1: # The LearningOnline Network with CAPA
2: # XML Parser Module
3: #
4: # $Id: lonxml.pm,v 1.140 2001/11/29 21:38:17 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: # Copyright for TtHfunc and TtMfunc by Ian Hutchinson.
29: # TtHfunc and TtMfunc (the "Code") may be compiled and linked into
30: # binary executable programs or libraries distributed by the
31: # Michigan State University (the "Licensee"), but any binaries so
32: # distributed are hereby licensed only for use in the context
33: # of a program or computational system for which the Licensee is the
34: # primary author or distributor, and which performs substantial
35: # additional tasks beyond the translation of (La)TeX into HTML.
36: # The C source of the Code may not be distributed by the Licensee
37: # to any other parties under any circumstances.
38: #
39: # last modified 06/26/00 by Alexander Sakharuk
40: # 11/6 Gerd Kortemeyer
41: # 6/1/1 Gerd Kortemeyer
42: # 2/21,3/13 Guy
43: # 3/29,5/4 Gerd Kortemeyer
44: # 5/10 Scott Harrison
45: # 5/26 Gerd Kortemeyer
46: # 5/27 H. K. Ng
47: # 6/2,6/3,6/8,6/9 Gerd Kortemeyer
48: # 6/12,6/13 H. K. Ng
49: # 6/16 Gerd Kortemeyer
50: # 7/27 H. K. Ng
51: # 8/7,8/9,8/10,8/11,8/15,8/16,8/17,8/18,8/20,8/23,8/24 Gerd Kortemeyer
52: # Guy Albertelli
53: # 9/26 Gerd Kortemeyer
54:
55:
56: package Apache::lonxml;
57: use vars
58: qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace);
59: use strict;
60: use HTML::TokeParser;
61: use HTML::TreeBuilder;
62: use Safe;
63: use Safe::Hole;
64: use Math::Cephes qw(:trigs :hypers :bessels erf erfc);
65: use Math::Random qw(:all);
66: use Opcode;
67:
68: sub register {
69: my $space;
70: my @taglist;
71: my $temptag;
72: ($space,@taglist) = @_;
73: foreach $temptag (@taglist) {
74: $Apache::lonxml::alltags{$temptag}=$space;
75: }
76: }
77:
78: use Apache::Constants qw(:common);
79: use Apache::lontexconvert;
80: use Apache::style;
81: use Apache::run;
82: use Apache::londefdef;
83: use Apache::scripttag;
84: use Apache::edit;
85: use Apache::lonnet;
86: use Apache::File;
87: use Apache::loncommon;
88:
89: #================================================== Main subroutine: xmlparse
90: #debugging control, to turn on debugging modify the correct handler
91: $Apache::lonxml::debug=0;
92:
93: #path to the directory containing the file currently being processed
94: @pwd=();
95:
96: #these two are used for capturing a subset of the output for later processing,
97: #don't touch them directly use &startredirection and &endredirection
98: @outputstack = ();
99: $redirection = 0;
100:
101: #controls wheter the <import> tag actually does
102: $import = 1;
103: @extlinks=();
104:
105: # meta mode is a bit weird only some output is to be turned off
106: #<output> tag turns metamode off (defined in londefdef.pm)
107: $metamode = 0;
108:
109: # turns on and of run::evaluate actually derefencing var refs
110: $evaluate = 1;
111:
112: # data structure for eidt mode, determines what tags can go into what other tags
113: %insertlist=();
114:
115: # stores the list of active tag namespaces
116: @namespace=();
117:
118: # has the dynamic menu been updated to know about this resource
119: $Apache::lonxml::registered=0;
120:
121: sub xmlbegin {
122: my $output='';
123: if ($ENV{'browser.mathml'}) {
124: $output='<?xml version="1.0"?>'
125: .'<?xml-stylesheet type="text/css" href="/adm/MathML/mathml.css"?>'
126: .'<!DOCTYPE html SYSTEM "/adm/MathML/mathml.dtd" '
127: .'[<!ENTITY mathns "http://www.w3.org/1998/Math/MathML">]>'
128: .'<html xmlns:math="http://www.w3.org/1998/Math/MathML" '
129: .'xmlns="http://www.w3.org/TR/REC-html40">';
130: } else {
131: $output='<html>';
132: }
133: return $output;
134: }
135:
136: sub xmlend {
137: my $discussion='';
138: if ($ENV{'request.course.id'}) {
139: my $crs='/'.$ENV{'request.course.id'};
140: if ($ENV{'request.course.sec'}) {
141: $crs.='_'.$ENV{'request.course.sec'};
142: }
143: $crs=~s/\_/\//g;
144: my $seeid=&Apache::lonnet::allowed('rin',$crs);
145: my $symb=&Apache::lonnet::symbread();
146: if ($symb) {
147: my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},
148: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
149: $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
150: if ($contrib{'version'}) {
151: $discussion.=
152: '<address><hr /><h2>Course Discussion of Resource</h2>';
153: my $idx;
154: for ($idx=1;$idx<=$contrib{'version'};$idx++) {
155: my $hidden=($contrib{'hidden'}=~/\.$idx\./);
156: unless (($hidden) && (!$seeid)) {
157: my $message=$contrib{$idx.':message'};
158: $message=~s/\n/\<br \/\>/g;
159: if ($message) {
160: if ($hidden) {
161: $message='<font color="#888888">'.$message.'</font>';
162: }
163: my $sender='Anonymous';
164: if ((!$contrib{$idx.':anonymous'}) || ($seeid)) {
165: $sender=$contrib{$idx.':sendername'}.' at '.
166: $contrib{$idx.':senderdomain'};
167: if ($contrib{$idx.':anonymous'}) {
168: $sender.=' (anonymous)';
169: }
170: if ($seeid) {
171: if ($hidden) {
172: $sender.=' <a href="/adm/feedback?unhide='.
173: $symb.':::'.$idx.'">Make Visible</a>';
174: } else {
175: $sender.=' <a href="/adm/feedback?hide='.
176: $symb.':::'.$idx.'">Hide</a>';
177: }
178: }
179: }
180: $discussion.='<p><b>'.$sender.'</b> ('.
181: localtime($contrib{$idx.':timestamp'}).
182: '):<blockquote>'.$message.
183: '</blockquote></p>';
184: }
185: }
186: }
187: $discussion.='</address>';
188: }
189: }
190: }
191: return $discussion.'</html>';
192: }
193:
194: sub tokeninputfield {
195: my $defhost=$Apache::lonnet::perlvar{'lonHostID'};
196: $defhost=~tr/a-z/A-Z/;
197: return (<<ENDINPUTFIELD)
198: <script>
199: function updatetoken() {
200: var comp=new Array;
201: var barcode=unescape(document.tokeninput.barcode.value);
202: comp=barcode.split('*');
203: if (typeof(comp[0])!="undefined") {
204: document.tokeninput.codeone.value=comp[0];
205: }
206: if (typeof(comp[1])!="undefined") {
207: document.tokeninput.codetwo.value=comp[1];
208: }
209: if (typeof(comp[2])!="undefined") {
210: comp[2]=comp[2].toUpperCase();
211: document.tokeninput.codethree.value=comp[2];
212: }
213: document.tokeninput.barcode.value='';
214: }
215: </script>
216: <form method="post" name="tokeninput">
217: <table border="2" bgcolor="#FFFFBB">
218: <tr><th>DocID Checkin</th></tr>
219: <tr><td>
220: <table>
221: <tr>
222: <td>Scan in Barcode</td>
223: <td><input type="text" size="22" name="barcode"
224: onChange="updatetoken()"/></td>
225: </tr>
226: <tr><td><i>or</i> Type in DocID</td>
227: <td>
228: <input type="text" size="5" name="codeone" />
229: <b><font size="+2">*</font></b>
230: <input type="text" size="5" name="codetwo" />
231: <b><font size="+2">*</font></b>
232: <input type="text" size="10" name="codethree" value="$defhost"
233: onChange="this.value=this.value.toUpperCase()" />
234: </td></tr>
235: </table>
236: </td></tr>
237: <tr><td><input type="submit" value="Check in DocID" /></td></tr>
238: </table>
239: </form>
240: ENDINPUTFIELD
241: }
242:
243: sub maketoken {
244: my ($symb,$tuname,$tudom,$tcrsid)=@_;
245: unless ($symb) {
246: $symb=&Apache::lonnet::symbread();
247: }
248: unless ($tuname) {
249: $tuname=$ENV{'user.name'};
250: $tudom=$ENV{'user.domain'};
251: $tcrsid=$ENV{'request.course.id'};
252: }
253:
254: return &Apache::lonnet::checkout($symb,$tuname,$tudom,$tcrsid);
255: }
256:
257: sub printtokenheader {
258: my ($target,$token,$tsymb,$tcrsid,$tudom,$tuname)=@_;
259: unless ($token) { return ''; }
260:
261: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
262: unless ($tsymb) {
263: $tsymb=$symb;
264: }
265: unless ($tuname) {
266: $tuname=$name;
267: $tudom=$domain;
268: $tcrsid=$courseid;
269: }
270:
271: my %reply=&Apache::lonnet::get('environment',
272: ['firstname','middlename','lastname','generation'],
273: $tudom,$tuname);
274: my $plainname=$reply{'firstname'}.' '.
275: $reply{'middlename'}.' '.
276: $reply{'lastname'}.' '.
277: $reply{'generation'};
278:
279: if ($target eq 'web') {
280: return
281: '<img align="right" src="/cgi-bin/barcode.gif?encode='.$token.'" />'.
282: 'Checked out for '.$plainname.
283: '<br />User: '.$tuname.' at '.$tudom.
284: '<br />CourseID: '.$tcrsid.
285: '<br />DocID: '.$token.
286: '<br />Time: '.localtime().'<hr />';
287: } else {
288: return $token;
289: }
290: }
291:
292: sub fontsettings() {
293: my $headerstring='';
294: if (($ENV{'browser.os'} eq 'mac') && (!$ENV{'browser.mathml'})) {
295: $headerstring.=
296: '<meta Content-Type="text/html; charset=x-mac-roman">';
297: }
298: return $headerstring;
299: }
300:
301: sub registerurl {
302: my $forcereg=shift;
303: if ($ENV{'request.publicaccess'}) {
304: return
305: '<script>function LONCAPAreg(){} function LONCAPAstale(){}</script>';
306: }
307: if ($Apache::lonxml::registered && !$forcereg) { return ''; }
308: $Apache::lonxml::registered=1;
309: if (($ENV{'REQUEST_URI'}!~/^\/(res\/)*adm\//) || ($forcereg)) {
310: my $hwkadd='';
311: if ($ENV{'REQUEST_URI'}=~/\.(problem|exam|quiz|assess|survey|form)$/) {
312: if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
313: $hwkadd.=(<<ENDSUBM);
314: menu.switchbutton
315: (7,1,'subm.gif','view sub','missions',
316: 'gocmd("/adm/grades","submission")');
317: ENDSUBM
318: }
319: if (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'})) {
320: $hwkadd.=(<<ENDGRDS);
321: menu.switchbutton
322: (7,2,'pgrd.gif','problem','grades',
323: 'gocmd("/adm/grades","viewgrades")');
324: ENDGRDS
325: }
326: if (&Apache::lonnet::allowed('opa',$ENV{'request.course.id'})) {
327: $hwkadd.=(<<ENDPARM);
328: menu.switchbutton
329: (7,3,'pparm.gif','problem','parms',
330: 'gocmd("/adm/parmset","set")');
331: ENDPARM
332: }
333: }
334: return (<<ENDREGTHIS);
335:
336: <script language="JavaScript">
337: // BEGIN LON-CAPA Internal
338:
339: function LONCAPAreg() {
340: menu=window.open("","LONCAPAmenu");
341: menu.clearTimeout(menu.menucltim);
342: menu.currentURL=window.location.pathname;
343: menu.currentStale=0;
344: menu.clearbut(3,1);
345: menu.switchbutton
346: (6,3,'catalog.gif','catalog','info','catalog_info()');
347: menu.switchbutton
348: (8,1,'eval.gif','evaluate','this','gopost("/adm/evaluate",currentURL)');
349: menu.switchbutton
350: (8,2,'fdbk.gif','feedback','on this','gopost("/adm/feedback",currentURL)');
351: menu.switchbutton
352: (8,3,'prt.gif','prepare','printout','gopost("/adm/printout",currentURL)');
353: menu.switchbutton
354: (2,1,'back.gif','backward','','gopost("/adm/flip","back:"+currentURL)');
355: menu.switchbutton
356: (2,3,'forw.gif','forward','','gopost("/adm/flip","forward:"+currentURL)');
357: menu.switchbutton
358: (9,1,'sbkm.gif','set','bookmark','set_bookmark()');
359: menu.switchbutton
360: (9,2,'vbkm.gif','view','bookmark','edit_bookmarks()');
361: menu.switchbutton
362: (9,3,'anot.gif','anno-','tations','annotate()');
363: $hwkadd
364: }
365:
366: function LONCAPAstale() {
367: menu=window.open("","LONCAPAmenu");
368: menu.currentStale=1;
369: menu.switchbutton
370: (3,1,'reload.gif','return','location','go(currentURL)');
371: menu.clearbut(7,1);
372: menu.clearbut(7,2);
373: menu.clearbut(7,3);
374: menu.menucltim=menu.setTimeout(
375: 'clearbut(2,1);clearbut(2,3);clearbut(8,1);clearbut(8,2);clearbut(8,3);'+
376: 'clearbut(9,1);clearbut(9,2);clearbut(9,3);clearbut(6,3)',
377: 2000);
378:
379: }
380:
381: // END LON-CAPA Internal
382: </script>
383: ENDREGTHIS
384:
385: } else {
386: return (<<ENDDONOTREGTHIS);
387:
388: <script language="JavaScript">
389: // BEGIN LON-CAPA Internal
390:
391: function LONCAPAreg() {
392: menu=window.open("","LONCAPAmenu");
393: menu.currentStale=1;
394: menu.clearbut(2,1);
395: menu.clearbut(2,3);
396: menu.clearbut(8,1);
397: menu.clearbut(8,2);
398: menu.clearbut(8,3);
399: if (menu.currentURL) {
400: menu.switchbutton
401: (3,1,'reload.gif','return','location','go(currentURL)');
402: } else {
403: menu.clearbut(3,1);
404: }
405: }
406:
407: function LONCAPAstale() {
408: }
409:
410: // END LON-CAPA Internal
411: </script>
412: ENDDONOTREGTHIS
413:
414: }
415: }
416:
417: sub loadevents() {
418: return 'LONCAPAreg();';
419: }
420:
421: sub unloadevents() {
422: return 'LONCAPAstale();';
423: }
424:
425: sub printalltags {
426: my $temp;
427: foreach $temp (sort keys %Apache::lonxml::alltags) {
428: &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
429: }
430: }
431:
432: sub xmlparse {
433: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
434:
435: &setup_globals($target);
436: #&printalltags();
437: my @pars = ();
438: my $pwd=$ENV{'request.filename'};
439: $pwd =~ s:/[^/]*$::;
440: &newparser(\@pars,\$content_file_string,$pwd);
441:
442: my $safeeval = new Safe;
443: my $safehole = new Safe::Hole;
444: &init_safespace($target,$safeeval,$safehole,$safeinit);
445: #-------------------- Redefinition of the target in the case of compound target
446:
447: ($target, my @tenta) = split('&&',$target);
448:
449: my @stack = ();
450: my @parstack = ();
451: &initdepth;
452:
453: my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars,
454: $safeeval,\%style_for_target);
455: if ($ENV{'request.uri'}) {
456: &writeallows($ENV{'request.uri'});
457: }
458: return $finaloutput;
459: }
460:
461: sub htmlclean {
462: my ($raw,$full)=@_;
463:
464: my $tree = HTML::TreeBuilder->new;
465: $tree->ignore_unknown(0);
466:
467: $tree->parse($raw);
468:
469: my $output= $tree->as_HTML(undef,' ');
470:
471: $output=~s/\<(br|hr|img|meta|allow)([^\>\/]*)\>/\<$1$2 \/\>/gis;
472: $output=~s/\<\/(br|hr|img|meta|allow)\>//gis;
473: unless ($full) {
474: $output=~s/\<[\/]*(body|head|html)\>//gis;
475: }
476:
477: $tree = $tree->delete;
478:
479: return $output;
480: }
481:
482: sub inner_xmlparse {
483: my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target)=@_;
484: my $finaloutput = '';
485: my $result;
486: my $token;
487: while ( $#$pars > -1 ) {
488: while ($token = $$pars['-1']->get_token) {
489: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
490: if ($metamode<1) {
491: $result=$token->[1];
492: }
493: } elsif ($token->[0] eq 'PI') {
494: if ($metamode<1) {
495: $result=$token->[2];
496: }
497: } elsif ($token->[0] eq 'S') {
498: # add tag to stack
499: push (@$stack,$token->[1]);
500: # add parameters list to another stack
501: push (@$parstack,&parstring($token));
502: &increasedepth($token);
503: if (exists $$style_for_target{$token->[1]}) {
504: if ($Apache::lonxml::redirection) {
505: $Apache::lonxml::outputstack['-1'] .=
506: &recurse($$style_for_target{$token->[1]},$target,$safeeval,
507: $style_for_target,@$parstack);
508: } else {
509: $finaloutput .= &recurse($$style_for_target{$token->[1]},$target,
510: $safeeval,$style_for_target,@$parstack);
511: }
512: } else {
513: $result = &callsub("start_$token->[1]", $target, $token, $stack,
514: $parstack, $pars, $safeeval, $style_for_target);
515: }
516: } elsif ($token->[0] eq 'E') {
517: #clear out any tags that didn't end
518: while ($token->[1] ne $$stack['-1'] && ($#$stack > -1)) {
519: &Apache::lonxml::warning('Missing tag </'.$$stack['-1'].'> in file');
520: &end_tag($stack,$parstack,$token);
521: }
522:
523: if (exists($$style_for_target{'/'."$token->[1]"})) {
524: if ($Apache::lonxml::redirection) {
525: $Apache::lonxml::outputstack['-1'] .=
526: &recurse($$style_for_target{'/'."$token->[1]"},
527: $target,$safeeval,$style_for_target,@$parstack);
528: } else {
529: $finaloutput .= &recurse($$style_for_target{'/'."$token->[1]"},
530: $target,$safeeval,$style_for_target,
531: @$parstack);
532: }
533: } else {
534: $result = &callsub("end_$token->[1]", $target, $token, $stack,
535: $parstack, $pars,$safeeval, $style_for_target);
536: }
537: } else {
538: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
539: }
540: #evaluate variable refs in result
541: if ($result ne "") {
542: if ( $#$parstack > -1 ) {
543: if ($Apache::lonxml::redirection) {
544: $Apache::lonxml::outputstack['-1'] .=
545: &Apache::run::evaluate($result,$safeeval,$$parstack['-1']);
546: } else {
547: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
548: $$parstack['-1']);
549: }
550: } else {
551: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
552: }
553: $result = '';
554: }
555: if ($token->[0] eq 'E') {
556: &end_tag($stack,$parstack,$token);
557: }
558: }
559: pop @$pars;
560: pop @Apache::lonxml::pwd;
561: }
562:
563: # if ($target eq 'meta') {
564: # $finaloutput.=&endredirection;
565: # }
566:
567: if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) {
568: $finaloutput=&afterburn($finaloutput);
569: }
570: return $finaloutput;
571: }
572:
573: sub recurse {
574: my @innerstack = ();
575: my @innerparstack = ();
576: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
577: my @pat = ();
578: &newparser(\@pat,\$newarg);
579: my $tokenpat;
580: my $partstring = '';
581: my $output='';
582: my $decls='';
583: &Apache::lonxml::debug("Recursing");
584: while ( $#pat > -1 ) {
585: while ($tokenpat = $pat[$#pat]->get_token) {
586: if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) {
587: if ($metamode<1) { $partstring=$tokenpat->[1]; }
588: } elsif ($tokenpat->[0] eq 'PI') {
589: if ($metamode<1) { $partstring=$tokenpat->[2]; }
590: } elsif ($tokenpat->[0] eq 'S') {
591: push (@innerstack,$tokenpat->[1]);
592: push (@innerparstack,&parstring($tokenpat));
593: &increasedepth($tokenpat);
594: $partstring = &callsub("start_$tokenpat->[1]", $target, $tokenpat,
595: \@innerstack, \@innerparstack, \@pat,
596: $safeeval, $style_for_target);
597: } elsif ($tokenpat->[0] eq 'E') {
598: #clear out any tags that didn't end
599: while ($tokenpat->[1] ne $innerstack[$#innerstack]
600: && ($#innerstack > -1)) {
601: &Apache::lonxml::warning('Missing tag </'.$innerstack['-1'].'> in style');
602: &end_tag(\@innerstack,\@innerparstack,$tokenpat);
603: }
604: $partstring = &callsub("end_$tokenpat->[1]", $target, $tokenpat,
605: \@innerstack, \@innerparstack, \@pat,
606: $safeeval, $style_for_target);
607: } else {
608: &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:");
609: }
610: #pass both the variable to the style tag, and the tag we
611: #are processing inside the <definedtag>
612: if ( $partstring ne "" ) {
613: if ( $#parstack > -1 ) {
614: if ( $#innerparstack > -1 ) {
615: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
616: } else {
617: $decls= $parstack[$#parstack];
618: }
619: } else {
620: if ( $#innerparstack > -1 ) {
621: $decls=$innerparstack[$#innerparstack];
622: } else {
623: $decls='';
624: }
625: }
626: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
627: $partstring = '';
628: }
629: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
630: &decreasedepth($tokenpat);}
631: }
632: pop @pat;
633: pop @Apache::lonxml::pwd;
634: }
635: &Apache::lonxml::debug("Exiting Recursing");
636: return $output;
637: }
638:
639: sub callsub {
640: my ($sub,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
641: my $currentstring='';
642: my $nodefault;
643: {
644: my $sub1;
645: no strict 'refs';
646: my $tag=$token->[1];
647: my $space=$Apache::lonxml::alltags{$tag};
648: if (!$space) {
649: $tag=~tr/A-Z/a-z/;
650: $sub=~tr/A-Z/a-z/;
651: $space=$Apache::lonxml::alltags{$tag}
652: }
653:
654: my $deleted=0;
655: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
656: if (($token->[0] eq 'S') && ($target eq 'modified')) {
657: $deleted=&Apache::edit::handle_delete($space,$target,$token,$tagstack,
658: $parstack,$parser,$safeeval,
659: $style);
660: }
661: if (!$deleted) {
662: if ($space) {
663: #&Apache::lonxml::debug("Calling sub $sub in $space $metamode<br />\n");
664: $sub1="$space\:\:$sub";
665: ($currentstring,$nodefault) = &$sub1($target,$token,$tagstack,
666: $parstack,$parser,$safeeval,
667: $style);
668: } else {
669: #&Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode<br />\n");
670: if ($metamode <1) {
671: if (defined($token->[4]) && ($metamode < 1)) {
672: $currentstring = $token->[4];
673: } else {
674: $currentstring = $token->[2];
675: }
676: }
677: }
678: # &Apache::lonxml::debug("nodefalt:$nodefault:");
679: if ($currentstring eq '' && $nodefault eq '') {
680: if ($target eq 'edit') {
681: &Apache::lonxml::debug("doing default edit for $token->[1]");
682: if ($token->[0] eq 'S') {
683: $currentstring = &Apache::edit::tag_start($target,$token);
684: } elsif ($token->[0] eq 'E') {
685: $currentstring = &Apache::edit::tag_end($target,$token);
686: }
687: } elsif ($target eq 'modified') {
688: if ($token->[0] eq 'S') {
689: $currentstring = $token->[4];
690: $currentstring.=&Apache::edit::handle_insert();
691: } else {
692: $currentstring = $token->[2];
693: }
694: }
695: }
696: }
697: use strict 'refs';
698: }
699: return $currentstring;
700: }
701:
702: sub setup_globals {
703: my ($target)=@_;
704: $Apache::lonxml::registered = 0;
705: @Apache::lonxml::pwd=();
706: @Apache::lonxml::extlinks=();
707: if ($target eq 'meta') {
708: $Apache::lonxml::redirection = 0;
709: $Apache::lonxml::metamode = 1;
710: $Apache::lonxml::evaluate = 1;
711: $Apache::lonxml::import = 0;
712: } elsif ($target eq 'answer') {
713: $Apache::lonxml::redirection = 0;
714: $Apache::lonxml::metamode = 1;
715: $Apache::lonxml::evaluate = 1;
716: $Apache::lonxml::import = 1;
717: } elsif ($target eq 'grade') {
718: &startredirection;
719: $Apache::lonxml::metamode = 0;
720: $Apache::lonxml::evaluate = 1;
721: $Apache::lonxml::import = 1;
722: } elsif ($target eq 'modified') {
723: $Apache::lonxml::redirection = 0;
724: $Apache::lonxml::metamode = 0;
725: $Apache::lonxml::evaluate = 0;
726: $Apache::lonxml::import = 0;
727: } elsif ($target eq 'edit') {
728: $Apache::lonxml::redirection = 0;
729: $Apache::lonxml::metamode = 0;
730: $Apache::lonxml::evaluate = 0;
731: $Apache::lonxml::import = 0;
732: } else {
733: $Apache::lonxml::redirection = 0;
734: $Apache::lonxml::metamode = 0;
735: $Apache::lonxml::evaluate = 1;
736: $Apache::lonxml::import = 1;
737: }
738: }
739:
740: sub init_safespace {
741: my ($target,$safeeval,$safehole,$safeinit) = @_;
742: $safeeval->permit("entereval");
743: $safeeval->permit(":base_math");
744: $safeeval->permit("sort");
745: $safeeval->deny(":base_io");
746: $safehole->wrap(\&Apache::scripttag::xmlparse,$safeeval,'&xmlparse');
747: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
748:
749: $safehole->wrap(\&Math::Cephes::asin,$safeeval,'&asin');
750: $safehole->wrap(\&Math::Cephes::acos,$safeeval,'&acos');
751: $safehole->wrap(\&Math::Cephes::atan,$safeeval,'&atan');
752: $safehole->wrap(\&Math::Cephes::sinh,$safeeval,'&sinh');
753: $safehole->wrap(\&Math::Cephes::cosh,$safeeval,'&cosh');
754: $safehole->wrap(\&Math::Cephes::tanh,$safeeval,'&tanh');
755: $safehole->wrap(\&Math::Cephes::asinh,$safeeval,'&asinh');
756: $safehole->wrap(\&Math::Cephes::acosh,$safeeval,'&acosh');
757: $safehole->wrap(\&Math::Cephes::atanh,$safeeval,'&atanh');
758: $safehole->wrap(\&Math::Cephes::erf,$safeeval,'&erf');
759: $safehole->wrap(\&Math::Cephes::erfc,$safeeval,'&erfc');
760: $safehole->wrap(\&Math::Cephes::j0,$safeeval,'&j0');
761: $safehole->wrap(\&Math::Cephes::j1,$safeeval,'&j1');
762: $safehole->wrap(\&Math::Cephes::jn,$safeeval,'&jn');
763: $safehole->wrap(\&Math::Cephes::jv,$safeeval,'&jv');
764: $safehole->wrap(\&Math::Cephes::y0,$safeeval,'&y0');
765: $safehole->wrap(\&Math::Cephes::y1,$safeeval,'&y1');
766: $safehole->wrap(\&Math::Cephes::yn,$safeeval,'&yn');
767: $safehole->wrap(\&Math::Cephes::yv,$safeeval,'&yv');
768: $safehole->wrap(\&Math::Random::random_beta,$safeeval,'&math_random_beta');
769: $safehole->wrap(\&Math::Random::random_chi_square,$safeeval,'&math_random_chi_square');
770: $safehole->wrap(\&Math::Random::random_exponential,$safeeval,'&math_random_exponential');
771: $safehole->wrap(\&Math::Random::random_f,$safeeval,'&math_random_f');
772: $safehole->wrap(\&Math::Random::random_gamma,$safeeval,'&math_random_gamma');
773: $safehole->wrap(\&Math::Random::random_multivariate_normal,$safeeval,'&math_random_multivariate_normal');
774: $safehole->wrap(\&Math::Random::random_multinomial,$safeeval,'&math_random_multinomial');
775: $safehole->wrap(\&Math::Random::random_noncentral_chi_square,$safeeval,'&math_random_noncentral_chi_square');
776: $safehole->wrap(\&Math::Random::random_noncentral_f,$safeeval,'&math_random_noncentral_f');
777: $safehole->wrap(\&Math::Random::random_normal,$safeeval,'&math_random_normal');
778: $safehole->wrap(\&Math::Random::random_permutation,$safeeval,'&math_random_permutation');
779: $safehole->wrap(\&Math::Random::random_permuted_index,$safeeval,'&math_random_permuted_index');
780: $safehole->wrap(\&Math::Random::random_uniform,$safeeval,'&math_random_uniform');
781: $safehole->wrap(\&Math::Random::random_poisson,$safeeval,'&math_random_poisson');
782: $safehole->wrap(\&Math::Random::random_uniform_integer,$safeeval,'&math_random_uniform_integer');
783: $safehole->wrap(\&Math::Random::random_negative_binomial,$safeeval,'&math_random_negative_binomial');
784: $safehole->wrap(\&Math::Random::random_binomial,$safeeval,'&math_random_binomial');
785: $safehole->wrap(\&Math::Random::random_seed_from_phrase,$safeeval,'&random_seed_from_phrase');
786: $safehole->wrap(\&Math::Random::random_set_seed_from_phrase,$safeeval,'&random_set_seed_from_phrase');
787: $safehole->wrap(\&Math::Random::random_get_seed,$safeeval,'&random_get_seed');
788: $safehole->wrap(\&Math::Random::random_set_seed,$safeeval,'&random_set_seed');
789:
790: #need to inspect this class of ops
791: # $safeeval->deny(":base_orig");
792: $safeinit .= ';$external::target="'.$target.'";';
793: my $rndseed;
794: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
795: $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name);
796: $safeinit .= ';$external::randomseed='.$rndseed.';';
797: &Apache::run::run($safeinit,$safeeval);
798: }
799:
800: sub startredirection {
801: $Apache::lonxml::redirection++;
802: push (@Apache::lonxml::outputstack, '');
803: }
804:
805: sub endredirection {
806: if (!$Apache::lonxml::redirection) {
807: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuging information:".join ":",caller);
808: return '';
809: }
810: $Apache::lonxml::redirection--;
811: pop @Apache::lonxml::outputstack;
812: }
813:
814: sub end_tag {
815: my ($tagstack,$parstack,$token)=@_;
816: pop(@$tagstack);
817: pop(@$parstack);
818: &decreasedepth($token);
819: }
820:
821: sub initdepth {
822: @Apache::lonxml::depthcounter=();
823: $Apache::lonxml::depth=-1;
824: $Apache::lonxml::olddepth=-1;
825: }
826:
827: sub increasedepth {
828: my ($token) = @_;
829: $Apache::lonxml::depth++;
830: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
831: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
832: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
833: }
834: my $curdepth=join('_',@Apache::lonxml::depthcounter);
835: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
836: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
837: }
838:
839: sub decreasedepth {
840: my ($token) = @_;
841: $Apache::lonxml::depth--;
842: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
843: $#Apache::lonxml::depthcounter--;
844: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
845: }
846: if ( $Apache::lonxml::depth < -1) {
847: &Apache::lonxml::warning("Missing tags, unable to properly run file.");
848: $Apache::lonxml::depth='-1';
849: }
850: my $curdepth=join('_',@Apache::lonxml::depthcounter);
851: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
852: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
853: }
854:
855: sub get_all_text {
856:
857: my($tag,$pars)= @_;
858: my $depth=0;
859: my $token;
860: my $result='';
861: if ( $tag =~ m:^/: ) {
862: my $tag=substr($tag,1);
863: # &Apache::lonxml::debug("have:$tag:");
864: while (($depth >=0) && ($token = $pars->get_token)) {
865: # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]");
866: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
867: $result.=$token->[1];
868: } elsif ($token->[0] eq 'PI') {
869: $result.=$token->[2];
870: } elsif ($token->[0] eq 'S') {
871: if ($token->[1] eq $tag) { $depth++; }
872: $result.=$token->[4];
873: } elsif ($token->[0] eq 'E') {
874: if ( $token->[1] eq $tag) { $depth--; }
875: #skip sending back the last end tag
876: if ($depth > -1) { $result.=$token->[2]; } else {
877: $pars->unget_token($token);
878: }
879: }
880: }
881: } else {
882: while ($token = $pars->get_token) {
883: # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
884: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
885: $result.=$token->[1];
886: } elsif ($token->[0] eq 'PI') {
887: $result.=$token->[2];
888: } elsif ($token->[0] eq 'S') {
889: if ( $token->[1] eq $tag) {
890: $pars->unget_token($token); last;
891: } else {
892: $result.=$token->[4];
893: }
894: } elsif ($token->[0] eq 'E') {
895: $result.=$token->[2];
896: }
897: }
898: }
899: # &Apache::lonxml::debug("Exit:$result:");
900: return $result
901: }
902:
903: sub newparser {
904: my ($parser,$contentref,$dir) = @_;
905: push (@$parser,HTML::TokeParser->new($contentref));
906: $$parser['-1']->xml_mode('1');
907: if ( $dir eq '' ) {
908: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
909: } else {
910: push (@Apache::lonxml::pwd, $dir);
911: }
912: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
913: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
914: }
915:
916: sub parstring {
917: my ($token) = @_;
918: my $temp='';
919: map {
920: unless ($_=~/\W/) {
921: my $val=$token->[2]->{$_};
922: $val =~ s/([\%\@\\])/\\$1/g;
923: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
924: $temp .= "my \$$_=\"$val\";"
925: }
926: } @{$token->[3]};
927: return $temp;
928: }
929:
930: sub writeallows {
931: unless ($#extlinks>=0) { return; }
932: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
933: if ($ENV{'httpref.'.$thisurl}) {
934: $thisurl=$ENV{'httpref.'.$thisurl};
935: }
936: my $thisdir=$thisurl;
937: $thisdir=~s/\/[^\/]+$//;
938: my %httpref=();
939: map {
940: $httpref{'httpref.'.
941: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl;
942: } @extlinks;
943: @extlinks=();
944: &Apache::lonnet::appenv(%httpref);
945: }
946:
947: #
948: # Afterburner handles anchors, highlights and links
949: #
950: sub afterburn {
951: my $result=shift;
952: map {
953: my ($name, $value) = split(/=/,$_);
954: $value =~ tr/+/ /;
955: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
956: if (($name eq 'highlight')||($name eq 'anchor')||($name eq 'link')) {
957: unless ($ENV{'form.'.$name}) {
958: $ENV{'form.'.$name}=$value;
959: }
960: }
961: } (split(/&/,$ENV{'QUERY_STRING'}));
962: if ($ENV{'form.highlight'}) {
963: map {
964: my $anchorname=$_;
965: my $matchthis=$anchorname;
966: $matchthis=~s/\_+/\\s\+/g;
967: $result=~s/($matchthis)/\<font color=\"red\"\>$1\<\/font\>/gs;
968: } split(/\,/,$ENV{'form.highlight'});
969: }
970: if ($ENV{'form.link'}) {
971: map {
972: my ($anchorname,$linkurl)=split(/\>/,$_);
973: my $matchthis=$anchorname;
974: $matchthis=~s/\_+/\\s\+/g;
975: $result=~s/($matchthis)/\<a href=\"$linkurl\"\>$1\<\/a\>/gs;
976: } split(/\,/,$ENV{'form.link'});
977: }
978: if ($ENV{'form.anchor'}) {
979: my $anchorname=$ENV{'form.anchor'};
980: my $matchthis=$anchorname;
981: $matchthis=~s/\_+/\\s\+/g;
982: $result=~s/($matchthis)/\<a name=\"$anchorname\"\>$1\<\/a\>/s;
983: $result.=(<<"ENDSCRIPT");
984: <script>
985: document.location.hash='$anchorname';
986: </script>
987: ENDSCRIPT
988: }
989: return $result;
990: }
991:
992: sub storefile {
993: my ($file,$contents)=@_;
994: if (my $fh=Apache::File->new('>'.$file)) {
995: print $fh $contents;
996: $fh->close();
997: }
998: }
999:
1000: sub inserteditinfo {
1001: my ($result,$filecontents)=@_;
1002: unless ($filecontents) {
1003: $filecontents=(<<SIMPLECONTENT);
1004: <html>
1005: <head>
1006: <title>
1007: Title of Document Goes Here
1008: </title>
1009: </head>
1010: <body bgcolor="#FFFFFF">
1011:
1012: Body of Document Goes Here
1013:
1014: </body>
1015: </html>
1016: SIMPLECONTENT
1017: }
1018: my $editheader='<a href="#editsection">Edit below</a><hr />';
1019: my $editfooter=(<<ENDFOOTER);
1020: <hr />
1021: <a name="editsection" />
1022: <form method="post">
1023: <textarea cols="80" rows="40" name="filecont">$filecontents</textarea>
1024: <br />
1025: <input type="submit" name="attemptclean"
1026: value="Save and then attempt to clean HTML" />
1027: <input type="submit" name="savethisfile" value="Save this" />
1028: </form>
1029: ENDFOOTER
1030: $result=~s/(\<body[^\>]*\>)/$1$editheader/is;
1031: $result=~s/(\<\/body\>)/$editfooter/is;
1032: return $result;
1033: }
1034:
1035: sub handler {
1036: my $request=shift;
1037:
1038: my $target='web';
1039:
1040: $Apache::lonxml::debug=0;
1041:
1042: if ($ENV{'browser.mathml'}) {
1043: $request->content_type('text/xml');
1044: } else {
1045: $request->content_type('text/html');
1046: }
1047: &Apache::loncommon::no_cache($request);
1048: $request->send_http_header;
1049:
1050: return OK if $request->header_only;
1051:
1052:
1053: my $file=&Apache::lonnet::filelocation("",$request->uri);
1054: #
1055: # Edit action? Save file.
1056: #
1057: unless ($ENV{'request.state'} eq 'published') {
1058: if (($ENV{'form.savethisfile'}) || ($ENV{'form.attemptclean'})) {
1059: &storefile($file,$ENV{'form.filecont'});
1060: }
1061: }
1062: my %mystyle;
1063: my $result = '';
1064: my $filecontents=&Apache::lonnet::getfile($file);
1065: if ($filecontents == -1) {
1066: $result=(<<ENDNOTFOUND);
1067: <html>
1068: <head>
1069: <title>File not found</title>
1070: </head>
1071: <body bgcolor="#FFFFFF">
1072: <b>File not found: $file</b>
1073: </body>
1074: </html>
1075: ENDNOTFOUND
1076: $filecontents='';
1077: } else {
1078: unless ($ENV{'request.state'} eq 'published') {
1079: if ($ENV{'form.attemptclean'}) {
1080: $filecontents=&htmlclean($filecontents,1);
1081: }
1082: }
1083: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
1084: }
1085:
1086: #
1087: # Edit action? Insert editing commands
1088: #
1089: unless ($ENV{'request.state'} eq 'published') {
1090: $result=&inserteditinfo($result,$filecontents);
1091: }
1092:
1093: writeallows($request->uri);
1094:
1095: $request->print($result);
1096:
1097: return OK;
1098: }
1099:
1100: sub debug {
1101: if ($Apache::lonxml::debug eq 1) {
1102: print("DEBUG:".$_[0]."<br />\n");
1103: }
1104: }
1105:
1106: sub error {
1107: if (($Apache::lonxml::debug eq 1) || ($ENV{'request.state'} eq 'construct') ) {
1108: print "<b>ERROR:</b>".$_[0]."<br />\n";
1109: } else {
1110: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
1111: #notify author
1112: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
1113: #notify course
1114: if ( $ENV{'request.course.id'} ) {
1115: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
1116: foreach my $user (split /\,/, $users) {
1117: ($user,my $domain) = split /:/, $user;
1118: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
1119: }
1120: }
1121:
1122: #FIXME probably shouldn't have me get everything forever.
1123: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
1124: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
1125: }
1126: }
1127:
1128: sub warning {
1129: if ($ENV{'request.state'} eq 'construct') {
1130: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
1131: }
1132: }
1133:
1134: sub get_param {
1135: my ($param,$parstack,$safeeval,$context) = @_;
1136: if ( ! $context ) { $context = -1; }
1137: my $args ='';
1138: if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
1139: if ( $args =~ /my \$$param=\"/ ) {
1140: return &Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
1141: } else {
1142: return undef;
1143: }
1144: }
1145:
1146: sub get_param_var {
1147: my ($param,$parstack,$safeeval,$context) = @_;
1148: if ( ! $context ) { $context = -1; }
1149: my $args ='';
1150: if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
1151: if ( $args !~ /my \$$param=\"/ ) { return undef; }
1152: my $value=&Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
1153: if ($value =~ /^[\$\@\%]/) {
1154: return &Apache::run::run("return $value",$safeeval,1);
1155: } else {
1156: return $value;
1157: }
1158: }
1159:
1160: sub register_insert {
1161: my @data = split /\n/, &Apache::lonnet::getfile('/home/httpd/lonTabs/insertlist.tab');
1162: my $i;
1163: my $tagnum=0;
1164: my @order;
1165: for ($i=0;$i < $#data; $i++) {
1166: my $line = $data[$i];
1167: if ( $line =~ /^\#/ || $line =~ /^\s*\n/) { next; }
1168: if ( $line =~ /TABLE/ ) { last; }
1169: my ($tag,$descrip,$color,$function,$show) = split(/,/, $line);
1170: if ($tag) {
1171: $insertlist{"$tagnum.tag"} = $tag;
1172: $insertlist{"$tagnum.description"} = $descrip;
1173: $insertlist{"$tagnum.color"} = $color;
1174: $insertlist{"$tagnum.function"} = $function;
1175: if (!defined($show)) { $show='yes'; }
1176: $insertlist{"$tagnum.show"}= $show;
1177: $insertlist{"$tag.num"}=$tagnum;
1178: $tagnum++;
1179: }
1180: }
1181: $i++; #skipping TABLE line
1182: $tagnum = 0;
1183: for (;$i < $#data;$i++) {
1184: my $line = $data[$i];
1185: my ($mnemonic,@which) = split(/ +/,$line);
1186: my $tag = $insertlist{"$tagnum.tag"};
1187: for (my $j=0;$j <$#which;$j++) {
1188: if ( $which[$j] eq 'Y' ) {
1189: if ($insertlist{"$j.show"} ne 'no') {
1190: push(@{ $insertlist{"$tag.which"} },$j);
1191: }
1192: }
1193: }
1194: $tagnum++;
1195: }
1196: }
1197:
1198: sub description {
1199: my ($token)=@_;
1200: my $tagnum;
1201: my $tag=$token->[1];
1202: foreach my $namespace (reverse @Apache::lonxml::namespace) {
1203: my $testtag=$namespace.'::'.$tag;
1204: $tagnum=$insertlist{"$testtag.num"};
1205: if (defined($tagnum)) { last; }
1206: }
1207: if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
1208: return $insertlist{$tagnum.'.description'};
1209: }
1210:
1211: # ----------------------------------------------------------------- whichuser
1212: # returns a list of $symb, $courseid, $domain, $name that is correct for
1213: # calls to lonnet functions for this setup.
1214: # - looks for form.grade_ parameters
1215: sub whichuser {
1216: my ($symb,$courseid,$domain,$name);
1217: if (defined($ENV{'form.grade_symb'})) {
1218: my $tmp_courseid=$ENV{'form.grade_courseid'};
1219: my $allowed=&Apache::lonnet::allowed('mgr',$tmp_courseid);
1220: if ($allowed) {
1221: $symb=$ENV{'form.grade_symb'};
1222: $courseid=$ENV{'form.grade_courseid'};
1223: $domain=$ENV{'form.grade_domain'};
1224: $name=$ENV{'form.grade_username'};
1225: }
1226: } else {
1227: $symb=&Apache::lonnet::symbread();
1228: $courseid=$ENV{'request.course.id'};
1229: $domain=$ENV{'user.domain'};
1230: $name=$ENV{'user.name'};
1231: }
1232: return ($symb,$courseid,$domain,$name);
1233: }
1234:
1235: 1;
1236: __END__
1237:
1238:
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