1#! /bin/sh
2# ylwrap - wrapper for lex/yacc invocations.
3
4scriptversion=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
32get_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.
43guard ()
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.
55quote_for_sed ()
56{
57  case $# in
58    0) cat;;
59    1) printf '%s\n' "$1";;
60  esac \
61    | sed -e 's|[][\\.*]|\\&|g'
62}
63
64case "$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
71Usage: ylwrap [--help|--version] INPUT [OUTPUT DESIRED]... -- PROGRAM [ARGS]...
72
73Wrapper 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
81Any number of OUTPUT,DESIRED pairs may be used.
82
83Report bugs to <bug-automake@gnu.org>.
84GNU Automake home page: <https://www.gnu.org/software/automake/>.
85General help using GNU software: <https://www.gnu.org/gethelp/>.
86EOF
87    exit $?
88    ;;
89  -v|--v*)
90    echo "ylwrap (GNU Automake) $scriptversion"
91    exit $?
92    ;;
93esac
94
95
96# The input.
97input=$1
98shift
99# We'll later need for a correct munging of "#line" directives.
100input_sub_rx=`get_dirname "$input" | quote_for_sed`
101case $input in
102  [\\/]* | ?:[\\/]*)
103    # Absolute path; do nothing.
104    ;;
105  *)
106    # Relative path.  Make it absolute.
107    input=`pwd`/$input
108    ;;
109esac
110input_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.
115y_tab_nodot=false
116if test -f y_tab.c || test -f y_tab.h; then
117  y_tab_nodot=true
118fi
119
120# The parser itself, the first file, is the destination of the .y.c
121# rule in the Makefile.
122parser=$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.
127sed_fix_filenames=
128
129# Also rename header guards, as Bison 2.7 for instance uses its header
130# guard in its implementation file.
131sed_fix_header_guards=
132
133while 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;"
151done
152
153# The program to run.
154prog=$1
155shift
156# Make any relative path in $prog absolute.
157case $prog in
158  [\\/]* | ?:[\\/]*) ;;
159  *[\\/]*) prog=`pwd`/$prog ;;
160esac
161
162dirname=ylwrap$$
163do_exit="cd '`pwd`' && rm -rf $dirname > /dev/null 2>&1;"' (exit $ret); exit $ret'
164trap "ret=129; $do_exit" 1
165trap "ret=130; $do_exit" 2
166trap "ret=141; $do_exit" 13
167trap "ret=143; $do_exit" 15
168mkdir $dirname || exit 1
169
170cd $dirname
171
172case $# in
173  0) "$prog" "$input" ;;
174  *) "$prog" "$@" "$input" ;;
175esac
176ret=$?
177
178if 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
229fi
230
231# Remove the directory.
232cd ..
233rm -rf $dirname
234
235exit $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:
246