Annotation of loncom/xml/lonxml.pm, revision 1.50
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: }
1.48 albertel 27:
28: sub printalltags {
29: my $temp;
30: foreach $temp (sort keys %Apache::lonxml::alltags) {
31: &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
32: }
33: }
1.4 albertel 34: use Apache::style;
1.3 sakharuk 35: use Apache::lontexconvert;
1.7 albertel 36: use Apache::run;
1.4 albertel 37: use Apache::londefdef;
1.7 albertel 38: use Apache::scripttag;
1.3 sakharuk 39: #================================================== Main subroutine: xmlparse
1.33 www 40: @pwd=();
41: $outputstack = '';
42: $redirection = 1;
43: $textredirection = 1;
44: $on_offimport = 0;
45: @extlinks=();
1.31 sakharuk 46:
1.3 sakharuk 47: sub xmlparse {
48:
1.18 albertel 49: my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
1.41 albertel 50: if ($target eq 'meta') {
51: $Apache::lonxml::textredirection = 0;
52: $Apache::lonxml::on_offimport = 1;
1.47 albertel 53: } elsif ($target eq 'grade') {
54: $Apache::lonxml::textredirection = 0;
55: $Apache::lonxml::on_offimport = 0;
1.44 albertel 56: } else {
57: $Apache::lonxml::textredirection = 1;
58: $Apache::lonxml::on_offimport = 0;
1.32 sakharuk 59: }
1.48 albertel 60: #&printalltags();
1.16 albertel 61: my @pars = ();
1.23 albertel 62: @Apache::lonxml::pwd=();
63: my $pwd=$ENV{'request.filename'};
64: $pwd =~ s:/[^/]*$::;
65: &newparser(\@pars,\$content_file_string,$pwd);
1.3 sakharuk 66: my $currentstring = '';
67: my $finaloutput = '';
68: my $newarg = '';
1.16 albertel 69: my $result;
1.24 sakharuk 70:
1.3 sakharuk 71: my $safeeval = new Safe;
1.40 albertel 72: my $safehole = new Safe::Hole;
1.6 albertel 73: $safeeval->permit("entereval");
1.13 albertel 74: $safeeval->permit(":base_math");
1.19 albertel 75: $safeeval->deny(":base_io");
1.40 albertel 76: $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
1.19 albertel 77: #need to inspect this class of ops
78: # $safeeval->deny(":base_orig");
1.21 albertel 79: $safeinit .= ';$external::target='.$target.';';
1.26 albertel 80: $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
1.21 albertel 81: &Apache::run::run($safeinit,$safeeval);
1.3 sakharuk 82: #-------------------- Redefinition of the target in the case of compound target
83:
84: ($target, my @tenta) = split('&&',$target);
85:
86: my @stack = ();
87: my @parstack = ();
1.17 albertel 88: &initdepth;
1.3 sakharuk 89: my $token;
1.16 albertel 90: while ( $#pars > -1 ) {
91: while ($token = $pars[$#pars]->get_token) {
92: if ($token->[0] eq 'T') {
1.41 albertel 93: if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
94: # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
1.16 albertel 95: } elsif ($token->[0] eq 'S') {
1.41 albertel 96: # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
1.16 albertel 97: # add tag to stack
98: push (@stack,$token->[1]);
99: # add parameters list to another stack
100: push (@parstack,&parstring($token));
1.19 albertel 101: &increasedepth($token);
1.16 albertel 102: if (exists $style_for_target{$token->[1]}) {
1.41 albertel 103:
104: if ($Apache::lonxml::redirection == 1) {
105: $finaloutput .= &recurse($style_for_target{$token->[1]},
106: $target,$safeeval,\%style_for_target,
107: @parstack);
108: } else {
109: $Apache::lonxml::outputstack .= &recurse($style_for_target{$token->[1]},
110: $target,$safeeval,\%style_for_target,
111: @parstack);
112: }
113:
1.16 albertel 114: } else {
1.17 albertel 115: $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
1.41 albertel 116: \@pars, $safeeval, \%style_for_target);
1.16 albertel 117: }
118: } elsif ($token->[0] eq 'E') {
1.41 albertel 119: #if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
1.16 albertel 120: #clear out any tags that didn't end
121: while ($token->[1] ne $stack[$#stack]
1.43 albertel 122: && ($#stack > -1)) {
1.49 albertel 123: &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']");
1.43 albertel 124: pop @stack;pop @parstack;&decreasedepth($token);
125: }
1.16 albertel 126:
127: if (exists $style_for_target{'/'."$token->[1]"}) {
1.24 sakharuk 128:
1.25 sakharuk 129: if ($Apache::lonxml::redirection == 1) {
1.16 albertel 130: $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
131: $target,$safeeval,\%style_for_target,
132: @parstack);
1.24 sakharuk 133: } else {
1.25 sakharuk 134: $Apache::lonxml::outputstack .= &recurse($style_for_target{'/'."$token->[1]"},
1.24 sakharuk 135: $target,$safeeval,\%style_for_target,
136: @parstack);
137: }
138:
1.16 albertel 139: } else {
1.17 albertel 140: $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
1.16 albertel 141: \@pars,$safeeval, \%style_for_target);
1.13 albertel 142: }
1.16 albertel 143: }
1.25 sakharuk 144: if ($result ne "") {
1.24 sakharuk 145: if ( $#parstack > -1 ) {
146:
1.25 sakharuk 147: if ($Apache::lonxml::redirection == 1) {
1.13 albertel 148: $finaloutput .= &Apache::run::evaluate($result,$safeeval,
149: $parstack[$#parstack]);
1.24 sakharuk 150: } else {
1.25 sakharuk 151: $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
1.24 sakharuk 152: $parstack[$#parstack]);
153: }
154:
1.16 albertel 155: } else {
156: $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
1.13 albertel 157: }
1.16 albertel 158: $result = '';
1.25 sakharuk 159: } else {
160: $finaloutput .= $result;
1.2 sakharuk 161: }
1.19 albertel 162: if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
1.5 albertel 163: }
1.16 albertel 164: pop @pars;
1.23 albertel 165: pop @Apache::lonxml::pwd;
1.3 sakharuk 166: }
1.24 sakharuk 167:
1.3 sakharuk 168: return $finaloutput;
1.15 albertel 169: }
170:
171: sub recurse {
172:
173: my @innerstack = ();
174: my @innerparstack = ();
175: my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
1.16 albertel 176: my @pat = ();
1.23 albertel 177: &newparser(\@pat,\$newarg);
1.15 albertel 178: my $tokenpat;
179: my $partstring = '';
180: my $output='';
1.16 albertel 181: my $decls='';
182: while ( $#pat > -1 ) {
183: while ($tokenpat = $pat[$#pat]->get_token) {
184: if ($tokenpat->[0] eq 'T') {
1.30 sakharuk 185: if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
1.16 albertel 186: } elsif ($tokenpat->[0] eq 'S') {
187: push (@innerstack,$tokenpat->[1]);
188: push (@innerparstack,&parstring($tokenpat));
1.19 albertel 189: &increasedepth($tokenpat);
1.16 albertel 190: $partstring = &callsub("start_$tokenpat->[1]",
191: $target, $tokenpat, \@innerparstack,
192: \@pat, $safeeval, $style_for_target);
193: } elsif ($tokenpat->[0] eq 'E') {
194: #clear out any tags that didn't end
195: while ($tokenpat->[1] ne $innerstack[$#innerstack]
1.43 albertel 196: && ($#innerstack > -1)) {
1.49 albertel 197: &Apache::lonxml::warning("Unbalanced tags in resource $innerstack['-1']");
1.43 albertel 198: pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
199: }
1.16 albertel 200: $partstring = &callsub("end_$tokenpat->[1]",
201: $target, $tokenpat, \@innerparstack,
202: \@pat, $safeeval, $style_for_target);
203: }
204: #pass both the variable to the style tag, and the tag we
205: #are processing inside the <definedtag>
206: if ( $partstring ne "" ) {
207: if ( $#parstack > -1 ) {
208: if ( $#innerparstack > -1 ) {
209: $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
210: } else {
211: $decls= $parstack[$#parstack];
212: }
213: } else {
214: if ( $#innerparstack > -1 ) {
215: $decls=$innerparstack[$#innerparstack];
216: } else {
217: $decls='';
218: }
219: }
220: $output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
221: $partstring = '';
222: }
1.17 albertel 223: if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
1.19 albertel 224: &decreasedepth($tokenpat);}
1.15 albertel 225: }
1.16 albertel 226: pop @pat;
1.23 albertel 227: pop @Apache::lonxml::pwd;
1.15 albertel 228: }
229: return $output;
1.7 albertel 230: }
231:
232: sub callsub {
1.14 albertel 233: my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
1.7 albertel 234: my $currentstring='';
235: {
1.24 sakharuk 236: my $sub1;
1.7 albertel 237: no strict 'refs';
238: if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
1.26 albertel 239: #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
1.24 sakharuk 240: $sub1="$space\:\:$sub";
1.17 albertel 241: $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
1.24 sakharuk 242: $currentstring = &$sub1($target,$token,$parstack,$parser,
1.16 albertel 243: $safeeval,$style);
1.7 albertel 244: } else {
1.23 albertel 245: #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
1.7 albertel 246: if (defined($token->[4])) {
247: $currentstring = $token->[4];
248: } else {
249: $currentstring = $token->[2];
250: }
251: }
252: use strict 'refs';
253: }
254: return $currentstring;
1.17 albertel 255: }
256:
257: sub initdepth {
258: @Apache::lonxml::depthcounter=();
259: $Apache::lonxml::depth=-1;
260: $Apache::lonxml::olddepth=-1;
261: }
262:
263: sub increasedepth {
1.19 albertel 264: my ($token) = @_;
1.17 albertel 265: $Apache::lonxml::depth++;
266: $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
267: if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
268: $Apache::lonxml::olddepth=$Apache::lonxml::depth;
269: }
1.42 albertel 270: my $curdepth=join('_',@Apache::lonxml::depthcounter);
271: &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
1.43 albertel 272: #print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
1.17 albertel 273: }
274:
275: sub decreasedepth {
1.19 albertel 276: my ($token) = @_;
1.17 albertel 277: $Apache::lonxml::depth--;
1.36 albertel 278: if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
279: $#Apache::lonxml::depthcounter--;
280: $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
281: }
1.43 albertel 282: if ( $Apache::lonxml::depth < -1) {
1.49 albertel 283: &Apache::lonxml::warning("Unbalanced tags in resource");
1.43 albertel 284: $Apache::lonxml::depth='-1';
285: }
1.42 albertel 286: my $curdepth=join('_',@Apache::lonxml::depthcounter);
287: &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
1.43 albertel 288: #print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
1.1 sakharuk 289: }
1.19 albertel 290:
291: sub get_all_text {
292:
293: my($tag,$pars)= @_;
294: my $depth=0;
295: my $token;
296: my $result='';
1.24 sakharuk 297: my $tag=substr($tag,1); #strip the / off the tag
1.49 albertel 298: #&Apache::lonxml::debug("have:$tag:");
1.19 albertel 299: while (($depth >=0) && ($token = $pars->get_token)) {
1.49 albertel 300: #&Apache::lonxml::debug("token:$token->[0]:$depth:$token->[1]");
1.19 albertel 301: if ($token->[0] eq 'T') {
302: $result.=$token->[1];
303: } elsif ($token->[0] eq 'S') {
304: if ($token->[1] eq $tag) { $depth++; }
305: $result.=$token->[4];
306: } elsif ($token->[0] eq 'E') {
1.24 sakharuk 307: if ( $token->[1] eq $tag) { $depth--; }
1.19 albertel 308: #skip sending back the last end tag
1.36 albertel 309: if ($depth > -1) { $result.=$token->[2]; } else {
310: $pars->unget_token($token);
311: }
1.19 albertel 312: }
313: }
1.49 albertel 314: # &Apache::lonxml::debug("Exit:$result:");
1.19 albertel 315: return $result
316: }
317:
1.23 albertel 318: sub newparser {
319: my ($parser,$contentref,$dir) = @_;
320: push (@$parser,HTML::TokeParser->new($contentref));
321: if ( $dir eq '' ) {
322: push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
323: } else {
324: push (@Apache::lonxml::pwd, $dir);
325: }
326: # &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
327: # &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
328: }
1.1 sakharuk 329:
1.8 albertel 330: sub parstring {
331: my ($token) = @_;
332: my $temp='';
1.20 albertel 333: map {
1.35 www 334: unless ($_=~/\W/) {
1.42 albertel 335: my $val=$token->[2]->{$_};
336: if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
337: $temp .= "my \$$_=\"$val\";"
1.20 albertel 338: }
339: } @{$token->[3]};
1.8 albertel 340: return $temp;
341: }
1.22 albertel 342:
1.34 www 343: sub writeallows {
344: my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
345: my $thisdir=$thisurl;
346: $thisdir=~s/\/[^\/]+$//;
347: my %httpref=();
348: map {
349: $httpref{'httpref.'.
350: &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl; } @extlinks;
351: &Apache::lonnet::appenv(%httpref);
352: }
353:
1.24 sakharuk 354: sub handler {
355: my $request=shift;
1.44 albertel 356:
1.31 sakharuk 357: my $target='web';
1.48 albertel 358: $Apache::lonxml::debug=0;
1.25 sakharuk 359: if ($ENV{'browser.mathml'}) {
1.27 albertel 360: $request->content_type('text/xml');
361: } else {
362: $request->content_type('text/html');
1.25 sakharuk 363: }
1.29 sakharuk 364:
365: # $request->print(<<ENDHEADER);
366: #<html>
367: #<head>
368: #<title>Just test</title>
369: #</head>
370: #<body bgcolor="#FFFFFF">
371: #ENDHEADER
372: # &Apache::lonhomework::send_header($request);
1.27 albertel 373: $request->send_http_header;
374:
1.45 www 375: return OK if $request->header_only;
1.27 albertel 376:
377: $request->print(&Apache::lontexconvert::header());
378:
1.28 albertel 379: $request->print('<body bgcolor="#FFFFFF">'."\n");
1.27 albertel 380:
1.50 ! albertel 381: my $file=&Apache::lonnet::filelocation("",$request->uri);
1.24 sakharuk 382: my %mystyle;
1.50 ! albertel 383: my $result = '';
! 384: my $filecontents=&Apache::lonnet::getfile($file);
! 385: if ($filecontents == -1) {
! 386: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
! 387: $filecontents='';
! 388: } else {
! 389: $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%mystyle);
! 390: }
1.24 sakharuk 391: $request->print($result);
1.29 sakharuk 392:
1.50 ! albertel 393:
1.28 albertel 394: $request->print('</body>');
395: $request->print(&Apache::lontexconvert::footer());
1.34 www 396: writeallows($request->uri);
1.45 www 397: return OK;
1.24 sakharuk 398: }
399:
1.22 albertel 400: $Apache::lonxml::debug=0;
401: sub debug {
402: if ($Apache::lonxml::debug eq 1) {
403: print "DEBUG:".$_[0]."<br>\n";
404: }
405: }
1.49 albertel 406:
1.22 albertel 407: sub error {
1.49 albertel 408: print "ERROR:".$_[0]."<br>\n";
1.22 albertel 409: }
1.49 albertel 410:
1.22 albertel 411: sub warning {
412: if ($Apache::lonxml::debug eq 1) {
413: print "WARNING:".$_[0]."<br>\n";
414: }
415: }
416:
1.1 sakharuk 417: 1;
418: __END__
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