1: # The LearningOnline Network with CAPA
2: # XML Parser Module
3: #
4: # $Id: lonxml.pm,v 1.411 2006/04/20 02:58:14 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:
40:
41: package Apache::lonxml;
42: use vars
43: qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace $errorcount $warningcount);
44: use strict;
45: use HTML::LCParser();
46: use HTML::TreeBuilder();
47: use HTML::Entities();
48: use Safe();
49: use Safe::Hole();
50: use Math::Cephes();
51: use Math::Random();
52: use Opcode();
53: use POSIX qw(strftime);
54: use Time::HiRes qw( gettimeofday tv_interval );
55: use Symbol();
56:
57: sub register {
58: my ($space,@taglist) = @_;
59: foreach my $temptag (@taglist) {
60: push(@{ $Apache::lonxml::alltags{$temptag} },$space);
61: }
62: }
63:
64: sub deregister {
65: my ($space,@taglist) = @_;
66: foreach my $temptag (@taglist) {
67: my $tempspace = $Apache::lonxml::alltags{$temptag}[-1];
68: if ($tempspace eq $space) {
69: pop(@{ $Apache::lonxml::alltags{$temptag} });
70: }
71: }
72: #&printalltags();
73: }
74:
75: use Apache::Constants qw(:common);
76: use Apache::lontexconvert();
77: use Apache::style();
78: use Apache::run();
79: use Apache::londefdef();
80: use Apache::scripttag();
81: use Apache::languagetags();
82: use Apache::edit();
83: use Apache::inputtags();
84: use Apache::outputtags();
85: use Apache::lonnet;
86: use Apache::File();
87: use Apache::loncommon();
88: use Apache::lonfeedback();
89: use Apache::lonmsg();
90: use Apache::loncacc();
91: use Apache::lonlocal;
92:
93: #================================================== Main subroutine: xmlparse
94: #debugging control, to turn on debugging modify the correct handler
95: $Apache::lonxml::debug=0;
96:
97: # keeps count of the number of warnings and errors generated in a parse
98: $warningcount=0;
99: $errorcount=0;
100:
101: #path to the directory containing the file currently being processed
102: @pwd=();
103:
104: #these two are used for capturing a subset of the output for later processing,
105: #don't touch them directly use &startredirection and &endredirection
106: @outputstack = ();
107: $redirection = 0;
108:
109: #controls wheter the <import> tag actually does
110: $import = 1;
111: @extlinks=();
112:
113: # meta mode is a bit weird only some output is to be turned off
114: #<output> tag turns metamode off (defined in londefdef.pm)
115: $metamode = 0;
116:
117: # turns on and of run::evaluate actually derefencing var refs
118: $evaluate = 1;
119:
120: # data structure for eidt mode, determines what tags can go into what other tags
121: %insertlist=();
122:
123: # stores the list of active tag namespaces
124: @namespace=();
125:
126: # a pointer the the Apache request object
127: $Apache::lonxml::request='';
128:
129: # a problem number counter, and check on ether it is used
130: $Apache::lonxml::counter=1;
131: $Apache::lonxml::counter_changed=0;
132:
133: #internal check on whether to look at style defs
134: $Apache::lonxml::usestyle=1;
135:
136: #locations used to store the parameter string for style substitutions
137: $Apache::lonxml::style_values='';
138: $Apache::lonxml::style_end_values='';
139:
140: #array of ssi calls that need to occur after we are done parsing
141: @Apache::lonxml::ssi_info=();
142:
143: #should we do the postag variable interpolation
144: $Apache::lonxml::post_evaluate=1;
145:
146: #a header message to emit in the case of any generated warning or errors
147: $Apache::lonxml::warnings_error_header='';
148:
149: # Control whether or not LaTeX symbols should be substituted for their
150: # \ style equivalents...this may be turned off e.g. in an verbatim
151: # environment.
152:
153: $Apache::lonxml::substitute_LaTeX_symbols = 1; # Starts out on.
154:
155: sub enable_LaTeX_substitutions {
156: $Apache::lonxml::substitute_LaTeX_symbols = 1;
157: }
158: sub disable_LaTeX_substitutions {
159: $Apache::lonxml::substitute_LaTeX_symbols = 0;
160: }
161:
162: sub xmlend {
163: my ($target,$parser)=@_;
164: my $mode='xml';
165: my $status='OPEN';
166: if ($Apache::lonhomework::parsing_a_problem ||
167: $Apache::lonhomework::parsing_a_task ) {
168: $mode='problem';
169: $status=$Apache::inputtags::status[-1];
170: }
171: my $discussion;
172: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
173: ['LONCAPA_INTERNAL_no_discussion']);
174: if (! exists($env{'form.LONCAPA_INTERNAL_no_discussion'}) ||
175: $env{'form.LONCAPA_INTERNAL_no_discussion'} ne 'true') {
176: $discussion=&Apache::lonfeedback::list_discussion($mode,$status);
177: }
178: if ($target eq 'tex') {
179: $discussion.='<tex>\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}\end{document}</tex>';
180: &Apache::lonxml::newparser($parser,\$discussion,'');
181: return '';
182: }
183:
184: return $discussion;
185: }
186:
187: sub tokeninputfield {
188: my $defhost=$Apache::lonnet::perlvar{'lonHostID'};
189: $defhost=~tr/a-z/A-Z/;
190: return (<<ENDINPUTFIELD)
191: <script type="text/javascript">
192: function updatetoken() {
193: var comp=new Array;
194: var barcode=unescape(document.tokeninput.barcode.value);
195: comp=barcode.split('*');
196: if (typeof(comp[0])!="undefined") {
197: document.tokeninput.codeone.value=comp[0];
198: }
199: if (typeof(comp[1])!="undefined") {
200: document.tokeninput.codetwo.value=comp[1];
201: }
202: if (typeof(comp[2])!="undefined") {
203: comp[2]=comp[2].toUpperCase();
204: document.tokeninput.codethree.value=comp[2];
205: }
206: document.tokeninput.barcode.value='';
207: }
208: </script>
209: <form method="post" name="tokeninput">
210: <table border="2" bgcolor="#FFFFBB">
211: <tr><th>DocID Checkin</th></tr>
212: <tr><td>
213: <table>
214: <tr>
215: <td>Scan in Barcode</td>
216: <td><input type="text" size="22" name="barcode"
217: onChange="updatetoken()"/></td>
218: </tr>
219: <tr><td><i>or</i> Type in DocID</td>
220: <td>
221: <input type="text" size="5" name="codeone" />
222: <b><font size="+2">*</font></b>
223: <input type="text" size="5" name="codetwo" />
224: <b><font size="+2">*</font></b>
225: <input type="text" size="10" name="codethree" value="$defhost"
226: onChange="this.value=this.value.toUpperCase()" />
227: </td></tr>
228: </table>
229: </td></tr>
230: <tr><td><input type="submit" value="Check in DocID" /></td></tr>
231: </table>
232: </form>
233: ENDINPUTFIELD
234: }
235:
236: sub maketoken {
237: my ($symb,$tuname,$tudom,$tcrsid)=@_;
238: unless ($symb) {
239: $symb=&Apache::lonnet::symbread();
240: }
241: unless ($tuname) {
242: $tuname=$env{'user.name'};
243: $tudom=$env{'user.domain'};
244: $tcrsid=$env{'request.course.id'};
245: }
246:
247: return &Apache::lonnet::checkout($symb,$tuname,$tudom,$tcrsid);
248: }
249:
250: sub printtokenheader {
251: my ($target,$token,$tsymb,$tcrsid,$tudom,$tuname)=@_;
252: unless ($token) { return ''; }
253:
254: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
255: unless ($tsymb) {
256: $tsymb=$symb;
257: }
258: unless ($tuname) {
259: $tuname=$name;
260: $tudom=$domain;
261: $tcrsid=$courseid;
262: }
263:
264: my $plainname=&Apache::loncommon::plainname($tuname,$tudom);
265:
266: if ($target eq 'web') {
267: my %idhash=&Apache::lonnet::idrget($tudom,($tuname));
268: return
269: '<img align="right" src="/cgi-bin/barcode.png?encode='.$token.'" />'.
270: &mt('Checked out for').' '.$plainname.
271: '<br />'.&mt('User').': '.$tuname.' at '.$tudom.
272: '<br />'.&mt('ID').': '.$idhash{$tuname}.
273: '<br />'.&mt('CourseID').': '.$tcrsid.
274: '<br />'.&mt('Course').': '.$env{'course.'.$tcrsid.'.description'}.
275: '<br />'.&mt('DocID').': '.$token.
276: '<br />'.&mt('Time').': '.&Apache::lonlocal::locallocaltime().'<hr />';
277: } else {
278: return $token;
279: }
280: }
281:
282: sub printalltags {
283: my $temp;
284: foreach $temp (sort keys %Apache::lonxml::alltags) {
285: &Apache::lonxml::debug("$temp -- ".
286: join(',',@{ $Apache::lonxml::alltags{$temp} }));
287: }
288: }
289:
290: sub xmlparse {
291: my ($request,$target,$content_file_string,$safeinit,%style_for_target) = @_;
292:
293: &setup_globals($request,$target);
294: &Apache::inputtags::initialize_inputtags();
295: &Apache::bridgetask::initialize_bridgetask();
296: &Apache::outputtags::initialize_outputtags();
297: &Apache::edit::initialize_edit();
298: &Apache::londefdef::initialize_londefdef();
299:
300: #
301: # do we have a course style file?
302: #
303:
304: if ($env{'request.course.id'} && $env{'request.state'} ne 'construct') {
305: my $bodytext=
306: $env{'course.'.$env{'request.course.id'}.'.default_xml_style'};
307: if ($bodytext) {
308: foreach my $file (split(',',$bodytext)) {
309: my $location=&Apache::lonnet::filelocation('',$file);
310: my $styletext=&Apache::lonnet::getfile($location);
311: if ($styletext ne '-1') {
312: %style_for_target = (%style_for_target,
313: &Apache::style::styleparser($target,$styletext));
314: }
315: }
316: }
317: } elsif ($env{'construct.style'} && ($env{'request.state'} eq 'construct')) {
318: my $location=&Apache::lonnet::filelocation('',$env{'construct.style'});
319: my $styletext=&Apache::lonnet::getfile($location);
320: if ($styletext ne '-1') {
321: %style_for_target = (%style_for_target,
322: &Apache::style::styleparser($target,$styletext));
323: }
324: }
325: #&printalltags();
326: my @pars = ();
327: my $pwd=$env{'request.filename'};
328: $pwd =~ s:/[^/]*$::;
329: &newparser(\@pars,\$content_file_string,$pwd);
330:
331: my $safeeval = new Safe;
332: my $safehole = new Safe::Hole;
333: &init_safespace($target,$safeeval,$safehole,$safeinit);
334: #-------------------- Redefinition of the target in the case of compound target
335:
336: ($target, my @tenta) = split('&&',$target);
337:
338: my @stack = ();
339: my @parstack = ();
340: &initdepth();
341: &init_alarm();
342: my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars,
343: $safeeval,\%style_for_target,1);
344:
345: if ($env{'request.uri'}) {
346: &writeallows($env{'request.uri'});
347: }
348: &do_registered_ssi();
349: if ($Apache::lonxml::counter_changed) { &store_counter() }
350:
351: &clean_safespace($safeeval);
352:
353: if ($env{'form.return_only_error_and_warning_counts'}) {
354: return "$errorcount:$warningcount";
355: }
356: return $finaloutput;
357: }
358:
359: sub latex_special_symbols {
360: my ($string,$where)=@_;
361: #
362: # If e.g. in verbatim mode, then don't substitute.
363: # but return original string.
364: #
365: if (!($Apache::lonxml::substitute_LaTeX_symbols)) {
366: return $string;
367: }
368: if ($where eq 'header') {
369: $string =~ s/(\\|_|\^)/ /g;
370: $string =~ s/(\$|%|\{|\})/\\$1/g;
371: $string =~ s/_/ /g;
372: $string=&Apache::lonprintout::character_chart($string);
373: # any & or # leftover should be safe to just escape
374: $string=~s/([^\\])\&/$1\\\&/g;
375: $string=~s/([^\\])\#/$1\\\#/g;
376: } else {
377: $string=~s/\\/\\ensuremath{\\backslash}/g;
378: $string=~s/\\\%|\%/\\\%/g;
379: $string=~s/\\{|{/\\{/g;
380: $string=~s/\\}|}/\\}/g;
381: $string=~s/\\ensuremath\\{\\backslash\\}/\\ensuremath{\\backslash}/g;
382: $string=~s/\\\$|\$/\\\$/g;
383: $string=~s/\\\_|\_/\\\_/g;
384: $string=~s/([^\\]|^)(\~|\^)/$1\\$2\\strut /g;
385: $string=~s/(>|<)/\\ensuremath\{$1\}/g; #more or less
386: $string=&Apache::lonprintout::character_chart($string);
387: # any & or # leftover should be safe to just escape
388: $string=~s/\\\&|\&/\\\&/g;
389: $string=~s/\\\#|\#/\\\#/g;
390: $string=~s/\|/\$\\mid\$/g;
391: #single { or } How to escape?
392: }
393: return $string;
394: }
395:
396: sub inner_xmlparse {
397: my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target,$start)=@_;
398: my $finaloutput = '';
399: my $result;
400: my $token;
401: my $dontpop=0;
402: my $startredirection = $Apache::lonxml::redirection;
403: while ( $#$pars > -1 ) {
404: while ($token = $$pars['-1']->get_token) {
405: if (($token->[0] eq 'T') || ($token->[0] eq 'C') ) {
406: if ($metamode<1) {
407: my $text=$token->[1];
408: if ($token->[0] eq 'C' && $target eq 'tex') {
409: $text = '';
410: # $text = '%'.$text."\n";
411: }
412: $result.=$text;
413: }
414: } elsif (($token->[0] eq 'D')) {
415: if ($metamode<1 && $target eq 'web') {
416: my $text=$token->[1];
417: $result.=$text;
418: }
419: } elsif ($token->[0] eq 'PI') {
420: if ($metamode<1 && $target eq 'web') {
421: $result=$token->[2];
422: }
423: } elsif ($token->[0] eq 'S') {
424: # add tag to stack
425: push (@$stack,$token->[1]);
426: # add parameters list to another stack
427: push (@$parstack,&parstring($token));
428: &increasedepth($token);
429: if ($Apache::lonxml::usestyle &&
430: exists($$style_for_target{$token->[1]})) {
431: $Apache::lonxml::usestyle=0;
432: my $string=$$style_for_target{$token->[1]}.
433: '<LONCAPA_INTERNAL_TURN_STYLE_ON />';
434: &Apache::lonxml::newparser($pars,\$string);
435: $Apache::lonxml::style_values=$$parstack[-1];
436: $Apache::lonxml::style_end_values=$$parstack[-1];
437: } else {
438: $result = &callsub("start_$token->[1]", $target, $token, $stack,
439: $parstack, $pars, $safeeval, $style_for_target);
440: }
441: } elsif ($token->[0] eq 'E') {
442: if ($Apache::lonxml::usestyle &&
443: exists($$style_for_target{'/'."$token->[1]"})) {
444: $Apache::lonxml::usestyle=0;
445: my $string=$$style_for_target{'/'.$token->[1]}.
446: '<LONCAPA_INTERNAL_TURN_STYLE_ON end="'.$token->[1].'" />';
447: &Apache::lonxml::newparser($pars,\$string);
448: $Apache::lonxml::style_values=$Apache::lonxml::style_end_values;
449: $Apache::lonxml::style_end_values='';
450: $dontpop=1;
451: } else {
452: #clear out any tags that didn't end
453: while ($token->[1] ne $$stack['-1'] && ($#$stack > -1)) {
454: my $lasttag=$$stack[-1];
455: if ($token->[1] =~ /^\Q$lasttag\E$/i) {
456: &Apache::lonxml::warning('Using tag </'.$token->[1].'> on line '.$token->[3].' as end tag to <'.$$stack[-1].'>');
457: last;
458: } else {
459: &Apache::lonxml::warning('Found tag </'.$token->[1].'> on line '.$token->[3].' when looking for </'.$$stack[-1].'> in file');
460: &end_tag($stack,$parstack,$token);
461: }
462: }
463: $result = &callsub("end_$token->[1]", $target, $token, $stack,
464: $parstack, $pars,$safeeval, $style_for_target);
465: }
466: } else {
467: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
468: }
469: #evaluate variable refs in result
470: if ($Apache::lonxml::post_evaluate &&$result ne "") {
471: my $extras;
472: if (!$Apache::lonxml::usestyle) {
473: $extras=$Apache::lonxml::style_values;
474: }
475: if ( $#$parstack > -1 ) {
476: $result=&Apache::run::evaluate($result,$safeeval,$extras.$$parstack[-1]);
477: } else {
478: $result= &Apache::run::evaluate($result,$safeeval,$extras);
479: }
480: }
481: $Apache::lonxml::post_evaluate=1;
482:
483: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
484: #Style file definitions should be correct
485: if ($target eq 'tex' && ($Apache::lonxml::usestyle)) {
486: $result=&latex_special_symbols($result);
487: }
488: }
489:
490: if ($Apache::lonxml::redirection) {
491: $Apache::lonxml::outputstack['-1'] .= $result;
492: } else {
493: $finaloutput.=$result;
494: }
495: $result = '';
496:
497: if ($token->[0] eq 'E' && !$dontpop) {
498: &end_tag($stack,$parstack,$token);
499: }
500: $dontpop=0;
501: }
502: if ($#$pars > -1) {
503: pop @$pars;
504: pop @Apache::lonxml::pwd;
505: }
506: }
507:
508: # if ($target eq 'meta') {
509: # $finaloutput.=&endredirection;
510: # }
511:
512: if ( $start && $target eq 'grade') { &endredirection(); }
513: if ( $Apache::lonxml::redirection > $startredirection) {
514: while ($Apache::lonxml::redirection > $startredirection) {
515: $finaloutput .= &endredirection();
516: }
517: }
518: if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) {
519: $finaloutput=&afterburn($finaloutput);
520: }
521: return $finaloutput;
522: }
523:
524: ##
525: ## Looks to see if there is a subroutine defined for this tag. If so, call it,
526: ## otherwise do not call it as we do not know what it is.
527: ##
528: sub callsub {
529: my ($sub,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
530: my $currentstring='';
531: my $nodefault;
532: {
533: my $sub1;
534: no strict 'refs';
535: my $tag=$token->[1];
536: # get utterly rid of extended html tags
537: if ($tag=~/^x\-/i) { return ''; }
538: my $space=$Apache::lonxml::alltags{$tag}[-1];
539: if (!$space) {
540: $tag=~tr/A-Z/a-z/;
541: $sub=~tr/A-Z/a-z/;
542: $space=$Apache::lonxml::alltags{$tag}[-1]
543: }
544:
545: my $deleted=0;
546: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
547: if (($token->[0] eq 'S') && ($target eq 'modified')) {
548: $deleted=&Apache::edit::handle_delete($space,$target,$token,$tagstack,
549: $parstack,$parser,$safeeval,
550: $style);
551: }
552: if (!$deleted) {
553: if ($space) {
554: #&Apache::lonxml::debug("Calling sub $sub in $space $metamode");
555: $sub1="$space\:\:$sub";
556: ($currentstring,$nodefault) = &$sub1($target,$token,$tagstack,
557: $parstack,$parser,$safeeval,
558: $style);
559: } else {
560: if ($target eq 'tex') {
561: # throw away tag name
562: return '';
563: }
564: #&Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode");
565: if ($metamode <1) {
566: if (defined($token->[4]) && ($metamode < 1)) {
567: $currentstring = $token->[4];
568: } else {
569: $currentstring = $token->[2];
570: }
571: }
572: }
573: # &Apache::lonxml::debug("nodefalt:$nodefault:");
574: if ($currentstring eq '' && $nodefault eq '') {
575: if ($target eq 'edit') {
576: #&Apache::lonxml::debug("doing default edit for $token->[1]");
577: if ($token->[0] eq 'S') {
578: $currentstring = &Apache::edit::tag_start($target,$token);
579: } elsif ($token->[0] eq 'E') {
580: $currentstring = &Apache::edit::tag_end($target,$token);
581: }
582: } elsif ($target eq 'modified') {
583: if ($token->[0] eq 'S') {
584: $currentstring = $token->[4];
585: $currentstring.=&Apache::edit::handle_insert();
586: } elsif ($token->[0] eq 'E') {
587: $currentstring = $token->[2];
588: $currentstring.=&Apache::edit::handle_insertafter($token->[1]);
589: } else {
590: $currentstring = $token->[2];
591: }
592: }
593: }
594: }
595: use strict 'refs';
596: }
597: return $currentstring;
598: }
599:
600: sub setup_globals {
601: my ($request,$target)=@_;
602: $Apache::lonxml::request=$request;
603: $errorcount=0;
604: $warningcount=0;
605: $Apache::lonxml::default_homework_loaded=0;
606: $Apache::lonxml::usestyle=1;
607: &init_counter();
608: @Apache::lonxml::pwd=();
609: @Apache::lonxml::extlinks=();
610: @Apache::lonxml::ssi_info=();
611: $Apache::lonxml::post_evaluate=1;
612: $Apache::lonxml::warnings_error_header='';
613: $Apache::lonxml::substitute_LaTeX_symbols = 1;
614: if ($target eq 'meta') {
615: $Apache::lonxml::redirection = 0;
616: $Apache::lonxml::metamode = 1;
617: $Apache::lonxml::evaluate = 1;
618: $Apache::lonxml::import = 0;
619: } elsif ($target eq 'answer') {
620: $Apache::lonxml::redirection = 0;
621: $Apache::lonxml::metamode = 1;
622: $Apache::lonxml::evaluate = 1;
623: $Apache::lonxml::import = 1;
624: } elsif ($target eq 'grade') {
625: &startredirection(); #ended in inner_xmlparse on exit
626: $Apache::lonxml::metamode = 0;
627: $Apache::lonxml::evaluate = 1;
628: $Apache::lonxml::import = 1;
629: } elsif ($target eq 'modified') {
630: $Apache::lonxml::redirection = 0;
631: $Apache::lonxml::metamode = 0;
632: $Apache::lonxml::evaluate = 0;
633: $Apache::lonxml::import = 0;
634: } elsif ($target eq 'edit') {
635: $Apache::lonxml::redirection = 0;
636: $Apache::lonxml::metamode = 0;
637: $Apache::lonxml::evaluate = 0;
638: $Apache::lonxml::import = 0;
639: } elsif ($target eq 'analyze') {
640: $Apache::lonxml::redirection = 0;
641: $Apache::lonxml::metamode = 0;
642: $Apache::lonxml::evaluate = 1;
643: $Apache::lonxml::import = 1;
644: } else {
645: $Apache::lonxml::redirection = 0;
646: $Apache::lonxml::metamode = 0;
647: $Apache::lonxml::evaluate = 1;
648: $Apache::lonxml::import = 1;
649: }
650: }
651:
652: sub init_safespace {
653: my ($target,$safeeval,$safehole,$safeinit) = @_;
654: $safeeval->deny_only(':dangerous');
655: $safeeval->reval('use Math::Complex;');
656: $safeeval->permit_only(":default");
657: $safeeval->permit("entereval");
658: $safeeval->permit(":base_math");
659: $safeeval->permit("sort");
660: $safeeval->permit("time");
661: $safeeval->deny("rand");
662: $safeeval->deny("srand");
663: $safeeval->deny(":base_io");
664: $safehole->wrap(\&Apache::scripttag::xmlparse,$safeeval,'&xmlparse');
665: $safehole->wrap(\&Apache::outputtags::multipart,$safeeval,'&multipart');
666: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
667: $safehole->wrap(\&Apache::chemresponse::chem_standard_order,$safeeval,
668: '&chem_standard_order');
669: $safehole->wrap(\&Apache::response::check_status,$safeeval,'&check_status');
670:
671: $safehole->wrap(\&Math::Cephes::asin,$safeeval,'&asin');
672: $safehole->wrap(\&Math::Cephes::acos,$safeeval,'&acos');
673: $safehole->wrap(\&Math::Cephes::atan,$safeeval,'&atan');
674: $safehole->wrap(\&Math::Cephes::sinh,$safeeval,'&sinh');
675: $safehole->wrap(\&Math::Cephes::cosh,$safeeval,'&cosh');
676: $safehole->wrap(\&Math::Cephes::tanh,$safeeval,'&tanh');
677: $safehole->wrap(\&Math::Cephes::asinh,$safeeval,'&asinh');
678: $safehole->wrap(\&Math::Cephes::acosh,$safeeval,'&acosh');
679: $safehole->wrap(\&Math::Cephes::atanh,$safeeval,'&atanh');
680: $safehole->wrap(\&Math::Cephes::erf,$safeeval,'&erf');
681: $safehole->wrap(\&Math::Cephes::erfc,$safeeval,'&erfc');
682: $safehole->wrap(\&Math::Cephes::j0,$safeeval,'&j0');
683: $safehole->wrap(\&Math::Cephes::j1,$safeeval,'&j1');
684: $safehole->wrap(\&Math::Cephes::jn,$safeeval,'&jn');
685: $safehole->wrap(\&Math::Cephes::jv,$safeeval,'&jv');
686: $safehole->wrap(\&Math::Cephes::y0,$safeeval,'&y0');
687: $safehole->wrap(\&Math::Cephes::y1,$safeeval,'&y1');
688: $safehole->wrap(\&Math::Cephes::yn,$safeeval,'&yn');
689: $safehole->wrap(\&Math::Cephes::yv,$safeeval,'&yv');
690:
691: $safehole->wrap(\&Math::Cephes::bdtr ,$safeeval,'&bdtr' );
692: $safehole->wrap(\&Math::Cephes::bdtrc ,$safeeval,'&bdtrc' );
693: $safehole->wrap(\&Math::Cephes::bdtri ,$safeeval,'&bdtri' );
694: $safehole->wrap(\&Math::Cephes::btdtr ,$safeeval,'&btdtr' );
695: $safehole->wrap(\&Math::Cephes::chdtr ,$safeeval,'&chdtr' );
696: $safehole->wrap(\&Math::Cephes::chdtrc,$safeeval,'&chdtrc');
697: $safehole->wrap(\&Math::Cephes::chdtri,$safeeval,'&chdtri');
698: $safehole->wrap(\&Math::Cephes::fdtr ,$safeeval,'&fdtr' );
699: $safehole->wrap(\&Math::Cephes::fdtrc ,$safeeval,'&fdtrc' );
700: $safehole->wrap(\&Math::Cephes::fdtri ,$safeeval,'&fdtri' );
701: $safehole->wrap(\&Math::Cephes::gdtr ,$safeeval,'&gdtr' );
702: $safehole->wrap(\&Math::Cephes::gdtrc ,$safeeval,'&gdtrc' );
703: $safehole->wrap(\&Math::Cephes::nbdtr ,$safeeval,'&nbdtr' );
704: $safehole->wrap(\&Math::Cephes::nbdtrc,$safeeval,'&nbdtrc');
705: $safehole->wrap(\&Math::Cephes::nbdtri,$safeeval,'&nbdtri');
706: $safehole->wrap(\&Math::Cephes::ndtr ,$safeeval,'&ndtr' );
707: $safehole->wrap(\&Math::Cephes::ndtri ,$safeeval,'&ndtri' );
708: $safehole->wrap(\&Math::Cephes::pdtr ,$safeeval,'&pdtr' );
709: $safehole->wrap(\&Math::Cephes::pdtrc ,$safeeval,'&pdtrc' );
710: $safehole->wrap(\&Math::Cephes::pdtri ,$safeeval,'&pdtri' );
711: $safehole->wrap(\&Math::Cephes::stdtr ,$safeeval,'&stdtr' );
712: $safehole->wrap(\&Math::Cephes::stdtri,$safeeval,'&stdtri');
713:
714: $safehole->wrap(\&Math::Cephes::Matrix::mat,$safeeval,'&mat');
715: $safehole->wrap(\&Math::Cephes::Matrix::new,$safeeval,
716: '&Math::Cephes::Matrix::new');
717: $safehole->wrap(\&Math::Cephes::Matrix::coef,$safeeval,
718: '&Math::Cephes::Matrix::coef');
719: $safehole->wrap(\&Math::Cephes::Matrix::clr,$safeeval,
720: '&Math::Cephes::Matrix::clr');
721: $safehole->wrap(\&Math::Cephes::Matrix::add,$safeeval,
722: '&Math::Cephes::Matrix::add');
723: $safehole->wrap(\&Math::Cephes::Matrix::sub,$safeeval,
724: '&Math::Cephes::Matrix::sub');
725: $safehole->wrap(\&Math::Cephes::Matrix::mul,$safeeval,
726: '&Math::Cephes::Matrix::mul');
727: $safehole->wrap(\&Math::Cephes::Matrix::div,$safeeval,
728: '&Math::Cephes::Matrix::div');
729: $safehole->wrap(\&Math::Cephes::Matrix::inv,$safeeval,
730: '&Math::Cephes::Matrix::inv');
731: $safehole->wrap(\&Math::Cephes::Matrix::transp,$safeeval,
732: '&Math::Cephes::Matrix::transp');
733: $safehole->wrap(\&Math::Cephes::Matrix::simq,$safeeval,
734: '&Math::Cephes::Matrix::simq');
735: $safehole->wrap(\&Math::Cephes::Matrix::mat_to_vec,$safeeval,
736: '&Math::Cephes::Matrix::mat_to_vec');
737: $safehole->wrap(\&Math::Cephes::Matrix::vec_to_mat,$safeeval,
738: '&Math::Cephes::Matrix::vec_to_mat');
739: $safehole->wrap(\&Math::Cephes::Matrix::check,$safeeval,
740: '&Math::Cephes::Matrix::check');
741: $safehole->wrap(\&Math::Cephes::Matrix::check,$safeeval,
742: '&Math::Cephes::Matrix::check');
743:
744: # $safehole->wrap(\&Math::Cephes::new_fract,$safeeval,'&new_fract');
745: # $safehole->wrap(\&Math::Cephes::radd,$safeeval,'&radd');
746: # $safehole->wrap(\&Math::Cephes::rsub,$safeeval,'&rsub');
747: # $safehole->wrap(\&Math::Cephes::rmul,$safeeval,'&rmul');
748: # $safehole->wrap(\&Math::Cephes::rdiv,$safeeval,'&rdiv');
749: # $safehole->wrap(\&Math::Cephes::euclid,$safeeval,'&euclid');
750:
751: $safehole->wrap(\&Math::Random::random_beta,$safeeval,'&math_random_beta');
752: $safehole->wrap(\&Math::Random::random_chi_square,$safeeval,'&math_random_chi_square');
753: $safehole->wrap(\&Math::Random::random_exponential,$safeeval,'&math_random_exponential');
754: $safehole->wrap(\&Math::Random::random_f,$safeeval,'&math_random_f');
755: $safehole->wrap(\&Math::Random::random_gamma,$safeeval,'&math_random_gamma');
756: $safehole->wrap(\&Math::Random::random_multivariate_normal,$safeeval,'&math_random_multivariate_normal');
757: $safehole->wrap(\&Math::Random::random_multinomial,$safeeval,'&math_random_multinomial');
758: $safehole->wrap(\&Math::Random::random_noncentral_chi_square,$safeeval,'&math_random_noncentral_chi_square');
759: $safehole->wrap(\&Math::Random::random_noncentral_f,$safeeval,'&math_random_noncentral_f');
760: $safehole->wrap(\&Math::Random::random_normal,$safeeval,'&math_random_normal');
761: $safehole->wrap(\&Math::Random::random_permutation,$safeeval,'&math_random_permutation');
762: $safehole->wrap(\&Math::Random::random_permuted_index,$safeeval,'&math_random_permuted_index');
763: $safehole->wrap(\&Math::Random::random_uniform,$safeeval,'&math_random_uniform');
764: $safehole->wrap(\&Math::Random::random_poisson,$safeeval,'&math_random_poisson');
765: $safehole->wrap(\&Math::Random::random_uniform_integer,$safeeval,'&math_random_uniform_integer');
766: $safehole->wrap(\&Math::Random::random_negative_binomial,$safeeval,'&math_random_negative_binomial');
767: $safehole->wrap(\&Math::Random::random_binomial,$safeeval,'&math_random_binomial');
768: $safehole->wrap(\&Math::Random::random_seed_from_phrase,$safeeval,'&random_seed_from_phrase');
769: $safehole->wrap(\&Math::Random::random_set_seed_from_phrase,$safeeval,'&random_set_seed_from_phrase');
770: $safehole->wrap(\&Math::Random::random_get_seed,$safeeval,'&random_get_seed');
771: $safehole->wrap(\&Math::Random::random_set_seed,$safeeval,'&random_set_seed');
772: $safehole->wrap(\&Apache::lonxml::error,$safeeval,'&LONCAPA_INTERNAL_ERROR');
773: $safehole->wrap(\&Apache::lonxml::debug,$safeeval,'&LONCAPA_INTERNAL_DEBUG');
774: $safehole->wrap(\&Apache::caparesponse::get_sigrange,$safeeval,'&LONCAPA_INTERNAL_get_sigrange');
775:
776: #need to inspect this class of ops
777: # $safeeval->deny(":base_orig");
778: $safeeval->permit("require");
779: $safeinit .= ';$external::target="'.$target.'";';
780: &Apache::run::run($safeinit,$safeeval);
781: &initialize_rndseed($safeeval);
782: }
783:
784: sub clean_safespace {
785: my ($safeeval) = @_;
786: delete_package_recurse($safeeval->{Root});
787: }
788:
789: sub delete_package_recurse {
790: my ($package) = @_;
791: my @subp;
792: {
793: no strict 'refs';
794: while (my ($key,$val) = each(%{*{"$package\::"}})) {
795: if (!defined($val)) { next; }
796: local (*ENTRY) = $val;
797: if (defined *ENTRY{HASH} && $key =~ /::$/ &&
798: $key ne "main::" && $key ne "<none>::")
799: {
800: my ($p) = $package ne "main" ? "$package\::" : "";
801: ($p .= $key) =~ s/::$//;
802: push(@subp,$p);
803: }
804: }
805: }
806: foreach my $p (@subp) {
807: delete_package_recurse($p);
808: }
809: Symbol::delete_package($package);
810: }
811:
812: sub initialize_rndseed {
813: my ($safeeval)=@_;
814: my $rndseed;
815: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
816: $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name);
817: my $safeinit = '$external::randomseed="'.$rndseed.'";';
818: &Apache::lonxml::debug("Setting rndseed to $rndseed");
819: &Apache::run::run($safeinit,$safeeval);
820: }
821:
822: sub default_homework_load {
823: my ($safeeval)=@_;
824: &Apache::lonxml::debug('Loading default_homework');
825: my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
826: if ($default eq -1) {
827: &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
828: } else {
829: &Apache::run::run($default,$safeeval);
830: $Apache::lonxml::default_homework_loaded=1;
831: }
832: }
833:
834: {
835: my $alarm_depth;
836: sub init_alarm {
837: alarm(0);
838: $alarm_depth=0;
839: }
840:
841: sub start_alarm {
842: if ($alarm_depth<1) {
843: my $old=alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
844: if ($old) {
845: &Apache::lonxml::error("Cancelled an alarm of $old, this shouldn't occur.");
846: }
847: }
848: $alarm_depth++;
849: }
850:
851: sub end_alarm {
852: $alarm_depth--;
853: if ($alarm_depth<1) { alarm(0); }
854: }
855: }
856: my $metamode_was;
857: sub startredirection {
858: if (!$Apache::lonxml::redirection) {
859: $metamode_was=$Apache::lonxml::metamode;
860: }
861: $Apache::lonxml::metamode=0;
862: $Apache::lonxml::redirection++;
863: push (@Apache::lonxml::outputstack, '');
864: }
865:
866: sub endredirection {
867: if (!$Apache::lonxml::redirection) {
868: &Apache::lonxml::error("Endredirection was called before a startredirection, perhaps you have unbalanced tags. Some debugging information:".join ":",caller);
869: return '';
870: }
871: $Apache::lonxml::redirection--;
872: if (!$Apache::lonxml::redirection) {
873: $Apache::lonxml::metamode=$metamode_was;
874: }
875: pop @Apache::lonxml::outputstack;
876: }
877:
878: sub end_tag {
879: my ($tagstack,$parstack,$token)=@_;
880: pop(@$tagstack);
881: pop(@$parstack);
882: &decreasedepth($token);
883: }
884:
885: sub initdepth {
886: @Apache::lonxml::depthcounter=();
887: $Apache::lonxml::depth=-1;
888: $Apache::lonxml::olddepth=-1;
889: }
890:
891: my @timers;
892: my $lasttime;
893: sub increasedepth {
894: my ($token) = @_;
895: $Apache::lonxml::depth++;
896: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
897: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
898: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
899: }
900: my $time;
901: if ($Apache::lonxml::debug eq "1") {
902: push(@timers,[&gettimeofday()]);
903: $time=&tv_interval($lasttime);
904: $lasttime=[&gettimeofday()];
905: }
906: my $spacing=' 'x($Apache::lonxml::depth-1);
907: my $curdepth=join('_',@Apache::lonxml::depthcounter);
908: &Apache::lonxml::debug("s$spacing$Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1] : $time : \n");
909: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
910: }
911:
912: sub decreasedepth {
913: my ($token) = @_;
914: $Apache::lonxml::depth--;
915: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
916: $#Apache::lonxml::depthcounter--;
917: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
918: }
919: if ( $Apache::lonxml::depth < -1) {
920: &Apache::lonxml::warning(&mt("Missing tags, unable to properly run file."));
921: $Apache::lonxml::depth='-1';
922: }
923: my ($timer,$time);
924: if ($Apache::lonxml::debug eq "1") {
925: $timer=pop(@timers);
926: $time=&tv_interval($lasttime);
927: $lasttime=[&gettimeofday()];
928: }
929: my $spacing=' 'x$Apache::lonxml::depth;
930: my $curdepth=join('_',@Apache::lonxml::depthcounter);
931: &Apache::lonxml::debug("e$spacing$Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1] : $time : ".&tv_interval($timer)."\n");
932: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
933: }
934:
935: sub get_id {
936: my ($parstack,$safeeval)=@_;
937: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
938: if ($env{'request.state'} eq 'construct' && $id =~ /(\.|_)/) {
939: &error(&mt("IDs are not allowed to contain "<tt>_</tt>" or "<tt>.</tt>""));
940: }
941: if ($id =~ /^\s*$/) { $id = $Apache::lonxml::curdepth; }
942: return $id;
943: }
944:
945: sub get_all_text_unbalanced {
946: #there is a copy of this in lonpublisher.pm
947: my($tag,$pars)= @_;
948: my $token;
949: my $result='';
950: $tag='<'.$tag.'>';
951: while ($token = $$pars[-1]->get_token) {
952: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
953: if ($token->[0] eq 'T' && $token->[2]) {
954: $result.='<![CDATA['.$token->[1].']]>';
955: } else {
956: $result.=$token->[1];
957: }
958: } elsif ($token->[0] eq 'PI') {
959: $result.=$token->[2];
960: } elsif ($token->[0] eq 'S') {
961: $result.=$token->[4];
962: } elsif ($token->[0] eq 'E') {
963: $result.=$token->[2];
964: }
965: if ($result =~ /\Q$tag\E/is) {
966: ($result,my $redo)=$result =~ /(.*)\Q$tag\E(.*)/is;
967: #&Apache::lonxml::debug('Got a winner with leftovers ::'.$2);
968: #&Apache::lonxml::debug('Result is :'.$1);
969: $redo=$tag.$redo;
970: &Apache::lonxml::newparser($pars,\$redo);
971: last;
972: }
973: }
974: return $result
975: }
976:
977: sub increment_counter {
978: my ($increment) = @_;
979: if (defined($increment) && $increment gt 0) {
980: $Apache::lonxml::counter+=$increment;
981: } else {
982: $Apache::lonxml::counter++;
983: }
984: $Apache::lonxml::counter_changed=1;
985: }
986:
987: sub init_counter {
988: if ($env{'request.state'} eq 'construct') {
989: $Apache::lonxml::counter=1;
990: $Apache::lonxml::counter_changed=1;
991: } elsif (defined($env{'form.counter'})) {
992: $Apache::lonxml::counter=$env{'form.counter'};
993: $Apache::lonxml::counter_changed=0;
994: } else {
995: $Apache::lonxml::counter=1;
996: $Apache::lonxml::counter_changed=1;
997: }
998: }
999:
1000: sub store_counter {
1001: &Apache::lonnet::appenv(('form.counter' => $Apache::lonxml::counter));
1002: $Apache::lonxml::counter_changed=0;
1003: return '';
1004: }
1005:
1006: {
1007: my $state;
1008: sub clear_problem_counter {
1009: undef($state);
1010: &Apache::lonnet::delenv('form.counter');
1011: &Apache::lonxml::init_counter();
1012: &Apache::lonxml::store_counter();
1013: }
1014:
1015: sub remember_problem_counter {
1016: &Apache::lonnet::transfer_profile_to_env();
1017: $state = $env{'form.counter'};
1018: }
1019:
1020: sub restore_problem_counter {
1021: if (defined($state)) {
1022: &Apache::lonnet::appenv(('form.counter' => $state));
1023: }
1024: }
1025: sub get_problem_counter {
1026: if ($Apache::lonxml::counter_changed) { &store_counter() }
1027: &Apache::lonnet::transfer_profile_to_env();
1028: return $env{'form.counter'};
1029: }
1030: }
1031:
1032: sub get_all_text {
1033: my($tag,$pars,$style)= @_;
1034: my $gotfullstack=1;
1035: if (ref($pars) ne 'ARRAY') {
1036: $gotfullstack=0;
1037: $pars=[$pars];
1038: }
1039: if (ref($style) ne 'HASH') {
1040: $style={};
1041: }
1042: my $depth=0;
1043: my $token;
1044: my $result='';
1045: if ( $tag =~ m:^/: ) {
1046: my $tag=substr($tag,1);
1047: #&Apache::lonxml::debug("have:$tag:");
1048: my $top_empty=0;
1049: while (($depth >=0) && ($#$pars > -1) && (!$top_empty)) {
1050: while (($depth >=0) && ($token = $$pars[-1]->get_token)) {
1051: #&Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]:".$#$pars.":".$#Apache::lonxml::pwd);
1052: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
1053: if ($token->[2]) {
1054: $result.='<![CDATA['.$token->[1].']]>';
1055: } else {
1056: $result.=$token->[1];
1057: }
1058: } elsif ($token->[0] eq 'PI') {
1059: $result.=$token->[2];
1060: } elsif ($token->[0] eq 'S') {
1061: if ($token->[1] =~ /^\Q$tag\E$/i) { $depth++; }
1062: if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_ON$/) { $Apache::lonxml::usestyle=1; }
1063: if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_OFF$/) { $Apache::lonxml::usestyle=0; }
1064: $result.=$token->[4];
1065: } elsif ($token->[0] eq 'E') {
1066: if ( $token->[1] =~ /^\Q$tag\E$/i) { $depth--; }
1067: #skip sending back the last end tag
1068: if ($depth == 0 && exists($$style{'/'.$token->[1]}) && $Apache::lonxml::usestyle) {
1069: my $string=
1070: '<LONCAPA_INTERNAL_TURN_STYLE_OFF end="yes" />'.
1071: $$style{'/'.$token->[1]}.
1072: $token->[2].
1073: '<LONCAPA_INTERNAL_TURN_STYLE_ON />';
1074: &Apache::lonxml::newparser($pars,\$string);
1075: #&Apache::lonxml::debug("reParsing $string");
1076: next;
1077: }
1078: if ($depth > -1) {
1079: $result.=$token->[2];
1080: } else {
1081: $$pars[-1]->unget_token($token);
1082: }
1083: }
1084: }
1085: if (($depth >=0) && ($#$pars == 0) ) { $top_empty=1; }
1086: if (($depth >=0) && ($#$pars > 0) ) {
1087: pop(@$pars);
1088: pop(@Apache::lonxml::pwd);
1089: }
1090: }
1091: if ($top_empty && $depth >= 0) {
1092: #never found the end tag ran out of text, throw error send back blank
1093: &error('Never found end tag for <'.$tag.
1094: '> current string <pre>'.
1095: &HTML::Entities::encode($result,'<>&"').
1096: '</pre>');
1097: if ($gotfullstack) {
1098: my $newstring='</'.$tag.'>'.$result;
1099: &Apache::lonxml::newparser($pars,\$newstring);
1100: }
1101: $result='';
1102: }
1103: } else {
1104: while ($#$pars > -1) {
1105: while ($token = $$pars[-1]->get_token) {
1106: #&Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
1107: if (($token->[0] eq 'T')||($token->[0] eq 'C')||
1108: ($token->[0] eq 'D')) {
1109: if ($token->[2]) {
1110: $result.='<![CDATA['.$token->[1].']]>';
1111: } else {
1112: $result.=$token->[1];
1113: }
1114: } elsif ($token->[0] eq 'PI') {
1115: $result.=$token->[2];
1116: } elsif ($token->[0] eq 'S') {
1117: if ( $token->[1] =~ /^\Q$tag\E$/i) {
1118: $$pars[-1]->unget_token($token); last;
1119: } else {
1120: $result.=$token->[4];
1121: }
1122: if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_ON$/) { $Apache::lonxml::usestyle=1; }
1123: if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_OFF$/) { $Apache::lonxml::usestyle=0; }
1124: } elsif ($token->[0] eq 'E') {
1125: $result.=$token->[2];
1126: }
1127: }
1128: if (($#$pars > 0) ) {
1129: pop(@$pars);
1130: pop(@Apache::lonxml::pwd);
1131: } else { last; }
1132: }
1133: }
1134: #&Apache::lonxml::debug("Exit:$result:");
1135: return $result
1136: }
1137:
1138: sub newparser {
1139: my ($parser,$contentref,$dir) = @_;
1140: push (@$parser,HTML::LCParser->new($contentref));
1141: $$parser[-1]->xml_mode(1);
1142: $$parser[-1]->marked_sections(1);
1143: if ( $dir eq '' ) {
1144: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
1145: } else {
1146: push (@Apache::lonxml::pwd, $dir);
1147: }
1148: }
1149:
1150: sub parstring {
1151: my ($token) = @_;
1152: my $temp='';
1153: foreach (@{$token->[3]}) {
1154: unless ($_=~/\W/) {
1155: my $val=$token->[2]->{$_};
1156: $val =~ s/([\%\@\\\"\'])/\\$1/g;
1157: $val =~ s/(\$[^{a-zA-Z_])/\\$1/g;
1158: $val =~ s/(\$)$/\\$1/;
1159: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
1160: $temp .= "my \$$_=\"$val\";";
1161: }
1162: }
1163: return $temp;
1164: }
1165:
1166: sub extlink {
1167: my ($res,$exact)=@_;
1168: if (!$exact) {
1169: $res=&Apache::lonnet::hreflocation($Apache::lonxml::pwd[-1],$res);
1170: }
1171: push(@Apache::lonxml::extlinks,$res)
1172: }
1173:
1174: sub writeallows {
1175: unless ($#extlinks>=0) { return; }
1176: my $thisurl = &Apache::lonnet::clutter(shift);
1177: if ($env{'httpref.'.$thisurl}) {
1178: $thisurl=$env{'httpref.'.$thisurl};
1179: }
1180: my $thisdir=$thisurl;
1181: $thisdir=~s/\/[^\/]+$//;
1182: my %httpref=();
1183: foreach (@extlinks) {
1184: $httpref{'httpref.'.
1185: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl;
1186: }
1187: @extlinks=();
1188: &Apache::lonnet::appenv(%httpref);
1189: }
1190:
1191: sub register_ssi {
1192: my ($url,%form)=@_;
1193: push (@Apache::lonxml::ssi_info,{'url'=>$url,'form'=>\%form});
1194: return '';
1195: }
1196:
1197: sub do_registered_ssi {
1198: foreach my $info (@Apache::lonxml::ssi_info) {
1199: my %form=%{ $info->{'form'}};
1200: my $url=$info->{'url'};
1201: &Apache::lonnet::ssi($url,%form);
1202: }
1203: }
1204: #
1205: # Afterburner handles anchors, highlights and links
1206: #
1207: sub afterburn {
1208: my $result=shift;
1209: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1210: ['highlight','anchor','link']);
1211: if ($env{'form.highlight'}) {
1212: foreach (split(/\,/,$env{'form.highlight'})) {
1213: my $anchorname=$_;
1214: my $matchthis=$anchorname;
1215: $matchthis=~s/\_+/\\s\+/g;
1216: $result=~s/(\Q$matchthis\E)/\<font color=\"red\"\>$1\<\/font\>/gs;
1217: }
1218: }
1219: if ($env{'form.link'}) {
1220: foreach (split(/\,/,$env{'form.link'})) {
1221: my ($anchorname,$linkurl)=split(/\>/,$_);
1222: my $matchthis=$anchorname;
1223: $matchthis=~s/\_+/\\s\+/g;
1224: $result=~s/(\Q$matchthis\E)/\<a href=\"$linkurl\"\>$1\<\/a\>/gs;
1225: }
1226: }
1227: if ($env{'form.anchor'}) {
1228: my $anchorname=$env{'form.anchor'};
1229: my $matchthis=$anchorname;
1230: $matchthis=~s/\_+/\\s\+/g;
1231: $result=~s/(\Q$matchthis\E)/\<a name=\"$anchorname\"\>$1\<\/a\>/s;
1232: $result.=(<<"ENDSCRIPT");
1233: <script type="text/javascript">
1234: document.location.hash='$anchorname';
1235: </script>
1236: ENDSCRIPT
1237: }
1238: return $result;
1239: }
1240:
1241: sub storefile {
1242: my ($file,$contents)=@_;
1243: &Apache::lonnet::correct_line_ends(\$contents);
1244: if (my $fh=Apache::File->new('>'.$file)) {
1245: print $fh $contents;
1246: $fh->close();
1247: return 1;
1248: } else {
1249: &warning("Unable to save file $file");
1250: return 0;
1251: }
1252: }
1253:
1254: sub createnewhtml {
1255: my $title=&mt('Title of document goes here');
1256: my $body=&mt('Body of document goes here');
1257: my $filecontents=(<<SIMPLECONTENT);
1258: <html>
1259: <head>
1260: <title>$title</title>
1261: </head>
1262: <body bgcolor="#FFFFFF">
1263: $body
1264: </body>
1265: </html>
1266: SIMPLECONTENT
1267: return $filecontents;
1268: }
1269:
1270: sub createnewsty {
1271: my $filecontents=(<<SIMPLECONTENT);
1272: <definetag name="">
1273: <render>
1274: <web></web>
1275: <tex></tex>
1276: </render>
1277: </definetag>
1278: SIMPLECONTENT
1279: return $filecontents;
1280: }
1281:
1282:
1283: sub inserteditinfo {
1284: my ($result,$filecontents,$filetype)=@_;
1285: $filecontents = &HTML::Entities::encode($filecontents,'<>&"');
1286: # my $editheader='<a href="#editsection">Edit below</a><hr />';
1287: my $xml_help = '';
1288: my $initialize='';
1289: if ($filetype eq 'html') {
1290: my $addbuttons=&Apache::lonhtmlcommon::htmlareaaddbuttons();
1291: $initialize=&Apache::lonhtmlcommon::spellheader();
1292: if (!&Apache::lonhtmlcommon::htmlareablocked() &&
1293: &Apache::lonhtmlcommon::htmlareabrowser()) {
1294: $initialize.=(<<FULLPAGE);
1295: <script type="text/javascript">
1296: $addbuttons
1297:
1298: HTMLArea.loadPlugin("FullPage");
1299:
1300: function initDocument() {
1301: var editor=new HTMLArea("filecont",config);
1302: editor.registerPlugin(FullPage);
1303: editor.generate();
1304: }
1305: </script>
1306: FULLPAGE
1307: } else {
1308: $initialize.=(<<FULLPAGE);
1309: <script type="text/javascript">
1310: $addbuttons
1311: function initDocument() {
1312: }
1313: </script>
1314: FULLPAGE
1315: }
1316: $result=~s/\<body([^\>]*)\>/\<body onload="initDocument()" $1\>/i;
1317: $xml_help=&Apache::loncommon::helpLatexCheatsheet();
1318: }
1319: my $cleanbut = '';
1320:
1321: my $titledisplay=&display_title();
1322: my %lt=&Apache::lonlocal::texthash('st' => 'Save this',
1323: 'vi' => 'View',
1324: 'ed' => 'Edit');
1325: my $buttons=(<<BUTTONS);
1326: $cleanbut
1327: <input type="submit" name="savethisfile" accesskey="s" value="$lt{'st'}" />
1328: <input type="submit" name="viewmode" accesskey="v" value="$lt{'vi'}" />
1329: BUTTONS
1330: $buttons.=&Apache::lonhtmlcommon::spelllink('xmledit','filecont');
1331: $buttons.=&Apache::lonhtmlcommon::htmlareaselectactive('filecont');
1332: my $editfooter=(<<ENDFOOTER);
1333: $initialize
1334: <hr />
1335: <a name="editsection" />
1336: <form method="post" name="xmledit">
1337: $xml_help
1338: <input type="hidden" name="editmode" value="$lt{'ed'}" />
1339: $buttons<br />
1340: <textarea style="width:100%" cols="80" rows="44" name="filecont" id="filecont">$filecontents</textarea>
1341: <br />$buttons
1342: <br />
1343: </form>
1344: $titledisplay
1345: </body>
1346: ENDFOOTER
1347: # $result=~s/(\<body[^\>]*\>)/$1$editheader/is;
1348: $result=~s/(\<\/body\>)/$editfooter/is;
1349: return $result;
1350: }
1351:
1352: sub get_target {
1353: my $viewgrades=&Apache::lonnet::allowed('vgr',$env{'request.course.id'});
1354: if ( $env{'request.state'} eq 'published') {
1355: if ( defined($env{'form.grade_target'})
1356: && ($viewgrades == 'F' )) {
1357: return ($env{'form.grade_target'});
1358: } elsif (defined($env{'form.grade_target'})) {
1359: if (($env{'form.grade_target'} eq 'web') ||
1360: ($env{'form.grade_target'} eq 'tex') ) {
1361: return $env{'form.grade_target'}
1362: } else {
1363: return 'web';
1364: }
1365: } else {
1366: return 'web';
1367: }
1368: } elsif ($env{'request.state'} eq 'construct') {
1369: if ( defined($env{'form.grade_target'})) {
1370: return ($env{'form.grade_target'});
1371: } else {
1372: return 'web';
1373: }
1374: } else {
1375: return 'web';
1376: }
1377: }
1378:
1379: sub handler {
1380: my $request=shift;
1381:
1382: my $target=&get_target();
1383:
1384: $Apache::lonxml::debug=$env{'user.debug'};
1385:
1386: &Apache::loncommon::content_type($request,'text/html');
1387: &Apache::loncommon::no_cache($request);
1388: if ($env{'request.state'} eq 'published') {
1389: $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
1390: 'lastrevisiondate'));
1391: }
1392: $request->send_http_header;
1393:
1394: return OK if $request->header_only;
1395:
1396:
1397: my $file=&Apache::lonnet::filelocation("",$request->uri);
1398: my $filetype;
1399: if ($file =~ /\.sty$/) {
1400: $filetype='sty';
1401: } else {
1402: $filetype='html';
1403: }
1404: #
1405: # Edit action? Save file.
1406: #
1407: unless ($env{'request.state'} eq 'published') {
1408: if ($env{'form.savethisfile'}) {
1409: if (&storefile($file,$env{'form.filecont'})) {
1410: &Apache::lonxml::info("<font COLOR=\"#0000FF\">".
1411: &mt('Updated').": ".
1412: &Apache::lonlocal::locallocaltime(time).
1413: " </font>");
1414: }
1415: }
1416: }
1417: my %mystyle;
1418: my $result = '';
1419: my $filecontents=&Apache::lonnet::getfile($file);
1420: if ($filecontents eq -1) {
1421: my $start_page=&Apache::loncommon::start_page('File Error');
1422: my $end_page=&Apache::loncommon::end_page('File Error');
1423: my $fnf=&mt('File not found');
1424: $result=(<<ENDNOTFOUND);
1425: $start_page
1426: <b>$fnf: $file</b>
1427: $end_page
1428: ENDNOTFOUND
1429: $filecontents='';
1430: if ($env{'request.state'} ne 'published') {
1431: if ($filetype eq 'sty') {
1432: $filecontents=&createnewsty();
1433: } else {
1434: $filecontents=&createnewhtml();
1435: }
1436: $env{'form.editmode'}='Edit'; #force edit mode
1437: }
1438: } else {
1439: unless ($env{'request.state'} eq 'published') {
1440: if ($filecontents=~/BEGIN LON-CAPA Internal/) {
1441: &Apache::lonxml::error(&mt('This file appears to be a rendering of a LON-CAPA resource. If this is correct, this resource will act very oddly and incorrectly.'));
1442: }
1443: #
1444: # we are in construction space, see if edit mode forced
1445: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1446: ['editmode']);
1447: }
1448: if (!$env{'form.editmode'} || $env{'form.viewmode'}) {
1449: $result = &Apache::lonxml::xmlparse($request,$target,$filecontents,
1450: '',%mystyle);
1451: undef($Apache::lonhomework::parsing_a_task);
1452: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1453: ['rawmode']);
1454: if ($env{'form.rawmode'}) { $result = $filecontents; }
1455: }
1456: }
1457:
1458: #
1459: # Edit action? Insert editing commands
1460: #
1461: unless ($env{'request.state'} eq 'published') {
1462: if ($env{'form.editmode'} && (!($env{'form.viewmode'}))) {
1463: my $displayfile=$request->uri;
1464: $displayfile=~s/^\/[^\/]*//;
1465: my %options = ();
1466: if ($env{'environment.remote'} ne 'off') {
1467: $options{'bgcolor'} = '#FFFFFF';
1468: }
1469: my $start_page = &Apache::loncommon::start_page(undef,undef,
1470: \%options);
1471: $result=$start_page.
1472: &Apache::lonxml::message_location().'<h3>'.
1473: $displayfile.
1474: '</h3>'.&Apache::loncommon::end_page();
1475: $result=&inserteditinfo($result,$filecontents,$filetype);
1476: }
1477: }
1478: if ($filetype eq 'html') { &writeallows($request->uri); }
1479:
1480:
1481: &Apache::lonxml::add_messages(\$result);
1482: $request->print($result);
1483:
1484: return OK;
1485: }
1486:
1487: sub display_title {
1488: my $result;
1489: if ($env{'request.state'} eq 'construct') {
1490: my $title=&Apache::lonnet::gettitle();
1491: if (!defined($title) || $title eq '') {
1492: $title = $env{'request.filename'};
1493: $title = substr($title, rindex($title, '/') + 1);
1494: }
1495: $result = "<script type='text/javascript'>top.document.title = '$title - LON-CAPA Construction Space';</script>";
1496: }
1497: return $result;
1498: }
1499:
1500: sub debug {
1501: if ($Apache::lonxml::debug eq "1") {
1502: $|=1;
1503: my $request=$Apache::lonxml::request;
1504: if (!$request) {
1505: eval { $request=Apache->request; };
1506: }
1507: if (!$request) {
1508: eval { $request=Apache2::RequestUtil->request; };
1509: }
1510: $request->print('<font size="-2"><pre>DEBUG:'.&HTML::Entities::encode($_[0],'<>&"')."</pre></font>\n");
1511: #&Apache::lonnet::logthis($_[0]);
1512: }
1513: }
1514:
1515: sub show_error_warn_msg {
1516: if ($env{'request.filename'} eq '/home/httpd/html/res/lib/templates/simpleproblem.problem' &&
1517: &Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
1518: return 1;
1519: }
1520: return (($Apache::lonxml::debug eq 1) ||
1521: ($env{'request.state'} eq 'construct') ||
1522: ($Apache::lonhomework::browse eq 'F'
1523: &&
1524: $env{'form.show_errors'} eq 'on'));
1525: }
1526:
1527: sub error {
1528: $errorcount++;
1529: if ( &show_error_warn_msg() ) {
1530: # If printing in construction space, put the error inside <pre></pre>
1531: push(@Apache::lonxml::error_messages,
1532: $Apache::lonxml::warnings_error_header.
1533: "<b>ERROR:</b>".join("<br />\n",@_)."<br />\n");
1534: $Apache::lonxml::warnings_error_header='';
1535: } else {
1536: my $errormsg;
1537: my ($symb)=&Apache::lonnet::symbread();
1538: if ( !$symb ) {
1539: #public or browsers
1540: $errormsg=&mt("An error occured while processing this resource. The author has been notified.");
1541: }
1542: my $msg = join('<br />',@_);
1543: #notify author
1544: &Apache::lonmsg::author_res_msg($env{'request.filename'},$msg);
1545: #notify course
1546: if ( $symb && $env{'request.course.id'} ) {
1547: my $cnum=$env{'course.'.$env{'request.course.id'}.'.num'};
1548: my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
1549: my (undef,%users)=&Apache::lonfeedback::decide_receiver(undef,0,1,1,1);
1550: my $declutter=&Apache::lonnet::declutter($env{'request.filename'});
1551: my @userlist;
1552: foreach (keys %users) {
1553: my ($user,$domain) = split(/:/, $_);
1554: push(@userlist,"$user\@$domain");
1555: my $key=$declutter.'_'.$user.'_'.$domain;
1556: my %lastnotified=&Apache::lonnet::get('nohist_xmlerrornotifications',
1557: [$key],
1558: $cdom,$cnum);
1559: my $now=time;
1560: if ($now-$lastnotified{$key}>86400) {
1561: &Apache::lonmsg::user_normal_msg($user,$domain,
1562: "Error [$declutter]",$msg);
1563: &Apache::lonnet::put('nohist_xmlerrornotifications',
1564: {$key => $now},
1565: $cdom,$cnum);
1566: }
1567: }
1568: if ($env{'request.role.adv'}) {
1569: $errormsg=&mt("An error occured while processing this resource. The course personnel ([_1]) and the author have been notified.",join(', ',@userlist));
1570: } else {
1571: $errormsg=&mt("An error occured while processing this resource. The instructor has been notified.");
1572: }
1573: }
1574: push(@Apache::lonxml::error_messages,"<b>$errormsg</b> <br />");
1575: }
1576: }
1577:
1578: sub warning {
1579: $warningcount++;
1580:
1581: if ($env{'form.grade_target'} ne 'tex') {
1582: if ( &show_error_warn_msg() ) {
1583: push(@Apache::lonxml::warning_messages,
1584: $Apache::lonxml::warnings_error_header.
1585: "<b>W</b>ARNING<b>:</b>".join('<br />',@_)."<br />\n");
1586: $Apache::lonxml::warnings_error_header='';
1587: }
1588: }
1589: }
1590:
1591: sub info {
1592: if ($env{'form.grade_target'} ne 'tex'
1593: && $env{'request.state'} eq 'construct') {
1594: push(@Apache::lonxml::info_messages,join('<br />',@_)."<br />\n");
1595: }
1596: }
1597:
1598: sub message_location {
1599: return '__LONCAPA_INTERNAL_MESSAGE_LOCATION__';
1600: }
1601:
1602: sub add_messages {
1603: my ($msg)=@_;
1604: my $result=join(' ',
1605: @Apache::lonxml::info_messages,
1606: @Apache::lonxml::error_messages,
1607: @Apache::lonxml::warning_messages);
1608: undef(@Apache::lonxml::info_messages);
1609: undef(@Apache::lonxml::error_messages);
1610: undef(@Apache::lonxml::warning_messages);
1611: $$msg=~s/__LONCAPA_INTERNAL_MESSAGE_LOCATION__/$result/;
1612: $$msg=~s/__LONCAPA_INTERNAL_MESSAGE_LOCATION__//g;
1613: }
1614:
1615: sub get_param {
1616: my ($param,$parstack,$safeeval,$context,$case_insensitive) = @_;
1617: if ( ! $context ) { $context = -1; }
1618: my $args ='';
1619: if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
1620: if ( ! $Apache::lonxml::usestyle ) {
1621: $args=$Apache::lonxml::style_values.$args;
1622: }
1623: if ( ! $args ) { return undef; }
1624: if ( $case_insensitive ) {
1625: if ($args =~ s/(my \$)(\Q$param\E)(=\")/$1.lc($2).$3/ei) {
1626: return &Apache::run::run("{$args;".'return $'.$param.'}',
1627: $safeeval); #'
1628: } else {
1629: return undef;
1630: }
1631: } else {
1632: if ( $args =~ /my \$\Q$param\E=\"/ ) {
1633: return &Apache::run::run("{$args;".'return $'.$param.'}',
1634: $safeeval); #'
1635: } else {
1636: return undef;
1637: }
1638: }
1639: }
1640:
1641: sub get_param_var {
1642: my ($param,$parstack,$safeeval,$context,$case_insensitive) = @_;
1643: if ( ! $context ) { $context = -1; }
1644: my $args ='';
1645: if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
1646: if ( ! $Apache::lonxml::usestyle ) {
1647: $args=$Apache::lonxml::style_values.$args;
1648: }
1649: &Apache::lonxml::debug("Args are $args param is $param");
1650: if ($case_insensitive) {
1651: if (! ($args=~s/(my \$)(\Q$param\E)(=\")/$1.lc($2).$3/ei)) {
1652: return undef;
1653: }
1654: } elsif ( $args !~ /my \$\Q$param\E=\"/ ) { return undef; }
1655: my $value=&Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
1656: &Apache::lonxml::debug("first run is $value");
1657: if ($value =~ /^[\$\@\%][a-zA-Z_]\w*$/) {
1658: &Apache::lonxml::debug("doing second");
1659: my @result=&Apache::run::run("return $value",$safeeval,1);
1660: if (!defined($result[0])) {
1661: return $value
1662: } else {
1663: if (wantarray) { return @result; } else { return $result[0]; }
1664: }
1665: } else {
1666: return $value;
1667: }
1668: }
1669:
1670: sub register_insert {
1671: my @data = split /\n/, &Apache::lonnet::getfile('/home/httpd/lonTabs/insertlist.tab');
1672: my $i;
1673: my $tagnum=0;
1674: my @order;
1675: for ($i=0;$i < $#data; $i++) {
1676: my $line = $data[$i];
1677: if ( $line =~ /^\#/ || $line =~ /^\s*\n/) { next; }
1678: if ( $line =~ /TABLE/ ) { last; }
1679: my ($tag,$descrip,$color,$function,$show,$helpfile,$helpdesc) = split(/,/, $line);
1680: if ($tag) {
1681: $insertlist{"$tagnum.tag"} = $tag;
1682: $insertlist{"$tagnum.description"} = $descrip;
1683: $insertlist{"$tagnum.color"} = $color;
1684: $insertlist{"$tagnum.function"} = $function;
1685: if (!defined($show)) { $show='yes'; }
1686: $insertlist{"$tagnum.show"}= $show;
1687: $insertlist{"$tagnum.helpfile"} = $helpfile;
1688: $insertlist{"$tagnum.helpdesc"} = $helpdesc;
1689: $insertlist{"$tag.num"}=$tagnum;
1690: $tagnum++;
1691: }
1692: }
1693: $i++; #skipping TABLE line
1694: $tagnum = 0;
1695: for (;$i < $#data;$i++) {
1696: my $line = $data[$i];
1697: my ($mnemonic,@which) = split(/ +/,$line);
1698: my $tag = $insertlist{"$tagnum.tag"};
1699: for (my $j=0;$j <=$#which;$j++) {
1700: if ( $which[$j] eq 'Y' ) {
1701: if ($insertlist{"$j.show"} ne 'no') {
1702: push(@{ $insertlist{"$tag.which"} },$j);
1703: }
1704: }
1705: }
1706: $tagnum++;
1707: }
1708: }
1709:
1710: sub description {
1711: my ($token)=@_;
1712: my $tagnum;
1713: my $tag=$token->[1];
1714: foreach my $namespace (reverse @Apache::lonxml::namespace) {
1715: my $testtag=$namespace.'::'.$tag;
1716: $tagnum=$insertlist{"$testtag.num"};
1717: if (defined($tagnum)) { last; }
1718: }
1719: if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
1720: return $insertlist{$tagnum.'.description'};
1721: }
1722:
1723: # Returns a list containing the help file, and the description
1724: sub helpinfo {
1725: my ($token)=@_;
1726: my $tagnum;
1727: my $tag=$token->[1];
1728: foreach my $namespace (reverse @Apache::lonxml::namespace) {
1729: my $testtag=$namespace.'::'.$tag;
1730: $tagnum=$insertlist{"$testtag.num"};
1731: if (defined($tagnum)) { last; }
1732: }
1733: if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
1734: return ($insertlist{$tagnum.'.helpfile'}, $insertlist{$tagnum.'.helpdesc'});
1735: }
1736:
1737: # ----------------------------------------------------------------- whichuser
1738: # returns a list of $symb, $courseid, $domain, $name that is correct for
1739: # calls to lonnet functions for this setup.
1740: # - looks for form.grade_ parameters
1741: sub whichuser {
1742: my ($passedsymb)=@_;
1743: my ($symb,$courseid,$domain,$name,$publicuser);
1744: if (defined($env{'form.grade_symb'})) {
1745: my ($tmp_courseid)=
1746: &Apache::loncommon::get_env_multiple('form.grade_courseid');
1747: my $allowed=&Apache::lonnet::allowed('vgr',$tmp_courseid);
1748: if (!$allowed &&
1749: exists($env{'request.course.sec'}) &&
1750: $env{'request.course.sec'} !~ /^\s*$/) {
1751: $allowed=&Apache::lonnet::allowed('vgr',$tmp_courseid.
1752: '/'.$env{'request.course.sec'});
1753: }
1754: if ($allowed) {
1755: ($symb)=&Apache::loncommon::get_env_multiple('form.grade_symb');
1756: $courseid=$tmp_courseid;
1757: ($domain)=&Apache::loncommon::get_env_multiple('form.grade_domain');
1758: ($name)=&Apache::loncommon::get_env_multiple('form.grade_username');
1759: return ($symb,$courseid,$domain,$name,$publicuser);
1760: }
1761: }
1762: if (!$passedsymb) {
1763: $symb=&Apache::lonnet::symbread();
1764: } else {
1765: $symb=$passedsymb;
1766: }
1767: $courseid=$env{'request.course.id'};
1768: $domain=$env{'user.domain'};
1769: $name=$env{'user.name'};
1770: if ($name eq 'public' && $domain eq 'public') {
1771: if (!defined($env{'form.username'})) {
1772: $env{'form.username'}.=time.rand(10000000);
1773: }
1774: $name.=$env{'form.username'};
1775: }
1776: return ($symb,$courseid,$domain,$name,$publicuser);
1777: }
1778:
1779: 1;
1780: __END__
1781:
1782:
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