projects / OpenSPARC-T2-DV / blame
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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; |