This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Changes should mirror version number
[perl5.git] / ext / Encode / lib / Encode / JP / Tr.pm
CommitLineData
0e567a6c
JH
1#
2# $Id: Tr.pm,v 0.77 2002/01/14 11:06:55 dankogai Exp $
3#
4
5package Jcode::Tr;
6
7use strict;
8use vars qw($VERSION $RCSID);
9
10$RCSID = q$Id: Tr.pm,v 0.77 2002/01/14 11:06:55 dankogai Exp $;
11$VERSION = do { my @r = (q$Revision: 0.77 $ =~ /\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
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;