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:
7: package Apache::lonxml;
8: use vars
9: qw(@pwd $outputstack $redirection $textredirection $on_offimport @extlinks);
10: use strict;
11: use HTML::TokeParser;
12: use Safe;
13: use Safe::Hole;
14: use Opcode;
15:
16: sub register {
17: my $space;
18: my @taglist;
19: my $temptag;
20: ($space,@taglist) = @_;
21: foreach $temptag (@taglist) {
22: $Apache::lonxml::alltags{$temptag}=$space;
23: }
24: }
25:
26: use Apache::style;
27: use Apache::lontexconvert;
28: use Apache::run;
29: use Apache::londefdef;
30: use Apache::scripttag;
31: #================================================== Main subroutine: xmlparse
32: @pwd=();
33: $outputstack = '';
34: $redirection = 1;
35: $textredirection = 1;
36: $on_offimport = 0;
37: @extlinks=();
38:
39: sub xmlparse {
40:
41: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
42: if ($target eq 'meta') {
43: $Apache::lonxml::textredirection = 0;
44: $Apache::lonxml::on_offimport = 1;
45: } else {
46: $Apache::lonxml::textredirection = 1;
47: $Apache::lonxml::on_offimport = 0;
48: }
49: my @pars = ();
50: @Apache::lonxml::pwd=();
51: my $pwd=$ENV{'request.filename'};
52: $pwd =~ s:/[^/]*$::;
53: &newparser(\@pars,\$content_file_string,$pwd);
54: my $currentstring = '';
55: my $finaloutput = '';
56: my $newarg = '';
57: my $result;
58:
59: my $safeeval = new Safe;
60: my $safehole = new Safe::Hole;
61: $safeeval->permit("entereval");
62: $safeeval->permit(":base_math");
63: $safeeval->deny(":base_io");
64: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
65: #need to inspect this class of ops
66: # $safeeval->deny(":base_orig");
67: $safeinit .= ';$external::target='.$target.';';
68: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
69: &Apache::run::run($safeinit,$safeeval);
70: #-------------------- Redefinition of the target in the case of compound target
71:
72: ($target, my @tenta) = split('&&',$target);
73:
74: my @stack = ();
75: my @parstack = ();
76: &initdepth;
77: my $token;
78: while ( $#pars > -1 ) {
79: while ($token = $pars[$#pars]->get_token) {
80: if ($token->[0] eq 'T') {
81: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
82: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
83: } elsif ($token->[0] eq 'S') {
84: # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
85: # add tag to stack
86: push (@stack,$token->[1]);
87: # add parameters list to another stack
88: push (@parstack,&parstring($token));
89: &increasedepth($token);
90: if (exists $style_for_target{$token->[1]}) {
91:
92: if ($Apache::lonxml::redirection == 1) {
93: $finaloutput .= &recurse($style_for_target{$token->[1]},
94: $target,$safeeval,\%style_for_target,
95: @parstack);
96: } else {
97: $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
98: $target,$safeeval,\%style_for_target,
99: @parstack);
100: }
101:
102: } else {
103: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
104: \@pars, $safeeval, \%style_for_target);
105: }
106: } elsif ($token->[0] eq 'E') {
107: #if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
108: #clear out any tags that didn't end
109: while ($token->[1] ne $stack[$#stack]
110: && ($#stack > -1)) {
111: &Apache::lonxml::error("Unbalanced tags in resource $stack['-1']");
112: pop @stack;pop @parstack;&decreasedepth($token);
113: }
114:
115: if (exists $style_for_target{'/'."$token->[1]"}) {
116:
117: if ($Apache::lonxml::redirection == 1) {
118: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
119: $target,$safeeval,\%style_for_target,
120: @parstack);
121: } else {
122: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
123: $target,$safeeval,\%style_for_target,
124: @parstack);
125: }
126:
127: } else {
128: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
129: \@pars,$safeeval, \%style_for_target);
130: }
131: }
132: if ($result ne "") {
133: if ( $#parstack > -1 ) {
134:
135: if ($Apache::lonxml::redirection == 1) {
136: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
137: $parstack[$#parstack]);
138: } else {
139: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
140: $parstack[$#parstack]);
141: }
142:
143: } else {
144: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
145: }
146: $result = '';
147: } else {
148: $finaloutput .= $result;
149: }
150: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
151: }
152: pop @pars;
153: pop @Apache::lonxml::pwd;
154: }
155:
156: return $finaloutput;
157: }
158:
159: sub recurse {
160:
161: my @innerstack = ();
162: my @innerparstack = ();
163: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
164: my @pat = ();
165: &newparser(\@pat,\$newarg);
166: my $tokenpat;
167: my $partstring = '';
168: my $output='';
169: my $decls='';
170: while ( $#pat > -1 ) {
171: while ($tokenpat = $pat[$#pat]->get_token) {
172: if ($tokenpat->[0] eq 'T') {
173: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
174: } elsif ($tokenpat->[0] eq 'S') {
175: push (@innerstack,$tokenpat->[1]);
176: push (@innerparstack,&parstring($tokenpat));
177: &increasedepth($tokenpat);
178: $partstring = &callsub("start_$tokenpat->[1]",
179: $target, $tokenpat, \@innerparstack,
180: \@pat, $safeeval, $style_for_target);
181: } elsif ($tokenpat->[0] eq 'E') {
182: #clear out any tags that didn't end
183: while ($tokenpat->[1] ne $innerstack[$#innerstack]
184: && ($#innerstack > -1)) {
185: &Apache::lonxml::error("Unbalanced tags in resource $innerstack['-1']");
186: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
187: }
188: $partstring = &callsub("end_$tokenpat->[1]",
189: $target, $tokenpat, \@innerparstack,
190: \@pat, $safeeval, $style_for_target);
191: }
192: #pass both the variable to the style tag, and the tag we
193: #are processing inside the <definedtag>
194: if ( $partstring ne "" ) {
195: if ( $#parstack > -1 ) {
196: if ( $#innerparstack > -1 ) {
197: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
198: } else {
199: $decls= $parstack[$#parstack];
200: }
201: } else {
202: if ( $#innerparstack > -1 ) {
203: $decls=$innerparstack[$#innerparstack];
204: } else {
205: $decls='';
206: }
207: }
208: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
209: $partstring = '';
210: }
211: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
212: &decreasedepth($tokenpat);}
213: }
214: pop @pat;
215: pop @Apache::lonxml::pwd;
216: }
217: return $output;
218: }
219:
220: sub callsub {
221: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
222: my $currentstring='';
223: {
224: my $sub1;
225: no strict 'refs';
226: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
227: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
228: $sub1="$space\:\:$sub";
229: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
230: $currentstring = &$sub1($target,$token,$parstack,$parser,
231: $safeeval,$style);
232: } else {
233: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
234: if (defined($token->[4])) {
235: $currentstring = $token->[4];
236: } else {
237: $currentstring = $token->[2];
238: }
239: }
240: use strict 'refs';
241: }
242: return $currentstring;
243: }
244:
245: sub initdepth {
246: @Apache::lonxml::depthcounter=();
247: $Apache::lonxml::depth=-1;
248: $Apache::lonxml::olddepth=-1;
249: }
250:
251: sub increasedepth {
252: my ($token) = @_;
253: $Apache::lonxml::depth++;
254: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
255: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
256: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
257: }
258: my $curdepth=join('_',@Apache::lonxml::depthcounter);
259: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
260: #print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
261: }
262:
263: sub decreasedepth {
264: my ($token) = @_;
265: $Apache::lonxml::depth--;
266: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
267: $#Apache::lonxml::depthcounter--;
268: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
269: }
270: if ( $Apache::lonxml::depth < -1) {
271: &Apache::lonxml::error("Unbalanced tags in resource");
272: $Apache::lonxml::depth='-1';
273: }
274: my $curdepth=join('_',@Apache::lonxml::depthcounter);
275: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
276: #print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
277: }
278:
279: sub get_all_text {
280:
281: my($tag,$pars)= @_;
282: my $depth=0;
283: my $token;
284: my $result='';
285: my $tag=substr($tag,1); #strip the / off the tag
286: # &Apache::lonxml::debug("have:$tag:");
287: while (($depth >=0) && ($token = $pars->get_token)) {
288: if ($token->[0] eq 'T') {
289: $result.=$token->[1];
290: } elsif ($token->[0] eq 'S') {
291: if ($token->[1] eq $tag) { $depth++; }
292: $result.=$token->[4];
293: } elsif ($token->[0] eq 'E') {
294: if ( $token->[1] eq $tag) { $depth--; }
295: #skip sending back the last end tag
296: if ($depth > -1) { $result.=$token->[2]; } else {
297: $pars->unget_token($token);
298: }
299: }
300: }
301: return $result
302: }
303:
304: sub newparser {
305: my ($parser,$contentref,$dir) = @_;
306: push (@$parser,HTML::TokeParser->new($contentref));
307: if ( $dir eq '' ) {
308: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
309: } else {
310: push (@Apache::lonxml::pwd, $dir);
311: }
312: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
313: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
314: }
315:
316: sub parstring {
317: my ($token) = @_;
318: my $temp='';
319: map {
320: unless ($_=~/\W/) {
321: my $val=$token->[2]->{$_};
322: if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
323: $temp .= "my \$$_=\"$val\";"
324: }
325: } @{$token->[3]};
326: return $temp;
327: }
328:
329: sub writeallows {
330: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
331: my $thisdir=$thisurl;
332: $thisdir=~s/\/[^\/]+$//;
333: my %httpref=();
334: map {
335: $httpref{'httpref.'.
336: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
337: &Apache::lonnet::appenv(%httpref);
338: }
339:
340: sub handler {
341: my $request=shift;
342:
343: my $target='web';
344: # $Apache::lonxml::debug=1;
345: if ($ENV{'browser.mathml'}) {
346: $request->content_type('text/xml');
347: } else {
348: $request->content_type('text/html');
349: }
350:
351: # $request->print(<<ENDHEADER);
352: #<html>
353: #<head>
354: #<title>Just test</title>
355: #</head>
356: #<body bgcolor="#FFFFFF">
357: #ENDHEADER
358: # &Apache::lonhomework::send_header($request);
359: $request->send_http_header;
360:
361: return 'OK' if $request->header_only;
362:
363: $request->print(&Apache::lontexconvert::header());
364:
365: $request->print('<body bgcolor="#FFFFFF">'."\n");
366:
367: my $file = "/home/httpd/html".$request->uri;
368: my %mystyle;
369: my $result = '';
370: $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
371: $request->print($result);
372:
373: $request->print('</body>');
374: $request->print(&Apache::lontexconvert::footer());
375: writeallows($request->uri);
376: return 'OK';
377: }
378:
379: $Apache::lonxml::debug=0;
380: sub debug {
381: if ($Apache::lonxml::debug eq 1) {
382: print "DEBUG:".$_[0]."<br>\n";
383: }
384: }
385: sub error {
386: # print "ERROR:".$_[0]."<br>\n";
387: }
388: sub warning {
389: if ($Apache::lonxml::debug eq 1) {
390: print "WARNING:".$_[0]."<br>\n";
391: }
392: }
393:
394: 1;
395: __END__
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