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