Annotation of loncom/xml/lontexconvert.pm, revision 1.114
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.114 ! raeburn 4: # $Id: lontexconvert.pm,v 1.113 2013/09/15 23:06:46 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($errorstring);
1.73 albertel 45: #use Apache::lonxml();
1.33 albertel 46: use Apache::lonlocal;
1.65 albertel 47: use Apache::lonnet;
1.75 www 48: use lib '/home/httpd/lib/perl/';
49: use LONCAPA;
1.94 raeburn 50: use URI::Escape;
51: use IO::Socket::INET;
1.1 harris41 52:
1.110 foxr 53:
54: #
55: # Table of substitutions to unicode characters.
56: #
1.114 ! raeburn 57:
! 58: my %unicode_harpoons = (
! 59: '\rightleftharpoons' => 0x21cc,
! 60: );
! 61:
1.110 foxr 62: my %unicode_translations = (
1.111 foxr 63:
1.114 ! raeburn 64: # Brackets - unicode for browsers/OS which support it.
! 65:
! 66: '' => 0x23a1,
! 67: '' => 0x23a2,
! 68: '' => 0x23a3, # when unicode catches up with browsers
! 69: '' => 0x23a4, # use these instead of the cheesey brackets below
! 70: '' => 0x23a5,
! 71: '' => 0x23a6,
! 72:
! 73: # Parens - unicode for browsers/OS which support it
! 74:
! 75: '' => 0x239b,
! 76: '' => 0x239c,
! 77: '' => 0x239d,
! 78: '' => 0x239e,
! 79: '' => 0x239f,
! 80: '' => 0x23a0,
! 81:
! 82: );
! 83:
! 84: my %ascii_8bit_translations = (
! 85:
! 86: # Brackets - pure 8-bit ascii ugliness for browsers/OS which can't handle unicode
1.111 foxr 87:
88: '' => 0x5b,
89: '' => 0x5b, # '['
90: '' => 0x5b,
91: '' => 0x5d, # ']'
92: '' => 0x5d,
93: '' => 0x5d,
94:
1.114 ! raeburn 95: # Parens - pure 8-bit ascii ugliness for browsers/OS which can't handle unicode
1.111 foxr 96:
97: '' => 0x28,
98: '' => 0x28, # '('
99: '' => 0x28,
100: '' => 0x29,
101: '' => 0x29, # '('
1.114 ! raeburn 102: '' => 0x29,
1.111 foxr 103:
1.110 foxr 104: );
105:
106: ##
107: # Utility to convert elements of a string to unicode:
108: #
109: # @param input - Input string
110: # @param pattern - Pattern to convert
111: # @param unicode - Unicode to substitute for pattern.
112: #
113: # @return string - resulting string.
114: #
115: sub unicode_subst {
116: my ($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: $xmlstring=~s/\s*$//;
1.110 foxr 181: &Apache::lonxml::end_alarm();
182:
1.85 foxr 183: #
1.110 foxr 184: # Several strings produced by tth require
185: # transliteration -> unicode equivalents to render reliably
1.114 ! raeburn 186: # in browsers. %unicode_translations and %unicode_harpoons are tables of
! 187: # string->substitution which we now apply. (%ascii_8bit_translations used
! 188: # instead for Windows XP and mobile devices.
! 189:
! 190: my $use_ascii;
! 191: if ($env{'browser.os'} eq 'win') {
! 192: if (($env{'browser.osversion'}) && ($env{'browser.osversion'} < 6.0)) {
! 193: $use_ascii = 1;
! 194: }
! 195: }
! 196: if ($env{'browser.mobile'}) {
! 197: $use_ascii = 1;
! 198: }
1.110 foxr 199:
200: foreach my $pattern (keys(%unicode_translations)) {
201: my $unicode = $unicode_translations{$pattern};
1.114 ! raeburn 202: if ($use_ascii) {
! 203: $unicode = $ascii_8bit_translations{$pattern};
! 204: }
1.110 foxr 205: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode);
206: }
207:
1.114 ! raeburn 208: foreach my $pattern (keys(%unicode_harpoons)) {
! 209: $xmlstring = &unicode_subst($xmlstring, $pattern, $unicode_harpoons{$pattern});
! 210: }
1.85 foxr 211:
1.36 albertel 212: return ($xmlstring,$errorstring);
213: }
214:
1.59 albertel 215: sub tth_converted {
1.31 albertel 216: my $texstring=shift;
1.34 www 217: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 218: if ($Apache::lontexconvert::messedup) {
1.35 albertel 219: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 220: }
1.59 albertel 221: $$texstring ='\\documentstyle{article}'.$$texstring;
222:
1.31 albertel 223: eval(<<'ENDCONV');
1.36 albertel 224: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 225: ENDCONV
1.32 albertel 226: if ($@) {
1.35 albertel 227: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 228: $Apache::lontexconvert::messedup=1;
229: }
1.37 albertel 230: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
231: $errorstring) {
1.31 albertel 232: &Apache::lonnet::logthis("Trying to kill myself");
233: $Apache::lontexconvert::messedup=1;
1.70 albertel 234: if (ref($Apache::lonxml::request)) {
235: $Apache::lonxml::request->child_terminate();
236: } else {
237: my $request;
238: eval { $request=Apache->request; };
239: if (!$request) {
240: eval { $request=Apache2::RequestUtil->request; };
241: }
242: if ($request) {
243: $request->child_terminate();
244: } else {
245: &Apache::lonnet::logthis("Unable to find a request to do child_terminate on");
246: }
247: }
1.31 albertel 248: }
249: return $xmlstring;
1.1 harris41 250: }
251:
1.62 albertel 252: sub clean_out_math_mode {
253: my ($texstring)=@_;
1.82 albertel 254: $$texstring=~s/(?<!\\)\$//g;
1.62 albertel 255: $$texstring=~s/\\[\)\(\]\[]//g;
256: $$texstring=~s/\\ensuremath//g;
257: return '';
258: }
259:
260: sub displaystyle {
261: my ($texstring)=@_;
1.106 bisitz 262: #has a $$ or \[ or \displaystyle or eqnarray in it, guessinng it's display mode
1.62 albertel 263: if ($$texstring=~/[^\\]\$\$/ ||
1.106 bisitz 264: $$texstring=~/\\\[/ ||
265: $$texstring=~/\\displaystyle/ ||
266: $$texstring=~/eqnarray/
267: ) { return 1; }
1.62 albertel 268: return 0;
269: }
270:
1.109 dseaton 271: sub MathJax_converted {
272: my $texstring=shift;
273: my $tag='math/tex;';
274: if (&displaystyle($texstring)) { $tag='math/tex; mode=display'; }
275: &clean_out_math_mode($texstring);
276: return &MathJax_header().
277: '<script type="'.$tag.'">'.$$texstring.'</script>';
278: }
279:
280: {
281: #Relies heavily on the previous jsMath installation
282: my @MathJax_sent_header;
283: sub MathJax_reset {
284: undef(@MathJax_sent_header);
285: }
286: sub MathJax_push {
287: push(@MathJax_sent_header,0);
288: }
289: sub MathJax_header {
290: if (!@MathJax_sent_header) {
291: &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
292: return '';
293: }
294: return '' if $MathJax_sent_header[-1];
295: $MathJax_sent_header[-1]=1;
296: return
297: '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
298: }
299: #sub MathJax_process {
300: # my $state = pop(@MathJax_sent_header);
301: # return '' if !$state;
302: # return "\n".
303: # '<script type="text/javascript">MathJax.Process()</script>'."\n";
304: #}
305: #sub MathJax_state {
306: # my ($level) = @_;
307: # return $MathJax_sent_header[$level];
308: #}
309: }
310:
311:
1.59 albertel 312: sub jsMath_converted {
313: my $texstring=shift;
314: my $tag='span';
1.62 albertel 315: if (&displaystyle($texstring)) { $tag='div'; }
316: &clean_out_math_mode($texstring);
1.67 albertel 317: return &jsMath_header().
318: '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
319: }
320:
321: {
1.76 albertel 322: my @jsMath_sent_header;
1.67 albertel 323: sub jsMath_reset {
1.76 albertel 324: undef(@jsMath_sent_header);
325: }
326: sub jsMath_push {
327: push(@jsMath_sent_header,0);
1.67 albertel 328: }
329: sub jsMath_header {
1.80 albertel 330: if (!@jsMath_sent_header) {
331: &Apache::lonnet::logthis("mismatched calls of jsMath_header and jsMath_process");
332: return '';
333: }
1.76 albertel 334: return '' if $jsMath_sent_header[-1];
335: $jsMath_sent_header[-1]=1;
1.67 albertel 336: return
337: '<script type="text/javascript">
338: function NoFontMessage () {}
1.78 albertel 339: jsMath = {Parser: {prototype: {environments: {\'eqnarray*\' :[\'Array\',null,null,\'rcl\',[5/18,5/18],3,\'D\']}}}};
1.67 albertel 340: </script>'."\n".
1.71 albertel 341: '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
1.67 albertel 342: }
343: sub jsMath_process {
1.76 albertel 344: my $state = pop(@jsMath_sent_header);
345: return '' if !$state;
1.81 albertel 346: return "\n".
347: '<script type="text/javascript">jsMath.Process()</script>'."\n";
1.67 albertel 348: }
1.84 albertel 349: sub jsMath_state {
350: my ($level) = @_;
351: return $jsMath_sent_header[$level];
352: }
1.62 albertel 353: }
354:
1.83 albertel 355: sub tex_engine {
356: if (exists($env{'form.texengine'})) {
1.88 raeburn 357: if ($env{'form.texengine'} ne '') {
358: return $env{'form.texengine'};
359: }
1.83 albertel 360: }
361: if ($env{'request.course.id'}
362: && exists($env{'course.'.$env{'request.course.id'}.'.texengine'})) {
363: return $env{'course.'.$env{'request.course.id'}.'.texengine'};
364: }
365: if (exists($env{'environment.texengine'})) {
366: return $env{'environment.texengine'};
367: }
368: return 'tth';
369: }
370:
1.72 albertel 371: sub init_math_support {
1.84 albertel 372: my ($inherit_jsmath) = @_;
1.73 albertel 373: &init_tth();
1.76 albertel 374: &Apache::lontexconvert::jsMath_push();
1.84 albertel 375: if (lc(&tex_engine()) eq 'jsmath' ||
376: ($inherit_jsmath && &jsMath_state(-2))) {
1.72 albertel 377: return &Apache::lontexconvert::jsMath_header();
378: }
1.109 dseaton 379: &Apache::lontexconvert::MathJax_push();
380: if (lc(&tex_engine()) eq 'mathjax') { # ||
381: #($inherit_jsmath && &jsMath_state(-2))) {
382: return &Apache::lontexconvert::MathJax_header();
383: }
1.72 albertel 384: return;
385: }
386:
1.92 hauer 387: sub mimetex_valign {
1.94 raeburn 388: my ($esc_texstring)=@_;
389: my $valign = 0;
390: my $path = '/cgi-bin/mimetex.cgi?'.$esc_texstring;
391: my $socket;
392: &Apache::lonxml::start_alarm();
1.108 raeburn 393: $socket = IO::Socket::INET->new(PeerAddr => 'localhost',
1.107 raeburn 394: PeerPort => 'http(80)',
395: Proto => 'tcp');
1.94 raeburn 396: if ($socket) {
1.96 raeburn 397: my $headreq = "HEAD $path HTTP/1.0\r\n\r\n";
1.94 raeburn 398: print $socket $headreq;
399: while (<$socket>) {
400: if (/Vertical\-Align\:\s*?([\-\d]+)/) {
401: $valign = $1;
402: }
403: }
1.105 raeburn 404: $socket->close();
1.92 hauer 405: }
1.94 raeburn 406: &Apache::lonxml::end_alarm();
407: return $valign;
1.92 hauer 408: }
409:
1.62 albertel 410: sub mimetex_converted {
411: my $texstring=shift;
1.97 www 412:
413: # Alt-Argument for screen readers
414: my $alt_string=$$texstring;
415: $alt_string=~s/\"/\'\'/g;
416:
417: # Is this displaystyle?
418:
1.62 albertel 419: my $displaystyle=&displaystyle($texstring);
420:
1.97 www 421: # Remove math environment delimiters
422:
1.62 albertel 423: &clean_out_math_mode($texstring);
424:
425: if ($displaystyle) {
426: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 427: }
1.94 raeburn 428: my $esc_texstring = &uri_escape($$texstring);
429: my $valign = &mimetex_valign($esc_texstring);
1.97 www 430: my $result='<img src="/cgi-bin/mimetex.cgi?'.$esc_texstring.'" style="vertical-align:'.$valign.'px" alt="'.$alt_string.'" />';
1.62 albertel 431: if ($displaystyle) {
1.106 bisitz 432: $result='<div style="text-align:center">'.$result.'</div>';
1.62 albertel 433: }
434: return $result;
1.59 albertel 435: }
436:
437: sub converted {
1.67 albertel 438: my ($string,$mode)=@_;
1.83 albertel 439: if ($mode eq '') { $mode = &tex_engine(); }
1.68 albertel 440: if ($mode =~ /tth/i) {
1.67 albertel 441: return &tth_converted($string);
1.68 albertel 442: } elsif ($mode =~ /jsmath/i) {
1.67 albertel 443: return &jsMath_converted($string);
1.109 dseaton 444: } elsif ($mode =~ /mathjax/i) {
445: return &MathJax_converted($string);
1.68 albertel 446: } elsif ($mode =~ /mimetex/i) {
1.67 albertel 447: return &mimetex_converted($string);
1.98 www 448: } elsif ($mode =~ /raw/i) {
449: return $$string;
1.59 albertel 450: }
1.67 albertel 451: return &tth_converted($string);
1.59 albertel 452: }
453:
1.6 www 454: # ------------------------------------------------------------ Message display
455:
1.9 albertel 456: sub to_convert {
457: my ($string) = @_;
1.102 faziophi 458: &init_tth();
1.22 www 459: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 460: # $string=~s/\s/ /gs;
1.18 albertel 461: $string=&HTML::Entities::decode($string);
1.9 albertel 462: return &converted(\$string);
463: }
464:
1.20 www 465: sub smiley {
1.31 albertel 466: my $expression=shift;
1.99 faziophi 467: my %smileys=(
468: '\:\-*\)' => 'face-smile.png',
1.100 faziophi 469: '8\-\)' => 'face-cool.png',
470: '8\-(I|\|)' => 'face-glasses.png',
1.101 faziophi 471: '\:\-(I|\|)' => 'face-plain.png',
1.99 faziophi 472: '\:\-(o|O|\(\))' => 'face-surprise.png',
1.101 faziophi 473: ':\-\(' => 'face-sad.png',
474: '\;\-\)' => 'face-wink.png',
475: '\:\-(P|p)' => 'face-raspberry.png',
1.100 faziophi 476: '\:\-(\\\|\\/)' => 'face-uncertain.png',
1.101 faziophi 477: '\:\-D' => 'face-smile-big.png',
478: '\:\-(C|\@)' => 'face-angry.png',
1.99 faziophi 479: '\:(\'|\`)\-*\(' => 'face-crying.png',
1.101 faziophi 480: '\:\-(X|x|\#)' => 'face-quiet.png',
481: '\:\-(s|S)' => 'face-uncertain.png',
482: '\:\-\$' => 'face-embarrassed.png',
483: '\:\-\*' => 'face-kiss.png',
1.99 faziophi 484: '\+O\(' => 'face-sick.png',
485: '(\<\;3|\(heart\))' => 'heart.png',
486: '\(rose\)' => 'rose.png',
487: '\(pizza\)' => 'food-pizza.png',
488: '\(cake\)' => 'food-cake.png',
489: '\(ninja\)' => 'face-ninja.png',
490: '\(pirate\)' => 'face-pirate.png',
491: '\((agree|yes)\)' => 'opinion-agree.png',
492: '\((disagree|nay)\)' => 'opinion-disagree.png',
1.101 faziophi 493: '(o|O)\-\)' => 'face-angel.png',
1.99 faziophi 494: );
1.31 albertel 495: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
1.79 albertel 496: foreach my $smiley (keys(%smileys)) {
1.99 faziophi 497: $expression=~s/$smiley/\<img src="$iconpath\/$smileys{$smiley}" \/\>/gs;
1.31 albertel 498: }
499: return $expression;
1.20 www 500: }
501:
1.6 www 502: sub msgtexconverted {
1.39 raeburn 503: my ($message,$email) = @_;
1.17 albertel 504: $errorstring='';
1.25 www 505: my $outmessage='';
506: my $tex=0;
1.79 albertel 507: foreach my $fragment (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
1.25 www 508: if ($tex) {
1.30 albertel 509: if ($email) {
1.79 albertel 510: $outmessage.='</pre><tt>'.&to_convert($fragment).'</tt><pre>';
511: $tex=0;
1.30 albertel 512: } else {
1.79 albertel 513: $outmessage.=&to_convert($fragment);
514: $tex=0;
1.30 albertel 515: }
1.25 www 516: } else {
1.79 albertel 517: $outmessage.=&smiley($fragment);
518: $tex=1;
1.25 www 519: }
520: }
1.64 albertel 521: $message=$outmessage; $outmessage=''; $tex=0;
1.79 albertel 522: foreach my $fragment (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,
523: $message)) {
1.64 albertel 524: if ($tex) {
1.113 raeburn 525: my $algebra = &algebra($fragment, 'web', undef, undef, undef, 'tth');
1.64 albertel 526: if ($email) {
1.103 faziophi 527: $outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
1.79 albertel 528: $tex=0;
1.64 albertel 529: } else {
1.103 faziophi 530: $outmessage.=$algebra;
1.79 albertel 531: $tex=0;
1.64 albertel 532: }
533: } else {
1.103 faziophi 534: $outmessage.=$fragment;
1.79 albertel 535: $tex=1;
1.64 albertel 536: }
537: }
1.24 albertel 538: if (wantarray) {
1.25 www 539: return ($outmessage,$errorstring);
1.24 albertel 540: } else {
1.25 www 541: return $outmessage.$errorstring;
1.24 albertel 542: }
1.1 harris41 543: }
544:
1.44 albertel 545: sub algebra {
1.49 albertel 546: use AlgParser;
1.103 faziophi 547: my ($string,$target,$style,$parstack,$safeeval,$tth)=@_;
1.44 albertel 548: my $parser = new AlgParserWithImplicitExpand;
1.103 faziophi 549: if ($tth eq 'tth') {&init_tth();}
1.46 albertel 550: $string=&prepare_algebra($string);
1.44 albertel 551: my $ret = $parser->parse($string);
552: my $result='['.&mt('Algebra unconverted due to previous errors').']';
553: if ( ref($ret) ) {
1.50 albertel 554: #$parser->tostring();
1.44 albertel 555: $parser->normalize();
556: my $latex=$parser->tolatex();
1.49 albertel 557: $latex=&postprocess_algebra($latex);
1.58 albertel 558: if ($style eq 'display') {
559: $latex='$$'.$latex.'$$x';
560: } else {
1.61 albertel 561: # style is 'inline'
1.58 albertel 562: $latex='\\ensuremath{'.$latex.'}';
563: }
1.44 albertel 564: if ($target eq 'web' || $target eq 'analyze') {
1.89 droeschl 565: my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
566: $result = &converted(\$latex,$display);
567: # $result = &converted(\$latex);
1.44 albertel 568: } else {
569: $result = $latex;
570: }
571: } else {
572: &Apache::lonxml::error($parser->{'htmlerror'});
573: }
574: }
575:
1.46 albertel 576: sub prepare_algebra {
577: my ($string)=@_;
578:
1.50 albertel 579: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 580: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 581:
1.46 albertel 582: return $string;
583: }
584:
585: sub postprocess_algebra {
586: my ($string)=@_;
1.48 albertel 587:
1.50 albertel 588: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 589: # $string =~s/\\fun/ /g;
1.47 albertel 590:
1.51 albertel 591: # sqrt(3,4) means the 4 root of 3
1.52 albertel 592: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
593:
1.53 albertel 594: # log(3,4) means the log base 4 of 3
595: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
596:
1.54 albertel 597: # log(3,4) means the log base 4 of 3
598: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
599:
1.55 albertel 600: # int(3,a,b) integral from a to b of 3
601: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
602:
603: # int( ... dx) -> ...
604: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 605:
1.56 albertel 606: #
607: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 608: return $string;
609: }
1.114 ! raeburn 610:
! 611:
1.1 harris41 612: 1;
613: __END__
614:
615:
1.91 jms 616: =pod
617:
618: =head1 NAME
619:
620: Apache::lontexconvert;
621:
622: =head1 SYNOPSIS
623:
624: Access to tth/ttm
625:
626: This is part of the LearningOnline Network with CAPA project
627: described at http://www.lon-capa.org.
628:
629:
630: =head1 SUBROUTINES
631:
632: =over
633:
634: =item init_tth()
635:
636: Header
637:
638: =item convert_real()
639:
640: we need this routine because &converted can get called from inside
641: of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
642: allow the opcode for alarm, so we need to compile this before we get
643: into the safe space since opcode checks only occur at compile time
644:
645: =item tth_converted()
646:
647:
648: =item clean_out_math_mode()
649:
650:
651: =item displaystyle()
652:
653:
654: =item jsMath_converted()
655:
1.109 dseaton 656: =item MathJax_converted()
657: - Mimics the jsMath functionality
1.91 jms 658:
659: =item tex_engine()
660:
661:
662: =item init_math_support()
663:
1.105 raeburn 664: =item mimetex_valign()
665:
666: Makes a HEAD call to /cgi-bin/mimetex.cgi via IO:: to retrieve the
667: vertical alignment, before the subsequent call to mimetex_converted()
668: which generates the <img> tag and the corresponding image.
669:
670: Input: 1. $esc_texstring (escaped TeX to be rendered by mimetex).
671: Output: 1. $valign - number of pixels: positive or negative integer
672: which will be included in <img> tag for mimetex image to
673: support vertical alignment of image within a line of text.
674:
675: If a server is running SSL, and Apache rewrite rules are in place
676: to rewrite requests for http to https, modification will most likely
677: be needed for pass through for HEAD requests for /cgi-bin/mimetex.cgi.
678:
679: Example rewrite rules which rewrite all http traffic to https,
680: except HEAD requests for /cgi-bin/mimetex.cgi are:
681:
682: <IfModule mod_rewrite.c>
683: RewriteEngine On
684: RewriteLogLevel 0
685:
686: RewriteCond %{HTTPS} off
687: RewriteCond %{HTTP:Host} (.*)
688: RewriteCond %{REQUEST_METHOD} !HEAD
689: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
690:
691: RewriteCond %{HTTPS} off
692: RewriteCond %{HTTP:Host} (.*)
693: RewriteCond %{REQUEST_METHOD} HEAD
694: RewriteCond %{REQUEST_URI} !^/cgi-bin/mimetex.cgi
695: RewriteRule ^/(.*) https://%1/$1 [R=301,L]
696: </IfModule>
1.91 jms 697:
698: =item mimetex_converted()
699:
700:
701: =item converted()
702:
703:
704: =item to_convert()
705:
706: message display
707:
708: =item smiley()
709:
710: ???
711:
712: =item msgtexconverted()
713:
714: =item algebra()
715:
716: =item prepare_algebra()
717:
718: =item postprocess_algebra()
1.1 harris41 719:
1.91 jms 720: =back
1.1 harris41 721:
1.91 jms 722: =cut
1.1 harris41 723:
724:
725:
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