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: # &Apache::lonxml::debug("Checking for $token->[1] style");
110: if (exists $style_for_target{$token->[1]}) {
111: # &Apache::lonxml::debug("Found $token->[1] style");
112: if ($Apache::lonxml::redirection) {
113: $Apache::lonxml::outputstack['-1'] .=
114: &recurse($style_for_target{$token->[1]},$target,$safeeval,
115: \%style_for_target,@parstack);
116: } else {
117: $finaloutput .= &recurse($style_for_target{$token->[1]},$target,
118: $safeeval,\%style_for_target,@parstack);
119: }
120: } else {
121: # &Apache::lonxml::debug("No style for for $token->[1]");
122: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
123: \@pars, $safeeval, \%style_for_target);
124: }
125: } elsif ($token->[0] eq 'E') {
126: #clear out any tags that didn't end
127: while ($token->[1] ne $stack[$#stack] && ($#stack > -1)) {
128: &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']");
129: pop @stack;pop @parstack;&decreasedepth($token);
130: }
131:
132: if (exists $style_for_target{'/'."$token->[1]"}) {
133: if ($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') || ($tokenpat->[0] eq 'D') ) {
193: if ($metamode<1) { $partstring=$tokenpat->[1]; }
194: } elsif ($tokenpat->[0] eq 'PI') {
195: if ($metamode<1) { $partstring=$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 $metamode<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 $metamode<br />\n");
262: if ($metamode <1) {
263: if (defined($token->[4]) && ($metamode < 1)) {
264: $currentstring .= $token->[4];
265: } else {
266: $currentstring .= $token->[2];
267: }
268: }
269: }
270: if ($target eq 'edit' && $token->[0] eq 'E') {
271: $currentstring .= &Apache::edit::tag_end($target,$token,$parstack,$parser,
272: $safeeval,$style);
273: }
274: use strict 'refs';
275: }
276: return $currentstring;
277: }
278:
279: sub startredirection {
280: $Apache::lonxml::redirection++;
281: push (@Apache::lonxml::outputstack, '');
282: }
283:
284: sub endredirection {
285: if (!$Apache::lonxml::redirection) {
286: &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuggin information:".join ":",caller);
287: return '';
288: }
289: $Apache::lonxml::redirection--;
290: pop @Apache::lonxml::outputstack;
291: }
292:
293: sub initdepth {
294: @Apache::lonxml::depthcounter=();
295: $Apache::lonxml::depth=-1;
296: $Apache::lonxml::olddepth=-1;
297: }
298:
299: sub increasedepth {
300: my ($token) = @_;
301: $Apache::lonxml::depth++;
302: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
303: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
304: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
305: }
306: my $curdepth=join('_',@Apache::lonxml::depthcounter);
307: # &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
308: #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
309: }
310:
311: sub decreasedepth {
312: my ($token) = @_;
313: $Apache::lonxml::depth--;
314: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
315: $#Apache::lonxml::depthcounter--;
316: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
317: }
318: if ( $Apache::lonxml::depth < -1) {
319: &Apache::lonxml::warning("Unbalanced tags in resource");
320: $Apache::lonxml::depth='-1';
321: }
322: my $curdepth=join('_',@Apache::lonxml::depthcounter);
323: # &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
324: #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
325: }
326:
327: sub get_all_text {
328:
329: my($tag,$pars)= @_;
330: my $depth=0;
331: my $token;
332: my $result='';
333: if ( $tag =~ m:^/: ) {
334: my $tag=substr($tag,1);
335: # &Apache::lonxml::debug("have:$tag:");
336: while (($depth >=0) && ($token = $pars->get_token)) {
337: # &Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]");
338: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
339: $result.=$token->[1];
340: } elsif ($token->[0] eq 'PI') {
341: $result.=$token->[2];
342: } elsif ($token->[0] eq 'S') {
343: if ($token->[1] eq $tag) { $depth++; }
344: $result.=$token->[4];
345: } elsif ($token->[0] eq 'E') {
346: if ( $token->[1] eq $tag) { $depth--; }
347: #skip sending back the last end tag
348: if ($depth > -1) { $result.=$token->[2]; } else {
349: $pars->unget_token($token);
350: }
351: }
352: }
353: } else {
354: while ($token = $pars->get_token) {
355: # &Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
356: if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
357: $result.=$token->[1];
358: } elsif ($token->[0] eq 'PI') {
359: $result.=$token->[2];
360: } elsif ($token->[0] eq 'S') {
361: if ( $token->[1] eq $tag) {
362: $pars->unget_token($token); last;
363: } else {
364: $result.=$token->[4];
365: }
366: } elsif ($token->[0] eq 'E') {
367: $result.=$token->[2];
368: }
369: }
370: }
371: # &Apache::lonxml::debug("Exit:$result:");
372: return $result
373: }
374:
375: sub newparser {
376: my ($parser,$contentref,$dir) = @_;
377: push (@$parser,HTML::TokeParser->new($contentref));
378: $$parser['-1']->xml_mode('1');
379: if ( $dir eq '' ) {
380: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
381: } else {
382: push (@Apache::lonxml::pwd, $dir);
383: }
384: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
385: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
386: }
387:
388: sub parstring {
389: my ($token) = @_;
390: my $temp='';
391: map {
392: unless ($_=~/\W/) {
393: my $val=$token->[2]->{$_};
394: $val =~ s/([\%\@\\])/\\$1/g;
395: #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
396: $temp .= "my \$$_=\"$val\";"
397: }
398: } @{$token->[3]};
399: return $temp;
400: }
401:
402: sub writeallows {
403: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
404: my $thisdir=$thisurl;
405: $thisdir=~s/\/[^\/]+$//;
406: my %httpref=();
407: map {
408: $httpref{'httpref.'.
409: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
410: &Apache::lonnet::appenv(%httpref);
411: }
412:
413: sub handler {
414: my $request=shift;
415:
416: my $target='tex';
417: $Apache::lonxml::debug=1;
418: if ($ENV{'browser.mathml'}) {
419: $request->content_type('text/xml');
420: } else {
421: $request->content_type('text/html');
422: }
423:
424: # $request->print(<<ENDHEADER);
425: #<html>
426: #<head>
427: #<title>Just test</title>
428: #</head>
429: #<body bgcolor="#FFFFFF">
430: #ENDHEADER
431: # &Apache::lonhomework::send_header($request);
432: $request->send_http_header;
433:
434: return OK if $request->header_only;
435:
436: ## $request->print(&Apache::lontexconvert::header());
437:
438: ## $request->print('<body bgcolor="#FFFFFF">'."\n");
439:
440: if ($target eq 'tex') {
441:
442:
443:
444: } else {
445: $request->print(&Apache::lontexconvert::header());
446: $request->print('<body bgcolor="#FFFFFF">'."\n");
447: }
448:
449: my $file=&Apache::lonnet::filelocation("",$request->uri);
450: my %mystyle;
451: my $result = '';
452: my $filecontents=&Apache::lonnet::getfile($file);
453: if ($filecontents == -1) {
454: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
455: $filecontents='';
456: } else {
457: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
458: }
459: $request->print($result);
460:
461:
462: ## $request->print('</body>');
463: if ($target eq 'tex') {
464: # $request->print('\end{document}'."\n");
465: } else {
466: $request->print('</body>');
467: $request->print(&Apache::lontexconvert::footer());
468: }
469: ## $request->print(&Apache::lontexconvert::footer());
470: writeallows($request->uri);
471: return OK;
472: }
473:
474: $Apache::lonxml::debug=0;
475: sub debug {
476: if ($Apache::lonxml::debug eq 1) {
477: print "DEBUG:".$_[0]."<br />\n";
478: }
479: }
480:
481: sub error {
482: if ($Apache::lonxml::debug eq 1) {
483: print "<b>ERROR:</b>".$_[0]."<br />\n";
484: } else {
485: print "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />";
486: #notify author
487: &Apache::lonmsg::author_res_msg($ENV{'request.filename'},$_[0]);
488: #notify course
489: if ( $ENV{'request.course.id'} ) {
490: my $users=$ENV{'course.'.$ENV{'request.course.id'}.'.comment.email'};
491: foreach my $user (split /\,/, $users) {
492: ($user,my $domain) = split /:/, $user;
493: &Apache::lonmsg::user_normal_msg($user,$domain,"Error in $ENV{'request.filename'}",$_[0]);
494: }
495: }
496:
497: #FIXME probably shouldn't have me get everything forever.
498: &Apache::lonmsg::user_normal_msg('albertel','msu',"Error in $ENV{'request.filename'}",$_[0]);
499: #&Apache::lonmsg::user_normal_msg('albertel','103',"Error in $ENV{'request.filename'}",$_[0]);
500: }
501: }
502:
503: sub warning {
504: if ($Apache::lonxml::debug eq 1) {
505: print "<b>W</b>ARNING<b>:</b>".$_[0]."<br />\n";
506: }
507: }
508:
509: 1;
510: __END__
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>
![[BACK]](/icons/back.gif){kind=icon}
Return to lonxml.pm CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [LON-CAPA] / loncom / xml