From c63493c899de714b05b0521bb38aab60d19030ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Isma=C3=ABl=20Bouya?= <ismael.bouya@normalesup.org>
Date: Fri, 20 Jan 2017 00:55:51 +0100
Subject: Validation initiale

---
 sources/core/style.js | 2102 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 2102 insertions(+)
 create mode 100644 sources/core/style.js

(limited to 'sources/core/style.js')

diff --git a/sources/core/style.js b/sources/core/style.js
new file mode 100644
index 0000000..efb9d7f
--- /dev/null
+++ b/sources/core/style.js
@@ -0,0 +1,2102 @@
+/**
+ * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or http://ckeditor.com/license
+ */
+
+'use strict';
+
+/**
+ * Block style type.
+ *
+ * Read more in the {@link CKEDITOR.style} class documentation.
+ *
+ * @readonly
+ * @property {Number} [=1]
+ * @member CKEDITOR
+ */
+CKEDITOR.STYLE_BLOCK = 1;
+
+/**
+ * Inline style type.
+ *
+ * Read more in the {@link CKEDITOR.style} class documentation.
+ *
+ * @readonly
+ * @property {Number} [=2]
+ * @member CKEDITOR
+ */
+CKEDITOR.STYLE_INLINE = 2;
+
+/**
+ * Object style type.
+ *
+ * Read more in the {@link CKEDITOR.style} class documentation.
+ *
+ * @readonly
+ * @property {Number} [=3]
+ * @member CKEDITOR
+ */
+CKEDITOR.STYLE_OBJECT = 3;
+
+( function() {
+	var blockElements = {
+			address: 1, div: 1, h1: 1, h2: 1, h3: 1, h4: 1, h5: 1, h6: 1, p: 1,
+			pre: 1, section: 1, header: 1, footer: 1, nav: 1, article: 1, aside: 1, figure: 1,
+			dialog: 1, hgroup: 1, time: 1, meter: 1, menu: 1, command: 1, keygen: 1, output: 1,
+			progress: 1, details: 1, datagrid: 1, datalist: 1
+		},
+
+		objectElements = {
+			a: 1, blockquote: 1, embed: 1, hr: 1, img: 1, li: 1, object: 1, ol: 1, table: 1, td: 1,
+			tr: 1, th: 1, ul: 1, dl: 1, dt: 1, dd: 1, form: 1, audio: 1, video: 1
+		};
+
+	var semicolonFixRegex = /\s*(?:;\s*|$)/,
+		varRegex = /#\((.+?)\)/g;
+
+	var notBookmark = CKEDITOR.dom.walker.bookmark( 0, 1 ),
+		nonWhitespaces = CKEDITOR.dom.walker.whitespaces( 1 );
+
+	/**
+	 * A class representing a style instance for the specific style definition.
+	 * In this approach, a style is a set of properties, like attributes and styles,
+	 * which can be applied to and removed from a {@link CKEDITOR.dom.selection selection} through
+	 * {@link CKEDITOR.editor editor} methods: {@link CKEDITOR.editor#applyStyle} and {@link CKEDITOR.editor#removeStyle},
+	 * respectively.
+	 *
+	 * Three default style types are available: {@link CKEDITOR#STYLE_BLOCK STYLE_BLOCK}, {@link CKEDITOR#STYLE_INLINE STYLE_INLINE},
+	 * and {@link CKEDITOR#STYLE_OBJECT STYLE_OBJECT}. Based on its type, a style heavily changes its behavior.
+	 * You can read more about style types in the [Style Types section of the Styles guide](#!/guide/dev_styles-section-style-types).
+	 *
+	 * It is possible to define a custom style type by subclassing this class by using the {@link #addCustomHandler} method.
+	 * However, because of great complexity of the styles handling job, it is only possible in very specific cases.
+	 *
+	 * ### Usage
+	 *
+	 * Basic usage:
+	 *
+	 *		// Define a block style.
+	 *		var style = new CKEDITOR.style( { element: 'h1' } );
+	 *
+	 *		// Considering the following selection:
+	 *		// <p>Foo</p><p>Bar^</p>
+	 *		// Executing:
+	 *		editor.applyStyle( style );
+	 *		// Will give:
+	 *		// <p>Foo</p><h1>Bar^</h1>
+	 *		style.checkActive( editor.elementPath(), editor ); // -> true
+	 *
+	 *		editor.removeStyle( style );
+	 *		// Will give:
+	 *		// <p>Foo</p><p>Bar^</p>
+	 *
+	 *		style.checkActive( editor.elementPath(), editor ); // -> false
+	 *
+	 * Object style:
+	 *
+	 *		// Define an object style.
+	 *		var style = new CKEDITOR.style( { element: 'img', attributes: { 'class': 'foo' } } );
+	 *
+	 *		// Considering the following selection:
+	 *		// <p><img src="bar.png" alt="" />Foo^</p>
+	 *		// Executing:
+	 *		editor.applyStyle( style );
+	 *		// Will not apply the style, because the image is not selected.
+	 *		// You can check if a style can be applied on the current selection with:
+	 *		style.checkApplicable( editor.elementPath(), editor ); // -> false
+	 *
+	 *		// Considering the following selection:
+	 *		// <p>[<img src="bar.png" alt="" />]Foo</p>
+	 *		// Executing
+	 *		editor.applyStyle( style );
+	 *		// Will give:
+	 *		// <p>[<img src="bar.png" alt="" class="foo" />]Foo</p>
+	 *
+	 * ### API changes introduced in CKEditor 4.4
+	 *
+	 * Before CKEditor 4.4 all style instances had no access at all to the {@link CKEDITOR.editor editor instance}
+	 * within which the style is used. Neither the style constructor, nor style methods were requiring
+	 * passing the editor instance which made styles independent of the editor and hence its settings and state.
+	 * This design decision came from CKEditor 3; it started causing problems and became an unsolvable obstacle for
+	 * the {@link CKEDITOR.style.customHandlers.widget widget style handler} which we introduced in CKEditor 4.4.
+	 *
+	 * There were two possible solutions. Passing an editor instance to the style constructor or to every method.
+	 * The first approach would be clean, however, having in mind the backward compatibility, we did not decide
+	 * to go for it. It would bind the style to one editor instance, making it unusable with other editor instances.
+	 * That could break many implementations reusing styles between editors. Therefore, we decided to take the longer
+	 * but safer path &mdash; the editor instance became an argument for nearly all style methods, however,
+	 * for backward compatibility reasons, all these methods will work without it. Even the newly
+	 * implemented {@link CKEDITOR.style.customHandlers.widget widget style handler}'s methods will not fail,
+	 * although they will also not work by aborting at an early stage.
+	 *
+	 * Therefore, you can safely upgrade to CKEditor 4.4 even if you use style methods without providing
+	 * the editor instance. You must only align your code if your implementation should handle widget styles
+	 * or any other custom style handler. Of course, we recommend doing this in any case to avoid potential
+	 * problems in the future.
+	 *
+	 * @class
+	 * @constructor Creates a style class instance.
+	 * @param styleDefinition
+	 * @param variablesValues
+	 */
+	CKEDITOR.style = function( styleDefinition, variablesValues ) {
+		if ( typeof styleDefinition.type == 'string' )
+			return new CKEDITOR.style.customHandlers[ styleDefinition.type ]( styleDefinition );
+
+		// Inline style text as attribute should be converted
+		// to styles object.
+		var attrs = styleDefinition.attributes;
+		if ( attrs && attrs.style ) {
+			styleDefinition.styles = CKEDITOR.tools.extend( {},
+				styleDefinition.styles, CKEDITOR.tools.parseCssText( attrs.style ) );
+			delete attrs.style;
+		}
+
+		if ( variablesValues ) {
+			styleDefinition = CKEDITOR.tools.clone( styleDefinition );
+
+			replaceVariables( styleDefinition.attributes, variablesValues );
+			replaceVariables( styleDefinition.styles, variablesValues );
+		}
+
+		var element = this.element = styleDefinition.element ?
+			(
+				typeof styleDefinition.element == 'string' ?
+					styleDefinition.element.toLowerCase() : styleDefinition.element
+			) : '*';
+
+		this.type = styleDefinition.type ||
+			(
+				blockElements[ element ] ? CKEDITOR.STYLE_BLOCK :
+				objectElements[ element ] ? CKEDITOR.STYLE_OBJECT :
+				CKEDITOR.STYLE_INLINE
+			);
+
+		// If the 'element' property is an object with a set of possible element, it will be applied like an object style: only to existing elements
+		if ( typeof this.element == 'object' )
+			this.type = CKEDITOR.STYLE_OBJECT;
+
+		this._ = {
+			definition: styleDefinition
+		};
+	};
+
+	CKEDITOR.style.prototype = {
+		/**
+		 * Applies the style on the editor's current selection.
+		 *
+		 * Before the style is applied, the method checks if the {@link #checkApplicable style is applicable}.
+		 *
+		 * **Note:** The recommended way of applying the style is by using the
+		 * {@link CKEDITOR.editor#applyStyle} method, which is a shorthand for this method.
+		 *
+		 * @param {CKEDITOR.editor/CKEDITOR.dom.document} editor The editor instance in which
+		 * the style will be applied.
+		 * A {@link CKEDITOR.dom.document} instance is accepted for backward compatibility
+		 * reasons, although since CKEditor 4.4 this type of argument is deprecated. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 */
+		apply: function( editor ) {
+			// Backward compatibility.
+			if ( editor instanceof CKEDITOR.dom.document )
+				return applyStyleOnSelection.call( this, editor.getSelection() );
+
+			if ( this.checkApplicable( editor.elementPath(), editor ) ) {
+				var initialEnterMode = this._.enterMode;
+
+				// See comment in removeStyle.
+				if ( !initialEnterMode )
+					this._.enterMode = editor.activeEnterMode;
+				applyStyleOnSelection.call( this, editor.getSelection(), 0, editor );
+				this._.enterMode = initialEnterMode;
+			}
+		},
+
+		/**
+		 * Removes the style from the editor's current selection.
+		 *
+		 * Before the style is applied, the method checks if {@link #checkApplicable style could be applied}.
+		 *
+		 * **Note:** The recommended way of removing the style is by using the
+		 * {@link CKEDITOR.editor#removeStyle} method, which is a shorthand for this method.
+		 *
+		 * @param {CKEDITOR.editor/CKEDITOR.dom.document} editor The editor instance in which
+		 * the style will be removed.
+		 * A {@link CKEDITOR.dom.document} instance is accepted for backward compatibility
+		 * reasons, although since CKEditor 4.4 this type of argument is deprecated. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 */
+		remove: function( editor ) {
+			// Backward compatibility.
+			if ( editor instanceof CKEDITOR.dom.document )
+				return applyStyleOnSelection.call( this, editor.getSelection(), 1 );
+
+			if ( this.checkApplicable( editor.elementPath(), editor ) ) {
+				var initialEnterMode = this._.enterMode;
+
+				// Before CKEditor 4.4 style knew nothing about editor, so in order to provide enterMode
+				// which should be used developers were forced to hack the style object (see #10190).
+				// Since CKEditor 4.4 style knows about editor (at least when it's being applied/removed), but we
+				// use _.enterMode for backward compatibility with those hacks.
+				// Note: we should not change style's enter mode if it was already set.
+				if ( !initialEnterMode )
+					this._.enterMode = editor.activeEnterMode;
+				applyStyleOnSelection.call( this, editor.getSelection(), 1, editor );
+				this._.enterMode = initialEnterMode;
+			}
+		},
+
+		/**
+		 * Applies the style on the provided range. Unlike {@link #apply} this
+		 * method does not take care of setting the selection, however, the range
+		 * is updated to the correct place.
+		 *
+		 * **Note:** If you want to apply the style on the editor selection,
+		 * you probably want to use {@link CKEDITOR.editor#applyStyle}.
+		 *
+		 * @param {CKEDITOR.dom.range} range
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features.  Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 */
+		applyToRange: function( range ) {
+			this.applyToRange =
+				this.type == CKEDITOR.STYLE_INLINE ? applyInlineStyle :
+				this.type == CKEDITOR.STYLE_BLOCK ? applyBlockStyle :
+				this.type == CKEDITOR.STYLE_OBJECT ? applyObjectStyle :
+				null;
+
+			return this.applyToRange( range );
+		},
+
+		/**
+		 * Removes the style from the provided range. Unlike {@link #remove} this
+		 * method does not take care of setting the selection, however, the range
+		 * is updated to the correct place.
+		 *
+		 * **Note:** If you want to remove the style from the editor selection,
+		 * you probably want to use {@link CKEDITOR.editor#removeStyle}.
+		 *
+		 * @param {CKEDITOR.dom.range} range
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 */
+		removeFromRange: function( range ) {
+			this.removeFromRange =
+				this.type == CKEDITOR.STYLE_INLINE ? removeInlineStyle :
+				this.type == CKEDITOR.STYLE_BLOCK ? removeBlockStyle :
+				this.type == CKEDITOR.STYLE_OBJECT ? removeObjectStyle :
+				null;
+
+			return this.removeFromRange( range );
+		},
+
+		/**
+		 * Applies the style to the element. This method bypasses all checks
+		 * and applies the style attributes directly on the provided element. Use with caution.
+		 *
+		 * See {@link CKEDITOR.editor#applyStyle}.
+		 *
+		 * @param {CKEDITOR.dom.element} element
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 */
+		applyToObject: function( element ) {
+			setupElement( element, this );
+		},
+
+		/**
+		 * Gets the style state inside the elements path.
+		 *
+		 * @param {CKEDITOR.dom.elementPath} elementPath
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 * @returns {Boolean} `true` if the element is active in the elements path.
+		 */
+		checkActive: function( elementPath, editor ) {
+			switch ( this.type ) {
+				case CKEDITOR.STYLE_BLOCK:
+					return this.checkElementRemovable( elementPath.block || elementPath.blockLimit, true, editor );
+
+				case CKEDITOR.STYLE_OBJECT:
+				case CKEDITOR.STYLE_INLINE:
+
+					var elements = elementPath.elements;
+
+					for ( var i = 0, element; i < elements.length; i++ ) {
+						element = elements[ i ];
+
+						if ( this.type == CKEDITOR.STYLE_INLINE && ( element == elementPath.block || element == elementPath.blockLimit ) )
+							continue;
+
+						if ( this.type == CKEDITOR.STYLE_OBJECT ) {
+							var name = element.getName();
+							if ( !( typeof this.element == 'string' ? name == this.element : name in this.element ) )
+								continue;
+						}
+
+						if ( this.checkElementRemovable( element, true, editor ) )
+							return true;
+					}
+			}
+			return false;
+		},
+
+		/**
+		 * Whether this style can be applied at the specified elements path.
+		 *
+		 * @param {CKEDITOR.dom.elementPath} elementPath The elements path to
+		 * check the style against.
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 * @param {CKEDITOR.filter} [filter] If defined, the style will be
+		 * checked against this filter as well.
+		 * @returns {Boolean} `true` if this style can be applied at the elements path.
+		 */
+		checkApplicable: function( elementPath, editor, filter ) {
+			// Backward compatibility.
+			if ( editor && editor instanceof CKEDITOR.filter )
+				filter = editor;
+
+			if ( filter && !filter.check( this ) )
+				return false;
+
+			switch ( this.type ) {
+				case CKEDITOR.STYLE_OBJECT:
+					return !!elementPath.contains( this.element );
+				case CKEDITOR.STYLE_BLOCK:
+					return !!elementPath.blockLimit.getDtd()[ this.element ];
+			}
+
+			return true;
+		},
+
+		/**
+		 * Checks if the element matches the current style definition.
+		 *
+		 * @param {CKEDITOR.dom.element} element
+		 * @param {Boolean} fullMatch
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 * @returns {Boolean}
+		 */
+		checkElementMatch: function( element, fullMatch ) {
+			var def = this._.definition;
+
+			if ( !element || !def.ignoreReadonly && element.isReadOnly() )
+				return false;
+
+			var attribs,
+				name = element.getName();
+
+			// If the element name is the same as the style name.
+			if ( typeof this.element == 'string' ? name == this.element : name in this.element ) {
+				// If no attributes are defined in the element.
+				if ( !fullMatch && !element.hasAttributes() )
+					return true;
+
+				attribs = getAttributesForComparison( def );
+
+				if ( attribs._length ) {
+					for ( var attName in attribs ) {
+						if ( attName == '_length' )
+							continue;
+
+						var elementAttr = element.getAttribute( attName ) || '';
+
+						// Special treatment for 'style' attribute is required.
+						if ( attName == 'style' ? compareCssText( attribs[ attName ], elementAttr ) : attribs[ attName ] == elementAttr ) {
+							if ( !fullMatch )
+								return true;
+						} else if ( fullMatch ) {
+							return false;
+						}
+					}
+					if ( fullMatch )
+						return true;
+				} else {
+					return true;
+				}
+			}
+
+			return false;
+		},
+
+		/**
+		 * Checks if an element, or any of its attributes, is removable by the
+		 * current style definition.
+		 *
+		 * @param {CKEDITOR.dom.element} element
+		 * @param {Boolean} fullMatch
+		 * @param {CKEDITOR.editor} editor The editor instance. Required argument since
+		 * CKEditor 4.4. The style system will work without it, but it is highly
+		 * recommended to provide it for integration with all features. Read more about
+		 * the signature change in the {@link CKEDITOR.style} documentation.
+		 * @returns {Boolean}
+		 */
+		checkElementRemovable: function( element, fullMatch, editor ) {
+			// Check element matches the style itself.
+			if ( this.checkElementMatch( element, fullMatch, editor ) )
+				return true;
+
+			// Check if the element matches the style overrides.
+			var override = getOverrides( this )[ element.getName() ];
+			if ( override ) {
+				var attribs, attName;
+
+				// If no attributes have been defined, remove the element.
+				if ( !( attribs = override.attributes ) )
+					return true;
+
+				for ( var i = 0; i < attribs.length; i++ ) {
+					attName = attribs[ i ][ 0 ];
+					var actualAttrValue = element.getAttribute( attName );
+					if ( actualAttrValue ) {
+						var attValue = attribs[ i ][ 1 ];
+
+						// Remove the attribute if:
+						//    - The override definition value is null;
+						//    - The override definition value is a string that
+						//      matches the attribute value exactly.
+						//    - The override definition value is a regex that
+						//      has matches in the attribute value.
+						if ( attValue === null )
+							return true;
+						if ( typeof attValue == 'string' ) {
+							if ( actualAttrValue == attValue )
+								return true;
+						} else if ( attValue.test( actualAttrValue ) ) {
+							return true;
+						}
+					}
+				}
+			}
+			return false;
+		},
+
+		/**
+		 * Builds the preview HTML based on the styles definition.
+		 *
+		 * @param {String} [label] The label used in the style preview.
+		 * @return {String} The HTML of preview.
+		 */
+		buildPreview: function( label ) {
+			var styleDefinition = this._.definition,
+				html = [],
+				elementName = styleDefinition.element;
+
+			// Avoid <bdo> in the preview.
+			if ( elementName == 'bdo' )
+				elementName = 'span';
+
+			html = [ '<', elementName ];
+
+			// Assign all defined attributes.
+			var attribs = styleDefinition.attributes;
+			if ( attribs ) {
+				for ( var att in attribs )
+					html.push( ' ', att, '="', attribs[ att ], '"' );
+			}
+
+			// Assign the style attribute.
+			var cssStyle = CKEDITOR.style.getStyleText( styleDefinition );
+			if ( cssStyle )
+				html.push( ' style="', cssStyle, '"' );
+
+			html.push( '>', ( label || styleDefinition.name ), '</', elementName, '>' );
+
+			return html.join( '' );
+		},
+
+		/**
+		 * Returns the style definition.
+		 *
+		 * @since 4.1
+		 * @returns {Object}
+		 */
+		getDefinition: function() {
+			return this._.definition;
+		}
+
+		/**
+		 * If defined (for example by {@link CKEDITOR.style#addCustomHandler custom style handler}), it returns
+		 * the {@link CKEDITOR.filter.allowedContentRules allowed content rules} which should be added to the
+		 * {@link CKEDITOR.filter} when enabling this style.
+		 *
+		 * **Note:** This method is not defined in the {@link CKEDITOR.style} class.
+		 *
+		 * @since 4.4
+		 * @method toAllowedContentRules
+		 * @param {CKEDITOR.editor} [editor] The editor instance.
+		 * @returns {CKEDITOR.filter.allowedContentRules} The rules that should represent this style in the {@link CKEDITOR.filter}.
+		 */
+	};
+
+	/**
+	 * Builds the inline style text based on the style definition.
+	 *
+	 * @static
+	 * @param styleDefinition
+	 * @returns {String} Inline style text.
+	 */
+	CKEDITOR.style.getStyleText = function( styleDefinition ) {
+		// If we have already computed it, just return it.
+		var stylesDef = styleDefinition._ST;
+		if ( stylesDef )
+			return stylesDef;
+
+		stylesDef = styleDefinition.styles;
+
+		// Builds the StyleText.
+		var stylesText = ( styleDefinition.attributes && styleDefinition.attributes.style ) || '',
+			specialStylesText = '';
+
+		if ( stylesText.length )
+			stylesText = stylesText.replace( semicolonFixRegex, ';' );
+
+		for ( var style in stylesDef ) {
+			var styleVal = stylesDef[ style ],
+				text = ( style + ':' + styleVal ).replace( semicolonFixRegex, ';' );
+
+			// Some browsers don't support 'inherit' property value, leave them intact. (#5242)
+			if ( styleVal == 'inherit' )
+				specialStylesText += text;
+			else
+				stylesText += text;
+		}
+
+		// Browsers make some changes to the style when applying them. So, here
+		// we normalize it to the browser format.
+		if ( stylesText.length )
+			stylesText = CKEDITOR.tools.normalizeCssText( stylesText, true );
+
+		stylesText += specialStylesText;
+
+		// Return it, saving it to the next request.
+		return ( styleDefinition._ST = stylesText );
+	};
+
+	/**
+	 * Namespace containing custom style handlers added with {@link CKEDITOR.style#addCustomHandler}.
+	 *
+	 * @since 4.4
+	 * @class
+	 * @singleton
+	 */
+	CKEDITOR.style.customHandlers = {};
+
+	/**
+	 * Creates a {@link CKEDITOR.style} subclass and registers it in the style system.
+	 * Registered class will be used as a handler for a style of this type. This allows
+	 * to extend the styles system, which by default uses only the {@link CKEDITOR.style}, with
+	 * new functionality. Registered classes are accessible in the {@link CKEDITOR.style.customHandlers}.
+	 *
+	 * ### The Style Class Definition
+	 *
+	 * The definition object is used to override properties in a prototype inherited
+	 * from the {@link CKEDITOR.style} class. It must contain a `type` property which is
+	 * a name of the new type and therefore it must be unique. The default style types
+	 * ({@link CKEDITOR#STYLE_BLOCK STYLE_BLOCK}, {@link CKEDITOR#STYLE_INLINE STYLE_INLINE},
+	 * and {@link CKEDITOR#STYLE_OBJECT STYLE_OBJECT}) are integers, but for easier identification
+	 * it is recommended to use strings as custom type names.
+	 *
+	 * Besides `type`, the definition may contain two more special properties:
+	 *
+	 *  * `setup {Function}` &ndash; An optional callback executed when a style instance is created.
+	 * Like the style constructor, it is executed in style context and with the style definition as an argument.
+	 *  * `assignedTo {Number}` &ndash; Can be set to one of the default style types. Some editor
+	 * features like the Styles drop-down assign styles to one of the default groups based on
+	 * the style type. By using this property it is possible to notify them to which group this
+	 * custom style should be assigned. It defaults to the {@link CKEDITOR#STYLE_OBJECT}.
+	 *
+	 * Other properties of the definition object will just be used to extend the prototype inherited
+	 * from the {@link CKEDITOR.style} class. So if the definition contains an `apply` method, it will
+	 * override the {@link CKEDITOR.style#apply} method.
+	 *
+	 * ### Usage
+	 *
+	 * Registering a basic handler:
+	 *
+	 *		var styleClass = CKEDITOR.style.addCustomHandler( {
+	 *			type: 'custom'
+	 *		} );
+	 *
+	 *		var style = new styleClass( { ... } );
+	 *		style instanceof styleClass; // -> true
+	 *		style instanceof CKEDITOR.style; // -> true
+	 *		style.type; // -> 'custom'
+	 *
+	 * The {@link CKEDITOR.style} constructor used as a factory:
+	 *
+	 *		var styleClass = CKEDITOR.style.addCustomHandler( {
+	 *			type: 'custom'
+	 *		} );
+	 *
+	 *		// Style constructor accepts style definition (do not confuse with style class definition).
+	 *		var style = new CKEDITOR.style( { type: 'custom', attributes: ... } );
+	 *		style instanceof styleClass; // -> true
+	 *
+	 * Thanks to that, integration code using styles does not need to know
+	 * which style handler it should use. It is determined by the {@link CKEDITOR.style} constructor.
+	 *
+	 * Overriding existing {@link CKEDITOR.style} methods:
+	 *
+	 *		var styleClass = CKEDITOR.style.addCustomHandler( {
+	 *			type: 'custom',
+	 *			apply: function( editor ) {
+	 *				console.log( 'apply' );
+	 *			},
+	 *			remove: function( editor ) {
+	 *				console.log( 'remove' );
+	 *			}
+	 *		} );
+	 *
+	 *		var style = new CKEDITOR.style( { type: 'custom', attributes: ... } );
+	 *		editor.applyStyle( style ); // logged 'apply'
+	 *
+	 *		style = new CKEDITOR.style( { element: 'img', attributes: { 'class': 'foo' } } );
+	 *		editor.applyStyle( style ); // style is really applied if image was selected
+	 *
+	 * ### Practical Recommendations
+	 *
+	 * The style handling job, which includes such tasks as applying, removing, checking state, and
+	 * checking if a style can be applied, is very complex. Therefore without deep knowledge
+	 * about DOM and especially {@link CKEDITOR.dom.range ranges} and {@link CKEDITOR.dom.walker DOM walker} it is impossible
+	 * to implement a completely custom style handler able to handle block, inline, and object type styles.
+	 * However, it is possible to customize the default implementation by overriding default methods and
+	 * reusing them.
+	 *
+	 * The only style handler which can be implemented from scratch without huge effort is a style
+	 * applicable to objects ([read more about types](http://docs.ckeditor.com/#!/guide/dev_styles-section-style-types)).
+	 * Such style can only be applied when a specific object is selected. An example implementation can
+	 * be found in the [widget plugin](https://github.com/ckeditor/ckeditor-dev/blob/master/plugins/widget/plugin.js).
+	 *
+	 * When implementing a style handler from scratch at least the following methods must be defined:
+	 *
+	 * * {@link CKEDITOR.style#apply apply} and {@link CKEDITOR.style#remove remove},
+	 * * {@link CKEDITOR.style#checkElementRemovable checkElementRemovable} and
+	 * {@link CKEDITOR.style#checkElementMatch checkElementMatch} &ndash; Note that both methods reuse the same logic,
+	 * * {@link CKEDITOR.style#checkActive checkActive} &ndash; Reuses
+	 * {@link CKEDITOR.style#checkElementMatch checkElementMatch},
+	 * * {@link CKEDITOR.style#toAllowedContentRules toAllowedContentRules} &ndash; Not required, but very useful in
+	 * case of a custom style that has to notify the {@link CKEDITOR.filter} which rules it allows when registered.
+	 *
+	 * @since 4.4
+	 * @static
+	 * @member CKEDITOR.style
+	 * @param definition The style class definition.
+	 * @returns {CKEDITOR.style} The new style class created for the provided definition.
+	 */
+	CKEDITOR.style.addCustomHandler = function( definition ) {
+		var styleClass = function( styleDefinition ) {
+			this._ = {
+				definition: styleDefinition
+			};
+
+			if ( this.setup )
+				this.setup( styleDefinition );
+		};
+
+		styleClass.prototype = CKEDITOR.tools.extend(
+			// Prototype of CKEDITOR.style.
+			CKEDITOR.tools.prototypedCopy( CKEDITOR.style.prototype ),
+			// Defaults.
+			{
+				assignedTo: CKEDITOR.STYLE_OBJECT
+			},
+			// Passed definition - overrides.
+			definition,
+			true
+		);
+
+		this.customHandlers[ definition.type ] = styleClass;
+
+		return styleClass;
+	};
+
+	// Gets the parent element which blocks the styling for an element. This
+	// can be done through read-only elements (contenteditable=false) or
+	// elements with the "data-nostyle" attribute.
+	function getUnstylableParent( element, root ) {
+		var unstylable, editable;
+
+		while ( ( element = element.getParent() ) ) {
+			if ( element.equals( root ) )
+				break;
+
+			if ( element.getAttribute( 'data-nostyle' ) )
+				unstylable = element;
+			else if ( !editable ) {
+				var contentEditable = element.getAttribute( 'contentEditable' );
+
+				if ( contentEditable == 'false' )
+					unstylable = element;
+				else if ( contentEditable == 'true' )
+					editable = 1;
+			}
+		}
+
+		return unstylable;
+	}
+
+	var posPrecedingIdenticalContained =
+			CKEDITOR.POSITION_PRECEDING | CKEDITOR.POSITION_IDENTICAL | CKEDITOR.POSITION_IS_CONTAINED,
+		posFollowingIdenticalContained =
+			CKEDITOR.POSITION_FOLLOWING | CKEDITOR.POSITION_IDENTICAL | CKEDITOR.POSITION_IS_CONTAINED;
+
+	// Checks if the current node can be a child of the style element.
+	function checkIfNodeCanBeChildOfStyle( def, currentNode, lastNode, nodeName, dtd, nodeIsNoStyle, nodeIsReadonly, includeReadonly ) {
+		// Style can be applied to text node.
+		if ( !nodeName )
+			return 1;
+
+		// Style definitely cannot be applied if DTD or data-nostyle do not allow.
+		if ( !dtd[ nodeName ] || nodeIsNoStyle  )
+			return 0;
+
+		// Non-editable element cannot be styled is we shouldn't include readonly elements.
+		if ( nodeIsReadonly && !includeReadonly  )
+			return 0;
+
+		// Check that we haven't passed lastNode yet and that style's childRule allows this style on current element.
+		return checkPositionAndRule( currentNode, lastNode, def, posPrecedingIdenticalContained );
+	}
+
+	// Check if the style element can be a child of the current
+	// node parent or if the element is not defined in the DTD.
+	function checkIfStyleCanBeChildOf( def, currentParent, elementName, isUnknownElement ) {
+		return currentParent &&
+			( ( currentParent.getDtd() || CKEDITOR.dtd.span )[ elementName ] || isUnknownElement ) &&
+			( !def.parentRule || def.parentRule( currentParent ) );
+	}
+
+	function checkIfStartsRange( nodeName, currentNode, lastNode ) {
+		return (
+			!nodeName || !CKEDITOR.dtd.$removeEmpty[ nodeName ] ||
+			( currentNode.getPosition( lastNode ) | posPrecedingIdenticalContained ) == posPrecedingIdenticalContained
+		);
+	}
+
+	function checkIfTextOrReadonlyOrEmptyElement( currentNode, nodeIsReadonly ) {
+		var nodeType = currentNode.type;
+		return nodeType == CKEDITOR.NODE_TEXT || nodeIsReadonly || ( nodeType == CKEDITOR.NODE_ELEMENT && !currentNode.getChildCount() );
+	}
+
+	// Checks if position is a subset of posBitFlags and that nodeA fulfills style def rule.
+	function checkPositionAndRule( nodeA, nodeB, def, posBitFlags ) {
+		return ( nodeA.getPosition( nodeB ) | posBitFlags ) == posBitFlags &&
+			( !def.childRule || def.childRule( nodeA ) );
+	}
+
+	function applyInlineStyle( range ) {
+		var document = range.document;
+
+		if ( range.collapsed ) {
+			// Create the element to be inserted in the DOM.
+			var collapsedElement = getElement( this, document );
+
+			// Insert the empty element into the DOM at the range position.
+			range.insertNode( collapsedElement );
+
+			// Place the selection right inside the empty element.
+			range.moveToPosition( collapsedElement, CKEDITOR.POSITION_BEFORE_END );
+
+			return;
+		}
+
+		var elementName = this.element,
+			def = this._.definition,
+			isUnknownElement;
+
+		// Indicates that fully selected read-only elements are to be included in the styling range.
+		var ignoreReadonly = def.ignoreReadonly,
+			includeReadonly = ignoreReadonly || def.includeReadonly;
+
+		// If the read-only inclusion is not available in the definition, try
+		// to get it from the root data (most often it's the editable).
+		if ( includeReadonly == null )
+			includeReadonly = range.root.getCustomData( 'cke_includeReadonly' );
+
+		// Get the DTD definition for the element. Defaults to "span".
+		var dtd = CKEDITOR.dtd[ elementName ];
+		if ( !dtd ) {
+			isUnknownElement = true;
+			dtd = CKEDITOR.dtd.span;
+		}
+
+		// Expand the range.
+		range.enlarge( CKEDITOR.ENLARGE_INLINE, 1 );
+		range.trim();
+
+		// Get the first node to be processed and the last, which concludes the processing.
+		var boundaryNodes = range.createBookmark(),
+			firstNode = boundaryNodes.startNode,
+			lastNode = boundaryNodes.endNode,
+			currentNode = firstNode,
+			styleRange;
+
+		if ( !ignoreReadonly ) {
+			// Check if the boundaries are inside non stylable elements.
+			var root = range.getCommonAncestor(),
+				firstUnstylable = getUnstylableParent( firstNode, root ),
+				lastUnstylable = getUnstylableParent( lastNode, root );
+
+			// If the first element can't be styled, we'll start processing right
+			// after its unstylable root.
+			if ( firstUnstylable )
+				currentNode = firstUnstylable.getNextSourceNode( true );
+
+			// If the last element can't be styled, we'll stop processing on its
+			// unstylable root.
+			if ( lastUnstylable )
+				lastNode = lastUnstylable;
+		}
+
+		// Do nothing if the current node now follows the last node to be processed.
+		if ( currentNode.getPosition( lastNode ) == CKEDITOR.POSITION_FOLLOWING )
+			currentNode = 0;
+
+		while ( currentNode ) {
+			var applyStyle = false;
+
+			if ( currentNode.equals( lastNode ) ) {
+				currentNode = null;
+				applyStyle = true;
+			} else {
+				var nodeName = currentNode.type == CKEDITOR.NODE_ELEMENT ? currentNode.getName() : null,
+					nodeIsReadonly = nodeName && ( currentNode.getAttribute( 'contentEditable' ) == 'false' ),
+					nodeIsNoStyle = nodeName && currentNode.getAttribute( 'data-nostyle' );
+
+				// Skip bookmarks.
+				if ( nodeName && currentNode.data( 'cke-bookmark' ) ) {
+					currentNode = currentNode.getNextSourceNode( true );
+					continue;
+				}
+
+				// Find all nested editables of a non-editable block and apply this style inside them.
+				if ( nodeIsReadonly && includeReadonly && CKEDITOR.dtd.$block[ nodeName ] )
+					applyStyleOnNestedEditables.call( this, currentNode );
+
+				// Check if the current node can be a child of the style element.
+				if ( checkIfNodeCanBeChildOfStyle( def, currentNode, lastNode, nodeName, dtd, nodeIsNoStyle, nodeIsReadonly, includeReadonly ) ) {
+					var currentParent = currentNode.getParent();
+
+					// Check if the style element can be a child of the current
+					// node parent or if the element is not defined in the DTD.
+					if ( checkIfStyleCanBeChildOf( def, currentParent, elementName, isUnknownElement ) ) {
+						// This node will be part of our range, so if it has not
+						// been started, place its start right before the node.
+						// In the case of an element node, it will be included
+						// only if it is entirely inside the range.
+						if ( !styleRange && checkIfStartsRange( nodeName, currentNode, lastNode ) ) {
+							styleRange = range.clone();
+							styleRange.setStartBefore( currentNode );
+						}
+
+						// Non element nodes, readonly elements, or empty
+						// elements can be added completely to the range.
+						if ( checkIfTextOrReadonlyOrEmptyElement( currentNode, nodeIsReadonly ) ) {
+							var includedNode = currentNode;
+							var parentNode;
+
+							// This node is about to be included completelly, but,
+							// if this is the last node in its parent, we must also
+							// check if the parent itself can be added completelly
+							// to the range, otherwise apply the style immediately.
+							while (
+								( applyStyle = !includedNode.getNext( notBookmark ) ) &&
+								( parentNode = includedNode.getParent(), dtd[ parentNode.getName() ] ) &&
+								checkPositionAndRule( parentNode, firstNode, def, posFollowingIdenticalContained )
+							) {
+								includedNode = parentNode;
+							}
+
+							styleRange.setEndAfter( includedNode );
+
+						}
+					} else {
+						applyStyle = true;
+					}
+				}
+				// Style isn't applicable to current element, so apply style to
+				// range ending at previously chosen position, or nowhere if we haven't
+				// yet started styleRange.
+				else {
+					applyStyle = true;
+				}
+
+				// Get the next node to be processed.
+				// If we're currently on a non-editable element or non-styleable element,
+				// then we'll be moved to current node's sibling (or even further), so we'll
+				// avoid messing up its content.
+				currentNode = currentNode.getNextSourceNode( nodeIsNoStyle || nodeIsReadonly );
+			}
+
+			// Apply the style if we have something to which apply it.
+			if ( applyStyle && styleRange && !styleRange.collapsed ) {
+				// Build the style element, based on the style object definition.
+				var styleNode = getElement( this, document ),
+					styleHasAttrs = styleNode.hasAttributes();
+
+				// Get the element that holds the entire range.
+				var parent = styleRange.getCommonAncestor();
+
+				var removeList = {
+					styles: {},
+					attrs: {},
+					// Styles cannot be removed.
+					blockedStyles: {},
+					// Attrs cannot be removed.
+					blockedAttrs: {}
+				};
+
+				var attName, styleName, value;
+
+				// Loop through the parents, removing the redundant attributes
+				// from the element to be applied.
+				while ( styleNode && parent ) {
+					if ( parent.getName() == elementName ) {
+						for ( attName in def.attributes ) {
+							if ( removeList.blockedAttrs[ attName ] || !( value = parent.getAttribute( styleName ) ) )
+								continue;
+
+							if ( styleNode.getAttribute( attName ) == value )
+								removeList.attrs[ attName ] = 1;
+							else
+								removeList.blockedAttrs[ attName ] = 1;
+						}
+
+						for ( styleName in def.styles ) {
+							if ( removeList.blockedStyles[ styleName ] || !( value = parent.getStyle( styleName ) ) )
+								continue;
+
+							if ( styleNode.getStyle( styleName ) == value )
+								removeList.styles[ styleName ] = 1;
+							else
+								removeList.blockedStyles[ styleName ] = 1;
+						}
+					}
+
+					parent = parent.getParent();
+				}
+
+				for ( attName in removeList.attrs )
+					styleNode.removeAttribute( attName );
+
+				for ( styleName in removeList.styles )
+					styleNode.removeStyle( styleName );
+
+				if ( styleHasAttrs && !styleNode.hasAttributes() )
+					styleNode = null;
+
+				if ( styleNode ) {
+					// Move the contents of the range to the style element.
+					styleRange.extractContents().appendTo( styleNode );
+
+					// Insert it into the range position (it is collapsed after
+					// extractContents.
+					styleRange.insertNode( styleNode );
+
+					// Here we do some cleanup, removing all duplicated
+					// elements from the style element.
+					removeFromInsideElement.call( this, styleNode );
+
+					// Let's merge our new style with its neighbors, if possible.
+					styleNode.mergeSiblings();
+
+					// As the style system breaks text nodes constantly, let's normalize
+					// things for performance.
+					// With IE, some paragraphs get broken when calling normalize()
+					// repeatedly. Also, for IE, we must normalize body, not documentElement.
+					// IE is also known for having a "crash effect" with normalize().
+					// We should try to normalize with IE too in some way, somewhere.
+					if ( !CKEDITOR.env.ie )
+						styleNode.$.normalize();
+				}
+				// Style already inherit from parents, left just to clear up any internal overrides. (#5931)
+				else {
+					styleNode = new CKEDITOR.dom.element( 'span' );
+					styleRange.extractContents().appendTo( styleNode );
+					styleRange.insertNode( styleNode );
+					removeFromInsideElement.call( this, styleNode );
+					styleNode.remove( true );
+				}
+
+				// Style applied, let's release the range, so it gets
+				// re-initialization in the next loop.
+				styleRange = null;
+			}
+		}
+
+		// Remove the bookmark nodes.
+		range.moveToBookmark( boundaryNodes );
+
+		// Minimize the result range to exclude empty text nodes. (#5374)
+		range.shrink( CKEDITOR.SHRINK_TEXT );
+
+		// Get inside the remaining element if range.shrink( TEXT ) has failed because of non-editable elements inside.
+		// E.g. range.shrink( TEXT ) will not get inside:
+		// [<b><i contenteditable="false">x</i></b>]
+		// but range.shrink( ELEMENT ) will.
+		range.shrink( CKEDITOR.NODE_ELEMENT, true );
+	}
+
+	function removeInlineStyle( range ) {
+		// Make sure our range has included all "collpased" parent inline nodes so
+		// that our operation logic can be simpler.
+		range.enlarge( CKEDITOR.ENLARGE_INLINE, 1 );
+
+		var bookmark = range.createBookmark(),
+			startNode = bookmark.startNode;
+
+		if ( range.collapsed ) {
+			var startPath = new CKEDITOR.dom.elementPath( startNode.getParent(), range.root ),
+				// The topmost element in elementspatch which we should jump out of.
+				boundaryElement;
+
+
+			for ( var i = 0, element; i < startPath.elements.length && ( element = startPath.elements[ i ] ); i++ ) {
+				// 1. If it's collaped inside text nodes, try to remove the style from the whole element.
+				//
+				// 2. Otherwise if it's collapsed on element boundaries, moving the selection
+				//  outside the styles instead of removing the whole tag,
+				//  also make sure other inner styles were well preserverd.(#3309)
+				if ( element == startPath.block || element == startPath.blockLimit )
+					break;
+
+				if ( this.checkElementRemovable( element ) ) {
+					var isStart;
+
+					if ( range.collapsed && ( range.checkBoundaryOfElement( element, CKEDITOR.END ) || ( isStart = range.checkBoundaryOfElement( element, CKEDITOR.START ) ) ) ) {
+						boundaryElement = element;
+						boundaryElement.match = isStart ? 'start' : 'end';
+					} else {
+						// Before removing the style node, there may be a sibling to the style node
+						// that's exactly the same to the one to be removed. To the user, it makes
+						// no difference that they're separate entities in the DOM tree. So, merge
+						// them before removal.
+						element.mergeSiblings();
+						if ( element.is( this.element ) )
+							removeFromElement.call( this, element );
+						else
+							removeOverrides( element, getOverrides( this )[ element.getName() ] );
+					}
+				}
+			}
+
+			// Re-create the style tree after/before the boundary element,
+			// the replication start from bookmark start node to define the
+			// new range.
+			if ( boundaryElement ) {
+				var clonedElement = startNode;
+				for ( i = 0; ; i++ ) {
+					var newElement = startPath.elements[ i ];
+					if ( newElement.equals( boundaryElement ) )
+						break;
+					// Avoid copying any matched element.
+					else if ( newElement.match )
+						continue;
+					else
+						newElement = newElement.clone();
+					newElement.append( clonedElement );
+					clonedElement = newElement;
+				}
+				clonedElement[ boundaryElement.match == 'start' ? 'insertBefore' : 'insertAfter' ]( boundaryElement );
+			}
+		} else {
+			// Now our range isn't collapsed. Lets walk from the start node to the end
+			// node via DFS and remove the styles one-by-one.
+			var endNode = bookmark.endNode,
+				me = this;
+
+			breakNodes();
+
+			// Now, do the DFS walk.
+			var currentNode = startNode;
+			while ( !currentNode.equals( endNode ) ) {
+				// Need to get the next node first because removeFromElement() can remove
+				// the current node from DOM tree.
+				var nextNode = currentNode.getNextSourceNode();
+				if ( currentNode.type == CKEDITOR.NODE_ELEMENT && this.checkElementRemovable( currentNode ) ) {
+					// Remove style from element or overriding element.
+					if ( currentNode.getName() == this.element )
+						removeFromElement.call( this, currentNode );
+					else
+						removeOverrides( currentNode, getOverrides( this )[ currentNode.getName() ] );
+
+					// removeFromElement() may have merged the next node with something before
+					// the startNode via mergeSiblings(). In that case, the nextNode would
+					// contain startNode and we'll have to call breakNodes() again and also
+					// reassign the nextNode to something after startNode.
+					if ( nextNode.type == CKEDITOR.NODE_ELEMENT && nextNode.contains( startNode ) ) {
+						breakNodes();
+						nextNode = startNode.getNext();
+					}
+				}
+				currentNode = nextNode;
+			}
+		}
+
+		range.moveToBookmark( bookmark );
+		// See the comment for range.shrink in applyInlineStyle.
+		range.shrink( CKEDITOR.NODE_ELEMENT, true );
+
+		// Find out the style ancestor that needs to be broken down at startNode
+		// and endNode.
+		function breakNodes() {
+			var startPath = new CKEDITOR.dom.elementPath( startNode.getParent() ),
+				endPath = new CKEDITOR.dom.elementPath( endNode.getParent() ),
+				breakStart = null,
+				breakEnd = null;
+
+			for ( var i = 0; i < startPath.elements.length; i++ ) {
+				var element = startPath.elements[ i ];
+
+				if ( element == startPath.block || element == startPath.blockLimit )
+					break;
+
+				if ( me.checkElementRemovable( element, true ) )
+					breakStart = element;
+			}
+
+			for ( i = 0; i < endPath.elements.length; i++ ) {
+				element = endPath.elements[ i ];
+
+				if ( element == endPath.block || element == endPath.blockLimit )
+					break;
+
+				if ( me.checkElementRemovable( element, true ) )
+					breakEnd = element;
+			}
+
+			if ( breakEnd )
+				endNode.breakParent( breakEnd );
+			if ( breakStart )
+				startNode.breakParent( breakStart );
+		}
+	}
+
+	// Apply style to nested editables inside editablesContainer.
+	// @param {CKEDITOR.dom.element} editablesContainer
+	// @context CKEDITOR.style
+	function applyStyleOnNestedEditables( editablesContainer ) {
+		var editables = findNestedEditables( editablesContainer ),
+			editable,
+			l = editables.length,
+			i = 0,
+			range = l && new CKEDITOR.dom.range( editablesContainer.getDocument() );
+
+		for ( ; i < l; ++i ) {
+			editable = editables[ i ];
+			// Check if style is allowed by this editable's ACF.
+			if ( checkIfAllowedInEditable( editable, this ) ) {
+				range.selectNodeContents( editable );
+				applyInlineStyle.call( this, range );
+			}
+		}
+	}
+
+	// Finds nested editables within container. Does not return
+	// editables nested in another editable (twice).
+	function findNestedEditables( container ) {
+		var editables = [];
+
+		container.forEach( function( element ) {
+			if ( element.getAttribute( 'contenteditable' ) == 'true' ) {
+				editables.push( element );
+				return false; // Skip children.
+			}
+		}, CKEDITOR.NODE_ELEMENT, true );
+
+		return editables;
+	}
+
+	// Checks if style is allowed in this editable.
+	function checkIfAllowedInEditable( editable, style ) {
+		var filter = CKEDITOR.filter.instances[ editable.data( 'cke-filter' ) ];
+
+		return filter ? filter.check( style ) : 1;
+	}
+
+	// Checks if style is allowed by iterator's active filter.
+	function checkIfAllowedByIterator( iterator, style ) {
+		return iterator.activeFilter ? iterator.activeFilter.check( style ) : 1;
+	}
+
+	function applyObjectStyle( range ) {
+		// Selected or parent element. (#9651)
+		var start = range.getEnclosedNode() || range.getCommonAncestor( false, true ),
+			element = new CKEDITOR.dom.elementPath( start, range.root ).contains( this.element, 1 );
+
+		element && !element.isReadOnly() && setupElement( element, this );
+	}
+
+	function removeObjectStyle( range ) {
+		var parent = range.getCommonAncestor( true, true ),
+			element = new CKEDITOR.dom.elementPath( parent, range.root ).contains( this.element, 1 );
+
+		if ( !element )
+			return;
+
+		var style = this,
+			def = style._.definition,
+			attributes = def.attributes;
+
+		// Remove all defined attributes.
+		if ( attributes ) {
+			for ( var att in attributes )
+				element.removeAttribute( att, attributes[ att ] );
+		}
+
+		// Assign all defined styles.
+		if ( def.styles ) {
+			for ( var i in def.styles ) {
+				if ( def.styles.hasOwnProperty( i ) )
+					element.removeStyle( i );
+			}
+		}
+	}
+
+	function applyBlockStyle( range ) {
+		// Serializible bookmarks is needed here since
+		// elements may be merged.
+		var bookmark = range.createBookmark( true );
+
+		var iterator = range.createIterator();
+		iterator.enforceRealBlocks = true;
+
+		// make recognize <br /> tag as a separator in ENTER_BR mode (#5121)
+		if ( this._.enterMode )
+			iterator.enlargeBr = ( this._.enterMode != CKEDITOR.ENTER_BR );
+
+		var block,
+			doc = range.document,
+			newBlock;
+
+		while ( ( block = iterator.getNextParagraph() ) ) {
+			if ( !block.isReadOnly() && checkIfAllowedByIterator( iterator, this ) ) {
+				newBlock = getElement( this, doc, block );
+				replaceBlock( block, newBlock );
+			}
+		}
+
+		range.moveToBookmark( bookmark );
+	}
+
+	function removeBlockStyle( range ) {
+		// Serializible bookmarks is needed here since
+		// elements may be merged.
+		var bookmark = range.createBookmark( 1 );
+
+		var iterator = range.createIterator();
+		iterator.enforceRealBlocks = true;
+		iterator.enlargeBr = this._.enterMode != CKEDITOR.ENTER_BR;
+
+		var block,
+			newBlock;
+
+		while ( ( block = iterator.getNextParagraph() ) ) {
+			if ( this.checkElementRemovable( block ) ) {
+				// <pre> get special treatment.
+				if ( block.is( 'pre' ) ) {
+					newBlock = this._.enterMode == CKEDITOR.ENTER_BR ? null :
+							range.document.createElement( this._.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' );
+
+					newBlock && block.copyAttributes( newBlock );
+					replaceBlock( block, newBlock );
+				} else {
+					removeFromElement.call( this, block );
+				}
+			}
+		}
+
+		range.moveToBookmark( bookmark );
+	}
+
+	// Replace the original block with new one, with special treatment
+	// for <pre> blocks to make sure content format is well preserved, and merging/splitting adjacent
+	// when necessary. (#3188)
+	function replaceBlock( block, newBlock ) {
+		// Block is to be removed, create a temp element to
+		// save contents.
+		var removeBlock = !newBlock;
+		if ( removeBlock ) {
+			newBlock = block.getDocument().createElement( 'div' );
+			block.copyAttributes( newBlock );
+		}
+
+		var newBlockIsPre = newBlock && newBlock.is( 'pre' ),
+			blockIsPre = block.is( 'pre' ),
+			isToPre = newBlockIsPre && !blockIsPre,
+			isFromPre = !newBlockIsPre && blockIsPre;
+
+		if ( isToPre )
+			newBlock = toPre( block, newBlock );
+		else if ( isFromPre )
+			// Split big <pre> into pieces before start to convert.
+			newBlock = fromPres( removeBlock ? [ block.getHtml() ] : splitIntoPres( block ), newBlock );
+		else
+			block.moveChildren( newBlock );
+
+		newBlock.replace( block );
+
+		if ( newBlockIsPre ) {
+			// Merge previous <pre> blocks.
+			mergePre( newBlock );
+		} else if ( removeBlock ) {
+			removeNoAttribsElement( newBlock );
+		}
+	}
+
+	// Merge a <pre> block with a previous sibling if available.
+	function mergePre( preBlock ) {
+		var previousBlock;
+		if ( !( ( previousBlock = preBlock.getPrevious( nonWhitespaces ) ) && previousBlock.type == CKEDITOR.NODE_ELEMENT && previousBlock.is( 'pre' ) ) )
+			return;
+
+		// Merge the previous <pre> block contents into the current <pre>
+		// block.
+		//
+		// Another thing to be careful here is that currentBlock might contain
+		// a '\n' at the beginning, and previousBlock might contain a '\n'
+		// towards the end. These new lines are not normally displayed but they
+		// become visible after merging.
+		var mergedHtml = replace( previousBlock.getHtml(), /\n$/, '' ) + '\n\n' +
+			replace( preBlock.getHtml(), /^\n/, '' );
+
+		// Krugle: IE normalizes innerHTML from <pre>, breaking whitespaces.
+		if ( CKEDITOR.env.ie )
+			preBlock.$.outerHTML = '<pre>' + mergedHtml + '</pre>';
+		else
+			preBlock.setHtml( mergedHtml );
+
+		previousBlock.remove();
+	}
+
+	// Split into multiple <pre> blocks separated by double line-break.
+	function splitIntoPres( preBlock ) {
+		// Exclude the ones at header OR at tail,
+		// and ignore bookmark content between them.
+		var duoBrRegex = /(\S\s*)\n(?:\s|(<span[^>]+data-cke-bookmark.*?\/span>))*\n(?!$)/gi,
+			pres = [],
+			splitedHtml = replace( preBlock.getOuterHtml(), duoBrRegex, function( match, charBefore, bookmark ) {
+				return charBefore + '</pre>' + bookmark + '<pre>';
+			} );
+
+		splitedHtml.replace( /<pre\b.*?>([\s\S]*?)<\/pre>/gi, function( match, preContent ) {
+			pres.push( preContent );
+		} );
+		return pres;
+	}
+
+	// Wrapper function of String::replace without considering of head/tail bookmarks nodes.
+	function replace( str, regexp, replacement ) {
+		var headBookmark = '',
+			tailBookmark = '';
+
+		str = str.replace( /(^<span[^>]+data-cke-bookmark.*?\/span>)|(<span[^>]+data-cke-bookmark.*?\/span>$)/gi, function( str, m1, m2 ) {
+			m1 && ( headBookmark = m1 );
+			m2 && ( tailBookmark = m2 );
+			return '';
+		} );
+		return headBookmark + str.replace( regexp, replacement ) + tailBookmark;
+	}
+
+	// Converting a list of <pre> into blocks with format well preserved.
+	function fromPres( preHtmls, newBlock ) {
+		var docFrag;
+		if ( preHtmls.length > 1 )
+			docFrag = new CKEDITOR.dom.documentFragment( newBlock.getDocument() );
+
+		for ( var i = 0; i < preHtmls.length; i++ ) {
+			var blockHtml = preHtmls[ i ];
+
+			// 1. Trim the first and last line-breaks immediately after and before <pre>,
+			// they're not visible.
+			blockHtml = blockHtml.replace( /(\r\n|\r)/g, '\n' );
+			blockHtml = replace( blockHtml, /^[ \t]*\n/, '' );
+			blockHtml = replace( blockHtml, /\n$/, '' );
+			// 2. Convert spaces or tabs at the beginning or at the end to &nbsp;
+			blockHtml = replace( blockHtml, /^[ \t]+|[ \t]+$/g, function( match, offset ) {
+				if ( match.length == 1 ) // one space, preserve it
+					return '&nbsp;';
+				else if ( !offset ) // beginning of block
+					return CKEDITOR.tools.repeat( '&nbsp;', match.length - 1 ) + ' ';
+				else // end of block
+					return ' ' + CKEDITOR.tools.repeat( '&nbsp;', match.length - 1 );
+			} );
+
+			// 3. Convert \n to <BR>.
+			// 4. Convert contiguous (i.e. non-singular) spaces or tabs to &nbsp;
+			blockHtml = blockHtml.replace( /\n/g, '<br>' );
+			blockHtml = blockHtml.replace( /[ \t]{2,}/g, function( match ) {
+				return CKEDITOR.tools.repeat( '&nbsp;', match.length - 1 ) + ' ';
+			} );
+
+			if ( docFrag ) {
+				var newBlockClone = newBlock.clone();
+				newBlockClone.setHtml( blockHtml );
+				docFrag.append( newBlockClone );
+			} else {
+				newBlock.setHtml( blockHtml );
+			}
+		}
+
+		return docFrag || newBlock;
+	}
+
+	// Converting from a non-PRE block to a PRE block in formatting operations.
+	function toPre( block, newBlock ) {
+		var bogus = block.getBogus();
+		bogus && bogus.remove();
+
+		// First trim the block content.
+		var preHtml = block.getHtml();
+
+		// 1. Trim head/tail spaces, they're not visible.
+		preHtml = replace( preHtml, /(?:^[ \t\n\r]+)|(?:[ \t\n\r]+$)/g, '' );
+		// 2. Delete ANSI whitespaces immediately before and after <BR> because
+		//    they are not visible.
+		preHtml = preHtml.replace( /[ \t\r\n]*(<br[^>]*>)[ \t\r\n]*/gi, '$1' );
+		// 3. Compress other ANSI whitespaces since they're only visible as one
+		//    single space previously.
+		// 4. Convert &nbsp; to spaces since &nbsp; is no longer needed in <PRE>.
+		preHtml = preHtml.replace( /([ \t\n\r]+|&nbsp;)/g, ' ' );
+		// 5. Convert any <BR /> to \n. This must not be done earlier because
+		//    the \n would then get compressed.
+		preHtml = preHtml.replace( /<br\b[^>]*>/gi, '\n' );
+
+		// Krugle: IE normalizes innerHTML to <pre>, breaking whitespaces.
+		if ( CKEDITOR.env.ie ) {
+			var temp = block.getDocument().createElement( 'div' );
+			temp.append( newBlock );
+			newBlock.$.outerHTML = '<pre>' + preHtml + '</pre>';
+			newBlock.copyAttributes( temp.getFirst() );
+			newBlock = temp.getFirst().remove();
+		} else {
+			newBlock.setHtml( preHtml );
+		}
+
+		return newBlock;
+	}
+
+	// Removes a style from an element itself, don't care about its subtree.
+	function removeFromElement( element, keepDataAttrs ) {
+		var def = this._.definition,
+			attributes = def.attributes,
+			styles = def.styles,
+			overrides = getOverrides( this )[ element.getName() ],
+			// If the style is only about the element itself, we have to remove the element.
+			removeEmpty = CKEDITOR.tools.isEmpty( attributes ) && CKEDITOR.tools.isEmpty( styles );
+
+		// Remove definition attributes/style from the elemnt.
+		for ( var attName in attributes ) {
+			// The 'class' element value must match (#1318).
+			if ( ( attName == 'class' || this._.definition.fullMatch ) && element.getAttribute( attName ) != normalizeProperty( attName, attributes[ attName ] ) )
+				continue;
+
+			// Do not touch data-* attributes (#11011) (#11258).
+			if ( keepDataAttrs && attName.slice( 0, 5 ) == 'data-' )
+				continue;
+
+			removeEmpty = element.hasAttribute( attName );
+			element.removeAttribute( attName );
+		}
+
+		for ( var styleName in styles ) {
+			// Full match style insist on having fully equivalence. (#5018)
+			if ( this._.definition.fullMatch && element.getStyle( styleName ) != normalizeProperty( styleName, styles[ styleName ], true ) )
+				continue;
+
+			removeEmpty = removeEmpty || !!element.getStyle( styleName );
+			element.removeStyle( styleName );
+		}
+
+		// Remove overrides, but don't remove the element if it's a block element
+		removeOverrides( element, overrides, blockElements[ element.getName() ] );
+
+		if ( removeEmpty ) {
+			if ( this._.definition.alwaysRemoveElement )
+				removeNoAttribsElement( element, 1 );
+			else {
+				if ( !CKEDITOR.dtd.$block[ element.getName() ] || this._.enterMode == CKEDITOR.ENTER_BR && !element.hasAttributes() )
+					removeNoAttribsElement( element );
+				else
+					element.renameNode( this._.enterMode == CKEDITOR.ENTER_P ? 'p' : 'div' );
+			}
+		}
+	}
+
+	// Removes a style from inside an element. Called on applyStyle to make cleanup
+	// before apply. During clean up this function keep data-* attribute in contrast
+	// to removeFromElement.
+	function removeFromInsideElement( element ) {
+		var overrides = getOverrides( this ),
+			innerElements = element.getElementsByTag( this.element ),
+			innerElement;
+
+		for ( var i = innerElements.count(); --i >= 0; ) {
+			innerElement = innerElements.getItem( i );
+
+			// Do not remove elements which are read only (e.g. duplicates inside widgets).
+			if ( !innerElement.isReadOnly() )
+				removeFromElement.call( this, innerElement, true );
+		}
+
+		// Now remove any other element with different name that is
+		// defined to be overriden.
+		for ( var overrideElement in overrides ) {
+			if ( overrideElement != this.element ) {
+				innerElements = element.getElementsByTag( overrideElement );
+
+				for ( i = innerElements.count() - 1; i >= 0; i-- ) {
+					innerElement = innerElements.getItem( i );
+
+					// Do not remove elements which are read only (e.g. duplicates inside widgets).
+					if ( !innerElement.isReadOnly() )
+						removeOverrides( innerElement, overrides[ overrideElement ] );
+				}
+			}
+		}
+	}
+
+	// Remove overriding styles/attributes from the specific element.
+	// Note: Remove the element if no attributes remain.
+	// @param {Object} element
+	// @param {Object} overrides
+	// @param {Boolean} Don't remove the element
+	function removeOverrides( element, overrides, dontRemove ) {
+		var attributes = overrides && overrides.attributes;
+
+		if ( attributes ) {
+			for ( var i = 0; i < attributes.length; i++ ) {
+				var attName = attributes[ i ][ 0 ],
+					actualAttrValue;
+
+				if ( ( actualAttrValue = element.getAttribute( attName ) ) ) {
+					var attValue = attributes[ i ][ 1 ];
+
+					// Remove the attribute if:
+					//    - The override definition value is null ;
+					//    - The override definition valie is a string that
+					//      matches the attribute value exactly.
+					//    - The override definition value is a regex that
+					//      has matches in the attribute value.
+					if ( attValue === null || ( attValue.test && attValue.test( actualAttrValue ) ) || ( typeof attValue == 'string' && actualAttrValue == attValue ) )
+						element.removeAttribute( attName );
+				}
+			}
+		}
+
+		if ( !dontRemove )
+			removeNoAttribsElement( element );
+	}
+
+	// If the element has no more attributes, remove it.
+	function removeNoAttribsElement( element, forceRemove ) {
+		// If no more attributes remained in the element, remove it,
+		// leaving its children.
+		if ( !element.hasAttributes() || forceRemove ) {
+			if ( CKEDITOR.dtd.$block[ element.getName() ] ) {
+				var previous = element.getPrevious( nonWhitespaces ),
+					next = element.getNext( nonWhitespaces );
+
+				if ( previous && ( previous.type == CKEDITOR.NODE_TEXT || !previous.isBlockBoundary( { br: 1 } ) ) )
+					element.append( 'br', 1 );
+				if ( next && ( next.type == CKEDITOR.NODE_TEXT || !next.isBlockBoundary( { br: 1 } ) ) )
+					element.append( 'br' );
+
+				element.remove( true );
+			} else {
+				// Removing elements may open points where merging is possible,
+				// so let's cache the first and last nodes for later checking.
+				var firstChild = element.getFirst();
+				var lastChild = element.getLast();
+
+				element.remove( true );
+
+				if ( firstChild ) {
+					// Check the cached nodes for merging.
+					firstChild.type == CKEDITOR.NODE_ELEMENT && firstChild.mergeSiblings();
+
+					if ( lastChild && !firstChild.equals( lastChild ) && lastChild.type == CKEDITOR.NODE_ELEMENT )
+						lastChild.mergeSiblings();
+				}
+
+			}
+		}
+	}
+
+	function getElement( style, targetDocument, element ) {
+		var el,
+			elementName = style.element;
+
+		// The "*" element name will always be a span for this function.
+		if ( elementName == '*' )
+			elementName = 'span';
+
+		// Create the element.
+		el = new CKEDITOR.dom.element( elementName, targetDocument );
+
+		// #6226: attributes should be copied before the new ones are applied
+		if ( element )
+			element.copyAttributes( el );
+
+		el = setupElement( el, style );
+
+		// Avoid ID duplication.
+		if ( targetDocument.getCustomData( 'doc_processing_style' ) && el.hasAttribute( 'id' ) )
+			el.removeAttribute( 'id' );
+		else
+			targetDocument.setCustomData( 'doc_processing_style', 1 );
+
+		return el;
+	}
+
+	function setupElement( el, style ) {
+		var def = style._.definition,
+			attributes = def.attributes,
+			styles = CKEDITOR.style.getStyleText( def );
+
+		// Assign all defined attributes.
+		if ( attributes ) {
+			for ( var att in attributes )
+				el.setAttribute( att, attributes[ att ] );
+		}
+
+		// Assign all defined styles.
+		if ( styles )
+			el.setAttribute( 'style', styles );
+
+		return el;
+	}
+
+	function replaceVariables( list, variablesValues ) {
+		for ( var item in list ) {
+			list[ item ] = list[ item ].replace( varRegex, function( match, varName ) {
+				return variablesValues[ varName ];
+			} );
+		}
+	}
+
+	// Returns an object that can be used for style matching comparison.
+	// Attributes names and values are all lowercased, and the styles get
+	// merged with the style attribute.
+	function getAttributesForComparison( styleDefinition ) {
+		// If we have already computed it, just return it.
+		var attribs = styleDefinition._AC;
+		if ( attribs )
+			return attribs;
+
+		attribs = {};
+
+		var length = 0;
+
+		// Loop through all defined attributes.
+		var styleAttribs = styleDefinition.attributes;
+		if ( styleAttribs ) {
+			for ( var styleAtt in styleAttribs ) {
+				length++;
+				attribs[ styleAtt ] = styleAttribs[ styleAtt ];
+			}
+		}
+
+		// Includes the style definitions.
+		var styleText = CKEDITOR.style.getStyleText( styleDefinition );
+		if ( styleText ) {
+			if ( !attribs.style )
+				length++;
+			attribs.style = styleText;
+		}
+
+		// Appends the "length" information to the object.
+		attribs._length = length;
+
+		// Return it, saving it to the next request.
+		return ( styleDefinition._AC = attribs );
+	}
+
+	// Get the the collection used to compare the elements and attributes,
+	// defined in this style overrides, with other element. All information in
+	// it is lowercased.
+	// @param {CKEDITOR.style} style
+	function getOverrides( style ) {
+		if ( style._.overrides )
+			return style._.overrides;
+
+		var overrides = ( style._.overrides = {} ),
+			definition = style._.definition.overrides;
+
+		if ( definition ) {
+			// The override description can be a string, object or array.
+			// Internally, well handle arrays only, so transform it if needed.
+			if ( !CKEDITOR.tools.isArray( definition ) )
+				definition = [ definition ];
+
+			// Loop through all override definitions.
+			for ( var i = 0; i < definition.length; i++ ) {
+				var override = definition[ i ],
+					elementName,
+					overrideEl,
+					attrs;
+
+				// If can be a string with the element name.
+				if ( typeof override == 'string' )
+					elementName = override.toLowerCase();
+				// Or an object.
+				else {
+					elementName = override.element ? override.element.toLowerCase() : style.element;
+					attrs = override.attributes;
+				}
+
+				// We can have more than one override definition for the same
+				// element name, so we attempt to simply append information to
+				// it if it already exists.
+				overrideEl = overrides[ elementName ] || ( overrides[ elementName ] = {} );
+
+				if ( attrs ) {
+					// The returning attributes list is an array, because we
+					// could have different override definitions for the same
+					// attribute name.
+					var overrideAttrs = ( overrideEl.attributes = overrideEl.attributes || [] );
+					for ( var attName in attrs ) {
+						// Each item in the attributes array is also an array,
+						// where [0] is the attribute name and [1] is the
+						// override value.
+						overrideAttrs.push( [ attName.toLowerCase(), attrs[ attName ] ] );
+					}
+				}
+			}
+		}
+
+		return overrides;
+	}
+
+	// Make the comparison of attribute value easier by standardizing it.
+	function normalizeProperty( name, value, isStyle ) {
+		var temp = new CKEDITOR.dom.element( 'span' );
+		temp[ isStyle ? 'setStyle' : 'setAttribute' ]( name, value );
+		return temp[ isStyle ? 'getStyle' : 'getAttribute' ]( name );
+	}
+
+	// Compare two bunch of styles, with the speciality that value 'inherit'
+	// is treated as a wildcard which will match any value.
+	// @param {Object/String} source
+	// @param {Object/String} target
+	// @returns {Boolean}
+	function compareCssText( source, target ) {
+		function filter( string, propertyName ) {
+			// In case of font-families we'll skip quotes. (#10750)
+			return propertyName.toLowerCase() == 'font-family' ? string.replace( /["']/g, '' ) : string;
+		}
+
+		if ( typeof source == 'string' )
+			source = CKEDITOR.tools.parseCssText( source );
+		if ( typeof target == 'string' )
+			target = CKEDITOR.tools.parseCssText( target, true );
+
+		for ( var name in source ) {
+			if ( !( name in target ) ) {
+				return false;
+			}
+
+			if ( !( filter( target[ name ], name ) == filter( source[ name ], name ) ||
+				source[ name ] == 'inherit' ||
+				target[ name ] == 'inherit' ) ) {
+				return false;
+			}
+		}
+		return true;
+	}
+
+	function applyStyleOnSelection( selection, remove, editor ) {
+		var doc = selection.document,
+			ranges = selection.getRanges(),
+			func = remove ? this.removeFromRange : this.applyToRange,
+			range;
+
+		var iterator = ranges.createIterator();
+		while ( ( range = iterator.getNextRange() ) )
+			func.call( this, range, editor );
+
+		selection.selectRanges( ranges );
+		doc.removeCustomData( 'doc_processing_style' );
+	}
+} )();
+
+/**
+ * Generic style command. It applies a specific style when executed.
+ *
+ *		var boldStyle = new CKEDITOR.style( { element: 'strong' } );
+ *		// Register the "bold" command, which applies the bold style.
+ *		editor.addCommand( 'bold', new CKEDITOR.styleCommand( boldStyle ) );
+ *
+ * @class
+ * @constructor Creates a styleCommand class instance.
+ * @extends CKEDITOR.commandDefinition
+ * @param {CKEDITOR.style} style The style to be applied when command is executed.
+ * @param {Object} [ext] Additional command definition's properties.
+ */
+CKEDITOR.styleCommand = function( style, ext ) {
+	this.style = style;
+	this.allowedContent = style;
+	this.requiredContent = style;
+
+	CKEDITOR.tools.extend( this, ext, true );
+};
+
+/**
+ * @param {CKEDITOR.editor} editor
+ * @todo
+ */
+CKEDITOR.styleCommand.prototype.exec = function( editor ) {
+	editor.focus();
+
+	if ( this.state == CKEDITOR.TRISTATE_OFF )
+		editor.applyStyle( this.style );
+	else if ( this.state == CKEDITOR.TRISTATE_ON )
+		editor.removeStyle( this.style );
+};
+
+/**
+ * Manages styles registration and loading. See also {@link CKEDITOR.config#stylesSet}.
+ *
+ *		// The set of styles for the <b>Styles</b> drop-down list.
+ *		CKEDITOR.stylesSet.add( 'default', [
+ *			// Block Styles
+ *			{ name: 'Blue Title',		element: 'h3',		styles: { 'color': 'Blue' } },
+ *			{ name: 'Red Title',		element: 'h3',		styles: { 'color': 'Red' } },
+ *
+ *			// Inline Styles
+ *			{ name: 'Marker: Yellow',	element: 'span',	styles: { 'background-color': 'Yellow' } },
+ *			{ name: 'Marker: Green',	element: 'span',	styles: { 'background-color': 'Lime' } },
+ *
+ *			// Object Styles
+ *			{
+ *				name: 'Image on Left',
+ *				element: 'img',
+ *				attributes: {
+ *					style: 'padding: 5px; margin-right: 5px',
+ *					border: '2',
+ *					align: 'left'
+ *				}
+ *			}
+ *		] );
+ *
+ * @since 3.2
+ * @class
+ * @singleton
+ * @extends CKEDITOR.resourceManager
+ */
+CKEDITOR.stylesSet = new CKEDITOR.resourceManager( '', 'stylesSet' );
+
+// Backward compatibility (#5025).
+CKEDITOR.addStylesSet = CKEDITOR.tools.bind( CKEDITOR.stylesSet.add, CKEDITOR.stylesSet );
+CKEDITOR.loadStylesSet = function( name, url, callback ) {
+	CKEDITOR.stylesSet.addExternal( name, url, '' );
+	CKEDITOR.stylesSet.load( name, callback );
+};
+
+CKEDITOR.tools.extend( CKEDITOR.editor.prototype, {
+	/**
+	 * Registers a function to be called whenever the selection position changes in the
+	 * editing area. The current state is passed to the function. The possible
+	 * states are {@link CKEDITOR#TRISTATE_ON} and {@link CKEDITOR#TRISTATE_OFF}.
+	 *
+	 *		// Create a style object for the <b> element.
+	 *		var style = new CKEDITOR.style( { element: 'b' } );
+	 *		var editor = CKEDITOR.instances.editor1;
+	 *		editor.attachStyleStateChange( style, function( state ) {
+	 *			if ( state == CKEDITOR.TRISTATE_ON )
+	 *				alert( 'The current state for the B element is ON' );
+	 *			else
+	 *				alert( 'The current state for the B element is OFF' );
+	 *		} );
+	 *
+	 * @member CKEDITOR.editor
+	 * @param {CKEDITOR.style} style The style to be watched.
+	 * @param {Function} callback The function to be called.
+	 */
+	attachStyleStateChange: function( style, callback ) {
+		// Try to get the list of attached callbacks.
+		var styleStateChangeCallbacks = this._.styleStateChangeCallbacks;
+
+		// If it doesn't exist, it means this is the first call. So, let's create
+		// all the structure to manage the style checks and the callback calls.
+		if ( !styleStateChangeCallbacks ) {
+			// Create the callbacks array.
+			styleStateChangeCallbacks = this._.styleStateChangeCallbacks = [];
+
+			// Attach to the selectionChange event, so we can check the styles at
+			// that point.
+			this.on( 'selectionChange', function( ev ) {
+				// Loop throw all registered callbacks.
+				for ( var i = 0; i < styleStateChangeCallbacks.length; i++ ) {
+					var callback = styleStateChangeCallbacks[ i ];
+
+					// Check the current state for the style defined for that callback.
+					var currentState = callback.style.checkActive( ev.data.path, this ) ?
+						CKEDITOR.TRISTATE_ON : CKEDITOR.TRISTATE_OFF;
+
+					// Call the callback function, passing the current state to it.
+					callback.fn.call( this, currentState );
+				}
+			} );
+		}
+
+		// Save the callback info, so it can be checked on the next occurrence of
+		// selectionChange.
+		styleStateChangeCallbacks.push( { style: style, fn: callback } );
+	},
+
+	/**
+	 * Applies the style upon the editor's current selection. Shorthand for
+	 * {@link CKEDITOR.style#apply}.
+	 *
+	 * @member CKEDITOR.editor
+	 * @param {CKEDITOR.style} style
+	 */
+	applyStyle: function( style ) {
+		style.apply( this );
+	},
+
+	/**
+	 * Removes the style from the editor's current selection. Shorthand for
+	 * {@link CKEDITOR.style#remove}.
+	 *
+	 * @member CKEDITOR.editor
+	 * @param {CKEDITOR.style} style
+	 */
+	removeStyle: function( style ) {
+		style.remove( this );
+	},
+
+	/**
+	 * Gets the current `stylesSet` for this instance.
+	 *
+	 *		editor.getStylesSet( function( stylesDefinitions ) {} );
+	 *
+	 * See also {@link CKEDITOR.editor#stylesSet} event.
+	 *
+	 * @member CKEDITOR.editor
+	 * @param {Function} callback The function to be called with the styles data.
+	 */
+	getStylesSet: function( callback ) {
+		if ( !this._.stylesDefinitions ) {
+			var editor = this,
+				// Respect the backwards compatible definition entry
+				configStyleSet = editor.config.stylesCombo_stylesSet || editor.config.stylesSet;
+
+			// The false value means that none styles should be loaded.
+			if ( configStyleSet === false ) {
+				callback( null );
+				return;
+			}
+
+			// #5352 Allow to define the styles directly in the config object
+			if ( configStyleSet instanceof Array ) {
+				editor._.stylesDefinitions = configStyleSet;
+				callback( configStyleSet );
+				return;
+			}
+
+			// Default value is 'default'.
+			if ( !configStyleSet )
+				configStyleSet = 'default';
+
+			var partsStylesSet = configStyleSet.split( ':' ),
+				styleSetName = partsStylesSet[ 0 ],
+				externalPath = partsStylesSet[ 1 ];
+
+			CKEDITOR.stylesSet.addExternal( styleSetName, externalPath ? partsStylesSet.slice( 1 ).join( ':' ) : CKEDITOR.getUrl( 'styles.js' ), '' );
+
+			CKEDITOR.stylesSet.load( styleSetName, function( stylesSet ) {
+				editor._.stylesDefinitions = stylesSet[ styleSetName ];
+				callback( editor._.stylesDefinitions );
+			} );
+		} else {
+			callback( this._.stylesDefinitions );
+		}
+	}
+} );
+
+/**
+ * Indicates that fully selected read-only elements will be included when
+ * applying the style (for inline styles only).
+ *
+ * @since 3.5
+ * @property {Boolean} [includeReadonly=false]
+ * @member CKEDITOR.style
+ */
+
+/**
+ * Indicates that any matches element of this style will be eventually removed
+ * when calling {@link CKEDITOR.editor#removeStyle}.
+ *
+ * @since 4.0
+ * @property {Boolean} [alwaysRemoveElement=false]
+ * @member CKEDITOR.style
+ */
+
+/**
+ * Disables inline styling on read-only elements.
+ *
+ * @since 3.5
+ * @cfg {Boolean} [disableReadonlyStyling=false]
+ * @member CKEDITOR.config
+ */
+
+/**
+ * The "styles definition set" to use in the editor. They will be used in the
+ * styles combo and the style selector of the div container.
+ *
+ * The styles may be defined in the page containing the editor, or can be
+ * loaded on demand from an external file. In the second case, if this setting
+ * contains only a name, the `styles.js` file will be loaded from the
+ * CKEditor root folder (what ensures backward compatibility with CKEditor 4.0).
+ *
+ * Otherwise, this setting has the `name:url` syntax, making it
+ * possible to set the URL from which the styles file will be loaded.
+ * Note that the `name` has to be equal to the name used in
+ * {@link CKEDITOR.stylesSet#add} while registering the styles set.
+ *
+ * **Note**: Since 4.1 it is possible to set `stylesSet` to `false`
+ * to prevent loading any styles set.
+ *
+ * Read more in the [documentation](#!/guide/dev_styles)
+ * and see the [SDK sample](http://sdk.ckeditor.com/samples/styles.html).
+ *
+ *		// Do not load any file. The styles set is empty.
+ *		config.stylesSet = false;
+ *
+ *		// Load the 'mystyles' styles set from the styles.js file.
+ *		config.stylesSet = 'mystyles';
+ *
+ *		// Load the 'mystyles' styles set from a relative URL.
+ *		config.stylesSet = 'mystyles:/editorstyles/styles.js';
+ *
+ *		// Load the 'mystyles' styles set from a full URL.
+ *		config.stylesSet = 'mystyles:http://www.example.com/editorstyles/styles.js';
+ *
+ *		// Load from a list of definitions.
+ *		config.stylesSet = [
+ *			{ name: 'Strong Emphasis', element: 'strong' },
+ *			{ name: 'Emphasis', element: 'em' },
+ *			...
+ *		];
+ *
+ * @since 3.3
+ * @cfg {String/Array/Boolean} [stylesSet='default']
+ * @member CKEDITOR.config
+ */
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