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