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:
9: package Apache::lonxml;
10: use vars
11: qw(@pwd @outputstack $redirection $textredirection $import @extlinks $metamode);
12: use strict;
13: use HTML::TokeParser;
14: use Safe;
15: use Safe::Hole;
16: use Opcode;
17: use Apache::Constants qw(:common);
18:
19: sub register {
20: my $space;
21: my @taglist;
22: my $temptag;
23: ($space,@taglist) = @_;
24: foreach $temptag (@taglist) {
25: $Apache::lonxml::alltags{$temptag}=$space;
26: }
27: }
28:
29: sub printalltags {
30: my $temp;
31: foreach $temp (sort keys %Apache::lonxml::alltags) {
32: &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
33: }
34: }
35: use Apache::style;
36: use Apache::lontexconvert;
37: use Apache::run;
38: use Apache::londefdef;
39: use Apache::scripttag;
40: use Apache::edit;
41: #================================================== Main subroutine: xmlparse
42: @pwd=();
43: @outputstack = ();
44: $redirection = 0;
45: $import = 1;
46: @extlinks=();
47: $metamode = 0;
48:
49: sub xmlparse {
50:
51: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
52: if ($target eq 'meta') {
53: # meta mode is a bit weird only some output is to be turned off
54: $Apache::lonxml::redirection = 0;
55: $Apache::lonxml::metamode = 1;
56: $Apache::lonxml::import = 0;
57: } elsif ($target eq 'grade') {
58: &startredirection;
59: $Apache::lonxml::metamode = 0;
60: $Apache::lonxml::import = 1;
61: } else {
62: $Apache::lonxml::metamode = 0;
63: $Apache::lonxml::redirection = 0;
64: $Apache::lonxml::import = 1;
65: }
66: #&printalltags();
67: my @pars = ();
68: @Apache::lonxml::pwd=();
69: my $pwd=$ENV{'request.filename'};
70: $pwd =~ s:/[^/]*$::;
71: &newparser(\@pars,\$content_file_string,$pwd);
72: my $currentstring = '';
73: my $finaloutput = '';
74: my $newarg = '';
75: my $result;
76:
77: my $safeeval = new Safe;
78: my $safehole = new Safe::Hole;
79: $safeeval->permit("entereval");
80: $safeeval->permit(":base_math");
81: $safeeval->deny(":base_io");
82: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
83: #need to inspect this class of ops
84: # $safeeval->deny(":base_orig");
85: $safeinit .= ';$external::target='.$target.';';
86: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
87: &Apache::run::run($safeinit,$safeeval);
88: #-------------------- Redefinition of the target in the case of compound target
89:
90: ($target, my @tenta) = split('&&',$target);
91:
92: my @stack = ();
93: my @parstack = ();
94: &initdepth;
95: my $token;
96: while ( $#pars > -1 ) {
97: while ($token = $pars[$#pars]->get_token) {
98: if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
99: if (!$metamode) { $result=$token->[1]; }
100: } elsif ($token->[0] eq 'PI') {
101: if (!$metamode) { $result=$token->[2]; }
102: } elsif ($token->[0] eq 'S') {
103: # add tag to stack
104: push (@stack,$token->[1]);
105: # add parameters list to another stack
106: push (@parstack,&parstring($token));
107: &increasedepth($token);
108: if (exists $style_for_target{$token->[1]}) {
109: if ($metamode) {
110: $result = $style_for_target{$token->[1]};
111: } elsif ($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 ($metamode) {
132: $result = $style_for_target{$token->[1]};
133: } elsif ($Apache::lonxml::redirection) {
134: $Apache::lonxml::outputstack['-1'] .=
135: &recurse($style_for_target{'/'."$token->[1]"},
136: $target,$safeeval,\%style_for_target,@parstack);
137: } else {
138: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
139: $target,$safeeval,\%style_for_target,
140: @parstack);
141: }
142:
143: } else {
144: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
145: \@pars,$safeeval, \%style_for_target);
146: }
147: } else {
148: &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
149: }
150: #evaluate variable refs in result
151: if ($result ne "") {
152: if ( $#parstack > -1 ) {
153: if ($Apache::lonxml::redirection) {
154: $Apache::lonxml::outputstack['-1'] .=
155: &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]);
156: } else {
157: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
158: $parstack[$#parstack]);
159: }
160: } else {
161: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
162: }
163: $result = '';
164: }
165: if ($token->[0] eq 'E') {
166: pop @stack;pop @parstack;&decreasedepth($token);
167: }
168: }
169: pop @pars;
170: pop @Apache::lonxml::pwd;
171: }
172:
173: # if ($target eq 'meta') {
174: # $finaloutput.=&endredirection;
175: # }
176: return $finaloutput;
177: }
178:
179: sub recurse {
180:
181: my @innerstack = ();
182: my @innerparstack = ();
183: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
184: my @pat = ();
185: &newparser(\@pat,\$newarg);
186: my $tokenpat;
187: my $partstring = '';
188: my $output='';
189: my $decls='';
190: while ( $#pat > -1 ) {
191: while ($tokenpat = $pat[$#pat]->get_token) {
192: if (($tokenpat->[0] eq 'T') || ($tokenpat->[0] eq 'C') || ($tokenpat->[0] eq 'D') ) {
193: $partstring = $tokenpat->[1];
194: } elsif ($tokenpat->[0] eq 'PI') {
195: $partstring = $tokenpat->[2];
196: } elsif ($tokenpat->[0] eq 'S') {
197: push (@innerstack,$tokenpat->[1]);
198: push (@innerparstack,&parstring($tokenpat));
199: &increasedepth($tokenpat);
200: $partstring = &callsub("start_$tokenpat->[1]",
201: $target, $tokenpat, \@innerparstack,
202: \@pat, $safeeval, $style_for_target);
203: } elsif ($tokenpat->[0] eq 'E') {
204: #clear out any tags that didn't end
205: while ($tokenpat->[1] ne $innerstack[$#innerstack]
206: && ($#innerstack > -1)) {
207: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']");
208: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
209: }
210: $partstring = &callsub("end_$tokenpat->[1]",
211: $target, $tokenpat, \@innerparstack,
212: \@pat, $safeeval, $style_for_target);
213: } else {
214: &Apache::lonxml::error("Unknown token event :$tokenpat->[0]:$tokenpat->[1]:");
215: }
216: #pass both the variable to the style tag, and the tag we
217: #are processing inside the <definedtag>
218: if ( $partstring ne "" ) {
219: if ( $#parstack > -1 ) {
220: if ( $#innerparstack > -1 ) {
221: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
222: } else {
223: $decls= $parstack[$#parstack];
224: }
225: } else {
226: if ( $#innerparstack > -1 ) {
227: $decls=$innerparstack[$#innerparstack];
228: } else {
229: $decls='';
230: }
231: }
232: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
233: $partstring = '';
234: }
235: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
236: &decreasedepth($tokenpat);}
237: }
238: pop @pat;
239: pop @Apache::lonxml::pwd;
240: }
241: return $output;
242: }
243:
244: sub callsub {
245: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
246: my $currentstring='';
247: {
248: my $sub1;
249: no strict 'refs';
250: if ($target eq 'edit' && $token->[0] eq 'S') {
251: $currentstring = &Apache::edit::tag_start($target,$token,$parstack,$parser,
252: $safeeval,$style);
253: }
254: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
255: #&Apache::lonxml::debug("Calling sub $sub in $space<br />\n");
256: $sub1="$space\:\:$sub";
257: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
258: $currentstring .= &$sub1($target,$token,$parstack,$parser,
259: $safeeval,$style);
260: } else {
261: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br />\n");
262: if (defined($token->[4]) && !$metamode) {
263: $currentstring .= $token->[4];
264: } else {
265: $currentstring .= $token->[2];
266: }
267: }
268: if ($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: sub handler {
412: my $request=shift;
413:
414: my $target='web';
415: $Apache::lonxml::debug=0;
416: if ($ENV{'browser.mathml'}) {
417: $request->content_type('text/xml');
418: } else {
419: $request->content_type('text/html');
420: }
421:
422: # $request->print(<<ENDHEADER);
423: #<html>
424: #<head>
425: #<title>Just test</title>
426: #</head>
427: #<body bgcolor="#FFFFFF">
428: #ENDHEADER
429: # &Apache::lonhomework::send_header($request);
430: $request->send_http_header;
431:
432: return OK if $request->header_only;
433:
434: $request->print(&Apache::lontexconvert::header());
435:
436: $request->print('<body bgcolor="#FFFFFF">'."\n");
437:
438: my $file=&Apache::lonnet::filelocation("",$request->uri);
439: my %mystyle;
440: my $result = '';
441: my $filecontents=&Apache::lonnet::getfile($file);
442: if ($filecontents == -1) {
443: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
444: $filecontents='';
445: } else {
446: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
447: }
448: $request->print($result);
449:
450:
451: $request->print('</body>');
452: $request->print(&Apache::lontexconvert::footer());
453: writeallows($request->uri);
454: return OK;
455: }
456:
457: $Apache::lonxml::debug=0;
458: sub debug {
459: if ($Apache::lonxml::debug eq 1) {
460: print "DEBUG:".$_[0]."<br />\n";
461: }
462: }
463:
464: sub error {
465: if ($Apache::lonxml::debug eq 1) {
466: print "<b>ERROR:</b>".$_[0]."<br />\n";
467: } else {
468: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
469: #notify author
470: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
471: #notify course
472: if ( $ENV{'request.course.id'} ) {
473: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
474: foreach my $user (split /\,/, $users) {
475: ($user,my $domain) = split /:/, $user;
476: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
477: }
478: }
479:
480: #FIXME probably shouldn't have me get everything forever.
481: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
482: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
483: }
484: }
485:
486: sub warning {
487: if ($Apache::lonxml::debug eq 1) {
488: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
489: }
490: }
491:
492: 1;
493: __END__
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