1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.71 2006/03/27 20:40:42 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: use Apache::lonnet;
51:
52: # ====================================================================== Header
53:
54: sub init_tth {
55: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
56: if ($env{'browser.mathml'}) {
57: &tth::ttminit();
58: if ($env{'browser.unicode'}) {
59: &tth::ttmoptions('-L -u1 '.$options);
60: } else {
61: &tth::ttmoptions('-L -u0 '.$options);
62: }
63: } else {
64: &tth::tthinit();
65: if ($env{'browser.unicode'}) {
66: &tth::tthoptions('-L -u1 '.$options);
67: } else {
68: &tth::tthoptions('-L -u0 '.$options);
69: }
70: }
71: }
72:
73: # ================================================================== Conversion
74:
75: $Apache::lontexconvert::messedup=0;
76:
77: # we need this routine because &converted can get called from inside
78: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
79: # allow the opcode for alarm, so we need to compile this before we get
80: # into the safe space since opcode checks only occur at compile time
81: sub convert_real {
82: my ($texstring)=@_;
83: my ($xmlstring,$errorstring);
84: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
85: local $SIG{ALRM}=sub {
86: &Apache::lonnet::logthis("ALRM");
87: $xmlstring='['.&mt("TeX unconverted due to errors").']';
88: $Apache::lontexconvert::messedup=1;
89: die &mt("TeX unconverted due to errors");
90: };
91: &Apache::lonxml::start_alarm();
92: if ($env{'browser.mathml'}) {
93: $xmlstring=&tth::ttm($$texstring);
94: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
95: $xmlstring=~s/\<br\>/\<br\/\>/g;
96: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
97: $errorstring.=&tth::ttmerror();
98: } else {
99: $xmlstring=&tth::tth($$texstring);
100: $errorstring.=&tth::ttherror();
101: $xmlstring=~s-</font(\s*)>-</font>-g;
102: }
103: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
104: $xmlstring=~s/^\s*//;
105: $xmlstring=~s/\s*$//;
106: &Apache::lonxml::end_alarm();
107: return ($xmlstring,$errorstring);
108: }
109:
110: sub tth_converted {
111: my $texstring=shift;
112: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
113: if ($Apache::lontexconvert::messedup) {
114: return '['.&mt('TeX unconverted due to previous errors').']';
115: }
116: $$texstring ='\\documentstyle{article}'.$$texstring;
117:
118: eval(<<'ENDCONV');
119: ($xmlstring,$errorstring)=&convert_real($texstring)
120: ENDCONV
121: if ($@) {
122: $errorstring.=&mt("Evaluation Error: ").$@;
123: $Apache::lontexconvert::messedup=1;
124: }
125: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
126: $errorstring) {
127: &Apache::lonnet::logthis("Trying to kill myself");
128: $Apache::lontexconvert::messedup=1;
129: if (ref($Apache::lonxml::request)) {
130: $Apache::lonxml::request->child_terminate();
131: } else {
132: my $request;
133: eval { $request=Apache->request; };
134: if (!$request) {
135: eval { $request=Apache2::RequestUtil->request; };
136: }
137: if ($request) {
138: $request->child_terminate();
139: } else {
140: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
141: }
142: }
143: }
144: return $xmlstring;
145: }
146:
147: sub clean_out_math_mode {
148: my ($texstring)=@_;
149: $$texstring=~s/(?!\\)\$//g;
150: $$texstring=~s/\\[\)\(\]\[]//g;
151: $$texstring=~s/\\ensuremath//g;
152: return '';
153: }
154:
155: sub displaystyle {
156: my ($texstring)=@_;
157: #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
158: if ($$texstring=~/[^\\]\$\$/ ||
159: $$texstring=~/\\\[/ ||
160: $$texstring=~/\\displaystyle/) { return 1; }
161: return 0;
162: }
163:
164: sub jsMath_converted {
165: my $texstring=shift;
166: my $tag='span';
167: if (&displaystyle($texstring)) { $tag='div'; }
168: &clean_out_math_mode($texstring);
169: return &jsMath_header().
170: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
171: }
172:
173: {
174: my $jsMath_sent_header;
175: sub jsMath_reset {
176: $jsMath_sent_header=0;
177: }
178: sub jsMath_header {
179: return '' if $jsMath_sent_header;
180: $jsMath_sent_header=1;
181: return
182: '<script type="text/javascript">
183: function NoFontMessage () {}
184: </script>'."\n".
185: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
186: }
187: sub jsMath_process {
188: return '' if !$jsMath_sent_header;
189: return '<script type="text/javascript">jsMath.Process()</script>';
190: }
191: }
192:
193: sub mimetex_converted {
194: my $texstring=shift;
195: my $displaystyle=&displaystyle($texstring);
196:
197: &clean_out_math_mode($texstring);
198:
199: if ($displaystyle) {
200: $$texstring='\\displaystyle \\Large '.$$texstring;
201: }
202: my $result='<img src="/cgi-bin/mimetex.cgi?'.&Apache::lonnet::escape($$texstring).'" />';
203: if ($displaystyle) {
204: $result='<center>'.$result.'</center>';
205: }
206: return $result;
207: }
208:
209: sub converted {
210: my ($string,$mode)=@_;
211: if ($mode eq '') { $mode=$env{'environment.texengine'}; }
212: if ($mode =~ /tth/i) {
213: return &tth_converted($string);
214: } elsif ($mode =~ /jsmath/i) {
215: return &jsMath_converted($string);
216: } elsif ($mode =~ /mimetex/i) {
217: return &mimetex_converted($string);
218: }
219: return &tth_converted($string);
220: }
221:
222: # ------------------------------------------------------------ Message display
223:
224: sub to_convert {
225: my ($string) = @_;
226: $string=~s/\<br\s*\/?\>/ /gs;
227: # $string=~s/\s/ /gs;
228: $string=&HTML::Entities::decode($string);
229: return &converted(\$string);
230: }
231:
232: sub smiley {
233: my $expression=shift;
234: if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
235: my %smileys=('\:\-\)' => 'smiley',
236: '8\-\)' => 'coolsmile',
237: '8\-(I|\|)' => 'coolindiff',
238: ':\-(I|\|)' => 'neutral',
239: '\:\-(o|O|\(\))' => 'shocked',
240: ':\-\(' => 'frowny',
241: '\;\-\)' => 'wink',
242: '\:\-P' => 'baeh',
243: '\:\-(\\\|\\/)' => 'hrrm',
244: '\:\-D' => 'bigsmile',
245: '\:\-C' => 'angry',
246: '\:(\'|\`)\-\(' => 'cry',
247: '\:\-(X|\#)' => 'lipsrsealed',
248: '\:\-S' => 'huh');
249: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
250: foreach (keys %smileys) {
251: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
252: }
253: return $expression;
254: }
255:
256: sub msgtexconverted {
257: my ($message,$email) = @_;
258: $errorstring='';
259: &init_tth();
260: my $outmessage='';
261: my $tex=0;
262: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
263: if ($tex) {
264: if ($email) {
265: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
266: } else {
267: $outmessage.=&to_convert($_); $tex=0;
268: }
269: } else {
270: $outmessage.=&smiley($_); $tex=1;
271: }
272: }
273: $message=$outmessage; $outmessage=''; $tex=0;
274: foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) {
275: if ($tex) {
276: if ($email) {
277: $outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0;
278: } else {
279: $outmessage.=&algebra($_,'web'); $tex=0;
280: }
281: } else {
282: $outmessage.=$_; $tex=1;
283: }
284: }
285: if (wantarray) {
286: return ($outmessage,$errorstring);
287: } else {
288: return $outmessage.$errorstring;
289: }
290: }
291:
292: sub algebra {
293: use AlgParser;
294:
295: my ($string,$target,$style)=@_;
296: my $parser = new AlgParserWithImplicitExpand;
297: $string=&prepare_algebra($string);
298: my $ret = $parser->parse($string);
299: my $result='['.&mt('Algebra unconverted due to previous errors').']';
300: if ( ref($ret) ) {
301: #$parser->tostring();
302: $parser->normalize();
303: my $latex=$parser->tolatex();
304: $latex=&postprocess_algebra($latex);
305: if ($style eq 'display') {
306: $latex='$$'.$latex.'$$x';
307: } else {
308: # style is 'inline'
309: $latex='\\ensuremath{'.$latex.'}';
310: }
311: if ($target eq 'web' || $target eq 'analyze') {
312: $result = &converted(\$latex);
313: } else {
314: $result = $latex;
315: }
316: } else {
317: &Apache::lonxml::error($parser->{'htmlerror'});
318: }
319: }
320:
321: sub prepare_algebra {
322: my ($string)=@_;
323:
324: # makes the decision about what is a minus sign easier supposedly
325: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
326:
327: return $string;
328: }
329:
330: sub postprocess_algebra {
331: my ($string)=@_;
332:
333: # moodle had these and I don't know why, ignoring them for now
334: # $string =~s/\\fun/ /g;
335:
336: # remove the extra () in the denominator of a \frac
337: $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
338:
339: # sqrt(3,4) means the 4 root of 3
340: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
341:
342: # log(3,4) means the log base 4 of 3
343: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
344:
345: # log(3,4) means the log base 4 of 3
346: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
347:
348: # int(3,a,b) integral from a to b of 3
349: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
350:
351: # int( ... dx) -> ...
352: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
353:
354: #
355: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
356: return $string;
357: }
358: 1;
359: __END__
360:
361:
362:
363:
364:
365:
366:
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