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1 | package Encode::CN::HZ; |
2 | |
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3 | use strict; |
4 | no warnings 'redefine'; # to quell the "use Encode" below |
5 | |
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6 | use vars qw($VERSION); |
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7 | $VERSION = do { my @r = (q$Revision: 0.92 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r }; |
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8 | |
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9 | use Encode::CN; |
10 | use Encode qw|encode decode|; |
11 | use base 'Encode::Encoding'; |
12 | |
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13 | # HZ is but escaped GB, so we implement it with the |
14 | # GB2312(raw) encoding here. Cf. RFC 1842 & 1843. |
15 | |
16 | my $canon = 'hz'; |
17 | my $obj = bless {name => $canon}, __PACKAGE__; |
18 | $obj->Define($canon); |
19 | |
20 | sub decode |
21 | { |
22 | my ($obj,$str,$chk) = @_; |
23 | my $gb = Encode::find_encoding('gb2312'); |
24 | |
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25 | $str =~ s{~ # starting tilde |
26 | (?: |
27 | (~) # another tilde - escaped (set $1) |
28 | | # or |
29 | \n # \n - output nothing |
30 | | # or |
31 | \{ # opening brace of GB data |
32 | ( # set $2 to any number of... |
33 | (?: |
34 | [^~] # non-tilde GB character |
35 | | # or |
36 | ~(?!\}) # tilde not followed by a closing brace |
37 | )* |
38 | ) |
39 | ~\} # closing brace of GB data |
40 | | # XXX: invalid escape - maybe die on $chk? |
41 | ) |
42 | }{ |
43 | (defined $1) ? '~' # two tildes make one tilde |
44 | : |
45 | (defined $2) ? $gb->decode($2, $chk) # decode the characters |
46 | : |
47 | '' # '' on ~\n and invalid escape |
48 | }egx; |
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49 | |
50 | return $str; |
51 | } |
52 | |
53 | sub encode |
54 | { |
55 | my ($obj,$str,$chk) = @_; |
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56 | my ($out, $in_gb); |
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57 | my $gb = Encode::find_encoding('gb2312'); |
58 | |
59 | $str =~ s/~/~~/g; |
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60 | |
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61 | # XXX: Since CHECK and partial decoding has not been implemented yet, |
62 | # we'll use a very crude way to test for GB2312ness. |
63 | |
64 | for my $index (0 .. length($str) - 1) { |
65 | no warnings 'utf8'; |
66 | |
67 | my $char = substr($str, $index, 1); |
68 | my $try = $gb->encode($char); # try encode this char |
69 | |
70 | if (defined($try)) { # is a GB character |
71 | if ($in_gb) { |
72 | $out .= $try; # in GB mode - just append it |
73 | } |
74 | else { |
75 | $out .= "~{$try"; # enter GB mode, then append it |
76 | $in_gb = 1; |
77 | } |
78 | } |
79 | elsif ($in_gb) { |
80 | $out .= "~}$char"; # leave GB mode, then append it |
81 | $in_gb = 0; |
82 | } |
83 | else { |
84 | $out .= $char; # not in GB mode - just append it |
85 | } |
86 | } |
87 | |
88 | $out .= '~}' if $in_gb; # add closing brace as needed |
89 | |
90 | return $out; |
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91 | } |
92 | |
93 | 1; |
94 | __END__ |