1#! /bin/sh
2# ylwrap - wrapper for lex/yacc invocations.
3
4scriptversion=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
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  --basedir)
70    basedir=$2
71    shift 2
72    ;;
73  -h|--h*)
74    cat <<\EOF
75Usage: ylwrap [--help|--version] INPUT [OUTPUT DESIRED]... -- PROGRAM [ARGS]...
76
77Wrapper 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
85Any number of OUTPUT,DESIRED pairs may be used.
86
87Report bugs to <bug-automake@gnu.org>.
88EOF
89    exit $?
90    ;;
91  -v|--v*)
92    echo "ylwrap $scriptversion"
93    exit $?
94    ;;
95esac
96
97
98# The input.
99input=$1
100shift
101# We'll later need for a correct munging of "#line" directives.
102input_sub_rx=`get_dirname "$input" | quote_for_sed`
103case $input in
104  [\\/]* | ?:[\\/]*)
105    # Absolute path; do nothing.
106    ;;
107  *)
108    # Relative path.  Make it absolute.
109    input=`pwd`/$input
110    ;;
111esac
112input_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.
116parser=$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.
121sed_fix_filenames=
122
123# Also rename header guards, as Bison 2.7 for instance uses its header
124# guard in its implementation file.
125sed_fix_header_guards=
126
127while 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;"
138done
139
140# The program to run.
141prog=$1
142shift
143# Make any relative path in $prog absolute.
144case $prog in
145  [\\/]* | ?:[\\/]*) ;;
146  *[\\/]*) prog=`pwd`/$prog ;;
147esac
148
149dirname=ylwrap$$
150do_exit="cd '`pwd`' && rm -rf $dirname > /dev/null 2>&1;"' (exit $ret); exit $ret'
151trap "ret=129; $do_exit" 1
152trap "ret=130; $do_exit" 2
153trap "ret=141; $do_exit" 13
154trap "ret=143; $do_exit" 15
155mkdir $dirname || exit 1
156
157cd $dirname
158
159case $# in
160  0) "$prog" "$input" ;;
161  *) "$prog" "$@" "$input" ;;
162esac
163ret=$?
164
165if 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
216fi
217
218# Remove the directory.
219cd ..
220rm -rf $dirname
221
222exit $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:
233