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