Annotation of loncom/homework/chemresponse.pm, revision 1.56
1.1 albertel 1: # The LearningOnline Network with CAPA
2: # chemical equation style response
3: #
1.56 ! albertel 4: # $Id: chemresponse.pm,v 1.55 2005/05/26 20:59:47 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;
1.55 albertel 33: use Apache::lonlocal;
1.1 albertel 34:
35: BEGIN {
1.46 albertel 36: &Apache::lonxml::register('Apache::chemresponse',('organicresponse','organicstructure','reactionresponse','chem'));
1.1 albertel 37: }
38:
1.34 albertel 39: sub chem_standard_order {
40: my ($reaction) = @_;
41: my ($re,$pr) = split(/->|<=>/,$reaction);
42: my @reactants = split(/\s\+/,$re);
43: my @products = split(/\s\+/,$pr);
44: foreach my $substance (@reactants,@products) {
45: $substance =~ s/(\^\d*)\s+/$1_/g; # protect superscript space
46: $substance =~ s/\s*//g; # strip whitespace
47: $substance =~ s/_/ /g; # restore superscript space
48: }
49: @reactants = sort @reactants;
50: @products = sort @products;
51: my $standard = '';
52: foreach my $substance (@reactants) {
53: $standard .= $substance;
54: $standard .= ' + ';
55: }
56: $standard =~ s/ \+ $//; # get rid of trailing plus sign
57: $standard .= ' -> ';
58: foreach my $substance (@products) {
59: $standard .= $substance;
60: $standard .= ' + ';
61: }
62: $standard =~ s/ \+ $//; # get rid of trailing plus sign
63: return $standard;
64: }
65:
1.30 www 66: sub separate_jme_window {
1.55 albertel 67: my ($smile_input,$jme_input,$molecule,$options,$shown_text)=@_;
1.2 albertel 68: my $smilesection;
69: if (defined($smile_input)) {
70: $smilesection=<<SMILESECTION;
1.21 albertel 71: smiles = document.applets.JME.smiles();
1.2 albertel 72: opener.document.lonhomework.$smile_input.value = smiles;
73: SMILESECTION
74: }
75: my $jmesection;
76: if (defined($jme_input)) {
77: $jmesection=<<JMESECTION;
78: jmeFile = document.applets.JME.jmeFile();
79: opener.document.lonhomework.$jme_input.value = jmeFile;
80: JMESECTION
81: }
82:
1.14 albertel 83: if ($molecule) { $molecule='<param name="jme" value="'.$molecule.'" />'; }
1.1 albertel 84: my $body=<<CHEMPAGE;
85: <html>
86: <head>
87: <title>Molecule Editor</title>
1.47 albertel 88: <script type="text/javascript">
1.1 albertel 89: function submitSmiles() {
1.21 albertel 90: jmeFile = document.applets.JME.jmeFile();
91: if (jmeFile == "") {
1.1 albertel 92: alert("Nothing to submit");
93: } else {
1.21 albertel 94: $jmesection
1.2 albertel 95: $smilesection
1.1 albertel 96: window.close();
97: }
98: }
99: function openHelpWindow() {
1.2 albertel 100: window.open("/adm/jme/jme_help.html","","scrollbars=yes,resizable=yes,width=500,height=600");
1.1 albertel 101: }
102: </script>
103: </head>
104: <body bgcolor="#ffffff">
105: <center>
1.27 albertel 106: <applet code="JME.class" name="JME" archive="/adm/jme/JME.jar" width="440" height="390">
1.1 albertel 107: You have to enable Java and JavaScript on your machine.
1.12 albertel 108: $molecule
1.6 albertel 109: <param name="options" value="$options" />
1.1 albertel 110: </applet><br />
1.49 albertel 111: <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 112: <form>
1.47 albertel 113: <input type="button" name="submit" value="Insert Answer" onclick = "submitSmiles();" />
1.1 albertel 114: <br />
1.47 albertel 115: <input type="button" value=" Close " onclick = "window.close()" />
1.1 albertel 116:
1.47 albertel 117: <input type="button" value=" Help " onclick = "openHelpWindow()" />
1.1 albertel 118: </form>
119: </center>
120: </body>
121: </html>
122: CHEMPAGE
1.32 albertel 123: $body=&HTML::Entities::encode($body,'<>&"');
1.1 albertel 124: $body=~s/\n/ /g;
1.53 albertel 125: my $nothing=&Apache::lonhtmlcommon::javascript_nothing();
1.41 www 126: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
1.55 albertel 127: my $display=&mt('Draw Molecule');
128: if (defined($shown_text)) { $display=&mt($shown_text); }
1.1 albertel 129: my $result=<<CHEMINPUT;
1.55 albertel 130: <input type="button" value="$display" 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 131: CHEMINPUT
132: return $result;
133: }
134:
1.56 ! albertel 135: sub jme_img {
! 136: my ($jme,$smile,$width,$options)=@_;
! 137: my $id=&Apache::loncommon::get_cgi_id();
! 138: my $result='<img alt="'.$smile.'" src="/cgi-bin/convertjme.pl?'.$id.'"';
! 139: if ($options =~ /border/) { $result.= ' border="1"'; }
! 140: $result.=' />';
! 141: &Apache::lonnet::appenv('cgi.'.$id.'.JME' =>
! 142: &Apache::lonnet::escape($jme),
! 143: 'cgi.'.$id.'.PNG' => 1,
! 144: 'cgi.'.$id.'.WIDTH' => $width);
! 145: return $result;
! 146: }
! 147:
1.6 albertel 148: sub start_organicresponse {
1.1 albertel 149: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
150: my $result;
151: my $partid = $Apache::inputtags::part;
152: my $id = &Apache::response::start_response($parstack,$safeeval);
153: if ($target eq 'meta') {
1.28 albertel 154: $result=&Apache::response::meta_package_write('organicresponse');
1.1 albertel 155: } elsif ($target eq 'web') {
1.55 albertel 156: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
157: $safeeval);
158: if ( &Apache::response::show_answer() && $jmeanswer ne '') {
1.44 albertel 159: my $options=&Apache::lonxml::get_param('options',$parstack,
160: $safeeval);
161: my $width=&Apache::lonxml::get_param('width',$parstack,
162: $safeeval);
1.56 ! albertel 163: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
! 164: $safeeval);
! 165: $result.=&jme_img($jmeanswer,$answers[0],$width,$options);
1.1 albertel 166: } else {
1.44 albertel 167: my $molecule;
168: if (defined($Apache::lonhomework::history{"resource.$partid.$id.molecule"})) {
169: $molecule=$Apache::lonhomework::history{"resource.$partid.$id.molecule"};
170: } else {
171: $molecule=&Apache::lonxml::get_param('molecule',$parstack,
172: $safeeval);
173: }
174: my $options=&Apache::lonxml::get_param('options',$parstack,
175: $safeeval);
1.55 albertel 176: my $shown_text;
177: if (&Apache::response::show_answer()) {
178: $shown_text="Show Your Last Answer";
179: }
180: $result=&separate_jme_window("HWVAL_$id","MOLECULE_$id",$molecule,
181: $options,$shown_text);
1.44 albertel 182: $result.= '<input type="hidden" name="MOLECULE_'.$id.'" value="" />';
1.1 albertel 183: }
1.2 albertel 184: } elsif ($target eq 'edit') {
185: $result .=&Apache::edit::tag_start($target,$token);
1.12 albertel 186: my $options=&Apache::lonxml::get_param('options',$parstack,
187: $safeeval);
188: if ($options !~ /multipart/) { $options.=',multipart'; }
1.7 albertel 189: $result .='<nobr>'.
190: &Apache::edit::text_arg('Starting Molecule:','molecule',
191: $token,40);
1.2 albertel 192: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
193: $safeeval);
1.30 www 194: $result .=&separate_jme_window(undef,
1.2 albertel 195: &Apache::edit::html_element_name('molecule'),
1.12 albertel 196: $molecule,$options);
1.7 albertel 197: $result .='</nobr><br /><nobr>';
1.2 albertel 198: $result .=&Apache::edit::text_arg('Correct Answer:','answer',
199: $token,40);
200: $result .=&Apache::edit::hidden_arg('jmeanswer',$token);
201: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
202: $safeeval);
1.30 www 203: $result .=&separate_jme_window(
1.2 albertel 204: &Apache::edit::html_element_name('answer'),
205: &Apache::edit::html_element_name('jmeanswer'),
1.12 albertel 206: $jmeanswer,$options);
207: $result .='</nobr><br />';
208: $result .=&Apache::edit::checked_arg('Options:','options',
1.29 www 209: [ ['autoez','Auto E,Z stereochemistry'],
1.18 albertel 210: ['multipart','Multipart Structures'],
1.12 albertel 211: ['nostereo','No stereochemistry'],
212: ['reaction','Is a reaction'],
1.18 albertel 213: ['number','Able to number atoms'] ],
1.12 albertel 214: ,$token);
1.44 albertel 215: $result .=&Apache::edit::text_arg('Width of correct answer image:',
216: 'width',$token,10);
1.2 albertel 217: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
218: } elsif ($target eq 'modified') {
219: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
220: $safeeval,'molecule',
1.6 albertel 221: 'answer','jmeanswer',
1.44 albertel 222: 'options','width');
1.2 albertel 223: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.1 albertel 224: }
225: return $result;
226: }
227:
1.6 albertel 228: sub end_organicresponse {
1.1 albertel 229: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
230: my $result;
1.45 albertel 231: if ($target eq 'grade' && &Apache::response::submitted()) {
1.31 albertel 232: &Apache::response::setup_params($$tagstack[-1],$safeeval);
1.1 albertel 233: my $response = &Apache::response::getresponse();
234: if ( $response =~ /[^\s]/) {
235: my $partid = $Apache::inputtags::part;
236: my $id = $Apache::inputtags::response['-1'];
1.13 albertel 237: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
1.1 albertel 238: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
239: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
240: my $ad;
1.13 albertel 241: foreach my $answer (@answers) {
242: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
243: if ($response eq $answer) {
244: $ad='EXACT_ANS';
245: last;
246: } else {
247: $ad='INCORRECT';
248: }
1.1 albertel 249: }
1.42 albertel 250: if ($ad && $Apache::lonhomework::type eq 'survey') {
251: $ad='SUBMITTED';
252: }
1.1 albertel 253: &Apache::response::handle_previous(\%previous,$ad);
254: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
1.50 albertel 255: $Apache::lonhomework::results{"resource.$partid.$id.molecule"}=$env{"form.MOLECULE_$id"};
1.1 albertel 256: }
1.2 albertel 257: } elsif ($target eq "edit") {
258: $result.= &Apache::edit::tag_end($target,$token,'');
1.15 albertel 259: } elsif ($target eq 'answer') {
260: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
261: $safeeval);
262: $result.=&Apache::response::answer_header('organicresponse');
263: foreach my $answer (@answers) {
264: $result.=&Apache::response::answer_part('organicresponse',$answer);
265: }
266: $result.=&Apache::response::answer_footer('organicresponse');
1.1 albertel 267: }
268: &Apache::response::end_response;
269: return $result;
270: }
271:
1.6 albertel 272: sub start_organicstructure {
1.3 albertel 273: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
274: my $result;
275: if ($target eq 'web') {
276: my $width=&Apache::lonxml::get_param('width',$parstack,$safeeval);
277: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
1.12 albertel 278: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
1.23 albertel 279: my $id=&Apache::loncommon::get_cgi_id();
1.19 albertel 280: $result="<img src='/cgi-bin/convertjme.pl?$id'";
281: if ($options =~ /border/) { $result.= ' border="1"'; }
282: $result.=' />';
1.16 albertel 283: &Apache::lonnet::appenv(
284: 'cgi.'.$id.'.JME' => &Apache::lonnet::escape($molecule),
1.17 albertel 285: 'cgi.'.$id.'.PNG' => 1,
1.16 albertel 286: 'cgi.'.$id.'.WIDTH' => $width );
1.17 albertel 287: } elsif ($target eq 'tex') {
1.38 albertel 288: my $texwidth=&Apache::lonxml::get_param('texwidth',$parstack,$safeeval,undef,1);
1.17 albertel 289: if (!$texwidth) { $texwidth='90'; }
290: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
291: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
1.50 albertel 292: my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
1.17 albertel 293: '_'.time.'_'.$$.int(rand(1000)).'_organicstructure';
294: my $id=$filename;
295: &Apache::lonnet::appenv(
296: 'cgi.'.$id.'.JME' => &Apache::lonnet::escape($molecule),
297: 'cgi.'.$id.'.PS' => 1,
298: 'cgi.'.$id.'.WIDTH' => $texwidth );
299: $id=&Apache::lonnet::escape($id);
300: &Apache::lonxml::register_ssi("/cgi-bin/convertjme.pl?$id");
1.20 albertel 301: if ($options =~ /border/) { $result.= '\fbox{'; }
302: $result .= '\graphicspath{{/home/httpd/perl/tmp/}}\includegraphics[width='.$texwidth.' mm]{'.$filename.'.eps}';
303: if ($options =~ /border/) { $result.= '} '; }
1.3 albertel 304: } elsif ($target eq 'edit') {
305: $result .=&Apache::edit::tag_start($target,$token);
1.22 albertel 306: $result .=&Apache::edit::text_arg('Width (pixels):','width',$token,5);
307: $result .=&Apache::edit::text_arg('TeXwidth (mm):','texwidth',$token,5);
1.12 albertel 308: $result .='<nobr>';
1.3 albertel 309: $result .=&Apache::edit::text_arg('Molecule:','molecule',$token,40);
310: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
311: $safeeval);
1.12 albertel 312: my $options=&Apache::lonxml::get_param('options',$parstack,
313: $safeeval);
314: if ($options !~ /reaction/) {
315: $options.= ',multipart,number';
316: }
317:
1.30 www 318: $result .=&separate_jme_window(undef,
1.12 albertel 319: &Apache::edit::html_element_name('molecule'),
320: $molecule,$options);
321: $result.="</nobr><br />";
322: $result .=&Apache::edit::checked_arg('Options:','options',
1.18 albertel 323: [ ['reaction','Is a reaction'],
1.12 albertel 324: ['border','Draw a border'] ],
325: $token);
1.24 albertel 326: $result .=&Apache::edit::end_row();
1.3 albertel 327: } elsif ($target eq 'modified') {
328: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
329: $safeeval,'molecule',
1.22 albertel 330: 'width','texwidth',
331: 'options');
1.3 albertel 332: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
333: }
334: return $result;
1.1 albertel 335: }
336:
1.6 albertel 337: sub end_organicstructure {
1.3 albertel 338: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
339: my $result;
340: if ($target eq "edit") {
341: $result.= &Apache::edit::tag_end($target,$token,'');
342: }
1.4 albertel 343: return $result;
344: }
345:
1.9 albertel 346: sub edit_reaction_button {
1.11 albertel 347: my ($id,$field,$reaction)=@_;
1.10 albertel 348: my $id_es=&Apache::lonnet::escape($id);
349: my $field_es=&Apache::lonnet::escape($field);
1.11 albertel 350: my $reaction_es=&Apache::lonnet::escape($reaction);
1.41 www 351: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
1.9 albertel 352: my $result=<<EDITREACTION;
1.10 albertel 353: <script type="text/javascript">
1.47 albertel 354: // <!--
1.10 albertel 355: function create_reaction_window_${id}_${field} () {
356: editor=window.open('','','width=500,height=270,scrollbars=no,resizable=yes');
1.41 www 357: editor.$docopen;
1.37 albertel 358: 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=$field_es" name="editor" scrolling="no" /> </frameset> </html>');
1.10 albertel 359: }
1.47 albertel 360: // -->
1.10 albertel 361: </script>
1.47 albertel 362: <input type='button' value='Edit Answer' onclick="javascript:create_reaction_window_${id}_${field}();void(0);" />
1.9 albertel 363: EDITREACTION
364: return $result;
365: }
366:
1.4 albertel 367: sub start_reactionresponse {
368: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
369: my $result;
370: my $id = &Apache::response::start_response($parstack,$safeeval);
1.10 albertel 371: if ($target eq 'meta') {
1.28 albertel 372: $result=&Apache::response::meta_package_write('reactionresponse');
1.10 albertel 373: } elsif ($target eq 'web') {
1.11 albertel 374: my $partid = $Apache::inputtags::part;
375: my $id = $Apache::inputtags::response['-1'];
376: my $reaction=$Apache::lonhomework::history{"resource.$partid.$id.submission"};
1.35 albertel 377: if ($reaction eq '') { $reaction=&Apache::lonxml::get_param('initial',$parstack,$safeeval); }
1.33 albertel 378: my $status=$Apache::inputtags::status['-1'];
379: if ($status eq 'CAN_ANSWER') {
380: $result.=&edit_reaction_button($id,"HWVAL_$id",$reaction);
381: }
382: if ( &Apache::response::show_answer() ) {
383: my $ans=&Apache::lonxml::get_param('answer',$parstack,$safeeval);
1.51 albertel 384: if (!$Apache::lonxml::default_homework_loaded) {
385: &Apache::lonxml::default_homework_load($safeeval);
386: }
387: @Apache::scripttag::parser_env = @_;
388: $Apache::inputtags::answertxt{$id}=&Apache::run::run("return &chemparse(q\0$ans\0);",$safeeval);
1.33 albertel 389: }
1.4 albertel 390: } elsif ($target eq "edit") {
1.9 albertel 391: $result .=&Apache::edit::tag_start($target,$token);
392: my $answer=&Apache::lonxml::get_param('answer',$parstack,
393: $safeeval);
1.10 albertel 394: $result .='<nobr>'.
395: &Apache::edit::text_arg('Answer:','answer',$token,40);
396: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('answer'),$answer).'</nobr>';
1.35 albertel 397: my $initial=&Apache::lonxml::get_param('initial',$parstack,$safeeval);
398: $result.='<nobr>'.
1.43 albertel 399: &Apache::edit::text_arg('Initial Reaction:','initial',$token,40);
1.35 albertel 400: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('initial'),$initial).'</nobr>';
1.10 albertel 401:
1.9 albertel 402: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
1.10 albertel 403: } elsif ($target eq 'modified') {
404: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
1.35 albertel 405: $safeeval,'answer',
406: 'initial');
1.10 albertel 407: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
1.4 albertel 408: }
409: return $result;
410: }
411:
412: sub end_reactionresponse {
413: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
414: my $result;
1.45 albertel 415: if ($target eq 'grade' && &Apache::response::submitted()) {
1.31 albertel 416: &Apache::response::setup_params($$tagstack[-1],$safeeval);
1.10 albertel 417: my $response = &Apache::response::getresponse();
418: if ( $response =~ /[^\s]/) {
419: my $partid = $Apache::inputtags::part;
420: my $id = $Apache::inputtags::response['-1'];
1.15 albertel 421: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
1.10 albertel 422: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
423: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
424: my $ad;
1.13 albertel 425: foreach my $answer (@answers) {
426: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
1.34 albertel 427: if (&chem_standard_order($response) eq
428: &chem_standard_order($answer)) {
1.13 albertel 429: $ad='EXACT_ANS';
430: } else {
431: $ad='INCORRECT';
432: }
1.10 albertel 433: }
1.42 albertel 434: if ($ad && $Apache::lonhomework::type eq 'survey') {
435: $ad='SUBMITTED';
436: }
1.10 albertel 437: &Apache::response::handle_previous(\%previous,$ad);
438: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
439: }
440: } elsif ($target eq "edit") {
1.4 albertel 441: $result.= &Apache::edit::tag_end($target,$token,'');
1.15 albertel 442: } elsif ($target eq 'answer') {
443: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
444: $safeeval);
445: $result.=&Apache::response::answer_header('reactionresponse');
446: foreach my $answer (@answers) {
447: $result.=&Apache::response::answer_part('reactionresponse',
448: $answer);
449: }
450: $result.=&Apache::response::answer_footer('reactionresponse');
1.4 albertel 451: }
452: &Apache::response::end_response;
1.3 albertel 453: return $result;
1.1 albertel 454: }
455:
1.46 albertel 456: sub start_chem {
457: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
458: my $result = '';
1.48 albertel 459: my $inside = &Apache::lonxml::get_all_text_unbalanced("/chem",$parser);
1.46 albertel 460: if ($target eq 'tex' || $target eq 'web') {
1.48 albertel 461: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
462: if (!$Apache::lonxml::default_homework_loaded) {
463: &Apache::lonxml::default_homework_load($safeeval);
464: }
465: @Apache::scripttag::parser_env = @_;
466: $result=&Apache::run::run("return &chemparse(q\0$inside\0);",$safeeval);
1.46 albertel 467: }
468: return $result;
469: }
470:
471: sub end_chem {
472: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
473: my $result = '';
474: return $result;
475: }
476:
1.1 albertel 477: 1;
478: __END__
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