Annotation of loncom/xml/lonxml.pm, revision 1.38
1.2 sakharuk 1: # The LearningOnline Network with CAPA
1.3 sakharuk 2: # XML Parser Module
1.2 sakharuk 3: #
1.3 sakharuk 4: # last modified 06/26/00 by Alexander Sakharuk
1.33 www 5: # 11/6 Gerd Kortemeyer
1.2 sakharuk 6:
1.4 albertel 7: package Apache::lonxml;
1.33 www 8: use vars
9: qw(@pwd $outputstack $redirection $textredirection $on_offimport @extlinks);
1.1 sakharuk 10: use strict;
11: use HTML::TokeParser;
1.3 sakharuk 12: use Safe;
1.13 albertel 13: use Opcode;
1.7 albertel 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: }
1.11 sakharuk 24:
1.4 albertel 25: use Apache::style;
1.3 sakharuk 26: use Apache::lontexconvert;
1.7 albertel 27: use Apache::run;
1.4 albertel 28: use Apache::londefdef;
1.7 albertel 29: use Apache::scripttag;
1.3 sakharuk 30: #================================================== Main subroutine: xmlparse
1.33 www 31: @pwd=();
32: $outputstack = '';
33: $redirection = 1;
34: $textredirection = 1;
35: $on_offimport = 0;
36: @extlinks=();
1.31 sakharuk 37:
1.3 sakharuk 38: sub xmlparse {
39:
1.18 albertel 40: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.32 sakharuk 41: if ($target eq 'meta')
42: {$Apache::lonxml::textredirection = 0;
43: $Apache::lonxml::on_offimport = 1;
44: }
1.16 albertel 45: my @pars = ();
1.23 albertel 46: @Apache::lonxml::pwd=();
47: my $pwd=$ENV{'request.filename'};
48: $pwd =~ s:/[^/]*$::;
49: &newparser(\@pars,\$content_file_string,$pwd);
1.3 sakharuk 50: my $currentstring = '';
51: my $finaloutput = '';
52: my $newarg = '';
1.16 albertel 53: my $result;
1.24 sakharuk 54:
1.3 sakharuk 55: my $safeeval = new Safe;
1.6 albertel 56: $safeeval->permit("entereval");
1.13 albertel 57: $safeeval->permit(":base_math");
1.19 albertel 58: $safeeval->deny(":base_io");
59: #need to inspect this class of ops
60: # $safeeval->deny(":base_orig");
1.21 albertel 61: $safeinit .= ';$external::target='.$target.';';
1.26 albertel 62: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
1.38 ! albertel 63: $safeinit .= &Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_xml.lcpm');
1.21 albertel 64: &Apache::run::run($safeinit,$safeeval);
1.3 sakharuk 65: #-------------------- Redefinition of the target in the case of compound target
66:
67: ($target, my @tenta) = split('&&',$target);
68:
69: my @stack = ();
70: my @parstack = ();
1.17 albertel 71: &initdepth;
1.3 sakharuk 72: my $token;
1.16 albertel 73: while ( $#pars > -1 ) {
74: while ($token = $pars[$#pars]->get_token) {
75: if ($token->[0] eq 'T') {
1.30 sakharuk 76: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
1.16 albertel 77: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
78: } elsif ($token->[0] eq 'S') {
1.31 sakharuk 79: # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
1.16 albertel 80: # add tag to stack
81: push (@stack,$token->[1]);
82: # add parameters list to another stack
83: push (@parstack,&parstring($token));
1.19 albertel 84: &increasedepth($token);
1.16 albertel 85: if (exists $style_for_target{$token->[1]}) {
1.24 sakharuk 86:
1.25 sakharuk 87: if ($Apache::lonxml::redirection == 1) {
1.24 sakharuk 88: $finaloutput .= &recurse($style_for_target{$token->[1]},
89: $target,$safeeval,\%style_for_target,
90: @parstack);
91: } else {
1.25 sakharuk 92: $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
1.24 sakharuk 93: $target,$safeeval,\%style_for_target,
94: @parstack);
95: }
96:
1.16 albertel 97: } else {
1.17 albertel 98: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.16 albertel 99: \@pars, $safeeval, \%style_for_target);
100: }
101: } elsif ($token->[0] eq 'E') {
1.31 sakharuk 102: # if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
1.16 albertel 103: #clear out any tags that didn't end
104: while ($token->[1] ne $stack[$#stack]
1.37 albertel 105: && ($#stack > -1)) {pop @stack;pop @parstack;&decreasedepth($token);}
1.16 albertel 106:
107: if (exists $style_for_target{'/'."$token->[1]"}) {
1.24 sakharuk 108:
1.25 sakharuk 109: if ($Apache::lonxml::redirection == 1) {
1.16 albertel 110: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
111: $target,$safeeval,\%style_for_target,
112: @parstack);
1.24 sakharuk 113: } else {
1.25 sakharuk 114: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
1.24 sakharuk 115: $target,$safeeval,\%style_for_target,
116: @parstack);
117: }
118:
1.16 albertel 119: } else {
1.17 albertel 120: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.16 albertel 121: \@pars,$safeeval, \%style_for_target);
1.13 albertel 122: }
1.16 albertel 123: }
1.25 sakharuk 124: if ($result ne "") {
1.24 sakharuk 125: if ( $#parstack > -1 ) {
126:
1.25 sakharuk 127: if ($Apache::lonxml::redirection == 1) {
1.13 albertel 128: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
129: $parstack[$#parstack]);
1.24 sakharuk 130: } else {
1.25 sakharuk 131: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
1.24 sakharuk 132: $parstack[$#parstack]);
133: }
134:
1.16 albertel 135: } else {
136: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 137: }
1.16 albertel 138: $result = '';
1.25 sakharuk 139: } else {
140: $finaloutput .= $result;
1.2 sakharuk 141: }
1.19 albertel 142: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
1.5 albertel 143: }
1.16 albertel 144: pop @pars;
1.23 albertel 145: pop @Apache::lonxml::pwd;
1.3 sakharuk 146: }
1.24 sakharuk 147:
1.3 sakharuk 148: return $finaloutput;
1.15 albertel 149: }
150:
151: sub recurse {
152:
153: my @innerstack = ();
154: my @innerparstack = ();
155: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 156: my @pat = ();
1.23 albertel 157: &newparser(\@pat,\$newarg);
1.15 albertel 158: my $tokenpat;
159: my $partstring = '';
160: my $output='';
1.16 albertel 161: my $decls='';
162: while ( $#pat > -1 ) {
163: while ($tokenpat = $pat[$#pat]->get_token) {
164: if ($tokenpat->[0] eq 'T') {
1.30 sakharuk 165: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
1.16 albertel 166: } elsif ($tokenpat->[0] eq 'S') {
167: push (@innerstack,$tokenpat->[1]);
168: push (@innerparstack,&parstring($tokenpat));
1.19 albertel 169: &increasedepth($tokenpat);
1.16 albertel 170: $partstring = &callsub("start_$tokenpat->[1]",
171: $target, $tokenpat, \@innerparstack,
172: \@pat, $safeeval, $style_for_target);
173: } elsif ($tokenpat->[0] eq 'E') {
174: #clear out any tags that didn't end
175: while ($tokenpat->[1] ne $innerstack[$#innerstack]
1.17 albertel 176: && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;
1.19 albertel 177: &decreasedepth($tokenpat);}
1.16 albertel 178: $partstring = &callsub("end_$tokenpat->[1]",
179: $target, $tokenpat, \@innerparstack,
180: \@pat, $safeeval, $style_for_target);
181: }
182: #pass both the variable to the style tag, and the tag we
183: #are processing inside the <definedtag>
184: if ( $partstring ne "" ) {
185: if ( $#parstack > -1 ) {
186: if ( $#innerparstack > -1 ) {
187: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
188: } else {
189: $decls= $parstack[$#parstack];
190: }
191: } else {
192: if ( $#innerparstack > -1 ) {
193: $decls=$innerparstack[$#innerparstack];
194: } else {
195: $decls='';
196: }
197: }
198: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
199: $partstring = '';
200: }
1.17 albertel 201: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19 albertel 202: &decreasedepth($tokenpat);}
1.15 albertel 203: }
1.16 albertel 204: pop @pat;
1.23 albertel 205: pop @Apache::lonxml::pwd;
1.15 albertel 206: }
207: return $output;
1.7 albertel 208: }
209:
210: sub callsub {
1.14 albertel 211: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 212: my $currentstring='';
213: {
1.24 sakharuk 214: my $sub1;
1.7 albertel 215: no strict 'refs';
216: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.26 albertel 217: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
1.24 sakharuk 218: $sub1="$space\:\:$sub";
1.17 albertel 219: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.24 sakharuk 220: $currentstring = &$sub1($target,$token,$parstack,$parser,
1.16 albertel 221: $safeeval,$style);
1.7 albertel 222: } else {
1.23 albertel 223: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
1.7 albertel 224: if (defined($token->[4])) {
225: $currentstring = $token->[4];
226: } else {
227: $currentstring = $token->[2];
228: }
229: }
230: use strict 'refs';
231: }
232: return $currentstring;
1.17 albertel 233: }
234:
235: sub initdepth {
236: @Apache::lonxml::depthcounter=();
237: $Apache::lonxml::depth=-1;
238: $Apache::lonxml::olddepth=-1;
239: }
240:
241: sub increasedepth {
1.19 albertel 242: my ($token) = @_;
1.17 albertel 243: $Apache::lonxml::depth++;
244: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
245: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
246: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
247: }
1.36 albertel 248: # my $curdepth=join('_',@Apache::lonxml::depthcounter);
249: # print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]<br>\n";
1.17 albertel 250: }
251:
252: sub decreasedepth {
1.19 albertel 253: my ($token) = @_;
1.17 albertel 254: $Apache::lonxml::depth--;
1.36 albertel 255: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
256: $#Apache::lonxml::depthcounter--;
257: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
258: }
259: # my $curdepth=join('_',@Apache::lonxml::depthcounter);
260: # print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth <br>\n";
1.1 sakharuk 261: }
1.19 albertel 262:
263: sub get_all_text {
264:
265: my($tag,$pars)= @_;
266: my $depth=0;
267: my $token;
268: my $result='';
1.24 sakharuk 269: my $tag=substr($tag,1); #strip the / off the tag
270: # &Apache::lonxml::debug("have:$tag:");
1.19 albertel 271: while (($depth >=0) && ($token = $pars->get_token)) {
272: if ($token->[0] eq 'T') {
273: $result.=$token->[1];
274: } elsif ($token->[0] eq 'S') {
275: if ($token->[1] eq $tag) { $depth++; }
276: $result.=$token->[4];
277: } elsif ($token->[0] eq 'E') {
1.24 sakharuk 278: if ( $token->[1] eq $tag) { $depth--; }
1.19 albertel 279: #skip sending back the last end tag
1.36 albertel 280: if ($depth > -1) { $result.=$token->[2]; } else {
281: $pars->unget_token($token);
282: }
1.19 albertel 283: }
284: }
285: return $result
286: }
287:
1.23 albertel 288: sub newparser {
289: my ($parser,$contentref,$dir) = @_;
290: push (@$parser,HTML::TokeParser->new($contentref));
291: if ( $dir eq '' ) {
292: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
293: } else {
294: push (@Apache::lonxml::pwd, $dir);
295: }
296: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
297: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
298: }
1.1 sakharuk 299:
1.8 albertel 300: sub parstring {
301: my ($token) = @_;
302: my $temp='';
1.20 albertel 303: map {
1.35 www 304: unless ($_=~/\W/) {
1.20 albertel 305: $temp .= "my \$$_=\"$token->[2]->{$_}\";"
306: }
307: } @{$token->[3]};
1.8 albertel 308: return $temp;
309: }
1.22 albertel 310:
1.34 www 311: sub writeallows {
312: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
313: my $thisdir=$thisurl;
314: $thisdir=~s/\/[^\/]+$//;
315: my %httpref=();
316: map {
317: $httpref{'httpref.'.
318: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
319: &Apache::lonnet::appenv(%httpref);
320: }
321:
1.24 sakharuk 322: sub handler {
323: my $request=shift;
324:
1.31 sakharuk 325: my $target='web';
1.24 sakharuk 326: $Apache::lonxml::debug=1;
1.25 sakharuk 327: if ($ENV{'browser.mathml'}) {
1.27 albertel 328: $request->content_type('text/xml');
329: } else {
330: $request->content_type('text/html');
1.25 sakharuk 331: }
1.29 sakharuk 332:
333: # $request->print(<<ENDHEADER);
334: #<html>
335: #<head>
336: #<title>Just test</title>
337: #</head>
338: #<body bgcolor="#FFFFFF">
339: #ENDHEADER
340: # &Apache::lonhomework::send_header($request);
1.27 albertel 341: $request->send_http_header;
342:
1.28 albertel 343: return 'OK' if $request->header_only;
1.27 albertel 344:
345: $request->print(&Apache::lontexconvert::header());
346:
1.28 albertel 347: $request->print('<body bgcolor="#FFFFFF">'."\n");
1.27 albertel 348:
1.24 sakharuk 349: my $file = "/home/httpd/html".$request->uri;
350: my %mystyle;
351: my $result = '';
352: $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
353: $request->print($result);
1.29 sakharuk 354:
1.28 albertel 355: $request->print('</body>');
356: $request->print(&Apache::lontexconvert::footer());
1.34 www 357: writeallows($request->uri);
1.28 albertel 358: return 'OK';
1.24 sakharuk 359: }
360:
1.22 albertel 361: $Apache::lonxml::debug=0;
362: sub debug {
363: if ($Apache::lonxml::debug eq 1) {
364: print "DEBUG:".$_[0]."<br>\n";
365: }
366: }
367: sub error {
1.23 albertel 368: print "ERROR:".$_[0]."<br>\n";
1.22 albertel 369: }
370: sub warning {
371: if ($Apache::lonxml::debug eq 1) {
372: print "WARNING:".$_[0]."<br>\n";
373: }
374: }
375:
1.1 sakharuk 376: 1;
377: __END__
1.25 sakharuk 378:
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1.11 sakharuk 391:
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