#!/usr/bin/env perl
#
# Copyright (c) 2003, 2004 Tama Communications Corporation
#
# This file is part of GNU GLOBAL.
#
# This program 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 of the License, or
# (at your option) any later version.
# 
# 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 GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

#
# This command does one of the followings:
#
# [1] Generate option string for gperf(1).
# [2] Generate regular expression which means reserved words for htags(1).
# [3] Generate gperf(1) source from keyword file.
#
# Both output is stdout.
#
$com = $0;
$com =~ s/.*\///;

#
# Allocation of ID
#
# 1001 - 2000: Reserved variable (PHP)
# 2001 -; Reserved word (wide sense)
#	2001 - 3000: reserved word
#	3001 - 4000: # macro
#	4001 - 5000: yacc word
#
$START_VARIABLE = 1001;
$START_WORD = 2001;
$START_SHARP = 3001;
$START_YACC = 4001;

sub usage {
	print STDERR "usage: $com --prefix=prefix --option\n";
	print STDERR "       $com --prefix=prefix --perl keyword_file\n";
	print STDERR "       $com --prefix=prefix keyword_file\n";
	exit(1);
}

$slot_name = 'name';
$option = 0;
$perl = 0;
$prefix = '';
$keyword_file = '';
while ($ARGV[0] =~ /^-/) {
	$opt = shift;
	if ($opt =~ /^--prefix=(.*)$/) {
		$prefix = $1;
	} elsif ($opt =~ /^--option$/) {
		$option = 1;
	} elsif ($opt =~ /^--perl$/) {
		$perl = 1;
	} else {
		usage();
	}
}
$keyword_file = $ARGV[0];
if (!$prefix) {
	usage();
}
#
# [1] Generate option string for gperf(1).
#
if ($option) {
	print "--language=ANSI-C\n";
	print "--struct-type\n";
	print "--slot-name=${slot_name}\n";
	print "--hash-fn-name=${prefix}_hash\n";
	print "--lookup-fn-name=${prefix}_lookup\n";
	exit(0);
}
if (!$keyword_file) {
	usage();
}
#
# [2] Generate regular expression which means reserved words for htags(1).
#
if ($perl) {
	local(@array);
	open(IP, $keyword_file) || die("$com: cannot open file '$keyword_file'.\n");
	while(<IP>) {
		chop;
		next if (/^$/ || /^;/);
		($id, $type) = split;
		if ($prefix eq 'sharp') {
			if ($type eq 'sharp' && $id ne '##') {
				$id =~ s/#//g;
				push(@array, $id);
			}
		} else {
			if ($type eq 'word') {
				@id = split(/,/, $id);
				for ($i = 0; $i < @id; $i++) {
					push(@array, $id[$i]);
				}
			}
		}
	}
	close(IP);
	#
	# Sort by the length to match pattern to a longer name.
	#
	sub compare { length($b) <=> length($a); }
	@array = sort compare @array;

	print "# This part is generated automatically by $com from '$keyword_file'.\n";
	if ($prefix eq 'sharp') {
		print "\$'sharp_macros = \"(";
	} else {
		print "\$'${prefix}_reserved_words = \"(";
	}
	print join('|', @array);
	print ")\";\n";
	print "# end of generated part.\n";
	close(IP);
	exit(0);
}
#
# [3] Generate gperf(1) source from keyword file.
#
$PRE = $pre = $prefix;
$PRE =~ tr/a-z/A-Z/;
$pre =~ tr/A-Z/a-z/;
local(%yacctab) = ('%%', 'SEP', '%{', 'BEGIN', '%}', 'END');

#
# Macro definitions.
#
$n_variable = $START_VARIABLE;
$n_word = $START_WORD;
$n_sharp = $START_SHARP;
$n_yacc = $START_YACC;

open(IP, $keyword_file) || die("$com: cannot open file '$keyword_file'.\n");
print "%{\n";
print "#include \"strmake.h\"\n";
print "#define START_VARIABLE\t$n_variable\n";
print "#define START_WORD\t$n_word\n";
print "#define START_SHARP\t$n_sharp\n";
print "#define START_YACC\t$n_yacc\n";
print "#define IS_RESERVED_WORD(a)	((a) >= START_WORD)\n";
print "#define IS_RESERVED_VARIABLE(a)	((a) >= START_VARIABLE && (a) < START_WORD)\n";
print "#define IS_RESERVED_SHARP(a)	((a) >= START_SHARP && (a) < START_YACC)\n";
print "#define IS_RESERVED_YACC(a)	((a) >= START_YACC)\n";
print "\n";
while(<IP>) {
	chop;
	next if (/^$/ || /^;/);
	($id, $type) = split;
	@id = split(/,/, $id);
	$upper = $id[0];
	$upper =~ tr/a-z/A-Z/;
	if ($type eq 'word') {
		$upper =~ s/::/WCOLON/;
		print "#define ${PRE}_${upper}\t${n_word}\n";
		$n_word++;
	} elsif ($type eq 'variable') {
		print "#define ${PRE}_${upper}\t${n_variable}\n";
		$n_variable++;
	} elsif ($type eq 'sharp') {
		$upper =~ s/##/SHARP/;
		$upper =~ s/#//g;
		print "#define SHARP_${upper}\t${n_sharp}\n";
		$n_sharp++;
	} elsif ($type eq 'yacc') {
		$upper =~ s/(%%|%\{|%\})/$yacctab{$1}/ge;
		$upper =~ s/%//g;
		$upper =~ s/-/_/g;
		print "#define YACC_${upper}\t${n_yacc}\n";
		$n_yacc++;
	}
}
close(IP);
print "%}\n";
#
# Structure definition.
#
print "struct keyword { char *${slot_name}; int token; }\n";
print "%%\n";
#
# Keyword definitions.
#
open(IP, $keyword_file) || die("$com: cannot open file '$keyword_file'.\n");
while(<IP>) {
	chop;
	next if (/^$/ || /^;/);
	($id, $type) = split;
	@id = split(/,/, $id);
	$upper = $id[0];
	$upper =~ tr/a-z/A-Z/;
	for ($i = 0; $i < @id; $i++) {
		$name = $id[$i];
		if ($type eq 'word') {
			$upper =~ s/::/WCOLON/;
			print "$name, ${PRE}_${upper}\n";
		} elsif ($type eq 'variable') {
			print "\"${name}\", ${PRE}_${upper}\n";
		} elsif ($type eq 'sharp') {
			$upper =~ s/##/SHARP/;
			$upper =~ s/#//g;
			print "\"${name}\", SHARP_${upper}\n";
		} elsif ($type eq 'yacc') {
			$upper =~ s/(%%|%\{|%\})/$yacctab{$1}/ge;
			$upper =~ s/%//g;
			$upper =~ s/-/_/g;
			print "\"${name}\", YACC_${upper}\n";
		}
	}
}
close(IP);
print "%%\n";
#
# Generate reserved_xxxx() procedures.
#
sub generate_procedure {
	local($type) = @_;
	local($TYPE) = $type;

	$TYPE =~ tr/a-z/A-Z/;
	print "int\n";
	print "${prefix}_reserved_${type}(const char *str, int len)\n";
	print "{\n";
	print "\tstruct keyword *keyword;\n";
	print "\n";
	if ($type eq 'sharp') {
		print "\t/* Delete blanks. Ex. ' # define ' => '#define' */\n";
		print "\tstr = strtrim(str, TRIM_ALL, &len);\n";
		print "\n";
	}
	print "\tkeyword = ${pre}_lookup(str, len);\n";
	print "\treturn (keyword && IS_RESERVED_${TYPE}(keyword->token)) ? keyword->token : 0;\n";
	print "}\n";
}
if ($n_word > $START_WORD) {
	generate_procedure('word');
}
if ($n_variable > $START_VARIABLE) {
	generate_procedure('variable');
}
if ($n_sharp > $START_SHARP) {
	generate_procedure('sharp');
}
if ($n_yacc > $START_YACC) {
	generate_procedure('yacc');
}
exit 0;