t/bison.sh

   1 #!/bin/sh
   2 #
   3 # Copyright © 2021 Nick Bowler
   4 #
   5 # Fake bison program for testing the bison detection macro.
   6 #
   7 # License WTFPL2: Do What The Fuck You Want To Public License, version 2.
   8 # This is free software: you are free to do what the fuck you want to.
   9 # There is NO WARRANTY, to the extent permitted by law.
  10
  11 : "${FAKE_BISON_VERSION=2.4.0}"
  12
  13 argv0=$0
  14
  15 infile=
  16 outheader=
  17 use_header=false
  18
  19 for arg
  20 do
  21   case $arg in
  22   --defines) use_header=true ;;
  23   --defines=*) use_header=true outheader=${arg%*=} ;;
  24   *.y) infile=$arg ;;
  25   esac
  26 done
  27
  28 if test x"$infile" = x""; then
  29   printf '%s: error: no input file\n' "$argv0" 1>&2
  30   exit 1
  31 fi
  32
  33 outfile=${infile%.y}.tab.c
  34 if $use_header; then
  35   test ${outheader:+y} || outheader=${outfile%.c}.h
  36   exec 5>"$outheader"
  37 fi
  38 exec 3<"$infile" 4>"$outfile"
  39
  40 copy_header=false copy_impl=false
  41 while read line <&3; do
  42   case $line in
  43   %require*)
  44     save_IFS=$IFS IFS=$IFS\".
  45     set x $FAKE_BISON_VERSION 0 0 0; shift
  46     fake_major=$1 fake_minor=$2 fake_revision=$3
  47     set x ${line#*\"} 0 0 0; shift
  48     req_major=$1 req_minor=$2 req_revision=$3
  49     IFS=$save_IFS
  50     set -x
  51     test $fake_major -ge $req_major || exit 1
  52     if test $fake_major -eq $req_major; then
  53       test $fake_minor -ge $req_minor || exit 1
  54       if test $fake_minor -eq $req_minor; then
  55         test $fake_revision -ge $req_revision || exit 1
  56       fi
  57     fi
  58     set +x
  59     ;;
  60   %code*)
  61     set x $line; shift
  62     case $2 in
  63     requires|provides) copy_header=true copy_impl=true ;;
  64     top) copy_impl=true ;;
  65     esac
  66     ;;
  67   [}])
  68     copy_header=false copy_impl=false
  69     ;;
  70   %%)
  71     break
  72     ;;
  73   *)
  74     $copy_header && printf '%s\n' "$line" >&5
  75     $copy_impl && printf '%s\n' "$line" >&4
  76     ;;
  77   esac
  78 done
  79
  80 cat >&4 <<EOF
  81 int yyparse(void)
  82 {
  83   return 0;
  84 }
  85 EOF
  86
  87 while read line <&3; do
  88   case $line in
  89   %%) break;
  90   esac
  91 done
  92
  93 cat <&3 >&4