#!/usr/bin/perl -w
######################################################################
#
# Copyright 2007-2009 by Wilson Snyder.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of either the GNU General Public License or the
# Perl Artistic License.
#
# This program 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 Perl Artistic License
# along with this module; see the file COPYING.  If not, see
# www.cpan.org
#
######################################################################

# DESCRIPTION: Diff bison files

use IO::File;
use strict;

my $Debug;

diff($ARGV[0],$ARGV[1]);

sub diff {
    my $a=shift;
    my $b=shift;

    my $ta = "/tmp/bisondiff.$$.a";
    my $tb = "/tmp/bisondiff.$$.b";

    prep($a,$ta);
    prep($b,$tb);

    system("diff -u -w $ta $tb");
}

sub prep {
    my $filename = shift;
    my $wfilename = shift;

    my $fh = IO::File->new("<$filename") or die "%Error: $! $filename";
    my $fho = IO::File->new(">$wfilename") or die "%Error: $! writing $wfilename";

    my %declared;
    my %used;

    my $body = 0;
    my $rule = "";
    my $skip = 1;
    while (defined(my $line = $fh->getline)) {
	if ($skip == 1) {
	    next if $line !~ /%token/;
	    $skip = 2;
	}
	# %type<foo>
	$line =~ s/^(%\S+)<(\S+)>/$1/;
	# rule<foo>
	$line =~ s/^([a-zA-Z0-9_]+)<\S+>:/$1:/;
	# Productions
	$line =~ s/[ \t]{[^}]*?}/\t{}/g;
	$fho->print($line);
    }
}

# Local Variables:
# compile-command: "./bisondiff $WUP/Verilog/Parser/VParseBison.y ../src/verilog.y"
# End: