1: # The LearningOnline Network with CAPA
2: # chemical equation style response
3: #
4: # $Id: chemresponse.pm,v 1.75 2007/10/15 09:47:29 foxr Exp $
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: use Apache::lonlocal;
34: use lib '/home/httpd/lib/perl/';
35: use LONCAPA;
36:
37:
38: BEGIN {
39: &Apache::lonxml::register('Apache::chemresponse',('organicresponse','organicstructure','reactionresponse','chem'));
40: }
41:
42: sub chem_standard_order {
43: my ($reaction) = @_;
44: my ($re,$pr) = split(/->|<=>/,$reaction);
45: my @reactants = split(/\s\+/,$re);
46: my @products = split(/\s\+/,$pr);
47: foreach my $substance (@reactants,@products) {
48: $substance =~ s/(\^\d*)\s+/$1_/g; # protect superscript space
49: $substance =~ s/\s*//g; # strip whitespace
50: $substance =~ s/_/ /g; # restore superscript space
51: }
52: @reactants = sort @reactants;
53: @products = sort @products;
54: my $standard = '';
55: foreach my $substance (@reactants) {
56: $standard .= $substance;
57: $standard .= ' + ';
58: }
59: $standard =~ s/ \+ $//; # get rid of trailing plus sign
60: $standard .= ' -> ';
61: foreach my $substance (@products) {
62: $standard .= $substance;
63: $standard .= ' + ';
64: }
65: $standard =~ s/ \+ $//; # get rid of trailing plus sign
66: return $standard;
67: }
68:
69: sub separate_jme_window {
70: my ($smile_input,$jme_input,$molecule,$options,$shown_text)=@_;
71: my $smilesection;
72: if (defined($smile_input)) {
73: $smilesection=<<SMILESECTION;
74: smiles = document.applets.JME.smiles();
75: opener.document.lonhomework.$smile_input.value = smiles;
76: SMILESECTION
77: }
78: my $jmesection;
79: if (defined($jme_input)) {
80: $jmesection=<<JMESECTION;
81: jmeFile = document.applets.JME.jmeFile();
82: opener.document.lonhomework.$jme_input.value = jmeFile;
83: JMESECTION
84: }
85:
86: if ($molecule) { $molecule='<param name="jme" value="'.$molecule.'" />'; }
87: my $insert_answer;
88: if ($shown_text eq '') {
89: $insert_answer=
90: '<input type="button" name="submit" value="Insert Answer" onclick="javascript:submitSmiles();" />';
91: }
92:
93: my $js = <<CHEMJS;
94: <script type="text/javascript">
95: function submitSmiles() {
96: jmeFile = document.applets.JME.jmeFile();
97: if (jmeFile == "") {
98: alert("Nothing to submit");
99: } else {
100: $jmesection
101: $smilesection
102: window.close();
103: }
104: }
105: function openHelpWindow() {
106: window.open("/adm/jme/jme_help.html","","scrollbars=yes,resizable=yes,width=500,height=600");
107: }
108: function substituent(r) {document.applets.JME.setSubstituent(r);}
109: </script>
110: CHEMJS
111:
112: my $start_page =
113: &Apache::loncommon::start_page('Molecule Editor',undef,
114: {'only_body' => 1,
115: 'js_ready' => 1,
116: 'bgcolor' => '#FFFFFF',});
117: my $end_page =
118: &Apache::loncommon::end_page({'js_ready' => 1,});
119:
120: my $body=<<CHEMPAGE;
121: $js
122: <center>
123: <form>
124: <table width="440"><tr>
125: <td></td>
126: <td align="right">
127: <select onchange="javascript:substituent(options[selectedIndex].text)">
128: <option>Select substituent</option>
129: <option>-C(=O)OH</option>
130: <option>-C(=O)OMe</option>
131: <option>-OC(=O)Me</option>
132: <option>-CMe3</option>
133: <option>-CF3</option>
134: <option>-CCl3</option>
135: <option>-NO2</option>
136: <option>-SO2-NH2</option>
137: <option>-NH-SO2-Me</option>
138: <option>-NMe2</option>
139: <option>-C#N</option>
140: <option>-C#C-Me</option>
141: <option>-C#CH</option>
142: </select>
143: </td></tr>
144: </table>
145: <applet code="JME.class" name="JME" archive="/adm/jme/JME.jar" width="440" height="390" mayscript>
146: You have to enable Java and JavaScript on your machine.
147: $molecule
148: <param name="options" value="$options" />
149: </applet><br />
150: <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>
151: <br />
152: $insert_answer
153: <br />
154: <input type="button" value=" Close " onclick = "javascript:window.close()" />
155:
156: <input type="button" value=" Help " onclick = "javascript:openHelpWindow()" />
157: </form>
158: </center>
159: CHEMPAGE
160:
161: $body=&Apache::loncommon::js_ready($body);
162: my $nothing=&Apache::lonhtmlcommon::javascript_nothing();
163: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
164: my $display=&mt('Draw Molecule');
165: if (defined($shown_text)) { $display=&mt($shown_text); }
166: my $function =
167: 'LONCAPA_draw_molecule_'.&Apache::lonhtmlcommon::get_uniq_name();
168: my $result=<<CHEMINPUT;
169: <script type="text/javascript">
170: function $function() {
171: editor=window.open($nothing,'jmeedit','width=500,height=500,menubar=no,scrollbars=no,resizable=yes');
172: editor.$docopen;
173: editor.document.write('$start_page $body $end_page');
174: editor.document.close();
175: editor.focus();
176: }
177: </script>
178: <input type="button" value="$display" onclick="javascript:$function();void(0);" />
179: CHEMINPUT
180: return $result;
181: }
182:
183: sub jme_img {
184: my ($jme,$smile,$width,$options)=@_;
185: my $id=&Apache::loncommon::get_cgi_id();
186: my $result='<img alt="'.$smile.'" src="/cgi-bin/convertjme.pl?'.$id.'"';
187: if ($options =~ /border/) { $result.= ' border="1"'; }
188: $result.=' />';
189: &Apache::lonnet::appenv('cgi.'.$id.'.JME' =>
190: &escape($jme),
191: 'cgi.'.$id.'.PNG' => 1,
192: 'cgi.'.$id.'.WIDTH' => $width);
193: return $result;
194: }
195:
196: sub start_organicresponse {
197: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
198: my $result;
199: my $partid = $Apache::inputtags::part;
200: my $id = &Apache::response::start_response($parstack,$safeeval);
201: if ($target eq 'meta') {
202: $result=&Apache::response::meta_package_write('organicresponse');
203: } elsif ($target eq 'web') {
204: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
205: $safeeval);
206: if ( &Apache::response::show_answer() && $jmeanswer ne '') {
207: my $options=&Apache::lonxml::get_param('options',$parstack,
208: $safeeval);
209: my $width=&Apache::lonxml::get_param('width',$parstack,
210: $safeeval);
211: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
212: $safeeval);
213: $result.=&jme_img($jmeanswer,$answers[0],$width,$options);
214: } else {
215: my $molecule;
216: if (defined($Apache::lonhomework::history{"resource.$partid.$id.molecule"})) {
217: $molecule=$Apache::lonhomework::history{"resource.$partid.$id.molecule"};
218: } else {
219: $molecule=&Apache::lonxml::get_param('molecule',$parstack,
220: $safeeval);
221: }
222: my $options=&Apache::lonxml::get_param('options',$parstack,
223: $safeeval);
224: my $shown_text;
225: if (&Apache::response::show_answer()) {
226: $shown_text="Show Your Last Answer";
227: }
228: $result=&separate_jme_window("HWVAL_$id","MOLECULE_$id",$molecule,
229: $options,$shown_text);
230: $result.= '<input type="hidden" name="MOLECULE_'.$id.'" value="" />';
231: }
232: } elsif ($target eq 'edit') {
233: $result .=&Apache::edit::tag_start($target,$token);
234: my $options=&Apache::lonxml::get_param('options',$parstack,
235: $safeeval);
236: if ($options !~ /multipart/) { $options.=',multipart'; }
237: $result .='<nobr>'.
238: &Apache::edit::text_arg('Starting Molecule:','molecule',
239: $token,40);
240: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
241: $safeeval);
242: $result .=&separate_jme_window(undef,
243: &Apache::edit::html_element_name('molecule'),
244: $molecule,$options);
245: $result .='</nobr><br /><nobr>';
246: $result .=&Apache::edit::text_arg('Correct Answer:','answer',
247: $token,40);
248: $result .='</nobr><br /><nobr>';
249: $result .=&Apache::edit::text_arg('JME string of the answer (automatically updated when using the Draw Molecule button):',
250: 'jmeanswer',$token);
251: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
252: $safeeval);
253: $result .=&separate_jme_window(
254: &Apache::edit::html_element_name('answer'),
255: &Apache::edit::html_element_name('jmeanswer'),
256: $jmeanswer,$options);
257: $result .='</nobr><br />';
258: $result .=&Apache::edit::checked_arg('Options:','options',
259: [ ['autoez','Auto E,Z stereochemistry'],
260: ['multipart','Multipart Structures'],
261: ['nostereo','No stereochemistry'],
262: ['reaction','Is a reaction'],
263: ['number','Able to number atoms'] ],
264: ,$token);
265: $result .=&Apache::edit::text_arg('Width of correct answer image:',
266: 'width',$token,10);
267: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
268: } elsif ($target eq 'modified') {
269: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
270: $safeeval,'molecule',
271: 'answer','jmeanswer',
272: 'options','width');
273: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
274: }
275:
276: return $result;
277: }
278:
279: sub end_organicresponse {
280: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
281: my $result;
282:
283: my $partid = $Apache::inputtags::part;
284: my $id = $Apache::inputtags::response['-1'];
285:
286: if ($target eq 'grade'
287: && &Apache::response::submitted()
288: && $Apache::lonhomework::type eq 'exam') {
289:
290: &Apache::response::scored_response($partid,$id);
291:
292: } elsif ($target eq 'grade'
293: && &Apache::response::submitted()
294: && $Apache::lonhomework::type ne 'exam') {
295:
296: &Apache::response::setup_params($$tagstack[-1],$safeeval);
297: my $response = &Apache::response::getresponse();
298: if ( $response =~ /[^\s]/) {
299: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
300: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
301: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
302: my $ad;
303: foreach my $answer (@answers) {
304: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
305: if ($response eq $answer) {
306: $ad='EXACT_ANS';
307: last;
308: } else {
309: $ad='INCORRECT';
310: }
311: }
312: if ($ad && $Apache::lonhomework::type eq 'survey') {
313: $ad='SUBMITTED';
314: }
315: &Apache::response::handle_previous(\%previous,$ad);
316: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
317: $Apache::lonhomework::results{"resource.$partid.$id.molecule"}=$env{"form.MOLECULE_$id"};
318: }
319: } elsif ($target eq "edit") {
320: $result.= &Apache::edit::tag_end($target,$token,'');
321: } elsif ($target eq 'answer') {
322: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
323: $safeeval);
324: $result.=&Apache::response::answer_header('organicresponse');
325: foreach my $answer (@answers) {
326: $result.=&Apache::response::answer_part('organicresponse',$answer);
327: }
328: $result.=&Apache::response::answer_footer('organicresponse');
329: }
330: if ($target eq 'web') {
331: &Apache::response::setup_prior_tries_hash(\&format_prior_answer_organic,
332: ['molecule'])
333: }
334:
335: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
336: $target eq 'tex' || $target eq 'analyze') {
337: &Apache::lonxml::increment_counter(&Apache::response::repetition(),
338: "$partid.$id"); # part.response
339: if ($target eq 'analyze') {
340: &Apache::lonhomework::set_bubble_lines();
341: }
342: }
343: &Apache::response::end_response();
344: return $result;
345: }
346:
347: sub format_prior_answer_organic {
348: my ($mode,$answer,$other_data) = @_;
349: my $result=&mt('Smile representation: "[_1]"','<tt>'.$answer.'</tt>');
350: my $jme=$other_data->[0];
351: $result.=&jme_img($jme,$answer,400);
352: return $result;
353: }
354:
355: sub start_organicstructure {
356: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
357: my $result;
358: if ($target eq 'web') {
359: my $width=&Apache::lonxml::get_param('width',$parstack,$safeeval);
360: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
361: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
362: my $id=&Apache::loncommon::get_cgi_id();
363: $result="<img src='/cgi-bin/convertjme.pl?$id'";
364: if ($options =~ /border/) { $result.= ' border="1"'; }
365: $result.=' />';
366: &Apache::lonnet::appenv(
367: 'cgi.'.$id.'.JME' => &escape($molecule),
368: 'cgi.'.$id.'.PNG' => 1,
369: 'cgi.'.$id.'.WIDTH' => $width );
370: } elsif ($target eq 'tex') {
371: my $texwidth=&Apache::lonxml::get_param('texwidth',$parstack,$safeeval,undef,1);
372: my $webwidth=&Apache::lonxml::get_param('width', $parstack, $safeeval);
373: my $webheight=&Apache::lonxml::get_param('height', $parstack, $safeeval);
374: if (!$webheight) { $webheight = $webwidth; }
375: if (!$texwidth) { $texwidth='90'; }
376: $result = "%DYNAMICIMAGE:$webwidth:$webheight:$texwidth\n";
377: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
378: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
379: my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
380: '_'.time.'_'.$$.int(rand(1000)).'_organicstructure';
381: my $id=$filename;
382: &Apache::lonnet::appenv(
383: 'cgi.'.$id.'.JME' => &escape($molecule),
384: 'cgi.'.$id.'.PS' => 1,
385: 'cgi.'.$id.'.WIDTH' => $texwidth );
386: $id=&escape($id);
387: &Apache::lonxml::register_ssi("/cgi-bin/convertjme.pl?$id");
388: if ($options =~ /border/) { $result.= '\fbox{'; }
389: $result .= '\graphicspath{{/home/httpd/perl/tmp/}}\includegraphics[width='.$texwidth.' mm]{'.$filename.'.eps}';
390: if ($options =~ /border/) { $result.= '} '; }
391: } elsif ($target eq 'edit') {
392: $result .=&Apache::edit::tag_start($target,$token);
393: $result .=&Apache::edit::text_arg('Width (pixels):','width',$token,5);
394: $result .=&Apache::edit::text_arg('TeXwidth (mm):','texwidth',$token,5);
395: $result .='<nobr>';
396: $result .=&Apache::edit::text_arg('Molecule:','molecule',$token,40);
397: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
398: $safeeval);
399: my $options=&Apache::lonxml::get_param('options',$parstack,
400: $safeeval);
401: if ($options !~ /reaction/) {
402: $options.= ',multipart,number';
403: }
404:
405: $result .=&separate_jme_window(undef,
406: &Apache::edit::html_element_name('molecule'),
407: $molecule,$options);
408: $result.="</nobr><br />";
409: $result .=&Apache::edit::checked_arg('Options:','options',
410: [ ['reaction','Is a reaction'],
411: ['border','Draw a border'] ],
412: $token);
413: $result .=&Apache::edit::end_row();
414: } elsif ($target eq 'modified') {
415: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
416: $safeeval,'molecule',
417: 'width','texwidth',
418: 'options');
419: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
420: }
421: return $result;
422: }
423:
424: sub end_organicstructure {
425: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
426: my $result;
427: if ($target eq "edit") {
428: $result.= &Apache::edit::tag_end($target,$token,'');
429: }
430: return $result;
431: }
432:
433: sub edit_reaction_button {
434: my ($id,$field,$reaction)=@_;
435: my $id_es=&escape($id);
436: my $field_es=&escape($field);
437: my $reaction_es=&escape($reaction);
438: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
439: my $start_page =
440: &Apache::loncommon::start_page('LON-CAPA Reaction Editor',undef,
441: {'frameset' => 1,
442: 'js_ready' => 1,
443: 'add_entries' => {
444: 'rows' => "30%,*",
445: 'border' => "0",}},);
446: my $end_page =
447: &Apache::loncommon::end_page({'frameset' => 1,
448: 'js_ready' => 1});
449: my $result=<<EDITREACTION;
450: <script type="text/javascript">
451: // <!--
452: function create_reaction_window_${id}_${field} () {
453: editor=window.open('','','width=500,height=270,scrollbars=no,resizable=yes');
454: editor.$docopen;
455: editor.document.writeln('$start_page <frame src="/res/adm/pages/reactionresponse/reaction_viewer.html?inhibitmenu=yes" name="viewer" scrolling="no" /> <frame src="/res/adm/pages/reactionresponse/reaction_editor.html?inhibitmenu=yes&reaction=$reaction_es&id=$id_es&field=$field_es" name="editor" scrolling="no" /> $end_page');
456: editor.document.close();
457: }
458: // -->
459: </script>
460: <input type='button' value='Edit Answer' onclick="javascript:create_reaction_window_${id}_${field}();void(0);" />
461: EDITREACTION
462: return $result;
463: }
464:
465: sub start_reactionresponse {
466: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
467: my $result;
468: my $id = &Apache::response::start_response($parstack,$safeeval);
469: if ($target eq 'meta') {
470: $result=&Apache::response::meta_package_write('reactionresponse');
471: } elsif ($target eq 'web') {
472: my $partid = $Apache::inputtags::part;
473: my $id = $Apache::inputtags::response['-1'];
474: my $reaction=$Apache::lonhomework::history{"resource.$partid.$id.submission"};
475: if ($reaction eq '') { $reaction=&Apache::lonxml::get_param('initial',$parstack,$safeeval); }
476: my $status=$Apache::inputtags::status['-1'];
477: if ($status eq 'CAN_ANSWER') {
478: $result.=&edit_reaction_button($id,"HWVAL_$id",$reaction);
479: }
480: if ( &Apache::response::show_answer() ) {
481: my $ans=&Apache::lonxml::get_param('answer',$parstack,$safeeval);
482: if (!$Apache::lonxml::default_homework_loaded) {
483: &Apache::lonxml::default_homework_load($safeeval);
484: }
485: @Apache::scripttag::parser_env = @_;
486: $Apache::inputtags::answertxt{$id}=[&Apache::run::run("return &chemparse(q\0$ans\0);",$safeeval)];
487: }
488: } elsif ($target eq "edit") {
489: $result .=&Apache::edit::tag_start($target,$token);
490: my $answer=&Apache::lonxml::get_param('answer',$parstack,
491: $safeeval);
492: $result .='<nobr>'.
493: &Apache::edit::text_arg('Answer:','answer',$token,40);
494: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('answer'),$answer).'</nobr>';
495: my $initial=&Apache::lonxml::get_param('initial',$parstack,$safeeval);
496: $result.='<nobr>'.
497: &Apache::edit::text_arg('Initial Reaction:','initial',$token,40);
498: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('initial'),$initial).'</nobr>';
499:
500: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
501: } elsif ($target eq 'modified') {
502: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
503: $safeeval,'answer',
504: 'initial');
505: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
506: }
507: return $result;
508: }
509:
510: sub end_reactionresponse {
511: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
512: my $result;
513:
514: my $partid = $Apache::inputtags::part;
515: my $id = $Apache::inputtags::response['-1'];
516:
517: if ($target eq 'grade'
518: && &Apache::response::submitted()
519: && $Apache::lonhomework::type eq 'exam') {
520:
521: &Apache::response::scored_response($partid,$id);
522:
523: } elsif ($target eq 'grade'
524: && &Apache::response::submitted()
525: && $Apache::lonhomework::type ne 'exam') {
526:
527: &Apache::response::setup_params($$tagstack[-1],$safeeval);
528: my $response = &Apache::response::getresponse();
529: if ( $response =~ /[^\s]/) {
530: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
531: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
532: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
533: my $ad;
534: foreach my $answer (@answers) {
535: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
536: if (&chem_standard_order($response) eq
537: &chem_standard_order($answer)) {
538: $ad='EXACT_ANS';
539: } else {
540: $ad='INCORRECT';
541: }
542: }
543: if ($ad && $Apache::lonhomework::type eq 'survey') {
544: $ad='SUBMITTED';
545: }
546: &Apache::response::handle_previous(\%previous,$ad);
547: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
548: }
549: } elsif ($target eq "edit") {
550: $result.= &Apache::edit::tag_end($target,$token,'');
551: } elsif ($target eq 'answer') {
552: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
553: $safeeval);
554: $result.=&Apache::response::answer_header('reactionresponse');
555: foreach my $answer (@answers) {
556: $result.=&Apache::response::answer_part('reactionresponse',
557: $answer);
558: }
559: $result.=&Apache::response::answer_footer('reactionresponse');
560: }
561: if ($target eq 'web') {
562: &Apache::response::setup_prior_tries_hash(\&format_prior_response_reaction);
563: }
564:
565: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
566: $target eq 'tex' || $target eq 'analyze') {
567: &Apache::lonxml::increment_counter(&Apache::response::repetition(), "$partid.$id");
568: }
569: &Apache::response::end_response();
570: return $result;
571: }
572:
573: sub format_prior_response_reaction {
574: my ($mode,$answer) =@_;
575: return '<span class="LC_prior_reaction">'.
576: &HTML::Entities::encode($answer,'"<>&').'</span>';
577: }
578:
579: sub start_chem {
580: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
581: my $result = '';
582: my $inside = &Apache::lonxml::get_all_text_unbalanced("/chem",$parser);
583: if ($target eq 'tex' || $target eq 'web') {
584: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
585: if (!$Apache::lonxml::default_homework_loaded) {
586: &Apache::lonxml::default_homework_load($safeeval);
587: }
588: @Apache::scripttag::parser_env = @_;
589: $result=&Apache::run::run("return &chemparse(q\0$inside\0);",$safeeval);
590: }
591: return $result;
592: }
593:
594: sub end_chem {
595: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
596: my $result = '';
597: return $result;
598: }
599:
600: 1;
601: __END__
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