1: # The LearningOnline Network with CAPA
2: # <script> definiton
3: #
4: # $Id: scripttag.pm,v 1.134 2005/12/15 19:00:36 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: $result.="<script type=\"text/javascript\">
122: // <![CDATA[
123: function LONCAPA_scriptvars_".$uname."_".$udom."_"."$Apache::lonxml::curdepth() {newWindow=open('','new_W','width=500,height=500,scrollbars=1,resizable=yes');newWindow.$windowopen;newWindow.document.writeln('<html><head><title>Script Vars</title></head><body bgcolor=\"#FFFFFF\"><pre>";
124: my $listing=&Apache::run::dump($target,$safeeval);
125: $listing=~s/\\/\\\\/g;
126: $listing=~s/\'/\\\'/g;
127: $result.=$listing;
128: $result.= "</pre></body></html>');newWindow.document.close();newWindow.focus()}
129: // ]]>
130: </script><a href=\"javascript:LONCAPA_scriptvars_".$uname."_".$udom."_$Apache::lonxml::curdepth();void(0);\">Script Vars</a><br />";
131: }
132: } elsif ($target eq "edit" ) {
133: #&Apache::run::run($bodytext,$safeeval);
134: #$result="<br /> <$token->[1]> output: <br />$bodytext<br />Source:<br />";
135: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
136: $result=&Apache::edit::tag_start($target,$token,'Script');
137: $result.=&Apache::edit::editfield($token->[1],$bodytext,'',80,4);
138: } elsif ($target eq 'meta') {
139: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
140: }
141: } else {
142: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/script",$parser);
143: if ($target ne "meta" && $target ne 'tex') {
144: $result = $token->[4];
145: $result.=$bodytext;
146: }
147: }
148: return $result;
149: }
150:
151: sub end_script {
152: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
153: if ( $target eq "meta" ) { return ''; }
154: my $type = &Apache::lonxml::get_param('type',$parstack,$safeeval);
155: my $result='';
156: #other script blocks need to survive
157: if ($type ne "loncapa/perl" && $target ne 'tex') {
158: return $token->[2];
159: } elsif ($target eq 'edit' ) {
160: return &Apache::edit::end_table();
161: } elsif ($target eq 'answer') {
162: $Apache::lonxml::evaluate++;
163: }
164: return '';
165: }
166:
167: sub start_display {
168: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
169: @Apache::scripttag::parser_env = @_;
170: my $result;
171:
172: if ( $target eq "modified" ) {
173: $result=$token->[4].&Apache::edit::modifiedfield("/display",$parser);
174: } elsif ( $target eq 'web' || $target eq 'tex' ||
175: $target eq 'grade' || $target eq 'webgrade' ||
176: $target eq 'answer' || $target eq 'analyze') {
177: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/display",$parser);
178: if (!$Apache::lonxml::default_homework_loaded) {
179: &Apache::lonxml::default_homework_load($safeeval);
180: }
181: $result=&Apache::run::run($bodytext,$safeeval);
182: if ($target eq 'grade' || $target eq 'answer' ||
183: $target eq 'analyze') {
184: # grade/answer/analyxe should produce no output but if we
185: # are redirecting, the redirecter should know what to do
186: # with the output
187: if (!$Apache::lonxml::redirection) { $result=''; }
188: }
189: $Apache::lonxml::post_evaluate=0;
190: } elsif ($target eq "edit" ) {
191: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/display",$parser);
192: #$result =
193: # "<br /> <$token->[1]> output: <br />$bodytext<br />Source:<br />";
194: #$result.=&Apache::edit::editfield($token->[1],$bodytext,'',40,1);
195: $result=&Apache::edit::tag_start($target,$token,'Script With Display');
196: $result.=&Apache::edit::editfield($token->[1],$bodytext,'',80,1)
197: } elsif ($target eq 'meta') {
198: my $bodytext=&Apache::lonxml::get_all_text_unbalanced("/display",$parser);
199: }
200: return $result;
201: }
202:
203: sub end_display {
204: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
205: if ($target eq 'edit' ) { return &Apache::edit::end_table(); }
206: return '';
207: }
208:
209: sub start_scriptlib {
210: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
211: my $bodytext;
212: my $result ='';
213: my $error='';
214:
215: if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
216: $target eq 'meta' || $target eq 'edit' || $target eq 'answer' ||
217: $target eq 'analyze') {
218: $bodytext=$$parser[$#$parser]->get_text("/scriptlib");
219: $bodytext=&Apache::run::evaluate($bodytext,$safeeval,
220: $$parstack[$#$parstack]);
221: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],
222: $bodytext);
223: my $script=&Apache::lonnet::getfile($location);
224: if ($script == -1) {
225: if ($target eq 'edit') {
226: $error='</tr><tr><td>Errors</td><td colspan="2"><b> Unable to find <i>'.$location.'</i></b></td>'."\n";
227: } else {
228: &Apache::lonxml::error("<b> Unable to find <i>$location</i> for scriptlib</b>");
229: return "";
230: }
231: }
232: &Apache::run::run($script,$safeeval);
233: #&Apache::lonxml::debug("ran $bodytext:<br />".&Apache::lonnet::getfile($bodytext)."<br />");
234: }
235: if ($target eq "edit" ) {
236: $result=
237: &Apache::edit::tag_start($target,$token,'New Script Functions').
238: &Apache::edit::editline($token->[1],$bodytext,'scriptlib',40).
239: &Apache::edit::browse(undef,'textnode').
240: $error.'</td></tr>'.
241: &Apache::edit::end_table();
242: }
243: if ($target eq "modified" ) {
244: $result=$token->[4].&Apache::edit::modifiedfield("/scriptlib",$parser);
245: }
246: return $result;
247: }
248:
249: sub end_scriptlib {
250: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
251: my @result;
252: if ($target eq "edit" ) { $result[1]='no'; }
253: return @result;
254: }
255:
256: sub start_parserlib {
257: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
258: my $bodytext;
259: my $result ="";
260: my $error='';
261: if ($target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
262: $target eq 'meta' || $target eq 'edit' || $target eq 'answer' ||
263: $target eq 'analyze') {
264: $bodytext=$$parser[$#$parser]->get_text("/parserlib");
265: $bodytext=&Apache::run::evaluate($bodytext,$safeeval,
266: $$parstack[$#$parstack]);
267: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],
268: $bodytext);
269: my $styletext=&Apache::lonnet::getfile($location);
270: #&Apache::lonxml::debug("found :$bodytext: in :$location: with :$styletext:");
271: if ($styletext == -1) {
272: if ($target eq 'edit') {
273: $error='</tr><tr><td>Errors</td><td colspan="2"><b> Unable to find <i>'.$location.'</i></b></td>'."\n";
274: } else {
275: &Apache::lonxml::error("<b> Unable to find <i>$location</i> for parserlib</b>");
276: return "";
277: }
278: }
279: %$style = ( %$style , &Apache::style::styleparser($target,$styletext));
280: }
281: if ($target eq "edit" ) {
282: $result=
283: &Apache::edit::tag_start($target,$token,'New Tag Definitions').
284: &Apache::edit::editline($token->[1],$bodytext,'',40).
285: $error.'</td></tr>'.
286: &Apache::edit::end_table();
287: }
288: if ($target eq "modified" ) {
289: $result=$token->[4].&Apache::edit::modifiedfield("/parserlib",$parser);
290: }
291: return $result;
292: }
293:
294: sub end_parserlib {
295: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
296: my @result;
297: if ($target eq "edit" ) { $result[1]='no'; }
298: return @result;
299: }
300:
301: sub start_window {
302: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
303: my $result = '';
304: if ($target eq 'web') {
305: &Apache::lonxml::startredirection;
306: } elsif ($target eq 'tex') {
307: $result = '\unskip\footnote{';
308: } elsif ($target eq 'edit') {
309: $result.=&Apache::edit::tag_start($target,$token);
310: $result.=&Apache::edit::text_arg('Text of Link:','linktext',$token,70);
311: $result.=&Apache::edit::text_arg('Height:','height',$token,5);
312: $result.=&Apache::edit::text_arg('Width:','width',$token,5);
313: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
314: } elsif ($target eq 'modified') {
315: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
316: $safeeval,'linktext',
317: 'width','height');
318: if ($constructtag) { $result=&Apache::edit::rebuild_tag($token); }
319: }
320: return $result;
321: }
322:
323: sub end_window {
324: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
325: my $result;
326: if ($target eq 'web') {
327: my $output=&Apache::lonxml::endredirection;
328: $output =~ s/[\n\r]/ /g;
329: # $output = &HTML::Entities::encode($output,'<>&"\'');
330: $output =~ s/\'/\\\'/g;
331: my $linktext= &Apache::lonxml::get_param('linktext',$parstack,$safeeval);
332: if (!$linktext) { $linktext='<sup>*</sup>'; }
333: my $width= &Apache::lonxml::get_param('width',$parstack,$safeeval);
334: if (!$width) { $width='500'; }
335: my $height= &Apache::lonxml::get_param('height',$parstack,$safeeval);
336: if (!$height) { $height='200'; }
337: $result = "<script type=\"text/javascript\"> function LONCAPA_newwindow_$Apache::lonxml::curdepth() {newWindow=open('','new_W','width=$width,height=$height,scrollbars=1');newWindow.document.open('text/html','replace');newWindow.document.writeln('<html><head><title>newwindow</title></head><body bgcolor=\"#FFFFFF\"> $output </body></html>');newWindow.document.close();}</script><a href=\"javascript:LONCAPA_newwindow_$Apache::lonxml::curdepth();void(0);\">$linktext</a>";
338: } elsif ($target eq 'tex') {
339: $result = '}';
340: } else {
341: $result = '';
342: }
343: return $result;
344: }
345:
346: sub start_import {
347: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
348: my $bodytext=$$parser[$#$parser]->get_text("/import");
349: my $result ="";
350:
351: $bodytext=Apache::run::evaluate($bodytext,$safeeval,$$parstack[$#$parstack]);
352:
353: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
354: $target eq 'tex' || $target eq 'analyze' ) {
355: # FIXME this probably needs to be smart about construction vs.
356: # non construction space.
357: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],$bodytext);
358: my $file=&Apache::lonnet::getfile($location);
359: if ($file == -1) {
360: &Apache::lonxml::error("<b> Unable to find <i>$bodytext as $location</i> for import</b>");
361: return "";
362: }
363:
364: my $dir=$location;
365: $dir=~s:/[^/]*$::;
366: # &Apache::lonxml::debug("directory $dir $location file $file \n<b>END</b>\n");
367: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
368: if (!$id) { $id=$Apache::lonxml::curdepth; }
369: push(@Apache::inputtags::import,$id);
370: push(@Apache::inputtags::importlist,$id);
371:
372: &Apache::lonxml::newparser($parser,\$file,$dir);
373:
374: } elsif ($target eq "edit" ) {
375: $result.=&Apache::edit::tag_start($target,$token);
376: $result.=&Apache::edit::editline($token->[1],$bodytext,'',40);
377: $result.=&Apache::edit::browse(undef,'textnode');
378: #FIXME this need to convert $bodytext to be a contruction space reference
379: #my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],$bodytext);
380: #$result.="Click<a href=\"$location\">here</a> to edit<br />"
381: } elsif ($target eq 'modified') {
382: $result=$token->[4].&Apache::edit::modifiedfield("/import",$parser);
383: } elsif ($target eq 'meta') {
384: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
385: $result.='<import part="'.$Apache::inputtags::part;
386: if ($id) {
387: $result.='" id="'.$id;
388: }
389: $result.='">';
390: $result.=$bodytext;
391: $result.='</import>';
392: }
393: return $result;
394: }
395:
396: sub end_import {
397: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
398: pop(@Apache::inputtags::import);
399: my $result;
400: if ($target eq 'edit' ) { $result=&Apache::edit::end_row.
401: &Apache::edit::end_table(); }
402: return $result;
403: }
404:
405: sub start_storetc {
406: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
407: my $result = '';
408: &Apache::lonxml::startredirection;
409: return $result;
410: }
411:
412: sub end_storetc {
413: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
414: my $result;
415: my $output=&Apache::lonxml::endredirection;
416: $output =~ s/\"/\"\;/g;
417: $result = '{\bf '.$output.'.}}\write\tcfile{\protect\tcpc{ '.$output.'.}{\the\value{relpage}}}';
418: return $result;
419: }
420:
421:
422: sub start_physnet {
423: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
424: my $bodytext = '/adm/includes/physnet.sty';
425: my $location=&Apache::lonnet::filelocation($Apache::lonxml::pwd['-1'],$bodytext);
426: my $cbistyletext=&Apache::lonnet::getfile($location);
427:
428: %$style = (%$style,&Apache::style::styleparser($target,$cbistyletext));
429: $$parser['-1']->unget_token($token);
430: # if ( defined($$style{'physnet'}) ) {
431: # &Apache::lonxml::newparser($parser,\$$style{'physnet'});
432: # }
433: return "";
434: }
435:
436: sub end_physnet {
437: return '';
438: }
439:
440: sub start_standalone {
441: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
442: my $result='';
443: if ($target eq 'web' ) {
444: if ( $env{'request.course.id'} ) {
445: my $inside = &Apache::lonxml::get_all_text("/standalone",$parser,$style);
446: } else {
447: $result='<table bgcolor="#E1E1E1" border="2"><tr><td>';
448: }
449: }
450: return $result;
451: }
452:
453: sub end_standalone {
454: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
455: my $result='';
456: if ($target eq 'web' ) {
457: if ( $env{'request.course.id'} ) {
458: } else {
459: $result='</td></tr></table>';
460: }
461: }
462: return $result;
463: }
464:
465: sub start_comment {
466: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
467: my $result='';
468: if ($target eq 'edit') {
469: $result=&Apache::edit::tag_start($target,$token);
470: my $bodytext=&Apache::lonxml::get_all_text("/comment",$parser,$style);
471: $result.=&Apache::edit::editfield($token->[1],$bodytext,'',80,4)
472: } elsif ( $target eq 'modified') {
473: $result=$token->[4].&Apache::edit::modifiedfield("/comment",$parser);
474: } elsif ( $target eq 'web' || $target eq 'tex' || $target eq 'grade' ||
475: $target eq 'answer' || $target eq 'meta' || $target eq 'analyze') {
476: #normally throw away comments
477: my $bodytext=&Apache::lonxml::get_all_text("/comment",$parser,$style);
478: }
479: return $result;
480: }
481:
482: sub end_comment {
483: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
484: if ($target eq 'edit' ) { return &Apache::edit::end_table(); }
485: return '';
486: }
487:
488:
489: sub xmlparse {
490: my ($string) = @_;
491: &Apache::lonxml::debug("xmlparse recursion starting with $string");
492: # Apache::run::evaluate does an 'eval' on the name of the subroutine
493: # if it detects something that looks like a subroutine, this ends up calling
494: # things without any arguments and since perl is nice enough to pass
495: # along the default arguments when you don't explicitly say no arguments
496: # if you call &xmlparse, it gets &xmlparse passed as it argument.
497: # Same thing soccurs with &chemparse.
498: if ($string eq '&xmlparse') { return '&xmlparse'; }
499: if ($string eq '&chemparse') { return '&chemparse'; }
500: my ($target,$token,$tagstack,$parstack,$oldparser,$safeeval,$style)=
501: @Apache::scripttag::parser_env;
502: my @parser;
503: &Apache::lonxml::newparser(\@parser,\$string);
504: &Apache::lonxml::startredirection();
505: my $result=&Apache::lonxml::inner_xmlparse($target,$tagstack,
506: $parstack,\@parser,
507: $safeeval,$style);
508: $result.=&Apache::lonxml::endredirection();
509: &Apache::lonxml::debug("target is $target xmlparse recursion ending with $result");
510: return $result;
511: }
512:
513: sub start_num {
514: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
515: my $result = '';
516: my $inside = &Apache::lonxml::get_all_text_unbalanced("/num",$parser);
517: if ($target eq 'tex' || $target eq 'web') {
518: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
519: if (!$Apache::lonxml::default_homework_loaded) {
520: &Apache::lonxml::default_homework_load($safeeval);
521: }
522: @Apache::scripttag::parser_env = @_;
523: my $format=&Apache::lonxml::get_param('format',$parstack,$safeeval);
524: $result=&Apache::run::run("return &prettyprint(q\0$inside\0,q\0$format\0);",$safeeval);
525: }
526: return $result;
527: }
528:
529: sub end_num {
530: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
531: my $result = '';
532: return $result;
533: }
534:
535: sub start_parse {
536: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
537: my $result = '';
538: if ( $target eq 'web' || $target eq 'tex' ||
539: $target eq 'grade' || $target eq 'answer' ||
540: $target eq 'analyze') {
541: my $inside = &Apache::lonxml::get_all_text_unbalanced("/parse",$parser);
542: $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
543: if (!$Apache::lonxml::default_homework_loaded) {
544: &Apache::lonxml::default_homework_load($safeeval);
545: }
546: @Apache::scripttag::parser_env = @_;
547: $result=&Apache::run::run("return &xmlparse(q\0$inside\0);",$safeeval);
548: if ($target eq 'grade' || $target eq 'answer' ||
549: $target eq 'analyze') {
550: # grade/answer/analyxe should produce no output but if we
551: # are redirecting, the redirecter should know what to do
552: # with the output
553: if (!$Apache::lonxml::redirection) { $result=''; }
554: }
555: }
556: return $result;
557: }
558:
559: sub end_parse {
560: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
561: my $result = '';
562: return $result;
563: }
564:
565: sub start_algebra {
566: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
567: my $result = '';
568: if ( $target eq 'web' || $target eq 'tex' ||
569: $target eq 'grade' || $target eq 'answer' ||
570: $target eq 'analyze') {
571: my $inside = &Apache::lonxml::get_all_text_unbalanced("/algebra",$parser);
572: $inside = &Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
573: if ($target eq 'web' || $target eq 'tex' || $target eq 'analyze') {
574: my $style=&Apache::lonxml::get_param('style',$parstack,$safeeval);
575: $result=&Apache::lontexconvert::algebra($inside,$target,$style);
576: }
577: $Apache::lonxml::post_evaluate=0;
578: }
579: return $result;
580: }
581:
582: sub end_algebra {
583: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
584: my $result = '';
585: return $result;
586: }
587:
588: 1;
589: __END__
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