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 Gerd Kortemeyer
9:
10: package Apache::lonxml;
11: use vars
12: qw(@pwd @outputstack $redirection $import @extlinks $metamode);
13: use strict;
14: use HTML::TokeParser;
15: use Safe;
16: use Safe::Hole;
17: use Opcode;
18: use Apache::Constants qw(:common);
19:
20: sub register {
21: my $space;
22: my @taglist;
23: my $temptag;
24: ($space,@taglist) = @_;
25: foreach $temptag (@taglist) {
26: $Apache::lonxml::alltags{$temptag}=$space;
27: }
28: }
29:
30: sub printalltags {
31: my $temp;
32: foreach $temp (sort keys %Apache::lonxml::alltags) {
33: &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
34: }
35: }
36: use Apache::style;
37: use Apache::lontexconvert;
38: use Apache::run;
39: use Apache::londefdef;
40: use Apache::scripttag;
41: use Apache::edit;
42: #================================================== Main subroutine: xmlparse
43: @pwd=();
44: @outputstack = ();
45: $redirection = 0;
46: $import = 1;
47: @extlinks=();
48: $metamode = 0;
49:
50: sub xmlparse {
51:
52: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
53: if ($target eq 'meta') {
54: # meta mode is a bit weird only some output is to be turned off
55: #<output> tag turns metamode off (defined in londefdef.pm)
56: $Apache::lonxml::redirection = 0;
57: $Apache::lonxml::metamode = 1;
58: $Apache::lonxml::import = 0;
59: } elsif ($target eq 'grade') {
60: &startredirection;
61: $Apache::lonxml::metamode = 0;
62: $Apache::lonxml::import = 1;
63: } else {
64: $Apache::lonxml::metamode = 0;
65: $Apache::lonxml::redirection = 0;
66: $Apache::lonxml::import = 1;
67: }
68: #&printalltags();
69: my @pars = ();
70: @Apache::lonxml::pwd=();
71: my $pwd=$ENV{'request.filename'};
72: $pwd =~ s:/[^/]*$::;
73: &newparser(\@pars,\$content_file_string,$pwd);
74: my $currentstring = '';
75: my $finaloutput = '';
76: my $newarg = '';
77: my $result;
78:
79: my $safeeval = new Safe;
80: my $safehole = new Safe::Hole;
81: $safeeval->permit("entereval");
82: $safeeval->permit(":base_math");
83: $safeeval->deny(":base_io");
84: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
85: #need to inspect this class of ops
86: # $safeeval->deny(":base_orig");
87: $safeinit .= ';$external::target='.$target.';';
88: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
89: &Apache::run::run($safeinit,$safeeval);
90: #-------------------- Redefinition of the target in the case of compound target
91:
92: ($target, my @tenta) = split('&&',$target);
93:
94: my @stack = ();
95: my @parstack = ();
96: &initdepth;
97: my $token;
98: while ( $#pars > -1 ) {
99: while ($token = $pars[$#pars]->get_token) {
100: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
101: if ($metamode<1) { $result=$token->[1]; }
102: } elsif ($token->[0] eq 'PI') {
103: if ($metamode<1) { $result=$token->[2]; }
104: } elsif ($token->[0] eq 'S') {
105: # add tag to stack
106: push (@stack,$token->[1]);
107: # add parameters list to another stack
108: push (@parstack,&parstring($token));
109: &increasedepth($token);
110: if (exists $style_for_target{$token->[1]}) {
111: if ($Apache::lonxml::redirection) {
112: $Apache::lonxml::outputstack['-1'] .=
113: &recurse($style_for_target{$token->[1]},$target,$safeeval,
114: \%style_for_target,@parstack);
115: } else {
116: $finaloutput .= &recurse($style_for_target{$token->[1]},$target,
117: $safeeval,\%style_for_target,@parstack);
118: }
119: } else {
120: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
121: \@pars, $safeeval, \%style_for_target);
122: }
123: } elsif ($token->[0] eq 'E') {
124: #clear out any tags that didn't end
125: while ($token->[1] ne $stack[$#stack] && ($#stack > -1)) {
126: &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']");
127: pop @stack;pop @parstack;&decreasedepth($token);
128: }
129:
130: if (exists $style_for_target{'/'."$token->[1]"}) {
131: if ($Apache::lonxml::redirection) {
132: $Apache::lonxml::outputstack['-1'] .=
133: &recurse($style_for_target{'/'."$token->[1]"},
134: $target,$safeeval,\%style_for_target,@parstack);
135: } else {
136: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
137: $target,$safeeval,\%style_for_target,
138: @parstack);
139: }
140:
141: } else {
142: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
143: \@pars,$safeeval, \%style_for_target);
144: }
145: } else {
146: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
147: }
148: #evaluate variable refs in result
149: if ($result ne "") {
150: if ( $#parstack > -1 ) {
151: if ($Apache::lonxml::redirection) {
152: $Apache::lonxml::outputstack['-1'] .=
153: &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]);
154: } else {
155: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
156: $parstack[$#parstack]);
157: }
158: } else {
159: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
160: }
161: $result = '';
162: }
163: if ($token->[0] eq 'E') {
164: pop @stack;pop @parstack;&decreasedepth($token);
165: }
166: }
167: pop @pars;
168: pop @Apache::lonxml::pwd;
169: }
170:
171: # if ($target eq 'meta') {
172: # $finaloutput.=&endredirection;
173: # }
174: return $finaloutput;
175: }
176:
177: sub recurse {
178:
179: my @innerstack = ();
180: my @innerparstack = ();
181: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
182: my @pat = ();
183: &newparser(\@pat,\$newarg);
184: my $tokenpat;
185: my $partstring = '';
186: my $output='';
187: my $decls='';
188: while ( $#pat > -1 ) {
189: while ($tokenpat = $pat[$#pat]->get_token) {
190: if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) {
191: if ($metamode<1) { $partstring=$tokenpat->[1]; }
192: } elsif ($tokenpat->[0] eq 'PI') {
193: if ($metamode<1) { $partstring=$tokenpat->[2]; }
194: } elsif ($tokenpat->[0] eq 'S') {
195: push (@innerstack,$tokenpat->[1]);
196: push (@innerparstack,&parstring($tokenpat));
197: &increasedepth($tokenpat);
198: $partstring = &callsub("start_$tokenpat->[1]",
199: $target, $tokenpat, \@innerparstack,
200: \@pat, $safeeval, $style_for_target);
201: } elsif ($tokenpat->[0] eq 'E') {
202: #clear out any tags that didn't end
203: while ($tokenpat->[1] ne $innerstack[$#innerstack]
204: && ($#innerstack > -1)) {
205: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']");
206: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
207: }
208: $partstring = &callsub("end_$tokenpat->[1]",
209: $target, $tokenpat, \@innerparstack,
210: \@pat, $safeeval, $style_for_target);
211: } else {
212: &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:");
213: }
214: #pass both the variable to the style tag, and the tag we
215: #are processing inside the <definedtag>
216: if ( $partstring ne "" ) {
217: if ( $#parstack > -1 ) {
218: if ( $#innerparstack > -1 ) {
219: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
220: } else {
221: $decls= $parstack[$#parstack];
222: }
223: } else {
224: if ( $#innerparstack > -1 ) {
225: $decls=$innerparstack[$#innerparstack];
226: } else {
227: $decls='';
228: }
229: }
230: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
231: $partstring = '';
232: }
233: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
234: &decreasedepth($tokenpat);}
235: }
236: pop @pat;
237: pop @Apache::lonxml::pwd;
238: }
239: return $output;
240: }
241:
242: sub callsub {
243: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
244: my $currentstring='';
245: {
246: my $sub1;
247: no strict 'refs';
248: if ($target eq 'edit' && $token->[0] eq 'S') {
249: $currentstring = &Apache::edit::tag_start($target,$token,$parstack,$parser,
250: $safeeval,$style);
251: }
252: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
253: # &Apache::lonxml::debug("Calling sub $sub in $space $metamode<br />\n");
254: $sub1="$space\:\:$sub";
255: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
256: $currentstring .= &$sub1($target,$token,$parstack,$parser,
257: $safeeval,$style);
258: } else {
259: # &Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode<br />\n");
260: if ($metamode <1) {
261: if (defined($token->[4]) && ($metamode < 1)) {
262: $currentstring .= $token->[4];
263: } else {
264: $currentstring .= $token->[2];
265: }
266: }
267: }
268: if ($target eq 'edit' && $token->[0] eq 'E') {
269: $currentstring .= &Apache::edit::tag_end($target,$token,$parstack,$parser,
270: $safeeval,$style);
271: }
272: use strict 'refs';
273: }
274: return $currentstring;
275: }
276:
277: sub startredirection {
278: $Apache::lonxml::redirection++;
279: push (@Apache::lonxml::outputstack, '');
280: }
281:
282: sub endredirection {
283: if (!$Apache::lonxml::redirection) {
284: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuggin information:".join ":",caller);
285: return '';
286: }
287: $Apache::lonxml::redirection--;
288: pop @Apache::lonxml::outputstack;
289: }
290:
291: sub initdepth {
292: @Apache::lonxml::depthcounter=();
293: $Apache::lonxml::depth=-1;
294: $Apache::lonxml::olddepth=-1;
295: }
296:
297: sub increasedepth {
298: my ($token) = @_;
299: $Apache::lonxml::depth++;
300: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
301: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
302: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
303: }
304: my $curdepth=join('_',@Apache::lonxml::depthcounter);
305: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
306: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
307: }
308:
309: sub decreasedepth {
310: my ($token) = @_;
311: $Apache::lonxml::depth--;
312: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
313: $#Apache::lonxml::depthcounter--;
314: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
315: }
316: if ( $Apache::lonxml::depth < -1) {
317: &Apache::lonxml::warning("Unbalanced tags in resource");
318: $Apache::lonxml::depth='-1';
319: }
320: my $curdepth=join('_',@Apache::lonxml::depthcounter);
321: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
322: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
323: }
324:
325: sub get_all_text {
326:
327: my($tag,$pars)= @_;
328: my $depth=0;
329: my $token;
330: my $result='';
331: if ( $tag =~ m:^/: ) {
332: my $tag=substr($tag,1);
333: # &Apache::lonxml::debug("have:$tag:");
334: while (($depth >=0) && ($token = $pars->get_token)) {
335: # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]");
336: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
337: $result.=$token->[1];
338: } elsif ($token->[0] eq 'PI') {
339: $result.=$token->[2];
340: } elsif ($token->[0] eq 'S') {
341: if ($token->[1] eq $tag) { $depth++; }
342: $result.=$token->[4];
343: } elsif ($token->[0] eq 'E') {
344: if ( $token->[1] eq $tag) { $depth--; }
345: #skip sending back the last end tag
346: if ($depth > -1) { $result.=$token->[2]; } else {
347: $pars->unget_token($token);
348: }
349: }
350: }
351: } else {
352: while ($token = $pars->get_token) {
353: # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
354: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
355: $result.=$token->[1];
356: } elsif ($token->[0] eq 'PI') {
357: $result.=$token->[2];
358: } elsif ($token->[0] eq 'S') {
359: if ( $token->[1] eq $tag) {
360: $pars->unget_token($token); last;
361: } else {
362: $result.=$token->[4];
363: }
364: } elsif ($token->[0] eq 'E') {
365: $result.=$token->[2];
366: }
367: }
368: }
369: # &Apache::lonxml::debug("Exit:$result:");
370: return $result
371: }
372:
373: sub newparser {
374: my ($parser,$contentref,$dir) = @_;
375: push (@$parser,HTML::TokeParser->new($contentref));
376: $$parser['-1']->xml_mode('1');
377: if ( $dir eq '' ) {
378: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
379: } else {
380: push (@Apache::lonxml::pwd, $dir);
381: }
382: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
383: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
384: }
385:
386: sub parstring {
387: my ($token) = @_;
388: my $temp='';
389: map {
390: unless ($_=~/\W/) {
391: my $val=$token->[2]->{$_};
392: $val =~ s/([\%\@\\])/\\$1/g;
393: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
394: $temp .= "my \$$_=\"$val\";"
395: }
396: } @{$token->[3]};
397: return $temp;
398: }
399:
400: sub writeallows {
401: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
402: my $thisdir=$thisurl;
403: $thisdir=~s/\/[^\/]+$//;
404: my %httpref=();
405: map {
406: $httpref{'httpref.'.
407: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
408: &Apache::lonnet::appenv(%httpref);
409: }
410:
411: #
412: # Afterburner handles anchors, highlights and links
413: #
414:
415: sub afterburn {
416: my $result=shift;
417: map {
418: my ($name, $value) = split(/=/,$_);
419: $value =~ tr/+/ /;
420: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
421: if (($name eq 'highlight')||($name eq 'anchor')||($name eq 'link')) {
422: unless ($ENV{'form.'.$name}) {
423: $ENV{'form.'.$name}=$value;
424: }
425: }
426: } (split(/&/,$ENV{'QUERY_STRING'}));
427: if ($ENV{'form.highlight'}) {
428: map {
429: my $anchorname=$_;
430: my $matchthis=$anchorname;
431: $matchthis=~s/\_+/\\s\+/g;
432: $result=~s/($matchthis)/\<font color=\"red\"\>$1\<\/font\>/gs;
433: } split(/\,/,$ENV{'form.highlight'});
434: }
435: if ($ENV{'form.link'}) {
436: map {
437: my ($anchorname,$linkurl)=split(/\>/,$_);
438: my $matchthis=$anchorname;
439: $matchthis=~s/\_+/\\s\+/g;
440: $result=~s/($matchthis)/\<a href=\"$linkurl\"\>$1\<\/a\>/gs;
441: } split(/\,/,$ENV{'form.link'});
442: }
443: if ($ENV{'form.anchor'}) {
444: my $anchorname=$ENV{'form.anchor'};
445: my $matchthis=$anchorname;
446: $matchthis=~s/\_+/\\s\+/g;
447: $result=~s/($matchthis)/\<a name=\"$anchorname\"\>$1\<\/a\>/s;
448: $result.=(<<"ENDSCRIPT");
449: <script>
450: document.location.hash='$anchorname';
451: </script>
452: ENDSCRIPT
453: }
454: return $result;
455: }
456:
457: sub handler {
458: my $request=shift;
459:
460: my $target='web';
461: $Apache::lonxml::debug=0;
462: if ($ENV{'browser.mathml'}) {
463: $request->content_type('text/xml');
464: } else {
465: $request->content_type('text/html');
466: }
467:
468: # $request->print(<<ENDHEADER);
469: #<html>
470: #<head>
471: #<title>Just test</title>
472: #</head>
473: #<body bgcolor="#FFFFFF">
474: #ENDHEADER
475: # &Apache::lonhomework::send_header($request);
476: $request->send_http_header;
477:
478: return OK if $request->header_only;
479:
480: if ($target eq 'web') {
481: $request->print(&Apache::lontexconvert::header());
482: $request->print('<body bgcolor="#FFFFFF">'."\n");
483: }
484:
485: my $file=&Apache::lonnet::filelocation("",$request->uri);
486: my %mystyle;
487: my $result = '';
488: my $filecontents=&Apache::lonnet::getfile($file);
489: if ($filecontents == -1) {
490: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
491: $filecontents='';
492: } else {
493: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
494: }
495: #
496: # Afterburner
497: #
498: if ($ENV{'QUERY_STRING'}) {
499: $result=&afterburn($result);
500: }
501: $request->print($result);
502:
503:
504: if ($target eq 'tex') {
505: # $request->print('\end{document}'."\n");
506: } elsif ($target eq 'web') {
507: $request->print('</body>');
508: $request->print(&Apache::lontexconvert::footer());
509: }
510:
511: writeallows($request->uri);
512: return OK;
513: }
514:
515: $Apache::lonxml::debug=0;
516: sub debug {
517: if ($Apache::lonxml::debug eq 1) {
518: print "DEBUG:".$_[0]."<br />\n";
519: }
520: }
521:
522: sub error {
523: if ($Apache::lonxml::debug eq 1) {
524: print "<b>ERROR:</b>".$_[0]."<br />\n";
525: } else {
526: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
527: #notify author
528: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
529: #notify course
530: if ( $ENV{'request.course.id'} ) {
531: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
532: foreach my $user (split /\,/, $users) {
533: ($user,my $domain) = split /:/, $user;
534: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
535: }
536: }
537:
538: #FIXME probably shouldn't have me get everything forever.
539: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
540: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
541: }
542: }
543:
544: sub warning {
545: if ($Apache::lonxml::debug eq 1) {
546: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
547: }
548: }
549:
550: 1;
551: __END__
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