ylwrap

   1 #! /bin/sh
   2 # ylwrap - wrapper for lex/yacc invocations.
   3
   4 scriptversion=2013-01-12.17; # UTC
   5
   6 # Copyright (C) 1996-2014 Free Software Foundation, Inc.
   7 #
   8 # Written by Tom Tromey <tromey@cygnus.com>.
   9 #
  10 # This program is free software; you can redistribute it and/or modify
  11 # it under the terms of the GNU General Public License as published by
  12 # the Free Software Foundation; either version 2, or (at your option)
  13 # any later version.
  14 #
  15 # This program is distributed in the hope that it will be useful,
  16 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 # GNU General Public License for more details.
  19 #
  20 # You should have received a copy of the GNU General Public License
  21 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 # As a special exception to the GNU General Public License, if you
  24 # distribute this file as part of a program that contains a
  25 # configuration script generated by Autoconf, you may include it under
  26 # the same distribution terms that you use for the rest of that program.
  27
  28 # This file is maintained in Automake, please report
  29 # bugs to <bug-automake@gnu.org> or send patches to
  30 # <automake-patches@gnu.org>.
  31
  32 get_dirname ()
  33 {
  34   case $1 in
  35     */*|*\\*) printf '%s\n' "$1" | sed -e 's|\([\\/]\)[^\\/]*$|\1|';;
  36     # Otherwise,  we want the empty string (not ".").
  37   esac
  38 }
  39
  40 # guard FILE
  41 # ----------
  42 # The CPP macro used to guard inclusion of FILE.
  43 guard ()
  44 {
  45   printf '%s\n' "$1"                                                    \
  46     | sed                                                               \
  47         -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'   \
  48         -e 's/[^ABCDEFGHIJKLMNOPQRSTUVWXYZ]/_/g'                        \
  49         -e 's/__*/_/g'
  50 }
  51
  52 # quote_for_sed [STRING]
  53 # ----------------------
  54 # Return STRING (or stdin) quoted to be used as a sed pattern.
  55 quote_for_sed ()
  56 {
  57   case $# in
  58     0) cat;;
  59     1) printf '%s\n' "$1";;
  60   esac \
  61     | sed -e 's|[][\\.*]|\\&|g'
  62 }
  63
  64 case "$1" in
  65   '')
  66     echo "$0: No files given.  Try '$0 --help' for more information." 1>&2
  67     exit 1
  68     ;;
  69   --basedir)
  70     basedir=$2
  71     shift 2
  72     ;;
  73   -h|--h*)
  74     cat <<\EOF
  75 Usage: ylwrap [--help|--version] INPUT [OUTPUT DESIRED]... -- PROGRAM [ARGS]...
  76
  77 Wrapper for lex/yacc invocations, renaming files as desired.
  78
  79   INPUT is the input file
  80   OUTPUT is one file PROG generates
  81   DESIRED is the file we actually want instead of OUTPUT
  82   PROGRAM is program to run
  83   ARGS are passed to PROG
  84
  85 Any number of OUTPUT,DESIRED pairs may be used.
  86
  87 Report bugs to <bug-automake@gnu.org>.
  88 EOF
  89     exit $?
  90     ;;
  91   -v|--v*)
  92     echo "ylwrap $scriptversion"
  93     exit $?
  94     ;;
  95 esac
  96
  97
  98 # The input.
  99 input=$1
 100 shift
 101 # We'll later need for a correct munging of "#line" directives.
 102 input_sub_rx=`get_dirname "$input" | quote_for_sed`
 103 case $input in
 104   [\\/]* | ?:[\\/]*)
 105     # Absolute path; do nothing.
 106     ;;
 107   *)
 108     # Relative path.  Make it absolute.
 109     input=`pwd`/$input
 110     ;;
 111 esac
 112 input_rx=`get_dirname "$input" | quote_for_sed`
 113
 114 # The parser itself, the first file, is the destination of the .y.c
 115 # rule in the Makefile.
 116 parser=$1
 117
 118 # A sed program to s/FROM/TO/g for all the FROM/TO so that, for
 119 # instance, we rename #include "y.tab.h" into #include "parse.h"
 120 # during the conversion from y.tab.c to parse.c.
 121 sed_fix_filenames=
 122
 123 # Also rename header guards, as Bison 2.7 for instance uses its header
 124 # guard in its implementation file.
 125 sed_fix_header_guards=
 126
 127 while test $# -ne 0; do
 128   if test x"$1" = x"--"; then
 129     shift
 130     break
 131   fi
 132   from=$1
 133   shift
 134   to=$1
 135   shift
 136   sed_fix_filenames="${sed_fix_filenames}s|"`quote_for_sed "$from"`"|$to|g;"
 137   sed_fix_header_guards="${sed_fix_header_guards}s|"`guard "$from"`"|"`guard "$to"`"|g;"
 138 done
 139
 140 # The program to run.
 141 prog=$1
 142 shift
 143 # Make any relative path in $prog absolute.
 144 case $prog in
 145   [\\/]* | ?:[\\/]*) ;;
 146   *[\\/]*) prog=`pwd`/$prog ;;
 147 esac
 148
 149 dirname=ylwrap$$
 150 do_exit="cd '`pwd`' && rm -rf $dirname > /dev/null 2>&1;"' (exit $ret); exit $ret'
 151 trap "ret=129; $do_exit" 1
 152 trap "ret=130; $do_exit" 2
 153 trap "ret=141; $do_exit" 13
 154 trap "ret=143; $do_exit" 15
 155 mkdir $dirname || exit 1
 156
 157 cd $dirname
 158
 159 case $# in
 160   0) "$prog" "$input" ;;
 161   *) "$prog" "$@" "$input" ;;
 162 esac
 163 ret=$?
 164
 165 if test $ret -eq 0; then
 166   for from in *
 167   do
 168     to=`printf '%s\n' "$from" | sed "$sed_fix_filenames"`
 169     if test -f "$from"; then
 170       # If $2 is an absolute path name, then just use that,
 171       # otherwise prepend '../'.
 172       case $to in
 173         [\\/]* | ?:[\\/]*) target=$to;;
 174         *) target=../$to;;
 175       esac
 176
 177       # Do not overwrite unchanged header files to avoid useless
 178       # recompilations.  Always update the parser itself: it is the
 179       # destination of the .y.c rule in the Makefile.  Divert the
 180       # output of all other files to a temporary file so we can
 181       # compare them to existing versions.
 182       if test $from != $parser; then
 183         realtarget=$target
 184         target=tmp-`printf '%s\n' "$target" | sed 's|.*[\\/]||g'`
 185       fi
 186
 187       # Munge "#line" or "#" directives.  Don't let the resulting
 188       # debug information point at an absolute srcdir.  Use the real
 189       # output file name, not yy.lex.c for instance.  Adjust the
 190       # include guards too.
 191       sed -e "/^#/!b"                           \
 192           -e "s|$input_rx|$input_sub_rx|"       \
 193           -e "$sed_fix_filenames"               \
 194           -e "$sed_fix_header_guards"           \
 195         "$from" >"$target" || ret=$?
 196
 197       # Check whether files must be updated.
 198       if test "$from" != "$parser"; then
 199         if test -f "$realtarget" && cmp -s "$realtarget" "$target"; then
 200           echo "$to is unchanged"
 201           rm -f "$target"
 202         else
 203           echo "updating $to"
 204           mv -f "$target" "$realtarget"
 205         fi
 206       fi
 207     else
 208       # A missing file is only an error for the parser.  This is a
 209       # blatant hack to let us support using "yacc -d".  If -d is not
 210       # specified, don't fail when the header file is "missing".
 211       if test "$from" = "$parser"; then
 212         ret=1
 213       fi
 214     fi
 215   done
 216 fi
 217
 218 # Remove the directory.
 219 cd ..
 220 rm -rf $dirname
 221
 222 exit $ret
 223
 224 # Local Variables:
 225 # mode: shell-script
 226 # sh-indentation: 2
 227 # eval: (add-hook 'write-file-hooks 'time-stamp)
 228 # time-stamp-start: "scriptversion="
 229 # time-stamp-format: "%:y-%02m-%02d.%02H"
 230 # time-stamp-time-zone: "UTC"
 231 # time-stamp-end: "; # UTC"
 232 # End: