1: # The LearningOnline Network with CAPA
2: # XML Parser Module
3: #
4: # last modified 06/26/00 by Alexander Sakharuk
5: # 11/6 Gerd Kortemeyer
6: # 6/1/1 Gerd Kortemeyer
7: # 2/21,3/13 Guy
8: # 3/29,5/4 Gerd Kortemeyer
9: # 5/10 Scott Harrison
10: # 5/26 Gerd Kortemeyer
11: # 5/27 H. K. Ng
12: # 6/2,6/3,6/8,6/9 Gerd Kortemeyer
13: # 6/12,6/13 H. K. Ng
14: # 6/16 Gerd Kortemeyer
15: # 7/27 H. K. Ng
16: # 8/7 Gerd Kortemeyer
17:
18: package Apache::lonxml;
19: use vars
20: qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace);
21: use strict;
22: use HTML::TokeParser;
23: use HTML::TreeBuilder;
24: use Safe;
25: use Safe::Hole;
26: use Math::Cephes qw(:trigs :hypers :bessels erf erfc);
27: use Math::Random qw(:all);
28: use Opcode;
29:
30: sub register {
31: my $space;
32: my @taglist;
33: my $temptag;
34: ($space,@taglist) = @_;
35: foreach $temptag (@taglist) {
36: $Apache::lonxml::alltags{$temptag}=$space;
37: }
38: }
39:
40: use Apache::Constants qw(:common);
41: use Apache::lontexconvert;
42: use Apache::style;
43: use Apache::run;
44: use Apache::londefdef;
45: use Apache::scripttag;
46: use Apache::edit;
47: use Apache::lonnet;
48: use Apache::File;
49:
50: #================================================== Main subroutine: xmlparse
51: #debugging control, to turn on debugging modify the correct handler
52: $Apache::lonxml::debug=0;
53:
54: #path to the directory containing the file currently being processed
55: @pwd=();
56:
57: #these two are used for capturing a subset of the output for later processing,
58: #don't touch them directly use &startredirection and &endredirection
59: @outputstack = ();
60: $redirection = 0;
61:
62: #controls wheter the <import> tag actually does
63: $import = 1;
64: @extlinks=();
65:
66: # meta mode is a bit weird only some output is to be turned off
67: #<output> tag turns metamode off (defined in londefdef.pm)
68: $metamode = 0;
69:
70: # turns on and of run::evaluate actually derefencing var refs
71: $evaluate = 1;
72:
73: # data structure for eidt mode, determines what tags can go into what other tags
74: %insertlist=();
75:
76: # stores the list of active tag namespaces
77: @namespace=();
78:
79: # has the dynamic menu been updated to know about this resource
80: $Apache::lonxml::registered=0;
81:
82: sub xmlbegin {
83: my $output='';
84: if ($ENV{'browser.mathml'}) {
85: $output='<?xml version="1.0"?>'
86: .'<?xml-stylesheet type="text/css" href="/adm/MathML/mathml.css"?>'
87: .'<!DOCTYPE html SYSTEM "/adm/MathML/mathml.dtd" '
88: .'[<!ENTITY mathns "http://www.w3.org/1998/Math/MathML">]>'
89: .'<html xmlns:math="http://www.w3.org/1998/Math/MathML" '
90: .'xmlns="http://www.w3.org/TR/REC-html40">';
91: } else {
92: $output='<html>';
93: }
94: return $output;
95: }
96:
97: sub xmlend {
98: my $discussion='';
99: if ($ENV{'request.course.id'}) {
100: my $symb=&Apache::lonnet::symbread();
101: if ($symb) {
102: my %contrib=&Apache::lonnet::restore($symb,$ENV{'request.course.id'},
103: $ENV{'course.'.$ENV{'request.course.id'}.'.domain'},
104: $ENV{'course.'.$ENV{'request.course.id'}.'.num'});
105: if ($contrib{'version'}) {
106: $discussion.=
107: '<address><hr /><h2>Course Discussion of Resource</h2>';
108: my $idx;
109: for ($idx=1;$idx<=$contrib{'version'};$idx++) {
110: my $message=$contrib{$idx.':message'};
111: $message=~s/\n/\<br \/\>/g;
112: $discussion.='<p><b>'.$contrib{$idx.':sendername'}.' at '.
113: $contrib{$idx.':senderdomain'}.'</b> ('.
114: localtime($contrib{$idx.':timestamp'}).
115: '):<blockquote>'.$message.
116: '</blockquote></p>';
117: }
118: $discussion.='</address>';
119: }
120: }
121: }
122: return $discussion.'</html>';
123: }
124:
125: sub fontsettings() {
126: my $headerstring='';
127: if (($ENV{'browser.os'} eq 'mac') && (!$ENV{'browser.mathml'})) {
128: $headerstring.=
129: '<meta Content-Type="text/html; charset=x-mac-roman">';
130: }
131: return $headerstring;
132: }
133:
134: sub registerurl {
135: my $forcereg=shift;
136: if ($Apache::lonxml::registered) { return ''; }
137: $Apache::lonxml::registered=1;
138: if (($ENV{'REQUEST_URI'}!~/^\/(res\/)*adm\//) || ($forcereg)) {
139: my $hwkadd='';
140: if ($ENV{'REQUEST_URI'}=~/\.(problem|exam|quiz|assess|survey|form)$/) {
141: if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
142: $hwkadd.=(<<ENDSUBM);
143: menu.switchbutton
144: (7,1,'subm.gif','view sub','missions',
145: 'gocmd("/adm/grades","submission")');
146: ENDSUBM
147: }
148: if (&Apache::lonnet::allowed('mgr',$ENV{'request.course.id'})) {
149: $hwkadd.=(<<ENDGRDS);
150: menu.switchbutton
151: (7,2,'pgrd.gif','problem','grades',
152: 'gocmd("/adm/grades","viewgrades")');
153: ENDGRDS
154: }
155: if (&Apache::lonnet::allowed('opa',$ENV{'request.course.id'})) {
156: $hwkadd.=(<<ENDPARM);
157: menu.switchbutton
158: (7,3,'pparm.gif','problem','parms',
159: 'gocmd("/adm/parmset","set")');
160: ENDPARM
161: }
162: }
163: return (<<ENDREGTHIS);
164:
165: <script language="JavaScript">
166: // BEGIN LON-CAPA Internal
167:
168: function LONCAPAreg() {
169: menu=window.open("","LONCAPAmenu");
170: menu.clearTimeout(menu.menucltim);
171: menu.currentURL=window.location.pathname;
172: menu.currentStale=0;
173: menu.clearbut(3,1);
174: menu.switchbutton
175: (8,1,'eval.gif','evaluate','this','gopost("/adm/evaluate",currentURL)');
176: menu.switchbutton
177: (8,2,'fdbk.gif','feedback','on this','gopost("/adm/feedback",currentURL)');
178: menu.switchbutton
179: (8,3,'prt.gif','prepare','printout','gopost("/adm/printout",currentURL)');
180: menu.switchbutton
181: (2,1,'back.gif','backward','','gopost("/adm/flip","back:"+currentURL)');
182: menu.switchbutton
183: (2,3,'forw.gif','forward','','gopost("/adm/flip","forward:"+currentURL)');
184: menu.switchbutton
185: (9,1,'sbkm.gif','set','bookmark','set_bookmark()');
186: menu.switchbutton
187: (9,2,'vbkm.gif','view','bookmark','edit_bookmarks()');
188: menu.switchbutton
189: (9,3,'anot.gif','anno-','tations','annotate()');
190: $hwkadd
191: }
192:
193: function LONCAPAstale() {
194: menu=window.open("","LONCAPAmenu");
195: menu.currentStale=1;
196: menu.switchbutton
197: (3,1,'reload.gif','return','location','go(currentURL)');
198: menu.clearbut(7,1);
199: menu.clearbut(7,2);
200: menu.clearbut(7,3);
201: menu.menucltim=menu.setTimeout(
202: 'clearbut(2,1);clearbut(2,3);clearbut(8,1);clearbut(8,2);clearbut(8,3);'+
203: 'clearbut(9,1);clearbut(9,2);clearbut(9,3);',
204: 2000);
205:
206: }
207:
208: // END LON-CAPA Internal
209: </script>
210: ENDREGTHIS
211:
212: } else {
213: return (<<ENDDONOTREGTHIS);
214:
215: <script language="JavaScript">
216: // BEGIN LON-CAPA Internal
217:
218: function LONCAPAreg() {
219: menu=window.open("","LONCAPAmenu");
220: menu.currentStale=1;
221: menu.clearbut(2,1);
222: menu.clearbut(2,3);
223: menu.clearbut(8,1);
224: menu.clearbut(8,2);
225: menu.clearbut(8,3);
226: if (menu.currentURL) {
227: menu.switchbutton
228: (3,1,'reload.gif','return','location','go(currentURL)');
229: } else {
230: menu.clearbut(3,1);
231: }
232: }
233:
234: function LONCAPAstale() {
235: }
236:
237: // END LON-CAPA Internal
238: </script>
239: ENDDONOTREGTHIS
240:
241: }
242: }
243:
244: sub loadevents() {
245: return 'LONCAPAreg();';
246: }
247:
248: sub unloadevents() {
249: return 'LONCAPAstale();';
250: }
251:
252: sub printalltags {
253: my $temp;
254: foreach $temp (sort keys %Apache::lonxml::alltags) {
255: &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
256: }
257: }
258:
259: sub xmlparse {
260: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
261:
262: &setup_globals($target);
263: #&printalltags();
264: my @pars = ();
265: my $pwd=$ENV{'request.filename'};
266: $pwd =~ s:/[^/]*$::;
267: &newparser(\@pars,\$content_file_string,$pwd);
268:
269: my $safeeval = new Safe;
270: my $safehole = new Safe::Hole;
271: &init_safespace($target,$safeeval,$safehole,$safeinit);
272: #-------------------- Redefinition of the target in the case of compound target
273:
274: ($target, my @tenta) = split('&&',$target);
275:
276: my @stack = ();
277: my @parstack = ();
278: &initdepth;
279:
280: my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars,
281: $safeeval,\%style_for_target);
282:
283: return $finaloutput;
284: }
285:
286: sub htmlclean {
287: my ($raw,$full)=@_;
288:
289: my $tree = HTML::TreeBuilder->new;
290: $tree->ignore_unknown(0);
291:
292: $tree->parse($raw);
293:
294: my $output= $tree->as_HTML(undef,' ');
295:
296: $output=~s/\<(br|hr|img)([^\>\/]*)\>/\<$1$2 \/\>/gis;
297: $output=~s/\<\/(br|hr|img)\>//gis;
298: unless ($full) {
299: $output=~s/\<[\/]*(body|head|html)\>//gis;
300: }
301:
302: $tree = $tree->delete;
303:
304: return $output;
305: }
306:
307: sub inner_xmlparse {
308: my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target)=@_;
309: &Apache::lonxml::debug('Reentrant parser starting, again?');
310: my $finaloutput = '';
311: my $result;
312: my $token;
313: while ( $#$pars > -1 ) {
314: while ($token = $$pars['-1']->get_token) {
315: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
316: if ($metamode<1) {
317: $result=$token->[1];
318: }
319: } elsif ($token->[0] eq 'PI') {
320: if ($metamode<1) {
321: $result=$token->[2];
322: }
323: } elsif ($token->[0] eq 'S') {
324: # add tag to stack
325: push (@$stack,$token->[1]);
326: # add parameters list to another stack
327: push (@$parstack,&parstring($token));
328: &increasedepth($token);
329: if (exists $$style_for_target{$token->[1]}) {
330: if ($Apache::lonxml::redirection) {
331: $Apache::lonxml::outputstack['-1'] .=
332: &recurse($$style_for_target{$token->[1]},$target,$safeeval,
333: $style_for_target,@$parstack);
334: } else {
335: $finaloutput .= &recurse($$style_for_target{$token->[1]},$target,
336: $safeeval,$style_for_target,@$parstack);
337: }
338: } else {
339: $result = &callsub("start_$token->[1]", $target, $token, $stack,
340: $parstack, $pars, $safeeval, $style_for_target);
341: }
342: } elsif ($token->[0] eq 'E') {
343: #clear out any tags that didn't end
344: while ($token->[1] ne $$stack['-1'] && ($#$stack > -1)) {
345: &Apache::lonxml::warning("Unbalanced tags in resource $$stack['-1']");
346: &end_tag($stack,$parstack,$token);
347: }
348:
349: if (exists $$style_for_target{'/'."$token->[1]"}) {
350: if ($Apache::lonxml::redirection) {
351: $Apache::lonxml::outputstack['-1'] .=
352: &recurse($$style_for_target{'/'."$token->[1]"},
353: $target,$safeeval,$style_for_target,@$parstack);
354: } else {
355: $finaloutput .= &recurse($$style_for_target{'/'."$token->[1]"},
356: $target,$safeeval,$style_for_target,
357: @$parstack);
358: }
359:
360: } else {
361: $result = &callsub("end_$token->[1]", $target, $token, $stack,
362: $parstack, $pars,$safeeval, $style_for_target);
363: }
364: } else {
365: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
366: }
367: #evaluate variable refs in result
368: if ($result ne "") {
369: if ( $#$parstack > -1 ) {
370: if ($Apache::lonxml::redirection) {
371: $Apache::lonxml::outputstack['-1'] .=
372: &Apache::run::evaluate($result,$safeeval,$$parstack['-1']);
373: } else {
374: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
375: $$parstack['-1']);
376: }
377: } else {
378: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
379: }
380: $result = '';
381: }
382: if ($token->[0] eq 'E') {
383: &end_tag($stack,$parstack,$token);
384: }
385: }
386: pop @$pars;
387: pop @Apache::lonxml::pwd;
388: }
389:
390: # if ($target eq 'meta') {
391: # $finaloutput.=&endredirection;
392: # }
393:
394: if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) {
395: $finaloutput=&afterburn($finaloutput);
396: }
397: return $finaloutput;
398: }
399:
400: sub recurse {
401: my @innerstack = ();
402: my @innerparstack = ();
403: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
404: my @pat = ();
405: &newparser(\@pat,\$newarg);
406: my $tokenpat;
407: my $partstring = '';
408: my $output='';
409: my $decls='';
410: while ( $#pat > -1 ) {
411: while ($tokenpat = $pat[$#pat]->get_token) {
412: if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) {
413: if ($metamode<1) { $partstring=$tokenpat->[1]; }
414: } elsif ($tokenpat->[0] eq 'PI') {
415: if ($metamode<1) { $partstring=$tokenpat->[2]; }
416: } elsif ($tokenpat->[0] eq 'S') {
417: push (@innerstack,$tokenpat->[1]);
418: push (@innerparstack,&parstring($tokenpat));
419: &increasedepth($tokenpat);
420: $partstring = &callsub("start_$tokenpat->[1]", $target, $tokenpat,
421: \@innerstack, \@innerparstack, \@pat,
422: $safeeval, $style_for_target);
423: } elsif ($tokenpat->[0] eq 'E') {
424: #clear out any tags that didn't end
425: while ($tokenpat->[1] ne $innerstack[$#innerstack]
426: && ($#innerstack > -1)) {
427: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']");
428: &end_tag(\@innerstack,\@innerparstack,$tokenpat);
429: }
430: $partstring = &callsub("end_$tokenpat->[1]", $target, $tokenpat,
431: \@innerstack, \@innerparstack, \@pat,
432: $safeeval, $style_for_target);
433: } else {
434: &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:");
435: }
436: #pass both the variable to the style tag, and the tag we
437: #are processing inside the <definedtag>
438: if ( $partstring ne "" ) {
439: if ( $#parstack > -1 ) {
440: if ( $#innerparstack > -1 ) {
441: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
442: } else {
443: $decls= $parstack[$#parstack];
444: }
445: } else {
446: if ( $#innerparstack > -1 ) {
447: $decls=$innerparstack[$#innerparstack];
448: } else {
449: $decls='';
450: }
451: }
452: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
453: $partstring = '';
454: }
455: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
456: &decreasedepth($tokenpat);}
457: }
458: pop @pat;
459: pop @Apache::lonxml::pwd;
460: }
461: return $output;
462: }
463:
464: sub callsub {
465: my ($sub,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
466: my $currentstring='';
467: my $nodefault;
468: {
469: my $sub1;
470: no strict 'refs';
471: my $tag=$token->[1];
472: my $space=$Apache::lonxml::alltags{$tag};
473: if (!$space) {
474: $tag=~tr/A-Z/a-z/;
475: $sub=~tr/A-Z/a-z/;
476: $space=$Apache::lonxml::alltags{$tag}
477: }
478:
479: my $deleted=0;
480: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
481: if (($token->[0] eq 'S') && ($target eq 'modified')) {
482: $deleted=&Apache::edit::handle_delete($space,$target,$token,$tagstack,
483: $parstack,$parser,$safeeval,
484: $style);
485: }
486: if (!$deleted) {
487: if ($space) {
488: #&Apache::lonxml::debug("Calling sub $sub in $space $metamode<br />\n");
489: $sub1="$space\:\:$sub";
490: ($currentstring,$nodefault) = &$sub1($target,$token,$tagstack,
491: $parstack,$parser,$safeeval,
492: $style);
493: } else {
494: #&Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode<br />\n");
495: if ($metamode <1) {
496: if (defined($token->[4]) && ($metamode < 1)) {
497: $currentstring = $token->[4];
498: } else {
499: $currentstring = $token->[2];
500: }
501: }
502: }
503: # &Apache::lonxml::debug("nodefalt:$nodefault:");
504: if ($currentstring eq '' && $nodefault eq '') {
505: if ($target eq 'edit') {
506: &Apache::lonxml::debug("doing default edit for $token->[1]");
507: if ($token->[0] eq 'S') {
508: $currentstring = &Apache::edit::tag_start($target,$token);
509: } elsif ($token->[0] eq 'E') {
510: $currentstring = &Apache::edit::tag_end($target,$token);
511: }
512: } elsif ($target eq 'modified') {
513: if ($token->[0] eq 'S') {
514: $currentstring = $token->[4];
515: $currentstring.=&Apache::edit::handle_insert();
516: } else {
517: $currentstring = $token->[2];
518: }
519: }
520: }
521: }
522: use strict 'refs';
523: }
524: return $currentstring;
525: }
526:
527: sub setup_globals {
528: my ($target)=@_;
529: $Apache::lonxml::registered = 0;
530: @Apache::lonxml::pwd=();
531: if ($target eq 'meta') {
532: $Apache::lonxml::redirection = 0;
533: $Apache::lonxml::metamode = 1;
534: $Apache::lonxml::evaluate = 1;
535: $Apache::lonxml::import = 0;
536: } elsif ($target eq 'grade') {
537: &startredirection;
538: $Apache::lonxml::metamode = 0;
539: $Apache::lonxml::evaluate = 1;
540: $Apache::lonxml::import = 1;
541: } elsif ($target eq 'modified') {
542: $Apache::lonxml::redirection = 0;
543: $Apache::lonxml::metamode = 0;
544: $Apache::lonxml::evaluate = 0;
545: $Apache::lonxml::import = 0;
546: } elsif ($target eq 'edit') {
547: $Apache::lonxml::redirection = 0;
548: $Apache::lonxml::metamode = 0;
549: $Apache::lonxml::evaluate = 0;
550: $Apache::lonxml::import = 0;
551: } else {
552: $Apache::lonxml::redirection = 0;
553: $Apache::lonxml::metamode = 0;
554: $Apache::lonxml::evaluate = 1;
555: $Apache::lonxml::import = 1;
556: }
557: }
558:
559: sub init_safespace {
560: my ($target,$safeeval,$safehole,$safeinit) = @_;
561: $safeeval->permit("entereval");
562: $safeeval->permit(":base_math");
563: $safeeval->permit("sort");
564: $safeeval->deny(":base_io");
565: $safehole->wrap(\&Apache::scripttag::xmlparse,$safeeval,'&xmlparse');
566: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
567:
568: $safehole->wrap(\&Math::Cephes::asin,$safeeval,'&asin');
569: $safehole->wrap(\&Math::Cephes::acos,$safeeval,'&acos');
570: $safehole->wrap(\&Math::Cephes::atan,$safeeval,'&atan');
571: $safehole->wrap(\&Math::Cephes::sinh,$safeeval,'&sinh');
572: $safehole->wrap(\&Math::Cephes::cosh,$safeeval,'&cosh');
573: $safehole->wrap(\&Math::Cephes::tanh,$safeeval,'&tanh');
574: $safehole->wrap(\&Math::Cephes::asinh,$safeeval,'&asinh');
575: $safehole->wrap(\&Math::Cephes::acosh,$safeeval,'&acosh');
576: $safehole->wrap(\&Math::Cephes::atanh,$safeeval,'&atanh');
577: $safehole->wrap(\&Math::Cephes::erf,$safeeval,'&erf');
578: $safehole->wrap(\&Math::Cephes::erfc,$safeeval,'&erfc');
579: $safehole->wrap(\&Math::Cephes::j0,$safeeval,'&j0');
580: $safehole->wrap(\&Math::Cephes::j1,$safeeval,'&j1');
581: $safehole->wrap(\&Math::Cephes::jn,$safeeval,'&jn');
582: $safehole->wrap(\&Math::Cephes::jv,$safeeval,'&jv');
583: $safehole->wrap(\&Math::Cephes::y0,$safeeval,'&y0');
584: $safehole->wrap(\&Math::Cephes::y1,$safeeval,'&y1');
585: $safehole->wrap(\&Math::Cephes::yn,$safeeval,'&yn');
586: $safehole->wrap(\&Math::Cephes::yv,$safeeval,'&yv');
587: $safehole->wrap(\&Math::Random::random_beta,$safeeval,'&math_random_beta');
588: $safehole->wrap(\&Math::Random::random_chi_square,$safeeval,'&math_random_chi_square');
589: $safehole->wrap(\&Math::Random::random_exponential,$safeeval,'&math_random_exponential');
590: $safehole->wrap(\&Math::Random::random_f,$safeeval,'&math_random_f');
591: $safehole->wrap(\&Math::Random::random_gamma,$safeeval,'&math_random_gamma');
592: $safehole->wrap(\&Math::Random::random_multivariate_normal,$safeeval,'&math_random_multivariate_normal');
593: $safehole->wrap(\&Math::Random::random_multinomial,$safeeval,'&math_random_multinomial');
594: $safehole->wrap(\&Math::Random::random_noncentral_chi_square,$safeeval,'&math_random_noncentral_chi_square');
595: $safehole->wrap(\&Math::Random::random_noncentral_f,$safeeval,'&math_random_noncentral_f');
596: $safehole->wrap(\&Math::Random::random_normal,$safeeval,'&math_random_normal');
597: $safehole->wrap(\&Math::Random::random_permutation,$safeeval,'&math_random_permutation');
598: $safehole->wrap(\&Math::Random::random_permuted_index,$safeeval,'&math_random_permuted_index');
599: $safehole->wrap(\&Math::Random::random_uniform,$safeeval,'&math_random_uniform');
600: $safehole->wrap(\&Math::Random::random_poisson,$safeeval,'&math_random_poisson');
601: $safehole->wrap(\&Math::Random::random_uniform_integer,$safeeval,'&math_random_uniform_integer');
602: $safehole->wrap(\&Math::Random::random_negative_binomial,$safeeval,'&math_random_negative_binomial');
603: $safehole->wrap(\&Math::Random::random_binomial,$safeeval,'&math_random_binomial');
604: $safehole->wrap(\&Math::Random::random_seed_from_phrase,$safeeval,'&random_seed_from_phrase');
605: $safehole->wrap(\&Math::Random::random_set_seed_from_phrase,$safeeval,'&random_set_seed_from_phrase');
606: $safehole->wrap(\&Math::Random::random_get_seed,$safeeval,'&random_get_seed');
607: $safehole->wrap(\&Math::Random::random_set_seed,$safeeval,'&random_set_seed');
608:
609: #need to inspect this class of ops
610: # $safeeval->deny(":base_orig");
611: $safeinit .= ';$external::target="'.$target.'";';
612: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
613: &Apache::run::run($safeinit,$safeeval);
614: }
615:
616: sub startredirection {
617: $Apache::lonxml::redirection++;
618: push (@Apache::lonxml::outputstack, '');
619: }
620:
621: sub endredirection {
622: if (!$Apache::lonxml::redirection) {
623: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuging information:".join ":",caller);
624: return '';
625: }
626: $Apache::lonxml::redirection--;
627: pop @Apache::lonxml::outputstack;
628: }
629:
630: sub end_tag {
631: my ($tagstack,$parstack,$token)=@_;
632: pop(@$tagstack);
633: pop(@$parstack);
634: &decreasedepth($token);
635: }
636:
637: sub initdepth {
638: @Apache::lonxml::depthcounter=();
639: $Apache::lonxml::depth=-1;
640: $Apache::lonxml::olddepth=-1;
641: }
642:
643: sub increasedepth {
644: my ($token) = @_;
645: $Apache::lonxml::depth++;
646: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
647: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
648: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
649: }
650: my $curdepth=join('_',@Apache::lonxml::depthcounter);
651: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
652: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
653: }
654:
655: sub decreasedepth {
656: my ($token) = @_;
657: $Apache::lonxml::depth--;
658: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
659: $#Apache::lonxml::depthcounter--;
660: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
661: }
662: if ( $Apache::lonxml::depth < -1) {
663: &Apache::lonxml::warning("Unbalanced tags in resource");
664: $Apache::lonxml::depth='-1';
665: }
666: my $curdepth=join('_',@Apache::lonxml::depthcounter);
667: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
668: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
669: }
670:
671: sub get_all_text {
672:
673: my($tag,$pars)= @_;
674: my $depth=0;
675: my $token;
676: my $result='';
677: if ( $tag =~ m:^/: ) {
678: my $tag=substr($tag,1);
679: # &Apache::lonxml::debug("have:$tag:");
680: while (($depth >=0) && ($token = $pars->get_token)) {
681: # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]");
682: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
683: $result.=$token->[1];
684: } elsif ($token->[0] eq 'PI') {
685: $result.=$token->[2];
686: } elsif ($token->[0] eq 'S') {
687: if ($token->[1] eq $tag) { $depth++; }
688: $result.=$token->[4];
689: } elsif ($token->[0] eq 'E') {
690: if ( $token->[1] eq $tag) { $depth--; }
691: #skip sending back the last end tag
692: if ($depth > -1) { $result.=$token->[2]; } else {
693: $pars->unget_token($token);
694: }
695: }
696: }
697: } else {
698: while ($token = $pars->get_token) {
699: # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
700: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
701: $result.=$token->[1];
702: } elsif ($token->[0] eq 'PI') {
703: $result.=$token->[2];
704: } elsif ($token->[0] eq 'S') {
705: if ( $token->[1] eq $tag) {
706: $pars->unget_token($token); last;
707: } else {
708: $result.=$token->[4];
709: }
710: } elsif ($token->[0] eq 'E') {
711: $result.=$token->[2];
712: }
713: }
714: }
715: # &Apache::lonxml::debug("Exit:$result:");
716: return $result
717: }
718:
719: sub newparser {
720: my ($parser,$contentref,$dir) = @_;
721: push (@$parser,HTML::TokeParser->new($contentref));
722: $$parser['-1']->xml_mode('1');
723: if ( $dir eq '' ) {
724: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
725: } else {
726: push (@Apache::lonxml::pwd, $dir);
727: }
728: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
729: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
730: }
731:
732: sub parstring {
733: my ($token) = @_;
734: my $temp='';
735: map {
736: unless ($_=~/\W/) {
737: my $val=$token->[2]->{$_};
738: $val =~ s/([\%\@\\])/\\$1/g;
739: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
740: $temp .= "my \$$_=\"$val\";"
741: }
742: } @{$token->[3]};
743: return $temp;
744: }
745:
746: sub writeallows {
747: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
748: my $thisdir=$thisurl;
749: $thisdir=~s/\/[^\/]+$//;
750: my %httpref=();
751: map {
752: $httpref{'httpref.'.
753: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
754: &Apache::lonnet::appenv(%httpref);
755: }
756:
757: #
758: # Afterburner handles anchors, highlights and links
759: #
760: sub afterburn {
761: my $result=shift;
762: map {
763: my ($name, $value) = split(/=/,$_);
764: $value =~ tr/+/ /;
765: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
766: if (($name eq 'highlight')||($name eq 'anchor')||($name eq 'link')) {
767: unless ($ENV{'form.'.$name}) {
768: $ENV{'form.'.$name}=$value;
769: }
770: }
771: } (split(/&/,$ENV{'QUERY_STRING'}));
772: if ($ENV{'form.highlight'}) {
773: map {
774: my $anchorname=$_;
775: my $matchthis=$anchorname;
776: $matchthis=~s/\_+/\\s\+/g;
777: $result=~s/($matchthis)/\<font color=\"red\"\>$1\<\/font\>/gs;
778: } split(/\,/,$ENV{'form.highlight'});
779: }
780: if ($ENV{'form.link'}) {
781: map {
782: my ($anchorname,$linkurl)=split(/\>/,$_);
783: my $matchthis=$anchorname;
784: $matchthis=~s/\_+/\\s\+/g;
785: $result=~s/($matchthis)/\<a href=\"$linkurl\"\>$1\<\/a\>/gs;
786: } split(/\,/,$ENV{'form.link'});
787: }
788: if ($ENV{'form.anchor'}) {
789: my $anchorname=$ENV{'form.anchor'};
790: my $matchthis=$anchorname;
791: $matchthis=~s/\_+/\\s\+/g;
792: $result=~s/($matchthis)/\<a name=\"$anchorname\"\>$1\<\/a\>/s;
793: $result.=(<<"ENDSCRIPT");
794: <script>
795: document.location.hash='$anchorname';
796: </script>
797: ENDSCRIPT
798: }
799: return $result;
800: }
801:
802: sub storefile {
803: my ($file,$contents)=@_;
804: if (my $fh=Apache::File->new('>'.$file)) {
805: print $fh $contents;
806: $fh->close();
807: }
808: }
809:
810: sub inserteditinfo {
811: my ($result,$filecontents)=@_;
812: unless ($filecontents) {
813: $filecontents=(<<SIMPLECONTENT);
814: <html>
815: <head>
816: <title>
817: Title of Document Goes Here
818: </title>
819: </head>
820: <body bgcolor="#FFFFFF">
821:
822: Body of Document Goes Here
823:
824: </body>
825: </html>
826: SIMPLECONTENT
827: }
828: my $editheader='<a href="#editsection">Edit below</a><hr />';
829: my $editfooter=(<<ENDFOOTER);
830: <hr />
831: <a name="editsection" />
832: <form method="post">
833: <textarea cols="80" rows="40" name="filecont">$filecontents</textarea>
834: <br />
835: <input type="submit" name="attemptclean"
836: value="Save and then attempt to clean HTML" />
837: <input type="submit" name="savethisfile" value="Save this" />
838: </form>
839: ENDFOOTER
840: $result=~s/(\<body[^\>]*\>)/$1$editheader/is;
841: $result=~s/(\<\/body\>)/$editfooter/is;
842: return $result;
843: }
844:
845: sub handler {
846: my $request=shift;
847:
848: my $target='web';
849:
850: $Apache::lonxml::debug=0;
851:
852: if ($ENV{'browser.mathml'}) {
853: $request->content_type('text/xml');
854: } else {
855: $request->content_type('text/html');
856: }
857:
858: $request->send_http_header;
859:
860: return OK if $request->header_only;
861:
862:
863: my $file=&Apache::lonnet::filelocation("",$request->uri);
864: #
865: # Edit action? Save file.
866: #
867: unless ($ENV{'request.state'} eq 'published') {
868: if (($ENV{'form.savethisfile'}) || ($ENV{'form.attemptclean'})) {
869: &storefile($file,$ENV{'form.filecont'});
870: }
871: }
872: my %mystyle;
873: my $result = '';
874: my $filecontents=&Apache::lonnet::getfile($file);
875: if ($filecontents == -1) {
876: $result=(<<ENDNOTFOUND);
877: <html>
878: <head>
879: <title>File not found</title>
880: </head>
881: <body bgcolor="#FFFFFF">
882: <b>File not found: $file</b>
883: </body>
884: </html>
885: ENDNOTFOUND
886: $filecontents='';
887: } else {
888: unless ($ENV{'request.state'} eq 'published') {
889: if ($ENV{'form.attemptclean'}) {
890: $filecontents=&htmlclean($filecontents,1);
891: }
892: }
893: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
894: }
895:
896: #
897: # Edit action? Insert editing commands
898: #
899: unless ($ENV{'request.state'} eq 'published') {
900: $result=&inserteditinfo($result,$filecontents);
901: }
902:
903: $request->print($result);
904:
905: writeallows($request->uri);
906: return OK;
907: }
908:
909: sub debug {
910: if ($Apache::lonxml::debug eq 1) {
911: print("DEBUG:".$_[0]."<br />\n");
912: }
913: }
914:
915: sub error {
916: if (($Apache::lonxml::debug eq 1) || ($ENV{'request.state'} eq 'construct') ) {
917: print "<b>ERROR:</b>".$_[0]."<br />\n";
918: } else {
919: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
920: #notify author
921: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
922: #notify course
923: if ( $ENV{'request.course.id'} ) {
924: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
925: foreach my $user (split /\,/, $users) {
926: ($user,my $domain) = split /:/, $user;
927: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
928: }
929: }
930:
931: #FIXME probably shouldn't have me get everything forever.
932: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
933: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
934: }
935: }
936:
937: sub warning {
938: if ($ENV{'request.state'} eq 'construct') {
939: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
940: }
941: }
942:
943: sub get_param {
944: my ($param,$parstack,$safeeval,$context) = @_;
945: if ( ! $context ) { $context = -1; }
946: my $args ='';
947: if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
948: return &Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
949: }
950:
951: sub register_insert {
952: my @data = split /\n/, &Apache::lonnet::getfile('/home/httpd/lonTabs/insertlist.tab');
953: my $i;
954: my $tagnum=0;
955: my @order;
956: for ($i=0;$i < $#data; $i++) {
957: my $line = $data[$i];
958: if ( $line =~ /^\#/ || $line =~ /^\s*\n/) { next; }
959: if ( $line =~ /TABLE/ ) { last; }
960: my ($tag,$descrip,$color,$function,$show) = split(/,/, $line);
961: $insertlist{"$tagnum.tag"} = $tag;
962: $insertlist{"$tagnum.description"} = $descrip;
963: $insertlist{"$tagnum.color"} = $color;
964: $insertlist{"$tagnum.function"} = $function;
965: $insertlist{"$tagnum.show"}= $show;
966: $insertlist{"$tag.num"}=$tagnum;
967: $tagnum++;
968: }
969: $i++; #skipping TABLE line
970: $tagnum = 0;
971: for (;$i < $#data;$i++) {
972: my $line = $data[$i];
973: my ($mnemonic,@which) = split(/ +/,$line);
974: my $tag = $insertlist{"$tagnum.tag"};
975: for (my $j=0;$j <$#which;$j++) {
976: if ( $which[$j] eq 'Y' ) {
977: if ($insertlist{"$j.show"} ne 'no') {
978: push(@{ $insertlist{"$tag.which"} },$j);
979: }
980: }
981: }
982: $tagnum++;
983: }
984: }
985:
986: sub description {
987: my ($token)=@_;
988: return $insertlist{$insertlist{"$token->[1].num"}.'.description'};
989: }
990: 1;
991: __END__
992:
993:
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