text: ﻿/*
  Copyright (c) 2003-2010, CKSource - Frederico Knabben. All rights reserved.
  For licensing, see LICENSE.html or http://ckeditor.com/license
  */
  
  (function()
  {
  	CKEDITOR.plugins.add( 'enterkey',
  	{
  		requires : [ 'keystrokes', 'indent' ],
  
  		init : function( editor )
  		{
  			var specialKeys = editor.specialKeys;
  			specialKeys[ 13 ] = enter;
  			specialKeys[ CKEDITOR.SHIFT + 13 ] = shiftEnter;
  		}
  	});
  
  	CKEDITOR.plugins.enterkey =
  	{
  		enterBlock : function( editor, mode, range, forceMode )
  		{
  			// Get the range for the current selection.
  			range = range || getRange( editor );
  
  			var doc = range.document;
  
  			// Exit the list when we're inside an empty list item block. (#5376)
  			if ( range.checkStartOfBlock() && range.checkEndOfBlock() )
  			{
  				var path = new CKEDITOR.dom.elementPath( range.startContainer ),
  						block = path.block;
  
  				if ( block.is( 'li' ) || block.getParent().is( 'li' ) )
  				{
  					editor.execCommand( 'outdent' );
  					return;
  				}
  			}
  
  			// Determine the block element to be used.
  			var blockTag = ( mode == CKEDITOR.ENTER_DIV ? 'div' : 'p' );
  
  			// Split the range.
  			var splitInfo = range.splitBlock( blockTag );
  
  			if ( !splitInfo )
  				return;
  
  			// Get the current blocks.
  			var previousBlock	= splitInfo.previousBlock,
  				nextBlock		= splitInfo.nextBlock;
  
  			var isStartOfBlock	= splitInfo.wasStartOfBlock,
  				isEndOfBlock	= splitInfo.wasEndOfBlock;
  
  			var node;
  
  			// If this is a block under a list item, split it as well. (#1647)
  			if ( nextBlock )
  			{
  				node = nextBlock.getParent();
  				if ( node.is( 'li' ) )
  				{
  					nextBlock.breakParent( node );
  					nextBlock.move( nextBlock.getNext(), true );
  				}
  			}
  			else if ( previousBlock && ( node = previousBlock.getParent() ) && node.is( 'li' ) )
  			{
  				previousBlock.breakParent( node );
  				range.moveToElementEditStart( previousBlock.getNext() );
  				previousBlock.move( previousBlock.getPrevious() );
  			}
  
  			// If we have both the previous and next blocks, it means that the
  			// boundaries were on separated blocks, or none of them where on the
  			// block limits (start/end).
  			if ( !isStartOfBlock && !isEndOfBlock )
  			{
  				// If the next block is an <li> with another list tree as the first
  				// child, we'll need to append a filler (<br>/NBSP) or the list item
  				// wouldn't be editable. (#1420)
  				if ( nextBlock.is( 'li' )
  					 && ( node = nextBlock.getFirst( CKEDITOR.dom.walker.invisible( true ) ) )
  					 && node.is && node.is( 'ul', 'ol' ) )
  					( CKEDITOR.env.ie ? doc.createText( '\xa0' ) : doc.createElement( 'br' ) ).insertBefore( node );
  
  				// Move the selection to the end block.
  				if ( nextBlock )
  					range.moveToElementEditStart( nextBlock );
  			}
  			else
  			{
  				var newBlock;
  
  				if ( previousBlock )
  				{
  					// Do not enter this block if it's a header tag, or we are in
  					// a Shift+Enter (#77). Create a new block element instead
  					// (later in the code).
  					if ( previousBlock.is( 'li' ) ||
  						 !( forceMode || headerTagRegex.test( previousBlock.getName() ) ) )
  					{
  						// Otherwise, duplicate the previous block.
  						newBlock = previousBlock.clone();
  					}
  				}
  				else if ( nextBlock )
  					newBlock = nextBlock.clone();
  
  				if ( !newBlock )
  					newBlock = doc.createElement( blockTag );
  
  				// Recreate the inline elements tree, which was available
  				// before hitting enter, so the same styles will be available in
  				// the new block.
  				var elementPath = splitInfo.elementPath;
  				if ( elementPath )
  				{
  					for ( var i = 0, len = elementPath.elements.length ; i < len ; i++ )
  					{
  						var element = elementPath.elements[ i ];
  
  						if ( element.equals( elementPath.block ) || element.equals( elementPath.blockLimit ) )
  							break;
  
  						if ( CKEDITOR.dtd.$removeEmpty[ element.getName() ] )
  						{
  							element = element.clone();
  							newBlock.moveChildren( element );
  							newBlock.append( element );
  						}
  					}
  				}
  
  				if ( !CKEDITOR.env.ie )
  					newBlock.appendBogus();
  
  				range.insertNode( newBlock );
  
  				// This is tricky, but to make the new block visible correctly
  				// we must select it.
  				// The previousBlock check has been included because it may be
  				// empty if we have fixed a block-less space (like ENTER into an
  				// empty table cell).
  				if ( CKEDITOR.env.ie && isStartOfBlock && ( !isEndOfBlock || !previousBlock.getChildCount() ) )
  				{
  					// Move the selection to the new block.
  					range.moveToElementEditStart( isEndOfBlock ? previousBlock : newBlock );
  					range.select();
  				}
  
  				// Move the selection to the new block.
  				range.moveToElementEditStart( isStartOfBlock && !isEndOfBlock ? nextBlock : newBlock );
  		}
  
  			if ( !CKEDITOR.env.ie )
  			{
  				if ( nextBlock )
  				{
  					// If we have split the block, adds a temporary span at the
  					// range position and scroll relatively to it.
  					var tmpNode = doc.createElement( 'span' );
  
  					// We need some content for Safari.
  					tmpNode.setHtml( '&nbsp;' );
  
  					range.insertNode( tmpNode );
  					tmpNode.scrollIntoView();
  					range.deleteContents();
  				}
  				else
  				{
  					// We may use the above scroll logic for the new block case
  					// too, but it gives some weird result with Opera.
  					newBlock.scrollIntoView();
  				}
  			}
  
  			range.select();
  		},
  
  		enterBr : function( editor, mode, range, forceMode )
  		{
  			// Get the range for the current selection.
  			range = range || getRange( editor );
  
  			var doc = range.document;
  
  			// Determine the block element to be used.
  			var blockTag = ( mode == CKEDITOR.ENTER_DIV ? 'div' : 'p' );
  
  			var isEndOfBlock = range.checkEndOfBlock();
  
  			var elementPath = new CKEDITOR.dom.elementPath( editor.getSelection().getStartElement() );
  
  			var startBlock = elementPath.block,
  				startBlockTag = startBlock && elementPath.block.getName();
  
  			var isPre = false;
  
  			if ( !forceMode && startBlockTag == 'li' )
  			{
  				enterBlock( editor, mode, range, forceMode );
  				return;
  			}
  
  			// If we are at the end of a header block.
  			if ( !forceMode && isEndOfBlock && headerTagRegex.test( startBlockTag ) )
  			{
  				// Insert a <br> after the current paragraph.
  				doc.createElement( 'br' ).insertAfter( startBlock );
  
  				// A text node is required by Gecko only to make the cursor blink.
  				if ( CKEDITOR.env.gecko )
  					doc.createText( '' ).insertAfter( startBlock );
  
  				// IE has different behaviors regarding position.
  				range.setStartAt( startBlock.getNext(), CKEDITOR.env.ie ? CKEDITOR.POSITION_BEFORE_START : CKEDITOR.POSITION_AFTER_START );
  			}
  			else
  			{
  				var lineBreak;
  
  				isPre = ( startBlockTag == 'pre' );
  
  				// Gecko prefers <br> as line-break inside <pre> (#4711).
  				if ( isPre && !CKEDITOR.env.gecko )
  					lineBreak = doc.createText( CKEDITOR.env.ie ? '\r' : '\n' );
  				else
  					lineBreak = doc.createElement( 'br' );
  
  				range.deleteContents();
  				range.insertNode( lineBreak );
  
  				// A text node is required by Gecko only to make the cursor blink.
  				// We need some text inside of it, so the bogus <br> is properly
  				// created.
  				if ( !CKEDITOR.env.ie )
  					doc.createText( '\ufeff' ).insertAfter( lineBreak );
  
  				// If we are at the end of a block, we must be sure the bogus node is available in that block.
  				if ( isEndOfBlock && !CKEDITOR.env.ie )
  					lineBreak.getParent().appendBogus();
  
  				// Now we can remove the text node contents, so the caret doesn't
  				// stop on it.
  				if ( !CKEDITOR.env.ie )
  					lineBreak.getNext().$.nodeValue = '';
  				// IE has different behavior regarding position.
  				if ( CKEDITOR.env.ie )
  					range.setStartAt( lineBreak, CKEDITOR.POSITION_AFTER_END );
  				else
  					range.setStartAt( lineBreak.getNext(), CKEDITOR.POSITION_AFTER_START );
  
  				// Scroll into view, for non IE.
  				if ( !CKEDITOR.env.ie )
  				{
  					var dummy = null;
  
  					// BR is not positioned in Opera and Webkit.
  					if ( !CKEDITOR.env.gecko )
  					{
  						dummy = doc.createElement( 'span' );
  						// We need have some contents for Webkit to position it
  						// under parent node. ( #3681)
  						dummy.setHtml('&nbsp;');
  					}
  					else
  						dummy = doc.createElement( 'br' );
  
  					dummy.insertBefore( lineBreak.getNext() );
  					dummy.scrollIntoView();
  					dummy.remove();
  				}
  			}
  
  			// This collapse guarantees the cursor will be blinking.
  			range.collapse( true );
  
  			range.select( isPre );
  		}
  	};
  
  	var plugin = CKEDITOR.plugins.enterkey,
  		enterBr = plugin.enterBr,
  		enterBlock = plugin.enterBlock,
  		headerTagRegex = /^h[1-6]$/;
  
  	function shiftEnter( editor )
  	{
  		// On SHIFT+ENTER we want to enforce the mode to be respected, instead
  		// of cloning the current block. (#77)
  		return enter( editor, editor.config.shiftEnterMode, true );
  	}
  
  	function enter( editor, mode, forceMode )
  	{
  		forceMode = editor.config.forceEnterMode || forceMode;
  
  		// Only effective within document.
  		if ( editor.mode != 'wysiwyg' )
  			return false;
  
  		if ( !mode )
  			mode = editor.config.enterMode;
  
  		// Use setTimout so the keys get cancelled immediatelly.
  		setTimeout( function()
  			{
  				editor.fire( 'saveSnapshot' );	// Save undo step.
  				if ( mode == CKEDITOR.ENTER_BR || editor.getSelection().getStartElement().hasAscendant( 'pre', true ) )
  					enterBr( editor, mode, null, forceMode );
  				else
  					enterBlock( editor, mode, null, forceMode );
  
  			}, 0 );
  
  		return true;
  	}
  
  
  	function getRange( editor )
  	{
  		// Get the selection ranges.
  		var ranges = editor.getSelection().getRanges();
  
  		// Delete the contents of all ranges except the first one.
  		for ( var i = ranges.length - 1 ; i > 0 ; i-- )
  		{
  			ranges[ i ].deleteContents();
  		}
  
  		// Return the first range.
  		return ranges[ 0 ];
  	}
  })();
  