--- loncom/xml/lonxml.pm	2000/07/20 15:37:54	1.12
+++ loncom/xml/lonxml.pm	2000/08/03 19:34:11	1.16
@@ -8,6 +8,7 @@ package Apache::lonxml;
 use strict;
 use HTML::TokeParser;
 use Safe;
+use Opcode;
 
 sub register {
   my $space;
@@ -29,135 +30,137 @@ use Apache::scripttag;
 sub xmlparse {
 
  my ($target,$content_file_string,%style_for_target) = @_;
- my $pars = HTML::TokeParser->new(\$content_file_string);
+ my @pars = ();
+ push (@pars,HTML::TokeParser->new(\$content_file_string));
  my $currentstring = '';
  my $finaloutput = ''; 
  my $newarg = '';
+ my $result;
  my $safeeval = new Safe;
  $safeeval->permit("entereval");
+ $safeeval->permit(":base_math");
 #-------------------- 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)
- 
  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,$token->[1]);
-     # add parameters list to another stack
-     push (@parstack,&parstring($token));
-     
-     if (exists $style_for_target{$token->[1]}) {
-       #basically recurse, but we never got more than one level down so just 
-       #create the new context here
-       my @innerstack = (); 
-       my @innerparstack = ();
-       # use style file definition
-       $newarg = $style_for_target{$token->[1]};       
-       my $pat = HTML::TokeParser->new(\$newarg);
-       my $tokenpat = '';
-       my $partstring = '';
-
-       while  ($tokenpat = $pat->get_token) {
-	 if ($tokenpat->[0] eq 'T') {
-	   $partstring = $tokenpat->[1];
-	 } elsif ($tokenpat->[0] eq 'S') {
-	   push (@innerstack,$tokenpat->[1]);
-	   push (@innerparstack,&parstring($tokenpat));
-	   $partstring = &callsub("start_$tokenpat->[1]", 
-				  $target, $tokenpat, \@innerparstack,
-				  $pat, $safeeval);
-	 } elsif ($tokenpat->[0] eq 'E') {
-	   #clear out any tags that didn't end
-	   while ($tokenpat->[1] ne $innerstack[$#innerstack] 
-		  && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}
-	   $partstring = &callsub("end_$tokenpat->[1]",
-				  $target, $tokenpat, \@innerparstack,
-				  $pat, $safeeval);
-	 }
-	 #pass both the variable to the style tag, and the tag we 
-	 #are processing inside the <definedtag>
-	 $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,
-		$parstack[$#parstack].$innerparstack[$#innerparstack]);
-	 if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }
-       }
-     } else {
-       my $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
-			     $pars, $safeeval);
-       $finaloutput .= &Apache::run::evaluate($result,$safeeval,
-					      $parstack[$#parstack]);
-     }              
-   } elsif ($token->[0] eq 'E')  {
-     #clear out any tags that didn't end
-     while ($token->[1] ne $stack[$#stack] 
-	    && ($#stack > 0)) {pop @stack;pop @parstack;}
-
-     if (exists $style_for_target{'/'."$token->[1]"}) {
-       my @innerstack = (); 
-       my @innerparstack = ();
-       $newarg = $style_for_target{'/'."$token->[1]"};
-
-#       print "qqq: $token->[1],$newarg\n";
-
-       my $pat = HTML::TokeParser->new(\$newarg);
-       my $tokenpat;
-       my $partstring = '';
+ print $#pars;
+ while ( $#pars > -1 ) {
+   while ($token = $pars[$#pars]->get_token) {
+     if ($token->[0] eq 'T') {
+       $result=$token->[1];
+#       $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');
+     } elsif ($token->[0] eq 'S') {
+       # add tag to stack 	    
+       push (@stack,$token->[1]);
+       # add parameters list to another stack
+       push (@parstack,&parstring($token));
        
-       while  ($tokenpat = $pat->get_token) {
-	 if ($tokenpat->[0] eq 'T') {
-	   $partstring = $tokenpat->[1];
-	 } elsif ($tokenpat->[0] eq 'S') {
-	   push (@innerstack,$tokenpat->[1]);
-	   push (@innerparstack,&parstring($tokenpat));
-	   $partstring = &callsub("start_$tokenpat->[1]", 
-				  $target, $tokenpat, \@innerparstack,
-				  $pat, $safeeval);
-	 } elsif ($tokenpat->[0] eq 'E') {
-	   #clear out any tags that didn't end
-	   while ($tokenpat->[1] ne $innerstack[$#innerstack] 
-		  && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}
-	   $partstring = &callsub("end_$tokenpat->[1]",
-				  $target, $tokenpat, \@innerparstack,
-				  $pat, $safeeval);
-	 }
-	 #pass both the variable to the style tag, and the tag we 
-	 #are processing inside the <definedtag>
-	 $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,
-		$parstack[$#parstack].$innerparstack[$#innerparstack]);
-	 if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }
+       if (exists $style_for_target{$token->[1]}) {
+	 $finaloutput .= &recurse($style_for_target{$token->[1]},
+				  $target,$safeeval,\%style_for_target,
+				  @parstack);
+       } else {
+	 my $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
+			       \@pars, $safeeval, \%style_for_target);
+       }              
+     } elsif ($token->[0] eq 'E')  {
+       #clear out any tags that didn't end
+       while ($token->[1] ne $stack[$#stack] 
+	      && ($#stack > -1)) {pop @stack;pop @parstack;}
+       
+       if (exists $style_for_target{'/'."$token->[1]"}) {
+	 $finaloutput .= &recurse($style_for_target{'/'."$token->[1]"},
+				  $target,$safeeval,\%style_for_target,
+				  @parstack);
+       } else {
+	 my $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
+			       \@pars,$safeeval, \%style_for_target);
        }
-     } else {
-       my $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
-			     $pars,$safeeval);
-       $finaloutput .= &Apache::run::evaluate($result,$safeeval,
-					      $parstack[$#parstack]);
      }
-     pop @stack; 
-     pop @parstack;
+     if ($result ne "" ) {
+       if ( $#parstack > -1 ) { 
+	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,
+						$parstack[$#parstack]);
+       } else {
+	 $finaloutput .= &Apache::run::evaluate($result,$safeeval,'');
+       }
+       $result = '';
+     }
+     if ($token->[0] eq 'E') { pop @stack;pop @parstack; }
    }
+   pop @pars;
  }
  return $finaloutput;
 }
 
+sub recurse {
+  
+  my @innerstack = (); 
+  my @innerparstack = ();
+  my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
+  my @pat = ();
+  push (@pat,HTML::TokeParser->new(\$newarg));
+  my $tokenpat;
+  my $partstring = '';
+  my $output='';
+  my $decls='';
+  while ( $#pat > -1 ) {
+    while  ($tokenpat = $pat[$#pat]->get_token) {
+      if ($tokenpat->[0] eq 'T') {
+	$partstring = $tokenpat->[1];
+      } elsif ($tokenpat->[0] eq 'S') {
+	push (@innerstack,$tokenpat->[1]);
+	push (@innerparstack,&parstring($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)) {pop @innerstack;pop @innerparstack;}
+	$partstring = &callsub("end_$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; }
+    }
+    pop @pat;
+  }
+  return $output;
+}
+
 sub callsub {
-  my ($sub,$target,$token,$parstack,$parser,$safeeval)=@_;
+  my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;
   my $currentstring='';
   {
     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,\@$parstack,$parser,$safeeval);
+      $currentstring = &$sub($target,$token,$parstack,$parser,
+			     $safeeval,$style);
     } else {
       #print "NOT Calling sub $sub\n";
       if (defined($token->[4])) {