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# Copyright 2008 The Go Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file.
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# Modified version of RE2's make_perl_groups.pl.
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# Generate table entries giving character ranges
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# for POSIX/Perl character classes. Rather than
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# figure out what the definition is, it is easier to ask
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# Perl about each letter from 0-128 and write down
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my $regexp = "[$class]";
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for (my $i=0; $i<=129; $i++) {
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if ($i == 129) { $i = 256; }
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if ($i <= 128 && chr($i) =~ $regexp) {
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push @ranges, [$start, $i-1];
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my ($cname, $name, @ranges) = @_;
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print "var code$cname = []int{ /* $name */\n";
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for (my $i=0; $i<@ranges; $i++) {
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my @a = @{$ranges[$i]};
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printf "\t0x%x, 0x%x,\n", $a[0], $a[1];
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if ($negname =~ /:/) {
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$negname =~ y/a-z/A-Z/;
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return "\t`$name`: {+1, code$cname},\n" .
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"\t`$negname`: {-1, code$cname},\n";
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sub PrintClasses($@) {
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my ($cname, @classes) = @_;
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foreach my $cl (@classes) {
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my @ranges = ComputeClass($cl);
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push @entries, PrintClass(++$gen, $cl, @ranges);
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print "var ${cname}Group = map[string]charGroup{\n";
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foreach my $e (@entries) {
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// GENERATED BY make_perl_groups.pl; DO NOT EDIT.
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// make_perl_groups.pl >perl_groups.go
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PrintClasses("perl", @perlclasses);
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PrintClasses("posix", @posixclasses);