--- loncom/xml/lonxml.pm	2000/08/03 19:34:11	1.16
+++ loncom/xml/lonxml.pm	2001/02/13 00:15:49	1.51
@@ -2,13 +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 qw(:common);
 
 sub register {
   my $space;
@@ -19,80 +24,147 @@ sub register {
     $Apache::lonxml::alltags{$temptag}=$space;
   }
 }
-                                     
+
+sub printalltags {
+  my $temp;
+  foreach $temp (sort keys %Apache::lonxml::alltags) {
+    &Apache::lonxml::debug("$temp -- $Apache::lonxml::alltags{$temp}");
+  }
+}
 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 ($target,$content_file_string,$safeinit,%style_for_target) = @_;
+ if ($target eq 'meta') {
+   $Apache::lonxml::textredirection = 0;
+   $Apache::lonxml::on_offimport = 1;
+ } elsif ($target eq 'grade') {
+   $Apache::lonxml::textredirection = 0;
+   $Apache::lonxml::on_offimport = 0;
+ } else {
+   $Apache::lonxml::textredirection = 1;
+   $Apache::lonxml::on_offimport = 0;
+ }
+ #&printalltags();
  my @pars = ();
- push (@pars,HTML::TokeParser->new(\$content_file_string));
+ @Apache::lonxml::pwd=();
+ my $pwd=$ENV{'request.filename'};
+ $pwd =~ s:/[^/]*$::;
+ &newparser(\@pars,\$content_file_string,$pwd);
  my $currentstring = '';
  my $finaloutput = ''; 
  my $newarg = '';
  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);
 
  my @stack = (); 
  my @parstack = ();
+ &initdepth;
  my $token;
- 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],$safeeval,'');
+       if ($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]}) {
-	 $finaloutput .= &recurse($style_for_target{$token->[1]},
-				  $target,$safeeval,\%style_for_target,
-				  @parstack);
+	 
+	 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 {
-	 my $result = &callsub("start_$token->[1]", $target, $token,\@parstack,
-			       \@pars, $safeeval, \%style_for_target);
+	 $result = &callsub("start_$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] 
-	      && ($#stack > -1)) {pop @stack;pop @parstack;}
+	      && ($#stack > -1)) {
+	 &Apache::lonxml::warning("Unbalanced tags in resource $stack['-1']");   
+	 pop @stack;pop @parstack;&decreasedepth($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);
+        }
+
        } else {
-	 my $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
+	 $result = &callsub("end_$token->[1]", $target, $token, \@parstack,
 			       \@pars,$safeeval, \%style_for_target);
        }
      }
-     if ($result ne "" ) {
-       if ( $#parstack > -1 ) { 
+     if ($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; }
+     if ($token->[0] eq 'E') { pop @stack;pop @parstack;&decreasedepth($token);}
    }
    pop @pars;
+   pop @Apache::lonxml::pwd;
  }
+
  return $finaloutput;
 }
 
@@ -102,7 +174,7 @@ sub recurse {
   my @innerparstack = ();
   my ($newarg,$target,$safeeval,$style_for_target,@parstack) = @_;
   my @pat = ();
-  push (@pat,HTML::TokeParser->new(\$newarg));
+  &newparser(\@pat,\$newarg);
   my $tokenpat;
   my $partstring = '';
   my $output='';
@@ -110,17 +182,21 @@ sub recurse {
   while ( $#pat > -1 ) {
     while  ($tokenpat = $pat[$#pat]->get_token) {
       if ($tokenpat->[0] eq 'T') {
-	$partstring = $tokenpat->[1];
+	  if ($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] 
-	       && ($#innerstack > -1)) {pop @innerstack;pop @innerparstack;}
+	       && ($#innerstack > -1)) {
+	  &Apache::lonxml::warning("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);
@@ -144,9 +220,11 @@ sub recurse {
 	$output .= &Apache::run::evaluate($partstring,$safeeval,$decls);
 	$partstring = '';
       }
-      if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }
+      if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack;
+				 &decreasedepth($tokenpat);}
     }
     pop @pat;
+    pop @Apache::lonxml::pwd;
   }
   return $output;
 }
@@ -155,14 +233,16 @@ sub callsub {
   my ($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,$parstack,$parser,
+      #&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 {
@@ -174,16 +254,166 @@ 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::warning("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 = $pars->get_token)) {
+   #&Apache::lonxml::debug("token:$token->[0]:$depth:$token->[1]");
+   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);
+     }
+   }
+ }
+# &Apache::lonxml::debug("Exit:$result:");
+ 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 $temp='';
-  map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};
+  map {
+    unless ($_=~/\W/) {
+      my $val=$token->[2]->{$_};
+      $val =~ s/([\%\@\\])/\$1/;
+      #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
+      $temp .= "my \$$_=\"$val\";"
+    }
+  } @{$token->[3]};
   return $temp;
 }
-1;
-__END__
 
+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';
+  $Apache::lonxml::debug=0;
+  if ($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 $file=&Apache::lonnet::filelocation("",$request->uri);
+  my %mystyle;
+  my $result = ''; 
+  my $filecontents=&Apache::lonnet::getfile($file);
+  if ($filecontents == -1) {
+    &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
+    $filecontents='';
+  } else {
+    $result = &Apache::lonxml::xmlparse($target,$filecontents,'',%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__