.
-Rename states1 as path, length as pathlen.
-Introduce inline functions for things such as nullable[*rp - ntokens]
-where we need to map from symbol number to nterm number.
-
-There are probably a significant part of the relations management that
-should be migrated on top of a bitsetv.
-
-*** closure
-It should probably take a "state*" instead of two arguments.
-
-*** traces
-The "automaton" and "set" categories are not so useful.  We should probably
-introduce lr(0) and lalr, just the way we have ielr categories.  The
-"closure" function is too verbose, it should probably have its own category.
-
-"set" can still be used for summariring the important sets.  That would make
-tests easy to maintain.
-
-*** complain.*
-Rename these guys as "diagnostics.*" (or "diagnose.*"), since that's the
-name they have in gcc, clang, etc.  Likewise for the complain_* series of
-functions.
-
-*** ritem
-states/nstates, rules/nrules, ..., ritem/nritems
-Fix the latter.
-
-* Better error messages
-The users are not provided with enough tools to forge their error messages.
-See for instance "Is there an option to change the message produced by
-YYERROR_VERBOSE?" by Simon Sobisch, on bison-help.
-
-See also
-https://www.cs.tufts.edu/~nr/cs257/archive/clinton-jefferey/lr-error-messages.pdf
-https://research.swtch.com/yyerror
-http://gallium.inria.fr/~fpottier/publis/fpottier-reachability-cc2016.pdf
-
-* Modernization
-Fix data/skeletons/yacc.c so that it defines YYPTRDIFF_T properly for modern
-and older C++ compilers.  Currently the code defaults to defining it to
-'long' for non-GCC compilers, but it should use the proper C++ magic to
-define it to the same type as the C ptrdiff_t type.
-
-* Completion
-Several features are not available in all the backends.
-
-- lac: D, Java (easy)
-- push parsers: glr.c, glr.cc, lalr1.cc (not very difficult)
-- token constructors: Java, C, D (a bit difficult)
-- glr: D, Java (super difficult)
-
-* 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.
+** yacc.c
+Now that ylwrap is fixed, we should include foo.tab.h from foo.tab.c rather
+than duplicating it.
 
-** Better design for diagnostics
-The current implementation of diagnostics is ad hoc, it grew organically.
-It works as a series of calls to several functions, with dependency of the
-latter calls on the former.  For instance:
+** C++
+Move to int everywhere instead of unsigned?  stack_size, etc.  The parser
+itself uses int (for yylen for instance), yet stack is based on size_t.
 
-      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);
+Maybe locations should also move to ints.
 
-We should rewrite this in a more FP way:
+** C
+Introduce state_type rather than spreading yytype_int16 everywhere?
 
-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
+** glr.c
+yyspaceLeft should probably be a pointer diff.
 
 ** Graphviz display code thoughts
 The code for the --graph option is over two files: print_graph, and
@@ -304,6 +34,9 @@ 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
@@ -337,6 +70,11 @@ 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.
 
@@ -360,15 +98,56 @@ 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.
+** YYERRCODE
+Defined to 256, but not used, not documented.  Probably the token
+number for the error token, which POSIX wants to be 256, but which
+Bison might renumber if the user used number 256.  Keep fix and doc?
+Throw away?
 
-Valentin Tolmer is working on this.
+Also, why don't we output the token name of the error token in the
+output?  It is explicitly skipped:
 
-** yychar == YYEMPTY
+      /* Skip error token and tokens without identifier.  */
+      if (sym != errtoken && id)
+
+Of course there are issues with name spaces, but if we disable we have
+something which seems to be more simpler and more consistent instead
+of the special case YYERRCODE.
+
+   enum yytokentype {
+     error = 256,
+     // ...
+   };
+
+
+We could (should?) also treat the case of the undef_token, which is
+numbered 257 for yylex, and 2 internal.  Both appear for instance in
+toknum:
+
+  const unsigned short
+  parser::yytoken_number_[] =
+  {
+       0,   256,   257,   258,   259,   260,   261,   262,   263,   264,
+
+while here
+
+   enum yytokentype {
+     TOK_EOF = 0,
+     TOK_EQ = 258,
+
+so both 256 and 257 are "mysterious".
+
+  const char*
+  const parser::yytname_[] =
+  {
+  "\"end of command\"", "error", "$undefined", "\"=\"", "\"break\"",
+
+
+** yychar == yyempty_
 The code in yyerrlab reads:
 
       if (yychar <= YYEOF)
@@ -392,13 +171,10 @@ 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.
+** yysyntax_error
+The code bw glr.c and yacc.c is really alike, we can certainly factor
+some parts.
 
-We need trustworthy benchmarks for Bison, for all our backends.  Akim has a
-few things scattered around; we need to put them in the repo, and make them
-more useful.
 
 * Report
 
@@ -409,7 +185,7 @@ 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
@@ -426,37 +202,27 @@ undocumented ''features''.  Maybe an empty action ought to be
 presented too.  Shall we try to make a single grammar with all these
 features, or should we have several very small grammars?
 
+** --report=conflict-path
+Provide better assistance for understanding the conflicts by providing
+a sample text exhibiting the (LALR) ambiguity.  See the paper from
+DeRemer and Penello: they already provide the algorithm.
+
+** Statically check for potential ambiguities in GLR grammars.  See
+<http://www.i3s.unice.fr/~schmitz/papers.html#expamb> for an approach.
+
+
 * Extensions
-** More languages?
-Well, only if there is really some demand for it.
-
-*** PHP
-https://github.com/scfc/bison-php/blob/master/data/lalr1.php
-
-*** Python
-https://lists.gnu.org/r/bison-patches/2013-09/msg00000.html and following
-
 ** Multiple start symbols
-Would be very useful when parsing closely related languages.  The idea is to
-declare several start symbols, for instance
+Would be very useful when parsing closely related languages.
 
-    %start stmt expr
-    %%
-    stmt: ...
-    expr: ...
+** Better error messages
+The users are not provided with enough tools to forge their error messages.
+See for instance "Is there an option to change the message produced by
+YYERROR_VERBOSE?" by Simon Sobisch, on bison-help.
 
-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.
+See also
+https://www.cs.tufts.edu/~nr/cs257/archive/clinton-jefferey/lr-error-messages.pdf
+and https://research.swtch.com/yyerror.
 
 ** %include
 This is a popular demand.  We already made many changes in the parser that
@@ -465,12 +231,6 @@ 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.
 
@@ -497,10 +257,6 @@ 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
@@ -516,6 +272,35 @@ XML output for GNU Bison and gcc
 XML output for GNU Bison
    http://yaxx.sourceforge.net/
 
+** Counterexample generation
+https://lists.gnu.org/archive/html/bug-bison/2016-06/msg00000.html
+http://www.cs.cornell.edu/andru/papers/cupex/
+
+* Unit rules
+Maybe we could expand unit rules, 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?
+
+
+
+* 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:
 
@@ -533,7 +318,7 @@ 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?
@@ -545,7 +330,33 @@ 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).
 
-This is a prerequisite for modules.
+** RR conflicts
+See if we can use precedence between rules to solve RR conflicts.  See
+what POSIX says.
+
+
+* $undefined
+From Hans:
+- If the Bison generated parser experiences an undefined number in the
+character range, that character is written out in diagnostic messages, an
+addition to the $undefined value.
+
+Suggest: Change the name $undefined to undefined; looks better in outputs.
+
+
+* Default Action
+From Hans:
+- For use with my C++ parser, I transported the "switch (yyn)" statement
+that Bison writes to the bison.simple skeleton file. This way, I can remove
+the current default rule $$ = $1 implementation, which causes a double
+assignment to $$ which may not be OK under C++, replacing it with a
+"default:" part within the switch statement.
+
+Note that the default rule $$ = $1, when typed, is perfectly OK under C,
+but in the C++ implementation I made, this rule is different from
+$<type_name>$ = $<type_name>1. I therefore think that one should implement
+a Bison option where every typed default rule is explicitly written out
+(same typed ruled can of course be grouped together).
 
 * Pre and post actions.
 From: Florian Krohm <[email protected]>
@@ -578,6 +389,23 @@ 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
@@ -587,14 +415,20 @@ End:
 
 -----
 
-Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2020 Free Software
-Foundation, Inc.
+Copyright (C) 2001-2004, 2006, 2008-2015, 2018 Free Software Foundation,
+Inc.
 
 This file is part of Bison, the GNU Compiler Compiler.
 
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
-Texts.  A copy of the license is included in the "GNU Free
-Documentation License" file as part of this distribution.
+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/>.

bootstrap

@@ -1,10 +1,10 @@
 #! /bin/sh
 # Print a version string.
-scriptversion=2020-04-13.15; # UTC
+scriptversion=2018-10-13.05; # UTC
 
 # Bootstrap this package from checked-out sources.
 
-# Copyright (C) 2003-2020 Free Software Foundation, Inc.
+# Copyright (C) 2003-2018 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
@@ -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 -nv -A.po -P '%s' \
+"wget --mirror --level=1 -nd -q -A.po -P '%s' \
  https://translationproject.org/latest/%s/"
 
 # Prefer a non-empty tarname (4th argument of AC_INIT if given), else
@@ -963,16 +963,6 @@ fi
 bootstrap_post_import_hook \
   || die "bootstrap_post_import_hook failed"
 
-# Don't proceed if there are uninitialized submodules.  In particular,
-# the next step will remove dangling links, which might be links into
-# uninitialized submodules.
-#
-# Uninitialized submodules are listed with an initial dash.
-if $use_git && git submodule | grep '^-' >/dev/null; then
-  die "some git submodules are not initialized. "     \
-      "Run 'git submodule update --init' and bootstrap again."
-fi
-
 # Remove any dangling symlink matching "*.m4" or "*.[ch]" in some
 # gnulib-populated directories.  Such .m4 files would cause aclocal to fail.
 # The following requires GNU find 4.2.3 or newer.  Considering the usual

bootstrap.conf

@@ -1,6 +1,6 @@
 # Bootstrap configuration.
 
-# Copyright (C) 2006-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2006-2015, 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
@@ -17,45 +17,31 @@
 
 # gnulib modules used by this package.
 gnulib_modules='
-  argmatch array-list assert assure attribute
-  bitsetv
+  argmatch assert
   calloc-posix close closeout config-h c-strcase
   configmake
   dirname
-  error extensions
-  fdl fopen-safer fstrcmp
+  error extensions fdl fopen-safer
   getopt-gnu
-  gettext-h git-version-gen gitlog-to-changelog
-  gpl-3.0 intprops inttypes isnan javacomp-script
-  javaexec-script
-  ldexpl
-  libtextstyle-optional
-  linked-list
-  malloc-gnu
-  mbfile mbswidth
+  gettext git-version-gen gitlog-to-changelog
+  gpl-3.0 hash inttypes isnan javacomp-script
+  javaexec-script ldexpl malloc-gnu
+  mbswidth
   non-recursive-gnulib-prefix-hack
   obstack
   obstack-printf
   perror progname
   quote quotearg
-  rbtreehash-list
-  readline
   readme-release
   realloc-posix
-  relocatable-prog relocatable-script
-  rename
-  spawn-pipe stdbool stpcpy stpncpy strdup-posix strerror strverscmp
+  spawn-pipe stdbool stpcpy strdup-posix strerror strverscmp
   timevar
-  unicodeio unistd unistd-safer unlink unlocked-io
+  unistd unistd-safer unlink unlocked-io
   update-copyright unsetenv verify
   warnings
-  winsz-ioctl
-  winsz-termios
   xalloc
   xalloc-die
   xconcat-filename
-  xhash
-  xlist
   xmemdup0
   xstrndup
 
@@ -63,8 +49,6 @@ gnulib_modules='
   vsnprintf-posix vsprintf-posix
 '
 
-checkout_only_file=README-hacking.md
-
 # Additional xgettext options to use.  Use "\\\newline" to break lines.
 XGETTEXT_OPTIONS=$XGETTEXT_OPTIONS'\\\
  --from-code=UTF-8\\\
@@ -77,7 +61,24 @@ XGETTEXT_OPTIONS_RUNTIME=$XGETTEXT_OPTIONS'\\\
  --keyword=YY_ \\\
 '
 
-gnulib_tool_option_extras='--symlink --conditional-dependencies --makefile-name=gnulib.mk --po-base=gnulib-po --po-domain=bison'
+# Gettext supplies these files, but we don't need them since
+# we don't have an intl subdirectory.
+excluded_files='
+    m4/glibc2.m4
+    m4/intdiv0.m4
+    m4/intl.m4
+    m4/intldir.m4
+    m4/intmax.m4
+    m4/lcmessage.m4
+    m4/lock.m4
+    m4/longdouble.m4
+    m4/signed.m4
+    m4/uintmax_t.m4
+    m4/ulonglong.m4
+    m4/visibility.m4
+'
+
+gnulib_tool_option_extras='--symlink --makefile-name=gnulib.mk'
 
 bootstrap_post_import_hook()
 {
@@ -95,13 +96,6 @@ 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

@@ -23,8 +23,3 @@
 /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, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 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

build-aux/Linux.valgrind

@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 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

build-aux/cross-options.pl

@@ -1,24 +1,5 @@
 #! /usr/bin/env perl
 
-# Generate a release announcement message.
-
-# Copyright (C) 2007-2020 Free Software Foundation, Inc.
-#
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <https://www.gnu.org/licenses/>.
-#
-# Written by Akim Demaille.
-
 use warnings;
 use 5.005;
 use strict;
@@ -31,7 +12,7 @@ while (<STDIN>)
 {
     if (/^\s*             # Initial spaces.
         (?:(-\w),\s+)?    # $1: $short: Possible short option.
-        (--[-\w]+)        # $2: $long:  Mandatory long option.
+        (--[-\w]+)        # $2: $long:  Long option.
         (\[?)             # $3: $opt:   '[' iff the argument is optional.
         (?:=(\S+))?       # $4: $arg:   Possible argument name.
         \s                # Spaces.
@@ -51,6 +32,7 @@ while (<STDIN>)
             # if $opt, $arg contains the closing ].
             substr ($arg, -1) = ''
                 if $opt eq '[';
+            $arg =~ s/^=//;
             $arg = lc ($arg);
             my $dir_arg = $arg;
             # If the argument is complete (e.g., for --define[=NAME[=VALUE]]),
@@ -66,11 +48,7 @@ while (<STDIN>)
             # are strings and have the same syntax as on the command line.
             if ($dir_arg eq 'name[=value]')
             {
-                # -D/-F do not add quotes to the argument.
-                $dir_arg =
-                    $dir eq "%define"
-                    ? '@var{name} [@var{value}]'
-                    : '@var{name} ["@var{value}"]';
+                $dir_arg = '@var{name} ["@var{value}"]';
             }
             else
             {
@@ -90,15 +68,12 @@ while (<STDIN>)
 my $sep = '';
 foreach my $long (sort keys %option)
 {
-    # Couldn't find a means to escape @ in the format (for @item, @tab), so
-    # pass it as a literal to print.
-format STDOUT =
-@item @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @tab @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @tab @<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
-{
-  '@', '@option{' . $long . '}',
-  '@', $option{$long} ? ('@option{' . $option{$long} . '}') : '',
-  '@', $directive{$long} ? ('@code{' . $directive{$long} . '}') : ''
-}
-.
-    write;
+    # Avoid trailing spaces.
+    print $sep;
+    $sep = "\n";
+    print '@item @option{', $long, "}\n\@tab";
+    print ' @option{', $option{$long}, '}' if $option{$long};
+    print "\n\@tab";
+    print ' @code{', $directive{$long}, '}' if $directive{$long};
+    print "\n";
 }

build-aux/local.mk

@@ -1,4 +1,4 @@
-## Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2000-2015, 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

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, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2015, 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

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, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2015, 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

build-aux/update-test

@@ -1,122 +0,0 @@
-#! /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:
-        # Do not run s//SOMETHING/g (with an emty pattern), that won't
-        # work well...
-        if frm == []:
-            trace("no from for", match.group(1))
-            return
-        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)
-    if os.path.isdir(logfile):
-        logfile = os.path.join(logfile, 'testsuite.log')
-    process(logfile)

cfg.mk

@@ -1,5 +1,5 @@
 ## Customize maint.mk                           -*- makefile -*-
-## Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2008-2015, 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
@@ -26,9 +26,6 @@ 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*
@@ -51,7 +48,7 @@ gnulib_dir = $(srcdir)/gnulib
 bootstrap-tools = autoconf,automake,flex,gettext,gnulib
 
 announcement_Cc_ = \
-  [email protected], bison-announce@gnu.org, \
+  [email protected], [email protected], bison-patches@gnu.org, \
   [email protected]
 
 update-copyright: update-b4-copyright update-package-copyright-year
@@ -63,6 +60,18 @@ 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:
@@ -147,29 +156,23 @@ 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 $$,$$$$,exclude_file_name_regexp--sc_$(a))))
-
-$(call exclude,                                                                 \
-  bindtextdomain=^lib/main.c$$                                                  \
-  cast_of_argument_to_free=^src/muscle-tab.c$$                                  \
-  po_check=^tests|(^po/POTFILES.in|.md)$$                                       \
-  preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                  \
-  program_name=^lib/main.c$$                                                    \
-  prohibit_always-defined_macros=^data/skeletons/yacc.c$$                       \
-  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$              \
-  prohibit_always-defined_macros+=?|^tests/regression.at$$                      \
-  prohibit_doubled_word=^tests/named-refs.at$$                                  \
-  prohibit_magic_number_exit=^doc/bison.texi$$                                  \
-  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$              \
-  prohibit_strcmp=^doc/bison\.texi|examples|tests                               \
-  prohibit_tab_based_indentation=install-icc.sh|\.(am|mk)$$|^\.git|tests/input.at|Makefile$$   \
-  require_config_h=^(lib/yyerror|data/skeletons/(glr|yacc))\.c$$                \
-  require_config_h_first=^(lib/yyerror|data/skeletons/(glr|yacc))\.c$$          \
-  space_before_open_paren=^data/skeletons/                                      \
-  two_space_separator_in_usage=^(bootstrap|build-aux/install-icc.sh)            \
-  unmarked_diagnostics=^(doc/bison.texi$$|tests/c\+\+\.at$$)                    \
+$(call exclude,                                                                         \
+  bindtextdomain=^lib/main.c$$                                                          \
+  preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                          \
+  program_name=^lib/main.c$$                                                            \
+  prohibit_always-defined_macros=^data/yacc.c$$|^djgpp/                                 \
+  prohibit_always-defined_macros+=?|^src/(parse-gram.c|system.h)$$                      \
+  prohibit_always-defined_macros+=?|^tests/regression.at$$                              \
+  prohibit_always_true_header_tests=^djgpp/subpipe.h$$                                  \
+  prohibit_doubled_word=^tests/named-refs.at$$                                          \
+  prohibit_magic_number_exit=^doc/bison.texi$$                                          \
+  prohibit_magic_number_exit+=?|^tests/(conflicts|regression).at$$                      \
+  prohibit_strcmp=^doc/bison\.texi|tests/local\.at$$                                    \
+  prohibit_tab_based_indentation=install-icc.sh|\.(am|mk)$$|^djgpp/|^\.git|Makefile$$   \
+  require_config_h_first=^(lib/yyerror|data/(glr|yacc))\.c$$                            \
+  space_before_open_paren=^(data/|djgpp/)                                               \
+  two_space_separator_in_usage=^(bootstrap|build-aux/install-icc.sh)                    \
+  unmarked_diagnostics=^(djgpp/|doc/bison.texi$$|tests/c\+\+\.at$$)                     \
 )

configure.ac

@@ -1,6 +1,6 @@
 # Configure template for GNU Bison.                   -*-Autoconf-*-
 #
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 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
@@ -26,18 +26,15 @@ m4_pattern_allow([^BISON_USE_NLS$])
 
 AC_INIT([GNU Bison],
         m4_esyscmd([build-aux/git-version-gen .tarball-version]),
-        [[email protected]],
-        [],
-        [https://www.gnu.org/software/bison/])
-AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2020])
+        [[email protected]])
+AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2018])
 AC_DEFINE_UNQUOTED([PACKAGE_COPYRIGHT_YEAR], [$PACKAGE_COPYRIGHT_YEAR],
                    [The copyright year for this package])
 
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_MACRO_DIR([m4])
 
-# When we move to Automake 1.16, simplify examples/c/reccalc/local.mk.
-# Our CI build the packages on Bionic, which has only Automake 1.15.
+# We use Automake 1.14's %D% and %C%.
 #
 # We want gnits strictness only when rolling a stable release.  For
 # release candidates, we use version strings like 2.4.3_rc1, but gnits
@@ -45,7 +42,7 @@ AC_CONFIG_MACRO_DIR([m4])
 # releases, we want to be able run make dist without being required to
 # add a bogus NEWS entry.  In that case, the version string
 # automatically contains a dash, which we also let disable gnits.
-AM_INIT_AUTOMAKE([1.15 dist-lzip dist-xz nostdinc
+AM_INIT_AUTOMAKE([1.14 dist-xz nostdinc
                  color-tests parallel-tests
                  silent-rules]
                  m4_bmatch(m4_defn([AC_PACKAGE_VERSION]), [[-_]],
@@ -97,49 +94,11 @@ 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
-  # -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
+  warn_common='-Wall -Wextra -Wno-sign-compare -Wcast-align
     -fparse-all-comments -Wdocumentation
-    -Wformat -Wimplicit-fallthrough -Wnull-dereference
-    -Wno-sign-compare -Wno-tautological-constant-out-of-range-compare
-    -Wpointer-arith -Wshadow -Wstrict-aliasing
-    -Wwrite-strings
-    -wr188 -wr2259 -wr3179'
-  warn_c='-Wbad-function-cast
-    -Wmissing-prototypes
-    -Wstrict-prototypes'
-  warn_cxx='-Wextra-semi -Wnoexcept -Wold-style-cast -Wundefined-func-template
-    -Wweak-vtables'
+    -Wformat -Wnull-dereference -Wpointer-arith -Wwrite-strings'
+  warn_c='-Wbad-function-cast -Wshadow -Wstrict-prototypes'
+  warn_cxx='-Wnoexcept'
   # Warnings for the test suite only.
   #
   # -fno-color-diagnostics: Clang's use of colors in the error
@@ -151,11 +110,9 @@ 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
@@ -169,11 +126,6 @@ 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])
@@ -182,6 +134,8 @@ 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"])
 
@@ -193,7 +147,6 @@ if test "$enable_gcc_warnings" = yes; then
   CFLAGS=$save_CFLAGS
   AC_LANG_POP([C])
 
-
   AC_LANG_PUSH([C++])
   save_CXXFLAGS=$CXXFLAGS
   gl_WARN_ADD([-Werror=unknown-warning-option], [CXXFLAGS])
@@ -201,21 +154,8 @@ if test "$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;
@@ -236,34 +176,21 @@ 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
-if ! "$LEX_IS_FLEX" || test "X$LEX" = X:; then
+$LEX_IS_FLEX || test "X$LEX" = X: || {
   AC_MSG_WARN([bypassing lex because flex is required])
   LEX=:
-fi
-AM_CONDITIONAL([FLEX_WORKS], [$LEX_IS_FLEX && $FLEX_SUPPORTS_HEADER_OPT])
+}
 AM_CONDITIONAL([FLEX_CXX_WORKS],
-  [$LEX_IS_FLEX && $FLEX_SUPPORTS_HEADER_OPT && test $bison_cv_cxx_works = yes])
+  [$LEX_IS_FLEX && test $bison_cv_cxx_works = yes])
 AC_PROG_YACC
 AC_PROG_RANLIB
 AC_PROG_GNU_M4
@@ -271,6 +198,9 @@ AC_DEFINE_UNQUOTED([M4], ["$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])
@@ -287,14 +217,14 @@ 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([0.19])
+AM_GNU_GETTEXT_VERSION([0.18])
 BISON_I18N
-AC_CONFIG_FILES([gnulib-po/Makefile.in])
 
 # Internationalized parsers.
 AC_CONFIG_FILES([runtime-po/Makefile.in])
@@ -316,7 +246,7 @@ uname=`uname`
 case $VALGRIND:$uname in
   '':*) ;;
   *:Darwin)
-    # See README-hacking.md.
+    # See README-hacking.
     VALGRIND=;;
   *:*)
     suppfile=build-aux/$uname.valgrind
@@ -332,29 +262,14 @@ AC_MSG_RESULT([$suppfile])
 # Whether we cannot run the compiled bison.
 AM_CONDITIONAL([CROSS_COMPILING], [test "$cross_compiling" = yes])
 
-# Build bistromathic if we have the lib and both readline/readline.h
-# and readline/history.h.
-AM_CONDITIONAL([ENABLE_BISTROMATHIC],
-[test "$gl_cv_lib_readline" != no &&
-  test "$ac_cv_header_readline_readline_h" = yes &&
-  test "$ac_cv_header_readline_history_h" = yes])
-
 AM_MISSING_PROG([AUTOM4TE], [autom4te])
 # Needed by tests/atlocal.in.
 AC_SUBST([GCC])
 
+gt_JAVACOMP([1.7], [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

@@ -0,0 +1,72 @@
+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

@@ -1,207 +0,0 @@
-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 Notes 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 (e.g., `exp`, `NUM`, or `TOK_NUM` with api.token.prefix)
-  If `has_id`, the name of the token kind (prefixed by api.token.prefix if
-  defined), otherwise empty.  Guaranteed to be usable as a C identifier.
-  This is used to define the token kind (i.e., the enum used by the return
-  value of yylex).  Should be named `token_kind`.
-
-- `tag`: string
-  A human readable representation of the symbol.  Can be `'foo'`,
-  `'foo.id'`, `'"foo"'` etc.
-
-- `code`: integer
-  The token code associated to the token kind `id`.
-  The external number as used by yylex.  Can be ASCII code when a character,
-  some number chosen by bison, or some user number in the case of `%token
-  FOO <NUM>`.  Corresponds to `yychar` in `yacc.c`.
-
-- `is_token`: 0 or 1
-  Whether this is a terminal symbol.
-
-- `kind_base`: string (e.g., `YYSYMBOL_exp`, `YYSYMBOL_NUM`)
-  The base of the symbol kind, i.e., the enumerator of this symbol (token or
-  nonterminal) which is mapped to its `number`.
-
-- `kind`: string
-  Same as `kind_base`, but possibly with a prefix in some languages.  E.g.,
-  EOF's `kind_base` and `kind` are `YYSYMBOL_YYEOF` in C, but are
-  `S_YYEMPTY` and `symbol_kind::S_YYEMPTY` in C++.
-
-- `number`: integer
-  The code associated to the `kind`.
-  The internal number (computed from the external number by yytranslate).
-  Corresponds to yytoken in yacc.c.  This is the same number that serves as
-  key in b4_symbol(NUM, FIELD).
-
-  In bison, symbols are first assigned increasing numbers in order of
-  appearance (but tokens first, then nterms).  After grammar reduction,
-  unused nterms are then renumbered to appear last (i.e., first tokens, then
-  used nterms and finally unused nterms).  This final number NUM is the one
-  contained in this field, and it is the one used as key in `b4_symbol(NUM,
-  FIELD)`.
-
-  The code of the rule actions, however, is emitted before we know what
-  symbols are unused, so they use the original numbers.  To avoid confusion,
-  they actually use "orig NUM" instead of just "NUM".  bison also emits
-  definitions for `b4_symbol(orig NUM, number)` that map from original
-  numbers to the new ones.  `b4_symbol` actually resolves `orig NUM` in the
-  other case, i.e., `b4_symbol(orig 42, tag)` would return the tag of the
-  symbols whose original number was 42.
-
-- `has_type`: 0, 1
-  Whether has a semantic value.
-
-- `type_tag`: string
-  When api.value.type=union, the generated name for the union member.
-  yytype_INT etc. for symbols that has_id, otherwise yytype_1 etc.
-
-- `type`
-  If it has a semantic value, its type tag, or, if variant are used,
-  its type.
-  In the case of api.value.type=union, type is the real type (e.g. int).
-
-- `has_printer`: 0, 1
-- `printer`: string
-- `printer_file`: string
-- `printer_line`: integer
-- `printer_loc`: location
-  If the symbol has a printer, everything about it.
-
-- `has_destructor`, `destructor`, `destructor_file`, `destructor_line`, `destructor_loc`
-  Likewise.
-
-### `b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])`
-Expansion of $$, $1, $<TYPE-TAG>3, etc.
-
-The semantic value from a given VAL.
-- `VAL`: some semantic value storage (typically a union).  e.g., `yylval`
-- `SYMBOL-NUM`: the symbol number from which we extract the type tag.
-- `TYPE-TAG`, the user forced the `<TYPE-TAG>`.
-
-The result can be used safely, it is put in parens to avoid nasty precedence
-issues.
-
-### `b4_lhs_value(SYMBOL-NUM, [TYPE])`
-Expansion of `$$` or `$<TYPE>$`, for symbol `SYMBOL-NUM`.
-
-### `b4_rhs_data(RULE-LENGTH, POS)`
-The data corresponding to the symbol `#POS`, where the current rule has
-`RULE-LENGTH` symbols on RHS.
-
-### `b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])`
-Expansion of `$<TYPE>POS`, where the current rule has `RULE-LENGTH` symbols
-on RHS.
-
-<!--
-
-Local Variables:
-mode: markdown
-fill-column: 76
-ispell-dictionary: "american"
-End:
-
-Copyright (C) 2002, 2008-2015, 2018-2020 Free Software Foundation, Inc.
-
-This file is part of GNU Bison.
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
--->

data/bison-default.css

@@ -1,61 +0,0 @@
-/* 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; }
-
-/* Syntax error messages.  */
-.expected   { color: green; }
-.unexpected { color: red; }
-
-
-/* Counterexamples.  */
-
-/* Cex: point in rule.  */
-.cex-dot { color: red; }
-
-/* Cex: coloring various rules.  */
-.cex-0   { color: yellow; }
-.cex-1   { color: green; }
-.cex-2   { color: blue; }
-.cex-3   { color: purple; }
-.cex-4   { color: violet; }
-.cex-5   { color: orange; }
-.cex-6   { color: brown; }
-.cex-7   { color: mauve; }
-.cex-8   { color: #013220; } /* Dark green. */
-.cex-9   { color: #e75480; } /* Dark pink. */
-.cex-10  { color: cyan; }
-.cex-11  { color: orange; }
-
-/* Cex: derivation rewriting steps.  */
-.cex-step { font-style: italic; }
-
-/* Cex: leaves of a derivation.  */
-.cex-leaf { font-weight: 600; }

data/bison.m4

@@ -2,8 +2,7 @@
 
 # Language-independent M4 Macros for Bison.
 
-# Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2002, 2004-2015, 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
@@ -19,29 +18,6 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
-
-# m4_gsub(STRING, RE1, SUBST1, RE2, SUBST2, ...)
-# ----------------------------------------------
-# m4 equivalent of
-#
-#   $_ = STRING;
-#   s/RE1/SUBST1/g;
-#   s/RE2/SUBST2/g;
-#   ...
-#
-# Really similar to m4_bpatsubsts, but behaves properly with quotes.
-# See m4.at's "Generating Comments".  Super inelegant, but so far, I
-# did not find any better solution.
-m4_define([b4_gsub],
-[m4_bpatsubst(m4_bpatsubst(m4_bpatsubst([[[[$1]]]],
-                                        [$2], [$3]),
-                           [$4], [$5]),
-              [$6], [$7])])
-
-# m4_shift2 and m4_shift3 are provided by m4sugar.
-m4_define([m4_shift4], [m4_shift(m4_shift(m4_shift(m4_shift($@))))])
-
-
 ## ---------------- ##
 ## Identification.  ##
 ## ---------------- ##
@@ -95,9 +71,8 @@ version 2.2 of Bison.])
 # -------------
 # Issue a warning about private implementation details.
 m4_define([b4_disclaimer],
-[b4_comment([DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
-especially those whose name start with YY_ or yy_.  They are
-private implementation details that can be changed or removed.])
+[b4_comment([Undocumented macros, especially those whose name start with YY_,
+are private implementation details.  Do not rely on them.])
 ])
 
 
@@ -185,7 +160,7 @@ m4_define([b4_error],
 [b4_cat([[@complain][(]$1[@,]$2[@,]$3[@,]$4[]]dnl
 [m4_if([$#], [4], [],
        [m4_foreach([b4_arg],
-                   m4_dquote(m4_shift4($@)),
+                   m4_dquote(m4_shift(m4_shift(m4_shift(m4_shift($@))))),
                    [[@,]b4_arg])])[@)]])])
 
 # b4_warn(FORMAT, [ARG1], [ARG2], ...)
@@ -216,7 +191,7 @@ m4_define([b4_error],
 #   @warn(1@)
 #   @warn(1@,2@)
 m4_define([b4_warn],
-[b4_warn_at([], [], $@)])
+[b4_error([[warn]], [], [], $@)])
 
 # b4_warn_at(START, END, FORMAT, [ARG1], [ARG2], ...)
 # ---------------------------------------------------
@@ -234,7 +209,7 @@ m4_define([b4_warn_at],
 #
 # See b4_warn example.
 m4_define([b4_complain],
-[b4_complain_at([], [], $@)])
+[b4_error([[complain]], [], [], $@)])
 
 # b4_complain_at(START, END, FORMAT, [ARG1], [ARG2], ...)
 # -------------------------------------------------------
@@ -250,7 +225,8 @@ m4_define([b4_complain_at],
 #
 # See b4_warn example.
 m4_define([b4_fatal],
-[b4_fatal_at([], [], $@)])
+[b4_error([[fatal]], [], [], $@)dnl
+m4_exit(1)])
 
 # b4_fatal_at(START, END, FORMAT, [ARG1], [ARG2], ...)
 # ----------------------------------------------------
@@ -287,8 +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 (i.e., `_$0`) which prepends each
-# non-empty argument with a comma.
+# argument, then calls _b4_join which prepends each non-empty argument
+# with a comma.
 m4_define([b4_join],
 [m4_if([$#$1],
        [1], [],
@@ -393,88 +369,70 @@ m4_define([b4_$3_if],
 # Expand IF-TRUE, if FLAG is true, IF-FALSE otherwise.
 b4_define_flag_if([defines])            # Whether headers are requested.
 b4_define_flag_if([glr])                # Whether a GLR parser is requested.
-b4_define_flag_if([has_translations])   # Whether some tokens are internationalized.
 b4_define_flag_if([nondeterministic])   # Whether conflicts should be handled.
 b4_define_flag_if([token_table])        # Whether yytoken_table is demanded.
 b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
 
 
-# b4_glr_cc_if([IF-TRUE], [IF-FALSE])
-# -----------------------------------
-m4_define([b4_glr_cc_if],
-          [m4_if(b4_skeleton, ["glr.cc"], $@)])
-
-
 ## --------- ##
 ## Symbols.  ##
 ## --------- ##
 
-# For a description of the Symbol handling, see README.md.
+# 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
+# src/output.c:prepare_symbols_definitions().
 #
-# The following macros provide access to symbol related values.
-
-# __b4_symbol(NUM, FIELD)
-# -----------------------
-# Fetch FIELD of symbol #NUM.  Fail if undefined.
-m4_define([__b4_symbol],
-[m4_indir([b4_symbol($1, $2)])])
-
+# The various FIELDS are:
+#
+# - has_id: 0 or 1.
+#   Whether the symbol has an id.
+# - id: string
+#   If has_id, the id.  Guaranteed to be usable as a C identifier.
+#   Prefixed by api.token.prefix if defined.
+# - tag: string.
+#   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)
 # ----------------------
-# Fetch FIELD of symbol #NUM (or "orig NUM", see README.md).
-# Fail if undefined.
+# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
+# undefined.
 m4_define([_b4_symbol],
-[m4_ifdef([b4_symbol($1, number)],
-          [__b4_symbol(m4_indir([b4_symbol($1, number)]), $2)],
-          [__b4_symbol([$1], [$2])])])
+[m4_indir([b4_symbol($1, $2)])])
 
 
-# b4_symbol_token_kind(NUM)
-# -------------------------
-# The token kind of this symbol.
-m4_define([b4_symbol_token_kind],
-[b4_percent_define_get([api.token.prefix])dnl
-_b4_symbol([$1], [id])])
-
-
-# b4_symbol_kind_base(NUM)
-# ------------------------
-# Build the name of the kind of this symbol.  It must always exist,
-# otherwise some symbols might not be represented in the enum, which
-# might be compiled into too small a type to contain all the symbol
-# numbers.
-m4_define([b4_symbol_prefix], [b4_percent_define_get([api.symbol.prefix])])
-m4_define([b4_symbol_kind_base],
-[b4_percent_define_get([api.symbol.prefix])dnl
-m4_case([$1],
-  [-2],                             [[YYEMPTY]],
-  [0],                              [[YYEOF]],
-  [1],                              [[YYerror]],
-  [2],                              [[YYUNDEF]],
-  [m4_case(b4_symbol([$1], [tag]),
-      [$accept],                    [[YYACCEPT]],
-      [b4_symbol_if([$1], [has_id], _b4_symbol([$1], [id]),
-                                    [m4_bpatsubst([$1-][]_b4_symbol([$1], [tag]), [[^a-zA-Z_0-9]+], [_])])])])])
-
-
-# b4_symbol_kind(NUM)
-# -------------------
-# Same as b4_symbol_kind, but possibly with a prefix in some
-# languages.  E.g., EOF's kind_base and kind are YYSYMBOL_YYEOF in C,
-# but are S_YYEMPTY and symbol_kind::S_YYEMPTY in C++.
-m4_copy([b4_symbol_kind_base], [b4_symbol_kind])
-
 # b4_symbol(NUM, FIELD)
 # ---------------------
-# Fetch FIELD of symbol #NUM (or "orig NUM").  Fail if undefined.
-#
-# If FIELD = id, prepend the token prefix.
+# Recover a FIELD about symbol #NUM.  Thanks to m4_indir, fails if
+# undefined.  If FIELD = id, prepend the token prefix.
 m4_define([b4_symbol],
 [m4_case([$2],
-         [id],        [b4_symbol_token_kind([$1])],
-         [kind_base], [b4_symbol_kind_base([$1])],
-         [kind],      [b4_symbol_kind([$1])],
+         [id],    [m4_do([b4_percent_define_get([api.token.prefix])],
+                         [_b4_symbol([$1], [id])])],
          [_b4_symbol($@)])])
 
 
@@ -497,19 +455,26 @@ m4_define([b4_symbol_tag_comment],
 ])
 
 
-# b4_symbol_action(SYMBOL-NUM, ACTION)
-# ------------------------------------
-# Run the action ACTION ("destructor" or "printer") for SYMBOL-NUM.
+# 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)],
-                   [$1],
-                   [],
+                   b4_symbol_if([$1], [has_type],
+                                [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])])dnl
-b4_symbol([$1], [$2])
-b4_syncline([@oline@], [@ofile@])dnl
+b4_syncline([b4_symbol([$1], [$2_line])], [b4_symbol([$1], [$2_file])])
+      b4_symbol([$1], [$2])
+b4_syncline([@oline@], [@ofile@])
         break;
 
 b4_dollar_popdef[]dnl
@@ -523,31 +488,29 @@ m4_define([b4_symbol_destructor], [b4_symbol_action([$1], [destructor])])
 m4_define([b4_symbol_printer],    [b4_symbol_action([$1], [printer])])
 
 
-# b4_symbol_actions(ACTION, [KIND = yykind])
-# ------------------------------------------
-# Emit the symbol actions for ACTION ("destructor" or "printer").
-# Dispatch on KIND.
+# b4_symbol_actions(KIND, [TYPE = yytype])
+# ----------------------------------------
+# Emit the symbol actions for KIND ("printer" or "destructor").
+# Dispatch on TYPE.
 m4_define([b4_symbol_actions],
 [m4_pushdef([b4_actions_], m4_expand([b4_symbol_foreach([b4_symbol_$1])]))dnl
 m4_ifval(m4_defn([b4_actions_]),
-[switch (m4_default([$2], [yykind]))
+[switch (m4_default([$2], [yytype]))
     {
-m4_defn([b4_actions_])[]dnl
+      m4_defn([b4_actions_])
       default:
         break;
     }dnl
 ],
-[YYUSE (m4_default([$2], [yykind]));])dnl
+[YYUSE (m4_default([$2], [yytype]));])dnl
 m4_popdef([b4_actions_])dnl
 ])
 
 # _b4_symbol_case(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.
+# Issue a "case NUM" for SYMBOL-NUM.
 m4_define([_b4_symbol_case],
-[case b4_symbol([$1], [kind]): b4_symbol_tag_comment([$1])])
+[case b4_symbol([$1], [number]): b4_symbol_tag_comment([$1])])
 ])
 
 
@@ -567,14 +530,13 @@ m4_define([b4_symbol_map],
 
 # b4_token_visible_if(NUM, IF-TRUE, IF-FALSE)
 # -------------------------------------------
-# Whether NUM denotes a token kind that has an exported definition
-# (i.e., shows in enum yytokentype).
+# Whether NUM denotes a token that has an exported definition (i.e.,
+# shows in enum yytokentype).
 m4_define([b4_token_visible_if],
 [b4_symbol_if([$1], [is_token],
               [b4_symbol_if([$1], [has_id], [$2], [$3])],
               [$3])])
 
-
 # b4_token_has_definition(NUM)
 # ----------------------------
 # 1 if NUM is visible, nothing otherwise.
@@ -591,27 +553,13 @@ m4_define([b4_any_token_visible_if],
 
 # b4_token_format(FORMAT, NUM)
 # ----------------------------
-# If token NUM has a visible ID, format FORMAT with ID, USER_NUMBER.
 m4_define([b4_token_format],
 [b4_token_visible_if([$2],
-[m4_format([[$1]],
-           b4_symbol([$2], [id]),
-           b4_symbol([$2], b4_api_token_raw_if([[number]], [[code]])))])])
+[m4_quote(m4_format([$1],
+                     [b4_symbol([$2], [id])],
+                     [b4_symbol([$2], [user_number])]))])])
 
 
-# b4_last_enum_token
-# ------------------
-# The code of the last token visible token.
-m4_define([_b4_last_enum_token],
-[b4_token_visible_if([$1],
-   [m4_define([b4_last_enum_token], [$1])])])
-b4_symbol_foreach([_b4_last_enum_token])
-
-# b4_last_symbol
-# --------------
-# The code of the last symbol.
-m4_define([b4_last_symbol], m4_eval(b4_tokens_number + b4_nterms_number - 1))
-
 ## ------- ##
 ## Types.  ##
 ## ------- ##
@@ -621,7 +569,7 @@ m4_define([b4_last_symbol], m4_eval(b4_tokens_number + b4_nterms_number - 1))
 # 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(SYMBOL-NUM,
+# To specify the action to run, define b4_dollar_dollar(NUMBER,
 # TAG, TYPE).
 m4_define([_b4_type_action],
 [b4_symbol_if([$1], [has_type],
@@ -653,15 +601,12 @@ m4_define([b4_basename],
 [m4_bpatsubst([$1], [^.*/\([^/]+\)/*$], [\1])])
 
 
-# b4_syncline(LINE, FILE)dnl
-# --------------------------
-# Should always be following by a dnl.
-#
-# Emit "#line LINE FILE /* __LINE__ __FILE__ */".
+# b4_syncline(LINE, FILE)
+# -----------------------
 m4_define([b4_syncline],
 [b4_flag_if([synclines],
-[b4_sync_start([$1], [$2])[]dnl
-b4_sync_end([__line__], [b4_basename(m4_quote(__file__))])
+[b4_sync_start([$1], [$2]) b4_sync_end([__line__],
+                                       [b4_basename(m4_quote(__file__))])[]dnl
 ])])
 
 # b4_sync_start(LINE, FILE)
@@ -673,17 +618,7 @@ 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])]
-)
-# 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 developers 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])
+m4_define([b4_sync_end],   [b4_comment([$2:$1])])
 
 
 # b4_user_code(USER-CODE)
@@ -758,7 +693,7 @@ m4_define([b4_check_user_names],
 [m4_pushdef([b4_occurrence], b4_occurrence)dnl
 m4_pushdef([b4_user_name], m4_car(b4_occurrence))dnl
 m4_pushdef([b4_start], m4_car(m4_shift(b4_occurrence)))dnl
-m4_pushdef([b4_end], m4_shift2(b4_occurrence))dnl
+m4_pushdef([b4_end], m4_shift(m4_shift(b4_occurrence)))dnl
 m4_ifndef($3[(]m4_quote(b4_user_name)[)],
           [b4_complain_at([b4_start], [b4_end],
                           [[%s '%s' is not used]],
@@ -833,10 +768,8 @@ 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)dnl
-# -------------------------------------------
-# Should always be following by a dnl.
-#
+# b4_percent_define_get_syncline(VARIABLE)
+# ----------------------------------------
 # Mimic muscle_percent_define_get_syncline in ../src/muscle-tab.h exactly.
 # That is, if the %define variable VARIABLE is undefined, complain fatally
 # since that's a Bison or skeleton error.  Otherwise, return its definition
@@ -1050,9 +983,10 @@ 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 blocks.]]],
-                  [[["%code ]$1[" blocks.]]]))
-b4_user_code([m4_indir(b4_macro_name)])])dnl
+[b4_comment([m4_if([$#], [0], [[Unqualified %code]],
+                   [["%code ]$1["]])[ blocks.]])
+b4_user_code([m4_indir(b4_macro_name)])
+])dnl
 m4_popdef([b4_macro_name])])
 
 # b4_percent_code_ifdef(QUALIFIER, IF-TRUE, [IF-FALSE])
@@ -1076,7 +1010,6 @@ 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])
@@ -1091,23 +1024,21 @@ m4_define([b4_bison_locations_if],
 [b4_locations_if([b4_percent_define_ifdef([[api.location.type]], [], [$1])])])
 
 
-
-# %define parse.error "(custom|detailed|simple|verbose)"
+# b4_error_verbose_if([IF-ERRORS-ARE-VERBOSE], [IF-NOT])
 # ------------------------------------------------------
+# Map %define parse.error "(simple|verbose)" to b4_error_verbose_if and
+# b4_error_verbose_flag.
 b4_percent_define_default([[parse.error]], [[simple]])
 b4_percent_define_check_values([[[[parse.error]],
-                                 [[custom]], [[detailed]], [[simple]], [[verbose]]]])
-
-# b4_parse_error_case(CASE1, THEN1, CASE2, THEN2, ..., ELSE)
-# ----------------------------------------------------------
-m4_define([b4_parse_error_case],
-[m4_case(b4_percent_define_get([[parse.error]]), $@)])
-
-# b4_parse_error_bmatch(PATTERN1, THEN1, PATTERN2, THEN2, ..., ELSE)
-# ------------------------------------------------------------------
-m4_define([b4_parse_error_bmatch],
-[m4_bmatch(b4_percent_define_get([[parse.error]]), $@)])
+                                 [[simple]], [[verbose]]]])
+m4_define([b4_error_verbose_flag],
+          [m4_case(b4_percent_define_get([[parse.error]]),
+                   [simple],  [[0]],
+                   [verbose], [[1]])])
+b4_define_flag_if([error_verbose])
 
+# yytoken_table is needed to support verbose errors.
+b4_error_verbose_if([m4_define([b4_token_table_flag], [1])])
 
 
 # b4_variant_if([IF-VARIANT-ARE-USED], [IF-NOT])
@@ -1155,10 +1086,10 @@ m4_define_default([b4_location_initial_line],   [1])
 ## Sanity checks.  ##
 ## --------------- ##
 
-# api.location.type={...} (C, C++ and Java).
+# api.location.prefix={...} (Java and C++).
 b4_percent_define_check_kind([api.location.type], [code], [deprecated])
 
-# api.position.type={...} (Java).
+# api.position.prefix={...} (Java).
 b4_percent_define_check_kind([api.position.type], [code], [deprecated])
 
 # api.prefix >< %name-prefix.
@@ -1193,11 +1124,3 @@ b4_percent_define_ifdef([api.value.type],
 
 # api.value.union.name.
 b4_percent_define_check_kind([api.value.union.name], [keyword])
-
-# parse.error (custom|detailed) >< token-table.
-b4_token_table_if(
-[b4_parse_error_bmatch([custom\|detailed],
-[b4_complain_at(b4_percent_define_get_loc([parse.error]),
-                [['%s' and '%s' cannot be used together]],
-                [%token-table],
-                [%define parse.error (custom|detailed)])])])

data/c++-skel.m4

@@ -2,8 +2,8 @@
 
 # C++ skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
-# Foundation, Inc.
+# Copyright (C) 2006-2007, 2009-2015, 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
@@ -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_skeletonsdir/[glr.cc]])])
-b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.cc]])])
+b4_glr_if(             [m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.cc]])])
+b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.cc]])])
 
-m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.cc]])
+m4_define_default([b4_used_skeleton], [b4_pkgdatadir/[lalr1.cc]])
 m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
 
 m4_include(b4_used_skeleton)

data/c++.m4

@@ -2,7 +2,7 @@
 
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2018 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
@@ -22,12 +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++])])
 
-b4_percent_define_default([[api.symbol.prefix]], [[S_]])
-
-m4_include(b4_skeletonsdir/[c.m4])
+m4_include(b4_pkgdatadir/[c.m4])
 
 b4_percent_define_check_kind([api.namespace], [code], [deprecated])
-b4_percent_define_check_kind([api.parser.class], [code], [deprecated])
+b4_percent_define_check_kind([parser_class_name], [code], [deprecated])
 
 
 ## ----- ##
@@ -74,22 +72,6 @@ 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
 ])
 
@@ -98,14 +80,14 @@ m4_define([b4_cxx_portability],
 ## Default values.  ##
 ## ---------------- ##
 
-b4_percent_define_default([[api.parser.class]], [[parser]])
+b4_percent_define_default([[parser_class_name]], [[parser]])
 
 # Don't do that so that we remember whether we're using a user
 # request, or the default value.
 #
 # b4_percent_define_default([[api.location.type]], [[location]])
 
-b4_percent_define_default([[api.filename.type]], [[const std::string]])
+b4_percent_define_default([[filename_type]], [[std::string]])
 # Make it a warning for those who used betas of Bison 3.0.
 b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))
 
@@ -149,55 +131,33 @@ 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]])dnl
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
 [namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
                                                 [^\(.\)[	 ]*::], [\1])),
                          [::], [ { namespace ])[ {]])])
 
 m4_define([b4_namespace_close],
-[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
 m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
                                     [^\(.\)[	 ]*\(::\)?\([^][:]\|:[^:]\)*],
                                     [\1])),
              [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])
 
 
-## ------------- ##
-## Token kinds.  ##
-## ------------- ##
-
-
 # b4_token_enums
 # --------------
-# Output the definition of the token kinds.
+# Output the definition of the tokens as enums.
 m4_define([b4_token_enums],
-[[enum token_kind_type
+[[enum yytokentype
       {
-        ]b4_symbol([-2], [id])[ = -2,
-]b4_symbol_foreach([b4_token_enum])dnl
-[      };]dnl
+        ]m4_join([,
+        ],
+                 b4_symbol_map([b4_token_enum]))[
+      };]dnl
 ])
 
 
 
-## -------------- ##
-## Symbol kinds.  ##
-## -------------- ##
-
-# b4_declare_symbol_enum
-# ----------------------
-# The definition of the symbol internal numbers as an enum.
-# Defining YYEMPTY here is important: it forces the compiler
-# to use a signed type, which matters for yytoken.
-m4_define([b4_declare_symbol_enum],
-[[enum symbol_kind_type
-      {
-        YYNTOKENS = ]b4_tokens_number[, ///< Number of tokens.
-        ]b4_symbol(-2, kind_base)[ = -2,
-]b4_symbol_foreach([      b4_symbol_enum])dnl
-[      };]])
-
-
 
 ## ----------------- ##
 ## Semantic Values.  ##
@@ -218,7 +178,7 @@ m4_define([b4_value_type_declare],
 [union\|union-directive],
 [[    union semantic_type
     {
-]b4_user_union_members[
+    ]b4_user_union_members[
     };]])])dnl
 ])
 
@@ -240,58 +200,39 @@ 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)
-        : 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([
-
+      syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m);]b4_locations_if([
       location_type location;])[
     };
 
-    /// Token kinds.
+    /// Tokens.
     struct token
     {
       ]b4_token_enums[
-      /// Backward compatibility alias (Bison 3.6).
-      typedef token_kind_type yytokentype;
     };
 
-    /// Token kind, as returned by yylex.
-    typedef token::yytokentype token_kind_type;
+    /// (External) token type, as returned by yylex.
+    typedef token::yytokentype token_type;
 
-    /// Backward compatibility alias (Bison 3.6).
-    typedef token_kind_type token_type;
+    /// Symbol type: an internal symbol number.
+    typedef int symbol_number_type;
 
-    /// Symbol kinds.
-    struct symbol_kind
-    {
-      ]b4_declare_symbol_enum[
-    };
+    /// The symbol type number to denote an empty symbol.
+    enum { empty_symbol = -2 };
 
-    /// (Internal) symbol kind.
-    typedef symbol_kind::symbol_kind_type symbol_kind_type;
-
-    /// The number of tokens.
-    static const symbol_kind_type YYNTOKENS = symbol_kind::YYNTOKENS;
+    /// Internal symbol number for tokens (subsumed by symbol_number_type).
+    typedef ]b4_int_type_for([b4_translate])[ token_number_type;
 ]])
 
 
-# b4_symbol_type_define
-# ---------------------
+# b4_symbol_type_declare
+# ----------------------
 # Define symbol_type, the external type for symbols used for symbol
 # constructors.
-m4_define([b4_symbol_type_define],
+m4_define([b4_symbol_type_declare],
 [[    /// A complete symbol.
     ///
-    /// Expects its Base type to provide access to the symbol kind
-    /// via kind ().
+    /// Expects its Base type to provide access to the symbol type
+    /// via type_get ().
     ///
     /// Provide access to semantic value]b4_locations_if([ and location])[.
     template <typename Base>
@@ -301,28 +242,14 @@ m4_define([b4_symbol_type_define],
       typedef Base super_type;
 
       /// Default constructor.
-      basic_symbol ()
-        : value ()]b4_locations_if([
-        , location ()])[
-      {}
+      basic_symbol ();
 
-#if 201103L <= YY_CPLUSPLUS
-      /// Move constructor.
-      basic_symbol (basic_symbol&& that)
-        : Base (std::move (that))
-        , value (]b4_variant_if([], [std::move (that.value)]))b4_locations_if([
-        , location (std::move (that.location))])[
-      {]b4_variant_if([
-        b4_symbol_variant([this->kind ()], [value], [move],
-                          [std::move (that.value)])
-      ])[}
-#endif
-
-      /// Copy constructor.
-      basic_symbol (const basic_symbol& that);]b4_variant_if([[
+      /// Move or copy constructor.
+      basic_symbol (YY_RVREF (basic_symbol) other);
 
+]b4_variant_if([[
       /// Constructor for valueless symbols, and symbols from each type.
-]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
+]b4_type_foreach([b4_basic_symbol_constructor_declare])], [[
       /// Constructor for valueless symbols.
       basic_symbol (typename Base::kind_type t]b4_locations_if([,
                     YY_MOVE_REF (location_type) l])[);
@@ -330,61 +257,16 @@ m4_define([b4_symbol_type_define],
       /// 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 ()
-      {
-        clear ();
-      }
+      ~basic_symbol ();
 
       /// Destroy contents, and record that is empty.
-      void clear ()
-      {]b4_variant_if([[
-        // User destructor.
-        symbol_kind_type yykind = this->kind ();
-        basic_symbol<Base>& yysym = *this;
-        (void) yysym;
-        switch (yykind)
-        {
-]b4_symbol_foreach([b4_symbol_destructor])dnl
-[       default:
-          break;
-        }
-
-        // Value type destructor.
-]b4_symbol_variant([[yykind]], [[value]], [[template destroy]])])[
-        Base::clear ();
-      }
-
-]b4_parse_error_bmatch(
-[custom\|detailed],
-[[      /// The user-facing name of this symbol.
-      const char *name () const YY_NOEXCEPT
-      {
-        return ]b4_parser_class[::symbol_name (this->kind ());
-      }]],
-[simple],
-[[#if ]b4_api_PREFIX[DEBUG || ]b4_token_table_flag[
-      /// The user-facing name of this symbol.
-      const char *name () const YY_NOEXCEPT
-      {
-        return ]b4_parser_class[::symbol_name (this->kind ());
-      }
-#endif // #if ]b4_api_PREFIX[DEBUG || ]b4_token_table_flag[
-]],
-[verbose],
-[[      /// The user-facing name of this symbol.
-      std::string name () const YY_NOEXCEPT
-      {
-        return ]b4_parser_class[::symbol_name (this->kind ());
-      }]])[
-
-      /// Backward compatibility (Bison 3.6).
-      symbol_kind_type type_get () const YY_NOEXCEPT;
+      void clear ();
 
       /// Whether empty.
-      bool empty () const YY_NOEXCEPT;
+      bool empty () const;
 
       /// Destructive move, \a s is emptied into this.
       void move (basic_symbol& s);
@@ -398,63 +280,46 @@ m4_define([b4_symbol_type_define],
     private:
 #if YY_CPLUSPLUS < 201103L
       /// Assignment operator.
-      basic_symbol& operator= (const basic_symbol& that);
+      basic_symbol& operator= (const basic_symbol& other);
 #endif
     };
 
     /// Type access provider for token (enum) based symbols.
-    struct by_kind
+    struct by_type
     {
       /// Default constructor.
-      by_kind ();
-
-#if 201103L <= YY_CPLUSPLUS
-      /// Move constructor.
-      by_kind (by_kind&& that);
-#endif
+      by_type ();
 
       /// Copy constructor.
-      by_kind (const by_kind& that);
+      by_type (const by_type& other);
 
-      /// The symbol kind as needed by the constructor.
-      typedef token_kind_type kind_type;
+      /// The symbol type as needed by the constructor.
+      typedef token_type kind_type;
 
       /// Constructor from (external) token numbers.
-      by_kind (kind_type t);
+      by_type (kind_type t);
 
       /// Record that this symbol is empty.
       void clear ();
 
-      /// Steal the symbol kind from \a that.
-      void move (by_kind& that);
+      /// Steal the symbol type from \a that.
+      void move (by_type& that);
 
       /// The (internal) type number (corresponding to \a type).
       /// \a empty when empty.
-      symbol_kind_type kind () const YY_NOEXCEPT;
+      symbol_number_type type_get () const;
 
-      /// Backward compatibility (Bison 3.6).
-      symbol_kind_type type_get () const YY_NOEXCEPT;
+      /// The token.
+      token_type token () const;
 
-      /// The symbol kind.
-      /// \a ]b4_symbol_prefix[YYEMPTY when empty.
-      symbol_kind_type kind_;
+      /// The symbol type.
+      /// \a empty_symbol when empty.
+      /// An int, not token_number_type, to be able to store empty_symbol.
+      int type;
     };
 
-    /// Backward compatibility for a private implementation detail (Bison 3.6).
-    typedef by_kind by_type;
-
     /// "External" symbols: returned by the scanner.
-    struct symbol_type : basic_symbol<by_kind>
-    {]b4_variant_if([[
-      /// Superclass.
-      typedef basic_symbol<by_kind> super_type;
-
-      /// Empty symbol.
-      symbol_type () {}
-
-      /// Constructor for valueless symbols, and symbols from each type.
-]b4_type_foreach([_b4_token_constructor_define])dnl
-    ])[};
+    typedef basic_symbol<by_type> symbol_type;
 ]])
 
 
@@ -462,21 +327,34 @@ m4_define([b4_symbol_type_define],
 # -----------------------------
 # Provide the implementation needed by the public types.
 m4_define([b4_public_types_define],
-[[  // basic_symbol.
-  template <typename Base>
-  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (const basic_symbol& that)
-    : Base (that)
-    , value (]b4_variant_if([], [that.value]))b4_locations_if([
-    , location (that.location)])[
-  {]b4_variant_if([
-    b4_symbol_variant([this->kind ()], [value], [copy],
-                      [YY_MOVE (that.value)])
-  ])[}
+[  b4_inline([$1])b4_parser_class_name[::syntax_error::syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
+    : std::runtime_error (m)]b4_locations_if([
+    , location (l)])[
+  {}
 
-]b4_variant_if([], [[
+  // basic_symbol.
+  template <typename Base>
+  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol ()
+    : value ()]b4_locations_if([
+    , 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],
+                      [YY_MOVE (other.value)])])[
+  }
+
+]b4_variant_if([[
+  // Implementation of basic_symbol constructor for each type.
+]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
   /// Constructor for valueless symbols.
   template <typename Base>
-  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
+  ]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
           [typename Base::kind_type t],
           b4_locations_if([YY_MOVE_REF (location_type) l]))[)
     : Base (t)
@@ -485,7 +363,7 @@ m4_define([b4_public_types_define],
   {}
 
   template <typename Base>
-  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
+  ]b4_parser_class_name[::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]))[)
@@ -494,86 +372,109 @@ m4_define([b4_public_types_define],
     , location (YY_MOVE (l))])[
   {]b4_variant_if([[
     (void) v;
-    ]b4_symbol_variant([this->kind ()], [value], [YY_MOVE_OR_COPY], [YY_MOVE (v)])])[}]])[
+    ]b4_symbol_variant([this->type_get ()], [value], [YY_MOVE_OR_COPY], [YY_MOVE (v)])])[}]])[
 
   template <typename Base>
-  ]b4_parser_class[::symbol_kind_type
-  ]b4_parser_class[::basic_symbol<Base>::type_get () const YY_NOEXCEPT
+  ]b4_parser_class_name[::basic_symbol<Base>::~basic_symbol ()
   {
-    return this->kind ();
-  }
-
-  template <typename Base>
-  bool
-  ]b4_parser_class[::basic_symbol<Base>::empty () const YY_NOEXCEPT
-  {
-    return this->kind () == ]b4_symbol(-2, kind)[;
+    clear ();
   }
 
   template <typename Base>
   void
-  ]b4_parser_class[::basic_symbol<Base>::move (basic_symbol& s)
+  ]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
+  {
+    return Base::type_get () == empty_symbol;
+  }
+
+  template <typename Base>
+  void
+  ]b4_parser_class_name[::basic_symbol<Base>::move (basic_symbol& s)
   {
     super_type::move (s);
-    ]b4_variant_if([b4_symbol_variant([this->kind ()], [value], [move],
+    ]b4_variant_if([b4_symbol_variant([this->type_get ()], [value], [move],
                                       [YY_MOVE (s.value)])],
                    [value = YY_MOVE (s.value);])[]b4_locations_if([
     location = YY_MOVE (s.location);])[
   }
 
-  // by_kind.
-  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind ()
-    : kind_ (]b4_symbol(-2, kind)[)
+  // by_type.
+  ]b4_inline([$1])b4_parser_class_name[::by_type::by_type ()
+    : type (empty_symbol)
   {}
 
-#if 201103L <= YY_CPLUSPLUS
-  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (by_kind&& that)
-    : kind_ (that.kind_)
-  {
-    that.clear ();
-  }
-#endif
-
-  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (const by_kind& that)
-    : kind_ (that.kind_)
+  ]b4_inline([$1])b4_parser_class_name[::by_type::by_type (const by_type& other)
+    : type (other.type)
   {}
 
-  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (token_kind_type t)
-    : kind_ (yytranslate_ (t))
+  ]b4_inline([$1])b4_parser_class_name[::by_type::by_type (token_type t)
+    : type (yytranslate_ (t))
   {}
 
   ]b4_inline([$1])[void
-  ]b4_parser_class[::by_kind::clear ()
+  ]b4_parser_class_name[::by_type::clear ()
   {
-    kind_ = ]b4_symbol(-2, kind)[;
+    type = empty_symbol;
   }
 
   ]b4_inline([$1])[void
-  ]b4_parser_class[::by_kind::move (by_kind& that)
+  ]b4_parser_class_name[::by_type::move (by_type& that)
   {
-    kind_ = that.kind_;
+    type = that.type;
     that.clear ();
   }
 
-  ]b4_inline([$1])[]b4_parser_class[::symbol_kind_type
-  ]b4_parser_class[::by_kind::kind () const YY_NOEXCEPT
+  ]b4_inline([$1])[int
+  ]b4_parser_class_name[::by_type::type_get () const
   {
-    return kind_;
+    return type;
   }
-
-  ]b4_inline([$1])[]b4_parser_class[::symbol_kind_type
-  ]b4_parser_class[::by_kind::type_get () const YY_NOEXCEPT
+]b4_token_ctor_if([[
+  ]b4_inline([$1])b4_parser_class_name[::token_type
+  ]b4_parser_class_name[::by_type::token () const
   {
-    return this->kind ();
+    // 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_token_constructor_define
-# ----------------------------
-# Define symbol constructors for all the value types.
+# b4_symbol_constructor_declare
+# b4_symbol_constructor_define
+# -----------------------------
+# Declare/define symbol constructors for all the value types.
 # Use at class-level.  Redefined in variant.hh.
-m4_define([b4_token_constructor_define], [])
+m4_define([b4_symbol_constructor_declare], [])
+m4_define([b4_symbol_constructor_define], [])
 
 
 # b4_yytranslate_define(cc|hh)
@@ -581,41 +482,41 @@ m4_define([b4_token_constructor_define], [])
 # Define yytranslate_.  Sometimes used in the header file ($1=hh),
 # sometimes in the cc file.
 m4_define([b4_yytranslate_define],
-[  b4_inline([$1])b4_parser_class[::symbol_kind_type
-  ]b4_parser_class[::yytranslate_ (int t)
+[[  // Symbol number corresponding to token number t.
+  ]b4_inline([$1])b4_parser_class_name[::token_number_type
+  ]b4_parser_class_name[::yytranslate_ (]b4_token_ctor_if([token_type],
+                                                          [int])[ t)
   {
-]b4_api_token_raw_if(
-[[    return static_cast<symbol_kind_type> (t);]],
-[[    // YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to
-    // TOKEN-NUM as returned by yylex.
     static
-    const ]b4_int_type_for([b4_translate])[
+    const token_number_type
     translate_table[] =
     {
-  ]b4_translate[
+]b4_translate[
     };
-    // Last valid token kind.
-    const int code_max = ]b4_code_max[;
+    const unsigned user_token_number_max_ = ]b4_user_token_number_max[;
+    const token_number_type undef_token_ = ]b4_undef_token_number[;
 
-    if (t <= 0)
-      return symbol_kind::]b4_symbol_prefix[YYEOF;
-    else if (t <= code_max)
-      return YY_CAST (symbol_kind_type, translate_table[t]);
+    if (static_cast<int> (t) <= yyeof_)
+      return yyeof_;
+    else if (static_cast<unsigned> (t) <= user_token_number_max_)
+      return translate_table[t];
     else
-      return symbol_kind::]b4_symbol_prefix[YYUNDEF;]])[
+      return undef_token_;
   }
 ]])
 
 
 # b4_lhs_value([TYPE])
 # --------------------
+# Expansion of $<TYPE>$.
 m4_define([b4_lhs_value],
 [b4_symbol_value([yyval], [$1])])
 
 
-# b4_rhs_value(RULE-LENGTH, POS, [TYPE])
+# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
 # --------------------------------------
-# FIXME: Dead code.
+# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
+# symbols on RHS.
 m4_define([b4_rhs_value],
 [b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])
 
@@ -627,9 +528,9 @@ m4_define([b4_lhs_location],
 [(yyloc)])
 
 
-# b4_rhs_location(RULE-LENGTH, POS)
+# b4_rhs_location(RULE-LENGTH, NUM)
 # ---------------------------------
-# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],
 [(yylocation_stack_@{($1) - ($2)@})])
@@ -702,7 +603,7 @@ m4_define([b4_yylloc_default_define],
         {                                                               \
           (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
         }                                                               \
-    while (false)
+    while (/*CONSTCOND*/ false)
 # endif
 ]])
 

data/c-like.m4

@@ -2,7 +2,7 @@
 
 # Common code for C-like languages (C, C++, Java, etc.)
 
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 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
@@ -17,21 +17,15 @@
 # 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]).
-# Turn "*/" in TEXT into "* /" so that we don't unexpectedly close
-# the comments before its end.
 #
 # Prefix all the output lines with PREFIX.
 m4_define([_b4_comment],
-[$2[]b4_gsub(m4_expand([$1]),
-            [[*]/], [*\\/],
-            [/[*]], [/\\*],
-            [
+[$2[]m4_bpatsubst(m4_expand([[$1]]), [
 \(.\)], [
 $3\1])$4])
 
@@ -45,26 +39,25 @@ m4_define([b4_comment],
 
 
 
-# _b4_dollar_dollar(VALUE, SYMBOL-NUM, FIELD, DEFAULT-FIELD)
-# ----------------------------------------------------------
+# _b4_dollar_dollar(VALUE, FIELD, DEFAULT-FIELD)
+# ----------------------------------------------
 # If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
-# otherwise just VALUE.  Be sure to pass "(VALUE)" if VALUE is a
+# otherwise just VALUE.  Be sure to pass "(VALUE)" is VALUE is a
 # pointer.
 m4_define([_b4_dollar_dollar],
 [b4_symbol_value([$1],
-                 [$2],
-                 m4_if([$3], [[]],
-                       [[$4]], [[$3]]))])
+                 m4_if([$2], [[]],
+                       [[$3]], [[$2]]))])
 
-# b4_dollar_pushdef(VALUE-POINTER, SYMBOL-NUM, [TYPE_TAG], LOCATION)
+# b4_dollar_pushdef(VALUE-POINTER, DEFAULT-FIELD, LOCATION)
 # b4_dollar_popdef
-# ------------------------------------------------------------------
-# Define b4_dollar_dollar for VALUE-POINTER and DEFAULT-FIELD,
+# ---------------------------------------------------------
+# Define b4_dollar_dollar for VALUE and DEFAULT-FIELD,
 # and b4_at_dollar for LOCATION.
 m4_define([b4_dollar_pushdef],
 [m4_pushdef([b4_dollar_dollar],
-            [_b4_dollar_dollar([$1], [$2], m4_dquote($][1), [$3])])dnl
-m4_pushdef([b4_at_dollar], [$4])dnl
+            [_b4_dollar_dollar([$1], m4_dquote($][1), [$2])])dnl
+m4_pushdef([b4_at_dollar], [$3])dnl
 ])
 m4_define([b4_dollar_popdef],
 [m4_popdef([b4_at_dollar])dnl

data/c-skel.m4

@@ -2,8 +2,8 @@
 
 # C skeleton dispatching for Bison.
 
-# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
-# Foundation, Inc.
+# Copyright (C) 2006-2007, 2009-2015, 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
@@ -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_skeletonsdir/[glr.c]])])
-b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.c]])])
+b4_glr_if(             [m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.c]])])
+b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_pkgdatadir/[glr.c]])])
 
-m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[yacc.c]])
+m4_define_default([b4_used_skeleton], [b4_pkgdatadir/[yacc.c]])
 m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
 
 m4_include(b4_used_skeleton)

data/c.m4

@@ -2,8 +2,7 @@
 
 # C M4 Macros for Bison.
 
-# Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2002, 2004-2015, 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
@@ -18,7 +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_skeletonsdir/[c-like.m4])
+m4_include(b4_pkgdatadir/[c-like.m4])
 
 # b4_tocpp(STRING)
 # ----------------
@@ -101,7 +100,6 @@ m4_define_default([b4_prefix], [b4_api_prefix])
 b4_percent_define_default([[api.value.union.name]],
                           [b4_api_PREFIX[][STYPE]])
 
-b4_percent_define_default([[api.symbol.prefix]], [[YYSYMBOL_]])
 
 ## ------------------------ ##
 ## Pure/impure interfaces.  ##
@@ -130,13 +128,6 @@ m4_define([b4_user_args],
 [m4_ifset([b4_parse_param], [, b4_args(b4_parse_param)])])
 
 
-# b4_user_formals
-# ---------------
-# The possible parse-params formal arguments preceded by a comma.
-m4_define([b4_user_formals],
-[m4_ifset([b4_parse_param], [, b4_formals(b4_parse_param)])])
-
-
 # b4_parse_param
 # --------------
 # If defined, b4_parse_param arrives double quoted, but below we prefer
@@ -175,158 +166,38 @@ b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
 
 # b4_int_type(MIN, MAX)
 # ---------------------
-# Return a narrow int type able to handle integers ranging from MIN
-# to MAX (included) in portable C code.  Assume MIN and MAX fall in
-# 'int' range.
+# 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($@,   [-127],   [127]), [1], [signed char],
-       b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
+[m4_if(b4_ints_in($@,      [0],   [255]), [1], [unsigned char],
+       b4_ints_in($@,   [-128],   [127]), [1], [signed 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
-[#ifdef short
-# undef short
-#endif
-
-/* 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_sizes_types_define
-# ---------------------
-# Define YYPTRDIFF_T/YYPTRDIFF_MAXIMUM, YYSIZE_T/YYSIZE_MAXIMUM,
-# and YYSIZEOF.
-m4_define([b4_sizes_types_define],
-[[#ifndef YYPTRDIFF_T
-# if defined __PTRDIFF_TYPE__ && defined __PTRDIFF_MAX__
-#  define YYPTRDIFF_T __PTRDIFF_TYPE__
-#  define YYPTRDIFF_MAXIMUM __PTRDIFF_MAX__
-# elif defined PTRDIFF_MAX
-#  ifndef ptrdiff_t
-#   include <stddef.h> /* INFRINGES ON USER NAME SPACE */
-#  endif
-#  define YYPTRDIFF_T ptrdiff_t
-#  define YYPTRDIFF_MAXIMUM PTRDIFF_MAX
-# else
-#  define YYPTRDIFF_T long
-#  define YYPTRDIFF_MAXIMUM LONG_MAX
-# endif
-#endif
-
-#ifndef YYSIZE_T
-# ifdef __SIZE_TYPE__
-#  define YYSIZE_T __SIZE_TYPE__
-# elif defined size_t
-#  define YYSIZE_T size_t
-# elif defined __STDC_VERSION__ && 199901 <= __STDC_VERSION__
-#  include <stddef.h> /* INFRINGES ON USER NAME SPACE */
-#  define YYSIZE_T size_t
-# else
-#  define YYSIZE_T unsigned
-# endif
-#endif
-
-#define YYSIZE_MAXIMUM                                  \
-  YY_CAST (YYPTRDIFF_T,                                 \
-           (YYPTRDIFF_MAXIMUM < YY_CAST (YYSIZE_T, -1)  \
-            ? YYPTRDIFF_MAXIMUM                         \
-            : YY_CAST (YYSIZE_T, -1)))
-
-#define YYSIZEOF(X) YY_CAST (YYPTRDIFF_T, sizeof (X))
-]])
-
 
 # b4_int_type_for(NAME)
 # ---------------------
-# Return a narrow int type able to handle numbers ranging from
+# Return the smallest int type able to handle numbers ranging from
 # 'NAME_min' to 'NAME_max' (included).
 m4_define([b4_int_type_for],
 [b4_int_type($1_min, $1_max)])
 
 
-# b4_table_value_equals(TABLE, VALUE, LITERAL, SYMBOL)
-# ----------------------------------------------------
+# b4_table_value_equals(TABLE, VALUE, LITERAL)
+# --------------------------------------------
 # Without inducing a comparison warning from the compiler, check if the
 # literal value LITERAL equals VALUE from table TABLE, which must have
-# TABLE_min and TABLE_max defined.  SYMBOL denotes
+# TABLE_min and TABLE_max defined.
 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) == $4)])])
+       [(!!(($2) == ($3)))])])
 
 
 ## ----------------- ##
@@ -338,47 +209,37 @@ m4_define([b4_table_value_equals],
 # Provide portable compiler "attributes".  If "noreturn" is passed, define
 # _Noreturn.
 m4_define([b4_attribute_define],
-[[#ifndef YY_ATTRIBUTE_PURE
-# if defined __GNUC__ && 2 < __GNUC__ + (96 <= __GNUC_MINOR__)
-#  define YY_ATTRIBUTE_PURE __attribute__ ((__pure__))
+[[#ifndef YY_ATTRIBUTE
+# if (defined __GNUC__                                               \
+      && (2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)))  \
+     || defined __SUNPRO_C && 0x5110 <= __SUNPRO_C
+#  define YY_ATTRIBUTE(Spec) __attribute__(Spec)
 # else
-#  define YY_ATTRIBUTE_PURE
+#  define YY_ATTRIBUTE(Spec) /* empty */
 # endif
 #endif
 
+#ifndef YY_ATTRIBUTE_PURE
+# define YY_ATTRIBUTE_PURE   YY_ATTRIBUTE ((__pure__))
+#endif
+
 #ifndef YY_ATTRIBUTE_UNUSED
-# if defined __GNUC__ && 2 < __GNUC__ + (7 <= __GNUC_MINOR__)
-#  define YY_ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-# else
-#  define YY_ATTRIBUTE_UNUSED
-# endif
+# define YY_ATTRIBUTE_UNUSED YY_ATTRIBUTE ((__unused__))
 #endif
 
 ]m4_bmatch([$1], [\bnoreturn\b], [[/* The _Noreturn keyword of C11.  */
-]dnl This is close to lib/_Noreturn.h, except that we do enable
-dnl the use of [[noreturn]], because _Noreturn is used in places
-dnl where [[noreturn]] works in C++.  We need this in particular
-dnl because of glr.cc which compiles code from glr.c in C++.
-dnl And the C++ compiler chokes on _Noreturn.  Also, we do not
-dnl use C' _Noreturn in C++, to avoid -Wc11-extensions warnings.
-[#ifndef _Noreturn
-# if (defined __cplusplus \
-      && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
-          || (defined _MSC_VER && 1900 <= _MSC_VER)))
+#if ! defined _Noreturn
+# if defined __cplusplus && 201103L <= __cplusplus
 #  define _Noreturn [[noreturn]]
-# elif (!defined __cplusplus                     \
-        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
-            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
-            || (defined __apple_build_version__ \
-                ? 6000000 <= __apple_build_version__ \
-                : 3 < __clang_major__ + (5 <= __clang_minor__))))
-   /* _Noreturn works as-is.  */
-# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
-#  define _Noreturn __attribute__ ((__noreturn__))
-# elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
-#  define _Noreturn __declspec (noreturn)
-# else
-#  define _Noreturn
+# elif !(defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__)
+#  if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
+       || 0x5110 <= __SUNPRO_C)
+#   define _Noreturn __attribute__ ((__noreturn__))
+#  elif defined _MSC_VER && 1200 <= _MSC_VER
+#   define _Noreturn __declspec (noreturn)
+#  else
+#   define _Noreturn
+#  endif
 # endif
 #endif
 
@@ -391,11 +252,11 @@ dnl use C' _Noreturn in C++, to avoid -Wc11-extensions warnings.
 
 #if defined __GNUC__ && ! defined __ICC && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
 /* Suppress an incorrect diagnostic about yylval being uninitialized.  */
-# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN                            \
-    _Pragma ("GCC diagnostic push")                                     \
-    _Pragma ("GCC diagnostic ignored \"-Wuninitialized\"")              \
+# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN \
+    _Pragma ("GCC diagnostic push") \
+    _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
@@ -407,36 +268,9 @@ dnl use C' _Noreturn in C++, to avoid -Wc11-extensions warnings.
 #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
@@ -482,22 +316,9 @@ static const b4_int_type_for([$2]) yy$1[[]] =
 ])
 
 
-## ------------- ##
-## Token kinds.  ##
-## ------------- ##
-
-# Because C enums are not scoped, because tokens are exposed in the
-# header, and because these tokens are common to all the parsers, we
-# need to make sure their names don't collide: use the api.prefix.
-# YYEOF is special, since the user may give it a different name.
-m4_define([b4_symbol(-2, id)],  [b4_api_PREFIX[][EMPTY]])
-m4_define([b4_symbol(-2, tag)], [[No symbol.]])
-
-m4_if(b4_symbol(0, id), [YYEOF],
-     [m4_define([b4_symbol(0, id)],  [b4_api_PREFIX[][EOF]])])
-m4_define([b4_symbol(1, id)],  [b4_api_PREFIX[][error]])
-m4_define([b4_symbol(2, id)],  [b4_api_PREFIX[][UNDEF]])
-
+## ------------------------- ##
+## Assigning token numbers.  ##
+## ------------------------- ##
 
 # b4_token_define(TOKEN-NUM)
 # --------------------------
@@ -509,7 +330,7 @@ m4_define([b4_token_define],
 # ----------------
 # Output the definition of the tokens.
 m4_define([b4_token_defines],
-[b4_any_token_visible_if([/* Token kinds.  */
+[b4_any_token_visible_if([/* Tokens.  */
 m4_join([
 ], b4_symbol_map([b4_token_define]))
 ])])
@@ -519,97 +340,48 @@ m4_join([
 # ------------------------
 # Output the definition of this token as an enum.
 m4_define([b4_token_enum],
-[b4_token_visible_if([$1],
-    [m4_format([    %-30s %s],
-               m4_format([[%s = %s%s%s]],
-                         b4_symbol([$1], [id]),
-                         b4_symbol([$1], b4_api_token_raw_if([[number]], [[code]])),
-                         m4_if([$1], b4_last_enum_token, [], [[,]])),
-               [b4_symbol_tag_comment([$1])])])])
+[b4_token_format([%s = %s], [$1])])
 
 
 # b4_token_enums
 # --------------
-# The definition of the token kinds.
+# Output the definition of the tokens (if there are) as enums.
 m4_define([b4_token_enums],
-[b4_any_token_visible_if([[/* Token kinds.  */
+[b4_any_token_visible_if([[/* Token type.  */
 #ifndef ]b4_api_PREFIX[TOKENTYPE
 # define ]b4_api_PREFIX[TOKENTYPE
   enum ]b4_api_prefix[tokentype
   {
-    ]b4_symbol([-2], [id])[ = -2,
-]b4_symbol_foreach([b4_token_enum])dnl
-[  };
-  typedef enum ]b4_api_prefix[tokentype ]b4_api_prefix[token_kind_t;
+    ]m4_join([,
+    ],
+             b4_symbol_map([b4_token_enum]))[
+  };
 #endif
 ]])])
 
 
 # b4_token_enums_defines
 # ----------------------
-# The definition of the tokens (if there are any) as enums and,
+# Output the definition of the tokens (if there are any) as enums and,
 # if POSIX Yacc is enabled, as #defines.
 m4_define([b4_token_enums_defines],
 [b4_token_enums[]b4_yacc_if([b4_token_defines])])
 
 
-# b4_symbol_translate(STRING)
-# ---------------------------
-# Used by "bison" in the array of symbol names to mark those that
-# require translation.
-m4_define([b4_symbol_translate],
-[[N_($1)]])
-
-
-
-## -------------- ##
-## Symbol kinds.  ##
-## -------------- ##
-
-# b4_symbol_enum(SYMBOL-NUM)
-# --------------------------
-# Output the definition of this symbol as an enum.
-m4_define([b4_symbol_enum],
-[m4_format([  %-40s %s],
-           m4_format([[%s = %s%s%s]],
-                     b4_symbol([$1], [kind_base]),
-                     [$1],
-                     m4_if([$1], b4_last_symbol, [], [[,]])),
-           [b4_symbol_tag_comment([$1])])])
-
-
-# b4_declare_symbol_enum
-# ----------------------
-# The definition of the symbol internal numbers as an enum.
-# Defining YYEMPTY here is important: it forces the compiler
-# to use a signed type, which matters for yytoken.
-m4_define([b4_declare_symbol_enum],
-[[/* Symbol kind.  */
-enum yysymbol_kind_t
-{
-  ]b4_symbol([-2], kind_base)[ = -2,
-]b4_symbol_foreach([b4_symbol_enum])dnl
-[};
-typedef enum yysymbol_kind_t yysymbol_kind_t;
-]])])
-
-
 ## ----------------- ##
 ## Semantic Values.  ##
 ## ----------------- ##
 
 
-# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
-# ----------------------------------------------
-# See README.
+# b4_symbol_value(VAL, [TYPE])
+# ----------------------------
+# Given a semantic value VAL ($$, $1 etc.), extract its value of type
+# 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],
-[m4_ifval([$3],
-          [($1.$3)],
-          [m4_ifval([$2],
-                    [b4_symbol_if([$2], [has_type],
-                                  [($1.b4_symbol([$2], [type]))],
-                                  [$1])],
-                    [$1])])])
+[($1[]m4_ifval([$2], [.$2]))])
+
 
 
 ## ---------------------- ##
@@ -617,6 +389,15 @@ m4_define([b4_symbol_value],
 ## ---------------------- ##
 
 
+# b4_function_define(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
+# -----------------------------------------------------------
+# Declare the function NAME in C.
+m4_define([b4_function_define],
+[$2
+$1 (b4_formals(m4_shift2($@)))[]dnl
+])
+
+
 # b4_formals([DECL1, NAME1], ...)
 # -------------------------------
 # The formal arguments of a C function definition.
@@ -630,6 +411,21 @@ m4_define([b4_formal],
 
 
 
+## ----------------------- ##
+## Declaring C functions.  ##
+## ----------------------- ##
+
+
+# b4_function_declare(NAME, RETURN-VALUE, [DECL1, NAME1], ...)
+# ------------------------------------------------------------
+# Declare the function NAME.
+m4_define([b4_function_declare],
+[$2 $1 (b4_formals(m4_shift2($@)));[]dnl
+])
+
+
+
+
 ## --------------------- ##
 ## Calling C functions.  ##
 ## --------------------- ##
@@ -666,12 +462,12 @@ m4_define([b4_sync_start], [[#]line $1 $2])
 ## User actions.  ##
 ## -------------- ##
 
-# b4_case(LABEL, STATEMENTS, [COMMENTS])
-# --------------------------------------
+# b4_case(LABEL, STATEMENTS)
+# --------------------------
 m4_define([b4_case],
-[  case $1:m4_ifval([$3], [ b4_comment([$3])])
+[  case $1:
 $2
-b4_syncline([@oline@], [@ofile@])dnl
+b4_syncline([@oline@], [@ofile@])
     break;])
 
 
@@ -681,7 +477,7 @@ m4_define([b4_predicate_case],
 [  case $1:
     if (! (
 $2)) YYERROR;
-b4_syncline([@oline@], [@ofile@])dnl
+b4_syncline([@oline@], [@ofile@])
     break;])
 
 
@@ -693,15 +489,18 @@ m4_define_default([b4_yydestruct_define],
 | Release the memory associated to this symbol.  |
 `-----------------------------------------------*/
 
-static void
-yydestruct (const char *yymsg,
-            yysymbol_kind_t yykind, YYSTYPE *yyvaluep]b4_locations_if(dnl
-[[, YYLTYPE *yylocationp]])[]b4_user_formals[)
+]b4_function_define([yydestruct],
+    [static void],
+    [[const char *yymsg],    [yymsg]],
+    [[int yytype],           [yytype]],
+    [[YYSTYPE *yyvaluep],    [yyvaluep]][]dnl
+b4_locations_if(            [, [[YYLTYPE *yylocationp], [yylocationp]]])[]dnl
+m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
 ]b4_parse_param_use([yyvaluep], [yylocationp])dnl
 [  if (!yymsg)
     yymsg = "Deleting";
-  YY_SYMBOL_PRINT (yymsg, yykind, yyvaluep, yylocationp);
+  YY_SYMBOL_PRINT (yymsg, yytype, yyvaluep, yylocationp);
 
   YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
   ]b4_symbol_actions([destructor])[
@@ -719,10 +518,13 @@ m4_define_default([b4_yy_symbol_print_define],
 | Print this symbol's value on YYO.  |
 `-----------------------------------*/
 
-static void
-yy_symbol_value_print (FILE *yyo,
-                       yysymbol_kind_t yykind, YYSTYPE const * const yyvaluep]b4_locations_if(dnl
-[[, YYLTYPE const * const yylocationp]])[]b4_user_formals[)
+]b4_function_define([yy_symbol_value_print],
+    [static void],
+               [[FILE *yyo],                            [yyo]],
+               [[int yytype],                           [yytype]],
+               [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
+b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
+m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   FILE *yyoutput = yyo;
 ]b4_parse_param_use([yyoutput], [yylocationp])dnl
@@ -731,34 +533,33 @@ yy_symbol_value_print (FILE *yyo,
 dnl glr.c does not feature yytoknum.
 m4_if(b4_skeleton, ["yacc.c"],
 [[# ifdef YYPRINT
-  if (yykind < YYNTOKENS)
-    YYPRINT (yyo, yytoknum[yykind], *yyvaluep);
+  if (yytype < YYNTOKENS)
+    YYPRINT (yyo, yytoknum[yytype], *yyvaluep);
 # endif
 ]])dnl
-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
-[}
+  b4_symbol_actions([printer])[
+}
 
 
 /*---------------------------.
 | Print this symbol on YYO.  |
 `---------------------------*/
 
-static void
-yy_symbol_print (FILE *yyo,
-                 yysymbol_kind_t yykind, YYSTYPE const * const yyvaluep]b4_locations_if(dnl
-[[, YYLTYPE const * const yylocationp]])[]b4_user_formals[)
+]b4_function_define([yy_symbol_print],
+    [static void],
+               [[FILE *yyo],                            [yyo]],
+               [[int yytype],                           [yytype]],
+               [[YYSTYPE const * const yyvaluep],       [yyvaluep]][]dnl
+b4_locations_if([, [[YYLTYPE const * const yylocationp], [yylocationp]]])[]dnl
+m4_ifset([b4_parse_param], [, b4_parse_param]))[
 {
   YYFPRINTF (yyo, "%s %s (",
-             yykind < YYNTOKENS ? "token" : "nterm", yysymbol_name (yykind));
+             yytype < YYNTOKENS ? "token" : "nterm", yytname[yytype]);
 
 ]b4_locations_if([  YY_LOCATION_PRINT (yyo, *yylocationp);
   YYFPRINTF (yyo, ": ");
 ])dnl
-[  yy_symbol_value_print (yyo, yykind, yyvaluep]dnl
+[  yy_symbol_value_print (yyo, yytype, yyvaluep]dnl
 b4_locations_if([, yylocationp])[]b4_user_args[);
   YYFPRINTF (yyo, ")");
 }]dnl
@@ -784,11 +585,11 @@ m4_define([b4_symbol_type_register],
 [m4_define([b4_symbol($1, type_tag)],
            [b4_symbol_if([$1], [has_id],
                          [b4_symbol([$1], [id])],
-                         [yykind_[]b4_symbol([$1], [number])])])dnl
+                         [yytype_[]b4_symbol([$1], [number])])])dnl
 m4_append([b4_union_members],
-m4_expand([m4_format([  %-40s %s],
-                     m4_expand([b4_symbol([$1], [type]) b4_symbol([$1], [type_tag]);]),
-                     [b4_symbol_tag_comment([$1])])]))
+m4_expand([
+  b4_symbol_tag_comment([$1])dnl
+  b4_symbol([$1], [type]) b4_symbol([$1], [type_tag]);]))
 ])
 
 
@@ -803,17 +604,14 @@ m4_define([b4_type_define_tag],
 ])
 
 
-# b4_symbol_value_union(VAL, SYMBOL-NUM, [TYPE])
-# ----------------------------------------------
+# b4_symbol_value_union(VAL, [TYPE])
+# ----------------------------------
 # Same of b4_symbol_value, but when api.value.type=union.
 m4_define([b4_symbol_value_union],
-[m4_ifval([$3],
-          [(*($3*)(&$1))],
-          [m4_ifval([$2],
-                    [b4_symbol_if([$2], [has_type],
-                                  [($1.b4_symbol([$2], [type_tag]))],
-                                  [$1])],
-                    [$1])])])
+[m4_ifval([$2],
+          [(*($2*)(&$1))],
+          [$1])])
+])
 
 
 # b4_value_type_setup_union
@@ -905,13 +703,13 @@ 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]])dnl
-[union ]b4_percent_define_get([[api.value.union.name]])[
+]b4_percent_define_get_syncline([[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]])dnl
-[typedef union ]b4_percent_define_get([[api.value.union.name]])[ ]b4_api_PREFIX[STYPE;
+]b4_percent_define_get_syncline([[api.value.union.name]])[
+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
@@ -922,10 +720,7 @@ typedef ]b4_percent_define_get([[api.value.type]])[ ]b4_api_PREFIX[STYPE;
 # -----------------------
 m4_define([b4_location_type_define],
 [[/* Location type.  */
-]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
+#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
 {
@@ -937,7 +732,7 @@ 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
@@ -1021,14 +816,16 @@ m4_define([b4_yy_location_print_define],
    This macro was not mandated originally: define only if we know
    we won't break user code: when these are the locations we know.  */
 
-# ifndef YY_LOCATION_PRINT
-#  if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+#ifndef YY_LOCATION_PRINT
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
 
 /* Print *YYLOCP on YYO.  Private, do not rely on its existence. */
 
 YY_ATTRIBUTE_UNUSED
-static int
-yy_location_print_ (FILE *yyo, YYLTYPE const * const yylocp)
+]b4_function_define([yy_location_print_],
+    [static int],
+               [[FILE *yyo],                    [yyo]],
+               [[YYLTYPE const * const yylocp], [yylocp]])[
 {
   int res = 0;
   int end_col = 0 != yylocp->last_column ? yylocp->last_column - 1 : 0;
@@ -1052,17 +849,17 @@ yy_location_print_ (FILE *yyo, YYLTYPE const * const yylocp)
   return res;
  }
 
-#   define YY_LOCATION_PRINT(File, Loc)          \
+#  define YY_LOCATION_PRINT(File, Loc)          \
   yy_location_print_ (File, &(Loc))
 
-#  else
-#   define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-#  endif
-# endif /* !defined YY_LOCATION_PRINT */]],
-[[/* This macro is provided for backward compatibility. */
-# ifndef YY_LOCATION_PRINT
+# else
 #  define YY_LOCATION_PRINT(File, Loc) ((void) 0)
-# endif]])
+# endif
+#endif]],
+[[/* This macro is provided for backward compatibility. */
+#ifndef YY_LOCATION_PRINT
+# define YY_LOCATION_PRINT(File, Loc) ((void) 0)
+#endif]])
 ])
 
 # b4_yyloc_default

data/glr.cc

@@ -1,6 +1,6 @@
 # C++ GLR skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# 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
@@ -46,11 +46,11 @@
 # We require a pure interface.
 m4_define([b4_pure_flag], [1])
 
-m4_include(b4_skeletonsdir/[c++.m4])
-b4_bison_locations_if([m4_include(b4_skeletonsdir/[location.cc])])
+m4_include(b4_pkgdatadir/[c++.m4])
+b4_bison_locations_if([m4_include(b4_pkgdatadir/[location.cc])])
 
-m4_define([b4_parser_class],
-          [b4_percent_define_get([[api.parser.class]])])
+m4_define([b4_parser_class_name],
+          [b4_percent_define_get([[parser_class_name]])])
 
 # Save the parse parameters.
 m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
@@ -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[& yyparser], [[yyparser]]],]
+           [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]],]
 m4_defn([b4_parse_param]))],
 [m4_define([b4_parse_param_wrap],
-           [[b4_namespace_ref::b4_parser_class[& yyparser], [[yyparser]]]])
+           [[b4_namespace_ref::b4_parser_class_name[& yyparser], [[yyparser]]]])
 ])
 
 
@@ -72,17 +72,24 @@ m4_defn([b4_parse_param]))],
 # Bypass the default implementation to generate the "yy_symbol_print"
 # and "yy_symbol_value_print" functions.
 m4_define([b4_yy_symbol_print_define],
-[[/*--------------------.
+[[
+/*--------------------.
 | Print this symbol.  |
 `--------------------*/
 
-static void
-yy_symbol_print (FILE *, ]b4_namespace_ref::b4_parser_class[::symbol_kind_type yytoken,
-                 const ]b4_namespace_ref::b4_parser_class[::semantic_type *yyvaluep]b4_locations_if([[,
-                 const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp]])[]b4_user_formals[)
+]b4_function_define([yy_symbol_print],
+    [static void],
+    [[FILE *],      []],
+    [[int yytype],  [yytype]],
+    [[const ]b4_namespace_ref::b4_parser_class_name[::semantic_type *yyvaluep],
+                    [yyvaluep]][]dnl
+b4_locations_if([,
+    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+                    [yylocationp]]]),
+    b4_parse_param)[
 {
 ]b4_parse_param_use[]dnl
-[  yyparser.yy_symbol_print_ (yytoken, yyvaluep]b4_locations_if([, yylocationp])[);
+[  yyparser.yy_symbol_print_ (yytype, yyvaluep]b4_locations_if([, yylocationp])[);
 }
 ]])[
 
@@ -91,27 +98,52 @@ yy_symbol_print (FILE *, ]b4_namespace_ref::b4_parser_class[::symbol_kind_type y
 [yylloc.initialize ();]m4_ifdef([b4_initial_action], [
 m4_defn([b4_initial_action])]))])[
 
-# Hijack the post prologue to declare yyerror.
+# Hijack the post prologue to insert early definition of YYLLOC_DEFAULT
+# and declaration of yyerror.
 ]m4_append([b4_post_prologue],
-[b4_syncline([@oline@], [@ofile@])dnl
-[static void
-yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp,
-         ]])[]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param),
-         ])[const char* msg);]])[
+[b4_syncline([@oline@], [@ofile@])[
+]b4_yylloc_default_define[
+#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],
+                        [yylocationp]],])
+    b4_parse_param,
+    [[const char* msg], [msg]])])
 
-# Inserted before the epilogue to define implementations (yyerror, parser member
+
+#undef yynerrs
+#undef yychar
+#undef yylval]b4_locations_if([
+#undef yylloc])
+
+m4_if(b4_prefix, [yy], [],
+[[/* Substitute the variable and function names.  */
+#define yyparse ]b4_prefix[parse
+#define yylex   ]b4_prefix[lex
+#define yyerror ]b4_prefix[error
+#define yydebug ]b4_prefix[debug
+]]b4_pure_if([], [[
+#define yylval  ]b4_prefix[lval
+#define yychar  ]b4_prefix[char
+#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc  ]b4_prefix[lloc]])]))
+
+# Hijack the epilogue to define implementations (yyerror, parser member
 # functions etc.).
-]m4_define([b4_glr_cc_pre_epilogue],
-[b4_syncline([@oline@], [@ofile@])dnl
-[
+m4_append([b4_epilogue],
+[b4_syncline([@oline@], [@ofile@])[
+
 /*------------------.
 | Report an error.  |
 `------------------*/
 
-static void
-yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp,
-         ]])[]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param),
-         ])[const char* msg)
+]b4_function_define([yyerror],
+    [static void],b4_locations_if([
+    [[const ]b4_namespace_ref::b4_parser_class_name[::location_type *yylocationp],
+                        [yylocationp]],])
+    b4_parse_param,
+    [[const char* msg], [msg]])[
 {
 ]b4_parse_param_use[]dnl
 [  yyparser.error (]b4_locations_if([[*yylocationp, ]])[msg);
@@ -122,27 +154,26 @@ yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_
 ]dnl In this section, the parse params are the original parse_params.
 m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 [  /// Build a parser object.
-  ]b4_parser_class::b4_parser_class[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
+  ]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
     :])[
 #if ]b4_api_PREFIX[DEBUG
     ]m4_ifset([b4_parse_param], [  ], [ :])[yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
 #endif]b4_parse_param_cons[
-  {}
+  {
+  }
 
-  ]b4_parser_class::~b4_parser_class[ ()
-  {}
-
-  ]b4_parser_class[::syntax_error::~syntax_error () YY_NOEXCEPT YY_NOTHROW
-  {}
+  ]b4_parser_class_name::~b4_parser_class_name[ ()
+  {
+  }
 
   int
-  ]b4_parser_class[::operator() ()
+  ]b4_parser_class_name[::operator() ()
   {
     return parse ();
   }
 
   int
-  ]b4_parser_class[::parse ()
+  ]b4_parser_class_name[::parse ()
   {
     return ::yyparse (*this]b4_user_args[);
   }
@@ -153,9 +184,9 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
   `--------------------*/
 
   void
-  ]b4_parser_class[::yy_symbol_value_print_ (symbol_kind_type yykind,
+  ]b4_parser_class_name[::yy_symbol_value_print_ (int yytype,
                            const semantic_type* yyvaluep]b4_locations_if([[,
-                           const location_type* yylocationp]])[) const
+                           const location_type* yylocationp]])[)
   {]b4_locations_if([[
     YYUSE (yylocationp);]])[
     YYUSE (yyvaluep);
@@ -167,38 +198,38 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 
 
   void
-  ]b4_parser_class[::yy_symbol_print_ (symbol_kind_type yykind,
+  ]b4_parser_class_name[::yy_symbol_print_ (int yytype,
                            const semantic_type* yyvaluep]b4_locations_if([[,
-                           const location_type* yylocationp]])[) const
+                           const location_type* yylocationp]])[)
   {
-    *yycdebug_ << (yykind < YYNTOKENS ? "token" : "nterm")
-               << ' ' << yytname[yykind] << " ("]b4_locations_if([[
+    *yycdebug_ << (yytype < YYNTOKENS ? "token" : "nterm")
+               << ' ' << yytname[yytype] << " ("]b4_locations_if([[
                << *yylocationp << ": "]])[;
-    yy_symbol_value_print_ (yykind, yyvaluep]b4_locations_if([[, yylocationp]])[);
+    yy_symbol_value_print_ (yytype, yyvaluep]b4_locations_if([[, yylocationp]])[);
     *yycdebug_ << ')';
   }
 
   std::ostream&
-  ]b4_parser_class[::debug_stream () const
+  ]b4_parser_class_name[::debug_stream () const
   {
     return *yycdebug_;
   }
 
   void
-  ]b4_parser_class[::set_debug_stream (std::ostream& o)
+  ]b4_parser_class_name[::set_debug_stream (std::ostream& o)
   {
     yycdebug_ = &o;
   }
 
 
-  ]b4_parser_class[::debug_level_type
-  ]b4_parser_class[::debug_level () const
+  ]b4_parser_class_name[::debug_level_type
+  ]b4_parser_class_name[::debug_level () const
   {
     return yydebug;
   }
 
   void
-  ]b4_parser_class[::set_debug_level (debug_level_type l)
+  ]b4_parser_class_name[::set_debug_level (debug_level_type l)
   {
     // Actually, it is yydebug which is really used.
     yydebug = l;
@@ -206,58 +237,7 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
 
 #endif
 ]m4_popdef([b4_parse_param])dnl
-b4_namespace_close[]dnl
-])
-
-
-m4_define([b4_define_symbol_kind],
-[m4_format([#define %-15s %s],
-           b4_symbol($][1, kind_base),
-           b4_namespace_ref[::]b4_parser_class[::symbol_kind::]b4_symbol($1, kind_base))
-])
-
-# b4_glr_cc_setup
-# ---------------
-# Setup redirections for glr.c: Map the names used in c.m4 to the ones used
-# in c++.m4.
-m4_define([b4_glr_cc_setup],
-[[#undef ]b4_symbol(-2, [id])[
-#define ]b4_symbol(-2, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(-2, [id])[
-#undef ]b4_symbol(0, [id])[
-#define ]b4_symbol(0, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(0, [id])[
-#undef ]b4_symbol(1, [id])[
-#define ]b4_symbol(1, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(1, [id])[
-
-#ifndef ]b4_api_PREFIX[STYPE
-# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class[::semantic_type
-#endif
-#ifndef ]b4_api_PREFIX[LTYPE
-# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class[::location_type
-#endif
-
-typedef ]b4_namespace_ref[::]b4_parser_class[::symbol_kind_type yysymbol_kind_t;
-
-// Expose C++ symbol kinds to C.
-]b4_define_symbol_kind(-2)dnl
-b4_symbol_foreach([b4_define_symbol_kind])])[
-]])
-
-
-m4_define([b4_undef_symbol_kind],
-[[#undef ]b4_symbol($1, kind_base)[
-]])
-
-
-# b4_glr_cc_cleanup
-# -----------------
-# Remove redirections for glr.c.
-m4_define([b4_glr_cc_cleanup],
-[[#undef ]b4_symbol(-2, [id])[
-#undef ]b4_symbol(0, [id])[
-#undef ]b4_symbol(1, [id])[
-
-]b4_undef_symbol_kind(-2)dnl
-b4_symbol_foreach([b4_undef_symbol_kind])dnl
+b4_namespace_close
 ])
 
 
@@ -272,54 +252,26 @@ b4_percent_code_get([[requires]])[
 #include <stdexcept>
 #include <string>
 
-]b4_cxx_portability[
-]m4_ifdef([b4_location_include],
+]m4_ifdef([b4_location_file],
           [[# 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[
+  class ]b4_parser_class_name[
   {
   public:
 ]b4_public_types_declare[
 
     /// Build a parser object.
-    ]b4_parser_class[ (]b4_parse_param_decl[);
-    virtual ~]b4_parser_class[ ();
+    ]b4_parser_class_name[ (]b4_parse_param_decl[);
+    virtual ~]b4_parser_class_name[ ();
 
     /// Parse.  An alias for parse ().
     /// \returns  0 iff parsing succeeded.
@@ -329,7 +281,6 @@ 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.
@@ -341,8 +292,8 @@ 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.
@@ -351,47 +302,57 @@ b4_percent_code_get([[requires]])[
 # if ]b4_api_PREFIX[DEBUG
   public:
     /// \brief Report a symbol value on the debug stream.
-    /// \param yykind       The symbol kind.
+    /// \param yytype       The token type.
     /// \param yyvaluep     Its semantic value.]b4_locations_if([[
     /// \param yylocationp  Its location.]])[
-    virtual void yy_symbol_value_print_ (symbol_kind_type yykind,
+    virtual void yy_symbol_value_print_ (int yytype,
                                          const semantic_type* yyvaluep]b4_locations_if([[,
-                                         const location_type* yylocationp]])[) const;
+                                         const location_type* yylocationp]])[);
     /// \brief Report a symbol on the debug stream.
-    /// \param yykind       The symbol kind.
+    /// \param yytype       The token type.
     /// \param yyvaluep     Its semantic value.]b4_locations_if([[
     /// \param yylocationp  Its location.]])[
-    virtual void yy_symbol_print_ (symbol_kind_type yykind,
+    virtual void yy_symbol_print_ (int yytype,
                                    const semantic_type* yyvaluep]b4_locations_if([[,
-                                   const location_type* yylocationp]])[) const;
+                                   const location_type* yylocationp]])[);
   private:
-    /// Debug stream.
+    // Debugging.
     std::ostream* yycdebug_;
 #endif
 
 ]b4_parse_param_vars[
   };
 
-]b4_namespace_close[
+]dnl Redirections for glr.c.
+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
+#endif
+#ifndef ]b4_api_PREFIX[LTYPE
+# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class_name[::location_type
+#endif
 
+]b4_namespace_close[
 ]b4_percent_code_get([[provides]])[
 ]m4_popdef([b4_parse_param])dnl
-])[
+])
 
-]b4_defines_if(
-[b4_output_begin([b4_spec_header_file])
+b4_defines_if(
+[b4_output_begin([b4_spec_defines_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018])[
 // C++ GLR parser skeleton written by Akim Demaille.
 
 ]b4_disclaimer[
-]b4_cpp_guard_open([b4_spec_mapped_header_file])[
+]b4_cpp_guard_open([b4_spec_defines_file])[
 ]b4_shared_declarations[
-]b4_cpp_guard_close([b4_spec_mapped_header_file])[
+]b4_cpp_guard_close([b4_spec_defines_file])[
 ]b4_output_end])
 
 # Let glr.c (and b4_shared_declarations) believe that the user
 # arguments include the parser itself.
 m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_wrap]))
-m4_include(b4_skeletonsdir/[glr.c])
+m4_include(b4_pkgdatadir/[glr.c])
 m4_popdef([b4_parse_param])

data/java-skel.m4

@@ -2,8 +2,7 @@
 
 # Java skeleton dispatching for Bison.
 
-# Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
-# Inc.
+# Copyright (C) 2007, 2009-2015, 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
@@ -21,7 +20,7 @@
 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_skeletonsdir/[lalr1.java]])
+m4_define_default([b4_used_skeleton], [b4_pkgdatadir/[lalr1.java]])
 m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
 
 m4_include(b4_used_skeleton)

data/java.m4

@@ -2,7 +2,7 @@
 
 # Java language support for Bison
 
-# Copyright (C) 2007-2015, 2018-2020 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
@@ -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_skeletonsdir/[c-like.m4])
+m4_include(b4_pkgdatadir/[c-like.m4])
 
 
 # b4_list2(LIST1, LIST2)
@@ -42,24 +42,32 @@ m4_define([b4_percent_define_get3],
 m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
 
 
-# b4_parser_class_declaration
-# ---------------------------
-# The declaration of the parser class ("class YYParser"), with all its
-# qualifiers/annotations.
-b4_percent_define_default([[api.parser.abstract]], [[false]])
-b4_percent_define_default([[api.parser.final]],    [[false]])
-b4_percent_define_default([[api.parser.public]],   [[false]])
-b4_percent_define_default([[api.parser.strictfp]], [[false]])
+# b4_public_if(TRUE, FALSE)
+# -------------------------
+b4_percent_define_default([[public]], [[false]])
+m4_define([b4_public_if],
+[b4_percent_define_flag_if([public], [$1], [$2])])
 
-m4_define([b4_parser_class_declaration],
-[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
-b4_percent_define_flag_if([api.parser.public],   [public ])dnl
-b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
-b4_percent_define_flag_if([api.parser.final],    [final ])dnl
-b4_percent_define_flag_if([api.parser.strictfp], [strictfp ])dnl
-[class ]b4_parser_class[]dnl
-b4_percent_define_get3([api.parser.extends], [ extends ])dnl
-b4_percent_define_get3([api.parser.implements], [ implements ])])
+
+# b4_abstract_if(TRUE, FALSE)
+# ---------------------------
+b4_percent_define_default([[abstract]], [[false]])
+m4_define([b4_abstract_if],
+[b4_percent_define_flag_if([abstract], [$1], [$2])])
+
+
+# b4_final_if(TRUE, FALSE)
+# ---------------------------
+b4_percent_define_default([[final]], [[false]])
+m4_define([b4_final_if],
+[b4_percent_define_flag_if([final], [$1], [$2])])
+
+
+# b4_strictfp_if(TRUE, FALSE)
+# ---------------------------
+b4_percent_define_default([[strictfp]], [[false]])
+m4_define([b4_strictfp_if],
+[b4_percent_define_flag_if([strictfp], [$1], [$2])])
 
 
 # b4_lexer_if(TRUE, FALSE)
@@ -106,13 +114,10 @@ m4_define([b4_null], [null])
 
 # b4_typed_parser_table_define(TYPE, NAME, DATA, COMMENT)
 # -------------------------------------------------------
-# We use intermediate functions (e.g., yypact_init) to work around the
-# 64KB limit for JVM methods.  See
-# https://lists.gnu.org/r/help-bison/2008-11/msg00004.html.
 m4_define([b4_typed_parser_table_define],
 [m4_ifval([$4], [b4_comment([$4])
   ])dnl
-[private static final ]$1[[] yy$2_ = yy$2_init();
+[private static final ]$1[ yy$2_[] = yy$2_init();
   private static final ]$1[[] yy$2_init()
   {
     return new ]$1[[]
@@ -128,158 +133,40 @@ m4_define([b4_integral_parser_table_define],
 [b4_typed_parser_table_define([b4_int_type_for([$2])], [$1], [$2], [$3])])
 
 
-## ------------- ##
-## Token kinds.  ##
-## ------------- ##
-
+## ------------------------- ##
+## Assigning token numbers.  ##
+## ------------------------- ##
 
 # b4_token_enum(TOKEN-NUM)
 # ------------------------
 # Output the definition of this token as an enum.
 m4_define([b4_token_enum],
-[b4_token_visible_if([$1],
-    [m4_format([[    /** Token %s, to be returned by the scanner.  */
-    static final int %s = %s%s;
-]],
-               b4_symbol([$1], [tag]),
-               b4_symbol([$1], [id]),
-               b4_symbol([$1], b4_api_token_raw_if([[number]], [[code]])))])])
-
+[b4_token_format([    /** Token number, to be returned by the scanner.  */
+    static final int %s = %s;
+], [$1])])
 
 # b4_token_enums
 # --------------
 # Output the definition of the tokens (if there are) as enums.
 m4_define([b4_token_enums],
-[b4_any_token_visible_if([    /* Token kinds.  */
+[b4_any_token_visible_if([/* Tokens.  */
 b4_symbol_foreach([b4_token_enum])])])
 
-
-
-## -------------- ##
-## Symbol kinds.  ##
-## -------------- ##
-
-
-# b4_symbol_kind(NUM)
-# -------------------
-m4_define([b4_symbol_kind],
-[SymbolKind.b4_symbol_kind_base($@)])
-
-
-# b4_symbol_enum(SYMBOL-NUM)
-# --------------------------
-# Output the definition of this symbol as an enum.
-m4_define([b4_symbol_enum],
-[m4_format([    %-30s %s],
-           m4_format([[%s(%s)%s]],
-                     b4_symbol([$1], [kind_base]),
-                     [$1],
-                     m4_if([$1], b4_last_symbol, [[;]], [[,]])),
-           [b4_symbol_tag_comment([$1])])])
-
-
-# b4_declare_symbol_enum
-# ----------------------
-# The definition of the symbol internal numbers as an enum.
-m4_define([b4_declare_symbol_enum],
-[[  public enum SymbolKind
-  {
-]b4_symbol_foreach([b4_symbol_enum])[
-
-    private final int yycode_;
-
-    SymbolKind (int n) {
-      this.yycode_ = n;
-    }
-
-    private static final SymbolKind[] values_ = {
-      ]m4_map_args_sep([b4_symbol_kind(], [)], [,
-      ], b4_symbol_numbers)[
-    };
-
-    static final SymbolKind get(int code) {
-      return values_[code];
-    }
-
-    public final int getCode() {
-      return this.yycode_;
-    }
-
-]b4_parse_error_bmatch(
-[simple\|verbose],
-[[    /* Return YYSTR after stripping away unnecessary quotes and
-       backslashes, so that it's suitable for yyerror.  The heuristic is
-       that double-quoting is unnecessary unless the string contains an
-       apostrophe, a comma, or backslash (other than backslash-backslash).
-       YYSTR is taken from yytname.  */
-    private static String yytnamerr_(String yystr)
-    {
-      if (yystr.charAt (0) == '"')
-        {
-          StringBuffer yyr = new StringBuffer();
-          strip_quotes: for (int i = 1; i < yystr.length(); i++)
-            switch (yystr.charAt(i))
-              {
-              case '\'':
-              case ',':
-                break strip_quotes;
-
-              case '\\':
-                if (yystr.charAt(++i) != '\\')
-                  break strip_quotes;
-                /* Fall through.  */
-              default:
-                yyr.append(yystr.charAt(i));
-                break;
-
-              case '"':
-                return yyr.toString();
-              }
-        }
-      return yystr;
-    }
-
-    /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
-       First, the terminals, then, starting at \a YYNTOKENS_, nonterminals.  */
-    ]b4_typed_parser_table_define([String], [tname], [b4_tname])[
-
-    /* The user-facing name of this symbol.  */
-    public final String getName() {
-      return yytnamerr_(yytname_[yycode_]);
-    }
-]],
-[custom\|detailed],
-[[    /* YYNAMES_[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
-       First, the terminals, then, starting at \a YYNTOKENS_, nonterminals.  */
-    ]b4_typed_parser_table_define([String], [names], [b4_symbol_names])[
-
-    /* The user-facing name of this symbol.  */
-    public final String getName() {
-      return yynames_[yycode_];
-    }]])[
-  };
-]])])
-
-
-
-# b4_case(ID, CODE, [COMMENTS])
-# -----------------------------
+# b4-case(ID, CODE)
+# -----------------
 # We need to fool Java's stupid unreachable code detection.
-m4_define([b4_case],
-[  case $1:m4_ifval([$3], [ b4_comment([$3])])
+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;
-])
+    ])
 
 
 ## -------- ##
@@ -293,7 +180,7 @@ 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([[api.parser.class]],  [code], [deprecated])
+b4_percent_define_check_kind([[parser_class_name]], [code], [deprecated])
 b4_percent_define_check_kind([[throws]],            [code], [deprecated])
 
 
@@ -304,24 +191,12 @@ 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]])
-b4_percent_define_default([[api.symbol.prefix]], [[S_]])
 
-# b4_api_prefix, b4_api_PREFIX
-# ----------------------------
-# Corresponds to %define api.prefix
-b4_percent_define_default([[api.prefix]], [[YY]])
-m4_define([b4_api_prefix],
-[b4_percent_define_get([[api.prefix]])])
-m4_define([b4_api_PREFIX],
-[m4_toupper(b4_api_prefix)])
+# %name-prefix
+m4_define_default([b4_prefix], [[YY]])
 
-# b4_prefix
-# ---------
-# If the %name-prefix is not given, it is api.prefix.
-m4_define_default([b4_prefix], [b4_api_prefix])
-
-b4_percent_define_default([[api.parser.class]], [b4_prefix[]Parser])
-m4_define([b4_parser_class], [b4_percent_define_get([[api.parser.class]])])
+b4_percent_define_default([[parser_class_name]], [b4_prefix[]Parser])
+m4_define([b4_parser_class_name], [b4_percent_define_get([[parser_class_name]])])
 
 b4_percent_define_default([[lex_throws]], [[java.io.IOException]])
 m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])
@@ -344,56 +219,21 @@ m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])
 ## ----------------- ##
 
 
-# b4_symbol_translate(STRING)
-# ---------------------------
-# Used by "bison" in the array of symbol names to mark those that
-# require translation.
-m4_define([b4_symbol_translate],
-[[i18n($1)]])
-
-
-# b4_trans(STRING)
-# ----------------
-# Translate a string if i18n is enabled.  Avoid collision with b4_translate.
-m4_define([b4_trans],
-[b4_has_translations_if([i18n($1)], [$1])])
-
-
-
-# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
-# ----------------------------------------------
-# See README.
-m4_define([b4_symbol_value],
-[m4_ifval([$3],
-          [(($3)($1))],
-          [m4_ifval([$2],
-                    [b4_symbol_if([$2], [has_type],
-                                  [((b4_symbol([$2], [type]))($1))],
-                                  [$1])],
-                    [$1])])])
-
-
-# b4_lhs_value([SYMBOL-NUM], [TYPE])
-# ----------------------------------
-# See README.
+# b4_lhs_value([TYPE])
+# --------------------
+# Expansion of $<TYPE>$.
 m4_define([b4_lhs_value], [yyval])
 
 
-# b4_rhs_data(RULE-LENGTH, POS)
-# -----------------------------
-# See README.
-m4_define([b4_rhs_data],
-[yystack.valueAt (b4_subtract($@))])
-
-# b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])
-# --------------------------------------------------
-# See README.
+# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
+# --------------------------------------
+# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
+# symbols on RHS.
 #
 # In this simple implementation, %token and %type have class names
 # between the angle brackets.
 m4_define([b4_rhs_value],
-[b4_symbol_value([b4_rhs_data([$1], [$2])], [$3], [$4])])
-
+[(m4_ifval($3, [($3)])[](yystack.valueAt ($1-($2))))])
 
 # b4_lhs_location()
 # -----------------
@@ -402,12 +242,12 @@ m4_define([b4_lhs_location],
 [(yyloc)])
 
 
-# b4_rhs_location(RULE-LENGTH, POS)
+# b4_rhs_location(RULE-LENGTH, NUM)
 # ---------------------------------
-# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
 # on RHS.
 m4_define([b4_rhs_location],
-[yystack.locationAt (b4_subtract($@))])
+[yystack.locationAt ($1-($2))])
 
 
 # b4_lex_param
@@ -499,4 +339,4 @@ 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/local.mk

@@ -1,5 +1,4 @@
-## Copyright (C) 2002, 2005-2015, 2018-2020 Free Software Foundation,
-## Inc.
+## Copyright (C) 2002, 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
@@ -15,35 +14,23 @@
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 dist_pkgdata_DATA =                             \
-  data/README.md                                \
-  data/bison-default.css
-
-skeletonsdir = $(pkgdatadir)/skeletons
-dist_skeletons_DATA =                           \
-  data/skeletons/bison.m4                       \
-  data/skeletons/c++-skel.m4                    \
-  data/skeletons/c++.m4                         \
-  data/skeletons/c-like.m4                      \
-  data/skeletons/c-skel.m4                      \
-  data/skeletons/c.m4                           \
-  data/skeletons/glr.c                          \
-  data/skeletons/glr.cc                         \
-  data/skeletons/java-skel.m4                   \
-  data/skeletons/java.m4                        \
-  data/skeletons/lalr1.cc                       \
-  data/skeletons/lalr1.java                     \
-  data/skeletons/location.cc                    \
-  data/skeletons/stack.hh                       \
-  data/skeletons/traceon.m4                     \
-  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
+  data/README                                   \
+  data/bison.m4                                 \
+  data/c++-skel.m4                              \
+  data/c++.m4                                   \
+  data/c-like.m4                                \
+  data/c-skel.m4                                \
+  data/c.m4                                     \
+  data/glr.c                                    \
+  data/glr.cc                                   \
+  data/java-skel.m4                             \
+  data/java.m4                                  \
+  data/lalr1.cc                                 \
+  data/lalr1.java                               \
+  data/location.cc                              \
+  data/stack.hh                                 \
+  data/variant.hh                               \
+  data/yacc.c
 
 m4sugardir = $(pkgdatadir)/m4sugar
 dist_m4sugar_DATA =                             \

data/location.cc

@@ -1,6 +1,6 @@
 # C++ skeleton for Bison
 
-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# 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
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 m4_pushdef([b4_copyright_years],
-           [2002-2015, 2018-2020])
+           [2002-2015, 2018])
 
 
 # b4_position_file
@@ -48,7 +48,7 @@ m4_ifdef([b4_location_file],
                                   ["b4_location_file"])])
  m4_define([b4_location_path],
            b4_percent_define_get([[api.location.include]],
-                                 ["b4_mapped_dir_prefix[]b4_location_file"]))
+                                 ["b4_dir_prefix[]b4_location_file"]))
  m4_define([b4_location_path],
            m4_substr(m4_defn([b4_location_path]), 1, m4_eval(m4_len(m4_defn([b4_location_path])) - 2)))
  ])
@@ -62,16 +62,11 @@ m4_define([b4_location_define],
 [[  /// A point in a source file.
   class position
   {
-  public:
-    /// Type for file name.
-    typedef ]b4_percent_define_get([[api.filename.type]])[ filename_type;
-    /// Type for line and column numbers.
-    typedef int counter_type;
-]m4_ifdef([b4_location_constructors], [[
+  public:]m4_ifdef([b4_location_constructors], [[
     /// Construct a position.
-    explicit position (filename_type* f = YY_NULLPTR,
-                       counter_type l = ]b4_location_initial_line[,
-                       counter_type c = ]b4_location_initial_column[)
+    explicit position (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
+                       unsigned l = ]b4_location_initial_line[u,
+                       unsigned c = ]b4_location_initial_column[u)
       : filename (f)
       , line (l)
       , column (c)
@@ -79,9 +74,9 @@ m4_define([b4_location_define],
 
 ]])[
     /// Initialization.
-    void initialize (filename_type* fn = YY_NULLPTR,
-                     counter_type l = ]b4_location_initial_line[,
-                     counter_type c = ]b4_location_initial_column[)
+    void initialize (]b4_percent_define_get([[filename_type]])[* fn = YY_NULLPTR,
+                     unsigned l = ]b4_location_initial_line[u,
+                     unsigned c = ]b4_location_initial_column[u)
     {
       filename = fn;
       line = l;
@@ -91,40 +86,41 @@ m4_define([b4_location_define],
     /** \name Line and Column related manipulators
      ** \{ */
     /// (line related) Advance to the COUNT next lines.
-    void lines (counter_type count = 1)
+    void lines (int count = 1)
     {
       if (count)
         {
-          column = ]b4_location_initial_column[;
+          column = ]b4_location_initial_column[u;
           line = add_ (line, count, ]b4_location_initial_line[);
         }
     }
 
     /// (column related) Advance to the COUNT next columns.
-    void columns (counter_type count = 1)
+    void columns (int count = 1)
     {
       column = add_ (column, count, ]b4_location_initial_column[);
     }
     /** \} */
 
     /// File name to which this position refers.
-    filename_type* filename;
+    ]b4_percent_define_get([[filename_type]])[* filename;
     /// Current line number.
-    counter_type line;
+    unsigned line;
     /// Current column number.
-    counter_type column;
+    unsigned column;
 
   private:
     /// Compute max (min, lhs+rhs).
-    static counter_type add_ (counter_type lhs, counter_type rhs, counter_type min)
+    static unsigned add_ (unsigned lhs, int rhs, int min)
     {
-      return lhs + rhs < min ? min : lhs + rhs;
+      return static_cast<unsigned> (std::max (min,
+                                              static_cast<int> (lhs) + rhs));
     }
   };
 
   /// Add \a width columns, in place.
   inline position&
-  operator+= (position& res, position::counter_type width)
+  operator+= (position& res, int width)
   {
     res.columns (width);
     return res;
@@ -132,21 +128,21 @@ m4_define([b4_location_define],
 
   /// Add \a width columns.
   inline position
-  operator+ (position res, position::counter_type width)
+  operator+ (position res, int width)
   {
     return res += width;
   }
 
   /// Subtract \a width columns, in place.
   inline position&
-  operator-= (position& res, position::counter_type width)
+  operator-= (position& res, int width)
   {
     return res += -width;
   }
 
   /// Subtract \a width columns.
   inline position
-  operator- (position res, position::counter_type width)
+  operator- (position res, int width)
   {
     return res -= width;
   }
@@ -186,10 +182,6 @@ m4_define([b4_location_define],
   class location
   {
   public:
-    /// Type for file name.
-    typedef position::filename_type filename_type;
-    /// 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)
@@ -204,18 +196,18 @@ m4_define([b4_location_define],
     {}
 
     /// Construct a 0-width location in \a f, \a l, \a c.
-    explicit location (filename_type* f,
-                       counter_type l = ]b4_location_initial_line[,
-                       counter_type c = ]b4_location_initial_column[)
+    explicit location (]b4_percent_define_get([[filename_type]])[* f,
+                       unsigned l = ]b4_location_initial_line[u,
+                       unsigned c = ]b4_location_initial_column[u)
       : begin (f, l, c)
       , end (f, l, c)
     {}
 
 ])[
     /// Initialization.
-    void initialize (filename_type* f = YY_NULLPTR,
-                     counter_type l = ]b4_location_initial_line[,
-                     counter_type c = ]b4_location_initial_column[)
+    void initialize (]b4_percent_define_get([[filename_type]])[* f = YY_NULLPTR,
+                     unsigned l = ]b4_location_initial_line[u,
+                     unsigned c = ]b4_location_initial_column[u)
     {
       begin.initialize (f, l, c);
       end = begin;
@@ -231,13 +223,13 @@ m4_define([b4_location_define],
     }
 
     /// Extend the current location to the COUNT next columns.
-    void columns (counter_type count = 1)
+    void columns (int count = 1)
     {
       end += count;
     }
 
     /// Extend the current location to the COUNT next lines.
-    void lines (counter_type count = 1)
+    void lines (int count = 1)
     {
       end.lines (count);
     }
@@ -252,45 +244,39 @@ 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, location::counter_type width)
+  inline location& operator+= (location& res, int width)
   {
     res.columns (width);
     return res;
   }
 
   /// Add \a width columns to the end position.
-  inline location
-  operator+ (location res, location::counter_type width)
+  inline location operator+ (location res, int width)
   {
     return res += width;
   }
 
   /// Subtract \a width columns to the end position, in place.
-  inline location&
-  operator-= (location& res, location::counter_type width)
+  inline location& operator-= (location& res, int width)
   {
     return res += -width;
   }
 
   /// Subtract \a width columns to the end position.
-  inline location
-  operator- (location res, location::counter_type width)
+  inline location operator- (location res, int width)
   {
     return res -= width;
   }
@@ -319,8 +305,7 @@ m4_define([b4_location_define],
   std::basic_ostream<YYChar>&
   operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
   {
-    location::counter_type end_col
-      = 0 < loc.end.column ? loc.end.column - 1 : 0;
+    unsigned end_col = 0 < loc.end.column ? loc.end.column - 1 : 0;
     ostr << loc.begin;
     if (loc.end.filename
         && (!loc.begin.filename
@@ -342,7 +327,7 @@ 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.
 
@@ -361,6 +346,7 @@ m4_ifdef([b4_location_file], [[
 
 ]b4_cpp_guard_open([b4_location_path])[
 
+# include <algorithm> // std::max
 # include <iostream>
 # include <string>
 

data/skeletons/README-D.txt

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

data/skeletons/d-skel.m4

@@ -1,26 +0,0 @@
-                                                            -*- 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

@@ -1,373 +0,0 @@
-                                                            -*- Autoconf -*-
-
-# D language support for Bison
-
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-
-# _b4_comment(TEXT, OPEN, CONTINUE, END)
-# --------------------------------------
-# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
-# Avoid adding indentation to the first line, as the indentation comes
-# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
-#
-# Prefix all the output lines with PREFIX.
-m4_define([_b4_comment],
-[$2[]m4_bpatsubst(m4_expand([[$1]]), [
-\(.\)], [
-$3\1])$4])
-
-
-# b4_comment(TEXT, [PREFIX])
-# --------------------------
-# Put TEXT in comment.  Prefix all the output lines with PREFIX.
-m4_define([b4_comment],
-[_b4_comment([$1], [$2/* ], [$2   ], [  */])])
-
-
-# b4_sync_start(LINE, FILE)
-# -------------------------
-m4_define([b4_sync_start], [[#]line $1 $2])
-
-
-# b4_list2(LIST1, LIST2)
-# ----------------------
-# Join two lists with a comma if necessary.
-m4_define([b4_list2],
-          [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
-
-
-# b4_percent_define_get3(DEF, PRE, POST, NOT)
-# -------------------------------------------
-# Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
-# otherwise NOT.
-m4_define([b4_percent_define_get3],
-          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
-                [$2[]b4_percent_define_get([$1])[]$3], [$4])])
-
-
-# b4_flag_value(BOOLEAN-FLAG)
-# ---------------------------
-m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
-
-
-# b4_parser_class_declaration
-# ---------------------------
-# The declaration of the parser class ("class YYParser"), with all its
-# qualifiers/annotations.
-b4_percent_define_default([[api.parser.abstract]], [[false]])
-b4_percent_define_default([[api.parser.final]],    [[false]])
-b4_percent_define_default([[api.parser.public]],   [[false]])
-
-m4_define([b4_parser_class_declaration],
-[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
-b4_percent_define_flag_if([api.parser.public],   [public ])dnl
-b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
-b4_percent_define_flag_if([api.parser.final],    [final ])dnl
-[class ]b4_parser_class[]dnl
-b4_percent_define_get3([api.parser.extends], [ extends ])dnl
-b4_percent_define_get3([api.parser.implements], [ implements ])])
-
-
-# b4_lexer_if(TRUE, FALSE)
-# ------------------------
-m4_define([b4_lexer_if],
-[b4_percent_code_ifdef([[lexer]], [$1], [$2])])
-
-
-# b4_position_type_if(TRUE, FALSE)
-# --------------------------------
-m4_define([b4_position_type_if],
-[b4_percent_define_ifdef([[position_type]], [$1], [$2])])
-
-
-# b4_location_type_if(TRUE, FALSE)
-# --------------------------------
-m4_define([b4_location_type_if],
-[b4_percent_define_ifdef([[location_type]], [$1], [$2])])
-
-
-# b4_identification
-# -----------------
-m4_define([b4_identification],
-[/** Version number for the Bison executable that generated this parser.  */
-  public static immutable string yy_bison_version = "b4_version";
-
-  /** Name of the skeleton that generated this parser.  */
-  public static immutable string yy_bison_skeleton = b4_skeleton;
-])
-
-
-## ------------ ##
-## Data types.  ##
-## ------------ ##
-
-# b4_int_type(MIN, MAX)
-# ---------------------
-# Return the smallest int type able to handle numbers ranging from
-# MIN to MAX (included).
-m4_define([b4_int_type],
-[m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
-       b4_ints_in($@, [-32768], [32767]), [1], [short],
-                                               [int])])
-
-# b4_int_type_for(NAME)
-# ---------------------
-# Return the smallest int type able to handle numbers ranging from
-# `NAME_min' to `NAME_max' (included).
-m4_define([b4_int_type_for],
-[b4_int_type($1_min, $1_max)])
-
-# b4_null
-# -------
-m4_define([b4_null], [null])
-
-
-# b4_integral_parser_table_define(NAME, DATA, COMMENT)
-#-----------------------------------------------------
-# Define "yy<TABLE-NAME>" whose contents is CONTENT.
-m4_define([b4_integral_parser_table_define],
-[m4_ifvaln([$3], [b4_comment([$3], [  ])])dnl
-private static immutable b4_int_type_for([$2])[[]] yy$1_ =
-@{
-  $2
-@};dnl
-])
-
-
-## ------------- ##
-## Token kinds.  ##
-## ------------- ##
-
-m4_define([b4_symbol(-2, id)],  [[YYEMPTY]])
-
-# b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
-# ---------------------------------------
-# Output the definition of this token as an enum.
-m4_define([b4_token_enum],
-[b4_token_format([  %s = %s,
-], [$1])])
-
-# b4_token_enums
-# --------------
-# Output the definition of the tokens as enums.
-m4_define([b4_token_enums],
-[/* Token kinds.  */
-public enum TokenKind {
-  ]b4_symbol_kind([-2])[ = -2,
-b4_symbol_foreach([b4_token_enum])dnl
-}
-])
-
-
-
-## -------------- ##
-## Symbol kinds.  ##
-## -------------- ##
-
-b4_percent_define_default([[api.symbol.prefix]], [[S_]])
-
-# b4_symbol_kind(NUM)
-# -------------------
-m4_define([b4_symbol_kind],
-[SymbolKind.b4_symbol_kind_base($@)])
-
-
-# b4_symbol_enum(SYMBOL-NUM)
-# --------------------------
-# Output the definition of this symbol as an enum.
-m4_define([b4_symbol_enum],
-[m4_format([    %-30s %s],
-           m4_format([[%s = %s,]],
-                     b4_symbol([$1], [kind_base]),
-                     [$1]),
-           [b4_symbol_tag_comment([$1])])])
-
-
-# b4_declare_symbol_enum
-# ----------------------
-# The definition of the symbol internal numbers as an enum.
-# Defining YYEMPTY here is important: it forces the compiler
-# to use a signed type, which matters for yytoken.
-m4_define([b4_declare_symbol_enum],
-[[  /* Symbol kinds.  */
-  public enum SymbolKind
-  {
-    ]b4_symbol(-2, kind_base)[ = -2,  /* No symbol.  */
-]b4_symbol_foreach([b4_symbol_enum])dnl
-[  };
-]])])
-
-
-
-# b4-case(ID, CODE, [COMMENTS])
-# -----------------------------
-m4_define([b4_case], [    case $1:m4_ifval([$3], [ b4_comment([$3])])
-$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/lalr1.d

@@ -1,923 +0,0 @@
-# D skeleton for Bison -*- autoconf -*-
-
-# Copyright (C) 2007-2012, 2019-2020 Free Software Foundation, Inc.
-
-# This program is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-m4_include(b4_skeletonsdir/[d.m4])
-
-
-b4_output_begin([b4_parser_file_name])
-b4_copyright([Skeleton implementation for Bison LALR(1) parsers in D],
-             [2007-2012, 2019-2020])[
-]b4_disclaimer[
-]b4_percent_define_ifdef([package], [module b4_percent_define_get([package]);
-])[
-version(D_Version2) {
-} else {
-  static assert(false, "need compiler for D Version 2");
-}
-
-]b4_user_pre_prologue[
-]b4_user_post_prologue[
-]b4_percent_code_get([[imports]])[
-import std.format;
-
-/**
- * A Bison parser, automatically generated from <tt>]m4_bpatsubst(b4_file_name, [^"\(.*\)"$], [\1])[</tt>.
- *
- * @@author LALR (1) parser skeleton written by Paolo Bonzini.
- * Port to D language was done by Oliver Mangold.
- */
-
-/**
- * Communication interface between the scanner and the Bison-generated
- * parser <tt>]b4_parser_class[</tt>.
- */
-public interface Lexer
-{]b4_locations_if([[
-  /**
-   * Method to retrieve the beginning position of the last scanned token.
-   * @@return the position at which the last scanned token starts.  */
-  @@property ]b4_position_type[ startPos ();
-
-  /**
-   * Method to retrieve the ending position of the last scanned token.
-   * @@return the first position beyond the last scanned token.  */
-  @@property ]b4_position_type[ endPos ();
-
-]])[
-  /**
-   * Method to retrieve the semantic value of the last scanned token.
-   * @@return the semantic value of the last scanned token.  */
-  @@property ]b4_yystype[ semanticVal ();
-
-  /**
-   * Entry point for the scanner.  Returns the token identifier corresponding
-   * to the next token and prepares to return the semantic value
-   * ]b4_locations_if([and beginning/ending positions ])[of the token.
-   * @@return the token identifier corresponding to the next token. */
-  int yylex ();
-
-  /**
-   * Entry point for error reporting.  Emits an error
-   * ]b4_locations_if([referring to the given location ])[in a user-defined way.
-   *]b4_locations_if([[
-   * @@param loc The location of the element to which the
-   *                error message is related]])[
-   * @@param s The string for the error message.  */
-   void yyerror (]b4_locations_if([b4_location_type[ loc, ]])[string s);
-}
-
-]b4_locations_if([b4_position_type_if([[
-static assert(__traits(compiles,
-              (new ]b4_position_type[[1])[0]=(new ]b4_position_type[[1])[0]),
-              "struct/class ]b4_position_type[ must be default-constructible "
-              "and assignable");
-static assert(__traits(compiles, (new string[1])[0]=(new ]b4_position_type[).toString()),
-              "error: struct/class ]b4_position_type[ must have toString method");
-]], [[
-  /**
-   * A struct denoting a point in the input.*/
-public struct ]b4_position_type[ {
-
-  /** The column index within the line of input.  */
-  public int column = 1;
-  /** The line number within an input file.  */
-  public int line = 1;
-  /** The name of the input file.  */
-  public string filename = null;
-
-  /**
-   * A string representation of the position. */
-  public string toString() const {
-    if (filename)
-      return format("%s:%d.%d", filename, line, column);
-    else
-      return format("%d.%d", line, column);
-  }
-}
-]])b4_location_type_if([[
-static assert(__traits(compiles, (new ]b4_location_type[((new ]b4_position_type[[1])[0]))) &&
-              __traits(compiles, (new ]b4_location_type[((new ]b4_position_type[[1])[0], (new ]b4_position_type[[1])[0]))),
-              "error: struct/class ]b4_location_type[ must have "
-              "default constructor and constructors this(]b4_position_type[) and this(]b4_position_type[, ]b4_position_type[).");
-static assert(__traits(compiles, (new ]b4_location_type[[1])[0].begin=(new ]b4_location_type[[1])[0].begin) &&
-              __traits(compiles, (new ]b4_location_type[[1])[0].begin=(new ]b4_location_type[[1])[0].end) &&
-              __traits(compiles, (new ]b4_location_type[[1])[0].end=(new ]b4_location_type[[1])[0].begin) &&
-              __traits(compiles, (new ]b4_location_type[[1])[0].end=(new ]b4_location_type[[1])[0].end),
-              "error: struct/class ]b4_location_type[ must have assignment-compatible "
-              "members/properties 'begin' and 'end'.");
-static assert(__traits(compiles, (new string[1])[0]=(new ]b4_location_type[[1])[0].toString()),
-              "error: struct/class ]b4_location_type[ must have toString method.");
-
-private immutable bool yy_location_is_class = !__traits(compiles, *(new ]b4_location_type[((new ]b4_position_type[[1])[0])));]], [[
-/**
- * A class defining a pair of positions.  Positions, defined by the
- * <code>]b4_position_type[</code> class, denote a point in the input.
- * Locations represent a part of the input through the beginning
- * and ending positions.  */
-public class ]b4_location_type[
-{
-  /** The first, inclusive, position in the range.  */
-  public ]b4_position_type[ begin;
-
-  /** The first position beyond the range.  */
-  public ]b4_position_type[ end;
-
-  /**
-   * Create a <code>]b4_location_type[</code> denoting an empty range located at
-   * a given point.
-   * @@param loc The position at which the range is anchored.  */
-  public this (]b4_position_type[ loc) {
-    this.begin = this.end = loc;
-  }
-
-  public this () {
-  }
-
-  /**
-   * Create a <code>]b4_location_type[</code> from the endpoints of the range.
-   * @@param begin The first position included in the range.
-   * @@param end   The first position beyond the range.  */
-  public this (]b4_position_type[ begin, ]b4_position_type[ end)
-  {
-    this.begin = begin;
-    this.end = end;
-  }
-
-  /**
-   * A representation of the location. For this to be correct,
-   * <code>]b4_position_type[</code> should override the <code>toString</code>
-   * method.  */
-  public override string toString () const {
-    auto end_col = 0 < end.column ? end.column - 1 : 0;
-    auto res = begin.toString ();
-    if (end.filename && begin.filename != end.filename)
-      res ~= "-" ~ format("%s:%d.%d", end.filename, end.line, end_col);
-    else if (begin.line < end.line)
-      res ~= "-" ~ format("%d.%d", end.line, end_col);
-    else if (begin.column < end_col)
-      res ~= "-" ~ format("%d", end_col);
-    return res;
-  }
-}
-
-private immutable bool yy_location_is_class = true;
-
-]])])m4_ifdef([b4_user_union_members], [private union YYSemanticType
-{
-b4_user_union_members
-};],
-[m4_if(b4_tag_seen_flag, 0,
-[[private alias int YYSemanticType;]])])[
-]b4_token_enums[
-]b4_parser_class_declaration[
-{
-  ]b4_identification[
-
-]b4_declare_symbol_enum[
-
-]b4_locations_if([[
-  private final ]b4_location_type[ yylloc_from_stack (ref YYStack rhs, int n)
-  {
-    static if (yy_location_is_class) {
-      if (n > 0)
-        return new ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
-      else
-        return new ]b4_location_type[ (rhs.locationAt (0).end);
-    } else {
-      if (n > 0)
-        return ]b4_location_type[ (rhs.locationAt (n-1).begin, rhs.locationAt (0).end);
-      else
-        return ]b4_location_type[ (rhs.locationAt (0).end);
-    }
-  }]])[
-
-]b4_lexer_if([[  private class YYLexer implements Lexer {
-]b4_percent_code_get([[lexer]])[
-  }
-]])[
-  /** The object doing lexical analysis for us.  */
-  private Lexer yylexer;
-
-]b4_parse_param_vars[
-
-]b4_lexer_if([[
-  /**
-   * Instantiate the Bison-generated parser.
-   */
-  public this] (b4_parse_param_decl([b4_lex_param_decl])[) {
-    this (new YYLexer(]b4_lex_param_call[));
-  }
-]])[
-
-  /**
-   * Instantiate the Bison-generated parser.
-   * @@param yylexer The scanner that will supply tokens to the parser.
-   */
-  ]b4_lexer_if([[protected]], [[public]]) [this (]b4_parse_param_decl([[Lexer yylexer]])[) {
-    this.yylexer = yylexer;]b4_parse_trace_if([[
-    this.yyDebugStream = stderr;]])[
-]b4_parse_param_cons[
-  }
-]b4_parse_trace_if([[
-  private File yyDebugStream;
-
-  /**
-   * The <tt>File</tt> on which the debugging output is
-   * printed.
-   */
-  public File getDebugStream () { return yyDebugStream; }
-
-  /**
-   * Set the <tt>std.File</tt> on which the debug output is printed.
-   * @@param s The stream that is used for debugging output.
-   */
-  public final void setDebugStream(File s) { yyDebugStream = s; }
-
-  private int yydebug = 0;
-
-  /**
-   * Answer the verbosity of the debugging output; 0 means that all kinds of
-   * output from the parser are suppressed.
-   */
-  public final int getDebugLevel() { return yydebug; }
-
-  /**
-   * Set the verbosity of the debugging output; 0 means that all kinds of
-   * output from the parser are suppressed.
-   * @@param level The verbosity level for debugging output.
-   */
-  public final void setDebugLevel(int level) { yydebug = level; }
-
-  protected final void yycdebug (string s) {
-    if (0 < yydebug)
-      yyDebugStream.write (s);
-  }
-
-  protected final void yycdebugln (string s) {
-    if (0 < yydebug)
-      yyDebugStream.writeln (s);
-  }
-]])[
-  private final int yylex () {
-    return yylexer.yylex ();
-  }
-
-  protected final void yyerror (]b4_locations_if(ref [b4_location_type[ loc, ]])[string s) {
-    yylexer.yyerror (]b4_locations_if([loc, ])[s);
-  }
-
-  /**
-   * Returned by a Bison action in order to stop the parsing process and
-   * return success (<tt>true</tt>).  */
-  public static immutable int YYACCEPT = 0;
-
-  /**
-   * Returned by a Bison action in order to stop the parsing process and
-   * return failure (<tt>false</tt>).  */
-  public static immutable int YYABORT = 1;
-
-  /**
-   * Returned by a Bison action in order to start error recovery without
-   * printing an error message.  */
-  public static immutable int YYERROR = 2;
-
-  // Internal return codes that are not supported for user semantic
-  // actions.
-  private static immutable int YYERRLAB = 3;
-  private static immutable int YYNEWSTATE = 4;
-  private static immutable int YYDEFAULT = 5;
-  private static immutable int YYREDUCE = 6;
-  private static immutable int YYERRLAB1 = 7;
-  private static immutable int YYRETURN = 8;
-]b4_locations_if([
-  private static immutable YYSemanticType yy_semantic_null;])[
-  private int yyerrstatus_ = 0;
-
-  /**
-   * Whether error recovery is being done.  In this state, the parser
-   * reads token until it reaches a known state, and then restarts normal
-   * operation.  */
-  public final bool recovering ()
-  {
-    return yyerrstatus_ == 0;
-  }
-
-  private int yyaction (int yyn, ref YYStack yystack, int yylen)
-  {
-    ]b4_yystype[ yyval;]b4_locations_if([[
-    ]b4_location_type[ yyloc = yylloc_from_stack (yystack, yylen);]])[
-
-    /* If YYLEN is nonzero, implement the default value of the action:
-       `$$ = $1'.  Otherwise, use the top of the stack.
-
-       Otherwise, the following line sets YYVAL to garbage.
-       This behavior is undocumented and Bison
-       users should not rely upon it.  */
-    if (yylen > 0)
-      yyval = yystack.valueAt (yylen - 1);
-    else
-      yyval = yystack.valueAt (0);
-
-]b4_parse_trace_if([[
-    yy_reduce_print (yyn, yystack);]])[
-
-    switch (yyn)
-    {
-]b4_user_actions[
-      default: break;
-    }
-
-]b4_parse_trace_if([[
-    import std.conv : to;
-    yy_symbol_print ("-> $$ =", to!SymbolKind (yyr1_[yyn]), yyval]b4_locations_if([, yyloc])[);]])[
-
-    yystack.pop (yylen);
-    yylen = 0;
-
-    /* Shift the result of the reduction.  */
-    yyn = yyr1_[yyn];
-    int yystate = yypgoto_[yyn - yyntokens_] + yystack.stateAt (0);
-    if (0 <= yystate && yystate <= yylast_
-        && yycheck_[yystate] == yystack.stateAt (0))
-      yystate = yytable_[yystate];
-    else
-      yystate = yydefgoto_[yyn - yyntokens_];
-
-    yystack.push (yystate, yyval]b4_locations_if([, yyloc])[);
-    return YYNEWSTATE;
-  }
-
-  /* Return YYSTR after stripping away unnecessary quotes and
-     backslashes, so that it's suitable for yyerror.  The heuristic is
-     that double-quoting is unnecessary unless the string contains an
-     apostrophe, a comma, or backslash (other than backslash-backslash).
-     YYSTR is taken from yytname.  */
-  private final string yytnamerr_ (string yystr)
-  {
-    if (yystr[0] == '"')
-      {
-        string yyr;
-      strip_quotes:
-        for (int i = 1; i < yystr.length; i++)
-          switch (yystr[i])
-            {
-            case '\'':
-            case ',':
-              break strip_quotes;
-
-            case '\\':
-              if (yystr[++i] != '\\')
-                break strip_quotes;
-              goto default;
-            default:
-              yyr ~= yystr[i];
-              break;
-
-            case '"':
-              return yyr;
-            }
-      }
-    else if (yystr == "$end")
-      return "end of input";
-
-    return yystr;
-  }
-]b4_parse_trace_if([[
-  /*--------------------------------.
-  | Print this symbol on YYOUTPUT.  |
-  `--------------------------------*/
-
-  private final void yy_symbol_print (string s, SymbolKind yykind,
-    ref ]b4_yystype[ yyvaluep]dnl
-b4_locations_if([, ref ]b4_location_type[ yylocationp])[)
-  {
-    if (0 < yydebug)
-    {
-      string message = s ~ (yykind < yyntokens_ ? " token " : " nterm ")
-              ~ yytname_[yykind] ~ " ("]b4_locations_if([
-              ~ yylocationp.toString() ~ ": "])[;
-      static if (__traits(compiles, message ~= yyvaluep.toString ()))
-              message ~= yyvaluep.toString ();
-      else
-              message ~= format ("%s", &yyvaluep);
-      message ~= ")";
-      yycdebugln (message);
-    }
-  }
-]])[
-  /**
-   * Parse input from the scanner that was specified at object construction
-   * time.  Return whether the end of the input was reached successfully.
-   *
-   * @@return <tt>true</tt> if the parsing succeeds.  Note that this does not
-   *          imply that there were no syntax errors.
-   */
-  public bool parse ()
-  {
-    // Lookahead token kind.
-    int yychar = TokenKind.YYEMPTY;
-    // Lookahead symbol kind.
-    SymbolKind yytoken = ]b4_symbol(-2, kind)[;
-
-    /* State.  */
-    int yyn = 0;
-    int yylen = 0;
-    int yystate = 0;
-
-    YYStack yystack;
-
-    /* Error handling.  */
-    int yynerrs_ = 0;]b4_locations_if([[
-    /// The location where the error started.
-    ]b4_location_type[ yyerrloc = null;
-
-    /// ]b4_location_type[ of the lookahead.
-    ]b4_location_type[ yylloc;
-
-    /// @@$.
-    ]b4_location_type[ yyloc;]])[
-
-    /// Semantic value of the lookahead.
-    ]b4_yystype[ yylval;
-
-    bool yyresult;]b4_parse_trace_if([[
-
-    yycdebugln ("Starting parse");]])[
-    yyerrstatus_ = 0;
-
-]m4_ifdef([b4_initial_action], [
-m4_pushdef([b4_at_dollar],     [yylloc])dnl
-m4_pushdef([b4_dollar_dollar], [yylval])dnl
-    /* User initialization code.  */
-    b4_user_initial_action
-m4_popdef([b4_dollar_dollar])dnl
-m4_popdef([b4_at_dollar])])dnl
-
-  [  /* Initialize the stack.  */
-    yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
-
-    int label = YYNEWSTATE;
-    for (;;)
-      final switch (label)
-      {
-        /* New state.  Unlike in the C/C++ skeletons, the state is already
-           pushed when we come here.  */
-      case YYNEWSTATE:]b4_parse_trace_if([[
-        yycdebugln (format("Entering state %d", yystate));
-        if (0 < yydebug)
-          yystack.print (yyDebugStream);]])[
-
-        /* Accept?  */
-        if (yystate == yyfinal_)
-          return true;
-
-        /* Take a decision.  First try without lookahead.  */
-        yyn = yypact_[yystate];
-        if (yy_pact_value_is_default_ (yyn))
-        {
-          label = YYDEFAULT;
-          break;
-        }
-
-        /* Read a lookahead token.  */
-        if (yychar == TokenKind.YYEMPTY)
-        {]b4_parse_trace_if([[
-          yycdebugln ("Reading a token");]])[
-          yychar = yylex ();]b4_locations_if([[
-          static if (yy_location_is_class) {
-            yylloc = new ]b4_location_type[(yylexer.startPos, yylexer.endPos);
-          } else {
-            yylloc = ]b4_location_type[(yylexer.startPos, yylexer.endPos);
-          }]])
-          yylval = yylexer.semanticVal;[
-        }
-
-        /* Convert token to internal form.  */
-        yytoken = yytranslate_ (yychar);]b4_parse_trace_if([[
-        yy_symbol_print ("Next token is", yytoken, yylval]b4_locations_if([, yylloc])[);]])[
-
-        if (yytoken == ]b4_symbol(1, kind)[)
-        {
-          // The scanner already issued an error message, process directly
-          // to error recovery.  But do not keep the error token as
-          // lookahead, it is too special and may lead us to an endless
-          // loop in error recovery. */
-          yychar = TokenKind.]b4_symbol(2, id)[;
-          yytoken = ]b4_symbol(2, kind)[;]b4_locations_if([[
-          yyerrloc = yylloc;]])[
-          label = YYERRLAB1;
-        }
-        else
-        {
-          /* If the proper action on seeing token YYTOKEN is to reduce or to
-             detect an error, take that action.  */
-          yyn += yytoken;
-          if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yytoken)
-            label = YYDEFAULT;
-
-          /* <= 0 means reduce or error.  */
-          else if ((yyn = yytable_[yyn]) <= 0)
-          {
-            if (yy_table_value_is_error_ (yyn))
-              label = YYERRLAB;
-            else
-            {
-              yyn = -yyn;
-              label = YYREDUCE;
-            }
-          }
-          else
-          {
-            /* Shift the lookahead token.  */]b4_parse_trace_if([[
-            yy_symbol_print ("Shifting", yytoken, yylval]b4_locations_if([, yylloc])[);]])[
-
-            /* Discard the token being shifted.  */
-            yychar = TokenKind.YYEMPTY;
-
-            /* Count tokens shifted since error; after three, turn off error
-             * status.  */
-            if (yyerrstatus_ > 0)
-              --yyerrstatus_;
-
-            yystate = yyn;
-            yystack.push (yystate, yylval]b4_locations_if([, yylloc])[);
-            label = YYNEWSTATE;
-          }
-        }
-        break;
-
-      /*-----------------------------------------------------------.
-      | yydefault -- do the default action for the current state.  |
-      `-----------------------------------------------------------*/
-      case YYDEFAULT:
-        yyn = yydefact_[yystate];
-        if (yyn == 0)
-          label = YYERRLAB;
-        else
-          label = YYREDUCE;
-        break;
-
-      /*-----------------------------.
-      | yyreduce -- Do a reduction.  |
-      `-----------------------------*/
-      case YYREDUCE:
-        yylen = yyr2_[yyn];
-        label = yyaction (yyn, yystack, yylen);
-        yystate = yystack.stateAt (0);
-        break;
-
-      /*--------------------------------------.
-      | yyerrlab -- here on detecting error.  |
-      `--------------------------------------*/
-      case YYERRLAB:
-        /* If not already recovering from an error, report this error.  */
-        if (yyerrstatus_ == 0)
-        {
-          ++yynerrs_;
-          if (yychar == TokenKind.]b4_symbol(-2, id)[)
-            yytoken = ]b4_symbol(-2, kind)[;
-          yyerror (]b4_locations_if([yylloc, ])[yysyntax_error (yystate, yytoken));
-        }
-]b4_locations_if([
-        yyerrloc = yylloc;])[
-        if (yyerrstatus_ == 3)
-        {
-          /* If just tried and failed to reuse lookahead token after an
-           * error, discard it.  */
-
-          if (yychar <= TokenKind.]b4_symbol(0, [id])[)
-          {
-            /* Return failure if at end of input.  */
-            if (yychar == TokenKind.]b4_symbol(0, [id])[)
-             return false;
-          }
-          else
-            yychar = TokenKind.YYEMPTY;
-        }
-
-        /* Else will try to reuse lookahead token after shifting the error
-         * token.  */
-        label = YYERRLAB1;
-        break;
-
-      /*-------------------------------------------------.
-      | errorlab -- error raised explicitly by YYERROR.  |
-      `-------------------------------------------------*/
-      case YYERROR:]b4_locations_if([
-        yyerrloc = yystack.locationAt (yylen - 1);])[
-        /* Do not reclaim the symbols of the rule which action triggered
-           this YYERROR.  */
-        yystack.pop (yylen);
-        yylen = 0;
-        yystate = yystack.stateAt (0);
-        label = YYERRLAB1;
-        break;
-
-      /*-------------------------------------------------------------.
-      | yyerrlab1 -- common code for both syntax error and YYERROR.  |
-      `-------------------------------------------------------------*/
-      case YYERRLAB1:
-        yyerrstatus_ = 3;       /* Each real token shifted decrements this.  */
-
-        // Pop stack until we find a state that shifts the error token.
-        for (;;)
-        {
-          yyn = yypact_[yystate];
-          if (!yy_pact_value_is_default_ (yyn))
-          {
-            yyn += ]b4_symbol(1, kind)[;
-            if (0 <= yyn && yyn <= yylast_ && yycheck_[yyn] == ]b4_symbol(1, kind)[)
-            {
-              yyn = yytable_[yyn];
-              if (0 < yyn)
-                break;
-                  }
-          }
-
-          /* Pop the current state because it cannot handle the error token.  */
-          if (yystack.height == 1)
-            return false;
-
-]b4_locations_if([          yyerrloc = yystack.locationAt (0);])[
-          yystack.pop ();
-          yystate = yystack.stateAt (0);]b4_parse_trace_if([[
-          if (0 < yydebug)
-            yystack.print (yyDebugStream);]])[
-        }
-
-]b4_locations_if([
-        /* Muck with the stack to setup for yylloc.  */
-        yystack.push (0, yy_semantic_null, yylloc);
-        yystack.push (0, yy_semantic_null, yyerrloc);
-        yyloc = yylloc_from_stack (yystack, 2);
-        yystack.pop (2);])[
-
-        /* Shift the error token.  */]b4_parse_trace_if([[
-        import std.conv : to;
-        yy_symbol_print ("Shifting", to!SymbolKind (yystos_[yyn]), yylval]b4_locations_if([, yyloc])[);]])[
-        yystate = yyn;
-        yystack.push (yyn, yylval]b4_locations_if([, yyloc])[);
-        label = YYNEWSTATE;
-        break;
-
-      /* Accept.  */
-      case YYACCEPT:
-        yyresult = true;
-        label = YYRETURN;
-        break;
-
-      /* Abort.  */
-      case YYABORT:
-        yyresult = false;
-        label = YYRETURN;
-        break;
-
-      case YYRETURN:]b4_parse_trace_if([[
-        if (0 < yydebug)
-          yystack.print (yyDebugStream);]])[
-        return yyresult;
-    }
-  }
-
-  // Generate an error message.
-  private final string yysyntax_error (int yystate, SymbolKind tok)
-  {]b4_parse_error_case([verbose], [[
-    /* There are many possibilities here to consider:
-       - Assume YYFAIL is not used.  It's too flawed to consider.
-         See
-         <http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html>
-         for details.  YYERROR is fine as it does not invoke this
-         function.
-       - If this state is a consistent state with a default action,
-         then the only way this function was invoked is if the
-         default action is an error action.  In that case, don't
-         check for expected tokens because there are none.
-       - The only way there can be no lookahead present (in tok) is
-         if this state is a consistent state with a default action.
-         Thus, detecting the absence of a lookahead is sufficient to
-         determine that there is no unexpected or expected token to
-         report.  In that case, just report a simple "syntax error".
-       - Don't assume there isn't a lookahead just because this
-         state is a consistent state with a default action.  There
-         might have been a previous inconsistent state, consistent
-         state with a non-default action, or user semantic action
-         that manipulated yychar.  (However, yychar is currently out
-         of scope during semantic actions.)
-       - Of course, the expected token list depends on states to
-         have correct lookahead information, and it depends on the
-         parser not to perform extra reductions after fetching a
-         lookahead from the scanner and before detecting a syntax
-         error.  Thus, state merging (from LALR or IELR) and default
-         reductions corrupt the expected token list.  However, the
-         list is correct for canonical LR with one exception: it
-         will still contain any token that will not be accepted due
-         to an error action in a later state.
-      */
-    if (tok != ]b4_symbol(-2, kind)[)
-    {
-      // FIXME: This method of building the message is not compatible
-      // with internationalization.
-      string res = "syntax error, unexpected ";
-      res ~= yytnamerr_ (yytname_[tok]);
-      int yyn = yypact_[yystate];
-      if (!yy_pact_value_is_default_ (yyn))
-      {
-        /* Start YYX at -YYN if negative to avoid negative
-           indexes in YYCHECK.  In other words, skip the first
-           -YYN actions for this state because they are default
-           actions.  */
-        int yyxbegin = yyn < 0 ? -yyn : 0;
-        /* Stay within bounds of both yycheck and yytname.  */
-        int yychecklim = yylast_ - yyn + 1;
-        int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
-        int count = 0;
-        for (int x = yyxbegin; x < yyxend; ++x)
-          if (yycheck_[x + yyn] == x && x != ]b4_symbol(1, kind)[
-              && !yy_table_value_is_error_ (yytable_[x + yyn]))
-             ++count;
-          if (count < 5)
-          {
-             count = 0;
-             for (int x = yyxbegin; x < yyxend; ++x)
-               if (yycheck_[x + yyn] == x && x != ]b4_symbol(1, kind)[
-                   && !yy_table_value_is_error_ (yytable_[x + yyn]))
-               {
-                  res ~= count++ == 0 ? ", expecting " : " or ";
-                  res ~= yytnamerr_ (yytname_[x]);
-               }
-          }
-      }
-      return res;
-    }]])[
-    return "syntax error";
-  }
-
-  /**
-   * Whether the given <code>yypact_</code> value indicates a defaulted state.
-   * @@param yyvalue   the value to check
-   */
-  private static bool yy_pact_value_is_default_ (int yyvalue)
-  {
-    return yyvalue == yypact_ninf_;
-  }
-
-  /**
-   * Whether the given <code>yytable_</code> value indicates a syntax error.
-   * @@param yyvalue   the value to check
-   */
-  private static bool yy_table_value_is_error_ (int yyvalue)
-  {
-    return yyvalue == yytable_ninf_;
-  }
-
-  /* YYPACT[STATE-NUM] -- Index in YYTABLE of the portion describing
-     STATE-NUM.  */
-  private static immutable ]b4_int_type_for([b4_pact])[ yypact_ninf_ = ]b4_pact_ninf[;
-
-  /* YYTABLE[YYPACT[STATE-NUM]].  What to do in state STATE-NUM.  If
-     positive, shift that token.  If negative, reduce the rule which
-     number is the opposite.  If YYTABLE_NINF_, syntax error.  */
-  private static immutable ]b4_int_type_for([b4_table])[ yytable_ninf_ = ]b4_table_ninf[;
-
-  ]b4_parser_tables_define[
-
-  /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
-     First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
-  private static immutable string[] yytname_ =
-  @{
-  ]b4_tname[
-  @};
-
-]b4_parse_trace_if([[
-  /* YYRLINE[YYN] -- Source line where rule number YYN was defined.  */
-  private static immutable ]b4_int_type_for([b4_rline])[[] yyrline_ =
-  @{
-  ]b4_rline[
-  @};
-
-  // Report on the debug stream that the rule yyrule is going to be reduced.
-  private final void yy_reduce_print (int yyrule, ref YYStack yystack)
-  {
-    if (yydebug == 0)
-      return;
-
-    int yylno = yyrline_[yyrule];
-    int yynrhs = yyr2_[yyrule];
-    /* Print the symbols being reduced, and their result.  */
-    yycdebugln (format("Reducing stack by rule %d (line %d):",
-                yyrule - 1, yylno));
-
-    /* The symbols being reduced.  */
-    import std.conv : to;
-    for (int yyi = 0; yyi < yynrhs; yyi++)
-      yy_symbol_print (format("   $%d =", yyi + 1),
-                       to!SymbolKind (yystos_[yystack.stateAt(yynrhs - (yyi + 1))]),
-                       ]b4_rhs_value(yynrhs, yyi + 1)b4_locations_if([,
-                       b4_rhs_location(yynrhs, yyi + 1)])[);
-  }
-]])[
-
-  private static SymbolKind yytranslate_ (int t)
-  {
-]b4_api_token_raw_if(
-[[    import std.conv : to;
-    return to!SymbolKind (t);]],
-[[    /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX.  */
-    immutable ]b4_int_type_for([b4_translate])[[] translate_table =
-    @{
-  ]b4_translate[
-    @};
-
-    // Last valid token kind.
-    immutable int code_max = ]b4_code_max[;
-
-    if (t <= 0)
-      return ]b4_symbol(0, kind)[;
-    else if (t <= code_max)
-      {
-        import std.conv : to;
-        return to!SymbolKind (translate_table[t]);
-      }
-    else
-      return ]b4_symbol(2, kind)[;]])[
-  }
-
-  private static immutable int yylast_ = ]b4_last[;
-  private static immutable int yynnts_ = ]b4_nterms_number[;
-  private static immutable int yyfinal_ = ]b4_final_state_number[;
-  private static immutable int yyntokens_ = ]b4_tokens_number[;
-
-  private final struct YYStackElement {
-    int state;
-    ]b4_yystype[ value;]b4_locations_if(
-    b4_location_type[[] location;])[
-  }
-
-  private final struct YYStack {
-    private YYStackElement[] stack = [];
-
-    public final @@property ulong height()
-    {
-      return stack.length;
-    }
-
-    public final void push (int state, ]b4_yystype[ value]dnl
-  b4_locations_if([, ref ]b4_location_type[ loc])[)
-    {
-      stack ~= YYStackElement(state, value]b4_locations_if([, loc])[);
-    }
-
-    public final void pop ()
-    {
-      pop (1);
-    }
-
-    public final void pop (int num)
-    {
-      stack.length -= num;
-    }
-
-    public final int stateAt (int i)
-    {
-      return stack[$-i-1].state;
-    }
-
-]b4_locations_if([[
-    public final ref ]b4_location_type[ locationAt (int i)
-    {
-      return stack[$-i-1].location;
-    }]])[
-
-    public final ref ]b4_yystype[ valueAt (int i)
-    {
-      return stack[$-i-1].value;
-    }
-]b4_parse_trace_if([[
-    // Print the state stack on the debug stream.
-    public final void print (File stream)
-    {
-      stream.write ("Stack now");
-      for (int i = 0; i < stack.length; i++)
-        stream.write (" ", stack[i].state);
-      stream.writeln ();
-    }]])[
-  }
-]b4_percent_code_get[
-}
-]b4_percent_code_get([[epilogue]])[]dnl
-b4_epilogue[]dnl
-b4_output_end

data/skeletons/stack.hh

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

data/skeletons/traceon.m4

@@ -1,2 +0,0 @@
-dnl GNU M4 treats -dV in a position-independent manner.
-m4_debugmode(V)m4_traceon()dnl

data/skeletons/variant.hh

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

@@ -0,0 +1,159 @@
+# 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

@@ -0,0 +1,427 @@
+# 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, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018 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, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -159,7 +159,7 @@
   <xsl:param name="prev-rule-number"
     select="preceding-sibling::item[1]/@rule-number"/>
   <xsl:apply-templates select="key('bison:ruleByNumber', @rule-number)">
-    <xsl:with-param name="dot" select="@dot"/>
+    <xsl:with-param name="point" select="@point"/>
     <xsl:with-param name="num" select="@rule-number"/>
     <xsl:with-param name="prev-lhs"
       select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
@@ -169,7 +169,7 @@
 </xsl:template>
 
 <xsl:template match="rule">
-  <xsl:param name="dot"/>
+  <xsl:param name="point"/>
   <xsl:param name="num"/>
   <xsl:param name="prev-lhs"/>
   <xsl:text>&#10;</xsl:text>
@@ -198,14 +198,14 @@
       <xsl:text>:</xsl:text>
     </xsl:otherwise>
   </xsl:choose>
-  <xsl:if test="$dot = 0">
+  <xsl:if test="$point = 0">
     <xsl:text> .</xsl:text>
   </xsl:if>
 
   <!-- RHS -->
   <xsl:for-each select="rhs/symbol|rhs/empty">
     <xsl:apply-templates select="."/>
-    <xsl:if test="$dot = position()">
+    <xsl:if test="$point = position()">
       <xsl:text> .</xsl:text>
     </xsl:if>
   </xsl:for-each>

data/xslt/xml2text.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2text.xsl - transform Bison XML Report into plain text.
 
-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -52,7 +52,7 @@
   <xsl:if test="nonterminal[@usefulness='useless-in-grammar']">
     <xsl:text>Nonterminals useless in grammar&#10;&#10;</xsl:text>
     <xsl:for-each select="nonterminal[@usefulness='useless-in-grammar']">
-      <xsl:text>    </xsl:text>
+      <xsl:text>   </xsl:text>
       <xsl:value-of select="@name"/>
       <xsl:text>&#10;</xsl:text>
     </xsl:for-each>
@@ -65,7 +65,7 @@
     <xsl:text>Terminals unused in grammar&#10;&#10;</xsl:text>
     <xsl:for-each select="terminal[@usefulness='unused-in-grammar']">
       <xsl:sort select="@symbol-number" data-type="number"/>
-      <xsl:text>    </xsl:text>
+      <xsl:text>   </xsl:text>
       <xsl:value-of select="@name"/>
       <xsl:text>&#10;</xsl:text>
     </xsl:for-each>
@@ -136,7 +136,6 @@
 </xsl:template>
 
 <xsl:template match="terminal">
-  <xsl:text>    </xsl:text>
   <xsl:value-of select="@name"/>
   <xsl:call-template name="line-wrap">
     <xsl:with-param name="first-line-length">
@@ -149,9 +148,6 @@
     </xsl:with-param>
     <xsl:with-param name="line-length" select="66" />
     <xsl:with-param name="text">
-      <xsl:if test="string-length(@type) != 0">
-        <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
-      </xsl:if>
       <xsl:value-of select="concat(' (', @token-number, ')')"/>
       <xsl:for-each select="key('bison:ruleByRhs', @name)">
         <xsl:value-of select="concat(' ', @number)"/>
@@ -161,18 +157,14 @@
 </xsl:template>
 
 <xsl:template match="nonterminal">
-  <xsl:text>    </xsl:text>
   <xsl:value-of select="@name"/>
-  <xsl:if test="string-length(@type) != 0">
-    <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
-  </xsl:if>
   <xsl:value-of select="concat(' (', @symbol-number, ')')"/>
   <xsl:text>&#10;</xsl:text>
   <xsl:variable name="output">
     <xsl:call-template name="line-wrap">
       <xsl:with-param name="line-length" select="66" />
       <xsl:with-param name="text">
-        <xsl:text>        </xsl:text>
+        <xsl:text>    </xsl:text>
         <xsl:if test="key('bison:ruleByLhs', @name)">
           <xsl:text>on@left:</xsl:text>
           <xsl:for-each select="key('bison:ruleByLhs', @name)">
@@ -181,7 +173,7 @@
         </xsl:if>
         <xsl:if test="key('bison:ruleByRhs', @name)">
           <xsl:if test="key('bison:ruleByLhs', @name)">
-            <xsl:text>&#10;        </xsl:text>
+            <xsl:text>, </xsl:text>
           </xsl:if>
           <xsl:text>on@right:</xsl:text>
           <xsl:for-each select="key('bison:ruleByRhs', @name)">
@@ -308,7 +300,7 @@
       name="prev-lhs"
       select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
    />
-    <xsl:with-param name="dot" select="@dot"/>
+    <xsl:with-param name="point" select="@point"/>
     <xsl:with-param name="lookaheads">
       <xsl:apply-templates select="lookaheads"/>
     </xsl:with-param>
@@ -319,7 +311,7 @@
   <xsl:param name="itemset"/>
   <xsl:param name="pad"/>
   <xsl:param name="prev-lhs"/>
-  <xsl:param name="dot"/>
+  <xsl:param name="point"/>
   <xsl:param name="lookaheads"/>
 
   <xsl:if test="$itemset != 'true' and not($prev-lhs = lhs[text()])">
@@ -355,12 +347,12 @@
 
   <!-- RHS -->
   <xsl:for-each select="rhs/*">
-    <xsl:if test="position() = $dot + 1">
-      <xsl:text> •</xsl:text>
+    <xsl:if test="position() = $point + 1">
+      <xsl:text> .</xsl:text>
     </xsl:if>
     <xsl:apply-templates select="."/>
-    <xsl:if test="position() = last() and position() = $dot">
-      <xsl:text> •</xsl:text>
+    <xsl:if test="position() = last() and position() = $point">
+      <xsl:text> .</xsl:text>
     </xsl:if>
   </xsl:for-each>
   <xsl:if test="$lookaheads">

data/xslt/xml2xhtml.xsl

@@ -3,7 +3,7 @@
 <!--
     xml2html.xsl - transform Bison XML Report into XHTML.
 
-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018 Free Software Foundation, Inc.
 
     This file is part of Bison, the GNU Compiler Compiler.
 
@@ -75,7 +75,7 @@
       ol.lower-alpha {
         list-style-type: lower-alpha;
       }
-      .dot {
+      .point {
         color: #cc0000;
       }
       #footer {
@@ -227,7 +227,6 @@
   <xsl:text>&#10;</xsl:text>
   <p class="pre">
     <xsl:call-template name="style-rule-set">
-      <xsl:with-param name="anchor" select="'true'" />
       <xsl:with-param
         name="rule-set" select="rules/rule[@usefulness!='useless-in-grammar']"
       />
@@ -239,11 +238,9 @@
 </xsl:template>
 
 <xsl:template name="style-rule-set">
-  <xsl:param name="anchor"/>
   <xsl:param name="rule-set"/>
   <xsl:for-each select="$rule-set">
     <xsl:apply-templates select=".">
-      <xsl:with-param name="anchor" select="$anchor"/>
       <xsl:with-param name="pad" select="'3'"/>
       <xsl:with-param name="prev-lhs">
         <xsl:if test="position()>1">
@@ -309,10 +306,9 @@
     <xsl:text> Terminals, with rules where they appear</xsl:text>
   </h3>
   <xsl:text>&#10;&#10;</xsl:text>
-  <ul>
-    <xsl:text>&#10;</xsl:text>
+  <p class="pre">
     <xsl:apply-templates select="terminal"/>
-  </ul>
+  </p>
   <xsl:text>&#10;&#10;</xsl:text>
 </xsl:template>
 
@@ -322,64 +318,41 @@
     <xsl:text> Nonterminals, with rules where they appear</xsl:text>
   </h3>
   <xsl:text>&#10;&#10;</xsl:text>
-  <ul>
-    <xsl:text>&#10;</xsl:text>
+  <p class="pre">
     <xsl:apply-templates
       select="nonterminal[@usefulness!='useless-in-grammar']"
     />
-  </ul>
+  </p>
 </xsl:template>
 
 <xsl:template match="terminal">
-  <xsl:text>  </xsl:text>
-  <li>
-    <b><xsl:value-of select="@name"/></b>
-    <xsl:if test="string-length(@type) != 0">
-      <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
-    </xsl:if>
-    <xsl:value-of select="concat(' (', @token-number, ')')"/>
-    <xsl:for-each select="key('bison:ruleByRhs', @name)">
-      <xsl:apply-templates select="." mode="number-link"/>
-    </xsl:for-each>
-  </li>
+  <b><xsl:value-of select="@name"/></b>
+  <xsl:value-of select="concat(' (', @token-number, ')')"/>
+  <xsl:for-each select="key('bison:ruleByRhs', @name)">
+    <xsl:apply-templates select="." mode="number-link"/>
+  </xsl:for-each>
   <xsl:text>&#10;</xsl:text>
 </xsl:template>
 
 <xsl:template match="nonterminal">
-  <xsl:text>  </xsl:text>
-  <li>
-    <b><xsl:value-of select="@name"/></b>
-    <xsl:if test="string-length(@type) != 0">
-      <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
+  <b><xsl:value-of select="@name"/></b>
+  <xsl:value-of select="concat(' (', @symbol-number, ')')"/>
+  <xsl:text>&#10;    </xsl:text>
+  <xsl:if test="key('bison:ruleByLhs', @name)">
+    <xsl:text>on left:</xsl:text>
+    <xsl:for-each select="key('bison:ruleByLhs', @name)">
+      <xsl:apply-templates select="." mode="number-link"/>
+    </xsl:for-each>
+  </xsl:if>
+  <xsl:if test="key('bison:ruleByRhs', @name)">
+    <xsl:if test="key('bison:ruleByLhs', @name)">
+      <xsl:text>&#10;    </xsl:text>
     </xsl:if>
-    <xsl:value-of select="concat(' (', @symbol-number, ')')"/>
-    <xsl:text>&#10;    </xsl:text>
-    <ul>
-      <xsl:text>&#10;</xsl:text>
-      <xsl:if test="key('bison:ruleByLhs', @name)">
-        <xsl:text>      </xsl:text>
-        <li>
-          <xsl:text>on left:</xsl:text>
-          <xsl:for-each select="key('bison:ruleByLhs', @name)">
-            <xsl:apply-templates select="." mode="number-link"/>
-          </xsl:for-each>
-        </li>
-        <xsl:text>&#10;</xsl:text>
-      </xsl:if>
-      <xsl:if test="key('bison:ruleByRhs', @name)">
-        <xsl:text>      </xsl:text>
-        <li>
-          <xsl:text>on right:</xsl:text>
-          <xsl:for-each select="key('bison:ruleByRhs', @name)">
-            <xsl:apply-templates select="." mode="number-link"/>
-          </xsl:for-each>
-        </li>
-        <xsl:text>&#10;</xsl:text>
-      </xsl:if>
-    <xsl:text>    </xsl:text>
-    </ul>
-    <xsl:text>&#10;  </xsl:text>
-  </li>
+    <xsl:text>on right:</xsl:text>
+    <xsl:for-each select="key('bison:ruleByRhs', @name)">
+      <xsl:apply-templates select="." mode="number-link"/>
+    </xsl:for-each>
+  </xsl:if>
   <xsl:text>&#10;</xsl:text>
 </xsl:template>
 
@@ -412,7 +385,7 @@
         <xsl:value-of select="concat('state_', @number)"/>
       </xsl:attribute>
     </a>
-    <xsl:text>State </xsl:text>
+    <xsl:text>state </xsl:text>
     <xsl:value-of select="@number"/>
   </h3>
   <xsl:text>&#10;&#10;</xsl:text>
@@ -484,44 +457,35 @@
     <xsl:with-param name="prev-lhs"
       select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
    />
-    <xsl:with-param name="dot" select="@dot"/>
+    <xsl:with-param name="point" select="@point"/>
     <xsl:with-param name="lookaheads">
       <xsl:apply-templates select="lookaheads"/>
     </xsl:with-param>
   </xsl:apply-templates>
 </xsl:template>
 
-<!--
-anchor = 'true': define as an <a> anchor.
-itemset = 'true': show the items.
- -->
 <xsl:template match="rule">
-  <xsl:param name="anchor"/>
   <xsl:param name="itemset"/>
   <xsl:param name="pad"/>
   <xsl:param name="prev-lhs"/>
-  <xsl:param name="dot"/>
+  <xsl:param name="point"/>
   <xsl:param name="lookaheads"/>
 
   <xsl:if test="$itemset != 'true' and not($prev-lhs = lhs[text()])">
     <xsl:text>&#10;</xsl:text>
   </xsl:if>
 
+  <xsl:if test="$itemset != 'true'">
+    <a>
+      <xsl:attribute name="name">
+        <xsl:value-of select="concat('rule_', @number)"/>
+      </xsl:attribute>
+    </a>
+  </xsl:if>
   <xsl:text>  </xsl:text>
 
   <xsl:choose>
-    <xsl:when test="$anchor = 'true'">
-      <a>
-        <xsl:attribute name="name">
-          <xsl:value-of select="concat('rule_', @number)"/>
-        </xsl:attribute>
-        <xsl:call-template name="lpad">
-          <xsl:with-param name="str" select="string(@number)"/>
-          <xsl:with-param name="pad" select="number($pad)"/>
-        </xsl:call-template>
-      </a>
-    </xsl:when>
-    <xsl:otherwise>
+    <xsl:when test="$itemset = 'true'">
       <a>
         <xsl:attribute name="href">
           <xsl:value-of select="concat('#rule_', @number)"/>
@@ -531,13 +495,25 @@ itemset = 'true': show the items.
           <xsl:with-param name="pad" select="number($pad)"/>
         </xsl:call-template>
       </a>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="string(@number)"/>
+        <xsl:with-param name="pad" select="number($pad)"/>
+      </xsl:call-template>
     </xsl:otherwise>
   </xsl:choose>
   <xsl:text> </xsl:text>
 
   <!-- LHS -->
   <xsl:choose>
-    <xsl:when test="$prev-lhs = lhs[text()]">
+    <xsl:when test="$itemset != 'true' and $prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:when test="$itemset = 'true' and $prev-lhs = lhs[text()]">
       <xsl:call-template name="lpad">
         <xsl:with-param name="str" select="'|'"/>
         <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
@@ -553,14 +529,14 @@ itemset = 'true': show the items.
 
   <!-- RHS -->
   <xsl:for-each select="rhs/*">
-    <xsl:if test="position() = $dot + 1">
+    <xsl:if test="position() = $point + 1">
       <xsl:text> </xsl:text>
-      <span class="dot">&#x2022;</span>
+      <span class="point">.</span>
     </xsl:if>
     <xsl:apply-templates select="."/>
-    <xsl:if test="position() = last() and position() = $dot">
+    <xsl:if test="position() = last() and position() = $point">
       <xsl:text> </xsl:text>
-      <span class="dot">&#x2022;</span>
+      <span class="point">.</span>
     </xsl:if>
   </xsl:for-each>
   <xsl:if test="$lookaheads">

djgpp/Makefile.maint

@@ -0,0 +1,37 @@
+# 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

@@ -0,0 +1,195 @@
+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

@@ -0,0 +1,547 @@
+@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

@@ -0,0 +1,190 @@
+# 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

@@ -0,0 +1,85 @@
+#! /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/config_h.sed

@@ -1,7 +1,7 @@
-#! /bin/sh
+# sed script for DJGPP specific editing of config.hin
+
+# Copyright (C) 2005-2015, 2018 Free Software Foundation, Inc.
 
-# 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
@@ -15,29 +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/>.
 
-cat >input <<EOF
-1+2*3
-EOF
-run 0 7
 
-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
-# Check the traces.
-run -noerr 0 9 -p
-
-cat >input <<EOF
-1++2
-EOF
-run 0 "err: syntax error, unexpected '+', expecting number or '('"
+$ a\
+\
+\
+/* DJGPP specific defines.  */\
+\
+#include <unistd.h>\
+#define TAB_EXT     ((pathconf(NULL, _PC_NAME_MAX) > 12) ? ".tab" : "_tab")\
+#define OUTPUT_EXT  ((pathconf(NULL, _PC_NAME_MAX) > 12) ? ".output" : ".out")\
+\
+#define DEFAULT_TMPDIR  "/dev/env/DJDIR/tmp"

djgpp/djunpack.bat

@@ -0,0 +1,87 @@
+@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

@@ -0,0 +1,27 @@
+@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/local.mk

@@ -1,5 +1,5 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
-##
+## Copyright (C) 2008-2015, 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
@@ -13,13 +13,15 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-cdir = $(docdir)/%D%
-dist_c_DATA = %D%/README.md
-
-include %D%/bistromathic/local.mk
-include %D%/calc/local.mk
-include %D%/lexcalc/local.mk
-include %D%/mfcalc/local.mk
-include %D%/pushcalc/local.mk
-include %D%/reccalc/local.mk
-include %D%/rpcalc/local.mk
+EXTRA_DIST +=					\
+  djgpp/Makefile.maint				\
+  djgpp/README.in				\
+  djgpp/config.bat				\
+  djgpp/config.sed				\
+  djgpp/config.site				\
+  djgpp/config_h.sed				\
+  djgpp/djunpack.bat				\
+  djgpp/fnchange.lst				\
+  djgpp/subpipe.c				\
+  djgpp/subpipe.h				\
+  djgpp/testsuite.sed

djgpp/subpipe.c

@@ -0,0 +1,293 @@
+/* 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

@@ -0,0 +1,27 @@
+/* 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 *);

djgpp/testsuite.sed

@@ -1,42 +1,23 @@
-#! /bin/sh
-
-# Copyright (C) 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/>.
-
-cat >input <<EOF
-1+2*3
-EOF
-run 0 7
-
-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
-
-cat >input <<EOF
-1++2
-EOF
-run 0 "err: syntax error, unexpected '+', expecting number or '('"
+# DJGPP specific configuration file.
+# Sed script for additional DJGPP specific editing
+# of the testsuite script generated by autoconf 2.61.
+
+# 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
+# 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/>.
+
+
+# Remove disallowed characters from file names.
+
+s/~!@#\\\$%^&\*()-=_+{}\[\]|\\\\:;<>, ./~!@#\\$%^\&()-=_+{}[];, ./g

doc/.gitignore

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

doc/calc.y

@@ -1,23 +0,0 @@
-%union
-{
-  int ival;
-  const char *sval;
-}
-
-%token <ival> NUM
-%nterm <ival> exp
-%token <sval> STR
-%nterm <sval> useless
-
-%left '+' '-'
-%left '*'
-
-%%
-exp:
-  exp '+' exp
-| exp '-' exp
-| exp '*' exp
-| exp '/' exp
-| NUM
-;
-useless: STR;

doc/figs/example-reduce.gv

@@ -3,7 +3,7 @@ digraph "reduce.y"
   node [fontname=courier shape=box]
   edge [fontname=courier]
 
-  1 [label="State 1\n  3 a: \"0\" •  [\".\"]\l  4 b: \"0\" •  [\";\"]\l"]
+  1 [label="State 1\n  3 a: \"0\" .  [\".\"]\l  4 b: \"0\" .  [\";\"]\l"]
   1 -> "1R3" [label="" style=solid]
  "1R3" [style=filled shape=diamond fillcolor=yellowgreen label="R3"]
   1 -> "1R4" [label="[\";\"]" style=solid]

doc/figs/example-reduce.txt

@@ -1,7 +1,7 @@
        .------------------.
        |     State 1      |
-       | 3 a: "0" • [";"] |
-       | 4 b: "0" • ["."] |
+       | 3 a: "0" . [";"] |
+       | 4 b: "0" . ["."] |
        `------------------'
              /     \
             /       \ ["."]

doc/figs/example-shift.gv

@@ -3,7 +3,7 @@ digraph "shift.y"
   node [fontname=courier shape=box]
   edge [fontname=courier]
 
-  3 [label="State 3\n  1 exp: a • \".\"\l"]
+  3 [label="State 3\n  1 exp: a . \".\"\l"]
   3 -> 6 [style=solid label="\".\""]
-  6 [label="State 6\n  1 exp: a \".\" •\l"]
+  6 [label="State 6\n  1 exp: a \".\" .\l"]
 }

doc/figs/example-shift.txt

@@ -1,6 +1,6 @@
 .----------------.
 |    State 3     |
-| 1 exp: a • ";" |
+| 1 exp: a . ";" |
 `----------------'
         |
         | ";"
@@ -8,5 +8,5 @@
         v
 .----------------.
 |    State 6     |
-| 1 exp: a ";" • |
+| 1 exp: a ";" . |
 `----------------'

doc/figs/example.gv

@@ -2,34 +2,34 @@
 // Report bugs to <[email protected]>.
 // Home page: <http://www.gnu.org/software/bison/>.
 
-digraph "example.y"
+digraph "/tmp/fo.y"
 {
   node [fontname = courier, shape = box, colorscheme = paired6]
   edge [fontname = courier]
 
-  0 [label="State 0\n\l  0 $accept: • exp $end\l  1 exp: • a \";\"\l  2    | • b \".\"\l  3 a: • \"0\"\l  4 b: • \"0\"\l"]
+  0 [label="State 0\n\l  0 $accept: . exp $end\l  1 exp: . a \";\"\l  2    | . b \".\"\l  3 a: . \"0\"\l  4 b: . \"0\"\l"]
   0 -> 1 [style=solid label="\"0\""]
   0 -> 2 [style=dashed label="exp"]
   0 -> 3 [style=dashed label="a"]
   0 -> 4 [style=dashed label="b"]
-  1 [label="State 1\n\l  3 a: \"0\" •  [\";\"]\l  4 b: \"0\" •  [\".\"]\l"]
+  1 [label="State 1\n\l  3 a: \"0\" .  [\";\"]\l  4 b: \"0\" .  [\".\"]\l"]
   1 -> "1R3" [style=solid]
  "1R3" [label="R3", fillcolor=3, shape=diamond, style=filled]
   1 -> "1R4" [label="[\".\"]", style=solid]
  "1R4" [label="R4", fillcolor=3, shape=diamond, style=filled]
-  2 [label="State 2\n\l  0 $accept: exp • $end\l"]
+  2 [label="State 2\n\l  0 $accept: exp . $end\l"]
   2 -> 5 [style=solid label="$end"]
-  3 [label="State 3\n\l  1 exp: a • \";\"\l"]
+  3 [label="State 3\n\l  1 exp: a . \";\"\l"]
   3 -> 6 [style=solid label="\";\""]
-  4 [label="State 4\n\l  2 exp: b • \".\"\l"]
+  4 [label="State 4\n\l  2 exp: b . \".\"\l"]
   4 -> 7 [style=solid label="\".\""]
-  5 [label="State 5\n\l  0 $accept: exp $end •\l"]
+  5 [label="State 5\n\l  0 $accept: exp $end .\l"]
   5 -> "5R0" [style=solid]
  "5R0" [label="Acc", fillcolor=1, shape=diamond, style=filled]
-  6 [label="State 6\n\l  1 exp: a \";\" •\l"]
+  6 [label="State 6\n\l  1 exp: a \";\" .\l"]
   6 -> "6R1" [style=solid]
  "6R1" [label="R1", fillcolor=3, shape=diamond, style=filled]
-  7 [label="State 7\n\l  2 exp: b \".\" •\l"]
+  7 [label="State 7\n\l  2 exp: b \".\" .\l"]
   7 -> "7R2" [style=solid]
  "7R2" [label="R2", fillcolor=3, shape=diamond, style=filled]
 }

doc/ids.y

@@ -1,5 +0,0 @@
-%token ID
-%%
-s: a ID
-a: expr
-expr: %empty | expr ID ','

doc/if-then-else.y

@@ -1,13 +0,0 @@
-%%
-stmt:
-  expr
-| if_stmt
-;
-
-if_stmt:
-  "if" expr "then" stmt
-| "if" expr "then" stmt "else" stmt
-;
-
-expr:
-  "identifier"

doc/local.mk

@@ -1,5 +1,5 @@
-## Copyright (C) 2001-2003, 2005-2015, 2018-2020 Free Software
-## Foundation, Inc.
+## Copyright (C) 2001-2003, 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
@@ -14,77 +14,54 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-AM_MAKEINFOFLAGS =                                              \
-  --no-split                                                    \
-  --set-customization-variable=SECTION_NAME_IN_TITLE=true       \
-  --set-customization-variable=AVOID_MENU_REDUNDANCY=true       \
-  --set-customization-variable=ICONS=true
-
-info_TEXINFOS = %D%/bison.texi
-%C%_bison_TEXINFOS =                            \
+AM_MAKEINFOFLAGS = --no-split
+info_TEXINFOS = doc/bison.texi
+doc_bison_TEXINFOS =                            \
   $(CROSS_OPTIONS_TEXI)                         \
-  %D%/fdl.texi                                  \
-  %D%/gpl-3.0.texi                              \
-  %D%/relocatable.texi
+  doc/fdl.texi                                  \
+  doc/gpl-3.0.texi
 
 # Cannot express dependencies directly on file names because of Automake.
 # Obfuscate with a variable.
-%C%_bison = %D%/bison
-$(%C%_bison).dvi: $(FIGS_GV:.gv=.eps)
-$(%C%_bison).info: $(FIGS_GV:.gv=.txt)
-$(%C%_bison).pdf: $(FIGS_GV:.gv=.pdf)
-$(%C%_bison).html: $(FIGS_GV:.gv=.svg)
+doc_bison = doc/bison
+$(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)
 
-TEXI2DVI = texi2dvi --build-dir=%D%/bison.t2d -I %D%
-CLEANDIRS += %D%/bison.t2d
+TEXI2DVI = texi2dvi --build-dir=doc/bison.t2d -I doc
+CLEANDIRS += doc/bison.t2d
 
-MOSTLYCLEANFILES += $(top_srcdir)/%D%/*.tmp
+MOSTLYCLEANFILES += $(top_srcdir)/doc/*.tmp
 
 CROSS_OPTIONS_PL = $(top_srcdir)/build-aux/cross-options.pl
-CROSS_OPTIONS_TEXI = $(top_srcdir)/%D%/cross-options.texi
-$(CROSS_OPTIONS_TEXI): %D%/bison.help $(CROSS_OPTIONS_PL)
+CROSS_OPTIONS_TEXI = $(top_srcdir)/doc/cross-options.texi
+$(CROSS_OPTIONS_TEXI): doc/bison.help $(CROSS_OPTIONS_PL)
 # Create $@~ which is the previous contents.  Don't use 'mv' here so
 # that even if we are interrupted, the file is still available for
 # diff in the next run.  Note that $@ might not exist yet.
 	$(AM_V_GEN){ test ! -f $@ || cat $@; } >$@~
 	$(AM_V_at)test ! -f $@.tmp || rm -f $@.tmp
 	$(AM_V_at)$(PERL) $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l \
-	  <$(top_srcdir)/%D%/bison.help >$@.tmp
+	  <$(top_srcdir)/doc/bison.help >$@.tmp
 	$(AM_V_at)diff -u $@~ $@.tmp || true
 	$(AM_V_at)mv $@.tmp $@
 MAINTAINERCLEANFILES = $(CROSS_OPTIONS_TEXI)
 
-
-# Fix Info's @code in @deftype
-# https://lists.gnu.org/archive/html/help-texinfo/2019-11/msg00004.html
-all: $(srcdir)/$(%C%_bison).info.bak
-$(srcdir)/$(%C%_bison).info.bak: $(srcdir)/$(%C%_bison).info
-	$(AM_V_GEN) $(PERL) -pi.bak -0777	\
-	  -e 's{(^ --.*\n(?: {10}.*\n)*)}'	\
-	  -e '{'				\
-	  -e '  $$def = $$1;'			\
-	  -e '  $$def =~ s/‘|’//g;'		\
-	  -e '  $$def;'				\
-	  -e '}gem;' $(srcdir)/$(%C%_bison).info
-	@ touch $@
-EXTRA_DIST += $(srcdir)/$(%C%_bison).info.bak
-MAINTAINERCLEANFILES += $(srcdir)/$(%C%_bison).info.bak
-
-
 ## ---------- ##
 ## Ref card.  ##
 ## ---------- ##
 
-EXTRA_DIST += %D%/refcard.tex
-CLEANFILES += %D%/refcard.pdf
+EXTRA_DIST += doc/refcard.tex
+CLEANFILES += doc/refcard.pdf
 
-%D%/refcard.pdf: %D%/refcard.tex
-	$(AM_V_GEN) cd %D% && pdftex $(abs_top_srcdir)/%D%/refcard.tex
+doc/refcard.pdf: doc/refcard.tex
+	$(AM_V_GEN) cd doc && pdftex $(abs_top_srcdir)/doc/refcard.tex
 
 
 
 ## ---------------- ##
-## %D%/bison.help.  ##
+## doc/bison.help.  ##
 ## ---------------- ##
 
 # Some of our targets (cross-options.texi, bison.1) use "bison --help".
@@ -106,19 +83,16 @@ CLEANFILES += %D%/refcard.pdf
 # compilations of cross-options.texi and bison.1.  At the cost of
 # repeated builds of bison.help.
 
-EXTRA_DIST += $(top_srcdir)/%D%/bison.help
+EXTRA_DIST += $(top_srcdir)/doc/bison.help
 if ! CROSS_COMPILING
-MAINTAINERCLEANFILES += $(top_srcdir)/%D%/bison.help
-$(top_srcdir)/%D%/bison.help: src/bison$(EXEEXT)
-	$(AM_V_GEN)$(MKDIR_P) %D%
-	$(AM_V_at) LC_ALL=C tests/bison --version >%D%/bison.help.tmp
-	$(AM_V_at) LC_ALL=C tests/bison --help | \
-## Avoid depending on the path to Bison.
-	  sed -e 's,^Usage: .*/bison \[OPTION\],Usage: bison [OPTION],g' \
+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
+	$(AM_V_at) LC_ALL=C src/bison$(EXEEXT) --help | \
 ## Avoid variations in the output depending on whether we are
 ## on a glibc system.
-	      -e '/translation bugs/d'  >>%D%/bison.help.tmp
-	$(AM_V_at)$(top_srcdir)/build-aux/move-if-change %D%/bison.help.tmp $@
+	  sed '/translation bugs/d'  >>doc/bison.help.tmp
+	$(AM_V_at)$(top_srcdir)/build-aux/move-if-change doc/bison.help.tmp $@
 endif ! CROSS_COMPILING
 
 
@@ -126,62 +100,48 @@ endif ! CROSS_COMPILING
 ## Man Pages.  ##
 ## ----------- ##
 
-dist_man_MANS = $(top_srcdir)/%D%/bison.1
+dist_man_MANS = $(top_srcdir)/doc/bison.1
 
 EXTRA_DIST += $(dist_man_MANS:.1=.x)
 MAINTAINERCLEANFILES += $(dist_man_MANS)
 
-# Differences to ignore when comparing man pages (the date).
+# Differences to ignore when comparing the man page (the date).
 remove_time_stamp = \
   sed 's/^\(\.TH[^"]*"[^"]*"[^"]*\)"[^"]*"/\1/'
 
 # Depend on configure to get version number changes.
 if ! CROSS_COMPILING
-MAN_DEPS = %D%/bison.help %D%/bison.x $(top_srcdir)/configure
+MAN_DEPS = doc/bison.help doc/bison.x $(top_srcdir)/configure
 endif
 
-# If we don't have help2man, just touch the target.  Maintainers must
-# have the real thing, so if there's a .git directory, fail hard.
-#
-# We shouldn't need this, but on some OS the timestamps in the tarball
-# leave us no choice.  See
-# https://lists.gnu.org/r/bug-bison/2020-05/msg00055.html.
-$(top_srcdir)/%D%/bison.1: $(MAN_DEPS)
-	$(AM_V_GEN)if $(HELP2MAN) --version >/dev/null 2>&1; then	\
-	  $(HELP2MAN)							\
-	    --include=$(top_srcdir)/%D%/bison.x				\
-	    --output=$@.tmp tests/bison &&				\
-	  { $(remove_time_stamp) $@     >$@a.tmp || true; } &&		\
-	    $(remove_time_stamp) $@.tmp >$@b.tmp &&			\
-	  if diff $@a.tmp $@b.tmp >/dev/null 2>&1; then			\
-	    touch $@;							\
-	  else								\
-	    mv $@.tmp $@;						\
-	  fi &&								\
-	  rm -f $@*.tmp;						\
-	elif test -d $(srcdir)/.git; then				\
-	  echo >&2 "ERROR: $@: help2man is needed";			\
-	  exit 1;							\
-	else								\
-	  touch $@;							\
+$(top_srcdir)/doc/bison.1: $(MAN_DEPS)
+	$(AM_V_GEN)$(HELP2MAN)			\
+	    --include=$(top_srcdir)/doc/bison.x	\
+	    --output=$@.tmp src/bison$(EXEEXT)
+	$(AM_V_at)if $(remove_time_stamp) $@ >$@a.tmp 2>/dev/null &&		\
+	   $(remove_time_stamp) $@.tmp | cmp $@a.tmp - >/dev/null 2>&1; then	\
+	  touch $@;								\
+	else									\
+	  mv $@.tmp $@;								\
 	fi
+	$(AM_V_at)rm -f $@*.tmp
 
 if ENABLE_YACC
-nodist_man_MANS = %D%/yacc.1
+nodist_man_MANS = doc/yacc.1
 endif
 
 ## ----------------------------- ##
 ## Graphviz examples generation. ##
 ## ----------------------------- ##
 
-CLEANFILES += $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.svg)
+CLEANFILES += $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.png)
 FIGS_GV =                                               \
-  %D%/figs/example.gv                                   \
-  %D%/figs/example-reduce.gv %D%/figs/example-shift.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=.svg)
-SUFFIXES += .gv .eps .pdf .svg
+  $(FIGS_GV:.gv=.eps) $(FIGS_GV:.gv=.pdf) $(FIGS_GV:.gv=.png)
+SUFFIXES += .gv .eps .pdf .png
 
 .gv.eps:
 	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
@@ -193,9 +153,9 @@ SUFFIXES += .gv .eps .pdf .svg
 	$(AM_V_at) $(DOT) -Gmargin=0 -Tpdf $< >$@.tmp
 	$(AM_V_at) mv $@.tmp $@
 
-.gv.svg:
+.gv.png:
 	$(AM_V_GEN) $(MKDIR_P) `echo "./$@" | sed -e 's,/[^/]*$$,,'`
-	$(AM_V_at) $(DOT) -Gmargin=0 -Tsvg $< >$@.tmp
+	$(AM_V_at) $(DOT) -Gmargin=0 -Tpng $< >$@.tmp
 	$(AM_V_at) mv $@.tmp $@
 
 ## -------------- ##
@@ -208,8 +168,8 @@ DOXYGEN = doxygen
 
 doc: html
 
-html-local: %D%/Doxyfile
-	$(AM_V_GEN) $(DOXYGEN) %D%/Doxyfile
+html-local: doc/Doxyfile
+	$(AM_V_GEN) $(DOXYGEN) doc/Doxyfile
 
 edit = sed -e 's,@PACKAGE_NAME\@,$(PACKAGE_NAME),g' \
 	   -e 's,@PACKAGE_VERSION\@,$(PACKAGE_VERSION),g' \
@@ -217,11 +177,11 @@ edit = sed -e 's,@PACKAGE_NAME\@,$(PACKAGE_NAME),g' \
 	   -e 's,@top_builddir\@,$(top_builddir),g' \
 	   -e 's,@top_srcdir\@,$(top_srcdir),g'
 
-EXTRA_DIST += %D%/Doxyfile.in
-CLEANFILES += %D%/Doxyfile
+EXTRA_DIST += doc/Doxyfile.in
+CLEANFILES += doc/Doxyfile
 # Sed is used to generate Doxyfile from Doxyfile.in instead of
 # configure, because the former is way faster than the latter.
-%D%/Doxyfile: $(top_srcdir)/%D%/Doxyfile.in
-	$(AM_V_GEN) $(edit) $(top_srcdir)/%D%/Doxyfile.in >%D%/Doxyfile
+doc/Doxyfile: $(top_srcdir)/doc/Doxyfile.in
+	$(AM_V_GEN) $(edit) $(top_srcdir)/doc/Doxyfile.in >doc/Doxyfile
 
-CLEANDIRS += %D%/html
+CLEANDIRS += doc/html

doc/refcard.tex

@@ -19,8 +19,8 @@
 \def\finalout{\overfullrule=0pt}
 %\finalout
 
-% Copyright (c) 1998, 2001, 2009--2015, 2018--2020 Free Software
-% Foundation, Inc.
+% Copyright (c) 1998, 2001, 2009-2015, 2018 Free Software 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 nonterminal} symbol name, and {\it association} can be one of
+{\it non-terminal} 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
-     nonterminal : {\it statement} 1
-                 | {\it statement} 2
-                     \vdots
-                 | {\it statement n}
-                 ;
+     non-terminal : {\it statement} 1
+                  | {\it statement} 2
+                      \vdots
+                  | {\it statement n}
+                  ;
 \endexample
 
 Where {\it statements} can be either empty, or contain
 a mixture of C code (enclosed in {\tt \{...\}}), and the
-symbols that make up the nonterminal. For example:
+symbols that make up the non-terminal. For example:
 
 \vskip -\baselineskip
 \beginexample

doc/sequence.y

@@ -1,10 +0,0 @@
-%%
-sequence:
-  %empty
-| maybeword
-| sequence "word"
-;
-maybeword:
-  %empty
-| "word"
-;

etc/README

@@ -0,0 +1,38 @@
+* bench.pl
+A primitive Perl script to run benches.  Currently its only bench is
+the usual calculator: it has a lightweight processing part (but not
+null), so it is really emphasizing the cost of the whole parsing
+(including scanning and I/O).
+
+Set the envvars BISON and CC to the programs and flags you want to
+use.  They default to bison and gcc.  To run a non-installed bison
+from a tarball built in _build, I suggest the following.
+
+     BISON=_build/tests/bison CC='gcc -O2' ./bench.pl
+
+(The _build/tests/bison wrapper makes sure that _build/src/bison will
+use the tarballs' skeletons, not those already installed as a
+straightforward use of _build/src/bison would.)
+
+--
+
+Copyright (C) 2006, 2009-2015, 2018 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/>.
+
+Local Variables:
+mode: outline
+End:

etc/README.md

@@ -1,36 +0,0 @@
-# bench.pl
-A primitive Perl script to run benches.  Currently its only bench is the
-usual calculator: it has a lightweight processing part (but not null), so it
-is really emphasizing the cost of the whole parsing (including scanning and
-I/O).
-
-Set the envvars `BISON` and `CC` to the programs and flags you want to use.
-They default to `bison` and `gcc`.  To run a non-installed bison from a
-tarball built in _build, I suggest the following.
-
-    BISON=_build/tests/bison CC='gcc -O2' ./bench.pl
-
-(The `_build/tests/bison` wrapper makes sure that `_build/src/bison` will
-use the tarballs' skeletons, not those already installed as a
-straightforward use of `_build/src/bison` would.)
-
-<!--
-
-Local Variables:
-mode: markdown
-fill-column: 76
-ispell-dictionary: "american"
-End:
-
-Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation, Inc.
-
-This file is part of Bison, the GNU Compiler Compiler.
-
-Permission is granted to copy, distribute and/or modify this document
-under the terms of the GNU Free Documentation License, Version 1.3 or
-any later version published by the Free Software Foundation; with no
-Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
-Texts.  A copy of the license is included in the "GNU Free
-Documentation License" file as part of this distribution.
-
--->

etc/local.mk

@@ -1,5 +1,4 @@
-## Copyright (C) 2006, 2008-2015, 2018-2020 Free Software Foundation,
-## Inc.
+## Copyright (C) 2006, 2008-2015, 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
@@ -14,5 +13,4 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-dist_noinst_DATA = %D%/README.md
-nodist_noinst_SCRIPTS = %D%/bench.pl
+nodist_noinst_SCRIPTS = etc/bench.pl

examples/README

@@ -0,0 +1,54 @@
+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

@@ -1,28 +0,0 @@
-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

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

examples/c++/README

@@ -1,52 +1,41 @@
-# Examples in C++
-
 This directory contains examples of Bison grammar files in C++.
 
+* Examples 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 kind and effective
+constructors ensure consistency between declared token type and effective
 semantic value.
 
 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).
+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) 2018-2020 Free Software Foundation, Inc.
+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
@@ -55,5 +44,4 @@ 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 ispell american
---->
+# LocalWords:  mfcalc calc parsers yy ispell american

examples/c++/calc++/Makefile

@@ -1,41 +0,0 @@
-# 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

@@ -1,49 +0,0 @@
-# calc++ - A Flex+Bison calculator
-
-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](https://www.gnu.org/software/bison/manual/html_node/A-Complete-C_002b_002b-Example.html)
-(maybe with a different version of Bison).
-
-To use it, copy this directory into some work directory, and run `make` to
-compile the executable, and try it.  It is a simple calculator which accepts
-several variable definitions, one per line, and then a single expression to
-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
-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:
-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:  calc parsers yy MERCHANTABILITY Ctrl ispell american
---->

examples/c++/local.mk

@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 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
@@ -13,8 +13,7 @@
 ## You should have received a copy of the GNU General Public License
 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-cxxdir = $(docdir)/%D%
-include %D%/calc++/local.mk
+cxxdir = $(examplesdir)/c++
 
 ## -------- ##
 ## Simple.  ##
@@ -37,7 +36,7 @@ if ENABLE_CXX14
   # Don't use gnulib's system headers.
   %C%_simple_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/simple.test
-  %D%/simple.cc: $(dependencies)
+  %D%/simple.cc: $(BISON_IN) $(dist_pkgdata_DATA)
 endif
 EXTRA_DIST += %D%/simple.test
 
@@ -52,7 +51,7 @@ if ENABLE_CXX
   # Don't use gnulib's system headers.
   %C%_variant_CPPFLAGS = -I$(top_builddir)
   TESTS += %D%/variant.test
-  %D%/variant.cc: $(dependencies)
+  %D%/variant.cc: $(BISON_IN) $(dist_pkgdata_DATA)
 endif
 EXTRA_DIST += %D%/variant.test
 
@@ -63,11 +62,9 @@ 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: $(dependencies)
+  %D%/variant-11.cc: $(BISON_IN) $(dist_pkgdata_DATA)
 endif
 EXTRA_DIST += %D%/variant-11.test
 
-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    \
-  %D%/simple.hh %D%/variant.hh %D%/variant-11.hh
+dist_cxx_DATA = %D%/README %D%/Makefile %D%/variant.yy %D%/variant-11.yy
+CLEANFILES += %D%/simple.output %D%/variant.output %D%/variant-11.output

examples/c++/variant-11.test

@@ -1,6 +1,6 @@
 #! /bin/sh
 
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 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

examples/c++/variant-11.yy

@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+  Copyright (C) 2008-2015, 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
@@ -117,7 +117,7 @@ namespace yy
     static int count = 0;
     const int stage = count;
     ++count;
-    auto loc = parser::location_type{nullptr, stage + 1, stage + 1};
+    auto loc = parser::location_type{nullptr, unsigned (stage + 1), unsigned (stage + 1)};
     if (stage == 0)
       return parser::make_TEXT (make_string_uptr ("I have numbers for you."), std::move (loc));
     else if (stage < max)
@@ -139,7 +139,7 @@ namespace yy
 int
 main (int argc, const char *argv[])
 {
-  if (2 <= argc && isdigit (static_cast<unsigned char> (*argv[1])))
+  if (2 <= argc && isdigit (*argv[1]))
     {
       auto maxl = strtol (argv[1], nullptr, 10);
       max = INT_MIN <= maxl && maxl <= INT_MAX ? int(maxl) : 4;