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}=$space;
20: }
21: }
22:
23: use Apache::style;
24: use Apache::lontexconvert;
25: use Apache::run;
26: use Apache::londefdef;
27: use Apache::scripttag;
28: #================================================== Main subroutine: xmlparse
29: @Apache::lonxml::pwd=();
30: sub xmlparse {
31:
32: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
33: my @pars = ();
34: @Apache::lonxml::pwd=();
35: my $pwd=$ENV{'request.filename'};
36: $pwd =~ s:/[^/]*$::;
37: &newparser(\@pars,\$content_file_string,$pwd);
38: my $currentstring = '';
39: my $finaloutput = '';
40: my $newarg = '';
41: my $result;
42:
43: my $indicator = 1;
44: my $pocketbox = '';
45:
46: my $safeeval = new Safe;
47: $safeeval->permit("entereval");
48: $safeeval->permit(":base_math");
49: $safeeval->deny(":base_io");
50: #need to inspect this class of ops
51: # $safeeval->deny(":base_orig");
52: $safeinit .= ';$external::target='.$target.';';
53: &Apache::run::run($safeinit,$safeeval);
54: #-------------------- Redefinition of the target in the case of compound target
55:
56: ($target, my @tenta) = split('&&',$target);
57:
58: my @stack = ();
59: my @parstack = ();
60: &initdepth;
61: my $token;
62: while ( $#pars > -1 ) {
63: while ($token = $pars[$#pars]->get_token) {
64: if ($token->[0] eq 'T') {
65: $result=$token->[1];
66: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
67: } elsif ($token->[0] eq 'S') {
68: # add tag to stack
69: push (@stack,$token->[1]);
70: # add parameters list to another stack
71: push (@parstack,&parstring($token));
72: &increasedepth($token);
73: if (exists $style_for_target{$token->[1]}) {
74:
75: if ($indicator == 1) {
76: $finaloutput .= &recurse($style_for_target{$token->[1]},
77: $target,$safeeval,\%style_for_target,
78: @parstack);
79: } else {
80: $pocketbox .= &recurse($style_for_target{$token->[1]},
81: $target,$safeeval,\%style_for_target,
82: @parstack);
83: }
84:
85: } else {
86: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
87: \@pars, $safeeval, \%style_for_target);
88:
89: if ($result eq "footnote") { &Apache::lonxml::debug($result);}
90:
91: }
92: } elsif ($token->[0] eq 'E') {
93: #clear out any tags that didn't end
94: while ($token->[1] ne $stack[$#stack]
95: && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
96:
97: if (exists $style_for_target{'/'."$token->[1]"}) {
98:
99: if ($indicator == 1) {
100: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
101: $target,$safeeval,\%style_for_target,
102: @parstack);
103: } else {
104: $pocketbox .= &recurse($style_for_target{'/'."$token->[1]"},
105: $target,$safeeval,\%style_for_target,
106: @parstack);
107: }
108:
109: } else {
110: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
111: \@pars,$safeeval, \%style_for_target);
112: }
113: }
114: if ($result ne "" ) {
115: if ( $#parstack > -1 ) {
116:
117: if ($indicator == 1) {
118: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
119: $parstack[$#parstack]);
120: } else {
121: $pocketbox .= &Apache::run::evaluate($result,$safeeval,
122: $parstack[$#parstack]);
123: }
124:
125: } else {
126: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
127: }
128: $result = '';
129: }
130: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
131: }
132: pop @pars;
133: pop @Apache::lonxml::pwd;
134: }
135:
136: return $finaloutput;
137: }
138:
139: sub recurse {
140:
141: my @innerstack = ();
142: my @innerparstack = ();
143: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
144: my @pat = ();
145: &newparser(\@pat,\$newarg);
146: my $tokenpat;
147: my $partstring = '';
148: my $output='';
149: my $decls='';
150: while ( $#pat > -1 ) {
151: while ($tokenpat = $pat[$#pat]->get_token) {
152: if ($tokenpat->[0] eq 'T') {
153: $partstring = $tokenpat->[1];
154: } elsif ($tokenpat->[0] eq 'S') {
155: push (@innerstack,$tokenpat->[1]);
156: push (@innerparstack,&parstring($tokenpat));
157: &increasedepth($tokenpat);
158: $partstring = &callsub("start_$tokenpat->[1]",
159: $target, $tokenpat, \@innerparstack,
160: \@pat, $safeeval, $style_for_target);
161: } elsif ($tokenpat->[0] eq 'E') {
162: #clear out any tags that didn't end
163: while ($tokenpat->[1] ne $innerstack[$#innerstack]
164: && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
165: &decreasedepth($tokenpat);}
166: $partstring = &callsub("end_$tokenpat->[1]",
167: $target, $tokenpat, \@innerparstack,
168: \@pat, $safeeval, $style_for_target);
169: }
170: #pass both the variable to the style tag, and the tag we
171: #are processing inside the <definedtag>
172: if ( $partstring ne "" ) {
173: if ( $#parstack > -1 ) {
174: if ( $#innerparstack > -1 ) {
175: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
176: } else {
177: $decls= $parstack[$#parstack];
178: }
179: } else {
180: if ( $#innerparstack > -1 ) {
181: $decls=$innerparstack[$#innerparstack];
182: } else {
183: $decls='';
184: }
185: }
186: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
187: $partstring = '';
188: }
189: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
190: &decreasedepth($tokenpat);}
191: }
192: pop @pat;
193: pop @Apache::lonxml::pwd;
194: }
195: return $output;
196: }
197:
198: sub callsub {
199: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
200: my $currentstring='';
201: {
202: my $sub1;
203: no strict 'refs';
204: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
205: # &Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
206: # if ( $sub eq "start_parserlib" ) {
207: # print "me:".%$style.":\n";
208: # }
209: $sub1="$space\:\:$sub";
210: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
211: $currentstring = &$sub1($target,$token,$parstack,$parser,
212: $safeeval,$style);
213: # if ( $sub eq "start_parserlib" ) {
214: # print "me2:".%$style.":";
215: # }
216: } else {
217: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
218: if (defined($token->[4])) {
219: $currentstring = $token->[4];
220: } else {
221: $currentstring = $token->[2];
222: }
223: }
224: use strict 'refs';
225: }
226: return $currentstring;
227: }
228:
229: sub initdepth {
230: @Apache::lonxml::depthcounter=();
231: $Apache::lonxml::depth=-1;
232: $Apache::lonxml::olddepth=-1;
233: }
234:
235: sub increasedepth {
236: my ($token) = @_;
237: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
238: $#Apache::lonxml::depthcounter--;
239: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
240: }
241: $Apache::lonxml::depth++;
242: # print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
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: }
248:
249: sub decreasedepth {
250: my ($token) = @_;
251: $Apache::lonxml::depth--;
252: # print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1]<br>\n";
253: }
254:
255: sub get_all_text {
256:
257: my($tag,$pars)= @_;
258: my $depth=0;
259: my $token;
260: my $result='';
261: my $tag=substr($tag,1); #strip the / off the tag
262: # &Apache::lonxml::debug("have:$tag:");
263: while (($depth >=0) && ($token = $pars->get_token)) {
264: if ($token->[0] eq 'T') {
265: $result.=$token->[1];
266: } elsif ($token->[0] eq 'S') {
267: if ($token->[1] eq $tag) { $depth++; }
268: $result.=$token->[4];
269: } elsif ($token->[0] eq 'E') {
270: if ( $token->[1] eq $tag) { $depth--; }
271: #skip sending back the last end tag
272: if ($depth > -1) { $result.=$token->[2]; }
273: }
274: }
275: return $result
276: }
277:
278: sub newparser {
279: my ($parser,$contentref,$dir) = @_;
280: push (@$parser,HTML::TokeParser->new($contentref));
281: if ( $dir eq '' ) {
282: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
283: } else {
284: push (@Apache::lonxml::pwd, $dir);
285: }
286: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
287: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
288: }
289:
290: sub parstring {
291: my ($token) = @_;
292: my $temp='';
293: map {
294: if ($_=~/\w+/) {
295: $temp .= "my \$$_=\"$token->[2]->{$_}\";"
296: }
297: } @{$token->[3]};
298: return $temp;
299: }
300: #<<<<<<< lonxml.pm
301:
302: sub handler {
303: my $request=shift;
304:
305: my $target='web';
306: $Apache::lonxml::debug=1;
307: $request->content_type('text/html');
308: $request->send_http_header;
309: $request->print(<<ENDHEADER);
310: <html>
311: <head>
312: <title>Just test</title>
313: </head>
314: <body bgcolor="#FFFFFF">
315: ENDHEADER
316: # &Apache::lonhomework::send_header($request);
317: my $file = "/home/httpd/html".$request->uri;
318: my %mystyle;
319: my $result = '';
320: $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
321: # $request->print("Result follows:");
322: $request->print($result);
323: # $request->print(":Result ends");
324: }
325:
326: $Apache::lonxml::debug=0;
327: sub debug {
328: if ($Apache::lonxml::debug eq 1) {
329: print "DEBUG:".$_[0]."<br>\n";
330: }
331: }
332: sub error {
333: print "ERROR:".$_[0]."<br>\n";
334: }
335: sub warning {
336: if ($Apache::lonxml::debug eq 1) {
337: print "WARNING:".$_[0]."<br>\n";
338: }
339: }
340:
341: 1;
342: __END__
343:
344:
345:
346:
347:
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