1: # The LearningOnline Network with CAPA
2: # XML Parser Module
3: #
4: # last modified 06/26/00 by Alexander Sakharuk
5:
6: package Apache::lonxml;
7:
8: use strict;
9: use HTML::TokeParser;
10: use Safe;
11: use Opcode;
12:
13: sub register {
14: my $space;
15: my @taglist;
16: my $temptag;
17: ($space,@taglist) = @_;
18: foreach $temptag (@taglist) {
19: $Apache::lonxml::alltags{$temptag}=$space;
20: }
21: }
22:
23: use Apache::style;
24: use Apache::lontexconvert;
25: use Apache::run;
26: use Apache::londefdef;
27: use Apache::scripttag;
28: #================================================== Main subroutine: xmlparse
29: @Apache::lonxml::pwd=();
30: $Apache::lonxml::outputstack = '';
31: $Apache::lonxml::redirection = 1;
32: $Apache::lonxml::textredirection = 1;
33:
34:
35: sub xmlparse {
36:
37: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
38: if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
39: my @pars = ();
40: @Apache::lonxml::pwd=();
41: my $pwd=$ENV{'request.filename'};
42: $pwd =~ s:/[^/]*$::;
43: &newparser(\@pars,\$content_file_string,$pwd);
44: my $currentstring = '';
45: my $finaloutput = '';
46: my $newarg = '';
47: my $result;
48:
49: my $safeeval = new Safe;
50: $safeeval->permit("entereval");
51: $safeeval->permit(":base_math");
52: $safeeval->deny(":base_io");
53: #need to inspect this class of ops
54: # $safeeval->deny(":base_orig");
55: $safeinit .= ';$external::target='.$target.';';
56: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
57: &Apache::run::run($safeinit,$safeeval);
58: #-------------------- Redefinition of the target in the case of compound target
59:
60: ($target, my @tenta) = split('&&',$target);
61:
62: my @stack = ();
63: my @parstack = ();
64: &initdepth;
65: my $token;
66: while ( $#pars > -1 ) {
67: while ($token = $pars[$#pars]->get_token) {
68: if ($token->[0] eq 'T') {
69: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
70: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
71: } elsif ($token->[0] eq 'S') {
72: # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
73: # add tag to stack
74: push (@stack,$token->[1]);
75: # add parameters list to another stack
76: push (@parstack,&parstring($token));
77: &increasedepth($token);
78: if (exists $style_for_target{$token->[1]}) {
79:
80: if ($Apache::lonxml::redirection == 1) {
81: $finaloutput .= &recurse($style_for_target{$token->[1]},
82: $target,$safeeval,\%style_for_target,
83: @parstack);
84: } else {
85: $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
86: $target,$safeeval,\%style_for_target,
87: @parstack);
88: }
89:
90: } else {
91: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
92: \@pars, $safeeval, \%style_for_target);
93: }
94: } elsif ($token->[0] eq 'E') {
95: # if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
96: #clear out any tags that didn't end
97: while ($token->[1] ne $stack[$#stack]
98: && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
99:
100: if (exists $style_for_target{'/'."$token->[1]"}) {
101:
102: if ($Apache::lonxml::redirection == 1) {
103: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
104: $target,$safeeval,\%style_for_target,
105: @parstack);
106: } else {
107: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
108: $target,$safeeval,\%style_for_target,
109: @parstack);
110: }
111:
112: } else {
113: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
114: \@pars,$safeeval, \%style_for_target);
115: }
116: }
117: if ($result ne "") {
118: if ( $#parstack > -1 ) {
119:
120: if ($Apache::lonxml::redirection == 1) {
121: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
122: $parstack[$#parstack]);
123: } else {
124: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
125: $parstack[$#parstack]);
126: }
127:
128: } else {
129: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
130: }
131: $result = '';
132: } else {
133: $finaloutput .= $result;
134: }
135: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
136: }
137: pop @pars;
138: pop @Apache::lonxml::pwd;
139: }
140:
141: return $finaloutput;
142: }
143:
144: sub recurse {
145:
146: my @innerstack = ();
147: my @innerparstack = ();
148: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
149: my @pat = ();
150: &newparser(\@pat,\$newarg);
151: my $tokenpat;
152: my $partstring = '';
153: my $output='';
154: my $decls='';
155: while ( $#pat > -1 ) {
156: while ($tokenpat = $pat[$#pat]->get_token) {
157: if ($tokenpat->[0] eq 'T') {
158: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
159: } elsif ($tokenpat->[0] eq 'S') {
160: push (@innerstack,$tokenpat->[1]);
161: push (@innerparstack,&parstring($tokenpat));
162: &increasedepth($tokenpat);
163: $partstring = &callsub("start_$tokenpat->[1]",
164: $target, $tokenpat, \@innerparstack,
165: \@pat, $safeeval, $style_for_target);
166: } elsif ($tokenpat->[0] eq 'E') {
167: #clear out any tags that didn't end
168: while ($tokenpat->[1] ne $innerstack[$#innerstack]
169: && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
170: &decreasedepth($tokenpat);}
171: $partstring = &callsub("end_$tokenpat->[1]",
172: $target, $tokenpat, \@innerparstack,
173: \@pat, $safeeval, $style_for_target);
174: }
175: #pass both the variable to the style tag, and the tag we
176: #are processing inside the <definedtag>
177: if ( $partstring ne "" ) {
178: if ( $#parstack > -1 ) {
179: if ( $#innerparstack > -1 ) {
180: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
181: } else {
182: $decls= $parstack[$#parstack];
183: }
184: } else {
185: if ( $#innerparstack > -1 ) {
186: $decls=$innerparstack[$#innerparstack];
187: } else {
188: $decls='';
189: }
190: }
191: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
192: $partstring = '';
193: }
194: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
195: &decreasedepth($tokenpat);}
196: }
197: pop @pat;
198: pop @Apache::lonxml::pwd;
199: }
200: return $output;
201: }
202:
203: sub callsub {
204: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
205: my $currentstring='';
206: {
207: my $sub1;
208: no strict 'refs';
209: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
210: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
211: $sub1="$space\:\:$sub";
212: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
213: $currentstring = &$sub1($target,$token,$parstack,$parser,
214: $safeeval,$style);
215: } else {
216: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
217: if (defined($token->[4])) {
218: $currentstring = $token->[4];
219: } else {
220: $currentstring = $token->[2];
221: }
222: }
223: use strict 'refs';
224: }
225: return $currentstring;
226: }
227:
228: sub initdepth {
229: @Apache::lonxml::depthcounter=();
230: $Apache::lonxml::depth=-1;
231: $Apache::lonxml::olddepth=-1;
232: }
233:
234: sub increasedepth {
235: my ($token) = @_;
236: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
237: $#Apache::lonxml::depthcounter--;
238: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
239: }
240: $Apache::lonxml::depth++;
241: # print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
242: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
243: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
244: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
245: }
246: }
247:
248: sub decreasedepth {
249: my ($token) = @_;
250: $Apache::lonxml::depth--;
251: # print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
252: }
253:
254: sub get_all_text {
255:
256: my($tag,$pars)= @_;
257: my $depth=0;
258: my $token;
259: my $result='';
260: my $tag=substr($tag,1); #strip the / off the tag
261: # &Apache::lonxml::debug("have:$tag:");
262: while (($depth >=0) && ($token = $pars->get_token)) {
263: if ($token->[0] eq 'T') {
264: $result.=$token->[1];
265: } elsif ($token->[0] eq 'S') {
266: if ($token->[1] eq $tag) { $depth++; }
267: $result.=$token->[4];
268: } elsif ($token->[0] eq 'E') {
269: if ( $token->[1] eq $tag) { $depth--; }
270: #skip sending back the last end tag
271: if ($depth > -1) { $result.=$token->[2]; }
272: }
273: }
274: return $result
275: }
276:
277: sub newparser {
278: my ($parser,$contentref,$dir) = @_;
279: push (@$parser,HTML::TokeParser->new($contentref));
280: if ( $dir eq '' ) {
281: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
282: } else {
283: push (@Apache::lonxml::pwd, $dir);
284: }
285: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
286: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
287: }
288:
289: sub parstring {
290: my ($token) = @_;
291: my $temp='';
292: map {
293: if ($_=~/\w+/) {
294: $temp .= "my \$$_=\"$token->[2]->{$_}\";"
295: }
296: } @{$token->[3]};
297: return $temp;
298: }
299:
300: sub handler {
301: my $request=shift;
302:
303: my $target='web';
304: $Apache::lonxml::debug=1;
305: if ($ENV{'browser.mathml'}) {
306: $request->content_type('text/xml');
307: } else {
308: $request->content_type('text/html');
309: }
310:
311: # $request->print(<<ENDHEADER);
312: #<html>
313: #<head>
314: #<title>Just test</title>
315: #</head>
316: #<body bgcolor="#FFFFFF">
317: #ENDHEADER
318: # &Apache::lonhomework::send_header($request);
319: $request->send_http_header;
320:
321: return 'OK' if $request->header_only;
322:
323: $request->print(&Apache::lontexconvert::header());
324:
325: $request->print('<body bgcolor="#FFFFFF">'."\n");
326:
327: my $file = "/home/httpd/html".$request->uri;
328: my %mystyle;
329: my $result = '';
330: $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
331: $request->print($result);
332:
333: $request->print('</body>');
334: $request->print(&Apache::lontexconvert::footer());
335: return 'OK';
336: }
337:
338: $Apache::lonxml::debug=0;
339: sub debug {
340: if ($Apache::lonxml::debug eq 1) {
341: print "DEBUG:".$_[0]."<br>\n";
342: }
343: }
344: sub error {
345: print "ERROR:".$_[0]."<br>\n";
346: }
347: sub warning {
348: if ($Apache::lonxml::debug eq 1) {
349: print "WARNING:".$_[0]."<br>\n";
350: }
351: }
352:
353: 1;
354: __END__
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