1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.86 2008/01/29 11:18:06 foxr 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::lonxml();
46: use Apache::lonlocal;
47: use Apache::lonnet;
48: use lib '/home/httpd/lib/perl/';
49: use LONCAPA;
50:
51:
52: # ====================================================================== Header
53:
54: sub init_tth {
55: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
56: if ($options =~ /\S/) {
57: $options = ' '.$options;
58: } else {
59: undef($options);
60: }
61: if ($env{'browser.mathml'}) {
62: &tth::ttminit();
63: if ($env{'browser.unicode'}) {
64: &tth::ttmoptions('-L -u1'.$options);
65: } else {
66: &tth::ttmoptions('-L -u0'.$options);
67: }
68: } else {
69: &tth::tthinit();
70: if ($env{'browser.unicode'}) {
71: &tth::tthoptions('-L -u1'.$options);
72: } else {
73: &tth::tthoptions('-L -u0'.$options);
74: }
75: }
76: }
77:
78: # ================================================================== Conversion
79:
80: $Apache::lontexconvert::messedup=0;
81:
82: # we need this routine because &converted can get called from inside
83: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
84: # allow the opcode for alarm, so we need to compile this before we get
85: # into the safe space since opcode checks only occur at compile time
86: sub convert_real {
87: my ($texstring)=@_;
88: my ($xmlstring,$errorstring);
89: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
90: local $SIG{ALRM}=sub {
91: &Apache::lonnet::logthis("ALRM");
92: $xmlstring='['.&mt("TeX unconverted due to errors").']';
93: $Apache::lontexconvert::messedup=1;
94: die &mt("TeX unconverted due to errors");
95: };
96: &Apache::lonxml::start_alarm();
97: if ($env{'browser.mathml'}) {
98: $xmlstring=&tth::ttm($$texstring);
99: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
100: $xmlstring=~s/\<br\>/\<br\/\>/g;
101: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
102: $errorstring.=&tth::ttmerror();
103: } else {
104: $xmlstring=&tth::tth($$texstring);
105: $errorstring.=&tth::ttherror();
106: $xmlstring=~s-</font(\s*)>-</font>-g;
107: }
108: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
109: $xmlstring=~s/^\s*//;
110: $xmlstring=~s/\s*$//;
111: #
112: # \rightleftharpoons is not converted by tth but maps
113: # reasonably well to ⇔. If we get many more of these,
114: # we're going to need to have a translation sub.
115: #
116: $xmlstring=~s/\\rightleftharpoons/\&\#8660;/g;
117:
118: &Apache::lonxml::end_alarm();
119: return ($xmlstring,$errorstring);
120: }
121:
122: sub tth_converted {
123: my $texstring=shift;
124: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
125: if ($Apache::lontexconvert::messedup) {
126: return '['.&mt('TeX unconverted due to previous errors').']';
127: }
128: $$texstring ='\\documentstyle{article}'.$$texstring;
129:
130: eval(<<'ENDCONV');
131: ($xmlstring,$errorstring)=&convert_real($texstring)
132: ENDCONV
133: if ($@) {
134: $errorstring.=&mt("Evaluation Error: ").$@;
135: $Apache::lontexconvert::messedup=1;
136: }
137: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
138: $errorstring) {
139: &Apache::lonnet::logthis("Trying to kill myself");
140: $Apache::lontexconvert::messedup=1;
141: if (ref($Apache::lonxml::request)) {
142: $Apache::lonxml::request->child_terminate();
143: } else {
144: my $request;
145: eval { $request=Apache->request; };
146: if (!$request) {
147: eval { $request=Apache2::RequestUtil->request; };
148: }
149: if ($request) {
150: $request->child_terminate();
151: } else {
152: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
153: }
154: }
155: }
156: return $xmlstring;
157: }
158:
159: sub clean_out_math_mode {
160: my ($texstring)=@_;
161: $$texstring=~s/(?<!\\)\$//g;
162: $$texstring=~s/\\[\)\(\]\[]//g;
163: $$texstring=~s/\\ensuremath//g;
164: return '';
165: }
166:
167: sub displaystyle {
168: my ($texstring)=@_;
169: #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
170: if ($$texstring=~/[^\\]\$\$/ ||
171: $$texstring=~/\\\[/ ||
172: $$texstring=~/\\displaystyle/) { return 1; }
173: return 0;
174: }
175:
176: sub jsMath_converted {
177: my $texstring=shift;
178: my $tag='span';
179: if (&displaystyle($texstring)) { $tag='div'; }
180: &clean_out_math_mode($texstring);
181: return &jsMath_header().
182: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
183: }
184:
185: {
186: my @jsMath_sent_header;
187: sub jsMath_reset {
188: undef(@jsMath_sent_header);
189: }
190: sub jsMath_push {
191: push(@jsMath_sent_header,0);
192: }
193: sub jsMath_header {
194: if (!@jsMath_sent_header) {
195: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
196: return '';
197: }
198: return '' if $jsMath_sent_header[-1];
199: $jsMath_sent_header[-1]=1;
200: return
201: '<script type="text/javascript">
202: function NoFontMessage () {}
203: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
204: </script>'."\n".
205: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
206: }
207: sub jsMath_process {
208: my $state = pop(@jsMath_sent_header);
209: return '' if !$state;
210: return "\n".
211: '<script type="text/javascript">jsMath.Process()</script>'."\n";
212: }
213: sub jsMath_state {
214: my ($level) = @_;
215: return $jsMath_sent_header[$level];
216: }
217: }
218:
219: sub tex_engine {
220: if (exists($env{'form.texengine'})) {
221: return $env{'form.texengine'};
222: }
223: if ($env{'request.course.id'}
224: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
225: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
226: }
227: if (exists($env{'environment.texengine'})) {
228: return $env{'environment.texengine'};
229: }
230: return 'tth';
231: }
232:
233: sub init_math_support {
234: my ($inherit_jsmath) = @_;
235: &init_tth();
236: &Apache::lontexconvert::jsMath_push();
237: if (lc(&tex_engine()) eq 'jsmath' ||
238: ($inherit_jsmath && &jsMath_state(-2))) {
239: return &Apache::lontexconvert::jsMath_header();
240: }
241: return;
242: }
243:
244: sub mimetex_converted {
245: my $texstring=shift;
246: my $displaystyle=&displaystyle($texstring);
247:
248: &clean_out_math_mode($texstring);
249:
250: if ($displaystyle) {
251: $$texstring='\\displaystyle \\Large '.$$texstring;
252: }
253: my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" />';
254: if ($displaystyle) {
255: $result='<center>'.$result.'</center>';
256: }
257: return $result;
258: }
259:
260: sub converted {
261: my ($string,$mode)=@_;
262: if ($mode eq '') { $mode = &tex_engine(); }
263: if ($mode =~ /tth/i) {
264: return &tth_converted($string);
265: } elsif ($mode =~ /jsmath/i) {
266: return &jsMath_converted($string);
267: } elsif ($mode =~ /mimetex/i) {
268: return &mimetex_converted($string);
269: }
270: return &tth_converted($string);
271: }
272:
273: # ------------------------------------------------------------ Message display
274:
275: sub to_convert {
276: my ($string) = @_;
277: $string=~s/\<br\s*\/?\>/ /gs;
278: # $string=~s/\s/ /gs;
279: $string=&HTML::Entities::decode($string);
280: return &converted(\$string);
281: }
282:
283: sub smiley {
284: my $expression=shift;
285: if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
286: my %smileys=('\:\-\)' => 'smiley',
287: '8\-\)' => 'coolsmile',
288: '8\-(I|\|)' => 'coolindiff',
289: ':\-(I|\|)' => 'neutral',
290: '\:\-(o|O|\(\))' => 'shocked',
291: ':\-\(' => 'frowny',
292: '\;\-\)' => 'wink',
293: '\:\-P' => 'baeh',
294: '\:\-(\\\|\\/)' => 'hrrm',
295: '\:\-D' => 'bigsmile',
296: '\:\-C' => 'angry',
297: '\:(\'|\`)\-\(' => 'cry',
298: '\:\-(X|\#)' => 'lipsrsealed',
299: '\:\-S' => 'huh');
300: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
301: foreach my $smiley (keys(%smileys)) {
302: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}.gif" \/\>/gs;
303: }
304: return $expression;
305: }
306:
307: sub msgtexconverted {
308: my ($message,$email) = @_;
309: $errorstring='';
310: &init_tth();
311: my $outmessage='';
312: my $tex=0;
313: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
314: if ($tex) {
315: if ($email) {
316: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
317: $tex=0;
318: } else {
319: $outmessage.=&to_convert($fragment);
320: $tex=0;
321: }
322: } else {
323: $outmessage.=&smiley($fragment);
324: $tex=1;
325: }
326: }
327: $message=$outmessage; $outmessage=''; $tex=0;
328: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
329: $message)) {
330: if ($tex) {
331: if ($email) {
332: $outmessage.='</pre><tt>'.&algebra($fragment,'web').'</tt><pre>';
333: $tex=0;
334: } else {
335: $outmessage.=&algebra($fragment,'web');
336: $tex=0;
337: }
338: } else {
339: $outmessage.=$fragment;
340: $tex=1;
341: }
342: }
343: if (wantarray) {
344: return ($outmessage,$errorstring);
345: } else {
346: return $outmessage.$errorstring;
347: }
348: }
349:
350: sub algebra {
351: use AlgParser;
352:
353: my ($string,$target,$style)=@_;
354: my $parser = new AlgParserWithImplicitExpand;
355: $string=&prepare_algebra($string);
356: my $ret = $parser->parse($string);
357: my $result='['.&mt('Algebra unconverted due to previous errors').']';
358: if ( ref($ret) ) {
359: #$parser->tostring();
360: $parser->normalize();
361: my $latex=$parser->tolatex();
362: $latex=&postprocess_algebra($latex);
363: if ($style eq 'display') {
364: $latex='$$'.$latex.'$$x';
365: } else {
366: # style is 'inline'
367: $latex='\\ensuremath{'.$latex.'}';
368: }
369: if ($target eq 'web' || $target eq 'analyze') {
370: $result = &converted(\$latex);
371: } else {
372: $result = $latex;
373: }
374: } else {
375: &Apache::lonxml::error($parser->{'htmlerror'});
376: }
377: }
378:
379: sub prepare_algebra {
380: my ($string)=@_;
381:
382: # makes the decision about what is a minus sign easier supposedly
383: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
384:
385: return $string;
386: }
387:
388: sub postprocess_algebra {
389: my ($string)=@_;
390:
391: # moodle had these and I don't know why, ignoring them for now
392: # $string =~s/\\fun/ /g;
393:
394: # sqrt(3,4) means the 4 root of 3
395: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
396:
397: # log(3,4) means the log base 4 of 3
398: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
399:
400: # log(3,4) means the log base 4 of 3
401: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
402:
403: # int(3,a,b) integral from a to b of 3
404: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
405:
406: # int( ... dx) -> ...
407: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
408:
409: #
410: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
411: return $string;
412: }
413: 1;
414: __END__
415:
416:
417:
418:
419:
420:
421:
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