1: # The LearningOnline Network with CAPA
2: # chemical equation style response
3: #
4: # $Id: chemresponse.pm,v 1.66 2006/05/30 12:45:36 www 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 $start_page =
113: &Apache::loncommon::start_page('Molecule Editor',$js,
114: {'only_body' => 1,
115: 'bgcolor' => '#FFFFFF',});
116: my $end_page =
117: &Apache::loncommon::end_page();
118:
119: my $body=<<CHEMPAGE;
120: $start_page
121: <center>
122: <form>
123: <table width="440"><tr>
124: <td></td>
125: <td align="right">
126: <select onchange="javascript:substituent(options[selectedIndex].text)">
127: <option>Select substituent</option>
128: <option>-C(=O)OH</option>
129: <option>-C(=O)OMe</option>
130: <option>-OC(=O)Me</option>
131: <option>-CMe3</option>
132: <option>-CF3</option>
133: <option>-CCl3</option>
134: <option>-NO2</option>
135: <option>-SO2-NH2</option>
136: <option>-NH-SO2-Me</option>
137: <option>-NMe2</option>
138: <option>-C#N</option>
139: <option>-C#C-Me</option>
140: <option>-C#CH</option>
141: </select>
142: </td></tr>
143: </table>
144: <applet code="JME.class" name="JME" archive="/adm/jme/JME.jar" width="440" height="390" mayscript>
145: You have to enable Java and JavaScript on your machine.
146: $molecule
147: <param name="options" value="$options" />
148: </applet><br />
149: <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>
150: <br />
151: $insert_answer
152: <br />
153: <input type="button" value=" Close " onclick = "javascript:window.close()" />
154:
155: <input type="button" value=" Help " onclick = "javascript:openHelpWindow()" />
156: </form>
157: </center>
158: $end_page
159: CHEMPAGE
160:
161: $body=&HTML::Entities::encode($body,'<>&"');
162: $body=~s/\n/ /g;
163: my $nothing=&Apache::lonhtmlcommon::javascript_nothing();
164: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
165: my $display=&mt('Draw Molecule');
166: if (defined($shown_text)) { $display=&mt($shown_text); }
167: my $result=<<CHEMINPUT;
168: <input type="button" value="$display" onclick="javascript:editor=window.open($nothing,'jmeedit','width=500,height=500,menubar=no,scrollbars=no,resizable=yes');editor.$docopen;editor.document.write('$body');editor.document.close();editor.focus()" />
169: CHEMINPUT
170: return $result;
171: }
172:
173: sub jme_img {
174: my ($jme,$smile,$width,$options)=@_;
175: my $id=&Apache::loncommon::get_cgi_id();
176: my $result='<img alt="'.$smile.'" src="/cgi-bin/convertjme.pl?'.$id.'"';
177: if ($options =~ /border/) { $result.= ' border="1"'; }
178: $result.=' />';
179: &Apache::lonnet::appenv('cgi.'.$id.'.JME' =>
180: &escape($jme),
181: 'cgi.'.$id.'.PNG' => 1,
182: 'cgi.'.$id.'.WIDTH' => $width);
183: return $result;
184: }
185:
186: sub start_organicresponse {
187: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
188: my $result;
189: my $partid = $Apache::inputtags::part;
190: my $id = &Apache::response::start_response($parstack,$safeeval);
191: if ($target eq 'meta') {
192: $result=&Apache::response::meta_package_write('organicresponse');
193: } elsif ($target eq 'web') {
194: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
195: $safeeval);
196: if ( &Apache::response::show_answer() && $jmeanswer ne '') {
197: my $options=&Apache::lonxml::get_param('options',$parstack,
198: $safeeval);
199: my $width=&Apache::lonxml::get_param('width',$parstack,
200: $safeeval);
201: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
202: $safeeval);
203: $result.=&jme_img($jmeanswer,$answers[0],$width,$options);
204: } else {
205: my $molecule;
206: if (defined($Apache::lonhomework::history{"resource.$partid.$id.molecule"})) {
207: $molecule=$Apache::lonhomework::history{"resource.$partid.$id.molecule"};
208: } else {
209: $molecule=&Apache::lonxml::get_param('molecule',$parstack,
210: $safeeval);
211: }
212: my $options=&Apache::lonxml::get_param('options',$parstack,
213: $safeeval);
214: my $shown_text;
215: if (&Apache::response::show_answer()) {
216: $shown_text="Show Your Last Answer";
217: }
218: $result=&separate_jme_window("HWVAL_$id","MOLECULE_$id",$molecule,
219: $options,$shown_text);
220: $result.= '<input type="hidden" name="MOLECULE_'.$id.'" value="" />';
221: }
222: } elsif ($target eq 'edit') {
223: $result .=&Apache::edit::tag_start($target,$token);
224: my $options=&Apache::lonxml::get_param('options',$parstack,
225: $safeeval);
226: if ($options !~ /multipart/) { $options.=',multipart'; }
227: $result .='<nobr>'.
228: &Apache::edit::text_arg('Starting Molecule:','molecule',
229: $token,40);
230: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
231: $safeeval);
232: $result .=&separate_jme_window(undef,
233: &Apache::edit::html_element_name('molecule'),
234: $molecule,$options);
235: $result .='</nobr><br /><nobr>';
236: $result .=&Apache::edit::text_arg('Correct Answer:','answer',
237: $token,40);
238: $result .=&Apache::edit::hidden_arg('jmeanswer',$token);
239: my $jmeanswer=&Apache::lonxml::get_param('jmeanswer',$parstack,
240: $safeeval);
241: $result .=&separate_jme_window(
242: &Apache::edit::html_element_name('answer'),
243: &Apache::edit::html_element_name('jmeanswer'),
244: $jmeanswer,$options);
245: $result .='</nobr><br />';
246: $result .=&Apache::edit::checked_arg('Options:','options',
247: [ ['autoez','Auto E,Z stereochemistry'],
248: ['multipart','Multipart Structures'],
249: ['nostereo','No stereochemistry'],
250: ['reaction','Is a reaction'],
251: ['number','Able to number atoms'] ],
252: ,$token);
253: $result .=&Apache::edit::text_arg('Width of correct answer image:',
254: 'width',$token,10);
255: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
256: } elsif ($target eq 'modified') {
257: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
258: $safeeval,'molecule',
259: 'answer','jmeanswer',
260: 'options','width');
261: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
262: }
263:
264: return $result;
265: }
266:
267: sub end_organicresponse {
268: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
269: my $result;
270:
271: my $partid = $Apache::inputtags::part;
272: my $id = $Apache::inputtags::response['-1'];
273:
274: if ($target eq 'grade'
275: && &Apache::response::submitted()
276: && $Apache::lonhomework::type eq 'exam') {
277:
278: &Apache::response::scored_response($partid,$id);
279:
280: } elsif ($target eq 'grade'
281: && &Apache::response::submitted()
282: && $Apache::lonhomework::type ne 'exam') {
283:
284: &Apache::response::setup_params($$tagstack[-1],$safeeval);
285: my $response = &Apache::response::getresponse();
286: if ( $response =~ /[^\s]/) {
287: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
288: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
289: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
290: my $ad;
291: foreach my $answer (@answers) {
292: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
293: if ($response eq $answer) {
294: $ad='EXACT_ANS';
295: last;
296: } else {
297: $ad='INCORRECT';
298: }
299: }
300: if ($ad && $Apache::lonhomework::type eq 'survey') {
301: $ad='SUBMITTED';
302: }
303: &Apache::response::handle_previous(\%previous,$ad);
304: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
305: $Apache::lonhomework::results{"resource.$partid.$id.molecule"}=$env{"form.MOLECULE_$id"};
306: }
307: } elsif ($target eq "edit") {
308: $result.= &Apache::edit::tag_end($target,$token,'');
309: } elsif ($target eq 'answer') {
310: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
311: $safeeval);
312: $result.=&Apache::response::answer_header('organicresponse');
313: foreach my $answer (@answers) {
314: $result.=&Apache::response::answer_part('organicresponse',$answer);
315: }
316: $result.=&Apache::response::answer_footer('organicresponse');
317: }
318:
319: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
320: $target eq 'tex' || $target eq 'analyze') {
321: &Apache::lonxml::increment_counter(&Apache::response::repetition());
322: }
323: &Apache::response::end_response();
324: return $result;
325: }
326:
327: sub start_organicstructure {
328: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
329: my $result;
330: if ($target eq 'web') {
331: my $width=&Apache::lonxml::get_param('width',$parstack,$safeeval);
332: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
333: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
334: my $id=&Apache::loncommon::get_cgi_id();
335: $result="<img src='/cgi-bin/convertjme.pl?$id'";
336: if ($options =~ /border/) { $result.= ' border="1"'; }
337: $result.=' />';
338: &Apache::lonnet::appenv(
339: 'cgi.'.$id.'.JME' => &escape($molecule),
340: 'cgi.'.$id.'.PNG' => 1,
341: 'cgi.'.$id.'.WIDTH' => $width );
342: } elsif ($target eq 'tex') {
343: my $texwidth=&Apache::lonxml::get_param('texwidth',$parstack,$safeeval,undef,1);
344: my $webwidth=&Apache::lonxml::get_param('width', $parstack, $safeeval);
345: my $webheight=&Apache::lonxml::get_param('height', $parstack, $safeeval);
346: if (!$webheight) { $webheight = $webwidth; }
347: if (!$texwidth) { $texwidth='90'; }
348: $result = "%DYNAMICIMAGE:$webwidth:$webheight:$texwidth\n";
349: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,$safeeval);
350: my $options=&Apache::lonxml::get_param('options',$parstack,$safeeval);
351: my $filename = $env{'user.name'}.'_'.$env{'user.domain'}.
352: '_'.time.'_'.$$.int(rand(1000)).'_organicstructure';
353: my $id=$filename;
354: &Apache::lonnet::appenv(
355: 'cgi.'.$id.'.JME' => &escape($molecule),
356: 'cgi.'.$id.'.PS' => 1,
357: 'cgi.'.$id.'.WIDTH' => $texwidth );
358: $id=&escape($id);
359: &Apache::lonxml::register_ssi("/cgi-bin/convertjme.pl?$id");
360: if ($options =~ /border/) { $result.= '\fbox{'; }
361: $result .= '\graphicspath{{/home/httpd/perl/tmp/}}\includegraphics[width='.$texwidth.' mm]{'.$filename.'.eps}';
362: if ($options =~ /border/) { $result.= '} '; }
363: } elsif ($target eq 'edit') {
364: $result .=&Apache::edit::tag_start($target,$token);
365: $result .=&Apache::edit::text_arg('Width (pixels):','width',$token,5);
366: $result .=&Apache::edit::text_arg('TeXwidth (mm):','texwidth',$token,5);
367: $result .='<nobr>';
368: $result .=&Apache::edit::text_arg('Molecule:','molecule',$token,40);
369: my $molecule=&Apache::lonxml::get_param('molecule',$parstack,
370: $safeeval);
371: my $options=&Apache::lonxml::get_param('options',$parstack,
372: $safeeval);
373: if ($options !~ /reaction/) {
374: $options.= ',multipart,number';
375: }
376:
377: $result .=&separate_jme_window(undef,
378: &Apache::edit::html_element_name('molecule'),
379: $molecule,$options);
380: $result.="</nobr><br />";
381: $result .=&Apache::edit::checked_arg('Options:','options',
382: [ ['reaction','Is a reaction'],
383: ['border','Draw a border'] ],
384: $token);
385: $result .=&Apache::edit::end_row();
386: } elsif ($target eq 'modified') {
387: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
388: $safeeval,'molecule',
389: 'width','texwidth',
390: 'options');
391: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
392: }
393: return $result;
394: }
395:
396: sub end_organicstructure {
397: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
398: my $result;
399: if ($target eq "edit") {
400: $result.= &Apache::edit::tag_end($target,$token,'');
401: }
402: return $result;
403: }
404:
405: sub edit_reaction_button {
406: my ($id,$field,$reaction)=@_;
407: my $id_es=&escape($id);
408: my $field_es=&escape($field);
409: my $reaction_es=&escape($reaction);
410: my $docopen=&Apache::lonhtmlcommon::javascript_docopen();
411: my $start_page =
412: &Apache::loncommon::start_page('LON-CAPA Reaction Editor',undef,
413: {'frameset' => 1,
414: 'js_ready' => 1,
415: 'add_entries' => {
416: 'rows' => "30%",
417: 'border' => "0",}},);
418: my $end_page =
419: &Apache::loncommon::end_page({'frameset' => 1,
420: 'js_ready' => 1});
421: my $result=<<EDITREACTION;
422: <script type="text/javascript">
423: // <!--
424: function create_reaction_window_${id}_${field} () {
425: editor=window.open('','','width=500,height=270,scrollbars=no,resizable=yes');
426: editor.$docopen;
427: 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" /> $end_page');
428: }
429: // -->
430: </script>
431: <input type='button' value='Edit Answer' onclick="javascript:create_reaction_window_${id}_${field}();void(0);" />
432: EDITREACTION
433: return $result;
434: }
435:
436: sub start_reactionresponse {
437: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
438: my $result;
439: my $id = &Apache::response::start_response($parstack,$safeeval);
440: if ($target eq 'meta') {
441: $result=&Apache::response::meta_package_write('reactionresponse');
442: } elsif ($target eq 'web') {
443: my $partid = $Apache::inputtags::part;
444: my $id = $Apache::inputtags::response['-1'];
445: my $reaction=$Apache::lonhomework::history{"resource.$partid.$id.submission"};
446: if ($reaction eq '') { $reaction=&Apache::lonxml::get_param('initial',$parstack,$safeeval); }
447: my $status=$Apache::inputtags::status['-1'];
448: if ($status eq 'CAN_ANSWER') {
449: $result.=&edit_reaction_button($id,"HWVAL_$id",$reaction);
450: }
451: if ( &Apache::response::show_answer() ) {
452: my $ans=&Apache::lonxml::get_param('answer',$parstack,$safeeval);
453: if (!$Apache::lonxml::default_homework_loaded) {
454: &Apache::lonxml::default_homework_load($safeeval);
455: }
456: @Apache::scripttag::parser_env = @_;
457: $Apache::inputtags::answertxt{$id}=&Apache::run::run("return &chemparse(q\0$ans\0);",$safeeval);
458: }
459: } elsif ($target eq "edit") {
460: $result .=&Apache::edit::tag_start($target,$token);
461: my $answer=&Apache::lonxml::get_param('answer',$parstack,
462: $safeeval);
463: $result .='<nobr>'.
464: &Apache::edit::text_arg('Answer:','answer',$token,40);
465: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('answer'),$answer).'</nobr>';
466: my $initial=&Apache::lonxml::get_param('initial',$parstack,$safeeval);
467: $result.='<nobr>'.
468: &Apache::edit::text_arg('Initial Reaction:','initial',$token,40);
469: $result .=&edit_reaction_button($id,&Apache::edit::html_element_name('initial'),$initial).'</nobr>';
470:
471: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
472: } elsif ($target eq 'modified') {
473: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
474: $safeeval,'answer',
475: 'initial');
476: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
477: }
478: return $result;
479: }
480:
481: sub end_reactionresponse {
482: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
483: my $result;
484:
485: my $partid = $Apache::inputtags::part;
486: my $id = $Apache::inputtags::response['-1'];
487:
488: if ($target eq 'grade'
489: && &Apache::response::submitted()
490: && $Apache::lonhomework::type eq 'exam') {
491:
492: &Apache::response::scored_response($partid,$id);
493:
494: } elsif ($target eq 'grade'
495: && &Apache::response::submitted()
496: && $Apache::lonhomework::type ne 'exam') {
497:
498: &Apache::response::setup_params($$tagstack[-1],$safeeval);
499: my $response = &Apache::response::getresponse();
500: if ( $response =~ /[^\s]/) {
501: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,$safeeval);
502: my %previous = &Apache::response::check_for_previous($response,$partid,$id);
503: $Apache::lonhomework::results{"resource.$partid.$id.submission"}=$response;
504: my $ad;
505: foreach my $answer (@answers) {
506: &Apache::lonxml::debug("submitted a $response for $answer<br \>\n");
507: if (&chem_standard_order($response) eq
508: &chem_standard_order($answer)) {
509: $ad='EXACT_ANS';
510: } else {
511: $ad='INCORRECT';
512: }
513: }
514: if ($ad && $Apache::lonhomework::type eq 'survey') {
515: $ad='SUBMITTED';
516: }
517: &Apache::response::handle_previous(\%previous,$ad);
518: $Apache::lonhomework::results{"resource.$partid.$id.awarddetail"}=$ad;
519: }
520: } elsif ($target eq "edit") {
521: $result.= &Apache::edit::tag_end($target,$token,'');
522: } elsif ($target eq 'answer') {
523: my (@answers)=&Apache::lonxml::get_param_var('answer',$parstack,
524: $safeeval);
525: $result.=&Apache::response::answer_header('reactionresponse');
526: foreach my $answer (@answers) {
527: $result.=&Apache::response::answer_part('reactionresponse',
528: $answer);
529: }
530: $result.=&Apache::response::answer_footer('reactionresponse');
531: }
532:
533: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
534: $target eq 'tex' || $target eq 'analyze') {
535: &Apache::lonxml::increment_counter(&Apache::response::repetition());
536: }
537: &Apache::response::end_response();
538: return $result;
539: }
540:
541: sub start_chem {
542: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
543: my $result = '';
544: my $inside = &Apache::lonxml::get_all_text_unbalanced("/chem",$parser);
545: if ($target eq 'tex' || $target eq 'web') {
546: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
547: if (!$Apache::lonxml::default_homework_loaded) {
548: &Apache::lonxml::default_homework_load($safeeval);
549: }
550: @Apache::scripttag::parser_env = @_;
551: $result=&Apache::run::run("return &chemparse(q\0$inside\0);",$safeeval);
552: }
553: return $result;
554: }
555:
556: sub end_chem {
557: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
558: my $result = '';
559: return $result;
560: }
561:
562: 1;
563: __END__
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