1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.66 2005/06/09 02:17:11 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: 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: sub header {
74: $errorstring='';
75: my $time=time;
76: &init_tth();
77: return &Apache::lonxml::xmlbegin().
78: "\n<head>\n".
79: &Apache::lonxml::fontsettings().
80: &Apache::lonmenu::registerurl(undef,'tex').
81: "\n</head>\n";
82: }
83:
84: # ================================================================== Conversion
85:
86: $Apache::lontexconvert::messedup=0;
87:
88: # we need this routine because &converted can get called from inside
89: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
90: # allow the opcode for alarm, so we need to compile this before we get
91: # into the safe space since opcode checks only occur at compile time
92: sub convert_real {
93: my ($texstring)=@_;
94: my ($xmlstring,$errorstring);
95: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
96: local $SIG{ALRM}=sub {
97: &Apache::lonnet::logthis("ALRM");
98: $xmlstring='['.&mt("TeX unconverted due to errors").']';
99: $Apache::lontexconvert::messedup=1;
100: die &mt("TeX unconverted due to errors");
101: };
102: &Apache::lonxml::start_alarm();
103: if ($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*\<br clear\=\"all\"/\<br/s;
115: $xmlstring=~s/^\s*//;
116: $xmlstring=~s/\s*$//;
117: &Apache::lonxml::end_alarm();
118: return ($xmlstring,$errorstring);
119: }
120:
121: sub tth_converted {
122: my $texstring=shift;
123: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
124: if ($Apache::lontexconvert::messedup) {
125: return '['.&mt('TeX unconverted due to previous errors').']';
126: }
127: $$texstring ='\\documentstyle{article}'.$$texstring;
128:
129: eval(<<'ENDCONV');
130: ($xmlstring,$errorstring)=&convert_real($texstring)
131: ENDCONV
132: if ($@) {
133: $errorstring.=&mt("Evaluation Error: ").$@;
134: $Apache::lontexconvert::messedup=1;
135: }
136: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
137: $errorstring) {
138: &Apache::lonnet::logthis("Trying to kill myself");
139: $Apache::lontexconvert::messedup=1;
140: my $request=Apache->request();
141: $request->child_terminate();
142: }
143: return $xmlstring;
144: }
145:
146: sub clean_out_math_mode {
147: my ($texstring)=@_;
148: $$texstring=~s/(?!\\)\$//g;
149: $$texstring=~s/\\[\)\(\]\[]//g;
150: $$texstring=~s/\\ensuremath//g;
151: return '';
152: }
153:
154: sub displaystyle {
155: my ($texstring)=@_;
156: #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
157: if ($$texstring=~/[^\\]\$\$/ ||
158: $$texstring=~/\\\[/ ||
159: $$texstring=~/\\displaystyle/) { return 1; }
160: return 0;
161: }
162:
163: sub jsMath_converted {
164: my $texstring=shift;
165: my $tag='span';
166: if (&displaystyle($texstring)) { $tag='div'; }
167: &clean_out_math_mode($texstring);
168: return '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
169: }
170:
171: sub mimetex_converted {
172: my $texstring=shift;
173: my $displaystyle=&displaystyle($texstring);
174:
175: &clean_out_math_mode($texstring);
176:
177: if ($displaystyle) {
178: $$texstring='\\displaystyle \\Large '.$$texstring;
179: }
180: my $result='<img src="/cgi-bin/mimetex.cgi?'.&Apache::lonnet::escape($$texstring).'" />';
181: if ($displaystyle) {
182: $result='<center>'.$result.'</center>';
183: }
184: return $result;
185: }
186:
187: sub converted {
188: if ($env{'environment.texengine'} eq 'tth') {
189: return &tth_converted;
190: } elsif ($env{'environment.texengine'} eq 'jsMath') {
191: return &jsMath_converted;
192: } elsif ($env{'environment.texengine'} eq 'mimetex') {
193: return &mimetex_converted;
194: }
195: return &tth_converted;
196: }
197:
198: # ====================================================================== Footer
199:
200: sub footer {
201: my $xmlstring='';
202: if ($env{'request.state'} eq 'construct') {
203: $xmlstring.='<address>'.$errorstring.'</address>';
204: } else {
205: &Apache::lonmsg::author_res_msg($env{'request.filename'},$errorstring);
206: }
207: # -------------------------------------------------------------------- End Body
208: $xmlstring.=&Apache::lonxml::xmlend();
209: return $xmlstring;
210: }
211:
212: # ------------------------------------------------------------ Message display
213:
214: sub to_convert {
215: my ($string) = @_;
216: $string=~s/\<br\s*\/?\>/ /gs;
217: # $string=~s/\s/ /gs;
218: $string=&HTML::Entities::decode($string);
219: return &converted(\$string);
220: }
221:
222: sub smiley {
223: my $expression=shift;
224: if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
225: my %smileys=('\:\-\)' => 'smiley',
226: '8\-\)' => 'coolsmile',
227: '8\-(I|\|)' => 'coolindiff',
228: ':\-(I|\|)' => 'neutral',
229: '\:\-(o|O|\(\))' => 'shocked',
230: ':\-\(' => 'frowny',
231: '\;\-\)' => 'wink',
232: '\:\-P' => 'baeh',
233: '\:\-(\\\|\\/)' => 'hrrm',
234: '\:\-D' => 'bigsmile',
235: '\:\-C' => 'angry',
236: '\:(\'|\`)\-\(' => 'cry',
237: '\:\-(X|\#)' => 'lipsrsealed',
238: '\:\-S' => 'huh');
239: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
240: foreach (keys %smileys) {
241: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
242: }
243: return $expression;
244: }
245:
246: sub msgtexconverted {
247: my ($message,$email) = @_;
248: $errorstring='';
249: &init_tth();
250: my $outmessage='';
251: my $tex=0;
252: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
253: if ($tex) {
254: if ($email) {
255: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
256: } else {
257: $outmessage.=&to_convert($_); $tex=0;
258: }
259: } else {
260: $outmessage.=&smiley($_); $tex=1;
261: }
262: }
263: $message=$outmessage; $outmessage=''; $tex=0;
264: foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) {
265: if ($tex) {
266: if ($email) {
267: $outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0;
268: } else {
269: $outmessage.=&algebra($_,'web'); $tex=0;
270: }
271: } else {
272: $outmessage.=$_; $tex=1;
273: }
274: }
275: if (wantarray) {
276: return ($outmessage,$errorstring);
277: } else {
278: return $outmessage.$errorstring;
279: }
280: }
281:
282: sub algebra {
283: use AlgParser;
284:
285: my ($string,$target,$style)=@_;
286: my $parser = new AlgParserWithImplicitExpand;
287: $string=&prepare_algebra($string);
288: my $ret = $parser->parse($string);
289: my $result='['.&mt('Algebra unconverted due to previous errors').']';
290: if ( ref($ret) ) {
291: #$parser->tostring();
292: $parser->normalize();
293: my $latex=$parser->tolatex();
294: $latex=&postprocess_algebra($latex);
295: if ($style eq 'display') {
296: $latex='$$'.$latex.'$$x';
297: } else {
298: # style is 'inline'
299: $latex='\\ensuremath{'.$latex.'}';
300: }
301: if ($target eq 'web' || $target eq 'analyze') {
302: $result = &converted(\$latex);
303: } else {
304: $result = $latex;
305: }
306: } else {
307: &Apache::lonxml::error($parser->{'htmlerror'});
308: }
309: }
310:
311: sub prepare_algebra {
312: my ($string)=@_;
313:
314: # makes the decision about what is a minus sign easier supposedly
315: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
316:
317: return $string;
318: }
319:
320: sub postprocess_algebra {
321: my ($string)=@_;
322:
323: # moodle had these and I don't know why, ignoring them for now
324: # $string =~s/\\fun/ /g;
325:
326: # remove the extra () in the denominator of a \frac
327: $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
328:
329: # sqrt(3,4) means the 4 root of 3
330: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
331:
332: # log(3,4) means the log base 4 of 3
333: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
334:
335: # log(3,4) means the log base 4 of 3
336: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
337:
338: # int(3,a,b) integral from a to b of 3
339: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
340:
341: # int( ... dx) -> ...
342: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
343:
344: #
345: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
346: return $string;
347: }
348: 1;
349: __END__
350:
351:
352:
353:
354:
355:
356:
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