Annotation of loncom/xml/lontexconvert.pm, revision 1.53
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.52 albertel 4: # $Id: lontexconvert.pm,v 1.51 2005/02/24 09:28:54 albertel 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);
1.19 albertel 45: use Apache();
1.33 albertel 46: use Apache::lonmsg();
47: use Apache::lonxml();
48: use Apache::lonmenu();
49: use Apache::lonlocal;
1.1 harris41 50:
51: # ====================================================================== Header
52:
1.29 albertel 53: sub init_tth {
54: my $options=$ENV{'course.'.$ENV{'request.course.id'}.'.tthoptions'};
55: if ($ENV{'browser.mathml'}) {
56: &tth::ttminit();
57: if ($ENV{'browser.unicode'}) {
58: &tth::ttmoptions('-L -u1 '.$options);
59: } else {
60: &tth::ttmoptions('-L -u0 '.$options);
61: }
62: } else {
63: &tth::tthinit();
64: if ($ENV{'browser.unicode'}) {
65: &tth::tthoptions('-L -u1 '.$options);
66: } else {
67: &tth::tthoptions('-L -u0 '.$options);
68: }
69: }
70: }
71:
1.1 harris41 72: sub header {
1.31 albertel 73: $errorstring='';
74: my $time=time;
75: &init_tth();
76: return &Apache::lonxml::xmlbegin().
1.40 albertel 77: "\n<head>\n".
1.31 albertel 78: &Apache::lonxml::fontsettings().
79: &Apache::lonmenu::registerurl(undef,'tex').
80: "\n</head>\n";
1.1 harris41 81: }
82:
83: # ================================================================== Conversion
84:
1.19 albertel 85: $Apache::lontexconvert::messedup=0;
1.36 albertel 86:
87: # we need this routine because &converted can get called from inside
88: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
89: # allow the opcode for alarm, so we need to compile this before we get
90: # into the safe space since opcode checks only occur at compile time
91: sub convert_real {
92: my ($texstring)=@_;
93: my ($xmlstring,$errorstring);
94: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
95: local $SIG{ALRM}=sub {
1.37 albertel 96: &Apache::lonnet::logthis("ALRM");
1.36 albertel 97: $xmlstring='['.&mt("TeX unconverted due to errors").']';
98: $Apache::lontexconvert::messedup=1;
99: die &mt("TeX unconverted due to errors");
100: };
101: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
102: if ($ENV{'browser.mathml'}) {
103: $xmlstring=&tth::ttm($$texstring);
104: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
105: $xmlstring=~s/\<br\>/\<br\/\>/g;
106: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
107: $errorstring.=&tth::ttmerror();
108: } else {
109: $xmlstring=&tth::tth($$texstring);
110: $errorstring.=&tth::ttherror();
111: $xmlstring=~s-</font(\s*)>-</font>-g;
112: }
1.43 www 113: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 114: $xmlstring=~s/^\s*//;
115: $xmlstring=~s/\s*$//;
116: alarm(0);
117: return ($xmlstring,$errorstring);
118: }
119:
1.1 harris41 120: sub converted {
1.31 albertel 121: my $texstring=shift;
1.34 www 122: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 123: if ($Apache::lontexconvert::messedup) {
1.35 albertel 124: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 125: }
126: eval(<<'ENDCONV');
1.36 albertel 127: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 128: ENDCONV
1.32 albertel 129: if ($@) {
1.35 albertel 130: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 131: $Apache::lontexconvert::messedup=1;
132: }
1.37 albertel 133: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
134: $errorstring) {
1.31 albertel 135: &Apache::lonnet::logthis("Trying to kill myself");
136: $Apache::lontexconvert::messedup=1;
137: my $request=Apache->request();
138: $request->child_terminate();
139: }
140: return $xmlstring;
1.1 harris41 141: }
142:
143: # ====================================================================== Footer
144:
145: sub footer {
146: my $xmlstring='';
147: if ($ENV{'request.state'} eq 'construct') {
148: $xmlstring.='<address>'.$errorstring.'</address>';
149: } else {
150: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$errorstring);
151: }
152: # -------------------------------------------------------------------- End Body
1.3 www 153: $xmlstring.=&Apache::lonxml::xmlend();
1.1 harris41 154: return $xmlstring;
1.6 www 155: }
156:
157: # ------------------------------------------------------------ Message display
158:
1.9 albertel 159: sub to_convert {
160: my ($string) = @_;
1.22 www 161: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 162: # $string=~s/\s/ /gs;
1.18 albertel 163: $string=&HTML::Entities::decode($string);
1.9 albertel 164: return &converted(\$string);
165: }
166:
1.20 www 167: sub smiley {
1.31 albertel 168: my $expression=shift;
169: if ($ENV{'browser.imagesuppress'} eq 'on') { return $expression; }
170: my %smileys=('\:\-\)' => 'smiley',
171: '8\-\)' => 'coolsmile',
172: '8\-(I|\|)' => 'coolindiff',
173: ':\-(I|\|)' => 'neutral',
174: '\:\-(o|O|\(\))' => 'shocked',
175: ':\-\(' => 'frowny',
176: '\;\-\)' => 'wink',
177: '\:\-P' => 'baeh',
178: '\:\-(\\\|\\/)' => 'hrrm',
179: '\:\-D' => 'bigsmile',
180: '\:\-C' => 'angry',
181: '\:(\'|\`)\-\(' => 'cry',
182: '\:\-(X|\#)' => 'lipsrsealed',
183: '\:\-S' => 'huh');
184: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
185: foreach (keys %smileys) {
186: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
187: }
188: return $expression;
1.20 www 189: }
190:
1.6 www 191: sub msgtexconverted {
1.39 raeburn 192: my ($message,$email) = @_;
1.17 albertel 193: $errorstring='';
1.29 albertel 194: &init_tth();
1.25 www 195: my $outmessage='';
196: my $tex=0;
197: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
198: if ($tex) {
1.30 albertel 199: if ($email) {
200: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
201: } else {
202: $outmessage.=&to_convert($_); $tex=0;
203: }
1.25 www 204: } else {
205: $outmessage.=&smiley($_); $tex=1;
206: }
207: }
1.24 albertel 208: if (wantarray) {
1.25 www 209: return ($outmessage,$errorstring);
1.24 albertel 210: } else {
1.25 www 211: return $outmessage.$errorstring;
1.24 albertel 212: }
1.1 harris41 213: }
214:
1.44 albertel 215: sub algebra {
1.49 albertel 216: use AlgParser;
217:
1.44 albertel 218: my ($string,$target)=@_;
219: my $parser = new AlgParserWithImplicitExpand;
1.46 albertel 220: $string=&prepare_algebra($string);
1.44 albertel 221: my $ret = $parser->parse($string);
222: my $result='['.&mt('Algebra unconverted due to previous errors').']';
223: if ( ref($ret) ) {
1.50 albertel 224: #$parser->tostring();
1.44 albertel 225: $parser->normalize();
226: my $latex=$parser->tolatex();
1.49 albertel 227: $latex=&postprocess_algebra($latex);
1.45 albertel 228: $latex='$'.$latex.'$';
1.44 albertel 229: if ($target eq 'web' || $target eq 'analyze') {
230: $result = &converted(\$latex);
231: } else {
232: $result = $latex;
233: }
234: } else {
235: &Apache::lonxml::error($parser->{'htmlerror'});
236: }
237: }
238:
1.46 albertel 239: sub prepare_algebra {
240: my ($string)=@_;
241:
1.50 albertel 242: # makes the decision about what is a minus sign easier supposedly
1.48 albertel 243: $string =~ s/([\=\>\<\%\!\#] *)-/$1 zeroplace -/g;
244:
1.46 albertel 245: return $string;
246: }
247:
248: sub postprocess_algebra {
249: my ($string)=@_;
1.48 albertel 250:
1.50 albertel 251: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 252: # $string =~s/\\fun/ /g;
1.47 albertel 253:
1.51 albertel 254: # sqrt(3,4) -> \sqrt\let{3,4\right}, which is annoying
255: $string =~s/\\left\{/\{/g;
256: $string =~s/\\right\}/\}/g;
257:
258: # sqrt(3,4) means the 4 root of 3
1.52 albertel 259: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
260:
1.53 ! albertel 261: # log(3,4) means the log base 4 of 3
! 262: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
! 263:
1.52 albertel 264: # remove the extra () in the denominator of a \frac
265: $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
1.51 albertel 266:
1.53 ! albertel 267:
1.51 albertel 268: &Apache::lonnet::logthis($string);
1.46 albertel 269: return $string;
270: }
1.1 harris41 271: 1;
272: __END__
273:
274:
275:
276:
277:
278:
279:
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