#! /usr/bin/perl
#
# Copyright (c) 2001-2011, PostgreSQL Global Development Group
#
# src/backend/utils/mb/Unicode/UCS_to_BIG5.pl
#
# Generate UTF-8 <--> BIG5 conversion tables from
# map files provided by Unicode organization.
# Unfortunately it is prohibited by the organization
# to distribute the map files. So if you try to use this script,
# you have to obtain the map files from the organization's ftp site.
# ftp://www.unicode.org/Public/MAPPINGS/
#
# Our "big5" comes from BIG5.TXT, with the addition of the characters
# in the range 0xf9d6-0xf9dc from CP950.TXT.
#
# BIG5.TXT format:
#		 BIG5 code in hex
#		 UCS-2 code in hex
#		 # and Unicode name (not used in this script)
#
# CP950.TXT format:
#		 CP950 code in hex
#		 UCS-2 code in hex
#		 # and Unicode name (not used in this script)


require "ucs2utf.pl";


#
# first, generate UTF8 --> BIG5 table
#
$in_file = "BIG5.TXT";

open( FILE, $in_file ) || die( "cannot open $in_file" );

reset 'array';

while( <FILE> ){
	chop;
	if( /^#/ ){
		next;
	}
	( $c, $u, $rest ) = split;
	$ucs = hex($u);
	$code = hex($c);
	if( $code >= 0x80 && $ucs >= 0x0080){
		$utf = &ucs2utf($ucs);
		if( $array{ $utf } ne "" ){
			printf STDERR "Warning: duplicate UTF8: %04x\n",$ucs;
			next;
		}
		$count++;
		$array{ $utf } = $code;
	}
}
close( FILE );

$in_file = "CP950.TXT";

open( FILE, $in_file ) || die( "cannot open $in_file" );

while( <FILE> ){
	chop;
	if( /^#/ ){
		next;
	}
	( $c, $u, $rest ) = split;
	$ucs = hex($u);
	$code = hex($c);

	# Pick only the ETEN extended characters in the range 0xf9d6 - 0xf9dc
	# from CP950.TXT
	if( $code >= 0x80 && $ucs >= 0x0080 &&
	    $code >= 0xf9d6 && $code <= 0xf9dc ){
		$utf = &ucs2utf($ucs);
		if( $array{ $utf } ne "" ){
			printf STDERR "Warning: duplicate UTF8: %04x\n",$ucs;
			next;
		}
		$count++;
		$array{ $utf } = $code;
	}
}
close( FILE );

$file = lc("utf8_to_big5.map");
open( FILE, "> $file" ) || die( "cannot open $file" );
print FILE "static pg_utf_to_local ULmapBIG5[ $count ] = {\n";

for $index ( sort {$a <=> $b} keys( %array ) ){
	$code = $array{ $index };
	$count--;
	if( $count == 0 ){
		printf FILE "  {0x%04x, 0x%04x}\n", $index, $code;
	} else {
		printf FILE "  {0x%04x, 0x%04x},\n", $index, $code;
	}
}

print FILE "};\n";
close(FILE);

#
# then generate BIG5 --> UTF8 table
#
$in_file = "BIG5.TXT";

open( FILE, $in_file ) || die( "cannot open $in_file" );

reset 'array';

while( <FILE> ){
	chop;
	if( /^#/ ){
		next;
	}
	( $c, $u, $rest ) = split;
	$ucs = hex($u);
	$code = hex($c);
	if( $code >= 0x80 && $ucs >= 0x0080){
		$utf = &ucs2utf($ucs);
		if( $array{ $utf } ne "" ){
			printf STDERR "Warning: duplicate UTF8: %04x\n",$ucs;
			next;
		}
		$count++;
		$array{ $code } = $utf;
	}
}
close( FILE );

$in_file = "CP950.TXT";

open( FILE, $in_file ) || die( "cannot open $in_file" );

while( <FILE> ){
	chop;
	if( /^#/ ){
		next;
	}
	( $c, $u, $rest ) = split;
	$ucs = hex($u);
	$code = hex($c);

	# Pick only the ETEN extended characters in the range 0xf9d6 - 0xf9dc
	# from CP950.TXT
	if( $code >= 0x80 && $ucs >= 0x0080 &&
	    $code >= 0xf9d6 && $code <= 0xf9dc ){
		$utf = &ucs2utf($ucs);
		if( $array{ $utf } ne "" ){
			printf STDERR "Warning: duplicate UTF8: %04x\n",$ucs;
			next;
		}
		$count++;
		$array{ $code } = $utf;
	}
}
close( FILE );

$file = lc("big5_to_utf8.map");
open( FILE, "> $file" ) || die( "cannot open $file" );
print FILE "static pg_local_to_utf LUmapBIG5[ $count ] = {\n";
for $index ( sort {$a <=> $b} keys( %array ) ){
	$utf = $array{ $index };
	$count--;
	if( $count == 0 ){
		printf FILE "  {0x%04x, 0x%04x}\n", $index, $utf;
	} else {
		printf FILE "  {0x%04x, 0x%04x},\n", $index, $utf;
	}
}

print FILE "};\n";
close(FILE);
