1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.49 2005/02/24 08:32:11 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:
40: package Apache::lontexconvert;
41:
42: use strict;
43: use tth();
44: use vars qw($errorstring);
45: use Apache();
46: use Apache::lonmsg();
47: use Apache::lonxml();
48: use Apache::lonmenu();
49: use Apache::lonlocal;
50:
51: # ====================================================================== Header
52:
53: sub init_tth {
54: my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
55: if ($ENV{'browser.mathml'}) {
56: &tth::ttminit();
57: if ($ENV{'browser.unicode'}) {
58: &tth::ttmoptions('-L -u1 '.$options);
59: } else {
60: &tth::ttmoptions('-L -u0 '.$options);
61: }
62: } else {
63: &tth::tthinit();
64: if ($ENV{'browser.unicode'}) {
65: &tth::tthoptions('-L -u1 '.$options);
66: } else {
67: &tth::tthoptions('-L -u0 '.$options);
68: }
69: }
70: }
71:
72: sub header {
73: $errorstring='';
74: my $time=time;
75: &init_tth();
76: return &Apache::lonxml::xmlbegin().
77: "\n<head>\n".
78: &Apache::lonxml::fontsettings().
79: &Apache::lonmenu::registerurl(undef,'tex').
80: "\n</head>\n";
81: }
82:
83: # ================================================================== Conversion
84:
85: $Apache::lontexconvert::messedup=0;
86:
87: # we need this routine because &converted can get called from inside
88: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
89: # allow the opcode for alarm, so we need to compile this before we get
90: # into the safe space since opcode checks only occur at compile time
91: sub convert_real {
92: my ($texstring)=@_;
93: my ($xmlstring,$errorstring);
94: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
95: local $SIG{ALRM}=sub {
96: &Apache::lonnet::logthis("ALRM");
97: $xmlstring='['.&mt("TeX unconverted due to errors").']';
98: $Apache::lontexconvert::messedup=1;
99: die &mt("TeX unconverted due to errors");
100: };
101: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
102: if ($ENV{'browser.mathml'}) {
103: $xmlstring=&tth::ttm($$texstring);
104: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
105: $xmlstring=~s/\<br\>/\<br\/\>/g;
106: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
107: $errorstring.=&tth::ttmerror();
108: } else {
109: $xmlstring=&tth::tth($$texstring);
110: $errorstring.=&tth::ttherror();
111: $xmlstring=~s-</font(\s*)>-</font>-g;
112: }
113: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
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: $errorstring) {
135: &Apache::lonnet::logthis("Trying to kill myself");
136: $Apache::lontexconvert::messedup=1;
137: my $request=Apache->request();
138: $request->child_terminate();
139: }
140: return $xmlstring;
141: }
142:
143: # ====================================================================== Footer
144:
145: sub footer {
146: my $xmlstring='';
147: if ($ENV{'request.state'} eq 'construct') {
148: $xmlstring.='<address>'.$errorstring.'</address>';
149: } else {
150: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);
151: }
152: # -------------------------------------------------------------------- End Body
153: $xmlstring.=&Apache::lonxml::xmlend();
154: return $xmlstring;
155: }
156:
157: # ------------------------------------------------------------ Message display
158:
159: sub to_convert {
160: my ($string) = @_;
161: $string=~s/\<br\s*\/?\>/ /gs;
162: # $string=~s/\s/ /gs;
163: $string=&HTML::Entities::decode($string);
164: return &converted(\$string);
165: }
166:
167: sub smiley {
168: my $expression=shift;
169: if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
170: my %smileys=('\:\-\)' => 'smiley',
171: '8\-\)' => 'coolsmile',
172: '8\-(I|\|)' => 'coolindiff',
173: ':\-(I|\|)' => 'neutral',
174: '\:\-(o|O|\(\))' => 'shocked',
175: ':\-\(' => 'frowny',
176: '\;\-\)' => 'wink',
177: '\:\-P' => 'baeh',
178: '\:\-(\\\|\\/)' => 'hrrm',
179: '\:\-D' => 'bigsmile',
180: '\:\-C' => 'angry',
181: '\:(\'|\`)\-\(' => 'cry',
182: '\:\-(X|\#)' => 'lipsrsealed',
183: '\:\-S' => 'huh');
184: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
185: foreach (keys %smileys) {
186: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
187: }
188: return $expression;
189: }
190:
191: sub msgtexconverted {
192: my ($message,$email) = @_;
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: sub algebra {
216: use AlgParser;
217:
218: my ($string,$target)=@_;
219: my $parser = new AlgParserWithImplicitExpand;
220: $string=&prepare_algebra($string);
221: my $ret = $parser->parse($string);
222: my $result='['.&mt('Algebra unconverted due to previous errors').']';
223: if ( ref($ret) ) {
224: $parser->tostring();
225: $parser->normalize();
226: my $latex=$parser->tolatex();
227: $latex=&postprocess_algebra($latex);
228: $latex='$'.$latex.'$';
229: if ($target eq 'web' || $target eq 'analyze') {
230: $result = &converted(\$latex);
231: } else {
232: $result = $latex;
233: }
234: } else {
235: &Apache::lonxml::error($parser->{'htmlerror'});
236: }
237: }
238:
239: sub prepare_algebra {
240: my ($string)=@_;
241:
242: # change some multi character operators into single character operators
243: $string =~ s/<>/\#/g;
244: $string =~ s/<\=/\%/g;
245: $string =~ s/>\=/\!/g;
246:
247: # makes the decision about what is a minus sign easier
248: $string =~ s/([\=\>\<\%\!\#] *)-/$1 zeroplace -/g;
249:
250: return $string;
251: }
252:
253: sub postprocess_algebra {
254: my ($string)=@_;
255:
256: # exapnd out some operators
257: $string =~ s/\#/\\not= /g;
258: $string =~ s/\%/\\leq /g;
259: $string =~ s/\!/\\geq /g;
260:
261: return $string;
262: }
263: 1;
264: __END__
265:
266:
267:
268:
269:
270:
271:
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