--- loncom/xml/lonxml.pm	2000/06/29 18:52:54	1.7
+++ loncom/xml/lonxml.pm	2001/01/06 15:31:27	1.45
@@ -2,12 +2,18 @@
 # XML Parser Module 
 #
 # last modified 06/26/00 by Alexander Sakharuk
+# 11/6 Gerd Kortemeyer
+# 6/1/1 Gerd Kortemeyer
 
 package Apache::lonxml; 
-
+use vars 
+qw(@pwd $outputstack $redirection $textredirection $on_offimport @extlinks);
 use strict;
 use HTML::TokeParser;
 use Safe;
+use Safe::Hole;
+use Opcode;
+use Apache::Constants(:common);
 
 sub register {
   my $space;
@@ -18,162 +24,215 @@ sub register {
     $Apache::lonxml::alltags{$temptag}=$space;
   }
 }
-
+                                     
 use Apache::style;
 use Apache::lontexconvert;
 use Apache::run;
 use Apache::londefdef;
 use Apache::scripttag;
 #==================================================   Main subroutine: xmlparse  
+@pwd=();
+$outputstack = '';
+$redirection = 1;
+$textredirection = 1;
+$on_offimport = 0;
+@extlinks=();
 
 sub xmlparse {
 
- my ($target,$content_file_string,%style_for_target) = @_;
- my $pars = HTML::TokeParser->new(\$content_file_string);
+ my ($target,$content_file_string,$safeinit,%style_for_target) = @_;
+ if ($target eq 'meta') {
+   $Apache::lonxml::textredirection = 0;
+   $Apache::lonxml::on_offimport = 1;
+ } else {
+   $Apache::lonxml::textredirection = 1;
+   $Apache::lonxml::on_offimport = 0;
+ }
+ my @pars = ();
+ @Apache::lonxml::pwd=();
+ my $pwd=$ENV{'request.filename'};
+ $pwd =~ s:/[^/]*$::;
+ &newparser(\@pars,\$content_file_string,$pwd);
  my $currentstring = '';
  my $finaloutput = ''; 
  my $newarg = '';
- my $tempostring = '';
+ my $result;
+
  my $safeeval = new Safe;
+ my $safehole = new Safe::Hole;
  $safeeval->permit("entereval");
+ $safeeval->permit(":base_math");
+ $safeeval->deny(":base_io");
+ $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
+#need to inspect this class of ops
+# $safeeval->deny(":base_orig");
+ $safeinit .= ';$external::target='.$target.';';
+ $safeinit .= ';$external::randomseed='.&Apache::lonnet::rndseed().';';
+ &Apache::run::run($safeinit,$safeeval);
 #-------------------- Redefinition of the target in the case of compound target
 
  ($target, my @tenta) = split('&&',$target);
 
-#------------------------- Stack definition (in stack we have all current tags)
-
  my @stack = (); 
  my @parstack = ();
-
-#------------------------------------- Parse input string (content_file_string)
- 
+ &initdepth;
  my $token;
- 
- while ($token = $pars->get_token) {
-   if ($token->[0] eq 'T') {
-     $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
-   } elsif ($token->[0] eq 'S') {
-     # add tag to stack 	    
-     push (@stack,$token->[1]);
-     # add parameters list to another stack
-     map {$tempostring .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
-     push (@parstack,$tempostring);
-     $tempostring = '';
-     
-     if (exists $style_for_target{$token->[1]}) {
-       #print "Style for $token->[1] is " .$style_for_target{$token->[1]}."\n";
-       # use style file definition
-
-       $newarg = $style_for_target{$token->[1]};
-       
-       my $pat = HTML::TokeParser->new(\$newarg);
-       my $tokenpat = '';
-       my $partstring = '';
-       my $oustring = '';
-       my $outputstring;
-       
-       while  ($tokenpat = $pat->get_token) {
-	 if ($tokenpat->[0] eq 'T') {
-	   $partstring = $tokenpat->[1];
-	 } elsif ($tokenpat->[0] eq 'S') {
-	   my $sub="start_$tokenpat->[1]";
-	   $partstring = &callsub($sub, $target, $tokenpat, \@parstack)
-	 } elsif ($tokenpat->[0] eq 'E') {
-	   my $sub="end_$tokenpat->[1]";
-	   $partstring = &callsub($sub, $target, $tokenpat, \@parstack)
+ while ( $#pars > -1 ) {
+   while ($token = $pars[$#pars]->get_token) {
+     if ($token->[0] eq 'T') {
+       if ($Apache::lonxml::textredirection == 1) {$result=$token->[1];}
+       # $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
+     } elsif ($token->[0] eq 'S') {
+       # if ($target eq 'meta' and $token->[2]->{metaout} eq 'ON') {$Apache::lonxml::textredirection = 1;}
+       # add tag to stack 	    
+       push (@stack,$token->[1]);
+       # add parameters list to another stack
+       push (@parstack,&parstring($token));
+       &increasedepth($token);       
+       if (exists $style_for_target{$token->[1]}) {
+	 
+	 if ($Apache::lonxml::redirection == 1) {
+	   $finaloutput .= &recurse($style_for_target{$token->[1]},
+				    $target,$safeeval,\%style_for_target,
+				    @parstack);
+	 } else {
+	   $Apache::lonxml::outputstack .=  &recurse($style_for_target{$token->[1]},
+					$target,$safeeval,\%style_for_target,
+					@parstack);
 	 }
-        # generate the my mechanism
-	# map {$partstring =~ s/\$$_/$token->[2]->{$_}/g; } @{$token->[3]};
-	 print "Temp: $parstack[$#parstack]\n";
-	 $oustring .= &Apache::run::evaluate($partstring,$safeeval,$parstack[$#parstack]);
-       }
-       $finaloutput .= $oustring;
-     } else {
-       my $sub="start_$token->[1]";
-       #print "use default definition of tag $sub\n";
-       my $result = &callsub($sub, $target, $token, \@parstack);
-       $finaloutput .= &Apache::run::evaluate($result,$safeeval,$parstack[$#parstack]);
-     }              
-   } elsif ($token->[0] eq 'E')  {
-     # Put here check for correct final tag (to avoid existence of 
-     # starting tag only)
-     
-     pop @stack; 
-     unless (exists $style_for_target{$token->[1]}) {
-       my $sub="end_$token->[1]";
-       $finaloutput .= callsub($sub, $target, $token, \@parstack);
-     }
-     #---- end tag from the style file
-     if (exists $style_for_target{'/'."$token->[1]"}) {
-       $newarg = $style_for_target{'/'."$token->[1]"};
-       if (index($newarg,'script') != -1 ) {
-         my $pat = HTML::TokeParser->new(\$newarg);
-         my $tokenpat;
-         my $partstring = '';
-         my $oustring = '';
-         my $outputstring;
 	 
-         while  ($tokenpat = $pat->get_token) {
-	   if ($tokenpat->[0] eq 'T') {
-	     $oustring .= $tokenpat->[1];
-	   } elsif ($tokenpat->[0] eq 'S') {
-             if ($tokenpat->[1] eq 'script') {
-               while  ($tokenpat = $pat->get_token and $tokenpat->[1] ne 'script') {
-		 if ($tokenpat->[0] eq 'S')  {
-		   
-		   $partstring .=  $tokenpat->[4];
-		 } elsif ($tokenpat->[0] eq 'T') {
-		   $partstring .=  $tokenpat->[1];
-		 } elsif ($tokenpat->[0] eq 'E') {
-		   $partstring .=  $tokenpat->[2];
-		 }
-	       }
-	       
-               my @tempor_list = split(',',$parstack[$#parstack]);
-               my @te_kl = ();
-               my %tempor_hash = ();
-               map {(my $onete,my $twote) = split('=',$_); push (@te_kl,$onete); 
-                    $tempor_hash{$onete} = $twote} @tempor_list;
-               map {$partstring =~ s/\$$_/$tempor_hash{$_}/g; } @te_kl; 
-	       print "want to use run\n";
-               &Apache::run::run($partstring,$safeeval);
-	       
-               $partstring = '';
-	     } elsif ($tokenpat->[1] eq 'evaluate') {		
-	       $outputstring = &Apache::run::evaluate($tokenpat->[2]{expression},$safeeval);
-	       $oustring .=  $outputstring;
-	     } else {
-	       $oustring .= $tokenpat->[4]; 
-	     }
-	   } elsif ($tokenpat->[0] eq 'E' and $tokenpat->[1] ne 'evaluate') {
-             $oustring .= $tokenpat->[1];    
-	   }
-         }
-	 $newarg =  $oustring;
        } else {
-         my @very_temp = split(',',$parstack[$#parstack]);
-         map {my @ret= split('=',$_); $newarg =~ s/\$$ret[0]/$ret[1]/g; } @very_temp;
+	 $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
+			    \@pars, $safeeval, \%style_for_target);
+       }              
+     } elsif ($token->[0] eq 'E')  {
+       #if ($target eq 'meta') {$Apache::lonxml::textredirection = 0;}
+       #clear out any tags that didn't end
+       while ($token->[1] ne $stack[$#stack] 
+	      && ($#stack > -1)) {
+	 &Apache::lonxml::error("Unbalanced tags in resource $stack['-1']");   
+	 pop @stack;pop @parstack;&decreasedepth($token);
        }
        
-       $finaloutput .= $newarg; 
+       if (exists $style_for_target{'/'."$token->[1]"}) {
+
+	if ($Apache::lonxml::redirection == 1) {
+	 $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
+				  $target,$safeeval,\%style_for_target,
+				  @parstack);
+        } else {
+         $Apache::lonxml::outputstack .=  &recurse($style_for_target{'/'."$token->[1]"},
+				  $target,$safeeval,\%style_for_target,
+				  @parstack);
+        }
+
+       } else {
+	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
+			       \@pars,$safeeval, \%style_for_target);
+       }
      }
-     pop @parstack;
+     if ($result ne "") {
+       if ( $#parstack > -1 ) {
+ 
+	if ($Apache::lonxml::redirection == 1) {
+	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
+						$parstack[$#parstack]);
+        } else {
+         $Apache::lonxml::outputstack .= &Apache::run::evaluate($result,$safeeval,
+						$parstack[$#parstack]);
+        }
+
+       } else {
+	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
+       }
+       $result = '';
+     } else {
+         $finaloutput .= $result;
+     }
+     if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
    }
+   pop @pars;
+   pop @Apache::lonxml::pwd;
  }
+
  return $finaloutput;
 }
 
+sub recurse {
+  
+  my @innerstack = (); 
+  my @innerparstack = ();
+  my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
+  my @pat = ();
+  &newparser(\@pat,\$newarg);
+  my $tokenpat;
+  my $partstring = '';
+  my $output='';
+  my $decls='';
+  while ( $#pat > -1 ) {
+    while  ($tokenpat = $pat[$#pat]->get_token) {
+      if ($tokenpat->[0] eq 'T') {
+	  if ($Apache::lonxml::textredirection == 1) {$partstring = $tokenpat->[1];}
+      } elsif ($tokenpat->[0] eq 'S') {
+	push (@innerstack,$tokenpat->[1]);
+	push (@innerparstack,&parstring($tokenpat));
+	&increasedepth($tokenpat);
+	$partstring = &callsub("start_$tokenpat->[1]", 
+			       $target, $tokenpat, \@innerparstack,
+			       \@pat, $safeeval, $style_for_target);
+      } elsif ($tokenpat->[0] eq 'E') {
+	#clear out any tags that didn't end
+	while ($tokenpat->[1] ne $innerstack[$#innerstack] 
+	       && ($#innerstack > -1)) {
+	  &Apache::lonxml::error("Unbalanced tags in resource $innerstack['-1']");
+	  pop @innerstack;pop @innerparstack;&decreasedepth($tokenpat);
+	}
+	$partstring = &callsub("end_$tokenpat->[1]",
+			       $target, $tokenpat, \@innerparstack,
+			       \@pat, $safeeval, $style_for_target);
+      }
+      #pass both the variable to the style tag, and the tag we 
+      #are processing inside the <definedtag>
+      if ( $partstring ne "" ) {
+	if ( $#parstack > -1 ) { 
+	  if ( $#innerparstack > -1 ) { 
+	    $decls= $parstack[$#parstack].$innerparstack[$#innerparstack];
+	  } else {
+	    $decls= $parstack[$#parstack];
+	  }
+	} else {
+	  if ( $#innerparstack > -1 ) { 
+	    $decls=$innerparstack[$#innerparstack];
+	  } else {
+	    $decls='';
+	  }
+	}
+	$output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
+	$partstring = '';
+      }
+      if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
+				 &decreasedepth($tokenpat);}
+    }
+    pop @pat;
+    pop @Apache::lonxml::pwd;
+  }
+  return $output;
+}
+
 sub callsub {
-  my ($sub,$target,$token,@parstack)=@_;
+  my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
   my $currentstring='';
   {
+      my $sub1;
     no strict 'refs';
     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {
-      #print "Calling sub $sub in $space \n";
-      $sub="$space\:\:$sub";
-      $currentstring = &$sub($target,$token,\@parstack);
+      #&Apache::lonxml::debug("Calling sub $sub in $space<br>\n");
+      $sub1="$space\:\:$sub";
+      $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
+      $currentstring = &$sub1($target,$token,$parstack,$parser,
+			     $safeeval,$style);
     } else {
-      #print "NOT Calling sub $sub\n";
+      #&Apache::lonxml::debug("NOT Calling sub $sub in $space<br>\n");
       if (defined($token->[4])) {
 	$currentstring = $token->[4];
       } else {
@@ -185,5 +244,172 @@ sub callsub {
   return $currentstring;
 }
 
+sub initdepth {
+  @Apache::lonxml::depthcounter=();
+  $Apache::lonxml::depth=-1;
+  $Apache::lonxml::olddepth=-1;
+}
+
+sub increasedepth {
+  my ($token) = @_;
+  $Apache::lonxml::depth++;
+  $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
+  if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
+    $Apache::lonxml::olddepth=$Apache::lonxml::depth;
+  }
+  my $curdepth=join('_',@Apache::lonxml::depthcounter);
+  &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
+#print "<br>s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
+}
+
+sub decreasedepth {
+  my ($token) = @_;
+  $Apache::lonxml::depth--;
+  if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
+    $#Apache::lonxml::depthcounter--;
+    $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
+  }
+  if (  $Apache::lonxml::depth < -1) {
+    &Apache::lonxml::error("Unbalanced tags in resource");   
+    $Apache::lonxml::depth='-1';
+  }
+  my $curdepth=join('_',@Apache::lonxml::depthcounter);
+  &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
+#print "<br>e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
+}
+
+sub get_all_text {
+
+ my($tag,$pars)= @_;
+ my $depth=0;
+ my $token;
+ my $result='';
+ my $tag=substr($tag,1); #strip the / off the tag
+# &Apache::lonxml::debug("have:$tag:");
+ while (($depth >=0) && ($token = $pars->get_token)) {
+   if ($token->[0] eq 'T') {
+     $result.=$token->[1];
+   } elsif ($token->[0] eq 'S') {
+     if ($token->[1] eq $tag) { $depth++; }
+     $result.=$token->[4];
+   } elsif ($token->[0] eq 'E')  {
+     if ( $token->[1] eq $tag) { $depth--; }
+     #skip sending back the last end tag
+     if ($depth > -1) { $result.=$token->[2]; } else {
+       $pars->unget_token($token);
+     }
+   }
+ }
+ return $result
+}
+
+sub newparser {
+  my ($parser,$contentref,$dir) = @_;
+  push (@$parser,HTML::TokeParser->new($contentref));
+  if ( $dir eq '' ) {
+    push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
+  } else {
+    push (@Apache::lonxml::pwd, $dir);
+  } 
+#  &Apache::lonxml::debug("pwd:$#Apache::lonxml::pwd");
+#  &Apache::lonxml::debug("pwd:$Apache::lonxml::pwd[$#Apache::lonxml::pwd]");
+}
+
+sub parstring {
+  my ($token) = @_;
+  my $temp='';
+  map {
+    unless ($_=~/\W/) {
+      my $val=$token->[2]->{$_};
+      if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
+      $temp .= "my \$$_=\"$val\";"
+    }
+  } @{$token->[3]};
+  return $temp;
+}
+
+sub writeallows {
+    my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
+    my $thisdir=$thisurl;
+    $thisdir=~s/\/[^\/]+$//;
+    my %httpref=();
+    map {
+       $httpref{'httpref.'.
+ 	        &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl;              } @extlinks;
+    &Apache::lonnet::appenv(%httpref);
+}
+
+sub handler {
+  my $request=shift;
+  
+  my $target='web';
+#  $Apache::lonxml::debug=1;
+  if ($ENV{'browser.mathml'}) {
+    $request->content_type('text/xml');
+  } else {
+    $request->content_type('text/html');
+  }
+
+#  $request->print(<<ENDHEADER);
+#<html>
+#<head>
+#<title>Just test</title>
+#</head>
+#<body bgcolor="#FFFFFF">
+#ENDHEADER
+#  &Apache::lonhomework::send_header($request);
+  $request->send_http_header;
+
+  return OK if $request->header_only;
+
+  $request->print(&Apache::lontexconvert::header());
+
+  $request->print('<body bgcolor="#FFFFFF">'."\n");
+
+  my $file = "/home/httpd/html".$request->uri;
+  my %mystyle;
+  my $result = '';
+  $result = Apache::lonxml::xmlparse($target, &Apache::lonnet::getfile($file),'',%mystyle);
+  $request->print($result);
+
+  $request->print('</body>');
+  $request->print(&Apache::lontexconvert::footer());
+  writeallows($request->uri);
+  return OK;
+}
+ 
+$Apache::lonxml::debug=0;
+sub debug {
+  if ($Apache::lonxml::debug eq 1) {
+    print "DEBUG:".$_[0]."<br>\n";
+  }
+}
+sub error {
+#  print "ERROR:".$_[0]."<br>\n";
+}
+sub warning {
+  if ($Apache::lonxml::debug eq 1) {
+    print "WARNING:".$_[0]."<br>\n";
+  }
+}
+
 1;
 __END__
+
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