| 1 | ##---------------------------------------------------------------------------## |
| 2 | ## File: |
| 3 | ## $Id: iso2022jp.pl,v 1.8 2002/07/30 18:20:46 ehood Exp $ |
| 4 | ## Author(s): |
| 5 | ## Earl Hood mhonarc@mhonarc.org |
| 6 | ## NIIBE Yutaka gniibe@mri.co.jp |
| 7 | ## Takashi P.KATOH p-katoh@shiratori.riec.tohoku.ac.jp |
| 8 | ## Description: |
| 9 | ## Library defines routine to process iso-2022-jp data. |
| 10 | ##---------------------------------------------------------------------------## |
| 11 | ## Copyright (C) 1995-2002 |
| 12 | ## Earl Hood, mhonarc@mhonarc.org |
| 13 | ## NIIBE Yutaka, gniibe@mri.co.jp |
| 14 | ## Takashi P.KATOH, p-katoh@shiratori.riec.tohoku.ac.jp |
| 15 | ## |
| 16 | ## This program is free software; you can redistribute it and/or modify |
| 17 | ## it under the terms of the GNU General Public License as published by |
| 18 | ## the Free Software Foundation; either version 2 of the License, or |
| 19 | ## (at your option) any later version. |
| 20 | ## |
| 21 | ## This program is distributed in the hope that it will be useful, |
| 22 | ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 24 | ## GNU General Public License for more details. |
| 25 | ## |
| 26 | ## You should have received a copy of the GNU General Public License |
| 27 | ## along with this program; if not, write to the Free Software |
| 28 | ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
| 29 | ## 02111-1307, USA |
| 30 | ##---------------------------------------------------------------------------## |
| 31 | |
| 32 | package iso_2022_jp; |
| 33 | |
| 34 | $Url = '(http://|https://|ftp://|afs://|wais://|telnet://|ldap://' . |
| 35 | '|gopher://|news:|nntp:|mid:|cid:|mailto:|prospero:)'; |
| 36 | $UrlExp = $Url . q%[^\s\(\)\|<>"']*[^\.?!;,"'\|\[\]\(\)\s<>]%; |
| 37 | $HUrlExp = $Url . q%[^\s\(\)\|<>"'\&]*[^\.?!;,"'\|\[\]\(\)\s<>\&]%; |
| 38 | |
| 39 | ##---------------------------------------------------------------------------## |
| 40 | ## str2html(): Convert an iso-2022-jp string into HTML. Function |
| 41 | ## interface similiar as iso8859.pl function. |
| 42 | ## |
| 43 | sub str2html { jp2022_to_html($_[0], 1); } |
| 44 | |
| 45 | ##---------------------------------------------------------------------------## |
| 46 | ## Function to convert ISO-2022-JP data into HTML. Function is based |
| 47 | ## on the following RFCs: |
| 48 | ## |
| 49 | ## RFC-1468 I |
| 50 | ## J. Murai, M. Crispin, E. van der Poel, "Japanese Character |
| 51 | ## Encoding for Internet Messages", 06/04/1993. (Pages=6) |
| 52 | ## |
| 53 | ## RFC-1554 I |
| 54 | ## M. Ohta, K. Handa, "ISO-2022-JP-2: Multilingual Extension of |
| 55 | ## ISO-2022-JP", 12/23/1993. (Pages=6) |
| 56 | ## |
| 57 | sub jp2022_to_html { |
| 58 | my($body) = shift; |
| 59 | my($nourl) = shift; |
| 60 | my(@lines) = split(/\r?\n/,$body); |
| 61 | my($ret, $ascii_text); |
| 62 | local($_); |
| 63 | |
| 64 | $ret = ""; |
| 65 | foreach (@lines) { |
| 66 | # a trick to process preceding ASCII text |
| 67 | $_ = "\033(B" . $_ unless /^\033/; |
| 68 | |
| 69 | # Process Each Segment |
| 70 | while(1) { |
| 71 | if (s/^(\033\([BJ])//) { # Single Byte Segment |
| 72 | $ret .= $1; |
| 73 | while(1) { |
| 74 | if (s/^([^\033]+)//) { # ASCII plain text |
| 75 | $ascii_text = $1; |
| 76 | |
| 77 | # Replace meta characters in ASCII plain text |
| 78 | $ascii_text =~ s%\&%\&%g; |
| 79 | $ascii_text =~ s%<%\<%g; |
| 80 | $ascii_text =~ s%>%\>%g; |
| 81 | ## Convert URLs to hyperlinks |
| 82 | $ascii_text =~ s%($HUrlExp)%<a href="$1">$1</a>%gio |
| 83 | unless $nourl; |
| 84 | |
| 85 | $ret .= $ascii_text; |
| 86 | } elsif (s/(\033\.[A-F])//) { # G2 Designate Sequence |
| 87 | $ret .= $1; |
| 88 | } elsif (s/(\033N[ -\7f])//) { # Single Shift Sequence |
| 89 | $ret .= $1; |
| 90 | } else { |
| 91 | last; |
| 92 | } |
| 93 | } |
| 94 | } elsif (s/^(\033\$[\@AB]|\033\$\([CD])//) { # Double Byte Segment |
| 95 | $ret .= $1; |
| 96 | while (1) { |
| 97 | if (s/^([!-~][!-~]+)//) { # Double Char plain text |
| 98 | $ret .= $1; |
| 99 | } elsif (s/(\033\.[A-F])//) { # G2 Designate Sequence |
| 100 | $ret .= $1; |
| 101 | } elsif (s/(\033N[ -\7f])//) { # Single Shift Sequence |
| 102 | $ret .= $1; |
| 103 | } else { |
| 104 | last; |
| 105 | } |
| 106 | } |
| 107 | } else { |
| 108 | # Something wrong in text |
| 109 | $ret .= $_; |
| 110 | last; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | # remove a `trick' |
| 115 | $ret =~ s/^\033\(B//; |
| 116 | |
| 117 | $ret .= "\n"; |
| 118 | } |
| 119 | |
| 120 | ($ret); |
| 121 | } |
| 122 | |
| 123 | |
| 124 | ##---------------------------------------------------------------------------## |
| 125 | ## clip($str, $length, $is_html, $has_tags): Clip an iso-2022-jp string. |
| 126 | ## |
| 127 | ## The last argument $is_html specifies '&' should be treated |
| 128 | ## as HTML character or not. |
| 129 | ## (i.e., the length of '&' will be 1 if $is_html). |
| 130 | ## |
| 131 | sub clip { # &clip($str, 10, 1, 1); |
| 132 | my($str) = shift; |
| 133 | my($length) = shift; |
| 134 | my($is_html) = shift; |
| 135 | my($has_tags) = shift; |
| 136 | my($ret, $inascii); |
| 137 | local($_) = $str; |
| 138 | |
| 139 | $ret = ""; |
| 140 | # a trick to process preceding ASCII text |
| 141 | $_ = "\033(B" . $_ unless /^\033/; |
| 142 | |
| 143 | # Process Each Segment |
| 144 | CLIP: while(1) { |
| 145 | if (s/^(\033\([BJ])//) { # Single Byte Segment |
| 146 | $inascii = 1; |
| 147 | $ret .= $1; |
| 148 | while(1) { |
| 149 | if (s/^([^\033])//) { # ASCII plain text |
| 150 | if ($is_html) { |
| 151 | if (($1 eq '<') && $has_tags) { |
| 152 | s/^[^>\033]*>//; |
| 153 | } else { |
| 154 | if ($1 eq '&') { |
| 155 | s/^([^\;]*\;)//; |
| 156 | $ret .= "&$1"; |
| 157 | } else { |
| 158 | $ret .= $1; |
| 159 | } |
| 160 | $length--; |
| 161 | } |
| 162 | } else { |
| 163 | $ret .= $1; |
| 164 | $length--; |
| 165 | } |
| 166 | } elsif (s/(\033\.[A-F])//) { # G2 Designate Sequence |
| 167 | $ret .= $1; |
| 168 | } elsif (s/(\033N[ -\7f])//) { # Single Shift Sequence |
| 169 | $ret .= $1; |
| 170 | $length--; |
| 171 | } else { |
| 172 | last; |
| 173 | } |
| 174 | last CLIP if ($length <= 0); |
| 175 | } |
| 176 | } elsif (s/^(\033\$[\@AB]|\033\$\([CD])//) { # Double Byte Segment |
| 177 | $inascii = 0; |
| 178 | $ret .= $1; |
| 179 | while (1) { |
| 180 | if (s/^([!-~][!-~])//) { # Double Char plain text |
| 181 | $ret .= $1; |
| 182 | # The length of a double-byte-char is assumed 2. |
| 183 | # If we consider compatibility with UTF-8, it should be 1. |
| 184 | $length -= 2; |
| 185 | } elsif (s/(\033\.[A-F])//) { # G2 Designate Sequence |
| 186 | $ret .= $1; |
| 187 | } elsif (s/(\033N[ -\7f])//) { # Single Shift Sequence |
| 188 | $ret .= $1; |
| 189 | $length--; |
| 190 | } else { |
| 191 | last; |
| 192 | } |
| 193 | last CLIP if ($length <= 0); |
| 194 | } |
| 195 | } else { |
| 196 | # Something wrong in text |
| 197 | $ret .= $_; |
| 198 | last; |
| 199 | } |
| 200 | } |
| 201 | |
| 202 | # remove a `trick' |
| 203 | $ret =~ s/^\033\(B//; |
| 204 | |
| 205 | # Shuold we check the last \033\([BJ] sequence? |
| 206 | # (I believe it is too paranoid). |
| 207 | $ret .= "\033(B" unless $inascii; |
| 208 | |
| 209 | ($ret); |
| 210 | } |
| 211 | ##---------------------------------------------------------------------------## |
| 212 | 1; |