Annotation of loncom/xml/lontexconvert.pm, revision 1.66
1.1 harris41 1: # The LearningOnline Network with CAPA
2: # TeX Conversion Module
3: #
1.66 ! albertel 4: # $Id: lontexconvert.pm,v 1.65 2005/04/07 06:56:27 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;
1.65 albertel 50: use Apache::lonnet;
1.1 harris41 51:
52: # ====================================================================== Header
53:
1.29 albertel 54: sub init_tth {
1.65 albertel 55: my $options=$env{'course.'.$env{'request.course.id'}.'.tthoptions'};
56: if ($env{'browser.mathml'}) {
1.29 albertel 57: &tth::ttminit();
1.65 albertel 58: if ($env{'browser.unicode'}) {
1.29 albertel 59: &tth::ttmoptions('-L -u1 '.$options);
60: } else {
61: &tth::ttmoptions('-L -u0 '.$options);
62: }
63: } else {
64: &tth::tthinit();
1.65 albertel 65: if ($env{'browser.unicode'}) {
1.29 albertel 66: &tth::tthoptions('-L -u1 '.$options);
67: } else {
68: &tth::tthoptions('-L -u0 '.$options);
69: }
70: }
71: }
72:
1.1 harris41 73: sub header {
1.31 albertel 74: $errorstring='';
75: my $time=time;
76: &init_tth();
77: return &Apache::lonxml::xmlbegin().
1.40 albertel 78: "\n<head>\n".
1.31 albertel 79: &Apache::lonxml::fontsettings().
80: &Apache::lonmenu::registerurl(undef,'tex').
81: "\n</head>\n";
1.1 harris41 82: }
83:
84: # ================================================================== Conversion
85:
1.19 albertel 86: $Apache::lontexconvert::messedup=0;
1.36 albertel 87:
88: # we need this routine because &converted can get called from inside
89: # of the safespace (through &xmlparse('<m>stuff</m>') which doesn't
90: # allow the opcode for alarm, so we need to compile this before we get
91: # into the safe space since opcode checks only occur at compile time
92: sub convert_real {
93: my ($texstring)=@_;
94: my ($xmlstring,$errorstring);
95: local $SIG{SEGV}=sub { $Apache::lontexconvert::messedup=1; die; };
96: local $SIG{ALRM}=sub {
1.37 albertel 97: &Apache::lonnet::logthis("ALRM");
1.36 albertel 98: $xmlstring='['.&mt("TeX unconverted due to errors").']';
99: $Apache::lontexconvert::messedup=1;
100: die &mt("TeX unconverted due to errors");
101: };
1.63 albertel 102: &Apache::lonxml::start_alarm();
1.65 albertel 103: if ($env{'browser.mathml'}) {
1.36 albertel 104: $xmlstring=&tth::ttm($$texstring);
105: $xmlstring=~s/\<math\>/\<math xmlns=\"\&mathns\;\"\>/g;
106: $xmlstring=~s/\<br\>/\<br\/\>/g;
107: $xmlstring=~s/\<p\>/\<p\>\<\/p\>/g;
108: $errorstring.=&tth::ttmerror();
109: } else {
110: $xmlstring=&tth::tth($$texstring);
111: $errorstring.=&tth::ttherror();
112: $xmlstring=~s-</font(\s*)>-</font>-g;
113: }
1.43 www 114: $xmlstring=~s/^\s*\<br clear\=\"all\"/\<br/s;
1.36 albertel 115: $xmlstring=~s/^\s*//;
116: $xmlstring=~s/\s*$//;
1.63 albertel 117: &Apache::lonxml::end_alarm();
1.36 albertel 118: return ($xmlstring,$errorstring);
119: }
120:
1.59 albertel 121: sub tth_converted {
1.31 albertel 122: my $texstring=shift;
1.34 www 123: my $xmlstring='['.&mt('UNDISPLAYABLE').']';
1.31 albertel 124: if ($Apache::lontexconvert::messedup) {
1.35 albertel 125: return '['.&mt('TeX unconverted due to previous errors').']';
1.31 albertel 126: }
1.59 albertel 127: $$texstring ='\\documentstyle{article}'.$$texstring;
128:
1.31 albertel 129: eval(<<'ENDCONV');
1.36 albertel 130: ($xmlstring,$errorstring)=&convert_real($texstring)
1.12 www 131: ENDCONV
1.32 albertel 132: if ($@) {
1.35 albertel 133: $errorstring.=&mt("Evaluation Error: ").$@;
1.32 albertel 134: $Apache::lontexconvert::messedup=1;
135: }
1.37 albertel 136: if ($Apache::lontexconvert::messedup || &tth::tthmessedup() ||
137: $errorstring) {
1.31 albertel 138: &Apache::lonnet::logthis("Trying to kill myself");
139: $Apache::lontexconvert::messedup=1;
140: my $request=Apache->request();
141: $request->child_terminate();
142: }
143: return $xmlstring;
1.1 harris41 144: }
145:
1.62 albertel 146: sub clean_out_math_mode {
147: my ($texstring)=@_;
148: $$texstring=~s/(?!\\)\$//g;
149: $$texstring=~s/\\[\)\(\]\[]//g;
150: $$texstring=~s/\\ensuremath//g;
151: return '';
152: }
153:
154: sub displaystyle {
155: my ($texstring)=@_;
156: #has a $$ or \[ or \displaystyle in it, guessinng it's display mode
157: if ($$texstring=~/[^\\]\$\$/ ||
158: $$texstring=~/\\\[/ ||
159: $$texstring=~/\\displaystyle/) { return 1; }
160: return 0;
161: }
162:
1.59 albertel 163: sub jsMath_converted {
164: my $texstring=shift;
165: my $tag='span';
1.62 albertel 166: if (&displaystyle($texstring)) { $tag='div'; }
167: &clean_out_math_mode($texstring);
168: return '<'.$tag.' class="math">'.$$texstring.'</'.$tag.'>';
169: }
170:
171: sub mimetex_converted {
172: my $texstring=shift;
173: my $displaystyle=&displaystyle($texstring);
174:
175: &clean_out_math_mode($texstring);
176:
177: if ($displaystyle) {
178: $$texstring='\\displaystyle \\Large '.$$texstring;
1.59 albertel 179: }
1.62 albertel 180: my $result='<img src="/cgi-bin/mimetex.cgi?'.&Apache::lonnet::escape($$texstring).'" />';
181: if ($displaystyle) {
182: $result='<center>'.$result.'</center>';
183: }
184: return $result;
1.59 albertel 185: }
186:
187: sub converted {
1.65 albertel 188: if ($env{'environment.texengine'} eq 'tth') {
1.59 albertel 189: return &tth_converted;
1.65 albertel 190: } elsif ($env{'environment.texengine'} eq 'jsMath') {
1.59 albertel 191: return &jsMath_converted;
1.65 albertel 192: } elsif ($env{'environment.texengine'} eq 'mimetex') {
1.62 albertel 193: return &mimetex_converted;
1.59 albertel 194: }
195: return &tth_converted;
196: }
197:
1.1 harris41 198: # ====================================================================== Footer
199:
200: sub footer {
201: my $xmlstring='';
1.65 albertel 202: if ($env{'request.state'} eq 'construct') {
1.1 harris41 203: $xmlstring.='<address>'.$errorstring.'</address>';
204: } else {
1.65 albertel 205: &Apache::lonmsg::author_res_msg($env{'request.filename'},$errorstring);
1.1 harris41 206: }
207: # -------------------------------------------------------------------- End Body
1.3 www 208: $xmlstring.=&Apache::lonxml::xmlend();
1.1 harris41 209: return $xmlstring;
1.6 www 210: }
211:
212: # ------------------------------------------------------------ Message display
213:
1.9 albertel 214: sub to_convert {
215: my ($string) = @_;
1.22 www 216: $string=~s/\<br\s*\/?\>/ /gs;
1.30 albertel 217: # $string=~s/\s/ /gs;
1.18 albertel 218: $string=&HTML::Entities::decode($string);
1.9 albertel 219: return &converted(\$string);
220: }
221:
1.20 www 222: sub smiley {
1.31 albertel 223: my $expression=shift;
1.65 albertel 224: if ($env{'browser.imagesuppress'} eq 'on') { return $expression; }
1.31 albertel 225: my %smileys=('\:\-\)' => 'smiley',
226: '8\-\)' => 'coolsmile',
227: '8\-(I|\|)' => 'coolindiff',
228: ':\-(I|\|)' => 'neutral',
229: '\:\-(o|O|\(\))' => 'shocked',
230: ':\-\(' => 'frowny',
231: '\;\-\)' => 'wink',
232: '\:\-P' => 'baeh',
233: '\:\-(\\\|\\/)' => 'hrrm',
234: '\:\-D' => 'bigsmile',
235: '\:\-C' => 'angry',
236: '\:(\'|\`)\-\(' => 'cry',
237: '\:\-(X|\#)' => 'lipsrsealed',
238: '\:\-S' => 'huh');
239: my $iconpath=$Apache::lonnet::perlvar{'lonIconsURL'};
240: foreach (keys %smileys) {
241: $expression=~s/$_/\<img src="$iconpath\/$smileys{$_}.gif" \/\>/gs;
242: }
243: return $expression;
1.20 www 244: }
245:
1.6 www 246: sub msgtexconverted {
1.39 raeburn 247: my ($message,$email) = @_;
1.17 albertel 248: $errorstring='';
1.29 albertel 249: &init_tth();
1.25 www 250: my $outmessage='';
251: my $tex=0;
252: foreach (split(/(?:\<\;|\<)\/*m\s*(?:\>\;|\>)/i,$message)) {
253: if ($tex) {
1.30 albertel 254: if ($email) {
255: $outmessage.='</pre><tt>'.&to_convert($_).'</tt><pre>'; $tex=0;
256: } else {
257: $outmessage.=&to_convert($_); $tex=0;
258: }
1.25 www 259: } else {
260: $outmessage.=&smiley($_); $tex=1;
261: }
262: }
1.64 albertel 263: $message=$outmessage; $outmessage=''; $tex=0;
264: foreach (split(/(?:\<\;|\<)\/*algebra\s*(?:\>\;|\>)/i,$message)) {
265: if ($tex) {
266: if ($email) {
267: $outmessage.='</pre><tt>'.&algebra($_,'web').'</tt><pre>'; $tex=0;
268: } else {
269: $outmessage.=&algebra($_,'web'); $tex=0;
270: }
271: } else {
272: $outmessage.=$_; $tex=1;
273: }
274: }
1.24 albertel 275: if (wantarray) {
1.25 www 276: return ($outmessage,$errorstring);
1.24 albertel 277: } else {
1.25 www 278: return $outmessage.$errorstring;
1.24 albertel 279: }
1.1 harris41 280: }
281:
1.44 albertel 282: sub algebra {
1.49 albertel 283: use AlgParser;
284:
1.58 albertel 285: my ($string,$target,$style)=@_;
1.44 albertel 286: my $parser = new AlgParserWithImplicitExpand;
1.46 albertel 287: $string=&prepare_algebra($string);
1.44 albertel 288: my $ret = $parser->parse($string);
289: my $result='['.&mt('Algebra unconverted due to previous errors').']';
290: if ( ref($ret) ) {
1.50 albertel 291: #$parser->tostring();
1.44 albertel 292: $parser->normalize();
293: my $latex=$parser->tolatex();
1.49 albertel 294: $latex=&postprocess_algebra($latex);
1.58 albertel 295: if ($style eq 'display') {
296: $latex='$$'.$latex.'$$x';
297: } else {
1.61 albertel 298: # style is 'inline'
1.58 albertel 299: $latex='\\ensuremath{'.$latex.'}';
300: }
1.44 albertel 301: if ($target eq 'web' || $target eq 'analyze') {
302: $result = &converted(\$latex);
303: } else {
304: $result = $latex;
305: }
306: } else {
307: &Apache::lonxml::error($parser->{'htmlerror'});
308: }
309: }
310:
1.46 albertel 311: sub prepare_algebra {
312: my ($string)=@_;
313:
1.50 albertel 314: # makes the decision about what is a minus sign easier supposedly
1.57 albertel 315: $string =~ s/(\<\>|\<\=|\>\=[\=\>\<] *)-/$1 zeroplace -/g;
1.48 albertel 316:
1.46 albertel 317: return $string;
318: }
319:
320: sub postprocess_algebra {
321: my ($string)=@_;
1.48 albertel 322:
1.50 albertel 323: # moodle had these and I don't know why, ignoring them for now
1.51 albertel 324: # $string =~s/\\fun/ /g;
1.47 albertel 325:
1.55 albertel 326: # remove the extra () in the denominator of a \frac
327: $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
1.51 albertel 328:
329: # sqrt(3,4) means the 4 root of 3
1.52 albertel 330: $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
331:
1.53 albertel 332: # log(3,4) means the log base 4 of 3
333: $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
334:
1.54 albertel 335: # log(3,4) means the log base 4 of 3
336: $string =~s/\\((?:sin|cos|tan|sec|csc|cot)(?:h)?)\\left\((.+?),(.+?)\\right\)/\\$1^{$3}\\left($2\\right)/gs;
337:
1.55 albertel 338: # int(3,a,b) integral from a to b of 3
339: $string =~s/\\int\\left\((.+?),(.+?),(.+?)\\right\)/\\int_{$2}^{$3}\\left($1\\right)/gs;
340:
341: # int( ... dx) -> ...
342: $string =~s/\\int\\left\((.+?)d[a-z]\\right\)/$1/gs;
1.51 albertel 343:
1.56 albertel 344: #
345: $string =~s/\\lim\\left\((.+?),(.+?),(.+?)\\right\)/\\lim_{$2\\to $3}$1/gs;
1.46 albertel 346: return $string;
347: }
1.1 harris41 348: 1;
349: __END__
350:
351:
352:
353:
354:
355:
356:
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