Here some hacky code to generate diffs of the grammar rules. Maybe it
appears to be usefull:
#! /bin/sh
# shell script to diff grammars
# usage: $0 grammar-old.y grammar-new.y
TMPDIR="/tmp/diffgrammar.$$"
PWD=`pwd`
AWKCODE='
BEGIN { RULE=""; }
/^rule/ { if ( RULE != $3 ) { print $3" ->"; RULE = $3 }; match($0,/^rule[\ \t]*[0-9]+[\ \t]*[@A-Za-z_0-9]+[\
\t]*->[\\t]*/); print "\t\t"substr($0,RLENGTH);
}
'
mkdir -p ${TMPDIR}/old ${TMPDIR}/new
cp $1 ${TMPDIR}/old
cp $2 ${TMPDIR}/new
cd ${TMPDIR}/old
bison -v `basename $1`
awk "${AWKCODE}" *.output > grammar.rules
cd ${TMPDIR}/new
bison -v `basename $2`
awk "${AWKCODE}" *.output > grammar.rules
cd ${TMPDIR}
diff -u old/grammar.rules new/grammar.rules
cd ${PWD}
rm -rf ${TMPDIR}
--
Holger Krug
hkrug@rationalizer.com
