t/flex.sh

   1 #!/bin/sh
   2 #
   3 # Copyright © 2020 Nick Bowler
   4 #
   5 # Fake flex program for testing the flex 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_FLEX_VERSION=2.0.0}"
  12
  13 argv0=$0
  14
  15 infile=
  16 outfile=lex.yy.c
  17 for arg
  18 do
  19   shift
  20
  21   case $arg in
  22   -o) outfile=$1; shift ;;
  23   *) set x "$@" "$arg"; shift ;;
  24   esac
  25 done
  26
  27 for arg
  28 do
  29   case $arg in
  30   *.l) infile=$arg ;;
  31   esac
  32 done
  33
  34 if test x"$infile" = x""; then
  35   printf '%s: error: no input file\n' "$argv0" 1>&2
  36   exit 1
  37 fi
  38
  39 copyout=false
  40 exec 3<"$infile" 4>"$outfile"
  41
  42 save_IFS=$IFS IFS=.
  43 set x $FAKE_FLEX_VERSION 0 0 0; shift
  44 IFS=$save_IFS
  45
  46 cat >&4 <<EOF
  47 #define FLEX_SCANNER
  48 #define YY_FLEX_MAJOR_VERSION $1
  49 #define YY_FLEX_MINOR_VERSION $2
  50 #define YY_FLEX_SUBMINOR_VERSION $3
  51 EOF
  52
  53 while read line <&3; do
  54   case $line in
  55   %{) copyout=true ;;
  56   %}) copyout=false ;;
  57   %%) break ;;
  58   *) $copyout && printf '%s\n' "$line" >&4 ;;
  59   esac
  60 done
  61
  62 cat >&4 <<EOF
  63 int yylex(void)
  64 {
  65   return 0;
  66 }
  67 EOF
  68
  69 while read line <&3; do
  70   case $line in
  71   %%) break ;;
  72   esac
  73 done
  74
  75 cat <&3 >&4