Annotation of loncom/xml/lonxml.pm, revision 1.46
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
1.45 www 6: # 6/1/1 Gerd Kortemeyer
1.2 sakharuk 7:
1.4 albertel 8: package Apache::lonxml;
1.33 www 9: use vars
10: qw(@pwd $outputstack $redirection $textredirection $on_offimport @extlinks);
1.1 sakharuk 11: use strict;
12: use HTML::TokeParser;
1.3 sakharuk 13: use Safe;
1.40 albertel 14: use Safe::Hole;
1.13 albertel 15: use Opcode;
1.46 ! www 16: use Apache::Constants qw(:common);
1.7 albertel 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: }
1.11 sakharuk 27:
1.4 albertel 28: use Apache::style;
1.3 sakharuk 29: use Apache::lontexconvert;
1.7 albertel 30: use Apache::run;
1.4 albertel 31: use Apache::londefdef;
1.7 albertel 32: use Apache::scripttag;
1.3 sakharuk 33: #================================================== Main subroutine: xmlparse
1.33 www 34: @pwd=();
35: $outputstack = '';
36: $redirection = 1;
37: $textredirection = 1;
38: $on_offimport = 0;
39: @extlinks=();
1.31 sakharuk 40:
1.3 sakharuk 41: sub xmlparse {
42:
1.18 albertel 43: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.41 albertel 44: if ($target eq 'meta') {
45: $Apache::lonxml::textredirection = 0;
46: $Apache::lonxml::on_offimport = 1;
1.44 albertel 47: } else {
48: $Apache::lonxml::textredirection = 1;
49: $Apache::lonxml::on_offimport = 0;
1.32 sakharuk 50: }
1.16 albertel 51: my @pars = ();
1.23 albertel 52: @Apache::lonxml::pwd=();
53: my $pwd=$ENV{'request.filename'};
54: $pwd =~ s:/[^/]*$::;
55: &newparser(\@pars,\$content_file_string,$pwd);
1.3 sakharuk 56: my $currentstring = '';
57: my $finaloutput = '';
58: my $newarg = '';
1.16 albertel 59: my $result;
1.24 sakharuk 60:
1.3 sakharuk 61: my $safeeval = new Safe;
1.40 albertel 62: my $safehole = new Safe::Hole;
1.6 albertel 63: $safeeval->permit("entereval");
1.13 albertel 64: $safeeval->permit(":base_math");
1.19 albertel 65: $safeeval->deny(":base_io");
1.40 albertel 66: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1.19 albertel 67: #need to inspect this class of ops
68: # $safeeval->deny(":base_orig");
1.21 albertel 69: $safeinit .= ';$external::target='.$target.';';
1.26 albertel 70: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
1.21 albertel 71: &Apache::run::run($safeinit,$safeeval);
1.3 sakharuk 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 = ();
1.17 albertel 78: &initdepth;
1.3 sakharuk 79: my $token;
1.16 albertel 80: while ( $#pars > -1 ) {
81: while ($token = $pars[$#pars]->get_token) {
82: if ($token->[0] eq 'T') {
1.41 albertel 83: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
84: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
1.16 albertel 85: } elsif ($token->[0] eq 'S') {
1.41 albertel 86: # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
1.16 albertel 87: # add tag to stack
88: push (@stack,$token->[1]);
89: # add parameters list to another stack
90: push (@parstack,&parstring($token));
1.19 albertel 91: &increasedepth($token);
1.16 albertel 92: if (exists $style_for_target{$token->[1]}) {
1.41 albertel 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:
1.16 albertel 104: } else {
1.17 albertel 105: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.41 albertel 106: \@pars, $safeeval, \%style_for_target);
1.16 albertel 107: }
108: } elsif ($token->[0] eq 'E') {
1.41 albertel 109: #if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
1.16 albertel 110: #clear out any tags that didn't end
111: while ($token->[1] ne $stack[$#stack]
1.43 albertel 112: && ($#stack > -1)) {
113: &Apache::lonxml::error("Unbalanced tags in resource $stack['-1']");
114: pop @stack;pop @parstack;&decreasedepth($token);
115: }
1.16 albertel 116:
117: if (exists $style_for_target{'/'."$token->[1]"}) {
1.24 sakharuk 118:
1.25 sakharuk 119: if ($Apache::lonxml::redirection == 1) {
1.16 albertel 120: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
121: $target,$safeeval,\%style_for_target,
122: @parstack);
1.24 sakharuk 123: } else {
1.25 sakharuk 124: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
1.24 sakharuk 125: $target,$safeeval,\%style_for_target,
126: @parstack);
127: }
128:
1.16 albertel 129: } else {
1.17 albertel 130: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.16 albertel 131: \@pars,$safeeval, \%style_for_target);
1.13 albertel 132: }
1.16 albertel 133: }
1.25 sakharuk 134: if ($result ne "") {
1.24 sakharuk 135: if ( $#parstack > -1 ) {
136:
1.25 sakharuk 137: if ($Apache::lonxml::redirection == 1) {
1.13 albertel 138: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
139: $parstack[$#parstack]);
1.24 sakharuk 140: } else {
1.25 sakharuk 141: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
1.24 sakharuk 142: $parstack[$#parstack]);
143: }
144:
1.16 albertel 145: } else {
146: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 147: }
1.16 albertel 148: $result = '';
1.25 sakharuk 149: } else {
150: $finaloutput .= $result;
1.2 sakharuk 151: }
1.19 albertel 152: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
1.5 albertel 153: }
1.16 albertel 154: pop @pars;
1.23 albertel 155: pop @Apache::lonxml::pwd;
1.3 sakharuk 156: }
1.24 sakharuk 157:
1.3 sakharuk 158: return $finaloutput;
1.15 albertel 159: }
160:
161: sub recurse {
162:
163: my @innerstack = ();
164: my @innerparstack = ();
165: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 166: my @pat = ();
1.23 albertel 167: &newparser(\@pat,\$newarg);
1.15 albertel 168: my $tokenpat;
169: my $partstring = '';
170: my $output='';
1.16 albertel 171: my $decls='';
172: while ( $#pat > -1 ) {
173: while ($tokenpat = $pat[$#pat]->get_token) {
174: if ($tokenpat->[0] eq 'T') {
1.30 sakharuk 175: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
1.16 albertel 176: } elsif ($tokenpat->[0] eq 'S') {
177: push (@innerstack,$tokenpat->[1]);
178: push (@innerparstack,&parstring($tokenpat));
1.19 albertel 179: &increasedepth($tokenpat);
1.16 albertel 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]
1.43 albertel 186: && ($#innerstack > -1)) {
187: &Apache::lonxml::error("Unbalanced tags in resource $innerstack['-1']");
188: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
189: }
1.16 albertel 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: $partstring = '';
212: }
1.17 albertel 213: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19 albertel 214: &decreasedepth($tokenpat);}
1.15 albertel 215: }
1.16 albertel 216: pop @pat;
1.23 albertel 217: pop @Apache::lonxml::pwd;
1.15 albertel 218: }
219: return $output;
1.7 albertel 220: }
221:
222: sub callsub {
1.14 albertel 223: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 224: my $currentstring='';
225: {
1.24 sakharuk 226: my $sub1;
1.7 albertel 227: no strict 'refs';
228: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.26 albertel 229: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
1.24 sakharuk 230: $sub1="$space\:\:$sub";
1.17 albertel 231: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.24 sakharuk 232: $currentstring = &$sub1($target,$token,$parstack,$parser,
1.16 albertel 233: $safeeval,$style);
1.7 albertel 234: } else {
1.23 albertel 235: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
1.7 albertel 236: if (defined($token->[4])) {
237: $currentstring = $token->[4];
238: } else {
239: $currentstring = $token->[2];
240: }
241: }
242: use strict 'refs';
243: }
244: return $currentstring;
1.17 albertel 245: }
246:
247: sub initdepth {
248: @Apache::lonxml::depthcounter=();
249: $Apache::lonxml::depth=-1;
250: $Apache::lonxml::olddepth=-1;
251: }
252:
253: sub increasedepth {
1.19 albertel 254: my ($token) = @_;
1.17 albertel 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: }
1.42 albertel 260: my $curdepth=join('_',@Apache::lonxml::depthcounter);
261: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
1.43 albertel 262: #print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
1.17 albertel 263: }
264:
265: sub decreasedepth {
1.19 albertel 266: my ($token) = @_;
1.17 albertel 267: $Apache::lonxml::depth--;
1.36 albertel 268: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
269: $#Apache::lonxml::depthcounter--;
270: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
271: }
1.43 albertel 272: if ( $Apache::lonxml::depth < -1) {
273: &Apache::lonxml::error("Unbalanced tags in resource");
274: $Apache::lonxml::depth='-1';
275: }
1.42 albertel 276: my $curdepth=join('_',@Apache::lonxml::depthcounter);
277: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
1.43 albertel 278: #print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
1.1 sakharuk 279: }
1.19 albertel 280:
281: sub get_all_text {
282:
283: my($tag,$pars)= @_;
284: my $depth=0;
285: my $token;
286: my $result='';
1.24 sakharuk 287: my $tag=substr($tag,1); #strip the / off the tag
288: # &Apache::lonxml::debug("have:$tag:");
1.19 albertel 289: while (($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') {
1.24 sakharuk 296: if ( $token->[1] eq $tag) { $depth--; }
1.19 albertel 297: #skip sending back the last end tag
1.36 albertel 298: if ($depth > -1) { $result.=$token->[2]; } else {
299: $pars->unget_token($token);
300: }
1.19 albertel 301: }
302: }
303: return $result
304: }
305:
1.23 albertel 306: sub newparser {
307: my ($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: }
1.1 sakharuk 317:
1.8 albertel 318: sub parstring {
319: my ($token) = @_;
320: my $temp='';
1.20 albertel 321: map {
1.35 www 322: unless ($_=~/\W/) {
1.42 albertel 323: my $val=$token->[2]->{$_};
324: if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
325: $temp .= "my \$$_=\"$val\";"
1.20 albertel 326: }
327: } @{$token->[3]};
1.8 albertel 328: return $temp;
329: }
1.22 albertel 330:
1.34 www 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:
1.24 sakharuk 342: sub handler {
343: my $request=shift;
1.44 albertel 344:
1.31 sakharuk 345: my $target='web';
1.43 albertel 346: # $Apache::lonxml::debug=1;
1.25 sakharuk 347: if ($ENV{'browser.mathml'}) {
1.27 albertel 348: $request->content_type('text/xml');
349: } else {
350: $request->content_type('text/html');
1.25 sakharuk 351: }
1.29 sakharuk 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);
1.27 albertel 361: $request->send_http_header;
362:
1.45 www 363: return OK if $request->header_only;
1.27 albertel 364:
365: $request->print(&Apache::lontexconvert::header());
366:
1.28 albertel 367: $request->print('<body bgcolor="#FFFFFF">'."\n");
1.27 albertel 368:
1.24 sakharuk 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);
1.29 sakharuk 374:
1.28 albertel 375: $request->print('</body>');
376: $request->print(&Apache::lontexconvert::footer());
1.34 www 377: writeallows($request->uri);
1.45 www 378: return OK;
1.24 sakharuk 379: }
380:
1.22 albertel 381: $Apache::lonxml::debug=0;
382: sub debug {
383: if ($Apache::lonxml::debug eq 1) {
384: print "DEBUG:".$_[0]."<br>\n";
385: }
386: }
387: sub error {
1.44 albertel 388: # print "ERROR:".$_[0]."<br>\n";
1.22 albertel 389: }
390: sub warning {
391: if ($Apache::lonxml::debug eq 1) {
392: print "WARNING:".$_[0]."<br>\n";
393: }
394: }
395:
1.1 sakharuk 396: 1;
397: __END__
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