1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.36 2004/03/19 17:54:17 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # Copyright for TtHfunc and TtMfunc by Ian Hutchinson.
29: # TtHfunc and TtMfunc (the "Code") may be compiled and linked into
30: # binary executable programs or libraries distributed by the
31: # Michigan State University (the "Licensee"), but any binaries so
32: # distributed are hereby licensed only for use in the context
33: # of a program or computational system for which the Licensee is the
34: # primary author or distributor, and which performs substantial
35: # additional tasks beyond the translation of (La)TeX into HTML.
36: # The C source of the Code may not be distributed by the Licensee
37: # to any other parties under any circumstances.
38: #
39: # 05/29/00,05/30,10/11,10/20 Gerd Kortemeyer
40: # 5/4 Gerd Kortemeyer
41:
42: package Apache::lontexconvert;
43:
44: use strict;
45: use tth();
46: use vars qw($errorstring);
47: use Apache();
48: use Apache::lonmsg();
49: use Apache::lonxml();
50: use Apache::lonmenu();
51: use Apache::lonlocal;
52:
53: # ====================================================================== Header
54:
55: sub init_tth {
56: my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
57: if ($ENV{'browser.mathml'}) {
58: &tth::ttminit();
59: if ($ENV{'browser.unicode'}) {
60: &tth::ttmoptions('-L -u1 '.$options);
61: } else {
62: &tth::ttmoptions('-L -u0 '.$options);
63: }
64: } else {
65: &tth::tthinit();
66: if ($ENV{'browser.unicode'}) {
67: &tth::tthoptions('-L -u1 '.$options);
68: } else {
69: &tth::tthoptions('-L -u0 '.$options);
70: }
71: }
72: }
73:
74: sub header {
75: $errorstring='';
76: my $time=time;
77: &init_tth();
78: return &Apache::lonxml::xmlbegin().
79: &Apache::lonxml::fontsettings().
80: "\n<head>\n".
81: &Apache::lonmenu::registerurl(undef,'tex').
82: "\n</head>\n";
83: }
84:
85: # ================================================================== Conversion
86:
87: $Apache::lontexconvert::messedup=0;
88:
89: # we need this routine because &converted can get called from inside
90: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
91: # allow the opcode for alarm, so we need to compile this before we get
92: # into the safe space since opcode checks only occur at compile time
93: sub convert_real {
94: my ($texstring)=@_;
95: my ($xmlstring,$errorstring);
96: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
97: local $SIG{ALRM}=sub {
98: $xmlstring='['.&mt("TeX unconverted due to errors").']';
99: $Apache::lontexconvert::messedup=1;
100: die &mt("TeX unconverted due to errors");
101: };
102: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
103: if ($ENV{'browser.mathml'}) {
104: $xmlstring=&tth::ttm($$texstring);
105: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
106: $xmlstring=~s/\<br\>/\<br\/\>/g;
107: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
108: $errorstring.=&tth::ttmerror();
109: } else {
110: $xmlstring=&tth::tth($$texstring);
111: $errorstring.=&tth::ttherror();
112: $xmlstring=~s-</font(\s*)>-</font>-g;
113: }
114: $xmlstring=~s/^\s*//;
115: $xmlstring=~s/\s*$//;
116: alarm(0);
117: return ($xmlstring,$errorstring);
118: }
119:
120: sub converted {
121: my $texstring=shift;
122: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
123: if ($Apache::lontexconvert::messedup) {
124: return '['.&mt('TeX unconverted due to previous errors').']';
125: }
126: eval(<<'ENDCONV');
127: ($xmlstring,$errorstring)=&convert_real($texstring)
128: ENDCONV
129: if ($@) {
130: $errorstring.=&mt("Evaluation Error: ").$@;
131: $Apache::lontexconvert::messedup=1;
132: }
133: if ($Apache::lontexconvert::messedup || &tth::tthmessedup()) {
134: &Apache::lonnet::logthis("Trying to kill myself");
135: $Apache::lontexconvert::messedup=1;
136: my $request=Apache->request();
137: $request->child_terminate();
138: }
139: return $xmlstring;
140: }
141:
142: # ====================================================================== Footer
143:
144: sub footer {
145: my $xmlstring='';
146: if ($ENV{'request.state'} eq 'construct') {
147: $xmlstring.='<address>'.$errorstring.'</address>';
148: } else {
149: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);
150: }
151: # -------------------------------------------------------------------- End Body
152: $xmlstring.=&Apache::lonxml::xmlend();
153: return $xmlstring;
154: }
155:
156: # ------------------------------------------------------------ Message display
157:
158: sub to_convert {
159: my ($string) = @_;
160: $string=~s/\<br\s*\/?\>/ /gs;
161: # $string=~s/\s/ /gs;
162: $string=&HTML::Entities::decode($string);
163: return &converted(\$string);
164: }
165:
166: sub smiley {
167: my $expression=shift;
168: if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
169: my %smileys=('\:\-\)' => 'smiley',
170: '8\-\)' => 'coolsmile',
171: '8\-(I|\|)' => 'coolindiff',
172: ':\-(I|\|)' => 'neutral',
173: '\:\-(o|O|\(\))' => 'shocked',
174: ':\-\(' => 'frowny',
175: '\;\-\)' => 'wink',
176: '\:\-P' => 'baeh',
177: '\:\-(\\\|\\/)' => 'hrrm',
178: '\:\-D' => 'bigsmile',
179: '\:\-C' => 'angry',
180: '\:(\'|\`)\-\(' => 'cry',
181: '\:\-(X|\#)' => 'lipsrsealed',
182: '\:\-S' => 'huh');
183: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
184: foreach (keys %smileys) {
185: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
186: }
187: return $expression;
188: }
189:
190: sub msgtexconverted {
191: my $message=shift;
192: my $email=shift;
193: $errorstring='';
194: &init_tth();
195: my $outmessage='';
196: my $tex=0;
197: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
198: if ($tex) {
199: if ($email) {
200: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
201: } else {
202: $outmessage.=&to_convert($_); $tex=0;
203: }
204: } else {
205: $outmessage.=&smiley($_); $tex=1;
206: }
207: }
208: if (wantarray) {
209: return ($outmessage,$errorstring);
210: } else {
211: return $outmessage.$errorstring;
212: }
213: }
214:
215: 1;
216: __END__
217:
218:
219:
220:
221:
222:
223:
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