--- loncom/xml/lonxml.pm	2007/09/05 01:03:21	1.449.2.1
+++ loncom/xml/lonxml.pm	2009/11/30 21:17:41	1.501
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # XML Parser Module 
 #
-# $Id: lonxml.pm,v 1.449.2.1 2007/09/05 01:03:21 albertel Exp $
+# $Id: lonxml.pm,v 1.501 2009/11/30 21:17:41 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -37,6 +37,25 @@
 # to any other parties under any circumstances.
 #
 
+=pod
+
+=head1 NAME
+
+Apache::lonxml
+
+=head1 SYNOPSIS
+
+XML Parsing Module
+
+This is part of the LearningOnline Network with CAPA project
+described at http://www.lon-capa.org.
+
+
+=head1 SUBROUTINES
+
+=cut
+
+
 
 package Apache::lonxml; 
 use vars 
@@ -90,10 +109,14 @@ use Apache::lonfeedback();
 use Apache::lonmsg();
 use Apache::loncacc();
 use Apache::lonmaxima();
+use Apache::lonr();
 use Apache::lonlocal;
+use Apache::lonhtmlcommon();
+
+#====================================   Main subroutine: xmlparse  
 
-#==================================================   Main subroutine: xmlparse  
 #debugging control, to turn on debugging modify the correct handler
+
 $Apache::lonxml::debug=0;
 
 # keeps count of the number of warnings and errors generated in a parse
@@ -135,6 +158,16 @@ $Apache::lonxml::request='';
 $Apache::lonxml::counter=1;
 $Apache::lonxml::counter_changed=0;
 
+# Part counter hash.   In analysis mode, the
+# problems can use this to record which parts increment the counter
+# by how much.  The counter subs will maintain this hash via
+# their optional part parameters.  Note that the assumption is that
+# analysis is done in one request and therefore it is not necessary to
+# save this information request-to-request.
+
+
+%Apache::lonxml::counters_per_part = ();
+
 #internal check on whether to look at style defs
 $Apache::lonxml::usestyle=1;
 
@@ -349,8 +382,8 @@ sub xmlparse {
 				   $safeeval,\%style_for_target,1);
 
  if (@stack) {
-     &warning("At end of file some tags were still left unclosed, ".
-	      '<tt>&lt;'.join('&gt;</tt>, <tt>&lt;',reverse(@stack)).
+     &warning(&mt('At end of file some tags were still left unclosed:').
+	      ' <tt>&lt;'.join('&gt;</tt>, <tt>&lt;',reverse(@stack)).
 	      '&gt;</tt>');
  }
  if ($env{'request.uri'}) {
@@ -365,8 +398,12 @@ sub xmlparse {
      $finaloutput .= join('',@script_var_displays);
      undef(@script_var_displays);
  }
-
+ &init_state();
  if ($env{'form.return_only_error_and_warning_counts'}) {
+     if ($env{'request.filename'}=~/\.(html|htm|xml)$/i) { 
+        my $error=&verify_html($content_file_string);
+        if ($error) { $errorcount++; }
+     }
      return "$errorcount:$warningcount";
  }
  return $finaloutput;
@@ -470,10 +507,10 @@ sub inner_xmlparse {
 	    while ($token->[1] ne $$stack['-1'] && ($#$stack > -1)) {
 		my $lasttag=$$stack[-1];
 		if ($token->[1] =~ /^\Q$lasttag\E$/i) {
-		    &Apache::lonxml::warning('Using tag &lt;/'.$token->[1].'&gt; on line '.$token->[3].' as end tag to &lt;'.$$stack[-1].'&gt;');
+		    &Apache::lonxml::warning(&mt('Using tag [_1] on line [_2] as end tag to [_3]','&lt;/'.$token->[1].'&gt;','.$token->[3].','&lt;'.$$stack[-1].'&gt;'));
 		    last;
 		} else {
-		    &Apache::lonxml::warning('Found tag &lt;/'.$token->[1].'&gt; on line '.$token->[3].' when looking for &lt;/'.$$stack[-1].'&gt; in file');
+                    &Apache::lonxml::warning(&mt('Found tag [_1] on line [_2] when looking for [_3] in file.','&lt;/'.$token->[1].'&gt;',$token->[3],'&lt;/'.$$stack[-1].'&gt;'));
 		    &end_tag($stack,$parstack,$token);
 		}
 	    }
@@ -489,11 +526,11 @@ sub inner_xmlparse {
 	  if (!$Apache::lonxml::usestyle) {
 	      $extras=$Apache::lonxml::style_values;
 	  }
-	if ( $#$parstack > -1 ) {
-	  $result=&Apache::run::evaluate($result,$safeeval,$extras.$$parstack[-1]);
-	} else {
-	  $result= &Apache::run::evaluate($result,$safeeval,$extras);
-	}
+	  if ( $#$parstack > -1 ) {
+	      $result=&Apache::run::evaluate($result,$safeeval,$extras.$$parstack[-1]);
+	  } else {
+	      $result= &Apache::run::evaluate($result,$safeeval,$extras);
+          }
       }
       $Apache::lonxml::post_evaluate=1;
 
@@ -619,14 +656,36 @@ sub callsub {
   return $currentstring;
 }
 
+{
+    my %state;
+
+    sub init_state {
+	undef(%state);
+    }
+    
+    sub set_state {
+	my ($key,$value) = @_;
+	$state{$key} = $value;
+	return $value;
+    }
+    sub get_state {
+	my ($key) = @_;
+	return $state{$key};
+    }
+}
+
 sub setup_globals {
   my ($request,$target)=@_;
   $Apache::lonxml::request=$request;
   $errorcount=0;
   $warningcount=0;
+  $Apache::lonxml::internal_error=0;
   $Apache::lonxml::default_homework_loaded=0;
   $Apache::lonxml::usestyle=1;
   &init_counter();
+  &clear_bubble_lines_for_part();
+  &init_state();
+  &set_state('target',$target);
   @Apache::lonxml::pwd=();
   @Apache::lonxml::extlinks=();
   @script_var_displays=();
@@ -681,6 +740,7 @@ sub init_safespace {
   $safeeval->permit(":base_math");
   $safeeval->permit("sort");
   $safeeval->permit("time");
+  $safeeval->permit("caller");
   $safeeval->deny("rand");
   $safeeval->deny("srand");
   $safeeval->deny(":base_io");
@@ -690,15 +750,26 @@ sub init_safespace {
   $safehole->wrap(\&Apache::chemresponse::chem_standard_order,$safeeval,
 		  '&chem_standard_order');
   $safehole->wrap(\&Apache::response::check_status,$safeeval,'&check_status');
+  $safehole->wrap(\&Apache::response::implicit_multiplication,$safeeval,'&implicit_multiplication');
 
   $safehole->wrap(\&Apache::lonmaxima::maxima_eval,$safeeval,'&maxima_eval');
   $safehole->wrap(\&Apache::lonmaxima::maxima_check,$safeeval,'&maxima_check');
   $safehole->wrap(\&Apache::lonmaxima::maxima_cas_formula_fix,$safeeval,
 		  '&maxima_cas_formula_fix');
 
+  $safehole->wrap(\&Apache::lonr::r_eval,$safeeval,'&r_eval');
+  $safehole->wrap(\&Apache::lonr::Rentry,$safeeval,'&Rentry');
+  $safehole->wrap(\&Apache::lonr::Rarray,$safeeval,'&Rarray');
+  $safehole->wrap(\&Apache::lonr::r_check,$safeeval,'&r_check');
+  $safehole->wrap(\&Apache::lonr::r_cas_formula_fix,$safeeval,
+                  '&r_cas_formula_fix');
+ 
   $safehole->wrap(\&Apache::caparesponse::capa_formula_fix,$safeeval,
 		  '&capa_formula_fix');
 
+  $safehole->wrap(\&Apache::lonlocal::locallocaltime,$safeeval,
+                  '&locallocaltime');
+
   $safehole->wrap(\&Math::Cephes::asin,$safeeval,'&asin');
   $safehole->wrap(\&Math::Cephes::acos,$safeeval,'&acos');
   $safehole->wrap(\&Math::Cephes::atan,$safeeval,'&atan');
@@ -800,6 +871,7 @@ sub init_safespace {
   $safehole->wrap(\&Math::Random::random_set_seed_from_phrase,$safeeval,'&random_set_seed_from_phrase');
   $safehole->wrap(\&Math::Random::random_get_seed,$safeeval,'&random_get_seed');
   $safehole->wrap(\&Math::Random::random_set_seed,$safeeval,'&random_set_seed');
+  $safehole->wrap(\&Apache::loncommon::languages,$safeeval,'&languages');
   $safehole->wrap(\&Apache::lonxml::error,$safeeval,'&LONCAPA_INTERNAL_ERROR');
   $safehole->wrap(\&Apache::lonxml::debug,$safeeval,'&LONCAPA_INTERNAL_DEBUG');
   $safehole->wrap(\&Apache::lonnet::logthis,$safeeval,'&LONCAPA_INTERNAL_LOGTHIS');
@@ -908,6 +980,9 @@ sub endredirection {
     }
     pop @Apache::lonxml::outputstack;
 }
+sub in_redirection {
+    return ($Apache::lonxml::redirection > 0)
+}
 
 sub end_tag {
   my ($tagstack,$parstack,$token)=@_;
@@ -969,7 +1044,7 @@ sub get_id {
     my ($parstack,$safeeval)=@_;
     my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
     if ($env{'request.state'} eq 'construct' && $id =~ /([._]|[^\w\d\s[:punct:]])/) {
-	&error(&mt("ID &quot;[_1]&quot; contains invalid characters, IDs are only allowed to contain letters, numbers, spaces and -",'<tt>'.$id.'</tt>'));
+	&error(&mt('ID [_1] contains invalid characters. IDs are only allowed to contain letters, numbers, spaces and -','"<tt>'.$id.'</tt>"'));
     }
     if ($id =~ /^\s*$/) { $id = $Apache::lonxml::curdepth; }
     return $id;
@@ -1005,8 +1080,15 @@ sub get_all_text_unbalanced {
 	}
     }
     return $result
+
 }
 
+#########################################################################
+#                                                                       #
+#           bubble line counter management                              #
+#                                                                       #
+#########################################################################
+
 =pod
 
 For bubble grading mode and exam bubble printing mode, the tracking of
@@ -1022,16 +1104,32 @@ Increments the internal counter environm
 
 Optional Arguments:
   $increment - amount to increment by (defaults to 1)
+               Also 1 if the value is negative or zero.
+  $part_response - A concatenation of the part and response id
+                   identifying exactly what is being 'answered'.
+
 
 =cut
 
 sub increment_counter {
-    my ($increment) = @_;
-    if (defined($increment) && $increment gt 0) {
-	$Apache::lonxml::counter+=$increment;
-    } else {
-	$Apache::lonxml::counter++;
+    my ($increment, $part_response) = @_;
+    if ($env{'form.grade_noincrement'}) { return; }
+    if (!defined($increment) || $increment le 0) {
+	$increment = 1;
+    }
+    $Apache::lonxml::counter += $increment;
+
+    # If the caller supplied the response_id parameter, 
+    # Maintain its counter.. creating if necessary.
+
+    if (defined($part_response)) {
+	if (!defined($Apache::lonxml::counters_per_part{$part_response})) {
+	    $Apache::lonxml::counters_per_part{$part_response} = 0;
+	}
+	$Apache::lonxml::counters_per_part{$part_response} += $increment;
+	my $new_value = $Apache::lonxml::counters_per_part{$part_response};
     }
+	
     $Apache::lonxml::counter_changed=1;
 }
 
@@ -1057,7 +1155,7 @@ sub init_counter {
 }
 
 sub store_counter {
-    &Apache::lonnet::appenv(('form.counter' => $Apache::lonxml::counter));
+    &Apache::lonnet::appenv({'form.counter' => $Apache::lonxml::counter});
     $Apache::lonxml::counter_changed=0;
     return '';
 }
@@ -1078,7 +1176,7 @@ sub store_counter {
 
     sub restore_problem_counter {
 	if (defined($state)) {
-	    &Apache::lonnet::appenv(('form.counter' => $state));
+	    &Apache::lonnet::appenv({'form.counter' => $state});
 	}
     }
     sub get_problem_counter {
@@ -1088,6 +1186,73 @@ sub store_counter {
     }
 }
 
+=pod
+
+=item  bubble_lines_for_part(part_response)
+
+Returns the number of lines required to get a response for
+$part_response (this is just $Apache::lonxml::counters_per_part{$part_response}
+
+=cut
+
+sub bubble_lines_for_part {
+    my ($part_response) = @_;
+
+    if (!defined($Apache::lonxml::counters_per_part{$part_response})) {
+	return 0;
+    } else {
+	return $Apache::lonxml::counters_per_part{$part_response};
+    }
+}
+
+=pod
+
+=item clear_bubble_lines_for_part
+
+Clears the hash of bubble lines per part.  If a caller
+needs to analyze several resources this should be called between
+resources to reset the hash for each problem being analyzed.
+
+=cut
+
+sub clear_bubble_lines_for_part {
+    undef(%Apache::lonxml::counters_per_part);
+}
+
+=pod
+
+=item set_bubble_lines(part_response, value)
+
+If there is a problem part, that for whatever reason
+requires bubble lines that are not
+the same as the counter increment, it can call this sub during
+analysis to set its hash value explicitly.
+
+=cut
+
+sub set_bubble_lines {
+    my ($part_response, $value) = @_;
+
+    $Apache::lonxml::counters_per_part{$part_response} = $value;
+}
+
+=pod
+
+=item get_bubble_line_hash
+
+Returns the current bubble line hash.  This is assumed to 
+be small so we return a copy
+
+
+=cut
+
+sub get_bubble_line_hash {
+    return %Apache::lonxml::counters_per_part;
+}
+
+
+#--------------------------------------------------
+
 sub get_all_text {
     my($tag,$pars,$style)= @_;
     my $gotfullstack=1;
@@ -1248,7 +1413,7 @@ sub writeallows {
  	        &Apache::lonnet::hreflocation($thisdir,&unescape($_))}=$thisurl;
     }
     @extlinks=();
-    &Apache::lonnet::appenv(%httpref);
+    &Apache::lonnet::appenv(\%httpref);
 }
 
 sub register_ssi {
@@ -1315,7 +1480,7 @@ sub storefile {
         $fh->close();
         return 1;
     } else {
-	&warning("Unable to save file $file");
+	&warning(&mt('Unable to save file [_1]','<tt>'.$file.'</tt>'));
 	return 0;
     }
 }
@@ -1348,77 +1513,173 @@ SIMPLECONTENT
   return $filecontents;
 }
 
+sub createnewjs {
+    my $filecontents=(<<SIMPLECONTENT);
+<script type="text/javascript" language="Javascript">
+
+</script>
+SIMPLECONTENT
+    return $filecontents;
+}
+
+sub verify_html {
+    my ($filecontents)=@_;
+    if ($filecontents!~/(?:\<|\&lt\;)(?:html|xml)[^\<]*(?:\>|\&gt\;)/is) {
+       return &mt('File does not have [_1] or [_2] starting tag','&lt;html&gt;','&lt;xml&gt;');
+    }
+    if ($filecontents!~/(?:\<|\&lt\;)\/(?:html|xml)(?:\>|\&gt\;)/is) {
+       return &mt('File does not have [_1] or [_2] ending tag','&lt;html&gt;','&lt;xml&gt;');
+    }
+    if ($filecontents!~/(?:\<|\&lt\;)(?:body|frameset)[^\<]*(?:\>|\&gt\;)/is) {
+       return &mt('File does not have [_1] or [_2] starting tag','&lt;body&gt;','&lt;frameset&gt;');
+    }
+    if ($filecontents!~/(?:\<|\&lt\;)\/(?:body|frameset)[^\<]*(?:\>|\&gt\;)/is) {
+       return &mt('File does not have [_1] or [_2] ending tag','&lt;body&gt;','&lt;frameset&gt;');
+    }
+    return '';
+}
+
+sub renderingoptions {
+    my %langchoices=('' => '');
+    foreach (&Apache::loncommon::languageids()) {
+        if (&Apache::loncommon::supportedlanguagecode($_)) {
+            $langchoices{&Apache::loncommon::supportedlanguagecode($_)}
+                       = &Apache::loncommon::plainlanguagedescription($_);
+        }
+    }
+    my $output;
+    unless ($env{'form.forceedit'}) {
+       $output .= '  
+           <span class="LC_nobreak">'.
+           &mt('Language:').' '.
+           &Apache::loncommon::select_form($env{'form.languages'},'languages',
+                                           %langchoices).'
+           </span>';
+    }
+    $output .= '
+     <span class="LC_nobreak">'.
+       &mt('Math Rendering:').' '.
+       &Apache::loncommon::select_form($env{'form.texengine'},'texengine',
+                                                     ('' => '',
+                                                      'tth' => 'tth (TeX to HTML)',
+                                                      'jsMath' => 'jsMath',
+                                                      'mimetex' => 'mimetex (Convert to Images)')).'
+     </span>';
+    return $output;
+}
 
 sub inserteditinfo {
-      my ($result,$filecontents,$filetype)=@_;
+      my ($filecontents, $filetype, $filename)=@_;
       $filecontents = &HTML::Entities::encode($filecontents,'<>&"');
-#      my $editheader='<a href="#editsection">Edit below</a><hr />';
       my $xml_help = '';
       my $initialize='';
-      if ($filetype eq 'html') {
-	  my $addbuttons=&Apache::lonhtmlcommon::htmlareaaddbuttons();
-	  $initialize=&Apache::lonhtmlcommon::spellheader();
-	  if (!&Apache::lonhtmlcommon::htmlareablocked() &&
-	      &Apache::lonhtmlcommon::htmlareabrowser()) {
-	      $initialize.=(<<FULLPAGE);
+      my $textarea_id = 'filecont';
+      my $dragmath_button;
+      my ($add_to_onload, $add_to_onresize);
+      $initialize=&Apache::lonhtmlcommon::spellheader();
+      if ($filetype eq 'html' 
+	  && (!&Apache::lonhtmlcommon::htmlareablocked() &&
+	      &Apache::lonhtmlcommon::htmlareabrowser())) {
+	  $textarea_id .= '___Frame';
+	  my $lang = &Apache::lonhtmlcommon::htmlarea_lang();
+	  $initialize.=(<<FULLPAGE);
 <script type="text/javascript">
-$addbuttons
-
-    HTMLArea.loadPlugin("FullPage");
-
+lonca
     function initDocument() {
-	var editor=new HTMLArea("filecont",config);
-	editor.registerPlugin(FullPage);
-	editor.generate();
+        var oFCKeditor = new FCKeditor('filecont');
+	oFCKeditor.Config['CustomConfigurationsPath'] = '/fckeditor/loncapaconfig.js'  ;
+	oFCKeditor.Config['FullPage'] = true
+	oFCKeditor.Config['AutoDetectLanguage'] = false;
+        oFCKeditor.Config['DefaultLanguage'] = "$lang";
+	oFCKeditor.ReplaceTextarea();
+    }
+    function check_if_dirty(editor) {
+	if (editor.IsDirty()) {
+	    unClean();
+	}
+    }
+    function FCKeditor_OnComplete(editor) {
+	editor.Events.AttachEvent("OnSelectionChange",check_if_dirty);
+	resize_textarea('$textarea_id','LC_aftertextarea');
     }
 </script>
 FULLPAGE
-          } else {
-	      $initialize.=(<<FULLPAGE);
+      } else {
+	  $initialize.=(<<FULLPAGE);
 <script type="text/javascript">
-$addbuttons
     function initDocument() {
+	resize_textarea('$textarea_id','LC_aftertextarea');
     }
 </script>
 FULLPAGE
-	  }
-          $result=~s/\<body([^\>]*)\>/\<body onload="initDocument()" $1\>/i;
+          if ($filetype eq 'html') {
+              $initialize .= "\n".&Apache::lonhtmlcommon::dragmath_js('EditMathPopup');
+              $dragmath_button = &Apache::lonhtmlcommon::dragmath_button('filecont',1);
+          }
+      }
+
+      $add_to_onload = 'initDocument();';
+      $add_to_onresize = "resize_textarea('$textarea_id','LC_aftertextarea');";
+
+      if ($filetype eq 'html') {
 	  $xml_help=&Apache::loncommon::helpLatexCheatsheet();
       }
-      my $cleanbut = '';
 
       my $titledisplay=&display_title();
+      my $wysiwyglink;
       my %lt=&Apache::lonlocal::texthash('st' => 'Save and Edit',
 					 'vi' => 'Save and View',
 					 'dv' => 'Discard Edits and View',
 					 'un' => 'undo',
 					 'ed' => 'Edit');
-      my $buttons=(<<BUTTONS);
-$cleanbut
-<input type="submit" name="discardview" accesskey="d"  value="$lt{'dv'}" />
-<input type="submit" name="Undo" accesskey="u"  value="$lt{'un'}" /><hr>
-<input type="submit" name="savethisfile" accesskey="s"  value="$lt{'st'}" />
-<input type="submit" name="viewmode" accesskey="v" value="$lt{'vi'}" />
-BUTTONS
-      $buttons.=&Apache::lonhtmlcommon::spelllink('xmledit','filecont');
+      my $spelllink .=&Apache::lonhtmlcommon::spelllink('xmledit','filecont');
+      my $textarea_events = &Apache::edit::element_change_detection();
+      my $form_events     = &Apache::edit::form_change_detection();
+      my $htmlerror;
+      if ($filetype eq 'html') {
+          $htmlerror=&verify_html($filecontents);
+          if ($htmlerror) {
+              $htmlerror='<span class="LC_error">'.$htmlerror.'</span>';
+          }
+          if (&Apache::lonhtmlcommon::htmlareabrowser()) {
+              if (&Apache::lonhtmlcommon::htmlareablocked()) {
+                  $wysiwyglink = &Apache::lonhtmlcommon::enablelink($textarea_id);
+              } else {
+                  $wysiwyglink = &Apache::lonhtmlcommon::disablelink($textarea_id);
+              }
+          }
+      }
       my $editfooter=(<<ENDFOOTER);
 $initialize
-<hr />
 <a name="editsection" />
-<form method="post" name="xmledit">
-$xml_help
-<input type="hidden" name="editmode" value="$lt{'ed'}" />
-$buttons<br />
-<textarea style="width:100%" cols="80" rows="44" name="filecont" id="filecont">$filecontents</textarea>
-<br />$buttons
-<br />
+<form $form_events method="post" name="xmledit">
+  <div class="LC_edit_problem_editxml_header">
+    <table class="LC_edit_problem_header_title"><tr><td>
+        $filename
+      </td><td align="right">
+        $xml_help
+      </td></tr>
+    </table>
+    <div class="LC_edit_problem_discards">
+      <input type="submit" name="discardview" accesskey="d" value="$lt{'dv'}" />
+      <input type="submit" name="Undo" accesskey="u" value="$lt{'un'}" />
+      $dragmath_button $spelllink $htmlerror
+    </div>
+    <div class="LC_edit_problem_saves">
+      <input type="submit" name="savethisfile" accesskey="s" value="$lt{'st'}" />
+      <input type="submit" name="viewmode" accesskey="v" value="$lt{'vi'}" />
+    </div>
+  </div>
+  <textarea $textarea_events style="width:100%" cols="80" rows="44" name="filecont" id="filecont">$filecontents</textarea>
+  <div id="LC_aftertextarea">
+    $wysiwyglink
+    <br />
+    $titledisplay
+  </div>
 </form>
-$titledisplay
 </body>
 ENDFOOTER
-#      $result=~s/(\<body[^\>]*\>)/$1$editheader/is;
-      $result=~s/(\<\/body\>)/$editfooter/is;
-      return $result;
+      return ($editfooter,$add_to_onload,$add_to_onresize);;
 }
 
 sub get_target {
@@ -1450,9 +1711,8 @@ sub get_target {
 
 sub handler {
     my $request=shift;
-    
+
     my $target=&get_target();
-    
     $Apache::lonxml::debug=$env{'user.debug'};
     
     &Apache::loncommon::content_type($request,'text/html');
@@ -1461,6 +1721,21 @@ sub handler {
 	$request->set_last_modified(&Apache::lonnet::metadata($request->uri,
 							      'lastrevisiondate'));
     }
+    # Embedded Flash movies from Camtasia served from https will not display in IE
+    #   if XML config file has expired from cache.    
+    if ($ENV{'SERVER_PORT'} == 443) {
+        if ($request->uri =~ /\.xml$/) {
+            my ($httpbrowser,$clientbrowser) =
+                &Apache::loncommon::decode_user_agent($request);
+            if ($clientbrowser =~ /^explorer$/i) {
+                delete $request->headers_out->{'Cache-control'};
+                delete $request->headers_out->{'Pragma'};
+                my $expiration = time + 60;
+                my $date=strftime("%a, %d %b %Y %H:%M:%S GMT",gmtime($expiration));
+                $request->headers_out->set("Expires" => $date);
+            }
+        }
+    }
     $request->send_http_header;
     
     return OK if $request->header_only;
@@ -1468,11 +1743,12 @@ sub handler {
 
     my $file=&Apache::lonnet::filelocation("",$request->uri);
     my $filetype;
-    if ($file =~ /\.sty$/) {
-	$filetype='sty';
+    if ($file =~ /\.(sty|css|js|txt)$/) {
+	$filetype=$1;
     } else {
 	$filetype='html';
     }
+
 #
 # Edit action? Save file.
 #
@@ -1480,6 +1756,9 @@ sub handler {
 	if ($env{'form.savethisfile'} || $env{'form.viewmode'} || $env{'form.Undo'}) {
 	    my $html_file=&Apache::lonnet::getfile($file);
 	    my $error = &Apache::lonhomework::handle_save_or_undo($request, \$html_file, \$env{'form.filecont'});
+            if ($env{'form.savethisfile'}) {
+                $env{'form.editmode'}='Edit'; #force edit mode
+            }
 	}
     }
     my %mystyle;
@@ -1488,17 +1767,22 @@ sub handler {
     if ($filecontents eq -1) {
 	my $start_page=&Apache::loncommon::start_page('File Error');
 	my $end_page=&Apache::loncommon::end_page();
-	my $fnf=&mt('File not found');
+        my $errormsg='<p class="LC_error">'
+                    .&mt('File not found: [_1]'
+                        ,'<span class="LC_filename">'.$file.'</span>')
+                    .'</p>';
 	$result=(<<ENDNOTFOUND);
 $start_page
-<b>$fnf: $file</b>
+$errormsg
 $end_page
 ENDNOTFOUND
         $filecontents='';
 	if ($env{'request.state'} ne 'published') {
 	    if ($filetype eq 'sty') {
 		$filecontents=&createnewsty();
-	    } else {
+            } elsif ($filetype eq 'js') {
+                $filecontents=&createnewjs();
+            } elsif (($filetype ne 'css') && ($filetype ne 'txt')) {
 		$filecontents=&createnewhtml();
 	    }
 	    $env{'form.editmode'}='Edit'; #force edit mode
@@ -1514,43 +1798,103 @@ ENDNOTFOUND
 						    ['editmode']);
 	}
 	if (!$env{'form.editmode'} || $env{'form.viewmode'} || $env{'form.discardview'}) {
-	    &Apache::structuretags::reset_problem_globals();
-	    $result = &Apache::lonxml::xmlparse($request,$target,$filecontents,
-						'',%mystyle);
+            if ($filetype eq 'html' || $filetype eq 'sty') {
+	        &Apache::structuretags::reset_problem_globals();
+	        $result = &Apache::lonxml::xmlparse($request,$target,
+                                                    $filecontents,'',%mystyle);
 	    # .html files may contain <problem> or <Task> need to clean
 	    # up if it did
-	    &Apache::structuretags::reset_problem_globals();
-	    &Apache::lonhomework::finished_parsing();
+	        &Apache::structuretags::reset_problem_globals();
+	        &Apache::lonhomework::finished_parsing();
+            } else {
+                $result = $filecontents;
+            }
 	    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
 						    ['rawmode']);
 	    if ($env{'form.rawmode'}) { $result = $filecontents; }
-	}
+            if ($filetype ne 'html') {
+                my $nochgview = 1; 
+                my $controls = '';
+                    if ($env{'request.state'} eq 'construct') {
+                        $controls = &Apache::loncommon::head_subbox(
+                                        &Apache::loncommon::CSTR_pageheader()
+                                       .&Apache::londefdef::edit_controls($nochgview));
+                    }
+                if ($filetype ne 'sty') {
+                    $result =~ s/</&lt;/g;
+                    $result =~ s/>/&gt;/g;
+                    $result = '<table class="LC_sty_begin">'.
+                              '<tr><td><b><pre>'.$result.
+                              '</pre></b></td></tr></table>';
+                }
+                if ($env{'environment.remote'} eq 'off') {
+                    my $brcrum;
+                    if ($env{'request.state'} eq 'construct') {
+                        $brcrum = [{'href' => &Apache::loncommon::authorspace(),
+                                    'text' => 'Construction Space'},
+                                   {'href' => '',
+                                    'text' => 'Editor'}];
+                    } else {
+                        $brcrum = ''; # FIXME: Where are we?
+                    }
+                    my %options = ('bread_crumbs' => $brcrum,
+                                   'bgcolor'      => '#FFFFFF');
+                    $result =
+                        &Apache::loncommon::start_page(undef,undef,\%options)
+                       .$controls
+                       .$result
+                       .&Apache::loncommon::end_page();
+                } else {
+                    $result = $controls.$result;
+                }
+            }
+        }
     }
-    
+
 #
 # Edit action? Insert editing commands
 #
     unless ($env{'request.state'} eq 'published') {
 	if ($env{'form.editmode'} && (!($env{'form.viewmode'})) && (!($env{'form.discardview'})))
-	    {
+	{
 	    my $displayfile=$request->uri;
 	    $displayfile=~s/^\/[^\/]*//;
-	    my %options = ();
+
+	    my ($edit_info, $add_to_onload, $add_to_onresize)=
+		&inserteditinfo($filecontents,$filetype,$displayfile);
+
+	    my %options = 
+		('add_entries' =>
+                   {'onresize'     => $add_to_onresize,
+                    'onload'       => $add_to_onload,   });
+            my $header;
+            if ($env{'request.state'} eq 'construct') {
+                $options{'bread_crumbs'} = [{
+                            'href' => &Apache::loncommon::authorspace(),
+                            'text' => 'Construction Space'},
+                           {'href' => '',
+                            'text' => 'HTML Editor'}];
+                $header = &Apache::loncommon::head_subbox(
+                              &Apache::loncommon::CSTR_pageheader());
+            }
 	    if ($env{'environment.remote'} ne 'off') {
 		$options{'bgcolor'}   = '#FFFFFF';
+		$options{'only_body'} = 1;
 	    }
-	    my $start_page = &Apache::loncommon::start_page(undef,undef,
+	    my $js =
+		&Apache::edit::js_change_detection().
+		&Apache::loncommon::resize_textarea_js();
+	    my $start_page = &Apache::loncommon::start_page(undef,$js,
 							    \%options);
-	    $result=$start_page.
-		&Apache::lonxml::message_location().'<h3>'.
-		$displayfile.
-		'</h3>'.&Apache::loncommon::end_page();
-	    $result=&inserteditinfo($result,$filecontents,$filetype);
-	}
+            $result = $start_page
+                     .$header
+                     .&Apache::lonxml::message_location()
+                     .$edit_info
+                     .&Apache::loncommon::end_page();
+        }
     }
     if ($filetype eq 'html') { &writeallows($request->uri); }
-	
-    
+
     &Apache::lonxml::add_messages(\$result);
     $request->print($result);
     
@@ -1565,7 +1909,8 @@ sub display_title {
 	    $title = $env{'request.filename'};
 	    $title = substr($title, rindex($title, '/') + 1);
 	}
-	$result = "<script type='text/javascript'>top.document.title = '$title - LON-CAPA Construction Space';</script>";
+        $result = "<script type='text/javascript'>top.document.title = '$title - LON-CAPA "
+                  .&mt('Construction Space')."';</script>";
     }
     return $result;
 }
@@ -1598,22 +1943,47 @@ sub show_error_warn_msg {
 }
 
 sub error {
+    my @errors = @_;
+
     $errorcount++;
+
+    $Apache::lonxml::internal_error=1;
+
+    if (defined($Apache::inputtags::part)) {
+	if ( @Apache::inputtags::response ) {
+	    push(@errors,
+		 &mt("This error occurred while processing response [_1] in part [_2]",
+		     $Apache::inputtags::response[-1],
+		     $Apache::inputtags::part));
+	} else {
+	    push(@errors,
+		 &mt("This error occurred while processing part [_1]",
+		     $Apache::inputtags::part));
+	}
+    }
+
     if ( &show_error_warn_msg() ) {
 	# If printing in construction space, put the error inside <pre></pre>
 	push(@Apache::lonxml::error_messages,
-	     $Apache::lonxml::warnings_error_header.
-	     "<b>ERROR:</b>".join("<br />\n",@_)."<br />\n");
+	     $Apache::lonxml::warnings_error_header
+             .'<div class="LC_error">'
+             .'<b>'.&mt('ERROR:').' </b>'.join("<br />\n",@errors)
+             ."</div>\n");
 	$Apache::lonxml::warnings_error_header='';
     } else {
 	my $errormsg;
 	my ($symb)=&Apache::lonnet::symbread();
 	if ( !$symb ) {
 	    #public or browsers
-	    $errormsg=&mt("An error occured while processing this resource. The author has been notified.");
+	    $errormsg=&mt("An error occurred while processing this resource. The author has been notified.");
 	}
 	my $host=$Apache::lonnet::perlvar{'lonHostID'};
-	my $msg = join('<br />',(@_,"The error occurred on host <tt>$host</tt>"));
+	push(@errors,
+        &mt("The error occurred on host [_1]",
+             "<tt>$host</tt>"));
+
+	my $msg = join('<br />', @errors);
+
 	#notify author
 	&Apache::lonmsg::author_res_msg($env{'request.filename'},$msg);
 	#notify course
@@ -1644,9 +2014,9 @@ sub error {
 		}
 	    }
 	    if ($env{'request.role.adv'}) {
-		$errormsg=&mt("An error occured while processing this resource. The course personnel ([_1]) and the author have been notified.",join(', ',@userlist));
+		$errormsg=&mt("An error occurred while processing this resource. The course personnel ([_1]) and the author have been notified.",join(', ',@userlist));
 	    } else {
-		$errormsg=&mt("An error occured while processing this resource. The instructor has been notified.");
+		$errormsg=&mt("An error occurred while processing this resource. The instructor has been notified.");
 	    }
 	}
 	push(@Apache::lonxml::error_messages,"<b>$errormsg</b> <br />");
@@ -1659,8 +2029,11 @@ sub warning {
     if ($env{'form.grade_target'} ne 'tex') {
 	if ( &show_error_warn_msg() ) {
 	    push(@Apache::lonxml::warning_messages,
-		 $Apache::lonxml::warnings_error_header.
-		 "<b>W</b>ARNING<b>:</b>".join('<br />',@_)."<br />\n");
+		 $Apache::lonxml::warnings_error_header
+                .'<div class="LC_warning">'
+                .&mt('[_1]W[_2]ARNING','<b>','</b>')."<b>:</b> ".join('<br />',@_)
+                ."</div>\n"
+                );
 	    $Apache::lonxml::warnings_error_header='';
 	}
     }
@@ -1885,7 +2258,109 @@ sub get_tag {
     return $insertlist{"$tagnum.tag"};
 }
 
+############################################################
+#                                           PDF-FORM-METHODS
+
+=pod
+
+=item &print_pdf_radiobutton(fieldname, value,  text)
+
+Returns a latexline to generate a PDF-Form-Radiobutton with Text.
+
+$fieldname: PDF internalname of the radiobutton
+$value:     Value of radiobutton (read when dumping the PDF data)
+$text:      Text on the rightside of the radiobutton
+
+=cut
+sub print_pdf_radiobutton {
+    my $result = '';
+    my ($fieldName, $value, $text) = @_;
+    $result .= '\begin{tabularx}{\textwidth}{p{0cm}X}'."\n";
+    $result .= '\radioButton[\symbolchoice{circle}]{'. 
+               $fieldName.'}{10bp}{10bp}{'.$value.'}&'.$text."\n";
+    $result .= '\end{tabularx}' . "\n";
+    $result .= '\hspace{2mm}' . "\n";
+    return $result;
+}
+
+
+=pod
+
+=item &print_pdf_start_combobox(fieldname)
+
+Starts a latexline to generate a PDF-Form-Combobox with text.
+
+$fieldname: PDF internal name of the Combobox
+
+=cut
+sub print_pdf_start_combobox {
+    my $result;
+    my ($fieldName) = @_;
+    $result .= '\begin{tabularx}{\textwidth}{p{2.5cm}X}'."\n";
+    $result .= '\comboBox[]{'.$fieldName.'}{2.3cm}{14bp}{'; # 
+
+    return $result;
+}
+
+
+=pod
+
+=item &print_pdf_add_combobox_option(options)
+
+Generates a latexline to add Options to a PDF-Form-ComboBox.
+
+$option: PDF internal name of the Combobox-Option
+
+=cut
+sub print_pdf_add_combobox_option {
+
+    my $result;
+    my ($option) = @_;  
+
+    $result .= '('.$option.')';
+    
+    return $result;
+}
+
+
+=pod
+
+=item &print_pdf_end_combobox(text) {
+
+Returns latexcode to end a PDF-Form-Combobox with text.
+
+=cut
+sub print_pdf_end_combobox {
+    my $result;
+    my ($text) = @_;
+
+    $result .= '}&'.$text."\\\\\n";
+    $result .= '\end{tabularx}' . "\n";
+    $result .= '\hspace{2mm}' . "\n";
+    return $result;
+}
+
+
+=pod
+
+=item &print_pdf_hiddenField(fieldname, user, domain)
+
+Returns a latexline to generate a PDF-Form-hiddenField with userdata.
+
+$fieldname label for hiddentextfield
+$user:    name of user
+$domain:  domain of user
+
+=cut
+sub print_pdf_hiddenfield {
+    my $result;
+    my ($fieldname, $user, $domain) = @_;
+
+    $result .= '\textField [\F{\FHidden}\F{-\FPrint}\V{'.$domain.'&'.$user.'}]{'.$fieldname.'}{0in}{0in}'."\n";
+
+    return $result;
+}
+
 1;
 __END__
 
-