1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.64 2005/03/01 03:21:05 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: $Apache::lontexconvert::messedup=1;
99: die &mt("TeX unconverted due to errors");
100: };
101: &Apache::lonxml::start_alarm();
102: if ($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: &Apache::lonxml::end_alarm();
117: return ($xmlstring,$errorstring);
118: }
119:
120: sub tth_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: $$texstring ='\\documentstyle{article}'.$$texstring;
127:
128: eval(<<'ENDCONV');
129: ($xmlstring,$errorstring)=&convert_real($texstring)
130: ENDCONV
131: if ($@) {
132: $errorstring.=&mt("Evaluation Error: ").$@;
133: $Apache::lontexconvert::messedup=1;
134: }
135: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
136: $errorstring) {
137: &Apache::lonnet::logthis("Trying to kill myself");
138: $Apache::lontexconvert::messedup=1;
139: my $request=Apache->request();
140: $request->child_terminate();
141: }
142: return $xmlstring;
143: }
144:
145: sub clean_out_math_mode {
146: my ($texstring)=@_;
147: $$texstring=~s/(?!\\)\$//g;
148: $$texstring=~s/\\[\)\(\]\[]//g;
149: $$texstring=~s/\\ensuremath//g;
150: return '';
151: }
152:
153: sub displaystyle {
154: my ($texstring)=@_;
155: #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
156: if ($$texstring=~/[^\\]\$\$/ ||
157: $$texstring=~/\\\[/ ||
158: $$texstring=~/\\displaystyle/) { return 1; }
159: return 0;
160: }
161:
162: sub jsMath_converted {
163: my $texstring=shift;
164: my $tag='span';
165: if (&displaystyle($texstring)) { $tag='div'; }
166: &clean_out_math_mode($texstring);
167: return '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
168: }
169:
170: sub mimetex_converted {
171: my $texstring=shift;
172: my $displaystyle=&displaystyle($texstring);
173:
174: &clean_out_math_mode($texstring);
175:
176: if ($displaystyle) {
177: $$texstring='\\displaystyle \\Large '.$$texstring;
178: }
179: my $result='<img src="/cgi-bin/mimetex.cgi?'.&Apache::lonnet::escape($$texstring).'" />';
180: if ($displaystyle) {
181: $result='<center>'.$result.'</center>';
182: }
183: return $result;
184: }
185:
186: sub converted {
187: if ($ENV{'environment.texengine'} eq 'tth') {
188: return &tth_converted;
189: } elsif ($ENV{'environment.texengine'} eq 'jsMath') {
190: return &jsMath_converted;
191: } elsif ($ENV{'environment.texengine'} eq 'mimetex') {
192: return &mimetex_converted;
193: }
194: return &tth_converted;
195: }
196:
197: # ====================================================================== Footer
198:
199: sub footer {
200: my $xmlstring='';
201: if ($ENV{'request.state'} eq 'construct') {
202: $xmlstring.='<address>'.$errorstring.'</address>';
203: } else {
204: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);
205: }
206: # -------------------------------------------------------------------- End Body
207: $xmlstring.=&Apache::lonxml::xmlend();
208: return $xmlstring;
209: }
210:
211: # ------------------------------------------------------------ Message display
212:
213: sub to_convert {
214: my ($string) = @_;
215: $string=~s/\<br\s*\/?\>/ /gs;
216: # $string=~s/\s/ /gs;
217: $string=&HTML::Entities::decode($string);
218: return &converted(\$string);
219: }
220:
221: sub smiley {
222: my $expression=shift;
223: if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
224: my %smileys=('\:\-\)' => 'smiley',
225: '8\-\)' => 'coolsmile',
226: '8\-(I|\|)' => 'coolindiff',
227: ':\-(I|\|)' => 'neutral',
228: '\:\-(o|O|\(\))' => 'shocked',
229: ':\-\(' => 'frowny',
230: '\;\-\)' => 'wink',
231: '\:\-P' => 'baeh',
232: '\:\-(\\\|\\/)' => 'hrrm',
233: '\:\-D' => 'bigsmile',
234: '\:\-C' => 'angry',
235: '\:(\'|\`)\-\(' => 'cry',
236: '\:\-(X|\#)' => 'lipsrsealed',
237: '\:\-S' => 'huh');
238: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
239: foreach (keys %smileys) {
240: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
241: }
242: return $expression;
243: }
244:
245: sub msgtexconverted {
246: my ($message,$email) = @_;
247: $errorstring='';
248: &init_tth();
249: my $outmessage='';
250: my $tex=0;
251: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
252: if ($tex) {
253: if ($email) {
254: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
255: } else {
256: $outmessage.=&to_convert($_); $tex=0;
257: }
258: } else {
259: $outmessage.=&smiley($_); $tex=1;
260: }
261: }
262: $message=$outmessage; $outmessage=''; $tex=0;
263: foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) {
264: if ($tex) {
265: if ($email) {
266: $outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0;
267: } else {
268: $outmessage.=&algebra($_,'web'); $tex=0;
269: }
270: } else {
271: $outmessage.=$_; $tex=1;
272: }
273: }
274: if (wantarray) {
275: return ($outmessage,$errorstring);
276: } else {
277: return $outmessage.$errorstring;
278: }
279: }
280:
281: sub algebra {
282: use AlgParser;
283:
284: my ($string,$target,$style)=@_;
285: my $parser = new AlgParserWithImplicitExpand;
286: $string=&prepare_algebra($string);
287: my $ret = $parser->parse($string);
288: my $result='['.&mt('Algebra unconverted due to previous errors').']';
289: if ( ref($ret) ) {
290: #$parser->tostring();
291: $parser->normalize();
292: my $latex=$parser->tolatex();
293: $latex=&postprocess_algebra($latex);
294: if ($style eq 'display') {
295: $latex='$$'.$latex.'$$x';
296: } else {
297: # style is 'inline'
298: $latex='\\ensuremath{'.$latex.'}';
299: }
300: if ($target eq 'web' || $target eq 'analyze') {
301: $result = &converted(\$latex);
302: } else {
303: $result = $latex;
304: }
305: } else {
306: &Apache::lonxml::error($parser->{'htmlerror'});
307: }
308: }
309:
310: sub prepare_algebra {
311: my ($string)=@_;
312:
313: # makes the decision about what is a minus sign easier supposedly
314: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
315:
316: return $string;
317: }
318:
319: sub postprocess_algebra {
320: my ($string)=@_;
321:
322: # moodle had these and I don't know why, ignoring them for now
323: # $string =~s/\\fun/ /g;
324:
325: # sqrt(3,4) -> \sqrt\let{3,4\right}, which is annoying
326: $string =~s/\\left\{/\{/g;
327: $string =~s/\\right\}/\}/g;
328:
329: # remove the extra () in the denominator of a \frac
330: $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
331:
332: # sqrt(3,4) means the 4 root of 3
333: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
334:
335: # log(3,4) means the log base 4 of 3
336: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
337:
338: # log(3,4) means the log base 4 of 3
339: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
340:
341: # int(3,a,b) integral from a to b of 3
342: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
343:
344: # int( ... dx) -> ...
345: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
346:
347: #
348: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
349: return $string;
350: }
351: 1;
352: __END__
353:
354:
355:
356:
357:
358:
359:
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