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:
8: package Apache::lonxml;
9: use vars
10: qw(@pwd $outputstack $redirection $textredirection $on_offimport @extlinks);
11: use strict;
12: use HTML::TokeParser;
13: use Safe;
14: use Safe::Hole;
15: use Opcode;
16: use Apache::Constants qw(:common);
17:
18: sub register {
19: my $space;
20: my @taglist;
21: my $temptag;
22: ($space,@taglist) = @_;
23: foreach $temptag (@taglist) {
24: $Apache::lonxml::alltags{$temptag}=$space;
25: }
26: }
27:
28: use Apache::style;
29: use Apache::lontexconvert;
30: use Apache::run;
31: use Apache::londefdef;
32: use Apache::scripttag;
33: #================================================== Main subroutine: xmlparse
34: @pwd=();
35: $outputstack = '';
36: $redirection = 1;
37: $textredirection = 1;
38: $on_offimport = 0;
39: @extlinks=();
40:
41: sub xmlparse {
42:
43: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
44: if ($target eq 'meta') {
45: $Apache::lonxml::textredirection = 0;
46: $Apache::lonxml::on_offimport = 1;
47: } else {
48: $Apache::lonxml::textredirection = 1;
49: $Apache::lonxml::on_offimport = 0;
50: }
51: my @pars = ();
52: @Apache::lonxml::pwd=();
53: my $pwd=$ENV{'request.filename'};
54: $pwd =~ s:/[^/]*$::;
55: &newparser(\@pars,\$content_file_string,$pwd);
56: my $currentstring = '';
57: my $finaloutput = '';
58: my $newarg = '';
59: my $result;
60:
61: my $safeeval = new Safe;
62: my $safehole = new Safe::Hole;
63: $safeeval->permit("entereval");
64: $safeeval->permit(":base_math");
65: $safeeval->deny(":base_io");
66: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
67: #need to inspect this class of ops
68: # $safeeval->deny(":base_orig");
69: $safeinit .= ';$external::target='.$target.';';
70: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
71: &Apache::run::run($safeinit,$safeeval);
72: #-------------------- Redefinition of the target in the case of compound target
73:
74: ($target, my @tenta) = split('&&',$target);
75:
76: my @stack = ();
77: my @parstack = ();
78: &initdepth;
79: my $token;
80: while ( $#pars > -1 ) {
81: while ($token = $pars[$#pars]->get_token) {
82: if ($token->[0] eq 'T') {
83: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
84: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
85: } elsif ($token->[0] eq 'S') {
86: # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
87: # add tag to stack
88: push (@stack,$token->[1]);
89: # add parameters list to another stack
90: push (@parstack,&parstring($token));
91: &increasedepth($token);
92: if (exists $style_for_target{$token->[1]}) {
93:
94: if ($Apache::lonxml::redirection == 1) {
95: $finaloutput .= &recurse($style_for_target{$token->[1]},
96: $target,$safeeval,\%style_for_target,
97: @parstack);
98: } else {
99: $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
100: $target,$safeeval,\%style_for_target,
101: @parstack);
102: }
103:
104: } else {
105: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
106: \@pars, $safeeval, \%style_for_target);
107: }
108: } elsif ($token->[0] eq 'E') {
109: #if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
110: #clear out any tags that didn't end
111: while ($token->[1] ne $stack[$#stack]
112: && ($#stack > -1)) {
113: &Apache::lonxml::error("Unbalanced tags in resource $stack['-1']");
114: pop @stack;pop @parstack;&decreasedepth($token);
115: }
116:
117: if (exists $style_for_target{'/'."$token->[1]"}) {
118:
119: if ($Apache::lonxml::redirection == 1) {
120: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
121: $target,$safeeval,\%style_for_target,
122: @parstack);
123: } else {
124: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
125: $target,$safeeval,\%style_for_target,
126: @parstack);
127: }
128:
129: } else {
130: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
131: \@pars,$safeeval, \%style_for_target);
132: }
133: }
134: if ($result ne "") {
135: if ( $#parstack > -1 ) {
136:
137: if ($Apache::lonxml::redirection == 1) {
138: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
139: $parstack[$#parstack]);
140: } else {
141: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
142: $parstack[$#parstack]);
143: }
144:
145: } else {
146: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
147: }
148: $result = '';
149: } else {
150: $finaloutput .= $result;
151: }
152: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
153: }
154: pop @pars;
155: pop @Apache::lonxml::pwd;
156: }
157:
158: return $finaloutput;
159: }
160:
161: sub recurse {
162:
163: my @innerstack = ();
164: my @innerparstack = ();
165: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
166: my @pat = ();
167: &newparser(\@pat,\$newarg);
168: my $tokenpat;
169: my $partstring = '';
170: my $output='';
171: my $decls='';
172: while ( $#pat > -1 ) {
173: while ($tokenpat = $pat[$#pat]->get_token) {
174: if ($tokenpat->[0] eq 'T') {
175: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
176: } elsif ($tokenpat->[0] eq 'S') {
177: push (@innerstack,$tokenpat->[1]);
178: push (@innerparstack,&parstring($tokenpat));
179: &increasedepth($tokenpat);
180: $partstring = &callsub("start_$tokenpat->[1]",
181: $target, $tokenpat, \@innerparstack,
182: \@pat, $safeeval, $style_for_target);
183: } elsif ($tokenpat->[0] eq 'E') {
184: #clear out any tags that didn't end
185: while ($tokenpat->[1] ne $innerstack[$#innerstack]
186: && ($#innerstack > -1)) {
187: &Apache::lonxml::error("Unbalanced tags in resource $innerstack['-1']");
188: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
189: }
190: $partstring = &callsub("end_$tokenpat->[1]",
191: $target, $tokenpat, \@innerparstack,
192: \@pat, $safeeval, $style_for_target);
193: }
194: #pass both the variable to the style tag, and the tag we
195: #are processing inside the <definedtag>
196: if ( $partstring ne "" ) {
197: if ( $#parstack > -1 ) {
198: if ( $#innerparstack > -1 ) {
199: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
200: } else {
201: $decls= $parstack[$#parstack];
202: }
203: } else {
204: if ( $#innerparstack > -1 ) {
205: $decls=$innerparstack[$#innerparstack];
206: } else {
207: $decls='';
208: }
209: }
210: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
211: $partstring = '';
212: }
213: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
214: &decreasedepth($tokenpat);}
215: }
216: pop @pat;
217: pop @Apache::lonxml::pwd;
218: }
219: return $output;
220: }
221:
222: sub callsub {
223: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
224: my $currentstring='';
225: {
226: my $sub1;
227: no strict 'refs';
228: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
229: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
230: $sub1="$space\:\:$sub";
231: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
232: $currentstring = &$sub1($target,$token,$parstack,$parser,
233: $safeeval,$style);
234: } else {
235: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
236: if (defined($token->[4])) {
237: $currentstring = $token->[4];
238: } else {
239: $currentstring = $token->[2];
240: }
241: }
242: use strict 'refs';
243: }
244: return $currentstring;
245: }
246:
247: sub initdepth {
248: @Apache::lonxml::depthcounter=();
249: $Apache::lonxml::depth=-1;
250: $Apache::lonxml::olddepth=-1;
251: }
252:
253: sub increasedepth {
254: my ($token) = @_;
255: $Apache::lonxml::depth++;
256: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
257: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
258: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
259: }
260: my $curdepth=join('_',@Apache::lonxml::depthcounter);
261: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
262: #print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
263: }
264:
265: sub decreasedepth {
266: my ($token) = @_;
267: $Apache::lonxml::depth--;
268: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
269: $#Apache::lonxml::depthcounter--;
270: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
271: }
272: if ( $Apache::lonxml::depth < -1) {
273: &Apache::lonxml::error("Unbalanced tags in resource");
274: $Apache::lonxml::depth='-1';
275: }
276: my $curdepth=join('_',@Apache::lonxml::depthcounter);
277: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
278: #print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
279: }
280:
281: sub get_all_text {
282:
283: my($tag,$pars)= @_;
284: my $depth=0;
285: my $token;
286: my $result='';
287: my $tag=substr($tag,1); #strip the / off the tag
288: # &Apache::lonxml::debug("have:$tag:");
289: while (($depth >=0) && ($token = $pars->get_token)) {
290: if ($token->[0] eq 'T') {
291: $result.=$token->[1];
292: } elsif ($token->[0] eq 'S') {
293: if ($token->[1] eq $tag) { $depth++; }
294: $result.=$token->[4];
295: } elsif ($token->[0] eq 'E') {
296: if ( $token->[1] eq $tag) { $depth--; }
297: #skip sending back the last end tag
298: if ($depth > -1) { $result.=$token->[2]; } else {
299: $pars->unget_token($token);
300: }
301: }
302: }
303: return $result
304: }
305:
306: sub newparser {
307: my ($parser,$contentref,$dir) = @_;
308: push (@$parser,HTML::TokeParser->new($contentref));
309: if ( $dir eq '' ) {
310: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
311: } else {
312: push (@Apache::lonxml::pwd, $dir);
313: }
314: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
315: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
316: }
317:
318: sub parstring {
319: my ($token) = @_;
320: my $temp='';
321: map {
322: unless ($_=~/\W/) {
323: my $val=$token->[2]->{$_};
324: if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
325: $temp .= "my \$$_=\"$val\";"
326: }
327: } @{$token->[3]};
328: return $temp;
329: }
330:
331: sub writeallows {
332: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
333: my $thisdir=$thisurl;
334: $thisdir=~s/\/[^\/]+$//;
335: my %httpref=();
336: map {
337: $httpref{'httpref.'.
338: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
339: &Apache::lonnet::appenv(%httpref);
340: }
341:
342: sub handler {
343: my $request=shift;
344:
345: my $target='web';
346: # $Apache::lonxml::debug=1;
347: if ($ENV{'browser.mathml'}) {
348: $request->content_type('text/xml');
349: } else {
350: $request->content_type('text/html');
351: }
352:
353: # $request->print(<<ENDHEADER);
354: #<html>
355: #<head>
356: #<title>Just test</title>
357: #</head>
358: #<body bgcolor="#FFFFFF">
359: #ENDHEADER
360: # &Apache::lonhomework::send_header($request);
361: $request->send_http_header;
362:
363: return OK if $request->header_only;
364:
365: $request->print(&Apache::lontexconvert::header());
366:
367: $request->print('<body bgcolor="#FFFFFF">'."\n");
368:
369: my $file = "/home/httpd/html".$request->uri;
370: my %mystyle;
371: my $result = '';
372: $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
373: $request->print($result);
374:
375: $request->print('</body>');
376: $request->print(&Apache::lontexconvert::footer());
377: writeallows($request->uri);
378: return OK;
379: }
380:
381: $Apache::lonxml::debug=0;
382: sub debug {
383: if ($Apache::lonxml::debug eq 1) {
384: print "DEBUG:".$_[0]."<br>\n";
385: }
386: }
387: sub error {
388: # print "ERROR:".$_[0]."<br>\n";
389: }
390: sub warning {
391: if ($Apache::lonxml::debug eq 1) {
392: print "WARNING:".$_[0]."<br>\n";
393: }
394: }
395:
396: 1;
397: __END__
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