lib/ylwrap

   1 #! /bin/sh
   2 # ylwrap - wrapper for lex/yacc invocations.
   3
   4 scriptversion=2024-06-19.01; # UTC
   5
   6 # Copyright (C) 1996-2024 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 <https://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   -h|--h*)
  70     cat <<\EOF
  71 Usage: ylwrap [--help|--version] INPUT [OUTPUT DESIRED]... -- PROGRAM [ARGS]...
  72
  73 Wrapper for lex/yacc invocations, renaming files as desired.
  74
  75   INPUT is the input file
  76   OUTPUT is one file PROG generates
  77   DESIRED is the file we actually want instead of OUTPUT
  78   PROGRAM is program to run
  79   ARGS are passed to PROG
  80
  81 Any number of OUTPUT,DESIRED pairs may be used.
  82
  83 Report bugs to <bug-automake@gnu.org>.
  84 GNU Automake home page: <https://www.gnu.org/software/automake/>.
  85 General help using GNU software: <https://www.gnu.org/gethelp/>.
  86 EOF
  87     exit $?
  88     ;;
  89   -v|--v*)
  90     echo "ylwrap (GNU Automake) $scriptversion"
  91     exit $?
  92     ;;
  93 esac
  94
  95
  96 # The input.
  97 input=$1
  98 shift
  99 # We'll later need for a correct munging of "#line" directives.
 100 input_sub_rx=`get_dirname "$input" | quote_for_sed`
 101 case $input in
 102   [\\/]* | ?:[\\/]*)
 103     # Absolute path; do nothing.
 104     ;;
 105   *)
 106     # Relative path.  Make it absolute.
 107     input=`pwd`/$input
 108     ;;
 109 esac
 110 input_rx=`get_dirname "$input" | quote_for_sed`
 111
 112 # Since DOS filename conventions don't allow two dots,
 113 # the DOS version of Bison writes out y_tab.c instead of y.tab.c
 114 # and y_tab.h instead of y.tab.h. Test to see if this is the case.
 115 y_tab_nodot=false
 116 if test -f y_tab.c || test -f y_tab.h; then
 117   y_tab_nodot=true
 118 fi
 119
 120 # The parser itself, the first file, is the destination of the .y.c
 121 # rule in the Makefile.
 122 parser=$1
 123
 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 sed_fix_filenames=
 128
 129 # Also rename header guards, as Bison 2.7 for instance uses its header
 130 # guard in its implementation file.
 131 sed_fix_header_guards=
 132
 133 while test $# -ne 0; do
 134   if test x"$1" = x"--"; then
 135     shift
 136     break
 137   fi
 138   from=$1
 139   # Handle y_tab.c and y_tab.h output by DOS
 140   if $y_tab_nodot; then
 141     case $from in
 142       "y.tab.c") from=y_tab.c;;
 143       "y.tab.h") from=y_tab.h;;
 144     esac
 145   fi
 146   shift
 147   to=$1
 148   shift
 149   sed_fix_filenames="${sed_fix_filenames}s|"`quote_for_sed "$from"`"|$to|g;"
 150   sed_fix_header_guards="${sed_fix_header_guards}s|"`guard "$from"`"|"`guard "$to"`"|g;"
 151 done
 152
 153 # The program to run.
 154 prog=$1
 155 shift
 156 # Make any relative path in $prog absolute.
 157 case $prog in
 158   [\\/]* | ?:[\\/]*) ;;
 159   *[\\/]*) prog=`pwd`/$prog ;;
 160 esac
 161
 162 dirname=ylwrap$$
 163 do_exit="cd '`pwd`' && rm -rf $dirname > /dev/null 2>&1;"' (exit $ret); exit $ret'
 164 trap "ret=129; $do_exit" 1
 165 trap "ret=130; $do_exit" 2
 166 trap "ret=141; $do_exit" 13
 167 trap "ret=143; $do_exit" 15
 168 mkdir $dirname || exit 1
 169
 170 cd $dirname
 171
 172 case $# in
 173   0) "$prog" "$input" ;;
 174   *) "$prog" "$@" "$input" ;;
 175 esac
 176 ret=$?
 177
 178 if test $ret -eq 0; then
 179   for from in *
 180   do
 181     to=`printf '%s\n' "$from" | sed "$sed_fix_filenames"`
 182     if test -f "$from"; then
 183       # If $2 is an absolute path name, then just use that,
 184       # otherwise prepend '../'.
 185       case $to in
 186         [\\/]* | ?:[\\/]*) target=$to;;
 187         *) target=../$to;;
 188       esac
 189
 190       # Do not overwrite unchanged header files to avoid useless
 191       # recompilations.  Always update the parser itself: it is the
 192       # destination of the .y.c rule in the Makefile.  Divert the
 193       # output of all other files to a temporary file so we can
 194       # compare them to existing versions.
 195       if test $from != $parser; then
 196         realtarget=$target
 197         target=tmp-`printf '%s\n' "$target" | sed 's|.*[\\/]||g'`
 198       fi
 199
 200       # Munge "#line" or "#" directives.  Don't let the resulting
 201       # debug information point at an absolute srcdir.  Use the real
 202       # output file name, not yy.lex.c for instance.  Adjust the
 203       # include guards too.
 204       sed -e "/^#/!b"                           \
 205           -e "s|$input_rx|$input_sub_rx|"       \
 206           -e "$sed_fix_filenames"               \
 207           -e "$sed_fix_header_guards"           \
 208         "$from" >"$target" || ret=$?
 209
 210       # Check whether files must be updated.
 211       if test "$from" != "$parser"; then
 212         if test -f "$realtarget" && cmp -s "$realtarget" "$target"; then
 213           echo "$to is unchanged"
 214           rm -f "$target"
 215         else
 216           echo "updating $to"
 217           mv -f "$target" "$realtarget"
 218         fi
 219       fi
 220     else
 221       # A missing file is only an error for the parser.  This is a
 222       # blatant hack to let us support using "yacc -d".  If -d is not
 223       # specified, don't fail when the header file is "missing".
 224       if test "$from" = "$parser"; then
 225         ret=1
 226       fi
 227     fi
 228   done
 229 fi
 230
 231 # Remove the directory.
 232 cd ..
 233 rm -rf $dirname
 234
 235 exit $ret
 236
 237 # Local Variables:
 238 # mode: shell-script
 239 # sh-indentation: 2
 240 # eval: (add-hook 'before-save-hook 'time-stamp)
 241 # time-stamp-start: "scriptversion="
 242 # time-stamp-format: "%:y-%02m-%02d.%02H"
 243 # time-stamp-time-zone: "UTC0"
 244 # time-stamp-end: "; # UTC"
 245 # End: