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author Shoshi TAMAKI <shoshi@cr.ie.u-ryukyu.ac.jp>
date Sun, 06 Jun 2010 22:00:38 +0900
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1 package jcode;
2 ;######################################################################
3 ;#
4 ;# jcode.pl: Perl library for Japanese character code conversion
5 ;#
6 ;# Copyright (c) 1995-1999 Kazumasa Utashiro <utashiro@iij.ad.jp>
7 ;# Internet Initiative Japan Inc.
8 ;# 3-13 Kanda Nishiki-cho, Chiyoda-ku, Tokyo 101-0054, Japan
9 ;#
10 ;# Copyright (c) 1992,1993,1994 Kazumasa Utashiro
11 ;# Software Research Associates, Inc.
12 ;#
13 ;# Use and redistribution for ANY PURPOSE are granted as long as all
14 ;# copyright notices are retained. Redistribution with modification
15 ;# is allowed provided that you make your modified version obviously
16 ;# distinguishable from the original one. THIS SOFTWARE IS PROVIDED
17 ;# BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES ARE
18 ;# DISCLAIMED.
19 ;#
20 ;# Original version was developed under the name of srekcah@sra.co.jp
21 ;# February 1992 and it was called kconv.pl at the beginning. This
22 ;# address was a pen name for group of individuals and it is no longer
23 ;# valid.
24 ;#
25 ;# The latest version is available here:
26 ;#
27 ;# ftp://ftp.iij.ad.jp/pub/IIJ/dist/utashiro/perl/
28 ;#
29 ;; $rcsid = q$Id: jcode.pl,v 2.11 1999/12/26 17:16:47 utashiro Exp $;
30 ;#
31 ;######################################################################
32 ;#
33 ;# PERL4 INTERFACE:
34 ;#
35 ;# &jcode'getcode(*line)
36 ;# Return 'jis', 'sjis', 'euc' or undef according to
37 ;# Japanese character code in $line. Return 'binary' if
38 ;# the data has non-character code.
39 ;#
40 ;# When evaluated in array context, it returns a list
41 ;# contains two items. First value is the number of
42 ;# characters which matched to the expected code, and
43 ;# second value is the code name. It is useful if and
44 ;# only if the number is not 0 and the code is undef;
45 ;# that case means it couldn't tell 'euc' or 'sjis'
46 ;# because the evaluation score was exactly same. This
47 ;# interface is too tricky, though.
48 ;#
49 ;# Code detection between euc and sjis is very difficult
50 ;# or sometimes impossible or even lead to wrong result
51 ;# when it includes JIS X0201 KANA characters. So JIS
52 ;# X0201 KANA is ignored for automatic code detection.
53 ;#
54 ;# &jcode'convert(*line, $ocode [, $icode [, $option]])
55 ;# Convert the contents of $line to the specified
56 ;# Japanese code given in the second argument $ocode.
57 ;# $ocode can be any of "jis", "sjis" or "euc", or use
58 ;# "noconv" when you don't want the code conversion.
59 ;# Input code is recognized automatically from the line
60 ;# itself when $icode is not supplied (JIS X0201 KANA is
61 ;# ignored in code detection. See the above descripton
62 ;# of &getcode). $icode also can be specified, but
63 ;# xxx2yyy routine is more efficient when both codes are
64 ;# known.
65 ;#
66 ;# It returns the code of input string in scalar context,
67 ;# and a list of pointer of convert subroutine and the
68 ;# input code in array context.
69 ;#
70 ;# Japanese character code JIS X0201, X0208, X0212 and
71 ;# ASCII code are supported. X0212 characters can not be
72 ;# represented in SJIS and they will be replased by
73 ;# "geta" character when converted to SJIS.
74 ;#
75 ;# See next paragraph for $option parameter.
76 ;#
77 ;# &jcode'xxx2yyy(*line [, $option])
78 ;# Convert the Japanese code from xxx to yyy. String xxx
79 ;# and yyy are any convination from "jis", "euc" or
80 ;# "sjis". They return *approximate* number of converted
81 ;# bytes. So return value 0 means the line was not
82 ;# converted at all.
83 ;#
84 ;# Optional parameter $option is used to specify optional
85 ;# conversion method. String "z" is for JIS X0201 KANA
86 ;# to X0208 KANA, and "h" is for reverse.
87 ;#
88 ;# $jcode'convf{'xxx', 'yyy'}
89 ;# The value of this associative array is pointer to the
90 ;# subroutine jcode'xxx2yyy().
91 ;#
92 ;# &jcode'to($ocode, $line [, $icode [, $option]])
93 ;# &jcode'jis($line [, $icode [, $option]])
94 ;# &jcode'euc($line [, $icode [, $option]])
95 ;# &jcode'sjis($line [, $icode [, $option]])
96 ;# These functions are prepared for easy use of
97 ;# call/return-by-value interface. You can use these
98 ;# funcitons in s///e operation or any other place for
99 ;# convenience.
100 ;#
101 ;# &jcode'jis_inout($in, $out)
102 ;# Set or inquire JIS start and end sequences. Default
103 ;# is "ESC-$-B" and "ESC-(-B". If you supplied only one
104 ;# character, "ESC-$" or "ESC-(" is prepended for each
105 ;# character respectively. Acutually "ESC-(-B" is not a
106 ;# sequence to end JIS code but a sequence to start ASCII
107 ;# code set. So `in' and `out' are somewhat misleading.
108 ;#
109 ;# &jcode'get_inout($string)
110 ;# Get JIS start and end sequences from $string.
111 ;#
112 ;# &jcode'cache()
113 ;# &jcode'nocache()
114 ;# &jcode'flush()
115 ;# Usually, converted character is cached in memory to
116 ;# avoid same calculations have to be done many times.
117 ;# To disable this caching, call &jcode'nocache(). It
118 ;# can be revived by &jcode'cache() and cache is flushed
119 ;# by calling &jcode'flush(). &cache() and &nocache()
120 ;# functions return previous caching state.
121 ;#
122 ;# ---------------------------------------------------------------
123 ;#
124 ;# &jcode'h2z_xxx(*line)
125 ;# JIS X0201 KANA (so-called Hankaku-KANA) to X0208 KANA
126 ;# (Zenkaku-KANA) code conversion routine. String xxx is
127 ;# any of "jis", "sjis" and "euc". From the difficulty
128 ;# of recognizing code set from 1-byte KATAKANA string,
129 ;# automatic code recognition is not supported.
130 ;#
131 ;# &jcode'z2h_xxx(*line)
132 ;# X0208 to X0201 KANA code conversion routine. String
133 ;# xxx is any of "jis", "sjis" and "euc".
134 ;#
135 ;# $jcode'z2hf{'xxx'}
136 ;# $jcode'h2zf{'xxx'}
137 ;# These are pointer to the corresponding function just
138 ;# as $jcode'convf.
139 ;#
140 ;# ---------------------------------------------------------------
141 ;#
142 ;# &jcode'tr(*line, $from, $to [, $option])
143 ;# &jcode'tr emulates tr operator for 2 byte code. Only 'd'
144 ;# is interpreted as an option.
145 ;#
146 ;# Range operator like `A-Z' for 2 byte code is partially
147 ;# supported. Code must be JIS or EUC, and first byte
148 ;# have to be same on first and last character.
149 ;#
150 ;# CAUTION: Handling range operator is a kind of trick
151 ;# and it is not perfect. So if you need to transfer `-'
152 ;# character, please be sure to put it at the beginning
153 ;# or the end of $from and $to strings.
154 ;#
155 ;# &jcode'trans($line, $from, $to [, $option)
156 ;# Same as &jcode'tr but accept string and return string
157 ;# after translation.
158 ;#
159 ;# ---------------------------------------------------------------
160 ;#
161 ;# &jcode'init()
162 ;# Initialize the variables used in this package. You
163 ;# don't have to call this when using jocde.pl by `do' or
164 ;# `require' interface. Call it first if you embedded
165 ;# the jcode.pl at the end of your script.
166 ;#
167 ;######################################################################
168 ;#
169 ;# PERL5 INTERFACE:
170 ;#
171 ;# Current jcode.pl is written in Perl 4 but it is possible to use
172 ;# from Perl 5 using `references'. Fully perl5 capable version is
173 ;# future issue.
174 ;#
175 ;# Since lexical variable is not a subject of typeglob, *string style
176 ;# call doesn't work if the variable is declared as `my'. Same thing
177 ;# happens to special variable $_ if the perl is compiled to use
178 ;# thread capability. So using reference is generally recommented to
179 ;# avoid the mysterious error.
180 ;#
181 ;# jcode::getcode(\$line)
182 ;# jcode::convert(\$line, $ocode [, $icode [, $option]])
183 ;# jcode::xxx2yyy(\$line [, $option])
184 ;# &{$jcode::convf{'xxx', 'yyy'}}(\$line)
185 ;# jcode::to($ocode, $line [, $icode [, $option]])
186 ;# jcode::jis($line [, $icode [, $option]])
187 ;# jcode::euc($line [, $icode [, $option]])
188 ;# jcode::sjis($line [, $icode [, $option]])
189 ;# jcode::jis_inout($in, $out)
190 ;# jcode::get_inout($string)
191 ;# jcode::cache()
192 ;# jcode::nocache()
193 ;# jcode::flush()
194 ;# jcode::h2z_xxx(\$line)
195 ;# jcode::z2h_xxx(\$line)
196 ;# &{$jcode::z2hf{'xxx'}}(\$line)
197 ;# &{$jcode::h2zf{'xxx'}}(\$line)
198 ;# jcode::tr(\$line, $from, $to [, $option])
199 ;# jcode::trans($line, $from, $to [, $option)
200 ;# jcode::init()
201 ;#
202 ;######################################################################
203 ;#
204 ;# SAMPLES
205 ;#
206 ;# Convert any Kanji code to JIS and print each line with code name.
207 ;#
208 ;# while (defined($s = <>)) {
209 ;# $code = &jcode'convert(*s, 'jis');
210 ;# print $code, "\t", $s;
211 ;# }
212 ;#
213 ;# Convert all lines to JIS according to the first recognized line.
214 ;#
215 ;# while (defined($s = <>)) {
216 ;# print, next unless $s =~ /[\033\200-\377]/;
217 ;# (*f, $icode) = &jcode'convert(*s, 'jis');
218 ;# print;
219 ;# defined(&f) || next;
220 ;# while (<>) { &f(*s); print; }
221 ;# last;
222 ;# }
223 ;#
224 ;# The safest way of JIS conversion.
225 ;#
226 ;# while (defined($s = <>)) {
227 ;# ($matched, $icode) = &jcode'getcode(*s);
228 ;# if (@buf == 0 && $matched == 0) {
229 ;# print $s;
230 ;# next;
231 ;# }
232 ;# push(@buf, $s);
233 ;# next unless $icode;
234 ;# while (defined($s = shift(@buf))) {
235 ;# &jcode'convert(*s, 'jis', $icode);
236 ;# print $s;
237 ;# }
238 ;# while (defined($s = <>)) {
239 ;# &jcode'convert(*s, 'jis', $icode);
240 ;# print $s;
241 ;# }
242 ;# last;
243 ;# }
244 ;# print @buf if @buf;
245 ;#
246 ;######################################################################
247
248 ;#
249 ;# Call initialize function if it is not called yet. This may sound
250 ;# strange but it makes easy to embed the jcode.pl at the end of
251 ;# script. Call &jcode'init at the beginning of the script in that
252 ;# case.
253 ;#
254 &init unless defined $version;
255
256 ;#
257 ;# Initialize variables.
258 ;#
259 sub init {
260 $version = $rcsid =~ /,v ([\d.]+)/ ? $1 : 'unkown';
261
262 $re_bin = '[\000-\006\177\377]';
263
264 $re_jis0208_1978 = '\e\$\@';
265 $re_jis0208_1983 = '\e\$B';
266 $re_jis0208_1990 = '\e&\@\e\$B';
267 $re_jis0208 = "$re_jis0208_1978|$re_jis0208_1983|$re_jis0208_1990";
268 $re_jis0212 = '\e\$\(D';
269 $re_jp = "$re_jis0208|$re_jis0212";
270 $re_asc = '\e\([BJ]';
271 $re_kana = '\e\(I';
272
273 $esc_0208 = "\e\$B";
274 $esc_0212 = "\e\$(D";
275 $esc_asc = "\e(B";
276 $esc_kana = "\e(I";
277
278 $re_sjis_c = '[\201-\237\340-\374][\100-\176\200-\374]';
279 $re_sjis_kana = '[\241-\337]';
280
281 $re_euc_c = '[\241-\376][\241-\376]';
282 $re_euc_kana = '\216[\241-\337]';
283 $re_euc_0212 = '\217[\241-\376][\241-\376]';
284
285 # Use `geta' for undefined character code
286 $undef_sjis = "\x81\xac";
287
288 $cache = 1;
289
290 # X0201 -> X0208 KANA conversion table. Looks weird? Not that
291 # much. This is simply JIS text without escape sequences.
292 ($h2z_high = $h2z = <<'__TABLE_END__') =~ tr/\041-\176/\241-\376/;
293 ! !# $ !" % !& " !V # !W
294 ^ !+ _ !, 0 !<
295 ' %! ( %# ) %% * %' + %)
296 , %c - %e . %g / %C
297 1 %" 2 %$ 3 %& 4 %( 5 %*
298 6 %+ 7 %- 8 %/ 9 %1 : %3
299 6^ %, 7^ %. 8^ %0 9^ %2 :^ %4
300 ; %5 < %7 = %9 > %; ? %=
301 ;^ %6 <^ %8 =^ %: >^ %< ?^ %>
302 @ %? A %A B %D C %F D %H
303 @^ %@ A^ %B B^ %E C^ %G D^ %I
304 E %J F %K G %L H %M I %N
305 J %O K %R L %U M %X N %[
306 J^ %P K^ %S L^ %V M^ %Y N^ %\
307 J_ %Q K_ %T L_ %W M_ %Z N_ %]
308 O %^ P %_ Q %` R %a S %b
309 T %d U %f V %h
310 W %i X %j Y %k Z %l [ %m
311 \ %o ] %s & %r 3^ %t
312 __TABLE_END__
313 %h2z = split(/\s+/, $h2z . $h2z_high);
314 %z2h = reverse %h2z;
315
316 $convf{'jis' , 'jis' } = *jis2jis;
317 $convf{'jis' , 'sjis'} = *jis2sjis;
318 $convf{'jis' , 'euc' } = *jis2euc;
319 $convf{'euc' , 'jis' } = *euc2jis;
320 $convf{'euc' , 'sjis'} = *euc2sjis;
321 $convf{'euc' , 'euc' } = *euc2euc;
322 $convf{'sjis' , 'jis' } = *sjis2jis;
323 $convf{'sjis' , 'sjis'} = *sjis2sjis;
324 $convf{'sjis' , 'euc' } = *sjis2euc;
325 $h2zf{'jis' } = *h2z_jis;
326 $z2hf{'jis' } = *z2h_jis;
327 $h2zf{'euc' } = *h2z_euc;
328 $z2hf{'euc' } = *z2h_euc;
329 $h2zf{'sjis'} = *h2z_sjis;
330 $z2hf{'sjis'} = *z2h_sjis;
331 }
332
333 ;#
334 ;# Set escape sequences which should be put before and after Japanese
335 ;# (JIS X0208) string.
336 ;#
337 sub jis_inout {
338 $esc_0208 = shift || $esc_0208;
339 $esc_0208 = "\e\$$esc_0208" if length($esc_0208) == 1;
340 $esc_asc = shift || $esc_asc;
341 $esc_asc = "\e\($esc_asc" if length($esc_asc) == 1;
342 ($esc_0208, $esc_asc);
343 }
344
345 ;#
346 ;# Get JIS in and out sequences from the string.
347 ;#
348 sub get_inout {
349 local($esc_0208, $esc_asc);
350 $_[$[] =~ /($re_jis0208)/o && ($esc_0208 = $1);
351 $_[$[] =~ /($re_asc)/o && ($esc_asc = $1);
352 ($esc_0208, $esc_asc);
353 }
354
355 ;#
356 ;# Recognize character code.
357 ;#
358 sub getcode {
359 local(*s) = @_;
360 local($matched, $code);
361
362 if ($s !~ /[\e\200-\377]/) { # not Japanese
363 $matched = 0;
364 $code = undef;
365 } # 'jis'
366 elsif ($s =~ /$re_jp|$re_asc|$re_kana/o) {
367 $matched = 1;
368 $code = 'jis';
369 }
370 elsif ($s =~ /$re_bin/o) { # 'binary'
371 $matched = 0;
372 $code = 'binary';
373 }
374 else { # should be 'euc' or 'sjis'
375 local($sjis, $euc) = (0, 0);
376
377 while ($s =~ /(($re_sjis_c)+)/go) {
378 $sjis += length($1);
379 }
380 while ($s =~ /(($re_euc_c|$re_euc_kana|$re_euc_0212)+)/go) {
381 $euc += length($1);
382 }
383 $matched = &max($sjis, $euc);
384 $code = ('euc', undef, 'sjis')[($sjis<=>$euc) + $[ + 1];
385 }
386 wantarray ? ($matched, $code) : $code;
387 }
388 sub max { $_[ $[ + ($_[ $[ ] < $_[ $[ + 1 ]) ]; }
389
390 ;#
391 ;# Convert any code to specified code.
392 ;#
393 sub convert {
394 local(*s, $ocode, $icode, $opt) = @_;
395 return (undef, undef) unless $icode = $icode || &getcode(*s);
396 return (undef, $icode) if $icode eq 'binary';
397 $ocode = 'jis' unless $ocode;
398 $ocode = $icode if $ocode eq 'noconv';
399 local(*f) = $convf{$icode, $ocode};
400 &f(*s, $opt);
401 wantarray ? (*f, $icode) : $icode;
402 }
403
404 ;#
405 ;# Easy return-by-value interfaces.
406 ;#
407 sub jis { &to('jis', @_); }
408 sub euc { &to('euc', @_); }
409 sub sjis { &to('sjis', @_); }
410 sub to {
411 local($ocode, $s, $icode, $opt) = @_;
412 &convert(*s, $ocode, $icode, $opt);
413 $s;
414 }
415 sub what {
416 local($s) = @_;
417 &getcode(*s);
418 }
419 sub trans {
420 local($s) = shift;
421 &tr(*s, @_);
422 $s;
423 }
424
425 ;#
426 ;# SJIS to JIS
427 ;#
428 sub sjis2jis {
429 local(*s, $opt, $n) = @_;
430 &sjis2sjis(*s, $opt) if $opt;
431 $s =~ s/(($re_sjis_c|$re_sjis_kana)+)/&_sjis2jis($1) . $esc_asc/geo;
432 $n;
433 }
434 sub _sjis2jis {
435 local($s) = shift;
436 $s =~ s/(($re_sjis_c)+|($re_sjis_kana)+)/&__sjis2jis($1)/geo;
437 $s;
438 }
439 sub __sjis2jis {
440 local($s) = shift;
441 if ($s =~ /^$re_sjis_kana/o) {
442 $n += $s =~ tr/\241-\337/\041-\137/;
443 $esc_kana . $s;
444 } else {
445 $n += $s =~ s/($re_sjis_c)/$s2e{$1}||&s2e($1)/geo;
446 $s =~ tr/\241-\376/\041-\176/;
447 $esc_0208 . $s;
448 }
449 }
450
451 ;#
452 ;# EUC to JIS
453 ;#
454 sub euc2jis {
455 local(*s, $opt, $n) = @_;
456 &euc2euc(*s, $opt) if $opt;
457 $s =~ s/(($re_euc_c|$re_euc_kana|$re_euc_0212)+)/
458 &_euc2jis($1) . $esc_asc
459 /geo;
460 $n;
461 }
462 sub _euc2jis {
463 local($s) = shift;
464 $s =~ s/(($re_euc_c)+|($re_euc_kana)+|($re_euc_0212)+)/&__euc2jis($1)/geo;
465 $s;
466 }
467 sub __euc2jis {
468 local($s) = shift;
469 local($esc);
470
471 if ($s =~ tr/\216//d) {
472 $esc = $esc_kana;
473 } elsif ($s =~ tr/\217//d) {
474 $esc = $esc_0212;
475 } else {
476 $esc = $esc_0208;
477 }
478
479 $n += $s =~ tr/\241-\376/\041-\176/;
480 $esc . $s;
481 }
482
483 ;#
484 ;# JIS to EUC
485 ;#
486 sub jis2euc {
487 local(*s, $opt, $n) = @_;
488 $s =~ s/($re_jp|$re_asc|$re_kana)([^\e]*)/&_jis2euc($1,$2)/geo;
489 &euc2euc(*s, $opt) if $opt;
490 $n;
491 }
492 sub _jis2euc {
493 local($esc, $s) = @_;
494 if ($esc !~ /^$re_asc/o) {
495 $n += $s =~ tr/\041-\176/\241-\376/;
496 if ($esc =~ /^$re_kana/o) {
497 $s =~ s/([\241-\337])/\216$1/g;
498 }
499 elsif ($esc =~ /^$re_jis0212/o) {
500 $s =~ s/([\241-\376][\241-\376])/\217$1/g;
501 }
502 }
503 $s;
504 }
505
506 ;#
507 ;# JIS to SJIS
508 ;#
509 sub jis2sjis {
510 local(*s, $opt, $n) = @_;
511 &jis2jis(*s, $opt) if $opt;
512 $s =~ s/($re_jp|$re_asc|$re_kana)([^\e]*)/&_jis2sjis($1,$2)/geo;
513 $n;
514 }
515 sub _jis2sjis {
516 local($esc, $s) = @_;
517 if ($esc =~ /^$re_jis0212/o) {
518 $s =~ s/../$undef_sjis/g;
519 $n = length;
520 }
521 elsif ($esc !~ /^$re_asc/o) {
522 $n += $s =~ tr/\041-\176/\241-\376/;
523 if ($esc =~ /^$re_jp/o) {
524 $s =~ s/($re_euc_c)/$e2s{$1}||&e2s($1)/geo;
525 }
526 }
527 $s;
528 }
529
530 ;#
531 ;# SJIS to EUC
532 ;#
533 sub sjis2euc {
534 local(*s, $opt,$n) = @_;
535 $n = $s =~ s/($re_sjis_c|$re_sjis_kana)/$s2e{$1}||&s2e($1)/geo;
536 &euc2euc(*s, $opt) if $opt;
537 $n;
538 }
539 sub s2e {
540 local($c1, $c2, $code);
541 ($c1, $c2) = unpack('CC', $code = shift);
542
543 if (0xa1 <= $c1 && $c1 <= 0xdf) {
544 $c2 = $c1;
545 $c1 = 0x8e;
546 } elsif (0x9f <= $c2) {
547 $c1 = $c1 * 2 - ($c1 >= 0xe0 ? 0xe0 : 0x60);
548 $c2 += 2;
549 } else {
550 $c1 = $c1 * 2 - ($c1 >= 0xe0 ? 0xe1 : 0x61);
551 $c2 += 0x60 + ($c2 < 0x7f);
552 }
553 if ($cache) {
554 $s2e{$code} = pack('CC', $c1, $c2);
555 } else {
556 pack('CC', $c1, $c2);
557 }
558 }
559
560 ;#
561 ;# EUC to SJIS
562 ;#
563 sub euc2sjis {
564 local(*s, $opt,$n) = @_;
565 &euc2euc(*s, $opt) if $opt;
566 $n = $s =~ s/($re_euc_c|$re_euc_kana|$re_euc_0212)/$e2s{$1}||&e2s($1)/geo;
567 }
568 sub e2s {
569 local($c1, $c2, $code);
570 ($c1, $c2) = unpack('CC', $code = shift);
571
572 if ($c1 == 0x8e) { # SS2
573 return substr($code, 1, 1);
574 } elsif ($c1 == 0x8f) { # SS3
575 return $undef_sjis;
576 } elsif ($c1 % 2) {
577 $c1 = ($c1>>1) + ($c1 < 0xdf ? 0x31 : 0x71);
578 $c2 -= 0x60 + ($c2 < 0xe0);
579 } else {
580 $c1 = ($c1>>1) + ($c1 < 0xdf ? 0x30 : 0x70);
581 $c2 -= 2;
582 }
583 if ($cache) {
584 $e2s{$code} = pack('CC', $c1, $c2);
585 } else {
586 pack('CC', $c1, $c2);
587 }
588 }
589
590 ;#
591 ;# JIS to JIS, SJIS to SJIS, EUC to EUC
592 ;#
593 sub jis2jis {
594 local(*s, $opt) = @_;
595 $s =~ s/$re_jis0208/$esc_0208/go;
596 $s =~ s/$re_asc/$esc_asc/go;
597 &h2z_jis(*s) if $opt =~ /z/;
598 &z2h_jis(*s) if $opt =~ /h/;
599 }
600 sub sjis2sjis {
601 local(*s, $opt) = @_;
602 &h2z_sjis(*s) if $opt =~ /z/;
603 &z2h_sjis(*s) if $opt =~ /h/;
604 }
605 sub euc2euc {
606 local(*s, $opt) = @_;
607 &h2z_euc(*s) if $opt =~ /z/;
608 &z2h_euc(*s) if $opt =~ /h/;
609 }
610
611 ;#
612 ;# Cache control functions
613 ;#
614 sub cache {
615 ($cache, $cache = 1)[$[];
616 }
617 sub nocache {
618 ($cache, $cache = 0)[$[];
619 }
620 sub flushcache {
621 undef %e2s;
622 undef %s2e;
623 }
624
625 ;#
626 ;# X0201 -> X0208 KANA conversion routine
627 ;#
628 sub h2z_jis {
629 local(*s, $n) = @_;
630 if ($s =~ s/$re_kana([^\e]*)/$esc_0208 . &_h2z_jis($1)/geo) {
631 1 while $s =~ s/(($re_jis0208)[^\e]*)($re_jis0208)/$1/o;
632 }
633 $n;
634 }
635 sub _h2z_jis {
636 local($s) = @_;
637 $n += $s =~ s/([\41-\137]([\136\137])?)/$h2z{$1}/g;
638 $s;
639 }
640
641 sub h2z_euc {
642 local(*s) = @_;
643 $s =~ s/\216([\241-\337])(\216([\336\337]))?/$h2z{"$1$3"}/g;
644 }
645
646 sub h2z_sjis {
647 local(*s, $n) = @_;
648 $s =~ s/(($re_sjis_c)+)|(([\241-\337])([\336\337])?)/
649 $1 || ($n++, $e2s{$h2z{$3}} || &e2s($h2z{$3}))
650 /geo;
651 $n;
652 }
653
654 ;#
655 ;# X0208 -> X0201 KANA conversion routine
656 ;#
657 sub z2h_jis {
658 local(*s, $n) = @_;
659 $s =~ s/($re_jis0208)([^\e]+)/&_z2h_jis($2)/geo;
660 $n;
661 }
662 sub _z2h_jis {
663 local($s) = @_;
664 $s =~ s/((\%[!-~]|![\#\"&VW+,<])+|([^!%][!-~]|![^\#\"&VW+,<])+)/
665 &__z2h_jis($1)
666 /ge;
667 $s;
668 }
669 sub __z2h_jis {
670 local($s) = @_;
671 return $esc_0208 . $s unless /^%/ || $s =~ /^![\#\"&VW+,<]/;
672 $n += length($s) / 2;
673 $s =~ s/(..)/$z2h{$1}/g;
674 $esc_kana . $s;
675 }
676
677 sub z2h_euc {
678 local(*s, $n) = @_;
679 &init_z2h_euc unless defined %z2h_euc;
680 $s =~ s/($re_euc_c|$re_euc_kana)/
681 $z2h_euc{$1} ? ($n++, $z2h_euc{$1}) : $1
682 /geo;
683 $n;
684 }
685
686 sub z2h_sjis {
687 local(*s, $n) = @_;
688 &init_z2h_sjis unless defined %z2h_sjis;
689 $s =~ s/($re_sjis_c)/$z2h_sjis{$1} ? ($n++, $z2h_sjis{$1}) : $1/geo;
690 $n;
691 }
692
693 ;#
694 ;# Initializing JIS X0208 to X0201 KANA table for EUC and SJIS. This
695 ;# can be done in &init but it's not worth doing. Similarly,
696 ;# precalculated table is not worth to occupy the file space and
697 ;# reduce the readability. The author personnaly discourages to use
698 ;# X0201 Kana character in the any situation.
699 ;#
700 sub init_z2h_euc {
701 local($k, $s);
702 while (($k, $s) = each %z2h) {
703 $s =~ s/([\241-\337])/\216$1/g && ($z2h_euc{$k} = $s);
704 }
705 }
706 sub init_z2h_sjis {
707 local($s, $v);
708 while (($s, $v) = each %z2h) {
709 $s =~ /[\200-\377]/ && ($z2h_sjis{&e2s($s)} = $v);
710 }
711 }
712
713 ;#
714 ;# TR function for 2-byte code
715 ;#
716 sub tr {
717 # $prev_from, $prev_to, %table are persistent variables
718 local(*s, $from, $to, $opt) = @_;
719 local(@from, @to);
720 local($jis, $n) = (0, 0);
721
722 $jis++, &jis2euc(*s) if $s =~ /$re_jp|$re_asc|$re_kana/o;
723 $jis++ if $to =~ /$re_jp|$re_asc|$re_kana/o;
724
725 if (!defined($prev_from) || $from ne $prev_from || $to ne $prev_to) {
726 ($prev_from, $prev_to) = ($from, $to);
727 undef %table;
728 &_maketable;
729 }
730
731 $s =~ s/([\200-\377][\000-\377]|[\000-\377])/
732 defined($table{$1}) && ++$n ? $table{$1} : $1
733 /ge;
734
735 &euc2jis(*s) if $jis;
736
737 $n;
738 }
739
740 sub _maketable {
741 local($ascii) = '(\\\\[\\-\\\\]|[\0-\133\135-\177])';
742
743 &jis2euc(*to) if $to =~ /$re_jp|$re_asc|$re_kana/o;
744 &jis2euc(*from) if $from =~ /$re_jp|$re_asc|$re_kana/o;
745
746 grep(s/(([\200-\377])[\200-\377]-\2[\200-\377])/&_expnd2($1)/ge,
747 $from, $to);
748 grep(s/($ascii-$ascii)/&_expnd1($1)/geo,
749 $from, $to);
750
751 @to = $to =~ /[\200-\377][\000-\377]|[\000-\377]/g;
752 @from = $from =~ /[\200-\377][\000-\377]|[\000-\377]/g;
753 push(@to, ($opt =~ /d/ ? '' : $to[$#to]) x (@from - @to)) if @to < @from;
754 @table{@from} = @to;
755 }
756
757 sub _expnd1 {
758 local($s) = @_;
759 $s =~ s/\\(.)/$1/g;
760 local($c1, $c2) = unpack('CxC', $s);
761 if ($c1 <= $c2) {
762 for ($s = ''; $c1 <= $c2; $c1++) {
763 $s .= pack('C', $c1);
764 }
765 }
766 $s;
767 }
768
769 sub _expnd2 {
770 local($s) = @_;
771 local($c1, $c2, $c3, $c4) = unpack('CCxCC', $s);
772 if ($c1 == $c3 && $c2 <= $c4) {
773 for ($s = ''; $c2 <= $c4; $c2++) {
774 $s .= pack('CC', $c1, $c2);
775 }
776 }
777 $s;
778 }
779
780 1;