package jcode; ;###################################################################### ;# ;# jcode.pl: Perl library for Japanese character code conversion ;# ;# Copyright (c) 1995,1996,1997 Kazumasa Utashiro ;# Internet Initiative Japan Inc. ;# 1-4 Sanban-cho, Chiyoda-ku, Tokyo 102, Japan ;# ;# Copyright (c) 1992,1993,1994 Kazumasa Utashiro ;# Software Research Associates, Inc. ;# ;# Original version was developed under the name of srekcah@sra.co.jp ;# February 1992 and it was called kconv.pl at the beginning. This ;# address was a pen name for group of individuals and it is no longer ;# valid. ;# ;# Use and redistribution for any purpose, without significant ;# modification, is granted as long as all copyright notices are ;# retained. THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ;# ANY EXPRESS OR IMPLIED WARRANTIES ARE DISCLAIMED. ;# ;; $rcsid = q$Id: jcode.pl,v 2.3 1997/02/23 14:12:26 utashiro Exp $; ;# ;###################################################################### ;# ;# INTERFACE: ;# ;# &jcode'getcode(*line) ;# Return 'jis', 'sjis', 'euc' or undef according to ;# Japanese character code in $line. Return 'binary' if ;# the data has non-character code. ;# ;# Code detection between euc and sjis is very difficult ;# or sometimes impossible or even lead to wrong result ;# when it's include JIS X0201 KANA characters. So JIS ;# X0201 KANA is ignored for automatic code detection. ;# ;# &jcode'convert(*line, $ocode [, $icode [, $option]]) ;# Convert the line in any Japanese code to the specified ;# code in the second argument $ocode. $ocode can be any ;# of "jis", "sjis" or "euc", or use "noconv" when you ;# don't want the code conversion. Input code is ;# recognized automatically from the line itself when ;# $icode is not supplied (JIS X0201 KANA is ignored. ;# See above). $icode also can be specified, but xxx2yyy ;# routine is more efficient when both codes are known. ;# ;# It returns a list of pointer of convert subroutine and ;# input code. It means that this routine returns the ;# input code of the line in scalar context. ;# ;# See next paragraph for $option parameter. ;# ;# &jcode'xxx2yyy(*line [, $option]) ;# Convert the Japanese code from xxx to yyy. String xxx ;# and yyy are any convination from "jis", "euc" or ;# "sjis". They return *approximate* number of converted ;# bytes. So return value 0 means the line was not ;# converted at all. ;# ;# Optional parameter $option is used to specify optional ;# conversion method. String "z" is for JIS X0201 KANA ;# to X0208 KANA, and "h" is for reverse. ;# ;# $jcode'convf{'xxx', 'yyy'} ;# The value of this associative array is pointer to the ;# subroutine jcode'xxx2yyy(). ;# ;# &jcode'to($ocode, $line [, $icode [, $option]]) ;# &jcode'jis($line [, $icode [, $option]]) ;# &jcode'euc($line [, $icode [, $option]]) ;# &jcode'sjis($line [, $icode [, $option]]) ;# These functions are prepared for easy use of ;# call/return-by-value interface. You can use these ;# funcitons in s///e operation or any other place for ;# convenience. ;# ;# &jcode'jis_inout($in, $out) ;# Set or inquire JIS start and end sequences. Default ;# is "ESC-$-B" and "ESC-(-B". If you supplied only one ;# character, "ESC-$" or "ESC-(" is added as a prefix ;# for each character respectively. Acutually "ESC-(-B" ;# is not a sequence to end JIS code but a sequence to ;# start ASCII code set. So `in' and `out' are somewhat ;# misleading. ;# ;# &jcode'get_inout($string) ;# Get JIS start and end sequences from $string. ;# ;# &jcode'cache() ;# &jcode'nocache() ;# &jcode'flush() ;# Usually, converted character is cached in memory to ;# avoid same calculations have to be done many times. ;# To disable this caching, call &jcode'nocache(). It ;# can be revived by &jcode'cache() and cache is flushed ;# by calling &jcode'flush(). &cache() and &nocache() ;# functions return previous caching state. ;# ;# --------------------------------------------------------------- ;# ;# &jcode'h2z_xxx(*line); ;# JIS X0201 KANA (so-called Hankaku-KANA) to X0208 KANA ;# (Zenkaku-KANA) code conversion routine. String xxx is ;# any of "jis", "sjis" and "euc". From the difficulty ;# of recognizing code set from 1-byte KATAKANA string, ;# automatic code recognition is not supported. ;# ;# &jcode'z2h_xxx(*line); ;# X0208 to X0201 KANA code conversion routine. String ;# xxx is any of "jis", "sjis" and "euc". ;# ;# $jcode'z2hf{'xxx'} ;# $jcode'h2zf{'xxx'} ;# These are pointer to the corresponding function just ;# as $jcode'convf. ;# ;# --------------------------------------------------------------- ;# ;# &jcode'tr(*line, $from, $to [, $option]); ;# &jcode'tr emulates tr operator for 2 byte code. Only 'd' ;# is interpreted as option. ;# ;# Range operator like `A-Z' for 2 byte code is partially ;# supported. Code must be JIS or EUC, and first byte ;# should be same on first and last character. ;# ;# CAUTION: Handling range operator is a kind of trick ;# and it is not perfect. So if you need to transfer `-' ;# character, please be sure to put it at the beginning ;# or the end of $from and $to strings. ;# ;# &jcode'trans($line, $from, $to [, $option); ;# Same as &jcode'tr but accept string and return string ;# after translation. ;# ;# --------------------------------------------------------------- ;# ;# &jcode'init() ;# Initialize the variables used in other functions. You ;# don't have to call this when using jocde.pl by do or ;# require. Call it first if you embedded the jcode.pl ;# in your script. ;# ;###################################################################### ;# ;# SAMPLES ;# ;# Convert any Kanji code to JIS and print each line with code name. ;# ;# while (<>) { ;# $code = &jcode'convert(*_, 'jis'); ;# print $code, "\t", $_; ;# } ;# ;# Convert all lines to JIS according to the first recognized line. ;# ;# while (<>) { ;# print, next unless /[\033\200-\377]/; ;# (*f, $icode) = &jcode'convert(*_, 'jis'); ;# print; ;# defined(&f) || next; ;# while (<>) { &f(*_); print; } ;# last; ;# } ;# ;# The safest way of JIS conversion. ;# ;# while (<>) { ;# ($matched, $code) = &jcode'getcode(*_); ;# print, next unless (@buf || $matched); ;# push(@readahead, $_); ;# next unless $code; ;# eval "&jcode'${code}2jis(*_), print while (\$_ = shift(\@buf));"; ;# eval "&jcode'${code}2jis(*_), print while (\$_ = <>);"; ;# last; ;# } ;# ;###################################################################### ;# ;# Call initialize function if it is not called yet. This may sound ;# strange but it makes easy to embed the jcode.pl at the end of ;# script. Call &jcode'init at the beginning of the script in that ;# case. ;# &init unless defined $version; ;# ;# Initialize variables. ;# sub init { $version = $rcsid =~ /,v ([\d.]+)/ ? $1 : 'unkown'; $re_bin = '[\000-\006\177\377]'; $re_jp = '\e\$[\@B]'; $re_asc = '\e\([BJ]'; $re_kana = '\e\(I'; ($esc_jp, $esc_asc, $esc_kana) = ("\e\$B", "\e(B", "\e(I"); $re_sjis_c = '[\201-\237\340-\374][\100-\176\200-\374]'; $re_sjis_kana = '[\241-\337]'; $re_euc_c = '[\241-\376][\241-\376]'; $re_euc_kana = '\216[\241-\337]'; # These variables are retained only for backward compatibility. $re_euc_s = "($re_euc_c)+"; $re_sjis_s = "($re_sjis_c)+"; $cache = 1; # X0201 -> X0208 KANA conversion table. Looks weird? Not that # much. This is simply JIS text without escape sequences. ($h2z_high = $h2z = <<'__TABLE_END__') =~ tr/\021-\176/\221-\376/; ! !# $ !" % !& " !V # !W ^ !+ _ !, 0 !< ' %! ( %# ) %% * %' + %) , %c - %e . %g / %C 1 %" 2 %$ 3 %& 4 %( 5 %* 6 %+ 7 %- 8 %/ 9 %1 : %3 6^ %, 7^ %. 8^ %0 9^ %2 :^ %4 ; %5 < %7 = %9 > %; ? %= ;^ %6 <^ %8 =^ %: >^ %< ?^ %> @ %? A %A B %D C %F D %H @^ %@ A^ %B B^ %E C^ %G D^ %I E %J F %K G %L H %M I %N J %O K %R L %U M %X N %[ J^ %P K^ %S L^ %V M^ %Y N^ %\ J_ %Q K_ %T L_ %W M_ %Z N_ %] O %^ P %_ Q %` R %a S %b T %d U %f V %h W %i X %j Y %k Z %l [ %m \ %o ] %s & %r 3^ %t __TABLE_END__ %h2z = split(/\s+/, $h2z . $h2z_high); %z2h = reverse %h2z; $_ = ''; for $f ('jis', 'sjis', 'euc') { for $t ('jis', 'sjis', 'euc') { $_ .= "\$convf{'$f', '$t'} = *${f}2${t};\n"; } $_ .= "\$h2zf{'$f'} = *h2z_${f};\n\$z2hf{'$f'} = *z2h_${f};\n"; } eval $_; } ;# ;# Set escape sequences which should be put before and after Japanese ;# (JIS X0208) string. ;# sub jis_inout { $esc_jp = shift || $esc_jp; $esc_jp = "\e\$$esc_jp" if length($esc_jp) == 1; $esc_asc = shift || $esc_asc; $esc_asc = "\e\($esc_asc" if length($esc_asc) == 1; ($esc_jp, $esc_asc); } ;# ;# Get JIS in and out sequences from the string. ;# sub get_inout { local($esc_jp, $esc_asc); $_[$[] =~ /$re_jp/o && ($esc_jp = $&); $_[$[] =~ /$re_asc/o && ($esc_asc = $&); ($esc_jp, $esc_asc); } ;# ;# Recognize character code. ;# sub getcode { local(*_) = @_; return undef unless /[\e\200-\377]/; return 'jis' if /$re_jp|$re_asc|$re_kana/o; return 'binary' if /$re_bin/o; local($sjis, $euc); $sjis += length($&) while /($re_sjis_c)+/go; $euc += length($&) while /($re_euc_c)+/go; (&max($sjis, $euc), ('euc', undef, 'sjis')[($sjis<=>$euc) + $[ + 1]); } sub max { $_[ $[ + ($_[$[] < $_[$[+1]) ]; } ;# ;# Convert any code to specified code. ;# sub convert { local(*_, $ocode, $icode, $opt) = @_; return (undef, undef) unless $icode = $icode || &getcode(*_); return (undef, $icode) if $icode eq 'binary'; $ocode = 'jis' unless $ocode; $ocode = $icode if $ocode eq 'noconv'; local(*convf) = $convf{$icode, $ocode}; do convf(*_, $opt); (*convf, $icode); } ;# ;# Easy return-by-value interfaces. ;# sub jis { &to('jis', @_); } sub euc { &to('euc', @_); } sub sjis { &to('sjis', @_); } sub to { local($ocode, $_, $icode, $opt) = @_; &convert(*_, $ocode, $icode, $opt); $_; } sub what { local($_) = @_; &getcode(*_); } sub trans { local($_) = shift; &tr(*_, @_); $_; } ;# ;# SJIS to JIS ;# sub sjis2jis { local(*_, $opt, $n) = @_; &sjis2sjis(*_, $opt) if $opt; s/($re_sjis_kana)+|($re_sjis_c)+/&_sjis2jis($&, $')/geo; $n; } sub _sjis2jis { local($_) = shift; local($post) = $_[$[] =~ /^($re_sjis_kana|$re_sjis_c)/o ? "" : $esc_asc; if (/^$re_sjis_kana/o) { $n += tr/\241-\337/\041-\137/; $esc_kana . $_ . $post; } else { $n += s/$re_sjis_c/$s2e{$&}||&s2e($&)/geo; tr/\241-\376/\041-\176/; $esc_jp . $_ . $post; } } ;# ;# EUC to JIS ;# sub euc2jis { local(*_, $opt, $n) = @_; &euc2euc(*_, $opt) if $opt; s/($re_euc_kana)+|($re_euc_c)+/&_euc2jis($&, $')/geo; $n; } sub _euc2jis { local($_) = shift; local($pre) = tr/\216//d ? $esc_kana : $esc_jp; local($post) = $_[$[] =~ /^($re_euc_kana|$re_euc_c)/o ? "" : $esc_asc; $n += tr/\241-\376/\041-\176/; $pre . $_ . $post; } ;# ;# JIS to EUC ;# sub jis2euc { local(*_, $opt, $n) = @_; s/($re_jp|$re_asc|$re_kana)([^\e]*)/&_jis2euc($1,$2)/geo; &euc2euc(*_, $opt) if $opt; $n; } sub _jis2euc { local($esc, $_) = @_; if ($esc !~ /$re_asc/o) { $n += tr/\041-\176/\241-\376/; s/[\241-\337]/\216$&/g if $esc =~ /$re_kana/o; } $_; } ;# ;# JIS to SJIS ;# sub jis2sjis { local(*_, $opt, $n) = @_; &jis2jis(*_, $opt) if $opt; s/($re_jp|$re_asc|$re_kana)([^\e]*)/&_jis2sjis($1,$2)/geo; $n; } sub _jis2sjis { local($esc, $_) = @_; if ($esc !~ /$re_asc/o) { $n += tr/\041-\176/\241-\376/; s/$re_euc_c/$e2s{$&}||&e2s($&)/geo if $esc =~ /$re_jp/o; } $_; } ;# ;# SJIS to EUC ;# sub sjis2euc { local(*_, $opt,$n) = @_; $n = s/$re_sjis_kana|$re_sjis_c/$s2e{$&}||&s2e($&)/geo; &euc2euc(*_, $opt) if $opt; $n; } sub s2e { local($c1, $c2, $code); ($c1, $c2) = unpack('CC', $code = shift); if (0xa1 <= $c1 && $c1 <= 0xdf) { $c2 = $c1; $c1 = 0x8e; } elsif (0x9f <= $c2) { $c1 = $c1 * 2 - ($c1 >= 0xe0 ? 0xe0 : 0x60); $c2 += 2; } else { $c1 = $c1 * 2 - ($c1 >= 0xe0 ? 0xe1 : 0x61); $c2 += 0x60 + ($c2 < 0x7f); } if ($cache) { $s2e{$code} = pack('CC', $c1, $c2); } else { pack('CC', $c1, $c2); } } ;# ;# EUC to SJIS ;# sub euc2sjis { local(*_, $opt,$n) = @_; &euc2euc(*_, $opt) if $opt; $n = s/$re_euc_c|$re_euc_kana/$e2s{$&}||&e2s($&)/geo; } sub e2s { local($c1, $c2, $code); ($c1, $c2) = unpack('CC', $code = shift); if ($c1 == 0x8e) { return substr($code, 1, 1); } elsif ($c1 % 2) { $c1 = ($c1>>1) + ($c1 < 0xdf ? 0x31 : 0x71); $c2 -= 0x60 + ($c2 < 0xe0); } else { $c1 = ($c1>>1) + ($c1 < 0xdf ? 0x30 : 0x70); $c2 -= 2; } if ($cache) { $e2s{$code} = pack('CC', $c1, $c2); } else { pack('CC', $c1, $c2); } } ;# ;# JIS to JIS, SJIS to SJIS, EUC to EUC ;# sub jis2jis { local(*_, $opt) = @_; s/$re_jp/$esc_jp/go; s/$re_asc/$esc_asc/go; &h2z_jis(*_) if $opt =~ /z/; &z2h_jis(*_) if $opt =~ /h/; } sub sjis2sjis { local(*_, $opt) = @_; &h2z_sjis(*_) if $opt =~ /z/; &z2h_sjis(*_) if $opt =~ /h/; } sub euc2euc { local(*_, $opt) = @_; &h2z_euc(*_) if $opt =~ /z/; &z2h_euc(*_) if $opt =~ /h/; } ;# ;# Cache control functions ;# sub cache { ($cache, $cache = 1)[$[]; } sub nocache { ($cache, $cache = 0)[$[]; } sub flushcache { undef %e2s; undef %s2e; } ;# ;# X0201 -> X0208 KANA conversion routine ;# sub h2z_jis { local(*_, $n) = @_; if (s/$re_kana([^\e]*)/$esc_jp . &_h2z_jis($1)/geo) { 1 while s/($re_jp[^\e]*)$re_jp/$1/o; } $n; } sub _h2z_jis { local($_) = @_; $n += s/[\41-\137]([\136\137])?/$h2z{$&}/g; $_; } sub h2z_euc { local(*_) = @_; s/\216([\241-\337])(\216([\336\337]))?/$h2z{"$1$3"}/g; } sub h2z_sjis { local(*_, $n) = @_; s/(($re_sjis_c)+)|(([\241-\337])([\336\337])?)/ $1 || ($n++, $e2s{$h2z{$3}} || &e2s($h2z{$3}))/geo; $n; } ;# ;# X0208 -> X0201 KANA conversion routine ;# sub z2h_jis { local(*_, $n) = @_; s/$re_jp([^\e]+)/&_z2h_jis($1)/geo; $n; } sub _z2h_jis { local($_) = @_; s/(\%[!-~]|![\#\"&VW+,<])+|([^!%][!-~]|![^\#\"&VW+,<])+/&__z2h_jis($&)/ge; $_; } sub __z2h_jis { local($_) = @_; return $esc_jp . $_ unless /^%/ || /^![\#\"&VW+,<]/; $n += length($_) / 2; s/../$z2h{$&}/g; $esc_kana . $_; } sub z2h_euc { local(*_, $n) = @_; &init_z2h_euc unless defined %z2h_euc; s/$re_euc_c|$re_euc_kana/$z2h_euc{$&} ? ($n++, $z2h_euc{$&}) : $&/geo; $n; } sub z2h_sjis { local(*_, $n) = @_; &init_z2h_sjis unless defined %z2h_sjis; s/$re_sjis_c/$z2h_sjis{$&} ? ($n++, $z2h_sjis{$&}) : $&/geo; $n; } ;# ;# Initializing JIS X0208 to X0201 KANA table for EUC and SJIS. This ;# can be done in &init but it's not worth doing. Similarly, ;# precalculated table is not worth to occupy the file space and ;# reduce the readability. The author personnaly discourages to use ;# X0201 Kana character in the any situation. ;# sub init_z2h_euc { local($k, $_); s/[\241-\337]/\216$&/g && ($z2h_euc{$k} = $_) while ($k, $_) = each %z2h; } sub init_z2h_sjis { local($_, $v); /[\200-\377]/ && ($z2h_sjis{&e2s($_)} = $v) while ($_, $v) = each %z2h; } ;# ;# TR function for 2-byte code ;# sub tr { # $prev_from, $prev_to, %table are persistent variables local(*_, $from, $to, $opt) = @_; local(@from, @to); local($jis, $n) = (0, 0); $jis = /$re_jp/o || $to =~ /$re_jp/o; &jis2euc(*_) if /$re_jp/o; if ($from ne $prev_from || $to ne $prev_to) { ($prev_from, $prev_to) = ($from, $to); undef %table; &_maketable; } s/[\200-\377][\000-\377]|[\000-\377]/ defined($table{$&}) && ++$n ? $table{$&} : $&/ge; &euc2jis(*_) if $jis; $n; } sub _maketable { local($ascii) = '(\\\\[\\-\\\\]|[\0-\133\135-\177])'; &jis2euc(*to) if $to =~ /$re_jp/o; &jis2euc(*from) if $from =~ /$re_jp/o; grep(s/([\200-\377])[\200-\377]-\1[\200-\377]/&_expnd2($&)/ge, $from, $to); grep(s/$ascii-$ascii/&_expnd1($&)/geo, $from, $to); @to = $to =~ /[\200-\377][\000-\377]|[\000-\377]/g; @from = $from =~ /[\200-\377][\000-\377]|[\000-\377]/g; push(@to, ($opt =~ /d/ ? '' : $to[$#to]) x (@from - @to)) if @to < @from; @table{@from} = @to; } sub _expnd1 { local($_) = @_; s/\\(.)/$1/g; local($c1, $c2) = unpack('CxC', $_); if ($c1 <= $c2) { for ($_ = ''; $c1 <= $c2; $c1++) { $_ .= pack('C', $c1); } } $_; } sub _expnd2 { local($_) = @_; local($c1, $c2, $c3, $c4) = unpack('CCxCC', $_); if ($c1 == $c3 && $c2 <= $c4) { for ($_ = ''; $c2 <= $c4; $c2++) { $_ .= pack('CC', $c1, $c2); } } $_; } 1;