1package Encode::JP::JIS7;
2use strict;
3
4our $VERSION = do { my @r = (q$Revision: 2.0 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
5
6use Encode qw(:fallbacks);
7
8for my $name ('7bit-jis', 'iso-2022-jp', 'iso-2022-jp-1'){
9    my $h2z     = ($name eq '7bit-jis')    ? 0 : 1;
10    my $jis0212 = ($name eq 'iso-2022-jp') ? 0 : 1;
11
12    $Encode::Encoding{$name} =
13        bless {
14               Name      =>   $name,
15               h2z       =>   $h2z,
16               jis0212   =>   $jis0212,
17              } => __PACKAGE__;
18}
19
20use base qw(Encode::Encoding);
21
22# we override this to 1 so PerlIO works
23sub needs_lines { 1 }
24
25use Encode::CJKConstants qw(:all);
26
27#
28# decode is identical for all 2022 variants
29#
30
31sub decode($$;$)
32{
33    my ($obj, $str, $chk) = @_;
34    my $residue = '';
35    if ($chk){
36	$str =~ s/([^\x00-\x7f].*)$//so and $residue = $1;
37    }
38    $residue .= jis_euc(\$str);
39    $_[1] = $residue if $chk;
40    return Encode::decode('euc-jp', $str, FB_PERLQQ);
41}
42
43#
44# encode is different
45#
46
47sub encode($$;$)
48{
49    require Encode::JP::H2Z;
50    my ($obj, $utf8, $chk) = @_;
51    # empty the input string in the stack so perlio is ok
52    $_[1] = '' if $chk;
53    my ($h2z, $jis0212) = @$obj{qw(h2z jis0212)};
54    my $octet = Encode::encode('euc-jp', $utf8, FB_PERLQQ) ;
55    $h2z and &Encode::JP::H2Z::h2z(\$octet);
56    euc_jis(\$octet, $jis0212);
57    return $octet;
58}
59
60#
61# cat_decode
62#
63my $re_scan_jis_g = qr{
64   \G ( ($RE{JIS_0212}) |  $RE{JIS_0208}  |
65        ($RE{ISO_ASC})  | ($RE{JIS_KANA}) | )
66      ([^\e]*)
67}x;
68sub cat_decode { # ($obj, $dst, $src, $pos, $trm, $chk)
69    my ($obj, undef, undef, $pos, $trm) = @_; # currently ignores $chk
70    my ($rdst, $rsrc, $rpos) = \@_[1,2,3];
71    local ${^ENCODING};
72    use bytes;
73    my $opos = pos($$rsrc);
74    pos($$rsrc) = $pos;
75    while ($$rsrc =~ /$re_scan_jis_g/gc) {
76	my ($esc, $esc_0212, $esc_asc, $esc_kana, $chunk) =
77	  ($1, $2, $3, $4, $5);
78
79	unless ($chunk) { $esc or last;  next; }
80
81	if ($esc && !$esc_asc) {
82	    $chunk =~ tr/\x21-\x7e/\xa1-\xfe/;
83	    if ($esc_kana) {
84		$chunk =~ s/([\xa1-\xdf])/\x8e$1/og;
85	    } elsif ($esc_0212) {
86		$chunk =~ s/([\xa1-\xfe][\xa1-\xfe])/\x8f$1/og;
87	    }
88	    $chunk = Encode::decode('euc-jp', $chunk, 0);
89	}
90	elsif ((my $npos = index($chunk, $trm)) >= 0) {
91	    $$rdst .= substr($chunk, 0, $npos + length($trm));
92	    $$rpos += length($esc) + $npos + length($trm);
93	    pos($$rsrc) = $opos;
94	    return 1;
95	}
96	$$rdst .= $chunk;
97	$$rpos = pos($$rsrc);
98    }
99    $$rpos = pos($$rsrc);
100    pos($$rsrc) = $opos;
101    return '';
102}
103
104# JIS<->EUC
105my $re_scan_jis = qr{
106   (?:($RE{JIS_0212})|$RE{JIS_0208}|($RE{ISO_ASC})|($RE{JIS_KANA}))([^\e]*)
107}x;
108
109sub jis_euc {
110    local ${^ENCODING};
111    my $r_str = shift;
112    $$r_str =~ s($re_scan_jis)
113    {
114	my ($esc_0212, $esc_asc, $esc_kana, $chunk) =
115	   ($1, $2, $3, $4);
116	if (!$esc_asc) {
117	    $chunk =~ tr/\x21-\x7e/\xa1-\xfe/;
118	    if ($esc_kana) {
119		$chunk =~ s/([\xa1-\xdf])/\x8e$1/og;
120	    }
121	    elsif ($esc_0212) {
122		$chunk =~ s/([\xa1-\xfe][\xa1-\xfe])/\x8f$1/og;
123	    }
124	}
125	$chunk;
126    }geox;
127    my ($residue) = ($$r_str =~ s/(\e.*)$//so);
128    return $residue;
129}
130
131sub euc_jis{
132    no warnings qw(uninitialized);
133    my $r_str = shift;
134    my $jis0212 = shift;
135    $$r_str =~ s{
136	((?:$RE{EUC_C})+|(?:$RE{EUC_KANA})+|(?:$RE{EUC_0212})+)
137	}{
138	    my $chunk = $1;
139	    my $esc =
140		( $chunk =~ tr/\x8E//d ) ? $ESC{KANA} :
141		    ( $chunk =~ tr/\x8F//d ) ? $ESC{JIS_0212} :
142			$ESC{JIS_0208};
143	    if ($esc eq $ESC{JIS_0212} && !$jis0212){
144		# fallback to '?'
145		$chunk =~ tr/\xA1-\xFE/\x3F/;
146	    }else{
147		$chunk =~ tr/\xA1-\xFE/\x21-\x7E/;
148	    }
149	    $esc . $chunk . $ESC{ASC};
150	}geox;
151    $$r_str =~
152	s/\Q$ESC{ASC}\E
153	    (\Q$ESC{KANA}\E|\Q$ESC{JIS_0212}\E|\Q$ESC{JIS_0208}\E)/$1/gox;
154    $$r_str;
155}
156
1571;
158__END__
159
160
161=head1 NAME
162
163Encode::JP::JIS7 -- internally used by Encode::JP
164
165=cut
166