lib/ylwrap

   1 #! /bin/sh
   2 # ylwrap - wrapper for lex/yacc invocations.
   3
   4 scriptversion=2012-07-14.08; # UTC
   5
   6 # Copyright (C) 1996-2012 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|\([\\/]\)[^\\/]*$|\1|';;
  36     # Otherwise,  we want the empty string (not ".").
  37   esac
  38 }
  39
  40 # guard FILE
  41 # ----------
  42 # The CPP macro used to guard inclusion of FILE.
  43 guard()
  44 {
  45   printf '%s\n' "$from" \
  46     | sed \
  47         -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'\
  48         -e 's/[^ABCDEFGHIJKLMNOPQRSTUVWXYZ]/_/g'
  49 }
  50
  51 # quote_for_sed [STRING]
  52 # ----------------------
  53 # Return STRING (or stdin) quoted to be used as a sed pattern.
  54 quote_for_sed ()
  55 {
  56   case $# in
  57     0) cat;;
  58     1) printf '%s\n' "$1";;
  59   esac \
  60     | sed -e 's|[][\\.*]|\\&|g'
  61 }
  62
  63 case "$1" in
  64   '')
  65     echo "$0: No files given.  Try '$0 --help' for more information." 1>&2
  66     exit 1
  67     ;;
  68   --basedir)
  69     basedir=$2
  70     shift 2
  71     ;;
  72   -h|--h*)
  73     cat <<\EOF
  74 Usage: ylwrap [--help|--version] INPUT [OUTPUT DESIRED]... -- PROGRAM [ARGS]...
  75
  76 Wrapper for lex/yacc invocations, renaming files as desired.
  77
  78   INPUT is the input file
  79   OUTPUT is one file PROG generates
  80   DESIRED is the file we actually want instead of OUTPUT
  81   PROGRAM is program to run
  82   ARGS are passed to PROG
  83
  84 Any number of OUTPUT,DESIRED pairs may be used.
  85
  86 Report bugs to <bug-automake@gnu.org>.
  87 EOF
  88     exit $?
  89     ;;
  90   -v|--v*)
  91     echo "ylwrap $scriptversion"
  92     exit $?
  93     ;;
  94 esac
  95
  96
  97 # The input.
  98 input="$1"
  99 shift
 100 # We'll later need for a correct munging of "#line" directives.
 101 input_sub_rx=`get_dirname "$input" | quote_for_sed`
 102 case "$input" in
 103   [\\/]* | ?:[\\/]*)
 104     # Absolute path; do nothing.
 105     ;;
 106   *)
 107     # Relative path.  Make it absolute.
 108     input="`pwd`/$input"
 109     ;;
 110 esac
 111 input_rx=`get_dirname "$input" | quote_for_sed`
 112
 113 # Since DOS filename conventions don't allow two dots,
 114 # the DOS version of Bison writes out y_tab.c instead of y.tab.c
 115 # and y_tab.h instead of y.tab.h. Test to see if this is the case.
 116 y_tab_nodot=false
 117 if test -f y_tab.c || test -f y_tab.h; then
 118   y_tab_nodot=true
 119 fi
 120
 121 # The parser itself, the first file, is the destination of the .y.c
 122 # rule in the Makefile.
 123 parser=$1
 124 # A sed program to s/FROM/TO/g for all the FROM/TO so that, for
 125 # instance, we rename #include "y.tab.h" into #include "parse.h"
 126 # during the conversion from y.tab.c to parse.c.
 127 rename_sed=
 128 while test "$#" -ne 0; do
 129   if test "$1" = "--"; then
 130     shift
 131     break
 132   fi
 133   from=$1
 134   # Handle y_tab.c and y_tab.h output by DOS
 135   if $y_tab_nodot; then
 136     case $from in
 137       "y.tab.c") from=y_tab.c;;
 138       "y.tab.h") from=y_tab.h;;
 139     esac
 140   fi
 141   shift
 142   to=$1
 143   shift
 144   rename_sed="${rename_sed}s|"`quote_for_sed "$from"`"|$to|g;"
 145 done
 146
 147 # The program to run.
 148 prog="$1"
 149 shift
 150 # Make any relative path in $prog absolute.
 151 case "$prog" in
 152   [\\/]* | ?:[\\/]*) ;;
 153   *[\\/]*) prog="`pwd`/$prog" ;;
 154 esac
 155
 156 # FIXME: add hostname here for parallel makes that run commands on
 157 # other machines.  But that might take us over the 14-char limit.
 158 dirname=ylwrap$$
 159 do_exit="cd '`pwd`' && rm -rf $dirname > /dev/null 2>&1;"' (exit $ret); exit $ret'
 160 trap "ret=129; $do_exit" 1
 161 trap "ret=130; $do_exit" 2
 162 trap "ret=141; $do_exit" 13
 163 trap "ret=143; $do_exit" 15
 164 mkdir $dirname || exit 1
 165
 166 cd $dirname
 167
 168 case $# in
 169   0) "$prog" "$input" ;;
 170   *) "$prog" "$@" "$input" ;;
 171 esac
 172 ret=$?
 173
 174 if test $ret -eq 0; then
 175   for from in *
 176   do
 177     to=`printf '%s\n' "$from" | sed "$rename_sed"`
 178     if test -f "$from"; then
 179       # If $2 is an absolute path name, then just use that,
 180       # otherwise prepend '../'.
 181       case $to in
 182         [\\/]* | ?:[\\/]*) target=$to;;
 183         *) target="../$to";;
 184       esac
 185
 186       # Do not overwrite unchanged header files to avoid useless
 187       # recompilations.  Always update the parser itself: it is the
 188       # destination of the .y.c rule in the Makefile.  Divert the
 189       # output of all other files to a temporary file so we can
 190       # compare them to existing versions.
 191       if test $from != $parser; then
 192         realtarget="$target"
 193         target=tmp-`printf '%s\n' "$target" | sed 's|.*[\\/]||g'`
 194       fi
 195
 196       # Munge "#line" or "#" directives.  Don't let the resulting
 197       # debug information point at an absolute srcdir.  Use the real
 198       # output file name, not yy.lex.c for instance.  Adjust the
 199       # include guards too.
 200       FROM=`guard "$from"`
 201       TARGET=`guard "$to"`
 202       sed -e "/^#/!b" -e "s|$input_rx|$input_sub_rx|" -e "$rename_sed" \
 203           -e "s|$FROM|$TARGET|" "$from" >"$target" || ret=$?
 204
 205       # Check whether files must be updated.
 206       if test "$from" != "$parser"; then
 207         if test -f "$realtarget" && cmp -s "$realtarget" "$target"; then
 208           echo "$to is unchanged"
 209           rm -f "$target"
 210         else
 211           echo "updating $to"
 212           mv -f "$target" "$realtarget"
 213         fi
 214       fi
 215     else
 216       # A missing file is only an error for the parser.  This is a
 217       # blatant hack to let us support using "yacc -d".  If -d is not
 218       # specified, don't fail when the header file is "missing".
 219       if test "$from" = "$parser"; then
 220         ret=1
 221       fi
 222     fi
 223   done
 224 fi
 225
 226 # Remove the directory.
 227 cd ..
 228 rm -rf $dirname
 229
 230 exit $ret
 231
 232 # Local Variables:
 233 # mode: shell-script
 234 # sh-indentation: 2
 235 # eval: (add-hook 'write-file-hooks 'time-stamp)
 236 # time-stamp-start: "scriptversion="
 237 # time-stamp-format: "%:y-%02m-%02d.%02H"
 238 # time-stamp-time-zone: "UTC"
 239 # time-stamp-end: "; # UTC"
 240 # End: