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