/* IFrame extension for wikiEditor */

( function( $ ) { $.wikiEditor.extensions.iframe = function( context ) {

/*
 * Event Handlers
 *
 * These act as filters returning false if the event should be ignored or returning true if it should be passed
 * on to all modules. This is also where we can attach some extra information to the events.
 */
context.evt = $.extend( context.evt, {
	/**
	 * Filters change events, which occur when the user interacts with the contents of the iframe. The goal of this
	 * function is to both classify the scope of changes as 'division' or 'character' and to prevent further
	 * processing of events which did not actually change the content of the iframe.
	 */
	'keydown': function( event ) {
		switch ( event.which ) {
			case 90: // z
			case 89: // y
				if ( event.which == 89 && !$.browser.msie ) {
					// only handle y events for IE
					return true;
				} else if ( ( event.ctrlKey || event.metaKey ) && context.history.length ) {
					// HistoryPosition is a negative number between -1 and -context.history.length, in other words
					// it's the number of steps backwards from the latest state.
					var newPosition;
					if ( event.shiftKey || event.which == 89 ) {
						// Redo
						newPosition = context.historyPosition + 1;
					} else {
						// Undo
						newPosition = context.historyPosition - 1;
					}
					// Only act if we are switching to a valid state
					if ( newPosition >= ( context.history.length * -1 ) && newPosition < 0 ) {
						// Make sure we run the history storing code before we make this change
						context.fn.updateHistory( context.oldDelayedHTML != context.$content.html() );
						context.oldDelayedHistoryPosition = context.historyPosition;
						context.historyPosition = newPosition;
						// Change state
						// FIXME: Destroys event handlers, will be a problem with template folding
						context.$content.html(
							context.history[context.history.length + context.historyPosition].html
						);
						context.fn.purgeOffsets();
						if( context.history[context.history.length + context.historyPosition].sel ) {
							context.fn.setSelection( {
								start: context.history[context.history.length + context.historyPosition].sel[0],
								end: context.history[context.history.length + context.historyPosition].sel[1]
							} );
						}
					}
					// Prevent the browser from jumping in and doing its stuff
					return false;
				}
				break;
				// Intercept all tab events to provide consisten behavior across browsers
				// Webkit browsers insert tab characters by default into the iframe rather than changing input focus
			case 9: //tab
					// if any modifier keys are pressed, allow the browser to do it's thing
					if ( event.ctrlKey || event.altKey || event.shiftKey ) {
						return true;
					} else {
						var $tabindexList = $( '[tabindex]:visible' ).sort( function( a, b ) {
							return a.tabIndex - b.tabIndex;
						} );
						for( var i=0; i < $tabindexList.length; i++ ) {
							if( $tabindexList.eq( i ).attr( 'id' ) == context.$iframe.attr( 'id' ) ) {
								$tabindexList.get( i + 1 ).focus();
								break;
							}
						}
						return false;
					}
				break;
			 case 86: //v
				 if ( event.ctrlKey && $.browser.msie && 'paste' in context.evt ) {
					 //paste, intercepted for IE
					 context.evt.paste( event );
				 }
				 break;
		}
		return true;
	},
	'change': function( event ) {
		event.data.scope = 'division';
		var newHTML = context.$content.html();
		if ( context.oldHTML != newHTML ) {
			context.fn.purgeOffsets();
			context.oldHTML = newHTML;
			event.data.scope = 'realchange';
		}
		// Never let the body be totally empty
		if ( context.$content.children().length == 0 ) {
			context.$content.append( '<p></p>' );
		}
		return true;
	},
	'delayedChange': function( event ) {
		event.data.scope = 'division';
		var newHTML = context.$content.html();
		if ( context.oldDelayedHTML != newHTML ) {
			context.oldDelayedHTML = newHTML;
			event.data.scope = 'realchange';
			// Surround by <p> if it does not already have it
			var cursorPos = context.fn.getCaretPosition();
			var t = context.fn.getOffset( cursorPos[0] );
			if ( ! $.browser.msie && t && t.node.nodeName == '#text' && t.node.parentNode.nodeName.toLowerCase() == 'body' ) {
				$( t.node ).wrap( "<p></p>" );
				context.fn.purgeOffsets();
				context.fn.setSelection( { start: cursorPos[0], end: cursorPos[1] } );
			}
		}
		context.fn.updateHistory( event.data.scope == 'realchange' );
		return true;
	},
	'cut': function( event ) {
		setTimeout( function() {
			context.$content.find( 'br' ).each( function() {
				if ( $(this).parent().is( 'body' ) ) {
					$(this).wrap( $( '<p></p>' ) );
				}
			} );
		}, 100 );
		return true;
	},
	'paste': function( event ) {
		// Save the cursor position to restore it after all this voodoo
		var cursorPos = context.fn.getCaretPosition();
		var oldLength = context.fn.getContents().length;
		var positionFromEnd = oldLength - cursorPos[1];

		//give everything the wikiEditor class so that we can easily pick out things without that class as pasted
		context.$content.find( '*' ).addClass( 'wikiEditor' );
		if ( $.layout.name !== 'webkit' ) {
			context.$content.addClass( 'pasting' );
		}

		setTimeout( function() {
			// Kill stuff we know we don't want
			context.$content.find( 'script,style,img,input,select,textarea,hr,button,link,meta' ).remove();
			var nodeToDelete = [];
			var pastedContent = [];
			var firstDirtyNode;
			var $lastDirtyNode;
			var elementAtCursor;
			if ( $.browser.msie && !context.offsets ) {
				elementAtCursor = null;
			} else {
				elementAtCursor = context.fn.getOffset( cursorPos[0] );
			}
			if ( elementAtCursor == null || elementAtCursor.node == null ) {
				context.$content.prepend( '<p class = wikiEditor></p>' );
				firstDirtyNode 	= context.$content.children()[0];
			} else {
				firstDirtyNode = elementAtCursor.node;
			}

			//this is ugly but seems like the best way to handle the case where we select and replace all editor contents
			try {
				firstDirtyNode.parentNode;
			} catch ( err ) {
				context.$content.prepend( '<p class = wikiEditor></p>' );
				firstDirtyNode 	= context.$content.children()[0];
			}

			while ( firstDirtyNode != null ) {
				//we're going to replace the contents of the entire parent node.
				while ( firstDirtyNode.parentNode && firstDirtyNode.parentNode.nodeName != 'BODY'
					 && ! $( firstDirtyNode ).hasClass( 'wikiEditor' )
					) {
					firstDirtyNode = firstDirtyNode.parentNode;
				}
				//go back till we find the first pasted node
				while ( firstDirtyNode.previousSibling != null
						&& ! $( firstDirtyNode.previousSibling ).hasClass( 'wikiEditor' )
					) {

					if ( $( firstDirtyNode.previousSibling ).hasClass( '#comment' ) ) {
						$( firstDirtyNode ).remove();
					} else {
						firstDirtyNode = firstDirtyNode.previousSibling;
					}
				}

				if ( firstDirtyNode.previousSibling != null ) {
					$lastDirtyNode 	= $( firstDirtyNode.previousSibling );
				} else {
					$lastDirtyNode 	= $( firstDirtyNode );
				}

				var cc = makeContentCollector( $.browser, null );
				while ( firstDirtyNode != null ) {
					cc.collectContent(firstDirtyNode);
					cc.notifyNextNode(firstDirtyNode.nextSibling);

					nodeToDelete.push( firstDirtyNode );

					firstDirtyNode = firstDirtyNode.nextSibling;
					if ( $( firstDirtyNode ).hasClass( 'wikiEditor' ) ) {
						break;
					}
				}

				var ccData = cc.finish();
				pastedContent = ccData.lines;
				var pastedPretty = '';
				for ( var i = 0; i < pastedContent.length; i++ ) {
					//escape html
					pastedPretty = pastedContent[i].replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/\r?\n/g, '\\n');
					//replace leading white spaces with &nbsp;
					match = pastedContent[i].match(/^[\s]+[^\s]/);
					if ( match != null && match.length > 0  ) {
						index = match[0].length;
						leadingSpace = match[0].replace(/[\s]/g, '&nbsp;');
						pastedPretty = leadingSpace + pastedPretty.substring(index, pastedPretty.length);
					}


					if( !pastedPretty && $.browser.msie && i == 0 ) {
						continue;
					}
					$newElement = $( '<p class="wikiEditor pasted" ></p>' );
					if ( pastedPretty ) {
						$newElement.html( pastedPretty );
					} else {
						$newElement.html( '<br class="wikiEditor">' );
					}
					$newElement.insertAfter( $lastDirtyNode );

					$lastDirtyNode = $newElement;

				}

				//now delete all the original nodes that we prettified already
				while ( nodeToDelete.length > 0 ) {
					$deleteNode = $( nodeToDelete.pop() );
					$deleteNode.remove();
				}

				//anything without wikiEditor class was pasted.
				$selection = context.$content.find( ':not(.wikiEditor)' );
				if  ( $selection.length == 0 ) {
					break;
				} else {
					firstDirtyNode = $selection.eq( 0 )[0];
				}
			}
			context.$content.find( '.wikiEditor' ).removeClass( 'wikiEditor' );

			//now place the cursor at the end of pasted content
			var newLength = context.fn.getContents().length;
			var newPos = newLength - positionFromEnd;

			context.fn.purgeOffsets();
			context.fn.setSelection( { start: newPos, end: newPos } );

			context.fn.scrollToCaretPosition();
		}, 0 );
		return true;
	},
	'ready': function( event ) {
		// Initialize our history queue
		if ( context.$content ) {
			context.history.push( { 'html': context.$content.html(), 'sel':  context.fn.getCaretPosition() } );
		} else {
			context.history.push( { 'html': '', 'sel':  context.fn.getCaretPosition() } );
		}
		return true;
	}
} );

/**
 * Internally used functions
 */
context.fn = $.extend( context.fn, {
	'highlightLine': function( $element, mode ) {
		if ( !$element.is( 'p' ) ) {
			$element = $element.closest( 'p' );
		}
		$element.css( 'backgroundColor', '#AACCFF' );
		setTimeout( function() { $element.animate( { 'backgroundColor': 'white' }, 'slow' ); }, 100 );
		setTimeout( function() { $element.css( 'backgroundColor', 'white' ); }, 1000 );
	},
	'htmlToText': function( html ) {
		// This function is slow for large inputs, so aggressively cache input/output pairs
		if ( html in context.htmlToTextMap ) {
			return context.htmlToTextMap[html];
		}
		var origHTML = html;

		// We use this elaborate trickery for cross-browser compatibility
		// IE does overzealous whitespace collapsing for $( '<pre />' ).html( html );
		// We also do <br> and easy cases for <p> conversion here, complicated cases are handled later
		html = html
			.replace( /\r?\n/g, "" ) // IE7 inserts newlines before block elements
			.replace( /&nbsp;/g, " " ) // We inserted these to prevent IE from collapsing spaces
			.replace( /\<br[^\>]*\>\<\/p\>/gi, '</p>' ) // Remove trailing <br> from <p>
			.replace( /\<\/p\>\s*\<p[^\>]*\>/gi, "\n" ) // Easy case for <p> conversion
			.replace( /\<br[^\>]*\>/gi, "\n" ) // <br> conversion
			.replace( /\<\/p\>(\n*)\<p[^\>]*\>/gi, "$1\n" )
			// Un-nest <p> tags
			.replace( /\<p[^\>]*\><p[^\>]*\>/gi, '<p>' )
			.replace( /\<\/p\><\/p\>/gi, '</p>' );
		// Save leading and trailing whitespace now and restore it later. IE eats it all, and even Firefox
		// won't leave everything alone
		var leading = html.match( /^\s*/ )[0];
		var trailing = html.match( /\s*$/ )[0];
		html = html.substr( leading.length, html.length - leading.length - trailing.length );
		var $pre = $( '<pre>' + html + '</pre>' );
		$pre.find( '.wikiEditor-noinclude' ).each( function() { $( this ).remove(); } );
		// Convert tabs, <p>s and <br>s back
		$pre.find( '.wikiEditor-tab' ).each( function() { $( this ).text( "\t" ); } );
		$pre.find( 'br' ).each( function() { $( this ).replaceWith( "\n" ); } );
		// Converting <p>s is wrong if there's nothing before them, so check that.
		// .find( '* + p' ) isn't good enough because textnodes aren't considered
		$pre.find( 'p' ).each( function() {
			var text =  $( this ).text();
			// If this <p> is preceded by some text, add a \n at the beginning, and if
			// it's followed by a textnode, add a \n at the end
			// We need the traverser because there can be other weird stuff in between

			// Check for preceding text
			var t = new context.fn.rawTraverser( this.firstChild, this, $pre.get( 0 ), true ).prev();
			while ( t && t.node.nodeName != '#text' && t.node.nodeName != 'BR' && t.node.nodeName != 'P' ) {
				t = t.prev();
			}
			if ( t ) {
				text = "\n" + text;
			}

			// Check for following text
			t = new context.fn.rawTraverser( this.lastChild, this, $pre.get( 0 ), true ).next();
			while ( t && t.node.nodeName != '#text' && t.node.nodeName != 'BR' && t.node.nodeName != 'P' ) {
				t = t.next();
			}
			if ( t && !t.inP && t.node.nodeName == '#text' && t.node.nodeValue.charAt( 0 ) != '\n'
					&& t.node.nodeValue.charAt( 0 ) != '\r' ) {
				text += "\n";
			}
			$( this ).text( text );
		} );
		var retval;
		if ( $.browser.msie ) {
			// IE aggressively collapses whitespace in .text() after having done DOM manipulation,
			// but for some crazy reason this does work. Also convert \r back to \n
			retval = $( '<pre>' + $pre.html() + '</pre>' ).text().replace( /\r/g, '\n' );
		} else {
			retval = $pre.text();
		}
		return context.htmlToTextMap[origHTML] = leading + retval + trailing;
	},
	/**
	 * Get the first element before the selection that's in a certain class
	 * @param classname Class to match. Defaults to '', meaning any class
	 * @param strict If true, the element the selection starts in cannot match (default: false)
	 * @return jQuery object or null if unknown
	 */
	'beforeSelection': function( classname, strict ) {
		if ( typeof classname == 'undefined' ) {
			classname = '';
		}
		var e = null, offset = null;
		if ( $.browser.msie && !context.$iframe[0].contentWindow.document.body ) {
			return null;
		}
		if ( context.$iframe[0].contentWindow.getSelection ) {
			// Firefox and Opera
			var selection = context.$iframe[0].contentWindow.getSelection();
			// On load, webkit seems to not have a valid selection
			if ( selection.baseNode !== null ) {
				// Start at the selection's start and traverse the DOM backwards
				// This is done by traversing an element's children first, then the element itself, then its parent
				e = selection.getRangeAt( 0 ).startContainer;
				offset = selection.getRangeAt( 0 ).startOffset;
			} else {
				return null;
			}

			// When the cursor is on an empty line, Opera gives us a bogus range object with
			// startContainer=endContainer=body and startOffset=endOffset=1
			var body = context.$iframe[0].contentWindow.document.body;
			if ( $.browser.opera && e == body && offset == 1 ) {
				return null;
			}
		}
		if ( !e && context.$iframe[0].contentWindow.document.selection ) {
			// IE
			// Because there's nothing like range.startContainer in IE, we need to do a DOM traversal
			// to find the element the start of the selection is in
			var range = context.$iframe[0].contentWindow.document.selection.createRange();
			// Set range2 to the text before the selection
			var range2 = context.$iframe[0].contentWindow.document.body.createTextRange();
			// For some reason this call throws errors in certain cases, e.g. when the selection is
			// not in the iframe
			try {
				range2.setEndPoint( 'EndToStart', range );
			} catch ( ex ) {
				return null;
			}
			var seekPos = context.fn.htmlToText( range2.htmlText ).length;
			var offset = context.fn.getOffset( seekPos );
			e = offset ? offset.node : null;
			offset = offset ? offset.offset : null;
			if ( !e ) {
				return null;
			}
		}
		if ( e.nodeName != '#text' ) {
			// The selection is not in a textnode, but between two non-text nodes
			// (usually inside the <body> between two <br>s). Go to the rightmost
			// child of the node just before the selection
			var newE = e.firstChild;
			for ( var i = 0; i < offset - 1 && newE; i++ ) {
				newE = newE.nextSibling;
			}
			while ( newE && newE.lastChild ) {
				newE = newE.lastChild;
			}
			e = newE || e;
		}

		// We'd normally use if( $( e ).hasClass( class ) in the while loop, but running the jQuery
		// constructor thousands of times is very inefficient
		var classStr = ' ' + classname + ' ';
		while ( e ) {
			if ( !strict && ( !classname || ( ' ' + e.className + ' ' ).indexOf( classStr ) != -1 ) ) {
				return $( e );
			}
			var next = e.previousSibling;
			while ( next && next.lastChild ) {
				next = next.lastChild;
			}
			e = next || e.parentNode;
			strict = false;
		}
		return $( [] );
	},
	/**
	 * Object used by traverser(). Don't use this unless you know what you're doing
	 */
	'rawTraverser': function( node, inP, ancestor, skipNoinclude ) {
		this.node = node;
		this.inP = inP;
		this.ancestor = ancestor;
		this.skipNoinclude = skipNoinclude;
		this.next = function() {
			var p = this.node;
			var nextInP = this.inP;
			while ( p && !p.nextSibling ) {
				p = p.parentNode;
				if ( p == this.ancestor ) {
					// We're back at the ancestor, stop here
					p = null;
				}
				if ( p && p.nodeName == "P" ) {
					nextInP = null;
				}
			}
			p = p ? p.nextSibling : null;
			if ( p && p.nodeName == "P" ) {
				nextInP = p;
			}
			do {
				// Filter nodes with the wikiEditor-noinclude class
				// Don't use $( p ).hasClass( 'wikiEditor-noinclude' ) because
				// $() is slow in a tight loop
				if ( this.skipNoinclude ) {
					while ( p && ( ' ' + p.className + ' ' ).indexOf( ' wikiEditor-noinclude ' ) != -1 ) {
						p = p.nextSibling;
					}
				}
				if ( p && p.firstChild ) {
					p = p.firstChild;
					if ( p.nodeName == "P" ) {
						nextInP = p;
					}
				}
			} while ( p && p.firstChild );
			// Instead of calling the rawTraverser constructor, inline it. This avoids function call overhead
			return p ? { 'node': p, 'inP': nextInP, 'ancestor': this.ancestor,
					'skipNoinclude': this.skipNoinclude, 'next': this.next, 'prev': this.prev } : null;
		};
		this.prev = function() {
			var p = this.node;
			var prevInP = this.inP;
			while ( p && !p.previousSibling ) {
				p = p.parentNode;
				if ( p == this.ancestor ) {
					// We're back at the ancestor, stop here
					p = null;
				}
				if ( p && p.nodeName == "P" ) {
					prevInP = null;
				}
			}
			p = p ? p.previousSibling : null;
			if ( p && p.nodeName == "P" ) {
				prevInP = p;
			}
			do {
				// Filter nodes with the wikiEditor-noinclude class
				// Don't use $( p ).hasClass( 'wikiEditor-noinclude' ) because
				// $() is slow in a tight loop
				if ( this.skipNoinclude ) {
					while ( p && ( ' ' + p.className + ' ' ).indexOf( ' wikiEditor-noinclude ' ) != -1 ) {
						p = p.previousSibling;
					}
				}
				if ( p && p.lastChild ) {
					p = p.lastChild;
					if ( p.nodeName == "P" ) {
						prevInP = p;
					}
				}
			} while ( p && p.lastChild );
			// Instead of calling the rawTraverser constructor, inline it. This avoids function call overhead
			return p ? { 'node': p, 'inP': prevInP, 'ancestor': this.ancestor,
					'skipNoinclude': this.skipNoinclude, 'next': this.next, 'prev': this.prev } : null;
		};
	},
	/**
	 * Get an object used to traverse the leaf nodes in the iframe DOM. This traversal skips leaf nodes
	 * inside an element with the wikiEditor-noinclude class. This basically wraps rawTraverser
	 *
	 * @param start Node to start at
	 * @return Traverser object, use .next() or .prev() to get a traverser object referring to the
	 *  previous/next node
	 */
	'traverser': function( start ) {
		// Find the leftmost leaf node in the tree
		var startNode = start.jquery ? start.get( 0 ) : start;
		var node = startNode;
		var inP = node.nodeName == "P" ? node : null;
		do {
			// Filter nodes with the wikiEditor-noinclude class
			// Don't use $( p ).hasClass( 'wikiEditor-noinclude' ) because
			// $() is slow in a tight loop
			while ( node && ( ' ' + node.className + ' ' ).indexOf( ' wikiEditor-noinclude ' ) != -1 ) {
				node = node.nextSibling;
			}
			if ( node && node.firstChild ) {
				node = node.firstChild;
				if ( node.nodeName == "P" ) {
					inP = node;
				}
			}
		} while ( node && node.firstChild );
		return new context.fn.rawTraverser( node, inP, startNode, true );
	},
	'getOffset': function( offset ) {
		if ( !context.offsets ) {
			context.fn.refreshOffsets();
		}
		if ( offset in context.offsets ) {
			return context.offsets[offset];
		}
		// Our offset is not pre-cached. Find the highest offset below it and interpolate
		// We need to traverse the entire object because for() doesn't traverse in order
		// We don't do in-order traversal because the object is sparse
		var lowerBound = -1;
		for ( var o in context.offsets ) {
			var realO = parseInt( o );
			if ( realO < offset && realO > lowerBound) {
				lowerBound = realO;
			}
		}
		if ( !( lowerBound in context.offsets ) ) {
			// Weird edge case: either offset is too large or the document is empty
			return null;
		}
		var base = context.offsets[lowerBound];
		return context.offsets[offset] = {
			'node': base.node,
			'offset': base.offset + offset - lowerBound,
			'length': base.length,
			'lastTextNode': base.lastTextNode
		};
	},
	'purgeOffsets': function() {
		context.offsets = null;
	},
	'refreshOffsets': function() {
		context.offsets = [ ];
		var t = context.fn.traverser( context.$content );
		var pos = 0, lastTextNode = null;
		while ( t ) {
			if ( t.node.nodeName != '#text' && t.node.nodeName != 'BR' ) {
				t = t.next();
				continue;
			}
			var nextPos = t.node.nodeName == '#text' ? pos + t.node.nodeValue.length : pos + 1;
			var nextT = t.next();
			var leavingP = t.node.nodeName == '#text' && t.inP && nextT && ( !nextT.inP || nextT.inP != t.inP );
			context.offsets[pos] = {
				'node': t.node,
				'offset': 0,
				'length': nextPos - pos + ( leavingP ? 1 : 0 ),
				'lastTextNode': lastTextNode
			};
			if ( leavingP ) {
				// <p>Foo</p> looks like "Foo\n", make it quack like it too
				// Basically we're faking the \n character much like we're treating <br>s
				context.offsets[nextPos] = {
					'node': t.node,
					'offset': nextPos - pos,
					'length': nextPos - pos + 1,
					'lastTextNode': lastTextNode
				};
			}
			pos = nextPos + ( leavingP ? 1 : 0 );
			if ( t.node.nodeName == '#text' ) {
				lastTextNode = t.node;
			}
			t = nextT;
		}
	},
	'saveCursorAndScrollTop': function() {
		// Stub out textarea behavior
		return;
	},
	'restoreCursorAndScrollTop': function() {
		// Stub out textarea behavior
		return;
	},
	'saveSelection': function() {
		if ( $.client.profile().name === 'msie' ) {
			context.$iframe[0].contentWindow.focus();
			context.savedSelection = context.$iframe[0].contentWindow.document.selection.createRange();
		}
	},
	'restoreSelection': function() {
		if ( $.client.profile().name === 'msie' && context.savedSelection !== null ) {
			context.$iframe[0].contentWindow.focus();
			context.savedSelection.select();
			context.savedSelection = null;
		}
	},
	/**
	 * Update the history queue
	 *
	 * @param htmlChange pass true or false to inidicate if there was a text change that should potentially
	 * 	be given a new history state.
	 */
	'updateHistory': function( htmlChange ) {
		var newHTML = context.$content.html();
		var newSel = context.fn.getCaretPosition();
		// Was text changed? Was it because of a REDO or UNDO action?
		if (
			context.history.length == 0 ||
			( htmlChange && context.oldDelayedHistoryPosition == context.historyPosition )
		) {
			context.oldDelayedSel = newSel;
			// Do we need to trim extras from our history?
			// FIXME: this should really be happing on change, not on the delay
			if ( context.historyPosition < -1 ) {
				//clear out the extras
				context.history.splice( context.history.length + context.historyPosition + 1 );
				context.historyPosition = -1;
			}
			context.history.push( { 'html': newHTML, 'sel': newSel } );
			// If the history has grown longer than 10 items, remove the earliest one
			while ( context.history.length > 10 ) {
				context.history.shift();
			}
		} else if ( context.oldDelayedSel != newSel ) {
			// If only the selection was changed, update it
			context.oldDelayedSel = newSel;
			context.history[context.history.length + context.historyPosition].sel = newSel;
		}
		// synch our old delayed history position until the next undo/redo action
		context.oldDelayedHistoryPosition = context.historyPosition;
	},
	/**
	 * Sets up the iframe in place of the textarea to allow more advanced operations
	 */
	'setupIframe': function() {
		context.$iframe = $( '<iframe></iframe>' )
			.attr( {
				'frameBorder': 0,
				'border': 0,
				'tabindex': 1,
				'src': mw.config.get( 'wgExtensionAssetsPath' ) + '/WikiEditor/modules/jquery.wikiEditor.html?' +
					'instance=' + context.instance + '&ts=' + ( new Date() ).getTime() + '&is=content',
				'id': 'wikiEditor-iframe-' + context.instance
			} )
			.css( {
				'backgroundColor': 'white',
				'width': '100%',
				'height': context.$textarea.height(),
				'display': 'none',
				'overflow-y': 'scroll',
				'overflow-x': 'hidden'
			} )
			.insertAfter( context.$textarea )
			.load( function() {
				// Internet Explorer will reload the iframe once we turn on design mode, so we need to only turn it
				// on during the first run, and then bail
				if ( !this.isSecondRun ) {
					// Turn the document's design mode on
					context.$iframe[0].contentWindow.document.designMode = 'on';
					// Let the rest of this function happen next time around
					if ( $.browser.msie ) {
						this.isSecondRun = true;
						return;
					}
				}
				// Get a reference to the content area of the iframe
				context.$content = $( context.$iframe[0].contentWindow.document.body );
				// Add classes to the body to influence the styles based on what's enabled
				for ( module in context.modules ) {
					context.$content.addClass( 'wikiEditor-' + module );
				}
				// If we just do "context.$content.text( context.$textarea.val() )", Internet Explorer will strip
				// out the whitespace charcters, specifically "\n" - so we must manually encode text and append it
				// TODO: Refactor this into a textToHtml() function
				var html = context.$textarea.val()
					// We're gonna use &esc; as an escape sequence
					.replace( /&esc;/g, '&esc;esc;' )
					// Escape existing uses of <p>, </p>, &nbsp; and <span class="wikiEditor-tab"></span>
					.replace( /\<p\>/g, '&esc;&lt;p&gt;' )
					.replace( /\<\/p\>/g, '&esc;&lt;/p&gt;' )
					.replace(
						/\<span class="wikiEditor-tab"\>\<\/span\>/g,
						'&esc;&lt;span&nbsp;class=&quot;wikiEditor-tab&quot;&gt;&lt;/span&gt;'
					)
					.replace( /&nbsp;/g, '&esc;&amp;nbsp;' );
				// We must do some extra processing on IE to avoid dirty diffs, specifically IE will collapse
				// leading spaces - browser sniffing is not ideal, but executing this code on a non-broken browser
				// doesn't cause harm
				if ( $.browser.msie ) {
					html = html.replace( /\t/g, '<span class="wikiEditor-tab"></span>' );
					if ( $.browser.versionNumber <= 7 ) {
						// Replace all spaces matching &nbsp; - IE <= 7 needs this because of its overzealous
						// whitespace collapsing
						html = html.replace( / /g, "&nbsp;" );
					} else {
						// IE8 is happy if we just convert the first leading space to &nbsp;
						html = html.replace( /(^|\n) /g, "$1&nbsp;" );
					}
				}
				// Use a dummy div to escape all entities
				// This'll also escape <br>, <span> and &nbsp; , so we unescape those after
				// We also need to unescape the doubly-escaped things mentioned above
				html = $( '<div />' ).text( '<p>' + html.replace( /\r?\n/g, '</p><p>' ) + '</p>' ).html()
					.replace( /&amp;nbsp;/g, '&nbsp;' )
					// Allow <p> tags to survive encoding
					.replace( /&lt;p&gt;/g, '<p>' )
					.replace( /&lt;\/p&gt;/g, '</p>' )
					// And <span class="wikiEditor-tab"></span> too
					.replace(
						/&lt;span( |&nbsp;)class=("|&quot;)wikiEditor-tab("|&quot;)&gt;&lt;\/span&gt;/g,
						'<span class="wikiEditor-tab"></span>'
					)
					// Empty <p> tags need <br> tags in them
					.replace( /<p><\/p>/g, '<p><br></p>' )
					// Unescape &esc; stuff
					.replace( /&amp;esc;&amp;amp;nbsp;/g, '&amp;nbsp;' )
					.replace( /&amp;esc;&amp;lt;p&amp;gt;/g, '&lt;p&gt;' )
					.replace( /&amp;esc;&amp;lt;\/p&amp;gt;/g, '&lt;/p&gt;' )
					.replace(
						/&amp;esc;&amp;lt;span&amp;nbsp;class=&amp;quot;wikiEditor-tab&amp;quot;&amp;gt;&amp;lt;\/span&amp;gt;/g,
						'&lt;span class="wikiEditor-tab"&gt;&lt;\/span&gt;'
					)
					.replace( /&amp;esc;esc;/g, '&amp;esc;' );
				context.$content.html( html );

				// Reflect direction of parent frame into child
				if ( $( 'body' ).is( '.rtl' ) ) {
					context.$content.addClass( 'rtl' ).attr( 'dir', 'rtl' );
				}
				// Activate the iframe, encoding the content of the textarea and copying it to the content of iframe
				context.$textarea.attr( 'disabled', true );
				context.$textarea.hide();
				context.$iframe.show();
				// Let modules know we're ready to start working with the content
				context.fn.trigger( 'ready' );
				// Only save HTML now: ready handlers may have modified it
				context.oldHTML = context.oldDelayedHTML = context.$content.html();
				//remove our temporary loading
				/* Disaling our loading div for now
				$( '.wikiEditor-ui-loading' ).fadeOut( 'fast', function() {
					$( this ).remove();
				} );
				*/
				// Setup event handling on the iframe
				$( context.$iframe[0].contentWindow.document )
					.bind( 'keydown', function( event ) {
						event.jQueryNode = context.fn.getElementAtCursor();
						return context.fn.trigger( 'keydown', event );

					} )
					.bind( 'keyup', function( event ) {
						event.jQueryNode = context.fn.getElementAtCursor();
						return context.fn.trigger( 'keyup', event );
					} )
					.bind( 'keypress', function( event ) {
						event.jQueryNode = context.fn.getElementAtCursor();
						return context.fn.trigger( 'keypress', event );
					} )
					.bind( 'paste', function( event ) {
						return context.fn.trigger( 'paste', event );
					} )
					.bind( 'cut', function( event ) {
						return context.fn.trigger( 'cut', event );
					} )
					.bind( 'keyup paste mouseup cut encapsulateSelection', function( event ) {
						return context.fn.trigger( 'change', event );
					} )
					.delayedBind( 250, 'keyup paste mouseup cut encapsulateSelection', function( event ) {
						context.fn.trigger( 'delayedChange', event );
					} );
			} );
		// Attach a submit handler to the form so that when the form is submitted the content of the iframe gets
		// decoded and copied over to the textarea
		context.$textarea.closest( 'form' ).submit( function() {
			context.$textarea.attr( 'disabled', false );
			context.$textarea.val( context.$textarea.textSelection( 'getContents' ) );
		} );
		/* FIXME: This was taken from EditWarning.js - maybe we could do a jquery plugin for this? */
		// Attach our own handler for onbeforeunload which respects the current one
		context.fallbackWindowOnBeforeUnload = window.onbeforeunload;
		window.onbeforeunload = function() {
			context.$textarea.val( context.$textarea.textSelection( 'getContents' ) );
			if ( context.fallbackWindowOnBeforeUnload ) {
				return context.fallbackWindowOnBeforeUnload();
			}
		};
	},

	/**
	 * Compatibility with the $.textSelection jQuery plug-in. When the iframe is in use, these functions provide
	 * equivilant functionality to the otherwise textarea-based functionality.
	 */

	'getElementAtCursor': function() {
		if ( context.$iframe[0].contentWindow.getSelection ) {
			// Firefox and Opera
			var selection = context.$iframe[0].contentWindow.getSelection();
			if ( selection.rangeCount == 0 ) {
				// We don't know where the cursor is
				return $( [] );
			}
			var sc = selection.getRangeAt( 0 ).startContainer;
			if ( sc.nodeName == "#text" ) sc = sc.parentNode;
			return $( sc );
		} else if ( context.$iframe[0].contentWindow.document.selection ) { // should come last; Opera!
			// IE
			var selection = context.$iframe[0].contentWindow.document.selection.createRange();
			return $( selection.parentElement() );
		}
	},

	/**
	 * Gets the complete contents of the iframe (in plain text, not HTML)
	 */
	'getContents': function() {
		// For <p></p>, .html() returns <p>&nbsp;</p> in IE
		// This seems to convince IE while not affecting display
		if ( !context.$content ) {
			return '';
		}
		var html;
		if ( $.browser.msie ) {
			// Don't manipulate the iframe DOM itself, causes cursor jumping issues
			var $c = $( context.$content.get( 0 ).cloneNode( true ) );
			$c.find( 'p' ).each( function() {
				if ( $(this).html() == '' ) {
					$(this).replaceWith( '<p></p>' );
				}
			} );
			html = $c.html();
		} else {
			html = context.$content.html();
		}
		return context.fn.htmlToText( html );
	},
	/**
	 * Gets the currently selected text in the content
	 * DO NOT CALL THIS DIRECTLY, use $.textSelection( 'functionname', options ) instead
	 */
	'getSelection': function() {
		var retval;
		if ( context.$iframe[0].contentWindow.getSelection ) {
			// Firefox and Opera
			retval = context.$iframe[0].contentWindow.getSelection();
			if ( $.browser.opera ) {
				// Opera strips newlines in getSelection(), so we need something more sophisticated
				if ( retval.rangeCount > 0 ) {
					retval = context.fn.htmlToText( $( '<pre />' )
							.append( retval.getRangeAt( 0 ).cloneContents() )
							.html()
					);
				} else {
					retval = '';
				}
			}
		} else if ( context.$iframe[0].contentWindow.document.selection ) { // should come last; Opera!
			// IE
			retval = context.$iframe[0].contentWindow.document.selection.createRange();
		}
		if ( typeof retval.text != 'undefined' ) {
			// In IE8, retval.text is stripped of newlines, so we need to process retval.htmlText
			// to get a reliable answer. IE7 does get this right though
			// Run this fix for all IE versions anyway, it doesn't hurt
			retval = context.fn.htmlToText( retval.htmlText );
		} else if ( typeof retval.toString != 'undefined' ) {
			retval = retval.toString();
		}
		return retval;
	},
	/**
	 * Inserts text at the begining and end of a text selection, optionally inserting text at the caret when
	 * selection is empty.
	 * DO NOT CALL THIS DIRECTLY, use $.textSelection( 'functionname', options ) instead
	 */
	'encapsulateSelection': function( options ) {
		var selText = $(this).textSelection( 'getSelection' );
		var selTextArr;
		var collapseToEnd = false;
		var selectAfter = false;
		var setSelectionTo = null;
		var pre = options.pre, post = options.post;
		if ( !selText ) {
			selText = options.peri;
			selectAfter = true;
		} else if ( options.peri == selText.replace( /\s+$/, '' ) ) {
			// Probably a successive button press
			// strip any extra white space from selText
			selText = selText.replace( /\s+$/, '' );
			// set the collapseToEnd flag to ensure our selection is collapsed to the end before any insertion is done
			collapseToEnd = true;
			// set selectAfter to true since we know we'll be populating with our default text
			selectAfter = true;
		} else if ( options.replace ) {
			selText = options.peri;
		} else if ( selText.charAt( selText.length - 1 ) == ' ' ) {
			// Exclude ending space char
			// FIXME: Why?
			selText = selText.substring( 0, selText.length - 1 );
			post += ' ';
		}
		if ( options.splitlines ) {
			selTextArr = selText.split( /\n/ );
		}

		if ( context.$iframe[0].contentWindow.getSelection ) {
			// Firefox and Opera
			var range = context.$iframe[0].contentWindow.getSelection().getRangeAt( 0 );
			// if our test above indicated that this was a sucessive button press, we need to collapse the
			// selection to the end to avoid replacing text
			if ( collapseToEnd ) {
				// Make sure we're not collapsing ourselves into a BR tag
				if ( range.endContainer.nodeName == 'BR' ) {
					range.setEndBefore( range.endContainer );
				}
				range.collapse( false );
			}
			if ( options.ownline ) {
				// We need to figure out if the cursor is at the start or end of a line
				var atStart = false, atEnd = false;
				var body = context.$content.get( 0 );
				if ( range.startOffset == 0 ) {
					// Start of a line
					// FIXME: Not necessarily the case with syntax highlighting or
					// template collapsing
					atStart = true;
				} else if ( range.startContainer == body ) {
					// Look up the node just before the start of the selection
					// If it's a <BR>, we're at the start of a line that starts with a
					// block element; if not, we're at the end of a line
					var n = body.firstChild;
					for ( var i = 0; i < range.startOffset - 1 && n; i++ ) {
						n = n.nextSibling;
					}
					if ( n && n.nodeName == 'BR' ) {
						atStart = true;
					} else {
						atEnd = true;
					}
				}
				if ( ( range.endOffset == 0 && range.endContainer.nodeValue == null ) ||
						( range.endContainer.nodeName == '#text' &&
								range.endOffset == range.endContainer.nodeValue.length ) ||
						( range.endContainer.nodeName == 'P' && range.endContainer.nodeValue == null ) ) {
					atEnd = true;
				}
				if ( !atStart ) {
					pre  = "\n" + options.pre;
				}
				if ( !atEnd ) {
					post += "\n";
				}
			}
			var insertText = "";
			if ( options.splitlines ) {
				for( var j = 0; j < selTextArr.length; j++ ) {
					insertText = insertText + pre + selTextArr[j] + post;
					if( j != selTextArr.length - 1 ) {
						insertText += "\n";
					}
				}
			} else {
				insertText = pre + selText + post;
			}
			var insertLines = insertText.split( "\n" );
			range.extractContents();
			// Insert the contents one line at a time - insertNode() inserts at the beginning, so this has to happen
			// in reverse order
			// Track the first and last inserted node, and if we need to also track where the text we need to select
			// afterwards starts and ends
			var firstNode = null, lastNode = null;
			var selSC = null, selEC = null, selSO = null, selEO = null, offset = 0;
			for ( var i = insertLines.length - 1; i >= 0; i-- ) {
				firstNode = context.$iframe[0].contentWindow.document.createTextNode( insertLines[i] );
				range.insertNode( firstNode );
				lastNode = lastNode || firstNode;
				var newOffset = offset + insertLines[i].length;
				if ( !selEC && post.length <= newOffset ) {
					selEC = firstNode;
					selEO = selEC.nodeValue.length - ( post.length - offset );
				}
				if ( selEC && !selSC && pre.length >= insertText.length - newOffset ) {
					selSC = firstNode;
					selSO = pre.length - ( insertText.length - newOffset );
				}
				offset = newOffset;
				if ( i > 0 ) {
					firstNode = context.$iframe[0].contentWindow.document.createElement( 'br' );
					range.insertNode( firstNode );
					newOffset = offset + 1;
					if ( !selEC && post.length <= newOffset ) {
						selEC = firstNode;
						selEO = 1 - ( post.length - offset );
					}
					if ( selEC && !selSC && pre.length >= insertText.length - newOffset ) {
						selSC = firstNode;
						selSO = pre.length - ( insertText.length - newOffset );
					}
					offset = newOffset;
				}
			}
			if ( firstNode ) {
				context.fn.scrollToTop( $( firstNode.parentNode ) );
			}
			if ( selectAfter ) {
				setSelectionTo = {
					startContainer: selSC,
					endContainer: selEC,
					start: selSO,
					end: selEO
				};
			} else if  ( lastNode ) {
				setSelectionTo = {
					startContainer: lastNode,
					endContainer: lastNode,
					start: lastNode.nodeValue.length,
					end: lastNode.nodeValue.length
				};
			}
		} else if ( context.$iframe[0].contentWindow.document.selection ) {
			// IE
			context.$iframe[0].contentWindow.focus();
			var range = context.$iframe[0].contentWindow.document.selection.createRange();
			if ( options.ownline && range.moveStart ) {
				// Check if we're at the start of a line
				// If not, prepend a newline
				var range2 = context.$iframe[0].contentWindow.document.selection.createRange();
				range2.collapse();
				range2.moveStart( 'character', -1 );
				// FIXME: Which check is correct?
				if ( range2.text != "\r" && range2.text != "\n" && range2.text != "" ) {
					pre = "\n" + pre;
				}

				// Check if we're at the end of a line
				// If not, append a newline
				var range3 = context.$iframe[0].contentWindow.document.selection.createRange();
				range3.collapse( false );
				range3.moveEnd( 'character', 1 );
				if ( range3.text != "\r" && range3.text != "\n" && range3.text != "" ) {
					post += "\n";
				}
			}
			// if our test above indicated that this was a sucessive button press, we need to collapse the
			// selection to the end to avoid replacing text
			if ( collapseToEnd ) {
				range.collapse( false );
			}
			// TODO: Clean this up. Duplicate code due to the pre-existing browser specific structure of this
			// function
			var insertText = "";
			if ( options.splitlines ) {
				for( var j = 0; j < selTextArr.length; j++ ) {
					insertText = insertText + pre + selTextArr[j] + post;
					if( j != selTextArr.length - 1 ) {
						insertText += "\n";
					}
				}
			} else {
				insertText = pre + selText + post;
			}
			// TODO: Maybe find a more elegant way of doing this like the Firefox code above?
			range.pasteHTML( insertText
					.replace( /\</g, '&lt;' )
					.replace( />/g, '&gt;' )
					.replace( /\r?\n/g, '<br />' )
			);
			if ( selectAfter ) {
				range.moveStart( 'character', -post.length - selText.length );
				range.moveEnd( 'character', -post.length );
				range.select();
			}
		}

		if ( setSelectionTo ) {
			context.fn.setSelection( setSelectionTo );
		}
		// Trigger the encapsulateSelection event (this might need to get named something else/done differently)
		$( context.$iframe[0].contentWindow.document ).trigger(
			'encapsulateSelection', [ pre, options.peri, post, options.ownline, options.replace ]
		);
		return context.$textarea;
	},
	/**
	 * Gets the position (in resolution of bytes not nessecarily characters) in a textarea
	 * DO NOT CALL THIS DIRECTLY, use $.textSelection( 'functionname', options ) instead
	 */
	'getCaretPosition': function( options ) {
		var startPos = null, endPos = null;
		if ( context.$iframe[0].contentWindow.getSelection ) {
			var selection = context.$iframe[0].contentWindow.getSelection();
			if ( selection.rangeCount == 0 ) {
				// We don't know where the cursor is
				return [ 0, 0 ];
			}
			var sc = selection.getRangeAt( 0 ).startContainer, ec = selection.getRangeAt( 0 ).endContainer;
			var so = selection.getRangeAt( 0 ).startOffset, eo = selection.getRangeAt( 0 ).endOffset;
			if ( sc.nodeName == 'BODY' ) {
				// Grab the node just before the start of the selection
				var n = sc.firstChild;
				for ( var i = 0; i < so - 1 && n; i++ ) {
					n = n.nextSibling;
				}
				sc = n;
				so = 0;
			}
			if ( ec.nodeName == 'BODY' ) {
				var n = ec.firstChild;
				for ( var i = 0; i < eo - 1 && n; i++ ) {
					n = n.nextSibling;
				}
				ec = n;
				eo = 0;
			}

			// Make sure sc and ec are leaf nodes
			while ( sc.firstChild ) {
				sc = sc.firstChild;
			}
			while ( ec.firstChild ) {
				ec = ec.firstChild;
			}
			// Make sure the offsets are regenerated if necessary
			context.fn.getOffset( 0 );
			var o;
			for ( o in context.offsets ) {
				if ( startPos === null && context.offsets[o].node == sc ) {
					// For some wicked reason o is a string, even though
					// we put it in as an integer. Use ~~ to coerce it too an int
					startPos = ~~o + so - context.offsets[o].offset;
				}
				if ( startPos !== null && context.offsets[o].node == ec ) {
					endPos = ~~o + eo - context.offsets[o].offset;
					break;
				}
			}
		} else if ( context.$iframe[0].contentWindow.document.selection ) {
			// IE
			// FIXME: This is mostly copypasted from the textSelection plugin
			var d = context.$iframe[0].contentWindow.document;
			var postFinished = false;
			var periFinished = false;
			var postFinished = false;
			var preText, rawPreText, periText;
			var rawPeriText, postText, rawPostText;
			// Depending on the document state, and if the cursor has ever been manually placed within the document
			// the following call such as setEndPoint can result in nasty errors. These cases are always cases
			// in which the start and end points can safely be assumed to be 0, so we will just try our best to do
			// the full process but fall back to 0.
			try {
				// Create range containing text in the selection
				var periRange = d.selection.createRange().duplicate();
				// Create range containing text before the selection
				var preRange = d.body.createTextRange();
				// Move the end where we need it
				preRange.setEndPoint( "EndToStart", periRange );
				// Create range containing text after the selection
				var postRange = d.body.createTextRange();
				// Move the start where we need it
				postRange.setEndPoint( "StartToEnd", periRange );
				// Load the text values we need to compare
				preText = rawPreText = preRange.text;
				periText = rawPeriText = periRange.text;
				postText = rawPostText = postRange.text;
				/*
				 * Check each range for trimmed newlines by shrinking the range by 1
				 * character and seeing if the text property has changed. If it has
				 * not changed then we know that IE has trimmed a \r\n from the end.
				 */
				do {
					if ( !postFinished ) {
						if ( preRange.compareEndPoints( "StartToEnd", preRange ) == 0 ) {
							postFinished = true;
						} else {
							preRange.moveEnd( "character", -1 );
							if ( preRange.text == preText ) {
								rawPreText += "\r\n";
							} else {
								postFinished = true;
							}
						}
					}
					if ( !periFinished ) {
						if ( periRange.compareEndPoints( "StartToEnd", periRange ) == 0 ) {
							periFinished = true;
						} else {
							periRange.moveEnd( "character", -1 );
							if ( periRange.text == periText ) {
								rawPeriText += "\r\n";
							} else {
								periFinished = true;
							}
						}
					}
					if ( !postFinished ) {
						if ( postRange.compareEndPoints("StartToEnd", postRange) == 0 ) {
							postFinished = true;
						} else {
							postRange.moveEnd( "character", -1 );
							if ( postRange.text == postText ) {
								rawPostText += "\r\n";
							} else {
								postFinished = true;
							}
						}
					}
				} while ( ( !postFinished || !periFinished || !postFinished ) );
				startPos = rawPreText.replace( /\r\n/g, "\n" ).length;
				endPos = startPos + rawPeriText.replace( /\r\n/g, "\n" ).length;
			} catch( e ) {
				startPos = endPos = 0;
			}
		}
		return [ startPos, endPos ];
	},
	/**
	 * Sets the selection of the content
	 * DO NOT CALL THIS DIRECTLY, use $.textSelection( 'functionname', options ) instead
	 *
	 * @param start Character offset of selection start
	 * @param end Character offset of selection end
	 * @param startContainer Element in iframe to start selection in. If not set, start is a character offset
	 * @param endContainer Element in iframe to end selection in. If not set, end is a character offset
	 */
	'setSelection': function( options ) {
		var sc = options.startContainer, ec = options.endContainer;
		sc = sc && sc.jquery ? sc[0] : sc;
		ec = ec && ec.jquery ? ec[0] : ec;
		if ( context.$iframe[0].contentWindow.getSelection ) {
			// Firefox and Opera
			var start = options.start, end = options.end;
			if ( !sc || !ec ) {
				var s = context.fn.getOffset( start );
				var e = context.fn.getOffset( end );
				sc = s ? s.node : null;
				ec = e ? e.node : null;
				start = s ? s.offset : null;
				end = e ? e.offset : null;
				// Don't try to set the selection past the end of a node, causes errors
				// Just put the selection at the end of the node in this case
				if ( sc != null && sc.nodeName == '#text' && start > sc.nodeValue.length ) {
					start = sc.nodeValue.length - 1;
				}
				if ( ec != null && ec.nodeName == '#text' && end > ec.nodeValue.length ) {
					end = ec.nodeValue.length - 1;
				}
			}
			if ( !sc || !ec ) {
				// The requested offset isn't in the offsets array
				// Give up
				return context.$textarea;
			}

			var sel = context.$iframe[0].contentWindow.getSelection();
			while ( sc.firstChild && sc.nodeName != '#text' ) {
				sc = sc.firstChild;
			}
			while ( ec.firstChild && ec.nodeName != '#text' ) {
				ec = ec.firstChild;
			}
			var range = context.$iframe[0].contentWindow.document.createRange();
			range.setStart( sc, start );
			range.setEnd( ec, end );
			sel.removeAllRanges();
			sel.addRange( range );
			context.$iframe[0].contentWindow.focus();
		} else if ( context.$iframe[0].contentWindow.document.body.createTextRange ) {
			// IE
			var range = context.$iframe[0].contentWindow.document.body.createTextRange();
			if ( sc ) {
				range.moveToElementText( sc );
			}
			range.collapse();
			range.moveEnd( 'character', options.start );

			var range2 = context.$iframe[0].contentWindow.document.body.createTextRange();
			if ( ec ) {
				range2.moveToElementText( ec );
			}
			range2.collapse();
			range2.moveEnd( 'character', options.end );

			// IE does newline emulation for <p>s: <p>foo</p><p>bar</p> becomes foo\nbar just fine
			// but <p>foo</p><br><br><p>bar</p> becomes foo\n\n\n\nbar , one \n too many
			// Correct for this
			var matches, counted = 0;
			// while ( matches = range.htmlText.match( regex ) && matches.length <= counted ) doesn't work
			// because the assignment side effect hasn't happened yet when the second term is evaluated
			while ( matches = range.htmlText.match( /\<\/p\>(\<br[^\>]*\>)+\<p\>/gi ) ) {
				if ( matches.length <= counted )
					break;
				range.moveEnd( 'character', matches.length );
				counted += matches.length;
			}
			range2.moveEnd( 'character', counted );
			while ( matches = range2.htmlText.match( /\<\/p\>(\<br[^\>]*\>)+\<p\>/gi ) ) {
				if ( matches.length <= counted )
					break;
				range2.moveEnd( 'character', matches.length );
				counted += matches.length;
			}

			range2.setEndPoint( 'StartToEnd', range );
			range2.select();
		}
		return context.$textarea;
	},
	/**
	 * Scroll a textarea to the current cursor position. You can set the cursor position with setSelection()
	 * DO NOT CALL THIS DIRECTLY, use $.textSelection( 'functionname', options ) instead
	 */
	'scrollToCaretPosition': function( options ) {
		context.fn.scrollToTop( context.fn.getElementAtCursor(), true );
	},
	/**
	 * Scroll an element to the top of the iframe
	 * DO NOT CALL THIS DIRECTLY, use $.textSelection( 'functionname', options ) instead
	 *
	 * @param $element jQuery object containing an element in the iframe
	 * @param force If true, scroll the element even if it's already visible
	 */
	'scrollToTop': function( $element, force ) {
		var html = context.$content.closest( 'html' ),
			body = context.$content.closest( 'body' ),
			parentHtml = $( 'html' ),
			parentBody = $( 'body' );
		var y = $element.offset().top;
		if ( !$.browser.msie && ! $element.is( 'body' ) ) {
			y = parentHtml.scrollTop() > 0 ? y + html.scrollTop() - parentHtml.scrollTop() : y;
			y = parentBody.scrollTop() > 0 ? y + body.scrollTop() - parentBody.scrollTop() : y;
		}
		var topBound = html.scrollTop() > body.scrollTop() ? html.scrollTop() : body.scrollTop(),
			bottomBound = topBound + context.$iframe.height();
		if ( force || y < topBound || y > bottomBound ) {
				html.scrollTop( y );
				body.scrollTop( y );
			}
		$element.trigger( 'scrollToTop' );
	}
} );

/* Setup the IFrame */
context.fn.setupIframe();

} } )( jQuery );