Annotation of loncom/xml/lontexconvert.pm, revision 1.111
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.111 ! foxr 4: # $Id: lontexconvert.pm,v 1.110 2012/02/28 10:38:14 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($errorstring);
1.73 albertel 45: #use Apache::lonxml();
1.33 albertel 46: use Apache::lonlocal;
1.65 albertel 47: use Apache::lonnet;
1.75 www 48: use lib '/home/httpd/lib/perl/';
49: use LONCAPA;
1.94 raeburn 50: use URI::Escape;
51: use IO::Socket::INET;
1.1 harris41 52:
1.110 foxr 53:
54: #
55: # Table of substitutions to unicode characters.
56: #
57: my %unicode_translations = (
58: '\rightleftharpoons' => 0x21cc,
1.111 ! foxr 59:
! 60: # Brackets - unicode is commented out with pure 8-bit ascii ugliness while we need it.
! 61:
! 62: # '' => 0x23a1,
! 63: # '' => 0x23a2,
! 64: # '' => 0x23a3, # when unicode catches up with browsers
! 65: # '' => 0x23a4, # use these instead of the cheesey brackets below
! 66: # '' => 0x23a5,
! 67: # '' => 0x23a6
! 68: '' => 0x5b,
! 69: '' => 0x5b, # '['
! 70: '' => 0x5b,
! 71: '' => 0x5d, # ']'
! 72: '' => 0x5d,
! 73: '' => 0x5d,
! 74:
! 75: # Parens..again the unicode is commented out with the 8-bit ascii ugliness
! 76: # turned on until browsers catch up with the unicode world.
! 77:
! 78: # '' => 0x239b,
! 79: # '' => 0x239c,
! 80: # '' => 0x239d,
! 81: # '' => 0x239e,
! 82: # '' => 0x239f,
! 83: # '' => 0x23a0
! 84:
! 85: '' => 0x28,
! 86: '' => 0x28, # '('
! 87: '' => 0x28,
! 88:
! 89: '' => 0x29,
! 90: '' => 0x29, # '('
! 91: '' => 0x29
! 92:
! 93:
1.110 foxr 94: );
95:
96: ##
97: # Utility to convert elements of a string to unicode:
98: #
99: # @param input - Input string
100: # @param pattern - Pattern to convert
101: # @param unicode - Unicode to substitute for pattern.
102: #
103: # @return string - resulting string.
104: #
105: sub unicode_subst {
106: my ($input, $pattern, $unicode) = @_;
107:
108: my $char = pack('U', $unicode);
109:
110: $input =~ s/$pattern/$char/g;
111:
112: return $input;
113: }
114:
1.1 harris41 115: # ====================================================================== Header
116:
1.29 albertel 117: sub init_tth {
1.65 albertel 118: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
1.74 albertel 119: if ($options =~ /\S/) {
120: $options = ' '.$options;
121: } else {
122: undef($options);
123: }
1.65 albertel 124: if ($env{'browser.mathml'}) {
1.29 albertel 125: &tth::ttminit();
1.65 albertel 126: if ($env{'browser.unicode'}) {
1.74 albertel 127: &tth::ttmoptions('-L -u1'.$options);
1.29 albertel 128: } else {
1.74 albertel 129: &tth::ttmoptions('-L -u0'.$options);
1.29 albertel 130: }
131: } else {
132: &tth::tthinit();
1.65 albertel 133: if ($env{'browser.unicode'}) {
1.74 albertel 134: &tth::tthoptions('-L -u1'.$options);
1.29 albertel 135: } else {
1.74 albertel 136: &tth::tthoptions('-L -u0'.$options);
1.29 albertel 137: }
138: }
139: }
140:
1.1 harris41 141: # ================================================================== Conversion
142:
1.19 albertel 143: $Apache::lontexconvert::messedup=0;
1.36 albertel 144:
1.91 jms 145:
1.36 albertel 146: sub convert_real {
147: my ($texstring)=@_;
148: my ($xmlstring,$errorstring);
149: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
150: local $SIG{ALRM}=sub {
1.37 albertel 151: &Apache::lonnet::logthis("ALRM");
1.36 albertel 152: $xmlstring='['.&mt("TeX unconverted due to errors").']';
153: $Apache::lontexconvert::messedup=1;
154: die &mt("TeX unconverted due to errors");
155: };
1.63 albertel 156: &Apache::lonxml::start_alarm();
1.65 albertel 157: if ($env{'browser.mathml'}) {
1.110 foxr 158: &Apache::lonnet::logthis("mathml");
1.36 albertel 159: $xmlstring=&tth::ttm($$texstring);
160: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
161: $xmlstring=~s/\<br\>/\<br\/\>/g;
162: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
163: $errorstring.=&tth::ttmerror();
164: } else {
1.110 foxr 165: &Apache::lonnet::logthis("tth");
1.36 albertel 166: $xmlstring=&tth::tth($$texstring);
167: $errorstring.=&tth::ttherror();
168: $xmlstring=~s-</font(\s*)>-</font>-g;
169: }
1.43 www 170: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 171: $xmlstring=~s/^\s*//;
172: $xmlstring=~s/\s*$//;
1.110 foxr 173: &Apache::lonxml::end_alarm();
174:
1.85 foxr 175: #
1.110 foxr 176: # Several strings produced by tth require
177: # transliteration -> unicode equivalents to render reliably
178: # in browsers. %unicode_translations is a table of
179: # string->substitution which we now apply:
180:
181: foreach my $pattern (keys(%unicode_translations)) {
182: my $unicode = $unicode_translations{$pattern};
183: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode);
184: }
185:
1.85 foxr 186:
1.36 albertel 187: return ($xmlstring,$errorstring);
188: }
189:
1.59 albertel 190: sub tth_converted {
1.31 albertel 191: my $texstring=shift;
1.34 www 192: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 193: if ($Apache::lontexconvert::messedup) {
1.35 albertel 194: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 195: }
1.59 albertel 196: $$texstring ='\\documentstyle{article}'.$$texstring;
197:
1.31 albertel 198: eval(<<'ENDCONV');
1.36 albertel 199: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 200: ENDCONV
1.32 albertel 201: if ($@) {
1.35 albertel 202: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 203: $Apache::lontexconvert::messedup=1;
204: }
1.37 albertel 205: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
206: $errorstring) {
1.31 albertel 207: &Apache::lonnet::logthis("Trying to kill myself");
208: $Apache::lontexconvert::messedup=1;
1.70 albertel 209: if (ref($Apache::lonxml::request)) {
210: $Apache::lonxml::request->child_terminate();
211: } else {
212: my $request;
213: eval { $request=Apache->request; };
214: if (!$request) {
215: eval { $request=Apache2::RequestUtil->request; };
216: }
217: if ($request) {
218: $request->child_terminate();
219: } else {
220: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
221: }
222: }
1.31 albertel 223: }
224: return $xmlstring;
1.1 harris41 225: }
226:
1.62 albertel 227: sub clean_out_math_mode {
228: my ($texstring)=@_;
1.82 albertel 229: $$texstring=~s/(?<!\\)\$//g;
1.62 albertel 230: $$texstring=~s/\\[\)\(\]\[]//g;
231: $$texstring=~s/\\ensuremath//g;
232: return '';
233: }
234:
235: sub displaystyle {
236: my ($texstring)=@_;
1.106 bisitz 237: #has a $$ or \[ or \displaystyle or eqnarray in it, guessinng it's display mode
1.62 albertel 238: if ($$texstring=~/[^\\]\$\$/ ||
1.106 bisitz 239: $$texstring=~/\\\[/ ||
240: $$texstring=~/\\displaystyle/ ||
241: $$texstring=~/eqnarray/
242: ) { return 1; }
1.62 albertel 243: return 0;
244: }
245:
1.109 dseaton 246: sub MathJax_converted {
247: my $texstring=shift;
248: my $tag='math/tex;';
249: if (&displaystyle($texstring)) { $tag='math/tex; mode=display'; }
250: &clean_out_math_mode($texstring);
251: return &MathJax_header().
252: '<script type="'.$tag.'">'.$$texstring.'</script>';
253: }
254:
255: {
256: #Relies heavily on the previous jsMath installation
257: my @MathJax_sent_header;
258: sub MathJax_reset {
259: undef(@MathJax_sent_header);
260: }
261: sub MathJax_push {
262: push(@MathJax_sent_header,0);
263: }
264: sub MathJax_header {
265: if (!@MathJax_sent_header) {
266: &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
267: return '';
268: }
269: return '' if $MathJax_sent_header[-1];
270: $MathJax_sent_header[-1]=1;
271: return
272: '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
273: }
274: #sub MathJax_process {
275: # my $state = pop(@MathJax_sent_header);
276: # return '' if !$state;
277: # return "\n".
278: # '<script type="text/javascript">MathJax.Process()</script>'."\n";
279: #}
280: #sub MathJax_state {
281: # my ($level) = @_;
282: # return $MathJax_sent_header[$level];
283: #}
284: }
285:
286:
1.59 albertel 287: sub jsMath_converted {
288: my $texstring=shift;
289: my $tag='span';
1.62 albertel 290: if (&displaystyle($texstring)) { $tag='div'; }
291: &clean_out_math_mode($texstring);
1.67 albertel 292: return &jsMath_header().
293: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
294: }
295:
296: {
1.76 albertel 297: my @jsMath_sent_header;
1.67 albertel 298: sub jsMath_reset {
1.76 albertel 299: undef(@jsMath_sent_header);
300: }
301: sub jsMath_push {
302: push(@jsMath_sent_header,0);
1.67 albertel 303: }
304: sub jsMath_header {
1.80 albertel 305: if (!@jsMath_sent_header) {
306: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
307: return '';
308: }
1.76 albertel 309: return '' if $jsMath_sent_header[-1];
310: $jsMath_sent_header[-1]=1;
1.67 albertel 311: return
312: '<script type="text/javascript">
313: function NoFontMessage () {}
1.78 albertel 314: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67 albertel 315: </script>'."\n".
1.71 albertel 316: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67 albertel 317: }
318: sub jsMath_process {
1.76 albertel 319: my $state = pop(@jsMath_sent_header);
320: return '' if !$state;
1.81 albertel 321: return "\n".
322: '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67 albertel 323: }
1.84 albertel 324: sub jsMath_state {
325: my ($level) = @_;
326: return $jsMath_sent_header[$level];
327: }
1.62 albertel 328: }
329:
1.83 albertel 330: sub tex_engine {
331: if (exists($env{'form.texengine'})) {
1.88 raeburn 332: if ($env{'form.texengine'} ne '') {
333: return $env{'form.texengine'};
334: }
1.83 albertel 335: }
336: if ($env{'request.course.id'}
337: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
338: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
339: }
340: if (exists($env{'environment.texengine'})) {
341: return $env{'environment.texengine'};
342: }
343: return 'tth';
344: }
345:
1.72 albertel 346: sub init_math_support {
1.84 albertel 347: my ($inherit_jsmath) = @_;
1.73 albertel 348: &init_tth();
1.76 albertel 349: &Apache::lontexconvert::jsMath_push();
1.84 albertel 350: if (lc(&tex_engine()) eq 'jsmath' ||
351: ($inherit_jsmath && &jsMath_state(-2))) {
1.72 albertel 352: return &Apache::lontexconvert::jsMath_header();
353: }
1.109 dseaton 354: &Apache::lontexconvert::MathJax_push();
355: if (lc(&tex_engine()) eq 'mathjax') { # ||
356: #($inherit_jsmath && &jsMath_state(-2))) {
357: return &Apache::lontexconvert::MathJax_header();
358: }
1.72 albertel 359: return;
360: }
361:
1.92 hauer 362: sub mimetex_valign {
1.94 raeburn 363: my ($esc_texstring)=@_;
364: my $valign = 0;
365: my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
366: my $socket;
367: &Apache::lonxml::start_alarm();
1.108 raeburn 368: $socket = IO::Socket::INET->new(PeerAddr => 'localhost',
1.107 raeburn 369: PeerPort => 'http(80)',
370: Proto => 'tcp');
1.94 raeburn 371: if ($socket) {
1.96 raeburn 372: my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94 raeburn 373: print $socket $headreq;
374: while (<$socket>) {
375: if (/Vertical\-Align\:\s*?([\-\d]+)/) {
376: $valign = $1;
377: }
378: }
1.105 raeburn 379: $socket->close();
1.92 hauer 380: }
1.94 raeburn 381: &Apache::lonxml::end_alarm();
382: return $valign;
1.92 hauer 383: }
384:
1.62 albertel 385: sub mimetex_converted {
386: my $texstring=shift;
1.97 www 387:
388: # Alt-Argument for screen readers
389: my $alt_string=$$texstring;
390: $alt_string=~s/\"/\'\'/g;
391:
392: # Is this displaystyle?
393:
1.62 albertel 394: my $displaystyle=&displaystyle($texstring);
395:
1.97 www 396: # Remove math environment delimiters
397:
1.62 albertel 398: &clean_out_math_mode($texstring);
399:
400: if ($displaystyle) {
401: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 402: }
1.94 raeburn 403: my $esc_texstring = &uri_escape($$texstring);
404: my $valign = &mimetex_valign($esc_texstring);
1.97 www 405: my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62 albertel 406: if ($displaystyle) {
1.106 bisitz 407: $result='<div style="text-align:center">'.$result.'</div>';
1.62 albertel 408: }
409: return $result;
1.59 albertel 410: }
411:
412: sub converted {
1.67 albertel 413: my ($string,$mode)=@_;
1.83 albertel 414: if ($mode eq '') { $mode = &tex_engine(); }
1.68 albertel 415: if ($mode =~ /tth/i) {
1.67 albertel 416: return &tth_converted($string);
1.68 albertel 417: } elsif ($mode =~ /jsmath/i) {
1.67 albertel 418: return &jsMath_converted($string);
1.109 dseaton 419: } elsif ($mode =~ /mathjax/i) {
420: return &MathJax_converted($string);
1.68 albertel 421: } elsif ($mode =~ /mimetex/i) {
1.67 albertel 422: return &mimetex_converted($string);
1.98 www 423: } elsif ($mode =~ /raw/i) {
424: return $$string;
1.59 albertel 425: }
1.67 albertel 426: return &tth_converted($string);
1.59 albertel 427: }
428:
1.6 www 429: # ------------------------------------------------------------ Message display
430:
1.9 albertel 431: sub to_convert {
432: my ($string) = @_;
1.102 faziophi 433: &init_tth();
1.22 www 434: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 435: # $string=~s/\s/ /gs;
1.18 albertel 436: $string=&HTML::Entities::decode($string);
1.9 albertel 437: return &converted(\$string);
438: }
439:
1.20 www 440: sub smiley {
1.31 albertel 441: my $expression=shift;
1.99 faziophi 442: my %smileys=(
443: '\:\-*\)' => 'face-smile.png',
1.100 faziophi 444: '8\-\)' => 'face-cool.png',
445: '8\-(I|\|)' => 'face-glasses.png',
1.101 faziophi 446: '\:\-(I|\|)' => 'face-plain.png',
1.99 faziophi 447: '\:\-(o|O|\(\))' => 'face-surprise.png',
1.101 faziophi 448: ':\-\(' => 'face-sad.png',
449: '\;\-\)' => 'face-wink.png',
450: '\:\-(P|p)' => 'face-raspberry.png',
1.100 faziophi 451: '\:\-(\\\|\\/)' => 'face-uncertain.png',
1.101 faziophi 452: '\:\-D' => 'face-smile-big.png',
453: '\:\-(C|\@)' => 'face-angry.png',
1.99 faziophi 454: '\:(\'|\`)\-*\(' => 'face-crying.png',
1.101 faziophi 455: '\:\-(X|x|\#)' => 'face-quiet.png',
456: '\:\-(s|S)' => 'face-uncertain.png',
457: '\:\-\$' => 'face-embarrassed.png',
458: '\:\-\*' => 'face-kiss.png',
1.99 faziophi 459: '\+O\(' => 'face-sick.png',
460: '(\<\;3|\(heart\))' => 'heart.png',
461: '\(rose\)' => 'rose.png',
462: '\(pizza\)' => 'food-pizza.png',
463: '\(cake\)' => 'food-cake.png',
464: '\(ninja\)' => 'face-ninja.png',
465: '\(pirate\)' => 'face-pirate.png',
466: '\((agree|yes)\)' => 'opinion-agree.png',
467: '\((disagree|nay)\)' => 'opinion-disagree.png',
1.101 faziophi 468: '(o|O)\-\)' => 'face-angel.png',
1.99 faziophi 469: );
1.31 albertel 470: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79 albertel 471: foreach my $smiley (keys(%smileys)) {
1.99 faziophi 472: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs;
1.31 albertel 473: }
474: return $expression;
1.20 www 475: }
476:
1.6 www 477: sub msgtexconverted {
1.39 raeburn 478: my ($message,$email) = @_;
1.17 albertel 479: $errorstring='';
1.25 www 480: my $outmessage='';
481: my $tex=0;
1.79 albertel 482: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
1.25 www 483: if ($tex) {
1.30 albertel 484: if ($email) {
1.79 albertel 485: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
486: $tex=0;
1.30 albertel 487: } else {
1.79 albertel 488: $outmessage.=&to_convert($fragment);
489: $tex=0;
1.30 albertel 490: }
1.25 www 491: } else {
1.79 albertel 492: $outmessage.=&smiley($fragment);
493: $tex=1;
1.25 www 494: }
495: }
1.64 albertel 496: $message=$outmessage; $outmessage=''; $tex=0;
1.79 albertel 497: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
498: $message)) {
1.64 albertel 499: if ($tex) {
1.103 faziophi 500: my $algebra = &algebra($fragment, 'web', undef, undef, undef, undef, 'tth');
1.64 albertel 501: if ($email) {
1.103 faziophi 502: $outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
1.79 albertel 503: $tex=0;
1.64 albertel 504: } else {
1.103 faziophi 505: $outmessage.=$algebra;
1.79 albertel 506: $tex=0;
1.64 albertel 507: }
508: } else {
1.103 faziophi 509: $outmessage.=$fragment;
1.79 albertel 510: $tex=1;
1.64 albertel 511: }
512: }
1.24 albertel 513: if (wantarray) {
1.25 www 514: return ($outmessage,$errorstring);
1.24 albertel 515: } else {
1.25 www 516: return $outmessage.$errorstring;
1.24 albertel 517: }
1.1 harris41 518: }
519:
1.44 albertel 520: sub algebra {
1.49 albertel 521: use AlgParser;
1.103 faziophi 522: my ($string,$target,$style,$parstack,$safeeval,$tth)=@_;
1.44 albertel 523: my $parser = new AlgParserWithImplicitExpand;
1.103 faziophi 524: if ($tth eq 'tth') {&init_tth();}
1.46 albertel 525: $string=&prepare_algebra($string);
1.44 albertel 526: my $ret = $parser->parse($string);
527: my $result='['.&mt('Algebra unconverted due to previous errors').']';
528: if ( ref($ret) ) {
1.50 albertel 529: #$parser->tostring();
1.44 albertel 530: $parser->normalize();
531: my $latex=$parser->tolatex();
1.49 albertel 532: $latex=&postprocess_algebra($latex);
1.58 albertel 533: if ($style eq 'display') {
534: $latex='$$'.$latex.'$$x';
535: } else {
1.61 albertel 536: # style is 'inline'
1.58 albertel 537: $latex='\\ensuremath{'.$latex.'}';
538: }
1.44 albertel 539: if ($target eq 'web' || $target eq 'analyze') {
1.89 droeschl 540: my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
541: $result = &converted(\$latex,$display);
542: # $result = &converted(\$latex);
1.44 albertel 543: } else {
544: $result = $latex;
545: }
546: } else {
547: &Apache::lonxml::error($parser->{'htmlerror'});
548: }
549: }
550:
1.46 albertel 551: sub prepare_algebra {
552: my ($string)=@_;
553:
1.50 albertel 554: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 555: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 556:
1.46 albertel 557: return $string;
558: }
559:
560: sub postprocess_algebra {
561: my ($string)=@_;
1.48 albertel 562:
1.50 albertel 563: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 564: # $string =~s/\\fun/ /g;
1.47 albertel 565:
1.51 albertel 566: # sqrt(3,4) means the 4 root of 3
1.52 albertel 567: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
568:
1.53 albertel 569: # log(3,4) means the log base 4 of 3
570: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
571:
1.54 albertel 572: # log(3,4) means the log base 4 of 3
573: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
574:
1.55 albertel 575: # int(3,a,b) integral from a to b of 3
576: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
577:
578: # int( ... dx) -> ...
579: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 580:
1.56 albertel 581: #
582: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 583: return $string;
584: }
1.1 harris41 585: 1;
586: __END__
587:
588:
1.91 jms 589: =pod
590:
591: =head1 NAME
592:
593: Apache::lontexconvert;
594:
595: =head1 SYNOPSIS
596:
597: Access to tth/ttm
598:
599: This is part of the LearningOnline Network with CAPA project
600: described at http://www.lon-capa.org.
601:
602:
603: =head1 SUBROUTINES
604:
605: =over
606:
607: =item init_tth()
608:
609: Header
610:
611: =item convert_real()
612:
613: we need this routine because &converted can get called from inside
614: of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
615: allow the opcode for alarm, so we need to compile this before we get
616: into the safe space since opcode checks only occur at compile time
617:
618: =item tth_converted()
619:
620:
621: =item clean_out_math_mode()
622:
623:
624: =item displaystyle()
625:
626:
627: =item jsMath_converted()
628:
1.109 dseaton 629: =item MathJax_converted()
630: - Mimics the jsMath functionality
1.91 jms 631:
632: =item tex_engine()
633:
634:
635: =item init_math_support()
636:
1.105 raeburn 637: =item mimetex_valign()
638:
639: Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the
640: vertical alignment, before the subsequent call to mimetex_converted()
641: which generates the <img> tag and the corresponding image.
642:
643: Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex).
644: Output: 1. $valign - number of pixels: positive or negative integer
645: which will be included in <img> tag for mimetex image to
646: support vertical alignment of image within a line of text.
647:
648: If a server is running SSL, and Apache rewrite rules are in place
649: to rewrite requests for http to https, modification will most likely
650: be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.
651:
652: Example rewrite rules which rewrite all http traffic to https,
653: except HEAD requests for /cgi-bin/mimetex.cgi are:
654:
655: <IfModule mod_rewrite.c>
656: RewriteEngine On
657: RewriteLogLevel 0
658:
659: RewriteCond %{HTTPS} off
660: RewriteCond %{HTTP:Host} (.*)
661: RewriteCond %{REQUEST_METHOD} !HEAD
662: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
663:
664: RewriteCond %{HTTPS} off
665: RewriteCond %{HTTP:Host} (.*)
666: RewriteCond %{REQUEST_METHOD} HEAD
667: RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi
668: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
669: </IfModule>
1.91 jms 670:
671: =item mimetex_converted()
672:
673:
674: =item converted()
675:
676:
677: =item to_convert()
678:
679: message display
680:
681: =item smiley()
682:
683: ???
684:
685: =item msgtexconverted()
686:
687: =item algebra()
688:
689: =item prepare_algebra()
690:
691: =item postprocess_algebra()
1.1 harris41 692:
1.91 jms 693: =back
1.1 harris41 694:
1.91 jms 695: =cut
1.1 harris41 696:
697:
698:
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