Annotation of loncom/homework/chemresponse.pm, revision 1.54
1.1 albertel 1: # The LearningOnline Network with CAPA
2: # chemical equation style response
3: #
1.54 ! albertel 4: # $Id: chemresponse.pm,v 1.53 2005/05/25 21:45:07 albertel Exp $
1.1 albertel 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: #
29: package Apache::chemresponse;
30: use strict;
31: use Apache::lonxml;
32: use Apache::lonnet;
33:
34: BEGIN {
1.46 albertel 35: &Apache::lonxml::register('Apache::chemresponse',('organicresponse','organicstructure','reactionresponse','chem'));
1.1 albertel 36: }
37:
1.34 albertel 38: sub chem_standard_order {
39: my ($reaction) = @_;
40: my ($re,$pr) = split(/->|<=>/,$reaction);
41: my @reactants = split(/\s\+/,$re);
42: my @products = split(/\s\+/,$pr);
43: foreach my $substance (@reactants,@products) {
44: $substance =~ s/(\^\d*)\s+/$1_/g; # protect superscript space
45: $substance =~ s/\s*//g; # strip whitespace
46: $substance =~ s/_/ /g; # restore superscript space
47: }
48: @reactants = sort @reactants;
49: @products = sort @products;
50: my $standard = '';
51: foreach my $substance (@reactants) {
52: $standard .= $substance;
53: $standard .= ' + ';
54: }
55: $standard =~ s/ \+ $//; # get rid of trailing plus sign
56: $standard .= ' -> ';
57: foreach my $substance (@products) {
58: $standard .= $substance;
59: $standard .= ' + ';
60: }
61: $standard =~ s/ \+ $//; # get rid of trailing plus sign
62: return $standard;
63: }
64:
1.30 www 65: sub separate_jme_window {
1.6 albertel 66: my ($smile_input,$jme_input,$molecule,$options)=@_;
1.2 albertel 67: my $smilesection;
68: if (defined($smile_input)) {
69: $smilesection=<<SMILESECTION;
1.21 albertel 70: smiles = document.applets.JME.smiles();
1.2 albertel 71: opener.document.lonhomework.$smile_input.value = smiles;
72: SMILESECTION
73: }
74: my $jmesection;
75: if (defined($jme_input)) {
76: $jmesection=<<JMESECTION;
77: jmeFile = document.applets.JME.jmeFile();
78: opener.document.lonhomework.$jme_input.value = jmeFile;
79: JMESECTION
80: }
81:
1.14 albertel 82: if ($molecule) { $molecule='<param name="jme" value="'.$molecule.'" />'; }
1.1 albertel 83: my $body=<<CHEMPAGE;
84: <html>
85: <head>
86: <title>Molecule Editor</title>
1.47 albertel 87: <script type="text/javascript">
1.1 albertel 88: function submitSmiles() {
1.21 albertel 89: jmeFile = document.applets.JME.jmeFile();
90: if (jmeFile == "") {
1.1 albertel 91: alert("Nothing to submit");
92: } else {
1.21 albertel 93: $jmesection
1.2 albertel 94: $smilesection
1.1 albertel 95: window.close();
96: }
97: }
98: function openHelpWindow() {
1.2 albertel 99: window.open("/adm/jme/jme_help.html","","scrollbars=yes,resizable=yes,width=500,height=600");
1.1 albertel 100: }
101: </script>
102: </head>
103: <body bgcolor="#ffffff">
104: <center>
1.27 albertel 105: <applet code="JME.class" name="JME" archive="/adm/jme/JME.jar" width="440" height="390">
1.1 albertel 106: You have to enable Java and JavaScript on your machine.
1.12 albertel 107: $molecule
1.6 albertel 108: <param name="options" value="$options" />
1.1 albertel 109: </applet><br />
1.49 albertel 110: <font face="arial,helvetica,sans-serif" size="-1"><a href="http://www.molinspiration.com/jme/index.html">JME Editor</a> courtesy of Peter Ertl, Novartis</font>
1.1 albertel 111: <form>
1.47 albertel 112: <input type="button" name="submit" value="Insert Answer" onclick = "submitSmiles();" />
1.1 albertel 113: <br />
1.47 albertel 114: <input type="button" value=" Close " onclick = "window.close()" />
1.1 albertel 115:
1.47 albertel 116: <input type="button" value=" Help " onclick = "openHelpWindow()" />
1.1 albertel 117: </form>
118: </center>
119: </body>
120: </html>
121: CHEMPAGE
1.32 albertel 122: $body=&HTML::Entities::encode($body,'<>&"');
1.1 albertel 123: $body=~s/\n/ /g;
1.53 albertel 124: my $nothing=&Apache::lonhtmlcommon::javascript_nothing();
1.41 www 125: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
1.1 albertel 126: my $result=<<CHEMINPUT;
1.54 ! albertel 127: <input type="button" value="Draw Molecule" onclick="javascript:editor=window.open($nothing,'jmeedit','width=500,height=500,menubar=yes,scrollbars=no,resizable=yes');editor.$docopen;editor.document.write('$body');editor.document.close();editor.focus()" />
1.1 albertel 128: CHEMINPUT
129: return $result;
130: }
131:
1.6 albertel 132: sub start_organicresponse {
1.1 albertel 133: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
134: my $result;
135: my $partid = $Apache::inputtags::part;
136: my $id = &Apache::response::start_response($parstack,$safeeval);
137: if ($target eq 'meta') {
1.28 albertel 138: $result=&Apache::response::meta_package_write('organicresponse');
1.1 albertel 139: } elsif ($target eq 'web') {
1.44 albertel 140: if ( &Apache::response::show_answer() ) {
141: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
142: $safeeval);
143: my $options=&Apache::lonxml::get_param('options',$parstack,
144: $safeeval);
145: my $width=&Apache::lonxml::get_param('width',$parstack,
146: $safeeval);
147: my $id=&Apache::loncommon::get_cgi_id();
148: $result="<img src='/cgi-bin/convertjme.pl?$id'";
149: if ($options =~ /border/) { $result.= ' border="1"'; }
150: $result.=' />';
151: &Apache::lonnet::appenv('cgi.'.$id.'.JME' =>
152: &Apache::lonnet::escape($jmeanswer),
153: 'cgi.'.$id.'.PNG' => 1,
154: 'cgi.'.$id.'.WIDTH' => $width);
1.1 albertel 155: } else {
1.44 albertel 156: my $molecule;
157: if (defined($Apache::lonhomework::history{"resource.$partid.$id.molecule"})) {
158: $molecule=$Apache::lonhomework::history{"resource.$partid.$id.molecule"};
159: } else {
160: $molecule=&Apache::lonxml::get_param('molecule',$parstack,
161: $safeeval);
162: }
163: my $options=&Apache::lonxml::get_param('options',$parstack,
164: $safeeval);
165: $result=&separate_jme_window("HWVAL_$id","MOLECULE_$id",$molecule,$options);
166: $result.= '<input type="hidden" name="MOLECULE_'.$id.'" value="" />';
1.1 albertel 167: }
1.2 albertel 168: } elsif ($target eq 'edit') {
169: $result .=&Apache::edit::tag_start($target,$token);
1.12 albertel 170: my $options=&Apache::lonxml::get_param('options',$parstack,
171: $safeeval);
172: if ($options !~ /multipart/) { $options.=',multipart'; }
1.7 albertel 173: $result .='<nobr>'.
174: &Apache::edit::text_arg('Starting Molecule:','molecule',
175: $token,40);
1.2 albertel 176: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
177: $safeeval);
1.30 www 178: $result .=&separate_jme_window(undef,
1.2 albertel 179: &Apache::edit::html_element_name('molecule'),
1.12 albertel 180: $molecule,$options);
1.7 albertel 181: $result .='</nobr><br /><nobr>';
1.2 albertel 182: $result .=&Apache::edit::text_arg('Correct Answer:','answer',
183: $token,40);
184: $result .=&Apache::edit::hidden_arg('jmeanswer',$token);
185: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
186: $safeeval);
1.30 www 187: $result .=&separate_jme_window(
1.2 albertel 188: &Apache::edit::html_element_name('answer'),
189: &Apache::edit::html_element_name('jmeanswer'),
1.12 albertel 190: $jmeanswer,$options);
191: $result .='</nobr><br />';
192: $result .=&Apache::edit::checked_arg('Options:','options',
1.29 www 193: [ ['autoez','Auto E,Z stereochemistry'],
1.18 albertel 194: ['multipart','Multipart Structures'],
1.12 albertel 195: ['nostereo','No stereochemistry'],
196: ['reaction','Is a reaction'],
1.18 albertel 197: ['number','Able to number atoms'] ],
1.12 albertel 198: ,$token);
1.44 albertel 199: $result .=&Apache::edit::text_arg('Width of correct answer image:',
200: 'width',$token,10);
1.2 albertel 201: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
202: } elsif ($target eq 'modified') {
203: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
204: $safeeval,'molecule',
1.6 albertel 205: 'answer','jmeanswer',
1.44 albertel 206: 'options','width');
1.2 albertel 207: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.1 albertel 208: }
209: return $result;
210: }
211:
1.6 albertel 212: sub end_organicresponse {
1.1 albertel 213: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
214: my $result;
1.45 albertel 215: if ($target eq 'grade' && &Apache::response::submitted()) {
1.31 albertel 216: &Apache::response::setup_params($$tagstack[-1],$safeeval);
1.1 albertel 217: my $response = &Apache::response::getresponse();
218: if ( $response =~ /[^\s]/) {
219: my $partid = $Apache::inputtags::part;
220: my $id = $Apache::inputtags::response['-1'];
1.13 albertel 221: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
1.1 albertel 222: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
223: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
224: my $ad;
1.13 albertel 225: foreach my $answer (@answers) {
226: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
227: if ($response eq $answer) {
228: $ad='EXACT_ANS';
229: last;
230: } else {
231: $ad='INCORRECT';
232: }
1.1 albertel 233: }
1.42 albertel 234: if ($ad && $Apache::lonhomework::type eq 'survey') {
235: $ad='SUBMITTED';
236: }
1.1 albertel 237: &Apache::response::handle_previous(\%previous,$ad);
238: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
1.50 albertel 239: $Apache::lonhomework::results{"resource.$partid.$id.molecule"}=$env{"form.MOLECULE_$id"};
1.1 albertel 240: }
1.2 albertel 241: } elsif ($target eq "edit") {
242: $result.= &Apache::edit::tag_end($target,$token,'');
1.15 albertel 243: } elsif ($target eq 'answer') {
244: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
245: $safeeval);
246: $result.=&Apache::response::answer_header('organicresponse');
247: foreach my $answer (@answers) {
248: $result.=&Apache::response::answer_part('organicresponse',$answer);
249: }
250: $result.=&Apache::response::answer_footer('organicresponse');
1.1 albertel 251: }
252: &Apache::response::end_response;
253: return $result;
254: }
255:
1.6 albertel 256: sub start_organicstructure {
1.3 albertel 257: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
258: my $result;
259: if ($target eq 'web') {
260: my $width=&Apache::lonxml::get_param('width',$parstack,$safeeval);
261: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
1.12 albertel 262: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
1.23 albertel 263: my $id=&Apache::loncommon::get_cgi_id();
1.19 albertel 264: $result="<img src='/cgi-bin/convertjme.pl?$id'";
265: if ($options =~ /border/) { $result.= ' border="1"'; }
266: $result.=' />';
1.16 albertel 267: &Apache::lonnet::appenv(
268: 'cgi.'.$id.'.JME' => &Apache::lonnet::escape($molecule),
1.17 albertel 269: 'cgi.'.$id.'.PNG' => 1,
1.16 albertel 270: 'cgi.'.$id.'.WIDTH' => $width );
1.17 albertel 271: } elsif ($target eq 'tex') {
1.38 albertel 272: my $texwidth=&Apache::lonxml::get_param('texwidth',$parstack,$safeeval,undef,1);
1.17 albertel 273: if (!$texwidth) { $texwidth='90'; }
274: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
275: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
1.50 albertel 276: my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
1.17 albertel 277: '_'.time.'_'.$$.int(rand(1000)).'_organicstructure';
278: my $id=$filename;
279: &Apache::lonnet::appenv(
280: 'cgi.'.$id.'.JME' => &Apache::lonnet::escape($molecule),
281: 'cgi.'.$id.'.PS' => 1,
282: 'cgi.'.$id.'.WIDTH' => $texwidth );
283: $id=&Apache::lonnet::escape($id);
284: &Apache::lonxml::register_ssi("/cgi-bin/convertjme.pl?$id");
1.20 albertel 285: if ($options =~ /border/) { $result.= '\fbox{'; }
286: $result .= '\graphicspath{{/home/httpd/perl/tmp/}}\includegraphics[width='.$texwidth.' mm]{'.$filename.'.eps}';
287: if ($options =~ /border/) { $result.= '} '; }
1.3 albertel 288: } elsif ($target eq 'edit') {
289: $result .=&Apache::edit::tag_start($target,$token);
1.22 albertel 290: $result .=&Apache::edit::text_arg('Width (pixels):','width',$token,5);
291: $result .=&Apache::edit::text_arg('TeXwidth (mm):','texwidth',$token,5);
1.12 albertel 292: $result .='<nobr>';
1.3 albertel 293: $result .=&Apache::edit::text_arg('Molecule:','molecule',$token,40);
294: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
295: $safeeval);
1.12 albertel 296: my $options=&Apache::lonxml::get_param('options',$parstack,
297: $safeeval);
298: if ($options !~ /reaction/) {
299: $options.= ',multipart,number';
300: }
301:
1.30 www 302: $result .=&separate_jme_window(undef,
1.12 albertel 303: &Apache::edit::html_element_name('molecule'),
304: $molecule,$options);
305: $result.="</nobr><br />";
306: $result .=&Apache::edit::checked_arg('Options:','options',
1.18 albertel 307: [ ['reaction','Is a reaction'],
1.12 albertel 308: ['border','Draw a border'] ],
309: $token);
1.24 albertel 310: $result .=&Apache::edit::end_row();
1.3 albertel 311: } elsif ($target eq 'modified') {
312: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
313: $safeeval,'molecule',
1.22 albertel 314: 'width','texwidth',
315: 'options');
1.3 albertel 316: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
317: }
318: return $result;
1.1 albertel 319: }
320:
1.6 albertel 321: sub end_organicstructure {
1.3 albertel 322: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
323: my $result;
324: if ($target eq "edit") {
325: $result.= &Apache::edit::tag_end($target,$token,'');
326: }
1.4 albertel 327: return $result;
328: }
329:
1.9 albertel 330: sub edit_reaction_button {
1.11 albertel 331: my ($id,$field,$reaction)=@_;
1.10 albertel 332: my $id_es=&Apache::lonnet::escape($id);
333: my $field_es=&Apache::lonnet::escape($field);
1.11 albertel 334: my $reaction_es=&Apache::lonnet::escape($reaction);
1.41 www 335: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
1.9 albertel 336: my $result=<<EDITREACTION;
1.10 albertel 337: <script type="text/javascript">
1.47 albertel 338: // <!--
1.10 albertel 339: function create_reaction_window_${id}_${field} () {
340: editor=window.open('','','width=500,height=270,scrollbars=no,resizable=yes');
1.41 www 341: editor.$docopen;
1.37 albertel 342: editor.document.writeln('<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"><html> <head><title>LON-CAPA Reaction Editor</title></head><frameset rows="30%,*" border="0"> <frame src="/res/adm/pages/reactionresponse/reaction_viewer.html?inhibitmenu=yes" name="viewer" scrolling="no" /> <frame src="/res/adm/pages/reactionresponse/reaction_editor.html?inhibitmenu=yes&reaction=$reaction_es&id=$id_es&field=$field_es" name="editor" scrolling="no" /> </frameset> </html>');
1.10 albertel 343: }
1.47 albertel 344: // -->
1.10 albertel 345: </script>
1.47 albertel 346: <input type='button' value='Edit Answer' onclick="javascript:create_reaction_window_${id}_${field}();void(0);" />
1.9 albertel 347: EDITREACTION
348: return $result;
349: }
350:
1.4 albertel 351: sub start_reactionresponse {
352: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
353: my $result;
354: my $id = &Apache::response::start_response($parstack,$safeeval);
1.10 albertel 355: if ($target eq 'meta') {
1.28 albertel 356: $result=&Apache::response::meta_package_write('reactionresponse');
1.10 albertel 357: } elsif ($target eq 'web') {
1.11 albertel 358: my $partid = $Apache::inputtags::part;
359: my $id = $Apache::inputtags::response['-1'];
360: my $reaction=$Apache::lonhomework::history{"resource.$partid.$id.submission"};
1.35 albertel 361: if ($reaction eq '') { $reaction=&Apache::lonxml::get_param('initial',$parstack,$safeeval); }
1.33 albertel 362: my $status=$Apache::inputtags::status['-1'];
363: if ($status eq 'CAN_ANSWER') {
364: $result.=&edit_reaction_button($id,"HWVAL_$id",$reaction);
365: }
366: if ( &Apache::response::show_answer() ) {
367: my $ans=&Apache::lonxml::get_param('answer',$parstack,$safeeval);
1.51 albertel 368: if (!$Apache::lonxml::default_homework_loaded) {
369: &Apache::lonxml::default_homework_load($safeeval);
370: }
371: @Apache::scripttag::parser_env = @_;
372: $Apache::inputtags::answertxt{$id}=&Apache::run::run("return &chemparse(q\0$ans\0);",$safeeval);
1.33 albertel 373: }
1.4 albertel 374: } elsif ($target eq "edit") {
1.9 albertel 375: $result .=&Apache::edit::tag_start($target,$token);
376: my $answer=&Apache::lonxml::get_param('answer',$parstack,
377: $safeeval);
1.10 albertel 378: $result .='<nobr>'.
379: &Apache::edit::text_arg('Answer:','answer',$token,40);
380: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('answer'),$answer).'</nobr>';
1.35 albertel 381: my $initial=&Apache::lonxml::get_param('initial',$parstack,$safeeval);
382: $result.='<nobr>'.
1.43 albertel 383: &Apache::edit::text_arg('Initial Reaction:','initial',$token,40);
1.35 albertel 384: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('initial'),$initial).'</nobr>';
1.10 albertel 385:
1.9 albertel 386: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
1.10 albertel 387: } elsif ($target eq 'modified') {
388: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.35 albertel 389: $safeeval,'answer',
390: 'initial');
1.10 albertel 391: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.4 albertel 392: }
393: return $result;
394: }
395:
396: sub end_reactionresponse {
397: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
398: my $result;
1.45 albertel 399: if ($target eq 'grade' && &Apache::response::submitted()) {
1.31 albertel 400: &Apache::response::setup_params($$tagstack[-1],$safeeval);
1.10 albertel 401: my $response = &Apache::response::getresponse();
402: if ( $response =~ /[^\s]/) {
403: my $partid = $Apache::inputtags::part;
404: my $id = $Apache::inputtags::response['-1'];
1.15 albertel 405: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
1.10 albertel 406: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
407: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
408: my $ad;
1.13 albertel 409: foreach my $answer (@answers) {
410: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
1.34 albertel 411: if (&chem_standard_order($response) eq
412: &chem_standard_order($answer)) {
1.13 albertel 413: $ad='EXACT_ANS';
414: } else {
415: $ad='INCORRECT';
416: }
1.10 albertel 417: }
1.42 albertel 418: if ($ad && $Apache::lonhomework::type eq 'survey') {
419: $ad='SUBMITTED';
420: }
1.10 albertel 421: &Apache::response::handle_previous(\%previous,$ad);
422: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
423: }
424: } elsif ($target eq "edit") {
1.4 albertel 425: $result.= &Apache::edit::tag_end($target,$token,'');
1.15 albertel 426: } elsif ($target eq 'answer') {
427: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
428: $safeeval);
429: $result.=&Apache::response::answer_header('reactionresponse');
430: foreach my $answer (@answers) {
431: $result.=&Apache::response::answer_part('reactionresponse',
432: $answer);
433: }
434: $result.=&Apache::response::answer_footer('reactionresponse');
1.4 albertel 435: }
436: &Apache::response::end_response;
1.3 albertel 437: return $result;
1.1 albertel 438: }
439:
1.46 albertel 440: sub start_chem {
441: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
442: my $result = '';
1.48 albertel 443: my $inside = &Apache::lonxml::get_all_text_unbalanced("/chem",$parser);
1.46 albertel 444: if ($target eq 'tex' || $target eq 'web') {
1.48 albertel 445: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
446: if (!$Apache::lonxml::default_homework_loaded) {
447: &Apache::lonxml::default_homework_load($safeeval);
448: }
449: @Apache::scripttag::parser_env = @_;
450: $result=&Apache::run::run("return &chemparse(q\0$inside\0);",$safeeval);
1.46 albertel 451: }
452: return $result;
453: }
454:
455: sub end_chem {
456: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
457: my $result = '';
458: return $result;
459: }
460:
1.1 albertel 461: 1;
462: __END__
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