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+#! /bin/sh
+# Rename yy.* identifiers to avoid name clashes. This file is part of Grecs.
+# Copyright (C) 2011 Sergey Poznyakoff
+#
+# Grecs is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# Grecs is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Grecs. If not, see <http://www.gnu.org/licenses/>.
+
+# Usage: yyrename [-f OUTFILE [OUTFILE...]] COMMAND INFILE
+# Makefile.am:
+# LEXCOMPILE = yyrename -f $(LEX_OUTPUT_ROOT).c \
+# '$(LEX) $(LFLAGS) $(AM_LFLAGS)'
+# YACCCOMPILE = yyrename '$(YACC) $(YFLAGS) $(AM_YFLAGS)'
+#
+# This script runs COMMAND with INFILE as its argument and scans
+# OUTFILEs for identifiers starting with 'yy'. These identifiers
+# are renamed by replacing 'yy' with the selected prefix.
+#
+# The prefix is looked up in the file yytrans, located in the INFILE's
+# directory. If this file does not exist, the prefix is constructed
+# by concatenating the string 'grecs_' and the ``root name''. The root
+# name is build by removing '-lex.l' or '-gram.y' from the base name.
+# If the latter does not end in any of these, the root name
+# is constructed by removing the suffix from the base name.
+#
+# The yytrans file is a line-oriented lookup table. Empty lines are
+# ignored, usual UNIX comment lines are honored. The remaining lines
+# must consist of two words separated by any amount of whitespace.
+# The first word is a look-up key, the second one provides a translation
+# (yy replacement) for that key.
+#
+# Two look-ups are tried: first the base name and then the root name.
+# If both result in a non-empty replacement, the former is preferred
+# over the latter.
+#
+# The -f option supplies a list of output file names generated by COMMAND.
+# If not supplied, the following defaults are used: y.tab.c and y.tab.h, if
+# INFILE ends in '.y', and yy.lex.c, if it ends in '.l'. If INFILE does not
+# end in any of these suffixes, error is reported.
+#
+# BUGS: Any occurrence of 'yy' is replaced, not only 'yy' prefixes.
+#
+case $1 in
+-f) files=$2
+ shift
+ shift
+esac
+
+base=`expr "$2" : '.*/\(.*\)\.[ly]'`
+dir=`dirname "$2"`
+case $2 in
+*.y) test -z "$files" && files="y.tab.c y.tab.h"
+ root=`expr "$2" : '.*/\(.*\)-gram\.y'`;;
+*.l) test -z "$files" && files=lex.yy.c
+ root=`expr "$2" : '.*/\(.*\)-lex\.l'`;;
+*) if test -z "$files"; then
+ echo >&2 "$0: suffix unknown, files must be given (use -f)"
+ exit 1
+ fi
+ root=$base
+esac
+
+if test -f $dir/yytrans; then
+ pfx=`awk '
+{ sub(/#.*$/,"") }
+NF == 2 && $1=="'$base'" { exact=$2 }
+NF == 2 && $1=="'$root'" { root=$2 }
+{ next }
+END { print exact ? exact : root ? root : "" }' $dir/yytrans`
+else
+ pfx=
+fi
+if test -z "$pfx"; then
+ pfx=grecs_`echo $root | tr .- __`
+fi
+
+eval $* || exit $?
+
+for file in $files
+do
+ mv $file ${file}.tmp
+ sed "s/yy/$pfx/g" ${file}.tmp > $file
+done

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