Annotation of loncom/xml/lontexconvert.pm, revision 1.110
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.110 ! foxr 4: # $Id: lontexconvert.pm,v 1.109 2011/12/06 16:10:53 dseaton 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($errorstring);
1.73 albertel 45: #use Apache::lonxml();
1.33 albertel 46: use Apache::lonlocal;
1.65 albertel 47: use Apache::lonnet;
1.75 www 48: use lib '/home/httpd/lib/perl/';
49: use LONCAPA;
1.94 raeburn 50: use URI::Escape;
51: use IO::Socket::INET;
1.1 harris41 52:
1.110 ! foxr 53:
! 54: #
! 55: # Table of substitutions to unicode characters.
! 56: #
! 57: my %unicode_translations = (
! 58: '\rightleftharpoons' => 0x21cc,
! 59: '' => 0x23a1,
! 60: '' => 0x23a2,
! 61: '' => 0x23a3,
! 62: '' => 0x23a4,
! 63: '' => 0x23a5,
! 64: '' => 0x23a6
! 65: );
! 66:
! 67: ##
! 68: # Utility to convert elements of a string to unicode:
! 69: #
! 70: # @param input - Input string
! 71: # @param pattern - Pattern to convert
! 72: # @param unicode - Unicode to substitute for pattern.
! 73: #
! 74: # @return string - resulting string.
! 75: #
! 76: sub unicode_subst {
! 77: my ($input, $pattern, $unicode) = @_;
! 78:
! 79: my $char = pack('U', $unicode);
! 80:
! 81: $input =~ s/$pattern/$char/g;
! 82:
! 83: return $input;
! 84: }
! 85:
1.1 harris41 86: # ====================================================================== Header
87:
1.29 albertel 88: sub init_tth {
1.65 albertel 89: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
1.74 albertel 90: if ($options =~ /\S/) {
91: $options = ' '.$options;
92: } else {
93: undef($options);
94: }
1.65 albertel 95: if ($env{'browser.mathml'}) {
1.29 albertel 96: &tth::ttminit();
1.65 albertel 97: if ($env{'browser.unicode'}) {
1.74 albertel 98: &tth::ttmoptions('-L -u1'.$options);
1.29 albertel 99: } else {
1.74 albertel 100: &tth::ttmoptions('-L -u0'.$options);
1.29 albertel 101: }
102: } else {
103: &tth::tthinit();
1.65 albertel 104: if ($env{'browser.unicode'}) {
1.74 albertel 105: &tth::tthoptions('-L -u1'.$options);
1.29 albertel 106: } else {
1.74 albertel 107: &tth::tthoptions('-L -u0'.$options);
1.29 albertel 108: }
109: }
110: }
111:
1.1 harris41 112: # ================================================================== Conversion
113:
1.19 albertel 114: $Apache::lontexconvert::messedup=0;
1.36 albertel 115:
1.91 jms 116:
1.36 albertel 117: sub convert_real {
118: my ($texstring)=@_;
119: my ($xmlstring,$errorstring);
120: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
121: local $SIG{ALRM}=sub {
1.37 albertel 122: &Apache::lonnet::logthis("ALRM");
1.36 albertel 123: $xmlstring='['.&mt("TeX unconverted due to errors").']';
124: $Apache::lontexconvert::messedup=1;
125: die &mt("TeX unconverted due to errors");
126: };
1.63 albertel 127: &Apache::lonxml::start_alarm();
1.65 albertel 128: if ($env{'browser.mathml'}) {
1.110 ! foxr 129: &Apache::lonnet::logthis("mathml");
1.36 albertel 130: $xmlstring=&tth::ttm($$texstring);
131: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
132: $xmlstring=~s/\<br\>/\<br\/\>/g;
133: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
134: $errorstring.=&tth::ttmerror();
135: } else {
1.110 ! foxr 136: &Apache::lonnet::logthis("tth");
1.36 albertel 137: $xmlstring=&tth::tth($$texstring);
138: $errorstring.=&tth::ttherror();
139: $xmlstring=~s-</font(\s*)>-</font>-g;
140: }
1.43 www 141: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 142: $xmlstring=~s/^\s*//;
143: $xmlstring=~s/\s*$//;
1.110 ! foxr 144: &Apache::lonxml::end_alarm();
! 145:
1.85 foxr 146: #
1.110 ! foxr 147: # Several strings produced by tth require
! 148: # transliteration -> unicode equivalents to render reliably
! 149: # in browsers. %unicode_translations is a table of
! 150: # string->substitution which we now apply:
! 151:
! 152: foreach my $pattern (keys(%unicode_translations)) {
! 153: my $unicode = $unicode_translations{$pattern};
! 154: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode);
! 155: }
! 156:
1.85 foxr 157:
1.36 albertel 158: return ($xmlstring,$errorstring);
159: }
160:
1.59 albertel 161: sub tth_converted {
1.31 albertel 162: my $texstring=shift;
1.34 www 163: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 164: if ($Apache::lontexconvert::messedup) {
1.35 albertel 165: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 166: }
1.59 albertel 167: $$texstring ='\\documentstyle{article}'.$$texstring;
168:
1.31 albertel 169: eval(<<'ENDCONV');
1.36 albertel 170: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 171: ENDCONV
1.32 albertel 172: if ($@) {
1.35 albertel 173: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 174: $Apache::lontexconvert::messedup=1;
175: }
1.37 albertel 176: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
177: $errorstring) {
1.31 albertel 178: &Apache::lonnet::logthis("Trying to kill myself");
179: $Apache::lontexconvert::messedup=1;
1.70 albertel 180: if (ref($Apache::lonxml::request)) {
181: $Apache::lonxml::request->child_terminate();
182: } else {
183: my $request;
184: eval { $request=Apache->request; };
185: if (!$request) {
186: eval { $request=Apache2::RequestUtil->request; };
187: }
188: if ($request) {
189: $request->child_terminate();
190: } else {
191: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
192: }
193: }
1.31 albertel 194: }
195: return $xmlstring;
1.1 harris41 196: }
197:
1.62 albertel 198: sub clean_out_math_mode {
199: my ($texstring)=@_;
1.82 albertel 200: $$texstring=~s/(?<!\\)\$//g;
1.62 albertel 201: $$texstring=~s/\\[\)\(\]\[]//g;
202: $$texstring=~s/\\ensuremath//g;
203: return '';
204: }
205:
206: sub displaystyle {
207: my ($texstring)=@_;
1.106 bisitz 208: #has a $$ or \[ or \displaystyle or eqnarray in it, guessinng it's display mode
1.62 albertel 209: if ($$texstring=~/[^\\]\$\$/ ||
1.106 bisitz 210: $$texstring=~/\\\[/ ||
211: $$texstring=~/\\displaystyle/ ||
212: $$texstring=~/eqnarray/
213: ) { return 1; }
1.62 albertel 214: return 0;
215: }
216:
1.109 dseaton 217: sub MathJax_converted {
218: my $texstring=shift;
219: my $tag='math/tex;';
220: if (&displaystyle($texstring)) { $tag='math/tex; mode=display'; }
221: &clean_out_math_mode($texstring);
222: return &MathJax_header().
223: '<script type="'.$tag.'">'.$$texstring.'</script>';
224: }
225:
226: {
227: #Relies heavily on the previous jsMath installation
228: my @MathJax_sent_header;
229: sub MathJax_reset {
230: undef(@MathJax_sent_header);
231: }
232: sub MathJax_push {
233: push(@MathJax_sent_header,0);
234: }
235: sub MathJax_header {
236: if (!@MathJax_sent_header) {
237: &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
238: return '';
239: }
240: return '' if $MathJax_sent_header[-1];
241: $MathJax_sent_header[-1]=1;
242: return
243: '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
244: }
245: #sub MathJax_process {
246: # my $state = pop(@MathJax_sent_header);
247: # return '' if !$state;
248: # return "\n".
249: # '<script type="text/javascript">MathJax.Process()</script>'."\n";
250: #}
251: #sub MathJax_state {
252: # my ($level) = @_;
253: # return $MathJax_sent_header[$level];
254: #}
255: }
256:
257:
1.59 albertel 258: sub jsMath_converted {
259: my $texstring=shift;
260: my $tag='span';
1.62 albertel 261: if (&displaystyle($texstring)) { $tag='div'; }
262: &clean_out_math_mode($texstring);
1.67 albertel 263: return &jsMath_header().
264: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
265: }
266:
267: {
1.76 albertel 268: my @jsMath_sent_header;
1.67 albertel 269: sub jsMath_reset {
1.76 albertel 270: undef(@jsMath_sent_header);
271: }
272: sub jsMath_push {
273: push(@jsMath_sent_header,0);
1.67 albertel 274: }
275: sub jsMath_header {
1.80 albertel 276: if (!@jsMath_sent_header) {
277: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
278: return '';
279: }
1.76 albertel 280: return '' if $jsMath_sent_header[-1];
281: $jsMath_sent_header[-1]=1;
1.67 albertel 282: return
283: '<script type="text/javascript">
284: function NoFontMessage () {}
1.78 albertel 285: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67 albertel 286: </script>'."\n".
1.71 albertel 287: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67 albertel 288: }
289: sub jsMath_process {
1.76 albertel 290: my $state = pop(@jsMath_sent_header);
291: return '' if !$state;
1.81 albertel 292: return "\n".
293: '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67 albertel 294: }
1.84 albertel 295: sub jsMath_state {
296: my ($level) = @_;
297: return $jsMath_sent_header[$level];
298: }
1.62 albertel 299: }
300:
1.83 albertel 301: sub tex_engine {
302: if (exists($env{'form.texengine'})) {
1.88 raeburn 303: if ($env{'form.texengine'} ne '') {
304: return $env{'form.texengine'};
305: }
1.83 albertel 306: }
307: if ($env{'request.course.id'}
308: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
309: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
310: }
311: if (exists($env{'environment.texengine'})) {
312: return $env{'environment.texengine'};
313: }
314: return 'tth';
315: }
316:
1.72 albertel 317: sub init_math_support {
1.84 albertel 318: my ($inherit_jsmath) = @_;
1.73 albertel 319: &init_tth();
1.76 albertel 320: &Apache::lontexconvert::jsMath_push();
1.84 albertel 321: if (lc(&tex_engine()) eq 'jsmath' ||
322: ($inherit_jsmath && &jsMath_state(-2))) {
1.72 albertel 323: return &Apache::lontexconvert::jsMath_header();
324: }
1.109 dseaton 325: &Apache::lontexconvert::MathJax_push();
326: if (lc(&tex_engine()) eq 'mathjax') { # ||
327: #($inherit_jsmath && &jsMath_state(-2))) {
328: return &Apache::lontexconvert::MathJax_header();
329: }
1.72 albertel 330: return;
331: }
332:
1.92 hauer 333: sub mimetex_valign {
1.94 raeburn 334: my ($esc_texstring)=@_;
335: my $valign = 0;
336: my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
337: my $socket;
338: &Apache::lonxml::start_alarm();
1.108 raeburn 339: $socket = IO::Socket::INET->new(PeerAddr => 'localhost',
1.107 raeburn 340: PeerPort => 'http(80)',
341: Proto => 'tcp');
1.94 raeburn 342: if ($socket) {
1.96 raeburn 343: my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94 raeburn 344: print $socket $headreq;
345: while (<$socket>) {
346: if (/Vertical\-Align\:\s*?([\-\d]+)/) {
347: $valign = $1;
348: }
349: }
1.105 raeburn 350: $socket->close();
1.92 hauer 351: }
1.94 raeburn 352: &Apache::lonxml::end_alarm();
353: return $valign;
1.92 hauer 354: }
355:
1.62 albertel 356: sub mimetex_converted {
357: my $texstring=shift;
1.97 www 358:
359: # Alt-Argument for screen readers
360: my $alt_string=$$texstring;
361: $alt_string=~s/\"/\'\'/g;
362:
363: # Is this displaystyle?
364:
1.62 albertel 365: my $displaystyle=&displaystyle($texstring);
366:
1.97 www 367: # Remove math environment delimiters
368:
1.62 albertel 369: &clean_out_math_mode($texstring);
370:
371: if ($displaystyle) {
372: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 373: }
1.94 raeburn 374: my $esc_texstring = &uri_escape($$texstring);
375: my $valign = &mimetex_valign($esc_texstring);
1.97 www 376: my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62 albertel 377: if ($displaystyle) {
1.106 bisitz 378: $result='<div style="text-align:center">'.$result.'</div>';
1.62 albertel 379: }
380: return $result;
1.59 albertel 381: }
382:
383: sub converted {
1.67 albertel 384: my ($string,$mode)=@_;
1.83 albertel 385: if ($mode eq '') { $mode = &tex_engine(); }
1.68 albertel 386: if ($mode =~ /tth/i) {
1.67 albertel 387: return &tth_converted($string);
1.68 albertel 388: } elsif ($mode =~ /jsmath/i) {
1.67 albertel 389: return &jsMath_converted($string);
1.109 dseaton 390: } elsif ($mode =~ /mathjax/i) {
391: return &MathJax_converted($string);
1.68 albertel 392: } elsif ($mode =~ /mimetex/i) {
1.67 albertel 393: return &mimetex_converted($string);
1.98 www 394: } elsif ($mode =~ /raw/i) {
395: return $$string;
1.59 albertel 396: }
1.67 albertel 397: return &tth_converted($string);
1.59 albertel 398: }
399:
1.6 www 400: # ------------------------------------------------------------ Message display
401:
1.9 albertel 402: sub to_convert {
403: my ($string) = @_;
1.102 faziophi 404: &init_tth();
1.22 www 405: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 406: # $string=~s/\s/ /gs;
1.18 albertel 407: $string=&HTML::Entities::decode($string);
1.9 albertel 408: return &converted(\$string);
409: }
410:
1.20 www 411: sub smiley {
1.31 albertel 412: my $expression=shift;
1.99 faziophi 413: my %smileys=(
414: '\:\-*\)' => 'face-smile.png',
1.100 faziophi 415: '8\-\)' => 'face-cool.png',
416: '8\-(I|\|)' => 'face-glasses.png',
1.101 faziophi 417: '\:\-(I|\|)' => 'face-plain.png',
1.99 faziophi 418: '\:\-(o|O|\(\))' => 'face-surprise.png',
1.101 faziophi 419: ':\-\(' => 'face-sad.png',
420: '\;\-\)' => 'face-wink.png',
421: '\:\-(P|p)' => 'face-raspberry.png',
1.100 faziophi 422: '\:\-(\\\|\\/)' => 'face-uncertain.png',
1.101 faziophi 423: '\:\-D' => 'face-smile-big.png',
424: '\:\-(C|\@)' => 'face-angry.png',
1.99 faziophi 425: '\:(\'|\`)\-*\(' => 'face-crying.png',
1.101 faziophi 426: '\:\-(X|x|\#)' => 'face-quiet.png',
427: '\:\-(s|S)' => 'face-uncertain.png',
428: '\:\-\$' => 'face-embarrassed.png',
429: '\:\-\*' => 'face-kiss.png',
1.99 faziophi 430: '\+O\(' => 'face-sick.png',
431: '(\<\;3|\(heart\))' => 'heart.png',
432: '\(rose\)' => 'rose.png',
433: '\(pizza\)' => 'food-pizza.png',
434: '\(cake\)' => 'food-cake.png',
435: '\(ninja\)' => 'face-ninja.png',
436: '\(pirate\)' => 'face-pirate.png',
437: '\((agree|yes)\)' => 'opinion-agree.png',
438: '\((disagree|nay)\)' => 'opinion-disagree.png',
1.101 faziophi 439: '(o|O)\-\)' => 'face-angel.png',
1.99 faziophi 440: );
1.31 albertel 441: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79 albertel 442: foreach my $smiley (keys(%smileys)) {
1.99 faziophi 443: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs;
1.31 albertel 444: }
445: return $expression;
1.20 www 446: }
447:
1.6 www 448: sub msgtexconverted {
1.39 raeburn 449: my ($message,$email) = @_;
1.17 albertel 450: $errorstring='';
1.25 www 451: my $outmessage='';
452: my $tex=0;
1.79 albertel 453: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
1.25 www 454: if ($tex) {
1.30 albertel 455: if ($email) {
1.79 albertel 456: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
457: $tex=0;
1.30 albertel 458: } else {
1.79 albertel 459: $outmessage.=&to_convert($fragment);
460: $tex=0;
1.30 albertel 461: }
1.25 www 462: } else {
1.79 albertel 463: $outmessage.=&smiley($fragment);
464: $tex=1;
1.25 www 465: }
466: }
1.64 albertel 467: $message=$outmessage; $outmessage=''; $tex=0;
1.79 albertel 468: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
469: $message)) {
1.64 albertel 470: if ($tex) {
1.103 faziophi 471: my $algebra = &algebra($fragment, 'web', undef, undef, undef, undef, 'tth');
1.64 albertel 472: if ($email) {
1.103 faziophi 473: $outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
1.79 albertel 474: $tex=0;
1.64 albertel 475: } else {
1.103 faziophi 476: $outmessage.=$algebra;
1.79 albertel 477: $tex=0;
1.64 albertel 478: }
479: } else {
1.103 faziophi 480: $outmessage.=$fragment;
1.79 albertel 481: $tex=1;
1.64 albertel 482: }
483: }
1.24 albertel 484: if (wantarray) {
1.25 www 485: return ($outmessage,$errorstring);
1.24 albertel 486: } else {
1.25 www 487: return $outmessage.$errorstring;
1.24 albertel 488: }
1.1 harris41 489: }
490:
1.44 albertel 491: sub algebra {
1.49 albertel 492: use AlgParser;
1.103 faziophi 493: my ($string,$target,$style,$parstack,$safeeval,$tth)=@_;
1.44 albertel 494: my $parser = new AlgParserWithImplicitExpand;
1.103 faziophi 495: if ($tth eq 'tth') {&init_tth();}
1.46 albertel 496: $string=&prepare_algebra($string);
1.44 albertel 497: my $ret = $parser->parse($string);
498: my $result='['.&mt('Algebra unconverted due to previous errors').']';
499: if ( ref($ret) ) {
1.50 albertel 500: #$parser->tostring();
1.44 albertel 501: $parser->normalize();
502: my $latex=$parser->tolatex();
1.49 albertel 503: $latex=&postprocess_algebra($latex);
1.58 albertel 504: if ($style eq 'display') {
505: $latex='$$'.$latex.'$$x';
506: } else {
1.61 albertel 507: # style is 'inline'
1.58 albertel 508: $latex='\\ensuremath{'.$latex.'}';
509: }
1.44 albertel 510: if ($target eq 'web' || $target eq 'analyze') {
1.89 droeschl 511: my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
512: $result = &converted(\$latex,$display);
513: # $result = &converted(\$latex);
1.44 albertel 514: } else {
515: $result = $latex;
516: }
517: } else {
518: &Apache::lonxml::error($parser->{'htmlerror'});
519: }
520: }
521:
1.46 albertel 522: sub prepare_algebra {
523: my ($string)=@_;
524:
1.50 albertel 525: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 526: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 527:
1.46 albertel 528: return $string;
529: }
530:
531: sub postprocess_algebra {
532: my ($string)=@_;
1.48 albertel 533:
1.50 albertel 534: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 535: # $string =~s/\\fun/ /g;
1.47 albertel 536:
1.51 albertel 537: # sqrt(3,4) means the 4 root of 3
1.52 albertel 538: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
539:
1.53 albertel 540: # log(3,4) means the log base 4 of 3
541: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
542:
1.54 albertel 543: # log(3,4) means the log base 4 of 3
544: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
545:
1.55 albertel 546: # int(3,a,b) integral from a to b of 3
547: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
548:
549: # int( ... dx) -> ...
550: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 551:
1.56 albertel 552: #
553: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 554: return $string;
555: }
1.1 harris41 556: 1;
557: __END__
558:
559:
1.91 jms 560: =pod
561:
562: =head1 NAME
563:
564: Apache::lontexconvert;
565:
566: =head1 SYNOPSIS
567:
568: Access to tth/ttm
569:
570: This is part of the LearningOnline Network with CAPA project
571: described at http://www.lon-capa.org.
572:
573:
574: =head1 SUBROUTINES
575:
576: =over
577:
578: =item init_tth()
579:
580: Header
581:
582: =item convert_real()
583:
584: we need this routine because &converted can get called from inside
585: of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
586: allow the opcode for alarm, so we need to compile this before we get
587: into the safe space since opcode checks only occur at compile time
588:
589: =item tth_converted()
590:
591:
592: =item clean_out_math_mode()
593:
594:
595: =item displaystyle()
596:
597:
598: =item jsMath_converted()
599:
1.109 dseaton 600: =item MathJax_converted()
601: - Mimics the jsMath functionality
1.91 jms 602:
603: =item tex_engine()
604:
605:
606: =item init_math_support()
607:
1.105 raeburn 608: =item mimetex_valign()
609:
610: Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the
611: vertical alignment, before the subsequent call to mimetex_converted()
612: which generates the <img> tag and the corresponding image.
613:
614: Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex).
615: Output: 1. $valign - number of pixels: positive or negative integer
616: which will be included in <img> tag for mimetex image to
617: support vertical alignment of image within a line of text.
618:
619: If a server is running SSL, and Apache rewrite rules are in place
620: to rewrite requests for http to https, modification will most likely
621: be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.
622:
623: Example rewrite rules which rewrite all http traffic to https,
624: except HEAD requests for /cgi-bin/mimetex.cgi are:
625:
626: <IfModule mod_rewrite.c>
627: RewriteEngine On
628: RewriteLogLevel 0
629:
630: RewriteCond %{HTTPS} off
631: RewriteCond %{HTTP:Host} (.*)
632: RewriteCond %{REQUEST_METHOD} !HEAD
633: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
634:
635: RewriteCond %{HTTPS} off
636: RewriteCond %{HTTP:Host} (.*)
637: RewriteCond %{REQUEST_METHOD} HEAD
638: RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi
639: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
640: </IfModule>
1.91 jms 641:
642: =item mimetex_converted()
643:
644:
645: =item converted()
646:
647:
648: =item to_convert()
649:
650: message display
651:
652: =item smiley()
653:
654: ???
655:
656: =item msgtexconverted()
657:
658: =item algebra()
659:
660: =item prepare_algebra()
661:
662: =item postprocess_algebra()
1.1 harris41 663:
1.91 jms 664: =back
1.1 harris41 665:
1.91 jms 666: =cut
1.1 harris41 667:
668:
669:
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