--- loncom/xml/londefdef.pm	2011/04/13 10:08:06	1.430
+++ loncom/xml/londefdef.pm	2016/08/10 00:29:06	1.456.2.1
@@ -1,8 +1,7 @@
-
 # The LearningOnline Network with CAPA
 # Tags Default Definition Module 
 #
-# $Id: londefdef.pm,v 1.430 2011/04/13 10:08:06 foxr Exp $
+# $Id: londefdef.pm,v 1.456.2.1 2016/08/10 00:29:06 raeburn Exp $
 # 
 #
 # Copyright Michigan State University Board of Trustees
@@ -56,7 +55,7 @@ use LONCAPA();
 
 BEGIN {
 
-    &Apache::lonxml::register('Apache::londefdef',('a','abbr','acronym','accessrule','address','allow','applet','area','b','base','basefont','bgo','bgsound','big','blink','blockquote','blankspace','body','br','button','caption','center','cite','code','col','colgroup','dd','del','dfn','dir','div','dl','dt','em','embed','externallink','fieldset','font','form','frame','frameset','h1','h2','h3','h4','h5','h6','head','hr','html','i','iframe','img','input','ins','insert','isindex','kbd','keygen','label','layer','legend','li','link','m','map','marquee','menu','meta','multicol','nobr','noembed','noframes','nolayer','noscript','object','ol','optgroup','option','output','p','param','pre','q','s','samp','select','server','small','spacer','span','strike','strong','sub','sup','table','tbody','td','textarea','tfoot','th','thead','title','tr','tt','tthoption','u','ul','var','wbr','hideweboutput'));
+    &Apache::lonxml::register('Apache::londefdef',('a','abbr','acronym','accessrule','address','allow','applet','area','b','base','basefont','bgo','bgsound','big','blink','blockquote','blankspace','body','br','button','caption','center','cite','code','col','colgroup','dd','del','dfn','dir','div','dl','dt','em','embed','externallink','fieldset','font','form','frame','frameset','h1','h2','h3','h4','h5','h6','head','hr','html','i','iframe','img','input','ins','insert','isindex','kbd','keygen','label','layer','legend','li','link','m','map','marquee','menu','meta','multicol','nobr','noembed','noframes','nolayer','noscript','object','ol','optgroup','option','output','p','param','pre','q','s','samp','select','server','small','spacer','span','strike','strong','style','sub','sup','table','tbody','td','textarea','tfoot','th','thead','title','tr','tt','tthoption','u','ul','var','wbr','hideweboutput'));
 
 }
 
@@ -384,6 +383,9 @@ sub start_meta {
 	} else {
 	    $currentstring = $token->[4];
 	}
+        if ($env{'form.grade_imsexport'}) {
+            $currentstring = '';
+        }
     } elsif ($target eq 'meta') {
 	unless (&Apache::lonxml::get_param
 		('http-equiv',$parstack,$safeeval,undef,1)) {
@@ -456,6 +458,32 @@ sub insert_meta {
     <meta />';
 }
 
+#-- <start> tag
+sub start_style {
+	my ($target, $token, $tagstack, $parstack, $parser, $safeeval, $style) = @_;
+	my $currentstring = '';
+
+	if ($target eq 'tex') {
+		Apache::lonxml::startredirection();
+	} else {
+		$currentstring = $token->[4];
+	}
+	
+	return $currentstring;
+}
+
+sub end_style {
+	my ($target, $token, $tagstack, $parstack, $parser, $safeeval) = @_;
+	my $currentstring = '';
+
+	if ($target eq 'tex') {
+		Apache::lonxml::endredirection();
+	} else {
+		$currentstring = $token->[2];
+	}
+	return $currentstring;
+}
+
 # accessrule
 sub start_accessrule {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style) = @_;
@@ -542,9 +570,10 @@ sub start_body {
     # Breadcrumbs
     &Apache::lonhtmlcommon::clear_breadcrumbs();
     if ($env{'request.state'} eq 'construct') {
+        my $url=&Apache::lonnet::hreflocation('',$env{'request.filename'});
         &Apache::lonhtmlcommon::add_breadcrumb({
-            'text'  => 'Construction Space',
-            'href'  => &Apache::loncommon::authorspace(),
+            'text'  => 'Authoring Space',
+            'href'  => &Apache::loncommon::authorspace($url),
         });
         &Apache::lonhtmlcommon::add_breadcrumb({
             'text'  => 'HTML Editor',
@@ -556,26 +585,34 @@ sub start_body {
         # FIXME Where are we?
     }
 
+        my $args = {'add_entries'    => $token->[2],
+                    'force_register' => 1,};
+        if ($target eq 'web') {
+            $args->{'print_suppress'} = 1;
+            if ($env{'request.use_absolute'}) {
+                $args->{'use_absolute'} = $env{'request.use_absolute'};
+            }
+        }
 	$currentstring = 
 	    &Apache::loncommon::start_page($Apache::londefdef::title,
 					   $Apache::londefdef::head
-					      .$extra_head,
-					   {'add_entries'    => $token->[2],
-#					    'no_title'       => 1,
-					    'force_register' => 1});
-
+					      .$extra_head,$args);
         my $header = '';
         if ($env{'request.state'} ne 'published' &&
             $env{'request.state'} ne 'construct') {
             $header=&Apache::lonmenu::constspaceform();
         }
         if ($env{'request.state'} ne 'published') {
-            $header.=&Apache::londefdef::edit_controls();
+            unless ($env{'form.inhibitmenu'} eq 'yes') {
+                $header.=&edit_controls();
+            }
         }
         if ($env{'request.state'} eq 'construct') {
-            $currentstring.=&Apache::loncommon::head_subbox(
-                                &Apache::loncommon::CSTR_pageheader()
-                               .$header);
+            unless ($env{'form.inhibitmenu'} eq 'yes') {
+                $currentstring.=&Apache::loncommon::head_subbox(
+                                    &Apache::loncommon::CSTR_pageheader()
+                                   .$header);
+            }
         } elsif ($env{'request.state'} eq 'edit') {
             $currentstring.=&Apache::loncommon::head_subbox($header);
         }
@@ -602,12 +639,39 @@ sub edit_controls {
     $result .= '
 <div><input type="submit" name="editmode" accesskey="e" value="'.&mt('Edit').'" />';
     if (($env{'request.course.id'}) && ($env{'form.forceedit'})) {
-        my $viewtext = &mt('Course View');
-        if (&Apache::loncommon::course_type() eq 'Community') {
-            $viewtext = &mt('Community View');
+        my $url=&Apache::lonnet::hreflocation('',$env{'request.filename'});
+        if ($url =~ /\.html?$/i) {
+            my ($cdom,$cnum);
+            if ($env{'request.course.id'}) {
+                $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+                $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+                if ($env{'request.filename'} =~ m{/userfiles/supplemental/default|\d+/}) {
+                    if (&Apache::lonnet::is_course_upload($env{'request.filename'},
+                                                          $cnum,$cdom)) {
+                        &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                                                ['folderpath','title']);
+                    }
+                }
+            }
+            my ($symb,$itemtitle,$displayfile,$caller);
+            if ($url =~ m{^/uploaded/$cdom/$cnum/portfolio/syllabus/}) {
+                $itemtitle = &mt('Syllabus');
+                $caller = "/public/$cdom/$cnum/syllabus";
+            } else {
+                $caller = $url;
+                ($symb,$itemtitle,$displayfile) =
+                    &Apache::lonxml::get_courseupload_hierarchy($url,
+                                                                $env{'form.folderpath'},
+                                                                $env{'form.title'});
+            }
+            if (($symb ne '') || ($env{'httpref.'.$url} ne '') ||
+                ($url =~ m{^/uploaded/$cdom/$cnum/portfolio/syllabus/})) {
+                  $result .= ('&nbsp;' x 3).
+                             &Apache::lonhtmlcommon::dependencies_button()."\n".
+                             &Apache::lonhtmlcommon::dependencycheck_js($symb,
+                                 $itemtitle,$url,$env{'form.folderpath'},$caller)."\n";
+            }
         }
-        $result .= ('&nbsp;' x 3).'<input type="button" value="'.
-                   $viewtext.'" onclick="javascript:location.href=currentURL" />';
     }
     $result .= '</div>
 </div>
@@ -1668,6 +1732,15 @@ sub start_a {
                     if (!&Apache::lonnet::allowed('bre',$linkurl)) {
                         if (&Apache::lonnet::is_on_map($url)) {
                             &Apache::lonxml::extlink($linkurl);
+                        } elsif ($env{'request.course.id'}) {
+                            my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+                            my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+                            if ($linkurl =~ m{^([^/]|/uploaded/$cdom/$cnum/(docs|supplemental)/)}) {
+                                my $cleanhref = &clean_docs_httpref($linkurl,$url,$cdom,$cnum);
+                                if ($cleanhref) {
+                                    &Apache::lonxml::extlink($cleanhref);
+                                }
+                            }
                         }
                     }
                 }
@@ -1990,8 +2063,8 @@ sub end_dt {
 
 sub item_cleanup {
     my $item=&Apache::lonxml::endredirection();
-    $item=~s/\\begin{center}//g;
-    $item=~s/\\end{center}//g;
+    $item=~s/\\begin\{center}//g;
+    $item=~s/\\end\{center}//g;
     return $item;
 }
 
@@ -2045,9 +2118,6 @@ sub start_table {
     } elsif ($target eq 'tex') {
 	&disable_para();	# Can't have paras in a table.
 
-
-	#  New table code:
-
 	#  Get the parameters that we can do something about:
 
 	my $border = &Apache::lonxml::get_param('border', $parstack, $safeeval, undef, 0);
@@ -2068,7 +2138,6 @@ sub start_table {
 		$table->cell_border(1); # Default for rules is all if rules not defined.
 	    }
 	}
-	# Only all or nothing for cell borders for now:
 
 	if ((defined $cell_border)) {
 	    if ($cell_border eq 'all') {
@@ -2684,7 +2753,9 @@ sub start_img {
 	my $inside = &Apache::lonxml::get_all_text("/img",$parser,$style);
 	return '';
     }
-    &Apache::lonxml::extlink($src);
+    unless ($src =~ m{^data\:image/gif;base64,}) {
+        &Apache::lonxml::extlink($src);
+    }
     my $currentstring = '';
     my $scaling = .3;
 
@@ -2694,8 +2765,10 @@ sub start_img {
         my $enc = ('yes' eq 
                    lc(&Apache::lonxml::get_param('encrypturl',$parstack,
                       $safeeval)));
-        $currentstring.=&Apache::lonenc::encrypt_ref($token,{'src'=>$src},
-                         $enc);
+        unless ($src =~ m{^data\:image/gif;base64,}) {
+            $currentstring.=&Apache::lonenc::encrypt_ref($token,{'src'=>$src},
+                            $enc);
+        }
 
     # and render unto TeX that which is LaTeX
     } elsif ($target eq 'tex') {
@@ -2738,7 +2811,7 @@ sub start_img {
 
 	# &Apache::lonxml::debug("LaTeX rendering = $latex_rendering image file: $src");
 
-	#if original bmp/gif/jpg/png file exist do following:
+	#if original bmp/gif/jpg/png/svg file exist do following:
 	my $origsrc=$src;
 	my ($path,$file) = &get_eps_image($src);
 	# &Apache::lonnet::logthis("Image source: $src result: $path $file");
@@ -2886,10 +2959,7 @@ sub start_applet {
     &Apache::lonxml::extlink($archive);
     my $currentstring = '';
     if ($target eq 'web' || $target eq 'webgrade') {
-        $currentstring = &Apache::lonenc::encrypt_ref($token,
-                                                      {'code'=>$code,
-                                                       'archive'=>$archive}
-                                                     );
+        $currentstring = $token->[4];
     } elsif ($target eq 'tex') {
         # Turn off some stuff we can't be inside thank you LaTeX
 
@@ -2975,22 +3045,47 @@ sub end_embed {
 #-- <param> tag (end tag forbidden)
 sub start_param {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
-    if (&Apache::lonxml::get_param('name',$parstack,
-				   $safeeval,undef,1)=~/^cabbase$/i) {
+    my $name = &Apache::lonxml::get_param('name',$parstack,$safeeval,
+                                          undef,1);
+    if ($name =~/^cabbase$/i) {
 	my $value=&Apache::lonxml::get_param('value',$parstack,
 					     $safeeval,undef,1);
 	&Apache::lonxml::extlink($value);
-    } 
-  
+    } elsif ($name eq 'flashvars') {
+        if (lc(&Apache::lonxml::get_param('type',$parstack,$safeeval,-2,1))
+            eq 'application/x-shockwave-flash') {
+            my $launcher =
+                &Apache::lonxml::get_param('data',$parstack,$safeeval,-2,1);
+            if ($launcher) {
+                &Apache::lonxml::extlink($launcher);
+            }
+            my $flashvars=&Apache::lonxml::get_param('value',$parstack,
+                                                     $safeeval,undef,1);
+            if ($flashvars ne '') {
+                foreach my $item (split(/\&/,$flashvars)) {
+                    my ($key,$value)=split(/=/,$item,2);
+                    if ($key eq 'content') {
+                        if ($value ne '') {
+                            my ($dir) = ($launcher =~ m{(.+/)[^/]+$});
+                            &Apache::lonxml::extlink($dir.$value);
+                        }
+                    } elsif ($key eq 'thumb') {
+                        if ($value ne '') {
+                            &Apache::lonxml::extlink($value);
+                        }
+                    }
+                }
+            }
+        }
+    }
     my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
-    &Apache::lonxml::extlink($src);
+    if ($src ne '') {
+        &Apache::lonxml::extlink($src);
+    }
     my $currentstring = '';
     if ($target eq 'web' || $target eq 'webgrade') {
 	my %toconvert;
-	my $src=&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
 	if ($src) { $toconvert{'src'}= $src; }
-	my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval,
-					    undef,1);
 	if ($name=~/^cabbase$/i) {
 	    $toconvert{'value'}=&Apache::lonxml::get_param('value',$parstack,
 							   $safeeval,undef,1);
@@ -3355,7 +3450,7 @@ sub start_caption {
     my $currentstring = '';
     if ($target eq 'web' || $target eq 'webgrade') {
 	$currentstring = $token->[4];     
-    } 
+    }
     return $currentstring;
 }
 
@@ -3363,7 +3458,7 @@ sub end_caption {
     my ($target,$token) = @_;
     my $currentstring = '';
     if ($target eq 'web' || $target eq 'webgrade') {
-	$currentstring = $token->[2];    
+	$currentstring = $token->[2];
     } 
     return $currentstring;
 }
@@ -3496,8 +3591,68 @@ sub start_iframe {
     my ($target,$token) = @_;
     my $currentstring = '';
     if ($target eq 'web' || $target eq 'webgrade') {
-	$currentstring = $token->[4];     
-    } 
+        my ($src,$url,$query);
+        if ($token->[2]->{'src'}) {
+            $src = $token->[2]->{'src'};
+        } elsif ($token->[2]->{'SRC'}) {
+            $src = $token->[2]->{'SRC'};
+        }
+        if ($src) {
+            ($url,$query) = ($src =~ /^([^?]+)\??([^?]*)$/);
+            if ($query =~ /inhibitmenu=yes/) {
+                $currentstring = $token->[4];
+            } else {
+                my $inhibit;
+                if ($url =~ m{^[^/.].*\.x?html?$}) {
+                    $inhibit = 1;
+                } elsif ($url =~ m{^/(uploaded|res)/.*\.x?html?$}) {
+                    $inhibit = 1;
+                }
+                if ($inhibit) {
+                    $currentstring = '<iframe ';
+                    foreach my $attrib (@{$token->[3]}) {
+                        if (lc($attrib) eq 'src') {
+                            if ($query) {
+                                $query.='&amp;inhibitmenu=yes';
+                            } else {
+                                $query = 'inhibitmenu=yes';
+                            } 
+                            $currentstring .= 'src="'.$url.'?'.$query.'" ';
+                        } else {
+                            $currentstring .= lc($attrib).'="'.$token->[2]->{$attrib}.'" ';
+                        }
+                    }
+                    $currentstring =~ s/\s+$//;
+                    if ($token->[4] =~ m{/>$}) {
+                        $currentstring .= ' />';
+                    } else {
+                        $currentstring .= '>';
+                    }
+                } else {
+                    $currentstring = $token->[4];
+                }
+            }
+            if (($url !~ m{^https?://}) && ($env{'request.course.id'})) {
+                my $docuri = &Apache::lonnet::hreflocation('',$env{'request.filename'});
+                my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+                my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+                if ($url =~ m{^([^/]|/uploaded/)}) {
+                    my $cleanhref = &clean_docs_httpref($url,$docuri,$cdom,$cnum);
+                    if ($cleanhref) {
+                        &Apache::lonxml::extlink($cleanhref);
+                    }
+                } elsif (($url =~ m{/res/$LONCAPA::domain_re/}) && ($docuri =~ m{^\Q/uploaded/$cdom/$cnum/docs/\E})) {
+                    if (!&Apache::lonnet::allowed('bre',$url)) {
+                        if (&Apache::lonnet::is_on_map($url)) {
+                            &Apache::lonxml::extlink($url);
+                        }
+                    }
+                }
+            }
+        } else {
+            $currentstring = $token->[4];
+        }
+    }
     return $currentstring;
 }
 
@@ -4170,8 +4325,8 @@ sub get_eps_image {
 	&Apache::lonnet::repcopy($orig_src); # Failure is not completely fatal.
     }
     &Apache::lonxml::debug("get_eps_image: Original image: $orig_src");
-    my ($spath, $sname, $sext) = &fileparse($src, qr/\.(bmp|gif|png|jpg|jpeg)/i);
-    $src=~s/\.(bmp|gif|png|jpg|jpeg)$/\.eps/i;
+    my ($spath, $sname, $sext) = &fileparse($src, qr/\.(bmp|gif|png|jpg|jpeg|svg)/i);
+    $src=~s/\.(bmp|gif|png|jpg|jpeg|svg)$/\.eps/i;
     $src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
     &Apache::lonxml::debug("Filelocation gives: $src");
     if (! -e $src) {
@@ -4198,7 +4353,7 @@ sub get_eps_image {
 		    close(FILE);
                 }
 		$src=~s|/home/httpd/html/res|/home/httpd/prtspool|;
-		$src=~s|/home/([^/]*)/public_html/|/home/httpd/prtspool/$1/|;
+		$src=~s|/home/httpd/html/priv/[^/]+/([^/]*)/|/home/httpd/prtspool/$1/|;
 		if ($sext ne "") {	 # Put the ext. back in to uniquify.
 		    $src =~ s/\.eps$/$sext.eps/;
 		}
@@ -4217,7 +4372,7 @@ sub get_eps_image {
 	print FILE "$src\n";
 	close FILE;
 	$src=~s|/home/httpd/html/res|/home/httpd/prtspool|;
-	$src=~s|/home/([^/]*)/public_html/|/home/httpd/prtspool/$1/|;
+	$src=~s|/home/httpd/html/priv/[^/]+/([^/]*)/|/home/httpd/prtspool/$1/|;
     }
     my ($path,$file)=($src=~m|(.*)/([^/]*)$|);
     $path =~ s/ /\_/g;
@@ -4236,7 +4391,7 @@ sub eps_generation {
     my $newsrc = $src;
     $newsrc =~ s/(\.bmp|\.gif|\.jpg|\.jpeg)$/\.eps/i;
     $newsrc=~s{/home/httpd/html/res}{};
-    $newsrc=~s{/home/($LONCAPA::username_re)/public_html/}{/$1/};
+    $newsrc=~s{/home/httpd/html/priv/[^/]+/($LONCAPA::username_re)/}{/$1/};
     $newsrc=~s{/\./}{/};
     $newsrc=~s{/([^/]+)\.(ps|eps)}{/};
     if ($newsrc=~m{/home/httpd/lonUsers/}) {
@@ -4285,17 +4440,17 @@ sub LATEX_length {
     $garbage=~s/^\s+(\S.*)/$1/;#space before 
     $garbage=~s/(.*\S)\s+$/$1/;#space after 
     $garbage=~s/(\s)+/$1/;#only one space
-    $garbage=~s/(\\begin{([^\}]+)}|\\end{([^\}]+)})//g;#remove LaTeX \begin{...} and \end{...}
-    $garbage=~s/(\$\_\{|\$\_|\$\^{|\$\^|\}\$)//g;#remove $_{,$_,$^{,$^,}$
+    $garbage=~s/(\\begin\{([^\}]+)}|\\end\{([^\}]+)})//g;#remove LaTeX \begin{...} and \end{...}
+    $garbage=~s/(\$\_\{|\$\_|\$\^\{|\$\^|\}\$)//g;#remove $_{,$_,$^{,$^,}$
     $garbage=~s/([^\\])\$/$1/g;#$
-    $garbage=~s/(\\ensuremath\{\_\{|\\ensuremath\{\_|\\ensuremath\{\^{|\\ensuremath\{\^|\})//g;#remove \ensuremath{...}
+    $garbage=~s/(\\ensuremath\{\_\{|\\ensuremath\{\_|\\ensuremath\{\^\{|\\ensuremath\{\^|\})//g;#remove \ensuremath{...}
    $garbage=~s/(\\alpha|\\beta|\\gamma|\\delta|\\epsilon|\\verepsilon|\\zeta|\\eta|\\theta|\\vartheta|\\iota|\\kappa|\\lambda|\\mu|\\nu|\\xi|\\pi|\\varpi|\\rho|\\varrho|\\sigma|\\varsigma|\\tau|\\upsilon|\\phi|\\varphi|\\chi|\\psi|\\omega|\\Gamma|\\Delta|\\Theta|\\Lambda|\\Xi|\\Pi|\\Sigma|\\Upsilon|\\Phi|\\Psi|\\Omega)/1/g;
     $garbage=~s/(\\pm|\\mp|\\times|\\div|\\cdot|\\ast|\\star|\\dagger|\\ddagger|\\amalg|\\cap|\\cup|\\uplus|\\sqcap|\\sqcup|\\vee|\\wedge|\\oplus|\\ominus|\\otimes|\\circ|\\bullet|\\diamond|\\lhd|\\rhd|\\unlhd|\\unrhd|\\oslash|\\odot|\\bigcirc|\\Box|\\Diamond|\\bigtriangleup|\\bigtriangledown|\\triangleleft|\\triangleright|\\setminus|\\wr)/1/g;
     $garbage=~s/(\\le|\\ll|\\leq|\\ge|\\geq|\\gg|\\neq|\\doreq|\\sim|\\simeq|\\subset|\\subseteq|\\sqsubset|\\sqsubseteq|\\in|\\vdash|\\models|\\supset|\\supseteq|\\sqsupset|\\sqsupseteq|\\ni|\\dash|\\perp|\\approx|\\cong|\\equiv|\\propto|\\prec|\\preceq|\\parallel|\\asymp|\\smile|\\frown|\\bowtie|\\succ|\\succeq|\\mid)/1/g;
     $garbage=~s/(\\not<|\\\\not\\le|\\not\\prec|\\not\\preceq|\\not\\subset|\\not\\subseteq|\\not\\sqsubseteq|\\not\\in|\\not>|\\not\\ge|\\not\\succ|\\notsucceq|\\not\\supset|\\notsupseteq|\\not\\sqsupseteq|\\notin|\\not=|\\not\\equiv|\\not\\sim|\\not\\simeq|\\not\\approx|\\not\\cong|\\not\\asymp)/1/g;
     $garbage=~s/(\\leftarrow|\\gets|\\Leftarrow|\\rightarrow|\\to|\\Rightarrow|\\leftrightarrow|\\Leftrightarrow|\\mapsto|\\hookleftarrow|\\leftharpoonup|\\leftkarpoondown|\\rightleftharpoons|\\longleftarrow|\\Longleftarrow|\\longrightarrow|\\Longrightarrow|\\longleftrightarrow|\\Longleftrightarrow|\\longmapsto|\\hookrightarrow|\\rightharpoonup|\\rightharpoondown|\\uparrow|\\Uparrow|\\downarrow|\\Downarrow|\\updownarrow|\\Updownarrow|\\nearrow|\\searrow|\\swarrow|\\nwarrow)/11/g;
     $garbage=~s/(\\aleph|\\hbar|\\imath|\\jmath|\\ell|\\wp|\\Re|\\Im|\\mho|\\prime|\\emptyset|\\nabla|\\surd|\\partial|\\top|\\bot|\\vdash|\\dashv|\\forall|\\exists|\\neg|\\flat|\\natural|\\sharp|\\\||\\angle|\\backslash|\\Box|\\Diamond|\\triangle|\\clubsuit|\\diamondsuit|\\heartsuit|\\spadesuit|\\Join|\\infty)/11/g;
-    $garbage=~s/(\\hat{([^}]+)}|\\check{([^}]+)}|\\dot{([^}]+)}|\\breve{([^}]+)}|\\acute{([^}]+)}|\\ddot{([^}]+)}|\\grave{([^}]+)}|\\tilde{([^}]+)}|\\mathring{([^}]+)}|\\bar{([^}]+)}|\\vec{([^}]+)})/$1/g;
+    $garbage=~s/(\\hat\{([^}]+)}|\\check\{([^}]+)}|\\dot\{([^}]+)}|\\breve\{([^}]+)}|\\acute\{([^}]+)}|\\ddot\{([^}]+)}|\\grave\{([^}]+)}|\\tilde\{([^}]+)}|\\mathring\{([^}]+)}|\\bar\{([^}]+)}|\\vec\{([^}]+)})/$1/g;
     #remove some other LaTeX command
     $garbage=~s|\\(\w+)\\|\\|g;	 
     $garbage=~s|\\(\w+)(\s*)|$2|g;	 	 
@@ -4419,7 +4574,7 @@ sub latex_header {
 	"\\usepackage{xcolor}\n".
 	'\usepackage{calc}'.
 	'\usepackage{amsmath}'.
-    '\usepackage{soul}',
+	'\usepackage{soul}'.
 	'\usepackage{amssymb}'.
 	'\usepackage{amsfonts}'.
 	'\usepackage{amsthm}'.
@@ -4445,6 +4600,62 @@ sub latex_header {
 
 }
 
+sub clean_docs_httpref {
+    my ($href,$docuri,$cdom,$cnum) = @_;
+    if ($docuri eq '') {
+        $docuri = &Apache::lonnet::hreflocation('',$env{'request.filename'});
+    }
+    if ($cdom eq '') {
+        $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
+    }
+    if ($cnum eq '') {
+        $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
+    }
+    my $cleanhref;
+    if ($docuri =~ m{^(\Q/uploaded/$cdom/$cnum/\E(?:docs|supplemental)/)(.+/)[^/]+$}) {
+        my $prefix = $1;
+        my $relpath = $2;
+        my ($hrefpath,$fname);
+        if ($href =~ m{^/}) {
+            if ($href =~ m{^\Q$prefix\E(.+/)([^/]+)$}) {
+                $hrefpath = $1;
+                $fname = $2;
+            } else {
+                return $cleanhref;
+            }
+        } else {
+            if ($href =~ m{/}) {  
+                (my $path,$fname) = ($href =~ m{^(.*)/([^/]*)$});
+                $hrefpath = $relpath.$path;
+                if ($path eq '') {
+                    $hrefpath =~ s{/$}{};
+                }
+            } else {
+                $fname = $href;
+                $hrefpath = $relpath;
+                $hrefpath =~ s{/$}{};
+            }
+        }
+        if ($fname ne '') {
+            my $cleanrelpath;
+            foreach my $dir (split(/\//,$hrefpath)) {
+                next if ($dir eq '.');
+                if ($dir eq '..') {
+                    $cleanrelpath =~ s{([^/]+/)$}{};
+                } else {
+                    $cleanrelpath .= $dir.'/';
+                }
+            }
+            if ($cleanrelpath ne '') {
+                $cleanhref = $prefix.$cleanrelpath.$fname;
+            } else {
+                $cleanhref = $prefix.$fname;
+            }
+        }
+    }
+    return $cleanhref;
+}
+
 =pod
 
 =head1 NAME
@@ -4539,7 +4750,23 @@ described at http://www.lon-capa.org.
      	   I'm in a table....
      	}
 
-
+=item clean_docs_httpref($href,$docuri,$cdom,$cnum)
+        HTML pages uploaded to a course which contain dependencies either from iframes,
+        javascript files or objects (FlashPlayerSwf, MediaSrc, XMPSrc, ConfigurationSrc,
+        and PosterImageSrc) for which dependency is another file uploaded to the same
+        course.
+
+        Required input: 
+        href - dependency (either a relative URL, or an absolute URL)
+        Optional inputs:
+        docuri - URL of HTML page containing the dependency
+        cdom - Course domain
+        cnum - CourseID
+
+        Output:
+        returns an absolute URL constructed from the href provided, and the calling context.
+        (this will be null, if the URL does not begin: /uploaded/$cdom/$cnum/docs/ or
+        /uploaded/$cdom/$cnum/supplemental/).
 
 =back