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#!/usr/bin/perl
# Copyright 2008 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
# Modified version of RE2's make_perl_groups.pl.
# Generate table entries giving character ranges
# for POSIX/Perl character classes. Rather than
# figure out what the definition is, it is easier to ask
# Perl about each letter from 0-128 and write down
# its answer.
@posixclasses = (
"[:alnum:]",
"[:alpha:]",
"[:ascii:]",
"[:blank:]",
"[:cntrl:]",
"[:digit:]",
"[:graph:]",
"[:lower:]",
"[:print:]",
"[:punct:]",
"[:space:]",
"[:upper:]",
"[:word:]",
"[:xdigit:]",
);
@perlclasses = (
"\\d",
"\\s",
"\\w",
);
%overrides = (
# Prior to Perl 5.18, \s did not match vertical tab.
# RE2 preserves that original behaviour.
"\\s:11" => 0,
);
sub ComputeClass($) {
my @ranges;
my ($class) = @_;
my $regexp = "[$class]";
my $start = -1;
for (my $i=0; $i<=129; $i++) {
if ($i == 129) { $i = 256; }
if ($i <= 128 && ($overrides{"$class:$i"} // chr($i) =~ $regexp)) {
if ($start < 0) {
$start = $i;
}
} else {
if ($start >= 0) {
push @ranges, [$start, $i-1];
}
$start = -1;
}
}
return @ranges;
}
sub PrintClass($$@) {
my ($cname, $name, @ranges) = @_;
print "var code$cname = []rune{ /* $name */\n";
for (my $i=0; $i<@ranges; $i++) {
my @a = @{$ranges[$i]};
printf "\t0x%x, 0x%x,\n", $a[0], $a[1];
}
print "}\n\n";
my $n = @ranges;
$negname = $name;
if ($negname =~ /:/) {
$negname =~ s/:/:^/;
} else {
$negname =~ y/a-z/A-Z/;
}
return "\t`$name`: {+1, code$cname},\n" .
"\t`$negname`: {-1, code$cname},\n";
}
my $gen = 0;
sub PrintClasses($@) {
my ($cname, @classes) = @_;
my @entries;
foreach my $cl (@classes) {
my @ranges = ComputeClass($cl);
push @entries, PrintClass(++$gen, $cl, @ranges);
}
print "var ${cname}Group = map[string]charGroup{\n";
foreach my $e (@entries) {
print $e;
}
print "}\n";
my $count = @entries;
}
print <<EOF;
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// GENERATED BY make_perl_groups.pl; DO NOT EDIT.
// make_perl_groups.pl >perl_groups.go
package syntax
EOF
PrintClasses("perl", @perlclasses);
PrintClasses("posix", @posixclasses);