Annotation of loncom/xml/lontexconvert.pm, revision 1.117
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.117 ! damieng 4: # $Id: lontexconvert.pm,v 1.116 2014/06/18 06:48:03 raeburn 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($errorstring);
1.73 albertel 45: #use Apache::lonxml();
1.33 albertel 46: use Apache::lonlocal;
1.65 albertel 47: use Apache::lonnet;
1.75 www 48: use lib '/home/httpd/lib/perl/';
49: use LONCAPA;
1.94 raeburn 50: use URI::Escape;
51: use IO::Socket::INET;
1.1 harris41 52:
1.110 foxr 53:
54: #
55: # Table of substitutions to unicode characters.
56: #
1.114 raeburn 57:
58: my %unicode_harpoons = (
59: '\rightleftharpoons' => 0x21cc,
60: );
61:
1.110 foxr 62: my %unicode_translations = (
1.111 foxr 63:
1.114 raeburn 64: # Brackets - unicode for browsers/OS which support it.
65:
66: '' => 0x23a1,
67: '' => 0x23a2,
1.115 raeburn 68: '' => 0x23a3,
69: '' => 0x23a4,
1.114 raeburn 70: '' => 0x23a5,
1.116 raeburn 71: '' => 0x23a6,
1.114 raeburn 72:
73: # Parens - unicode for browsers/OS which support it
74:
75: '' => 0x239b,
76: '' => 0x239c,
77: '' => 0x239d,
78: '' => 0x239e,
79: '' => 0x239f,
80: '' => 0x23a0,
81:
82: );
83:
84: my %ascii_8bit_translations = (
85:
86: # Brackets - pure 8-bit ascii ugliness for browsers/OS which can't handle unicode
1.111 foxr 87:
88: '' => 0x5b,
89: '' => 0x5b, # '['
90: '' => 0x5b,
91: '' => 0x5d, # ']'
92: '' => 0x5d,
93: '' => 0x5d,
94:
1.114 raeburn 95: # Parens - pure 8-bit ascii ugliness for browsers/OS which can't handle unicode
1.111 foxr 96:
97: '' => 0x28,
98: '' => 0x28, # '('
99: '' => 0x28,
100: '' => 0x29,
101: '' => 0x29, # '('
1.114 raeburn 102: '' => 0x29,
1.111 foxr 103:
1.110 foxr 104: );
105:
106: ##
107: # Utility to convert elements of a string to unicode:
108: #
109: # @param input - Input string
110: # @param pattern - Pattern to convert
111: # @param unicode - Unicode to substitute for pattern.
112: #
113: # @return string - resulting string.
114: #
115: sub unicode_subst {
116: my ($input, $pattern, $unicode) = @_;
117:
118: my $char = pack('U', $unicode);
119:
120: $input =~ s/$pattern/$char/g;
121:
122: return $input;
123: }
124:
1.1 harris41 125: # ====================================================================== Header
126:
1.29 albertel 127: sub init_tth {
1.65 albertel 128: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
1.74 albertel 129: if ($options =~ /\S/) {
130: $options = ' '.$options;
131: } else {
132: undef($options);
133: }
1.65 albertel 134: if ($env{'browser.mathml'}) {
1.29 albertel 135: &tth::ttminit();
1.65 albertel 136: if ($env{'browser.unicode'}) {
1.74 albertel 137: &tth::ttmoptions('-L -u1'.$options);
1.29 albertel 138: } else {
1.74 albertel 139: &tth::ttmoptions('-L -u0'.$options);
1.29 albertel 140: }
141: } else {
142: &tth::tthinit();
1.65 albertel 143: if ($env{'browser.unicode'}) {
1.74 albertel 144: &tth::tthoptions('-L -u1'.$options);
1.29 albertel 145: } else {
1.74 albertel 146: &tth::tthoptions('-L -u0'.$options);
1.29 albertel 147: }
148: }
149: }
150:
1.1 harris41 151: # ================================================================== Conversion
152:
1.19 albertel 153: $Apache::lontexconvert::messedup=0;
1.36 albertel 154:
1.91 jms 155:
1.36 albertel 156: sub convert_real {
157: my ($texstring)=@_;
158: my ($xmlstring,$errorstring);
159: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
160: local $SIG{ALRM}=sub {
1.37 albertel 161: &Apache::lonnet::logthis("ALRM");
1.36 albertel 162: $xmlstring='['.&mt("TeX unconverted due to errors").']';
163: $Apache::lontexconvert::messedup=1;
164: die &mt("TeX unconverted due to errors");
165: };
1.63 albertel 166: &Apache::lonxml::start_alarm();
1.65 albertel 167: if ($env{'browser.mathml'}) {
1.36 albertel 168: $xmlstring=&tth::ttm($$texstring);
169: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
170: $xmlstring=~s/\<br\>/\<br\/\>/g;
171: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
172: $errorstring.=&tth::ttmerror();
173: } else {
174: $xmlstring=&tth::tth($$texstring);
175: $errorstring.=&tth::ttherror();
176: $xmlstring=~s-</font(\s*)>-</font>-g;
177: }
1.43 www 178: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 179: $xmlstring=~s/^\s*//;
180: $xmlstring=~s/\s*$//;
1.117 ! damieng 181: $xmlstring=~s/^<br \/><table/<table/;
1.110 foxr 182: &Apache::lonxml::end_alarm();
183:
1.85 foxr 184: #
1.116 raeburn 185: # Several strings produced by tth require
1.110 foxr 186: # transliteration -> unicode equivalents to render reliably
1.114 raeburn 187: # in browsers. %unicode_translations and %unicode_harpoons are tables of
1.116 raeburn 188: # string->substitution which we now apply. (%ascii_8bit_translations used
1.114 raeburn 189: # instead for Windows XP and mobile devices.
190:
191: my $use_ascii;
192: if ($env{'browser.os'} eq 'win') {
193: if (($env{'browser.osversion'}) && ($env{'browser.osversion'} < 6.0)) {
194: $use_ascii = 1;
195: }
196: }
197: if ($env{'browser.mobile'}) {
198: $use_ascii = 1;
199: }
1.110 foxr 200:
201: foreach my $pattern (keys(%unicode_translations)) {
202: my $unicode = $unicode_translations{$pattern};
1.114 raeburn 203: if ($use_ascii) {
204: $unicode = $ascii_8bit_translations{$pattern};
205: }
1.110 foxr 206: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode);
207: }
208:
1.114 raeburn 209: foreach my $pattern (keys(%unicode_harpoons)) {
210: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode_harpoons{$pattern});
211: }
1.85 foxr 212:
1.36 albertel 213: return ($xmlstring,$errorstring);
214: }
215:
1.59 albertel 216: sub tth_converted {
1.31 albertel 217: my $texstring=shift;
1.34 www 218: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 219: if ($Apache::lontexconvert::messedup) {
1.35 albertel 220: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 221: }
1.59 albertel 222: $$texstring ='\\documentstyle{article}'.$$texstring;
223:
1.31 albertel 224: eval(<<'ENDCONV');
1.36 albertel 225: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 226: ENDCONV
1.32 albertel 227: if ($@) {
1.35 albertel 228: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 229: $Apache::lontexconvert::messedup=1;
230: }
1.37 albertel 231: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
232: $errorstring) {
1.31 albertel 233: &Apache::lonnet::logthis("Trying to kill myself");
234: $Apache::lontexconvert::messedup=1;
1.70 albertel 235: if (ref($Apache::lonxml::request)) {
236: $Apache::lonxml::request->child_terminate();
237: } else {
238: my $request;
239: eval { $request=Apache->request; };
240: if (!$request) {
241: eval { $request=Apache2::RequestUtil->request; };
242: }
243: if ($request) {
244: $request->child_terminate();
245: } else {
246: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
247: }
248: }
1.31 albertel 249: }
250: return $xmlstring;
1.1 harris41 251: }
252:
1.62 albertel 253: sub clean_out_math_mode {
254: my ($texstring)=@_;
1.82 albertel 255: $$texstring=~s/(?<!\\)\$//g;
1.62 albertel 256: $$texstring=~s/\\[\)\(\]\[]//g;
257: $$texstring=~s/\\ensuremath//g;
258: return '';
259: }
260:
261: sub displaystyle {
262: my ($texstring)=@_;
1.106 bisitz 263: #has a $$ or \[ or \displaystyle or eqnarray in it, guessinng it's display mode
1.62 albertel 264: if ($$texstring=~/[^\\]\$\$/ ||
1.106 bisitz 265: $$texstring=~/\\\[/ ||
266: $$texstring=~/\\displaystyle/ ||
267: $$texstring=~/eqnarray/
268: ) { return 1; }
1.62 albertel 269: return 0;
270: }
271:
1.109 dseaton 272: sub MathJax_converted {
273: my $texstring=shift;
274: my $tag='math/tex;';
275: if (&displaystyle($texstring)) { $tag='math/tex; mode=display'; }
276: &clean_out_math_mode($texstring);
277: return &MathJax_header().
278: '<script type="'.$tag.'">'.$$texstring.'</script>';
279: }
280:
281: {
282: #Relies heavily on the previous jsMath installation
283: my @MathJax_sent_header;
284: sub MathJax_reset {
285: undef(@MathJax_sent_header);
286: }
287: sub MathJax_push {
288: push(@MathJax_sent_header,0);
289: }
290: sub MathJax_header {
291: if (!@MathJax_sent_header) {
292: &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
293: return '';
294: }
295: return '' if $MathJax_sent_header[-1];
296: $MathJax_sent_header[-1]=1;
297: return
298: '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
299: }
300: #sub MathJax_process {
301: # my $state = pop(@MathJax_sent_header);
302: # return '' if !$state;
303: # return "\n".
304: # '<script type="text/javascript">MathJax.Process()</script>'."\n";
305: #}
306: #sub MathJax_state {
307: # my ($level) = @_;
308: # return $MathJax_sent_header[$level];
309: #}
310: }
311:
312:
1.59 albertel 313: sub jsMath_converted {
314: my $texstring=shift;
315: my $tag='span';
1.62 albertel 316: if (&displaystyle($texstring)) { $tag='div'; }
317: &clean_out_math_mode($texstring);
1.67 albertel 318: return &jsMath_header().
319: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
320: }
321:
322: {
1.76 albertel 323: my @jsMath_sent_header;
1.67 albertel 324: sub jsMath_reset {
1.76 albertel 325: undef(@jsMath_sent_header);
326: }
327: sub jsMath_push {
328: push(@jsMath_sent_header,0);
1.67 albertel 329: }
330: sub jsMath_header {
1.80 albertel 331: if (!@jsMath_sent_header) {
332: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
333: return '';
334: }
1.76 albertel 335: return '' if $jsMath_sent_header[-1];
336: $jsMath_sent_header[-1]=1;
1.67 albertel 337: return
338: '<script type="text/javascript">
339: function NoFontMessage () {}
1.78 albertel 340: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67 albertel 341: </script>'."\n".
1.71 albertel 342: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67 albertel 343: }
344: sub jsMath_process {
1.76 albertel 345: my $state = pop(@jsMath_sent_header);
346: return '' if !$state;
1.81 albertel 347: return "\n".
348: '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67 albertel 349: }
1.84 albertel 350: sub jsMath_state {
351: my ($level) = @_;
352: return $jsMath_sent_header[$level];
353: }
1.62 albertel 354: }
355:
1.83 albertel 356: sub tex_engine {
357: if (exists($env{'form.texengine'})) {
1.88 raeburn 358: if ($env{'form.texengine'} ne '') {
359: return $env{'form.texengine'};
360: }
1.83 albertel 361: }
362: if ($env{'request.course.id'}
363: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
364: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
365: }
366: if (exists($env{'environment.texengine'})) {
367: return $env{'environment.texengine'};
368: }
369: return 'tth';
370: }
371:
1.72 albertel 372: sub init_math_support {
1.84 albertel 373: my ($inherit_jsmath) = @_;
1.73 albertel 374: &init_tth();
1.76 albertel 375: &Apache::lontexconvert::jsMath_push();
1.84 albertel 376: if (lc(&tex_engine()) eq 'jsmath' ||
377: ($inherit_jsmath && &jsMath_state(-2))) {
1.72 albertel 378: return &Apache::lontexconvert::jsMath_header();
379: }
1.109 dseaton 380: &Apache::lontexconvert::MathJax_push();
381: if (lc(&tex_engine()) eq 'mathjax') { # ||
382: #($inherit_jsmath && &jsMath_state(-2))) {
383: return &Apache::lontexconvert::MathJax_header();
384: }
1.72 albertel 385: return;
386: }
387:
1.92 hauer 388: sub mimetex_valign {
1.94 raeburn 389: my ($esc_texstring)=@_;
390: my $valign = 0;
391: my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
392: my $socket;
393: &Apache::lonxml::start_alarm();
1.108 raeburn 394: $socket = IO::Socket::INET->new(PeerAddr => 'localhost',
1.107 raeburn 395: PeerPort => 'http(80)',
396: Proto => 'tcp');
1.94 raeburn 397: if ($socket) {
1.96 raeburn 398: my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94 raeburn 399: print $socket $headreq;
400: while (<$socket>) {
401: if (/Vertical\-Align\:\s*?([\-\d]+)/) {
402: $valign = $1;
403: }
404: }
1.105 raeburn 405: $socket->close();
1.92 hauer 406: }
1.94 raeburn 407: &Apache::lonxml::end_alarm();
408: return $valign;
1.92 hauer 409: }
410:
1.62 albertel 411: sub mimetex_converted {
412: my $texstring=shift;
1.97 www 413:
414: # Alt-Argument for screen readers
415: my $alt_string=$$texstring;
416: $alt_string=~s/\"/\'\'/g;
417:
418: # Is this displaystyle?
419:
1.62 albertel 420: my $displaystyle=&displaystyle($texstring);
421:
1.97 www 422: # Remove math environment delimiters
423:
1.62 albertel 424: &clean_out_math_mode($texstring);
425:
426: if ($displaystyle) {
427: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 428: }
1.94 raeburn 429: my $esc_texstring = &uri_escape($$texstring);
430: my $valign = &mimetex_valign($esc_texstring);
1.97 www 431: my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62 albertel 432: if ($displaystyle) {
1.106 bisitz 433: $result='<div style="text-align:center">'.$result.'</div>';
1.62 albertel 434: }
435: return $result;
1.59 albertel 436: }
437:
438: sub converted {
1.67 albertel 439: my ($string,$mode)=@_;
1.83 albertel 440: if ($mode eq '') { $mode = &tex_engine(); }
1.68 albertel 441: if ($mode =~ /tth/i) {
1.67 albertel 442: return &tth_converted($string);
1.68 albertel 443: } elsif ($mode =~ /jsmath/i) {
1.67 albertel 444: return &jsMath_converted($string);
1.109 dseaton 445: } elsif ($mode =~ /mathjax/i) {
446: return &MathJax_converted($string);
1.68 albertel 447: } elsif ($mode =~ /mimetex/i) {
1.67 albertel 448: return &mimetex_converted($string);
1.98 www 449: } elsif ($mode =~ /raw/i) {
450: return $$string;
1.59 albertel 451: }
1.67 albertel 452: return &tth_converted($string);
1.59 albertel 453: }
454:
1.6 www 455: # ------------------------------------------------------------ Message display
456:
1.9 albertel 457: sub to_convert {
458: my ($string) = @_;
1.102 faziophi 459: &init_tth();
1.22 www 460: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 461: # $string=~s/\s/ /gs;
1.18 albertel 462: $string=&HTML::Entities::decode($string);
1.9 albertel 463: return &converted(\$string);
464: }
465:
1.20 www 466: sub smiley {
1.31 albertel 467: my $expression=shift;
1.99 faziophi 468: my %smileys=(
469: '\:\-*\)' => 'face-smile.png',
1.100 faziophi 470: '8\-\)' => 'face-cool.png',
471: '8\-(I|\|)' => 'face-glasses.png',
1.101 faziophi 472: '\:\-(I|\|)' => 'face-plain.png',
1.99 faziophi 473: '\:\-(o|O|\(\))' => 'face-surprise.png',
1.101 faziophi 474: ':\-\(' => 'face-sad.png',
475: '\;\-\)' => 'face-wink.png',
476: '\:\-(P|p)' => 'face-raspberry.png',
1.100 faziophi 477: '\:\-(\\\|\\/)' => 'face-uncertain.png',
1.101 faziophi 478: '\:\-D' => 'face-smile-big.png',
479: '\:\-(C|\@)' => 'face-angry.png',
1.99 faziophi 480: '\:(\'|\`)\-*\(' => 'face-crying.png',
1.101 faziophi 481: '\:\-(X|x|\#)' => 'face-quiet.png',
482: '\:\-(s|S)' => 'face-uncertain.png',
483: '\:\-\$' => 'face-embarrassed.png',
484: '\:\-\*' => 'face-kiss.png',
1.99 faziophi 485: '\+O\(' => 'face-sick.png',
486: '(\<\;3|\(heart\))' => 'heart.png',
487: '\(rose\)' => 'rose.png',
488: '\(pizza\)' => 'food-pizza.png',
489: '\(cake\)' => 'food-cake.png',
490: '\(ninja\)' => 'face-ninja.png',
491: '\(pirate\)' => 'face-pirate.png',
492: '\((agree|yes)\)' => 'opinion-agree.png',
493: '\((disagree|nay)\)' => 'opinion-disagree.png',
1.101 faziophi 494: '(o|O)\-\)' => 'face-angel.png',
1.99 faziophi 495: );
1.31 albertel 496: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79 albertel 497: foreach my $smiley (keys(%smileys)) {
1.99 faziophi 498: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs;
1.31 albertel 499: }
500: return $expression;
1.20 www 501: }
502:
1.6 www 503: sub msgtexconverted {
1.39 raeburn 504: my ($message,$email) = @_;
1.17 albertel 505: $errorstring='';
1.25 www 506: my $outmessage='';
507: my $tex=0;
1.79 albertel 508: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
1.25 www 509: if ($tex) {
1.30 albertel 510: if ($email) {
1.79 albertel 511: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
512: $tex=0;
1.30 albertel 513: } else {
1.79 albertel 514: $outmessage.=&to_convert($fragment);
515: $tex=0;
1.30 albertel 516: }
1.25 www 517: } else {
1.79 albertel 518: $outmessage.=&smiley($fragment);
519: $tex=1;
1.25 www 520: }
521: }
1.64 albertel 522: $message=$outmessage; $outmessage=''; $tex=0;
1.79 albertel 523: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
524: $message)) {
1.64 albertel 525: if ($tex) {
1.113 raeburn 526: my $algebra = &algebra($fragment, 'web', undef, undef, undef, 'tth');
1.64 albertel 527: if ($email) {
1.103 faziophi 528: $outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
1.79 albertel 529: $tex=0;
1.64 albertel 530: } else {
1.103 faziophi 531: $outmessage.=$algebra;
1.79 albertel 532: $tex=0;
1.64 albertel 533: }
534: } else {
1.103 faziophi 535: $outmessage.=$fragment;
1.79 albertel 536: $tex=1;
1.64 albertel 537: }
538: }
1.24 albertel 539: if (wantarray) {
1.25 www 540: return ($outmessage,$errorstring);
1.24 albertel 541: } else {
1.25 www 542: return $outmessage.$errorstring;
1.24 albertel 543: }
1.1 harris41 544: }
545:
1.44 albertel 546: sub algebra {
1.49 albertel 547: use AlgParser;
1.103 faziophi 548: my ($string,$target,$style,$parstack,$safeeval,$tth)=@_;
1.44 albertel 549: my $parser = new AlgParserWithImplicitExpand;
1.103 faziophi 550: if ($tth eq 'tth') {&init_tth();}
1.46 albertel 551: $string=&prepare_algebra($string);
1.44 albertel 552: my $ret = $parser->parse($string);
553: my $result='['.&mt('Algebra unconverted due to previous errors').']';
554: if ( ref($ret) ) {
1.50 albertel 555: #$parser->tostring();
1.44 albertel 556: $parser->normalize();
557: my $latex=$parser->tolatex();
1.49 albertel 558: $latex=&postprocess_algebra($latex);
1.58 albertel 559: if ($style eq 'display') {
560: $latex='$$'.$latex.'$$x';
561: } else {
1.61 albertel 562: # style is 'inline'
1.58 albertel 563: $latex='\\ensuremath{'.$latex.'}';
564: }
1.44 albertel 565: if ($target eq 'web' || $target eq 'analyze') {
1.89 droeschl 566: my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
567: $result = &converted(\$latex,$display);
568: # $result = &converted(\$latex);
1.44 albertel 569: } else {
570: $result = $latex;
571: }
572: } else {
573: &Apache::lonxml::error($parser->{'htmlerror'});
574: }
575: }
576:
1.46 albertel 577: sub prepare_algebra {
578: my ($string)=@_;
579:
1.50 albertel 580: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 581: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 582:
1.46 albertel 583: return $string;
584: }
585:
586: sub postprocess_algebra {
587: my ($string)=@_;
1.48 albertel 588:
1.50 albertel 589: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 590: # $string =~s/\\fun/ /g;
1.47 albertel 591:
1.51 albertel 592: # sqrt(3,4) means the 4 root of 3
1.52 albertel 593: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
594:
1.53 albertel 595: # log(3,4) means the log base 4 of 3
596: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
597:
1.54 albertel 598: # log(3,4) means the log base 4 of 3
599: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
600:
1.55 albertel 601: # int(3,a,b) integral from a to b of 3
602: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
603:
604: # int( ... dx) -> ...
605: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 606:
1.56 albertel 607: #
608: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 609: return $string;
610: }
1.114 raeburn 611:
612:
1.1 harris41 613: 1;
614: __END__
615:
616:
1.91 jms 617: =pod
618:
619: =head1 NAME
620:
621: Apache::lontexconvert;
622:
623: =head1 SYNOPSIS
624:
625: Access to tth/ttm
626:
627: This is part of the LearningOnline Network with CAPA project
628: described at http://www.lon-capa.org.
629:
630:
631: =head1 SUBROUTINES
632:
633: =over
634:
635: =item init_tth()
636:
637: Header
638:
639: =item convert_real()
640:
641: we need this routine because &converted can get called from inside
642: of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
643: allow the opcode for alarm, so we need to compile this before we get
644: into the safe space since opcode checks only occur at compile time
645:
646: =item tth_converted()
647:
648:
649: =item clean_out_math_mode()
650:
651:
652: =item displaystyle()
653:
654:
655: =item jsMath_converted()
656:
1.109 dseaton 657: =item MathJax_converted()
658: - Mimics the jsMath functionality
1.91 jms 659:
660: =item tex_engine()
661:
662:
663: =item init_math_support()
664:
1.105 raeburn 665: =item mimetex_valign()
666:
667: Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the
668: vertical alignment, before the subsequent call to mimetex_converted()
669: which generates the <img> tag and the corresponding image.
670:
671: Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex).
672: Output: 1. $valign - number of pixels: positive or negative integer
673: which will be included in <img> tag for mimetex image to
674: support vertical alignment of image within a line of text.
675:
676: If a server is running SSL, and Apache rewrite rules are in place
677: to rewrite requests for http to https, modification will most likely
678: be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.
679:
680: Example rewrite rules which rewrite all http traffic to https,
681: except HEAD requests for /cgi-bin/mimetex.cgi are:
682:
683: <IfModule mod_rewrite.c>
684: RewriteEngine On
685: RewriteLogLevel 0
686:
687: RewriteCond %{HTTPS} off
688: RewriteCond %{HTTP:Host} (.*)
689: RewriteCond %{REQUEST_METHOD} !HEAD
690: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
691:
692: RewriteCond %{HTTPS} off
693: RewriteCond %{HTTP:Host} (.*)
694: RewriteCond %{REQUEST_METHOD} HEAD
695: RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi
696: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
697: </IfModule>
1.91 jms 698:
699: =item mimetex_converted()
700:
701:
702: =item converted()
703:
704:
705: =item to_convert()
706:
707: message display
708:
709: =item smiley()
710:
711: ???
712:
713: =item msgtexconverted()
714:
715: =item algebra()
716:
717: =item prepare_algebra()
718:
719: =item postprocess_algebra()
1.1 harris41 720:
1.91 jms 721: =back
1.1 harris41 722:
1.91 jms 723: =cut
1.1 harris41 724:
725:
726:
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