1: # The LearningOnline Network with CAPA
2: # <script> definiton
3: #
4: # $Id: scripttag.pm,v 1.135 2006/03/23 23:47:56 albertel 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::scripttag;
30:
31: use strict;
32: use Apache::lonnet;
33: use Apache::style;
34:
35: #Globals
36: # this used to pass around the standard callsub arguments to a tag func
37: # so xmlparse can reenter the inner_xmlparse loop.
38:
39: @Apache::scripttag::parser_env = ();
40: BEGIN {
41: &Apache::lonxml::register('Apache::scripttag',
42: ('script','scriptlib','parserlib','import',
43: 'window','display','storetc','physnet',
44: 'standalone','comment','num','parse','algebra',
45: 'LONCAPA_INTERNAL_TURN_STYLE_ON',
46: 'LONCAPA_INTERNAL_TURN_STYLE_OFF',
47: 'LONCAPA_INTERNAL_LONHTTPD_PORT'));
48: }
49:
50: sub start_LONCAPA_INTERNAL_TURN_STYLE_ON {
51: $Apache::lonxml::usestyle=1;
52: $Apache::lonxml::style_values='';
53: return ('','no');
54: }
55:
56: sub end_LONCAPA_INTERNAL_TURN_STYLE_ON {
57: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
58: my $end=&Apache::lonxml::get_param('end',$parstack,$safeeval);
59: if (defined($end)) {
60: &Apache::lonxml::end_tag($tagstack,$parstack,$token);
61: }
62: return ('','no');
63: }
64:
65: sub start_LONCAPA_INTERNAL_TURN_STYLE_OFF {
66: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
67: $Apache::lonxml::usestyle=0;
68: my $end=&Apache::lonxml::get_param('end',$parstack,$safeeval);
69: if (!$end) {
70: $Apache::lonxml::style_values=$$parstack[-1];
71: $Apache::lonxml::style_end_values=$$parstack[-1];
72: } else {
73: $Apache::lonxml::style_values=$Apache::lonxml::style_end_values;
74: $Apache::lonxml::style_end_values='';
75: }
76: return ('','no');
77: }
78:
79: sub end_LONCAPA_INTERNAL_TURN_STYLE_OFF {
80: return ('','no');
81: }
82:
83: sub start_LONCAPA_INTERNAL_LONHTTPD_PORT {
84: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
85: if ($target eq 'web') {
86: my $lonhttpdPort=$Apache::lonnet::perlvar{'lonhttpdPort'};
87: if (!defined($lonhttpdPort)) { $lonhttpdPort='8080'; }
88: return '<script type="text/javascript">var lonhttpdport=\''.
89: $lonhttpdPort.'\';</script>';
90: }
91: return ('','no');
92: }
93:
94: sub end_LONCAPA_INTERNAL_LONHTTPD_PORT {
95: return ('','no');
96: }
97:
98: sub start_script {
99: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
100: @Apache::scripttag::parser_env = @_;
101: my $result='';
102: my $type= &Apache::lonxml::get_param('type',$parstack,$safeeval);
103: &Apache::lonxml::debug("found type of $type");
104: if ($type eq "loncapa/perl") {
105: if ( $target eq "modified" ) {
106: $result=$token->[4].&Apache::edit::modifiedfield('/script',$parser);
107: } elsif ( $target eq 'web' || $target eq 'tex' ||
108: $target eq 'grade' || $target eq 'webgrade' ||
109: $target eq 'answer' || $target eq 'analyze' ) {
110: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
111: if (!$Apache::lonxml::default_homework_loaded) {
112: &Apache::lonxml::default_homework_load($safeeval);
113: }
114: &Apache::run::run($bodytext,$safeeval);
115: if (($target eq 'answer') &&
116: ($env{'form.answer_output_mode'} ne 'tex') &&
117: ($Apache::lonhomework::viewgrades == 'F')) {
118: $Apache::lonxml::evaluate--;
119: my (undef,undef,$udom,$uname)=&Apache::lonxml::whichuser();
120: my $windowopen=&Apache::lonhtmlcommon::javascript_docopen();
121: my $start_page =
122: &Apache::loncommon::start_page('Script Vars', undef,
123: {'only_body' => 1,
124: 'bgcolor' => '#FFFFFF',
125: 'js_ready' => 1,});
126: my $end_page =
127: &Apache::loncommon::end_page({'js_ready' => 1,});
128:
129: $result.="<script type=\"text/javascript\">
130: // <![CDATA[
131: function LONCAPA_scriptvars_".$uname."_".$udom."_"."$Apache::lonxml::curdepth() {newWindow=open('','new_W','width=500,height=500,scrollbars=1,resizable=yes');newWindow.$windowopen;newWindow.document.writeln('$start_page<pre>";
132: my $listing=&Apache::run::dump($target,$safeeval);
133: $listing=~s/\\/\\\\/g;
134: $listing=~s/\'/\\\'/g;
135: $result.=$listing;
136: $result.= "</pre>$end_page');newWindow.document.close();newWindow.focus()}
137: // ]]>
138: </script><a href=\"javascript:LONCAPA_scriptvars_".$uname."_".$udom."_$Apache::lonxml::curdepth();void(0);\">Script Vars</a><br />";
139: }
140: } elsif ($target eq "edit" ) {
141: #&Apache::run::run($bodytext,$safeeval);
142: #$result="<br /> <$token->[1]> output: <br />$bodytext<br />Source:<br />";
143: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
144: $result=&Apache::edit::tag_start($target,$token,'Script');
145: $result.=&Apache::edit::editfield($token->[1],$bodytext,'',80,4);
146: } elsif ($target eq 'meta') {
147: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
148: }
149: } else {
150: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
151: if ($target ne "meta" && $target ne 'tex') {
152: $result = $token->[4];
153: $result.=$bodytext;
154: }
155: }
156: return $result;
157: }
158:
159: sub end_script {
160: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
161: if ( $target eq "meta" ) { return ''; }
162: my $type = &Apache::lonxml::get_param('type',$parstack,$safeeval);
163: my $result='';
164: #other script blocks need to survive
165: if ($type ne "loncapa/perl" && $target ne 'tex') {
166: return $token->[2];
167: } elsif ($target eq 'edit' ) {
168: return &Apache::edit::end_table();
169: } elsif ($target eq 'answer') {
170: $Apache::lonxml::evaluate++;
171: }
172: return '';
173: }
174:
175: sub start_display {
176: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
177: @Apache::scripttag::parser_env = @_;
178: my $result;
179:
180: if ( $target eq "modified" ) {
181: $result=$token->[4].&Apache::edit::modifiedfield("/display",$parser);
182: } elsif ( $target eq 'web' || $target eq 'tex' ||
183: $target eq 'grade' || $target eq 'webgrade' ||
184: $target eq 'answer' || $target eq 'analyze') {
185: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/display",$parser);
186: if (!$Apache::lonxml::default_homework_loaded) {
187: &Apache::lonxml::default_homework_load($safeeval);
188: }
189: $result=&Apache::run::run($bodytext,$safeeval);
190: if ($target eq 'grade' || $target eq 'answer' ||
191: $target eq 'analyze') {
192: # grade/answer/analyxe should produce no output but if we
193: # are redirecting, the redirecter should know what to do
194: # with the output
195: if (!$Apache::lonxml::redirection) { $result=''; }
196: }
197: $Apache::lonxml::post_evaluate=0;
198: } elsif ($target eq "edit" ) {
199: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/display",$parser);
200: #$result =
201: # "<br /> <$token->[1]> output: <br />$bodytext<br />Source:<br />";
202: #$result.=&Apache::edit::editfield($token->[1],$bodytext,'',40,1);
203: $result=&Apache::edit::tag_start($target,$token,'Script With Display');
204: $result.=&Apache::edit::editfield($token->[1],$bodytext,'',80,1)
205: } elsif ($target eq 'meta') {
206: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/display",$parser);
207: }
208: return $result;
209: }
210:
211: sub end_display {
212: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
213: if ($target eq 'edit' ) { return &Apache::edit::end_table(); }
214: return '';
215: }
216:
217: sub start_scriptlib {
218: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
219: my $bodytext;
220: my $result ='';
221: my $error='';
222:
223: if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
224: $target eq 'meta' || $target eq 'edit' || $target eq 'answer' ||
225: $target eq 'analyze') {
226: $bodytext=$$parser[$#$parser]->get_text("/scriptlib");
227: $bodytext=&Apache::run::evaluate($bodytext,$safeeval,
228: $$parstack[$#$parstack]);
229: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],
230: $bodytext);
231: my $script=&Apache::lonnet::getfile($location);
232: if ($script == -1) {
233: if ($target eq 'edit') {
234: $error='</tr><tr><td>Errors</td><td colspan="2"><b> Unable to find <i>'.$location.'</i></b></td>'."\n";
235: } else {
236: &Apache::lonxml::error("<b> Unable to find <i>$location</i> for scriptlib</b>");
237: return "";
238: }
239: }
240: &Apache::run::run($script,$safeeval);
241: #&Apache::lonxml::debug("ran $bodytext:<br />".&Apache::lonnet::getfile($bodytext)."<br />");
242: }
243: if ($target eq "edit" ) {
244: $result=
245: &Apache::edit::tag_start($target,$token,'New Script Functions').
246: &Apache::edit::editline($token->[1],$bodytext,'scriptlib',40).
247: &Apache::edit::browse(undef,'textnode').
248: $error.'</td></tr>'.
249: &Apache::edit::end_table();
250: }
251: if ($target eq "modified" ) {
252: $result=$token->[4].&Apache::edit::modifiedfield("/scriptlib",$parser);
253: }
254: return $result;
255: }
256:
257: sub end_scriptlib {
258: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
259: my @result;
260: if ($target eq "edit" ) { $result[1]='no'; }
261: return @result;
262: }
263:
264: sub start_parserlib {
265: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
266: my $bodytext;
267: my $result ="";
268: my $error='';
269: if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
270: $target eq 'meta' || $target eq 'edit' || $target eq 'answer' ||
271: $target eq 'analyze') {
272: $bodytext=$$parser[$#$parser]->get_text("/parserlib");
273: $bodytext=&Apache::run::evaluate($bodytext,$safeeval,
274: $$parstack[$#$parstack]);
275: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],
276: $bodytext);
277: my $styletext=&Apache::lonnet::getfile($location);
278: #&Apache::lonxml::debug("found :$bodytext: in :$location: with :$styletext:");
279: if ($styletext == -1) {
280: if ($target eq 'edit') {
281: $error='</tr><tr><td>Errors</td><td colspan="2"><b> Unable to find <i>'.$location.'</i></b></td>'."\n";
282: } else {
283: &Apache::lonxml::error("<b> Unable to find <i>$location</i> for parserlib</b>");
284: return "";
285: }
286: }
287: %$style = ( %$style , &Apache::style::styleparser($target,$styletext));
288: }
289: if ($target eq "edit" ) {
290: $result=
291: &Apache::edit::tag_start($target,$token,'New Tag Definitions').
292: &Apache::edit::editline($token->[1],$bodytext,'',40).
293: $error.'</td></tr>'.
294: &Apache::edit::end_table();
295: }
296: if ($target eq "modified" ) {
297: $result=$token->[4].&Apache::edit::modifiedfield("/parserlib",$parser);
298: }
299: return $result;
300: }
301:
302: sub end_parserlib {
303: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
304: my @result;
305: if ($target eq "edit" ) { $result[1]='no'; }
306: return @result;
307: }
308:
309: sub start_window {
310: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
311: my $result = '';
312: if ($target eq 'web') {
313: &Apache::lonxml::startredirection;
314: } elsif ($target eq 'tex') {
315: $result = '\unskip\footnote{';
316: } elsif ($target eq 'edit') {
317: $result.=&Apache::edit::tag_start($target,$token);
318: $result.=&Apache::edit::text_arg('Text of Link:','linktext',$token,70);
319: $result.=&Apache::edit::text_arg('Height:','height',$token,5);
320: $result.=&Apache::edit::text_arg('Width:','width',$token,5);
321: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
322: } elsif ($target eq 'modified') {
323: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
324: $safeeval,'linktext',
325: 'width','height');
326: if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
327: }
328: return $result;
329: }
330:
331: sub end_window {
332: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
333: my $result;
334: if ($target eq 'web') {
335: my $output=&Apache::lonxml::endredirection;
336: $output =~ s/[\n\r]/ /g;
337: # $output = &HTML::Entities::encode($output,'<>&"\'');
338: $output =~ s/\'/\\\'/g;
339: my $linktext= &Apache::lonxml::get_param('linktext',$parstack,$safeeval);
340: if (!$linktext) { $linktext='<sup>*</sup>'; }
341: my $width= &Apache::lonxml::get_param('width',$parstack,$safeeval);
342: if (!$width) { $width='500'; }
343: my $height= &Apache::lonxml::get_param('height',$parstack,$safeeval);
344: if (!$height) { $height='200'; }
345:
346: my $start_page =
347: &Apache::loncommon::start_page($linktext, undef,
348: {'only_body' => 1,
349: 'bgcolor' => '#FFFFFF',
350: 'js_ready' => 1,});
351: my $end_page =
352: &Apache::loncommon::end_page({'js_ready' => 1,});
353: $result = "<script type=\"text/javascript\"> function LONCAPA_newwindow_$Apache::lonxml::curdepth() {newWindow=open('','new_W','width=$width,height=$height,scrollbars=1');newWindow.document.open('text/html','replace');newWindow.document.writeln('$start_page $output $end_page');newWindow.document.close();}</script><a href=\"javascript:LONCAPA_newwindow_$Apache::lonxml::curdepth();void(0);\">$linktext</a>";
354: } elsif ($target eq 'tex') {
355: $result = '}';
356: } else {
357: $result = '';
358: }
359: return $result;
360: }
361:
362: sub start_import {
363: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
364: my $bodytext=$$parser[$#$parser]->get_text("/import");
365: my $result ="";
366:
367: $bodytext=Apache::run::evaluate($bodytext,$safeeval,$$parstack[$#$parstack]);
368:
369: if ($target eq 'web' || $target eq 'webgrade' || $target eq 'grade'
370: || $target eq 'answer' || $target eq 'tex' || $target eq 'analyze' ) {
371: # FIXME this probably needs to be smart about construction vs.
372: # non construction space.
373: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],$bodytext);
374: my $file=&Apache::lonnet::getfile($location);
375: if ($file == -1) {
376: &Apache::lonxml::error("<b> Unable to find <i>$bodytext as $location</i> for import</b>");
377: return "";
378: }
379:
380: my $dir=$location;
381: $dir=~s:/[^/]*$::;
382: # &Apache::lonxml::debug("directory $dir $location file $file \n<b>END</b>\n");
383: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
384: if (!$id) { $id=$Apache::lonxml::curdepth; }
385: push(@Apache::inputtags::import,$id);
386: push(@Apache::inputtags::importlist,$id);
387:
388: &Apache::lonxml::newparser($parser,\$file,$dir);
389:
390: } elsif ($target eq "edit" ) {
391: $result.=&Apache::edit::tag_start($target,$token);
392: $result.=&Apache::edit::editline($token->[1],$bodytext,'',40);
393: $result.=&Apache::edit::browse(undef,'textnode');
394: #FIXME this need to convert $bodytext to be a contruction space reference
395: #my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],$bodytext);
396: #$result.="Click<a href=\"$location\">here</a> to edit<br />"
397: } elsif ($target eq 'modified') {
398: $result=$token->[4].&Apache::edit::modifiedfield("/import",$parser);
399: } elsif ($target eq 'meta') {
400: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
401: $result.='<import part="'.$Apache::inputtags::part;
402: if ($id) {
403: $result.='" id="'.$id;
404: }
405: $result.='">';
406: $result.=$bodytext;
407: $result.='</import>';
408: }
409: return $result;
410: }
411:
412: sub end_import {
413: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
414: pop(@Apache::inputtags::import);
415: my $result;
416: if ($target eq 'edit' ) { $result=&Apache::edit::end_row.
417: &Apache::edit::end_table(); }
418: return $result;
419: }
420:
421: sub start_storetc {
422: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
423: my $result = '';
424: &Apache::lonxml::startredirection;
425: return $result;
426: }
427:
428: sub end_storetc {
429: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
430: my $result;
431: my $output=&Apache::lonxml::endredirection;
432: $output =~ s/\"/\"\;/g;
433: $result = '{\bf '.$output.'.}}\write\tcfile{\protect\tcpc{ '.$output.'.}{\the\value{relpage}}}';
434: return $result;
435: }
436:
437:
438: sub start_physnet {
439: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
440: my $bodytext = '/adm/includes/physnet.sty';
441: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],$bodytext);
442: my $cbistyletext=&Apache::lonnet::getfile($location);
443:
444: %$style = (%$style,&Apache::style::styleparser($target,$cbistyletext));
445: $$parser['-1']->unget_token($token);
446: # if ( defined($$style{'physnet'}) ) {
447: # &Apache::lonxml::newparser($parser,\$$style{'physnet'});
448: # }
449: return "";
450: }
451:
452: sub end_physnet {
453: return '';
454: }
455:
456: sub start_standalone {
457: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
458: my $result='';
459: if ($target eq 'web' ) {
460: if ( $env{'request.course.id'} ) {
461: my $inside = &Apache::lonxml::get_all_text("/standalone",$parser,$style);
462: } else {
463: $result='<table bgcolor="#E1E1E1" border="2"><tr><td>';
464: }
465: }
466: return $result;
467: }
468:
469: sub end_standalone {
470: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
471: my $result='';
472: if ($target eq 'web' ) {
473: if ( $env{'request.course.id'} ) {
474: } else {
475: $result='</td></tr></table>';
476: }
477: }
478: return $result;
479: }
480:
481: sub start_comment {
482: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
483: my $result='';
484: if ($target eq 'edit') {
485: $result=&Apache::edit::tag_start($target,$token);
486: my $bodytext=&Apache::lonxml::get_all_text("/comment",$parser,$style);
487: $result.=&Apache::edit::editfield($token->[1],$bodytext,'',80,4)
488: } elsif ( $target eq 'modified') {
489: $result=$token->[4].&Apache::edit::modifiedfield("/comment",$parser);
490: } elsif ( $target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
491: $target eq 'answer' || $target eq 'meta' || $target eq 'analyze') {
492: #normally throw away comments
493: my $bodytext=&Apache::lonxml::get_all_text("/comment",$parser,$style);
494: }
495: return $result;
496: }
497:
498: sub end_comment {
499: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
500: if ($target eq 'edit' ) { return &Apache::edit::end_table(); }
501: return '';
502: }
503:
504:
505: sub xmlparse {
506: my ($string) = @_;
507: &Apache::lonxml::debug("xmlparse recursion starting with $string");
508: # Apache::run::evaluate does an 'eval' on the name of the subroutine
509: # if it detects something that looks like a subroutine, this ends up calling
510: # things without any arguments and since perl is nice enough to pass
511: # along the default arguments when you don't explicitly say no arguments
512: # if you call &xmlparse, it gets &xmlparse passed as it argument.
513: # Same thing soccurs with &chemparse.
514: if ($string eq '&xmlparse') { return '&xmlparse'; }
515: if ($string eq '&chemparse') { return '&chemparse'; }
516: my ($target,$token,$tagstack,$parstack,$oldparser,$safeeval,$style)=
517: @Apache::scripttag::parser_env;
518: my @parser;
519: &Apache::lonxml::newparser(\@parser,\$string);
520: &Apache::lonxml::startredirection();
521: my $result=&Apache::lonxml::inner_xmlparse($target,$tagstack,
522: $parstack,\@parser,
523: $safeeval,$style);
524: $result.=&Apache::lonxml::endredirection();
525: &Apache::lonxml::debug("target is $target xmlparse recursion ending with $result");
526: return $result;
527: }
528:
529: sub start_num {
530: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
531: my $result = '';
532: my $inside = &Apache::lonxml::get_all_text_unbalanced("/num",$parser);
533: if ($target eq 'tex' || $target eq 'web') {
534: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
535: if (!$Apache::lonxml::default_homework_loaded) {
536: &Apache::lonxml::default_homework_load($safeeval);
537: }
538: @Apache::scripttag::parser_env = @_;
539: my $format=&Apache::lonxml::get_param('format',$parstack,$safeeval);
540: $result=&Apache::run::run("return &prettyprint(q\0$inside\0,q\0$format\0);",$safeeval);
541: }
542: return $result;
543: }
544:
545: sub end_num {
546: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
547: my $result = '';
548: return $result;
549: }
550:
551: sub start_parse {
552: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
553: my $result = '';
554: if ( $target eq 'web' || $target eq 'tex' ||
555: $target eq 'grade' || $target eq 'answer' ||
556: $target eq 'analyze') {
557: my $inside = &Apache::lonxml::get_all_text_unbalanced("/parse",$parser);
558: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
559: if (!$Apache::lonxml::default_homework_loaded) {
560: &Apache::lonxml::default_homework_load($safeeval);
561: }
562: @Apache::scripttag::parser_env = @_;
563: $result=&Apache::run::run("return &xmlparse(q\0$inside\0);",$safeeval);
564: if ($target eq 'grade' || $target eq 'answer' ||
565: $target eq 'analyze') {
566: # grade/answer/analyxe should produce no output but if we
567: # are redirecting, the redirecter should know what to do
568: # with the output
569: if (!$Apache::lonxml::redirection) { $result=''; }
570: }
571: }
572: return $result;
573: }
574:
575: sub end_parse {
576: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
577: my $result = '';
578: return $result;
579: }
580:
581: sub start_algebra {
582: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
583: my $result = '';
584: if ( $target eq 'web' || $target eq 'tex' ||
585: $target eq 'grade' || $target eq 'answer' ||
586: $target eq 'analyze') {
587: my $inside = &Apache::lonxml::get_all_text_unbalanced("/algebra",$parser);
588: $inside = &Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
589: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
590: my $style=&Apache::lonxml::get_param('style',$parstack,$safeeval);
591: $result=&Apache::lontexconvert::algebra($inside,$target,$style);
592: }
593: $Apache::lonxml::post_evaluate=0;
594: }
595: return $result;
596: }
597:
598: sub end_algebra {
599: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
600: my $result = '';
601: return $result;
602: }
603:
604: 1;
605: __END__
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