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74 lines
1.6 KiB
74 lines
1.6 KiB
4 months ago
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#!/usr/bin/perl
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#
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# Generate Expansion Table of Compatibility Ligatures
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# (c) 2003 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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#
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use strict;
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use warnings;
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print STDERR "Reading ligature list\n";
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open(L, "misc/u-ligatures") || die "lig file open";
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my %ligs = ();
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while (<L>) {
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chomp;
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$ligs{$_} = 1;
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}
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close L;
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print STDERR "Reading decompositions\n";
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open(I, "unidata/UnicodeData.txt") || die "Unable to open UniCode data file";
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my %decs = ();
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while (<I>) {
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chomp;
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(/^$/ || /^#/) && next;
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my ($code,$name,$cat,$comb,$bidir,$decomp,$d0,$d1,$n0,$mirr,$cmt1,$cmt2,$upper,$lower,$title) = split /;/;
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$code =~ /^....$/ || next;
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if (my ($d) = ($decomp =~ /^<compat> (.*)/)) {
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$decs{$code} = $d;
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}
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}
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close I;
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sub expand($) {
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my ($c) = @_;
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if (defined $decs{$c}) {
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return join (" ", map { expand($_) } split(/\s+/, $decs{$c}));
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} else {
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return $c;
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}
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}
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print STDERR "Searching for a perfect hash function\n";
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my $n = keys %ligs;
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my $div = $n-1;
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DIV: while (++$div) {
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#print STDERR "Trying $div... ";
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my @c = ();
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foreach my $l (keys %ligs) {
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my $i = (hex $l) % $div;
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if (defined $c[$i]) {
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#print STDERR "collision\n";
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next DIV;
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}
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$c[$i] = 1;
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}
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#print STDERR "FOUND\n";
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last;
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}
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print STDERR "Filling hash table with $div entries for $n ligatures\n";
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my @ht = map { "NULL" } 1..$div;
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foreach my $l (keys %ligs) {
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my $i = (hex $l) % $div;
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my $w = join(", ", map { "0x$_" } split(/ /, expand($l)));
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$ht[$i] = "/* $l */ (const u16 []) { $w, 0 }";
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}
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print "#define LIG_HASH_SIZE $div\n\n";
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print "static const u16 *_U_lig_hash[] = {\n";
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for (my $i=0; $i<$div; $i++) {
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print "\t", $ht[$i], ",\n";
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}
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print "};\n";
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