Annotation of loncom/xml/lontexconvert.pm, revision 1.113
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.113 ! raeburn 4: # $Id: lontexconvert.pm,v 1.112 2012/03/11 14:46:46 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'}) {
1.36 albertel 158: $xmlstring=&tth::ttm($$texstring);
159: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
160: $xmlstring=~s/\<br\>/\<br\/\>/g;
161: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
162: $errorstring.=&tth::ttmerror();
163: } else {
164: $xmlstring=&tth::tth($$texstring);
165: $errorstring.=&tth::ttherror();
166: $xmlstring=~s-</font(\s*)>-</font>-g;
167: }
1.43 www 168: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 169: $xmlstring=~s/^\s*//;
170: $xmlstring=~s/\s*$//;
1.110 foxr 171: &Apache::lonxml::end_alarm();
172:
1.85 foxr 173: #
1.110 foxr 174: # Several strings produced by tth require
175: # transliteration -> unicode equivalents to render reliably
176: # in browsers. %unicode_translations is a table of
177: # string->substitution which we now apply:
178:
179: foreach my $pattern (keys(%unicode_translations)) {
180: my $unicode = $unicode_translations{$pattern};
181: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode);
182: }
183:
1.85 foxr 184:
1.36 albertel 185: return ($xmlstring,$errorstring);
186: }
187:
1.59 albertel 188: sub tth_converted {
1.31 albertel 189: my $texstring=shift;
1.34 www 190: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 191: if ($Apache::lontexconvert::messedup) {
1.35 albertel 192: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 193: }
1.59 albertel 194: $$texstring ='\\documentstyle{article}'.$$texstring;
195:
1.31 albertel 196: eval(<<'ENDCONV');
1.36 albertel 197: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 198: ENDCONV
1.32 albertel 199: if ($@) {
1.35 albertel 200: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 201: $Apache::lontexconvert::messedup=1;
202: }
1.37 albertel 203: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
204: $errorstring) {
1.31 albertel 205: &Apache::lonnet::logthis("Trying to kill myself");
206: $Apache::lontexconvert::messedup=1;
1.70 albertel 207: if (ref($Apache::lonxml::request)) {
208: $Apache::lonxml::request->child_terminate();
209: } else {
210: my $request;
211: eval { $request=Apache->request; };
212: if (!$request) {
213: eval { $request=Apache2::RequestUtil->request; };
214: }
215: if ($request) {
216: $request->child_terminate();
217: } else {
218: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
219: }
220: }
1.31 albertel 221: }
222: return $xmlstring;
1.1 harris41 223: }
224:
1.62 albertel 225: sub clean_out_math_mode {
226: my ($texstring)=@_;
1.82 albertel 227: $$texstring=~s/(?<!\\)\$//g;
1.62 albertel 228: $$texstring=~s/\\[\)\(\]\[]//g;
229: $$texstring=~s/\\ensuremath//g;
230: return '';
231: }
232:
233: sub displaystyle {
234: my ($texstring)=@_;
1.106 bisitz 235: #has a $$ or \[ or \displaystyle or eqnarray in it, guessinng it's display mode
1.62 albertel 236: if ($$texstring=~/[^\\]\$\$/ ||
1.106 bisitz 237: $$texstring=~/\\\[/ ||
238: $$texstring=~/\\displaystyle/ ||
239: $$texstring=~/eqnarray/
240: ) { return 1; }
1.62 albertel 241: return 0;
242: }
243:
1.109 dseaton 244: sub MathJax_converted {
245: my $texstring=shift;
246: my $tag='math/tex;';
247: if (&displaystyle($texstring)) { $tag='math/tex; mode=display'; }
248: &clean_out_math_mode($texstring);
249: return &MathJax_header().
250: '<script type="'.$tag.'">'.$$texstring.'</script>';
251: }
252:
253: {
254: #Relies heavily on the previous jsMath installation
255: my @MathJax_sent_header;
256: sub MathJax_reset {
257: undef(@MathJax_sent_header);
258: }
259: sub MathJax_push {
260: push(@MathJax_sent_header,0);
261: }
262: sub MathJax_header {
263: if (!@MathJax_sent_header) {
264: &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
265: return '';
266: }
267: return '' if $MathJax_sent_header[-1];
268: $MathJax_sent_header[-1]=1;
269: return
270: '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
271: }
272: #sub MathJax_process {
273: # my $state = pop(@MathJax_sent_header);
274: # return '' if !$state;
275: # return "\n".
276: # '<script type="text/javascript">MathJax.Process()</script>'."\n";
277: #}
278: #sub MathJax_state {
279: # my ($level) = @_;
280: # return $MathJax_sent_header[$level];
281: #}
282: }
283:
284:
1.59 albertel 285: sub jsMath_converted {
286: my $texstring=shift;
287: my $tag='span';
1.62 albertel 288: if (&displaystyle($texstring)) { $tag='div'; }
289: &clean_out_math_mode($texstring);
1.67 albertel 290: return &jsMath_header().
291: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
292: }
293:
294: {
1.76 albertel 295: my @jsMath_sent_header;
1.67 albertel 296: sub jsMath_reset {
1.76 albertel 297: undef(@jsMath_sent_header);
298: }
299: sub jsMath_push {
300: push(@jsMath_sent_header,0);
1.67 albertel 301: }
302: sub jsMath_header {
1.80 albertel 303: if (!@jsMath_sent_header) {
304: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
305: return '';
306: }
1.76 albertel 307: return '' if $jsMath_sent_header[-1];
308: $jsMath_sent_header[-1]=1;
1.67 albertel 309: return
310: '<script type="text/javascript">
311: function NoFontMessage () {}
1.78 albertel 312: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67 albertel 313: </script>'."\n".
1.71 albertel 314: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67 albertel 315: }
316: sub jsMath_process {
1.76 albertel 317: my $state = pop(@jsMath_sent_header);
318: return '' if !$state;
1.81 albertel 319: return "\n".
320: '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67 albertel 321: }
1.84 albertel 322: sub jsMath_state {
323: my ($level) = @_;
324: return $jsMath_sent_header[$level];
325: }
1.62 albertel 326: }
327:
1.83 albertel 328: sub tex_engine {
329: if (exists($env{'form.texengine'})) {
1.88 raeburn 330: if ($env{'form.texengine'} ne '') {
331: return $env{'form.texengine'};
332: }
1.83 albertel 333: }
334: if ($env{'request.course.id'}
335: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
336: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
337: }
338: if (exists($env{'environment.texengine'})) {
339: return $env{'environment.texengine'};
340: }
341: return 'tth';
342: }
343:
1.72 albertel 344: sub init_math_support {
1.84 albertel 345: my ($inherit_jsmath) = @_;
1.73 albertel 346: &init_tth();
1.76 albertel 347: &Apache::lontexconvert::jsMath_push();
1.84 albertel 348: if (lc(&tex_engine()) eq 'jsmath' ||
349: ($inherit_jsmath && &jsMath_state(-2))) {
1.72 albertel 350: return &Apache::lontexconvert::jsMath_header();
351: }
1.109 dseaton 352: &Apache::lontexconvert::MathJax_push();
353: if (lc(&tex_engine()) eq 'mathjax') { # ||
354: #($inherit_jsmath && &jsMath_state(-2))) {
355: return &Apache::lontexconvert::MathJax_header();
356: }
1.72 albertel 357: return;
358: }
359:
1.92 hauer 360: sub mimetex_valign {
1.94 raeburn 361: my ($esc_texstring)=@_;
362: my $valign = 0;
363: my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
364: my $socket;
365: &Apache::lonxml::start_alarm();
1.108 raeburn 366: $socket = IO::Socket::INET->new(PeerAddr => 'localhost',
1.107 raeburn 367: PeerPort => 'http(80)',
368: Proto => 'tcp');
1.94 raeburn 369: if ($socket) {
1.96 raeburn 370: my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94 raeburn 371: print $socket $headreq;
372: while (<$socket>) {
373: if (/Vertical\-Align\:\s*?([\-\d]+)/) {
374: $valign = $1;
375: }
376: }
1.105 raeburn 377: $socket->close();
1.92 hauer 378: }
1.94 raeburn 379: &Apache::lonxml::end_alarm();
380: return $valign;
1.92 hauer 381: }
382:
1.62 albertel 383: sub mimetex_converted {
384: my $texstring=shift;
1.97 www 385:
386: # Alt-Argument for screen readers
387: my $alt_string=$$texstring;
388: $alt_string=~s/\"/\'\'/g;
389:
390: # Is this displaystyle?
391:
1.62 albertel 392: my $displaystyle=&displaystyle($texstring);
393:
1.97 www 394: # Remove math environment delimiters
395:
1.62 albertel 396: &clean_out_math_mode($texstring);
397:
398: if ($displaystyle) {
399: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 400: }
1.94 raeburn 401: my $esc_texstring = &uri_escape($$texstring);
402: my $valign = &mimetex_valign($esc_texstring);
1.97 www 403: my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62 albertel 404: if ($displaystyle) {
1.106 bisitz 405: $result='<div style="text-align:center">'.$result.'</div>';
1.62 albertel 406: }
407: return $result;
1.59 albertel 408: }
409:
410: sub converted {
1.67 albertel 411: my ($string,$mode)=@_;
1.83 albertel 412: if ($mode eq '') { $mode = &tex_engine(); }
1.68 albertel 413: if ($mode =~ /tth/i) {
1.67 albertel 414: return &tth_converted($string);
1.68 albertel 415: } elsif ($mode =~ /jsmath/i) {
1.67 albertel 416: return &jsMath_converted($string);
1.109 dseaton 417: } elsif ($mode =~ /mathjax/i) {
418: return &MathJax_converted($string);
1.68 albertel 419: } elsif ($mode =~ /mimetex/i) {
1.67 albertel 420: return &mimetex_converted($string);
1.98 www 421: } elsif ($mode =~ /raw/i) {
422: return $$string;
1.59 albertel 423: }
1.67 albertel 424: return &tth_converted($string);
1.59 albertel 425: }
426:
1.6 www 427: # ------------------------------------------------------------ Message display
428:
1.9 albertel 429: sub to_convert {
430: my ($string) = @_;
1.102 faziophi 431: &init_tth();
1.22 www 432: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 433: # $string=~s/\s/ /gs;
1.18 albertel 434: $string=&HTML::Entities::decode($string);
1.9 albertel 435: return &converted(\$string);
436: }
437:
1.20 www 438: sub smiley {
1.31 albertel 439: my $expression=shift;
1.99 faziophi 440: my %smileys=(
441: '\:\-*\)' => 'face-smile.png',
1.100 faziophi 442: '8\-\)' => 'face-cool.png',
443: '8\-(I|\|)' => 'face-glasses.png',
1.101 faziophi 444: '\:\-(I|\|)' => 'face-plain.png',
1.99 faziophi 445: '\:\-(o|O|\(\))' => 'face-surprise.png',
1.101 faziophi 446: ':\-\(' => 'face-sad.png',
447: '\;\-\)' => 'face-wink.png',
448: '\:\-(P|p)' => 'face-raspberry.png',
1.100 faziophi 449: '\:\-(\\\|\\/)' => 'face-uncertain.png',
1.101 faziophi 450: '\:\-D' => 'face-smile-big.png',
451: '\:\-(C|\@)' => 'face-angry.png',
1.99 faziophi 452: '\:(\'|\`)\-*\(' => 'face-crying.png',
1.101 faziophi 453: '\:\-(X|x|\#)' => 'face-quiet.png',
454: '\:\-(s|S)' => 'face-uncertain.png',
455: '\:\-\$' => 'face-embarrassed.png',
456: '\:\-\*' => 'face-kiss.png',
1.99 faziophi 457: '\+O\(' => 'face-sick.png',
458: '(\<\;3|\(heart\))' => 'heart.png',
459: '\(rose\)' => 'rose.png',
460: '\(pizza\)' => 'food-pizza.png',
461: '\(cake\)' => 'food-cake.png',
462: '\(ninja\)' => 'face-ninja.png',
463: '\(pirate\)' => 'face-pirate.png',
464: '\((agree|yes)\)' => 'opinion-agree.png',
465: '\((disagree|nay)\)' => 'opinion-disagree.png',
1.101 faziophi 466: '(o|O)\-\)' => 'face-angel.png',
1.99 faziophi 467: );
1.31 albertel 468: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79 albertel 469: foreach my $smiley (keys(%smileys)) {
1.99 faziophi 470: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs;
1.31 albertel 471: }
472: return $expression;
1.20 www 473: }
474:
1.6 www 475: sub msgtexconverted {
1.39 raeburn 476: my ($message,$email) = @_;
1.17 albertel 477: $errorstring='';
1.25 www 478: my $outmessage='';
479: my $tex=0;
1.79 albertel 480: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
1.25 www 481: if ($tex) {
1.30 albertel 482: if ($email) {
1.79 albertel 483: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
484: $tex=0;
1.30 albertel 485: } else {
1.79 albertel 486: $outmessage.=&to_convert($fragment);
487: $tex=0;
1.30 albertel 488: }
1.25 www 489: } else {
1.79 albertel 490: $outmessage.=&smiley($fragment);
491: $tex=1;
1.25 www 492: }
493: }
1.64 albertel 494: $message=$outmessage; $outmessage=''; $tex=0;
1.79 albertel 495: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
496: $message)) {
1.64 albertel 497: if ($tex) {
1.113 ! raeburn 498: my $algebra = &algebra($fragment, 'web', undef, undef, undef, 'tth');
1.64 albertel 499: if ($email) {
1.103 faziophi 500: $outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
1.79 albertel 501: $tex=0;
1.64 albertel 502: } else {
1.103 faziophi 503: $outmessage.=$algebra;
1.79 albertel 504: $tex=0;
1.64 albertel 505: }
506: } else {
1.103 faziophi 507: $outmessage.=$fragment;
1.79 albertel 508: $tex=1;
1.64 albertel 509: }
510: }
1.24 albertel 511: if (wantarray) {
1.25 www 512: return ($outmessage,$errorstring);
1.24 albertel 513: } else {
1.25 www 514: return $outmessage.$errorstring;
1.24 albertel 515: }
1.1 harris41 516: }
517:
1.44 albertel 518: sub algebra {
1.49 albertel 519: use AlgParser;
1.103 faziophi 520: my ($string,$target,$style,$parstack,$safeeval,$tth)=@_;
1.44 albertel 521: my $parser = new AlgParserWithImplicitExpand;
1.103 faziophi 522: if ($tth eq 'tth') {&init_tth();}
1.46 albertel 523: $string=&prepare_algebra($string);
1.44 albertel 524: my $ret = $parser->parse($string);
525: my $result='['.&mt('Algebra unconverted due to previous errors').']';
526: if ( ref($ret) ) {
1.50 albertel 527: #$parser->tostring();
1.44 albertel 528: $parser->normalize();
529: my $latex=$parser->tolatex();
1.49 albertel 530: $latex=&postprocess_algebra($latex);
1.58 albertel 531: if ($style eq 'display') {
532: $latex='$$'.$latex.'$$x';
533: } else {
1.61 albertel 534: # style is 'inline'
1.58 albertel 535: $latex='\\ensuremath{'.$latex.'}';
536: }
1.44 albertel 537: if ($target eq 'web' || $target eq 'analyze') {
1.89 droeschl 538: my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
539: $result = &converted(\$latex,$display);
540: # $result = &converted(\$latex);
1.44 albertel 541: } else {
542: $result = $latex;
543: }
544: } else {
545: &Apache::lonxml::error($parser->{'htmlerror'});
546: }
547: }
548:
1.46 albertel 549: sub prepare_algebra {
550: my ($string)=@_;
551:
1.50 albertel 552: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 553: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 554:
1.46 albertel 555: return $string;
556: }
557:
558: sub postprocess_algebra {
559: my ($string)=@_;
1.48 albertel 560:
1.50 albertel 561: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 562: # $string =~s/\\fun/ /g;
1.47 albertel 563:
1.51 albertel 564: # sqrt(3,4) means the 4 root of 3
1.52 albertel 565: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
566:
1.53 albertel 567: # log(3,4) means the log base 4 of 3
568: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
569:
1.54 albertel 570: # log(3,4) means the log base 4 of 3
571: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
572:
1.55 albertel 573: # int(3,a,b) integral from a to b of 3
574: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
575:
576: # int( ... dx) -> ...
577: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 578:
1.56 albertel 579: #
580: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 581: return $string;
582: }
1.1 harris41 583: 1;
584: __END__
585:
586:
1.91 jms 587: =pod
588:
589: =head1 NAME
590:
591: Apache::lontexconvert;
592:
593: =head1 SYNOPSIS
594:
595: Access to tth/ttm
596:
597: This is part of the LearningOnline Network with CAPA project
598: described at http://www.lon-capa.org.
599:
600:
601: =head1 SUBROUTINES
602:
603: =over
604:
605: =item init_tth()
606:
607: Header
608:
609: =item convert_real()
610:
611: we need this routine because &converted can get called from inside
612: of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
613: allow the opcode for alarm, so we need to compile this before we get
614: into the safe space since opcode checks only occur at compile time
615:
616: =item tth_converted()
617:
618:
619: =item clean_out_math_mode()
620:
621:
622: =item displaystyle()
623:
624:
625: =item jsMath_converted()
626:
1.109 dseaton 627: =item MathJax_converted()
628: - Mimics the jsMath functionality
1.91 jms 629:
630: =item tex_engine()
631:
632:
633: =item init_math_support()
634:
1.105 raeburn 635: =item mimetex_valign()
636:
637: Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the
638: vertical alignment, before the subsequent call to mimetex_converted()
639: which generates the <img> tag and the corresponding image.
640:
641: Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex).
642: Output: 1. $valign - number of pixels: positive or negative integer
643: which will be included in <img> tag for mimetex image to
644: support vertical alignment of image within a line of text.
645:
646: If a server is running SSL, and Apache rewrite rules are in place
647: to rewrite requests for http to https, modification will most likely
648: be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.
649:
650: Example rewrite rules which rewrite all http traffic to https,
651: except HEAD requests for /cgi-bin/mimetex.cgi are:
652:
653: <IfModule mod_rewrite.c>
654: RewriteEngine On
655: RewriteLogLevel 0
656:
657: RewriteCond %{HTTPS} off
658: RewriteCond %{HTTP:Host} (.*)
659: RewriteCond %{REQUEST_METHOD} !HEAD
660: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
661:
662: RewriteCond %{HTTPS} off
663: RewriteCond %{HTTP:Host} (.*)
664: RewriteCond %{REQUEST_METHOD} HEAD
665: RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi
666: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
667: </IfModule>
1.91 jms 668:
669: =item mimetex_converted()
670:
671:
672: =item converted()
673:
674:
675: =item to_convert()
676:
677: message display
678:
679: =item smiley()
680:
681: ???
682:
683: =item msgtexconverted()
684:
685: =item algebra()
686:
687: =item prepare_algebra()
688:
689: =item postprocess_algebra()
1.1 harris41 690:
1.91 jms 691: =back
1.1 harris41 692:
1.91 jms 693: =cut
1.1 harris41 694:
695:
696:
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