Annotation of loncom/xml/lontexconvert.pm, revision 1.88
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.88 ! raeburn 4: # $Id: lontexconvert.pm,v 1.87 2008/02/06 10:16:00 foxr Exp $
1.4 www 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: #
1.1 harris41 39:
40: package Apache::lontexconvert;
41:
42: use strict;
1.33 albertel 43: use tth();
1.1 harris41 44: use vars qw($errorstring);
1.73 albertel 45: #use Apache::lonxml();
1.33 albertel 46: use Apache::lonlocal;
1.65 albertel 47: use Apache::lonnet;
1.75 www 48: use lib '/home/httpd/lib/perl/';
49: use LONCAPA;
50:
1.1 harris41 51:
52: # ====================================================================== Header
53:
1.29 albertel 54: sub init_tth {
1.65 albertel 55: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
1.74 albertel 56: if ($options =~ /\S/) {
57: $options = ' '.$options;
58: } else {
59: undef($options);
60: }
1.65 albertel 61: if ($env{'browser.mathml'}) {
1.29 albertel 62: &tth::ttminit();
1.65 albertel 63: if ($env{'browser.unicode'}) {
1.74 albertel 64: &tth::ttmoptions('-L -u1'.$options);
1.29 albertel 65: } else {
1.74 albertel 66: &tth::ttmoptions('-L -u0'.$options);
1.29 albertel 67: }
68: } else {
69: &tth::tthinit();
1.65 albertel 70: if ($env{'browser.unicode'}) {
1.74 albertel 71: &tth::tthoptions('-L -u1'.$options);
1.29 albertel 72: } else {
1.74 albertel 73: &tth::tthoptions('-L -u0'.$options);
1.29 albertel 74: }
75: }
76: }
77:
1.1 harris41 78: # ================================================================== Conversion
79:
1.19 albertel 80: $Apache::lontexconvert::messedup=0;
1.36 albertel 81:
82: # we need this routine because &converted can get called from inside
83: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
84: # allow the opcode for alarm, so we need to compile this before we get
85: # into the safe space since opcode checks only occur at compile time
86: sub convert_real {
87: my ($texstring)=@_;
88: my ($xmlstring,$errorstring);
89: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
90: local $SIG{ALRM}=sub {
1.37 albertel 91: &Apache::lonnet::logthis("ALRM");
1.36 albertel 92: $xmlstring='['.&mt("TeX unconverted due to errors").']';
93: $Apache::lontexconvert::messedup=1;
94: die &mt("TeX unconverted due to errors");
95: };
1.63 albertel 96: &Apache::lonxml::start_alarm();
1.65 albertel 97: if ($env{'browser.mathml'}) {
1.36 albertel 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: }
1.43 www 108: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 109: $xmlstring=~s/^\s*//;
110: $xmlstring=~s/\s*$//;
1.85 foxr 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: #
1.87 foxr 116: my $lrharpoon = pack("U", 0x21cc);
117: $xmlstring=~s/\\rightleftharpoons/$lrharpoon/g;
1.85 foxr 118:
1.63 albertel 119: &Apache::lonxml::end_alarm();
1.36 albertel 120: return ($xmlstring,$errorstring);
121: }
122:
1.59 albertel 123: sub tth_converted {
1.31 albertel 124: my $texstring=shift;
1.34 www 125: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 126: if ($Apache::lontexconvert::messedup) {
1.35 albertel 127: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 128: }
1.59 albertel 129: $$texstring ='\\documentstyle{article}'.$$texstring;
130:
1.31 albertel 131: eval(<<'ENDCONV');
1.36 albertel 132: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 133: ENDCONV
1.32 albertel 134: if ($@) {
1.35 albertel 135: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 136: $Apache::lontexconvert::messedup=1;
137: }
1.37 albertel 138: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
139: $errorstring) {
1.31 albertel 140: &Apache::lonnet::logthis("Trying to kill myself");
141: $Apache::lontexconvert::messedup=1;
1.70 albertel 142: if (ref($Apache::lonxml::request)) {
143: $Apache::lonxml::request->child_terminate();
144: } else {
145: my $request;
146: eval { $request=Apache->request; };
147: if (!$request) {
148: eval { $request=Apache2::RequestUtil->request; };
149: }
150: if ($request) {
151: $request->child_terminate();
152: } else {
153: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
154: }
155: }
1.31 albertel 156: }
157: return $xmlstring;
1.1 harris41 158: }
159:
1.62 albertel 160: sub clean_out_math_mode {
161: my ($texstring)=@_;
1.82 albertel 162: $$texstring=~s/(?<!\\)\$//g;
1.62 albertel 163: $$texstring=~s/\\[\)\(\]\[]//g;
164: $$texstring=~s/\\ensuremath//g;
165: return '';
166: }
167:
168: sub displaystyle {
169: my ($texstring)=@_;
170: #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
171: if ($$texstring=~/[^\\]\$\$/ ||
172: $$texstring=~/\\\[/ ||
173: $$texstring=~/\\displaystyle/) { return 1; }
174: return 0;
175: }
176:
1.59 albertel 177: sub jsMath_converted {
178: my $texstring=shift;
179: my $tag='span';
1.62 albertel 180: if (&displaystyle($texstring)) { $tag='div'; }
181: &clean_out_math_mode($texstring);
1.67 albertel 182: return &jsMath_header().
183: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
184: }
185:
186: {
1.76 albertel 187: my @jsMath_sent_header;
1.67 albertel 188: sub jsMath_reset {
1.76 albertel 189: undef(@jsMath_sent_header);
190: }
191: sub jsMath_push {
192: push(@jsMath_sent_header,0);
1.67 albertel 193: }
194: sub jsMath_header {
1.80 albertel 195: if (!@jsMath_sent_header) {
196: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
197: return '';
198: }
1.76 albertel 199: return '' if $jsMath_sent_header[-1];
200: $jsMath_sent_header[-1]=1;
1.67 albertel 201: return
202: '<script type="text/javascript">
203: function NoFontMessage () {}
1.78 albertel 204: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67 albertel 205: </script>'."\n".
1.71 albertel 206: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67 albertel 207: }
208: sub jsMath_process {
1.76 albertel 209: my $state = pop(@jsMath_sent_header);
210: return '' if !$state;
1.81 albertel 211: return "\n".
212: '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67 albertel 213: }
1.84 albertel 214: sub jsMath_state {
215: my ($level) = @_;
216: return $jsMath_sent_header[$level];
217: }
1.62 albertel 218: }
219:
1.83 albertel 220: sub tex_engine {
221: if (exists($env{'form.texengine'})) {
1.88 ! raeburn 222: if ($env{'form.texengine'} ne '') {
! 223: return $env{'form.texengine'};
! 224: }
1.83 albertel 225: }
226: if ($env{'request.course.id'}
227: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
228: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
229: }
230: if (exists($env{'environment.texengine'})) {
231: return $env{'environment.texengine'};
232: }
233: return 'tth';
234: }
235:
1.72 albertel 236: sub init_math_support {
1.84 albertel 237: my ($inherit_jsmath) = @_;
1.73 albertel 238: &init_tth();
1.76 albertel 239: &Apache::lontexconvert::jsMath_push();
1.84 albertel 240: if (lc(&tex_engine()) eq 'jsmath' ||
241: ($inherit_jsmath && &jsMath_state(-2))) {
1.72 albertel 242: return &Apache::lontexconvert::jsMath_header();
243: }
244: return;
245: }
246:
1.62 albertel 247: sub mimetex_converted {
248: my $texstring=shift;
249: my $displaystyle=&displaystyle($texstring);
250:
251: &clean_out_math_mode($texstring);
252:
253: if ($displaystyle) {
254: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 255: }
1.75 www 256: my $result='<img src="/cgi-bin/mimetex.cgi?'.&escape($$texstring).'" />';
1.62 albertel 257: if ($displaystyle) {
258: $result='<center>'.$result.'</center>';
259: }
260: return $result;
1.59 albertel 261: }
262:
263: sub converted {
1.67 albertel 264: my ($string,$mode)=@_;
1.83 albertel 265: if ($mode eq '') { $mode = &tex_engine(); }
1.68 albertel 266: if ($mode =~ /tth/i) {
1.67 albertel 267: return &tth_converted($string);
1.68 albertel 268: } elsif ($mode =~ /jsmath/i) {
1.67 albertel 269: return &jsMath_converted($string);
1.68 albertel 270: } elsif ($mode =~ /mimetex/i) {
1.67 albertel 271: return &mimetex_converted($string);
1.59 albertel 272: }
1.67 albertel 273: return &tth_converted($string);
1.59 albertel 274: }
275:
1.6 www 276: # ------------------------------------------------------------ Message display
277:
1.9 albertel 278: sub to_convert {
279: my ($string) = @_;
1.22 www 280: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 281: # $string=~s/\s/ /gs;
1.18 albertel 282: $string=&HTML::Entities::decode($string);
1.9 albertel 283: return &converted(\$string);
284: }
285:
1.20 www 286: sub smiley {
1.31 albertel 287: my $expression=shift;
1.65 albertel 288: if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
1.31 albertel 289: my %smileys=('\:\-\)' => 'smiley',
290: '8\-\)' => 'coolsmile',
291: '8\-(I|\|)' => 'coolindiff',
292: ':\-(I|\|)' => 'neutral',
293: '\:\-(o|O|\(\))' => 'shocked',
294: ':\-\(' => 'frowny',
295: '\;\-\)' => 'wink',
296: '\:\-P' => 'baeh',
297: '\:\-(\\\|\\/)' => 'hrrm',
298: '\:\-D' => 'bigsmile',
299: '\:\-C' => 'angry',
300: '\:(\'|\`)\-\(' => 'cry',
301: '\:\-(X|\#)' => 'lipsrsealed',
302: '\:\-S' => 'huh');
303: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79 albertel 304: foreach my $smiley (keys(%smileys)) {
305: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}.gif" \/\>/gs;
1.31 albertel 306: }
307: return $expression;
1.20 www 308: }
309:
1.6 www 310: sub msgtexconverted {
1.39 raeburn 311: my ($message,$email) = @_;
1.17 albertel 312: $errorstring='';
1.29 albertel 313: &init_tth();
1.25 www 314: my $outmessage='';
315: my $tex=0;
1.79 albertel 316: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
1.25 www 317: if ($tex) {
1.30 albertel 318: if ($email) {
1.79 albertel 319: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
320: $tex=0;
1.30 albertel 321: } else {
1.79 albertel 322: $outmessage.=&to_convert($fragment);
323: $tex=0;
1.30 albertel 324: }
1.25 www 325: } else {
1.79 albertel 326: $outmessage.=&smiley($fragment);
327: $tex=1;
1.25 www 328: }
329: }
1.64 albertel 330: $message=$outmessage; $outmessage=''; $tex=0;
1.79 albertel 331: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
332: $message)) {
1.64 albertel 333: if ($tex) {
334: if ($email) {
1.79 albertel 335: $outmessage.='</pre><tt>'.&algebra($fragment,'web').'</tt><pre>';
336: $tex=0;
1.64 albertel 337: } else {
1.79 albertel 338: $outmessage.=&algebra($fragment,'web');
339: $tex=0;
1.64 albertel 340: }
341: } else {
1.79 albertel 342: $outmessage.=$fragment;
343: $tex=1;
1.64 albertel 344: }
345: }
1.24 albertel 346: if (wantarray) {
1.25 www 347: return ($outmessage,$errorstring);
1.24 albertel 348: } else {
1.25 www 349: return $outmessage.$errorstring;
1.24 albertel 350: }
1.1 harris41 351: }
352:
1.44 albertel 353: sub algebra {
1.49 albertel 354: use AlgParser;
355:
1.58 albertel 356: my ($string,$target,$style)=@_;
1.44 albertel 357: my $parser = new AlgParserWithImplicitExpand;
1.46 albertel 358: $string=&prepare_algebra($string);
1.44 albertel 359: my $ret = $parser->parse($string);
360: my $result='['.&mt('Algebra unconverted due to previous errors').']';
361: if ( ref($ret) ) {
1.50 albertel 362: #$parser->tostring();
1.44 albertel 363: $parser->normalize();
364: my $latex=$parser->tolatex();
1.49 albertel 365: $latex=&postprocess_algebra($latex);
1.58 albertel 366: if ($style eq 'display') {
367: $latex='$$'.$latex.'$$x';
368: } else {
1.61 albertel 369: # style is 'inline'
1.58 albertel 370: $latex='\\ensuremath{'.$latex.'}';
371: }
1.44 albertel 372: if ($target eq 'web' || $target eq 'analyze') {
373: $result = &converted(\$latex);
374: } else {
375: $result = $latex;
376: }
377: } else {
378: &Apache::lonxml::error($parser->{'htmlerror'});
379: }
380: }
381:
1.46 albertel 382: sub prepare_algebra {
383: my ($string)=@_;
384:
1.50 albertel 385: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 386: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 387:
1.46 albertel 388: return $string;
389: }
390:
391: sub postprocess_algebra {
392: my ($string)=@_;
1.48 albertel 393:
1.50 albertel 394: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 395: # $string =~s/\\fun/ /g;
1.47 albertel 396:
1.51 albertel 397: # sqrt(3,4) means the 4 root of 3
1.52 albertel 398: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
399:
1.53 albertel 400: # log(3,4) means the log base 4 of 3
401: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
402:
1.54 albertel 403: # log(3,4) means the log base 4 of 3
404: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
405:
1.55 albertel 406: # int(3,a,b) integral from a to b of 3
407: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
408:
409: # int( ... dx) -> ...
410: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 411:
1.56 albertel 412: #
413: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 414: return $string;
415: }
1.1 harris41 416: 1;
417: __END__
418:
419:
420:
421:
422:
423:
424:
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