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#
# $Id: Tr.pm,v 0.60 1999/10/18 06:01:38 dankogai Exp dankogai $
#
package Jcode::Tr;
use strict;
use vars qw($VERSION $RCSID);
$RCSID = q$Id: Tr.pm,v 0.60 1999/10/18 06:01:38 dankogai Exp dankogai $;
$VERSION = do { my @r = (q$Revision: 0.60 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
use Carp;
use Jcode::Constants qw(:all);
use vars qw(%_TABLE);
sub tr {
# $prev_from, $prev_to, %table are persistent variables
my ($r_str, $from, $to, $opt) = @_;
my (@from, @to);
my $n = 0;
undef %_TABLE;
&_maketable($from, $to, $opt);
$$r_str =~ s(
([\x80-\xff][\x00-\xff]|[\x00-\xff])
)
{defined($_TABLE{$1}) && ++$n ?
$_TABLE{$1} : $1}ogex;
return $n;
}
sub _maketable {
my ($from, $to, $opt) = @_;
my ($ascii) = '(\\\\[\\-\\\\]|[\x00-\x5b\x5d-\x7f])';
grep(s/(([\x80-\xff])[\x80-\xff]-\2[\x80-\xff])/&_expnd2($1)/geo,
$from,$to);
grep(s/($ascii-$ascii)/&_expnd1($1)/geo,
$from,$to);
my @to = $to =~ /[\x80-\xff][\x00-\xff]|[\x00-\xff]/go;
my @from = $from =~ /[\x80-\xff][\x00-\xff]|[\x00-\xff]/go;
push(@to, ($opt =~ /d/ ? '' : $to[$#to]) x (@from - @to)) if @to < @from;
@_TABLE{@from} = @to;
}
sub _expnd1 {
my ($str) = @_;
s/\\(.)/$1/og;
my($c1, $c2) = unpack('CxC', $str);
if ($c1 <= $c2) {
for ($str = ''; $c1 <= $c2; $c1++) {
$str .= pack('C', $c1);
}
}
return $str;
}
sub _expnd2 {
my ($str) = @_;
my ($c1, $c2, $c3, $c4) = unpack('CCxCC', $str);
if ($c1 == $c3 && $c2 <= $c4) {
for ($str = ''; $c2 <= $c4; $c2++) {
$str .= pack('CC', $c1, $c2);
}
}
return $str;
}
1;
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