1#
2# $Id: Tr.pm,v 1.1.1.1 2003/08/02 23:39:43 takezoe Exp $
3#
4
5package Jcode::Tr;
6
7use strict;
8use vars qw($VERSION $RCSID);
9
10$RCSID = q$Id: Tr.pm,v 1.1.1.1 2003/08/02 23:39:43 takezoe Exp $;
11$VERSION = do { my @r = (q$Revision: 1.1.1.1 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
12
13use Carp;
14
15use Jcode::Constants qw(:all);
16use vars qw(%_TABLE);
17
18sub tr {
19    # $prev_from, $prev_to, %table are persistent variables
20    my ($r_str, $from, $to, $opt) = @_;
21    my (@from, @to);
22    my $n = 0;
23
24    undef %_TABLE;
25    &_maketable($from, $to, $opt);
26
27    $$r_str =~ s(
28		 ([\x80-\xff][\x00-\xff]|[\x00-\xff])
29		 )
30    {defined($_TABLE{$1}) && ++$n ?
31	 $_TABLE{$1} : $1}ogex;
32
33    return $n;
34}
35
36sub _maketable{
37    my( $from, $to, $opt ) = @_;
38 $opt ||= '';
39    $from =~ s/($RE{EUC_0212}-$RE{EUC_0212})/&_expnd3($1)/geo;
40    $from =~ s/($RE{EUC_KANA}-$RE{EUC_KANA})/&_expnd2($1)/geo;
41    $from =~ s/($RE{EUC_C   }-$RE{EUC_C   })/&_expnd2($1)/geo;
42    $from =~ s/($RE{ASCII   }-$RE{ASCII   })/&_expnd1($1)/geo;
43    $to   =~ s/($RE{EUC_0212}-$RE{EUC_0212})/&_expnd3($1)/geo;
44    $to   =~ s/($RE{EUC_KANA}-$RE{EUC_KANA})/&_expnd2($1)/geo;
45    $to   =~ s/($RE{EUC_C   }-$RE{EUC_C   })/&_expnd2($1)/geo;
46    $to   =~ s/($RE{ASCII   }-$RE{ASCII   })/&_expnd1($1)/geo;
47
48    my @from = $from =~ /$RE{EUC_0212}|$RE{EUC_KANA}|$RE{EUC_C}|[\x00-\xff]/go;
49    my @to   = $to   =~ /$RE{EUC_0212}|$RE{EUC_KANA}|$RE{EUC_C}|[\x00-\xff]/go;
50
51    push @to, ($opt =~ /d/ ? '' : $to[-1]) x ($#from - $#to) if $#to < $#from;
52    @_TABLE{@from} = @to;
53
54}
55
56sub _expnd1 {
57    my ($str) = @_;
58    # s/\\(.)/$1/og; # I dunno what this was doing!?
59    my($c1, $c2) = unpack('CxC', $str);
60    if ($c1 <= $c2) {
61        for ($str = ''; $c1 <= $c2; $c1++) {
62            $str .= pack('C', $c1);
63        }
64    }
65    return $str;
66}
67
68sub _expnd2 {
69    my ($str) = @_;
70    my ($c1, $c2, $c3, $c4) = unpack('CCxCC', $str);
71    if ($c1 == $c3 && $c2 <= $c4) {
72        for ($str = ''; $c2 <= $c4; $c2++) {
73            $str .= pack('CC', $c1, $c2);
74        }
75    }
76    return $str;
77}
78
79sub _expnd3 {
80    my ($str) = @_;
81    my ($c1, $c2, $c3, $c4, $c5, $c6) = unpack('CCCxCCC', $str);
82    if ($c1 == $c4 && $c2 == $c5 && $c3 <= $c6) {
83        for ($str = ''; $c3 <= $c6; $c3++) {
84            $str .= pack('CCC', $c1, $c2, $c3);
85        }
86    }
87    return $str;
88}
89
901;
91