1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
4: # $Id: lontexconvert.pm,v 1.68 2005/08/16 16:29:53 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: $$texstring=~/\\displaystyle/) { return 1; }
160: return 0;
161: }
162:
163: sub jsMath_converted {
164: my $texstring=shift;
165: my $tag='span';
166: if (&displaystyle($texstring)) { $tag='div'; }
167: &clean_out_math_mode($texstring);
168: return &jsMath_header().
169: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
170: }
171:
172: {
173: my $jsMath_sent_header;
174: sub jsMath_reset {
175: $jsMath_sent_header=0;
176: }
177: sub jsMath_header {
178: return '' if $jsMath_sent_header;
179: $jsMath_sent_header=1;
180: return
181: '<script type="text/javascript">
182: function NoFontMessage () {}
183: </script>'."\n".
184: '<script src="/adm/jsMath/jsMath.js"></script>'."\n";
185: }
186: sub jsMath_process {
187: return '' if !$jsMath_sent_header;
188: return '<script type="text/javascript">jsMath.Process()</script>';
189: }
190: }
191:
192: sub mimetex_converted {
193: my $texstring=shift;
194: my $displaystyle=&displaystyle($texstring);
195:
196: &clean_out_math_mode($texstring);
197:
198: if ($displaystyle) {
199: $$texstring='\\displaystyle \\Large '.$$texstring;
200: }
201: my $result='<img src="/cgi-bin/mimetex.cgi?'.&Apache::lonnet::escape($$texstring).'" />';
202: if ($displaystyle) {
203: $result='<center>'.$result.'</center>';
204: }
205: return $result;
206: }
207:
208: sub converted {
209: my ($string,$mode)=@_;
210: if ($mode eq '') { $mode=$env{'environment.texengine'}; }
211: if ($mode =~ /tth/i) {
212: return &tth_converted($string);
213: } elsif ($mode =~ /jsmath/i) {
214: return &jsMath_converted($string);
215: } elsif ($mode =~ /mimetex/i) {
216: return &mimetex_converted($string);
217: }
218: return &tth_converted($string);
219: }
220:
221: # ====================================================================== Footer
222:
223: sub footer {
224: my $xmlstring='';
225: if ($env{'request.state'} eq 'construct') {
226: $xmlstring.='<address>'.$errorstring.'</address>';
227: } else {
228: &Apache::lonmsg::author_res_msg($env{'request.filename'},$errorstring);
229: }
230: # -------------------------------------------------------------------- End Body
231: $xmlstring.=&Apache::lonxml::xmlend();
232: return $xmlstring;
233: }
234:
235: # ------------------------------------------------------------ Message display
236:
237: sub to_convert {
238: my ($string) = @_;
239: $string=~s/\<br\s*\/?\>/ /gs;
240: # $string=~s/\s/ /gs;
241: $string=&HTML::Entities::decode($string);
242: return &converted(\$string);
243: }
244:
245: sub smiley {
246: my $expression=shift;
247: if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
248: my %smileys=('\:\-\)' => 'smiley',
249: '8\-\)' => 'coolsmile',
250: '8\-(I|\|)' => 'coolindiff',
251: ':\-(I|\|)' => 'neutral',
252: '\:\-(o|O|\(\))' => 'shocked',
253: ':\-\(' => 'frowny',
254: '\;\-\)' => 'wink',
255: '\:\-P' => 'baeh',
256: '\:\-(\\\|\\/)' => 'hrrm',
257: '\:\-D' => 'bigsmile',
258: '\:\-C' => 'angry',
259: '\:(\'|\`)\-\(' => 'cry',
260: '\:\-(X|\#)' => 'lipsrsealed',
261: '\:\-S' => 'huh');
262: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
263: foreach (keys %smileys) {
264: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
265: }
266: return $expression;
267: }
268:
269: sub msgtexconverted {
270: my ($message,$email) = @_;
271: $errorstring='';
272: &init_tth();
273: my $outmessage='';
274: my $tex=0;
275: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
276: if ($tex) {
277: if ($email) {
278: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
279: } else {
280: $outmessage.=&to_convert($_); $tex=0;
281: }
282: } else {
283: $outmessage.=&smiley($_); $tex=1;
284: }
285: }
286: $message=$outmessage; $outmessage=''; $tex=0;
287: foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) {
288: if ($tex) {
289: if ($email) {
290: $outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0;
291: } else {
292: $outmessage.=&algebra($_,'web'); $tex=0;
293: }
294: } else {
295: $outmessage.=$_; $tex=1;
296: }
297: }
298: if (wantarray) {
299: return ($outmessage,$errorstring);
300: } else {
301: return $outmessage.$errorstring;
302: }
303: }
304:
305: sub algebra {
306: use AlgParser;
307:
308: my ($string,$target,$style)=@_;
309: my $parser = new AlgParserWithImplicitExpand;
310: $string=&prepare_algebra($string);
311: my $ret = $parser->parse($string);
312: my $result='['.&mt('Algebra unconverted due to previous errors').']';
313: if ( ref($ret) ) {
314: #$parser->tostring();
315: $parser->normalize();
316: my $latex=$parser->tolatex();
317: $latex=&postprocess_algebra($latex);
318: if ($style eq 'display') {
319: $latex='$$'.$latex.'$$x';
320: } else {
321: # style is 'inline'
322: $latex='\\ensuremath{'.$latex.'}';
323: }
324: if ($target eq 'web' || $target eq 'analyze') {
325: $result = &converted(\$latex);
326: } else {
327: $result = $latex;
328: }
329: } else {
330: &Apache::lonxml::error($parser->{'htmlerror'});
331: }
332: }
333:
334: sub prepare_algebra {
335: my ($string)=@_;
336:
337: # makes the decision about what is a minus sign easier supposedly
338: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
339:
340: return $string;
341: }
342:
343: sub postprocess_algebra {
344: my ($string)=@_;
345:
346: # moodle had these and I don't know why, ignoring them for now
347: # $string =~s/\\fun/ /g;
348:
349: # remove the extra () in the denominator of a \frac
350: $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
351:
352: # sqrt(3,4) means the 4 root of 3
353: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
354:
355: # log(3,4) means the log base 4 of 3
356: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
357:
358: # log(3,4) means the log base 4 of 3
359: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
360:
361: # int(3,a,b) integral from a to b of 3
362: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
363:
364: # int( ... dx) -> ...
365: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
366:
367: #
368: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
369: return $string;
370: }
371: 1;
372: __END__
373:
374:
375:
376:
377:
378:
379:
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