src/view/element.js
/**
* @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module engine/view/element
*/
import Node from './node';
import Text from './text';
import TextProxy from './textproxy';
import toMap from '@ckeditor/ckeditor5-utils/src/tomap';
import isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';
import Matcher from './matcher';
import StylesMap from './stylesmap';
// @if CK_DEBUG_ENGINE // const { convertMapToTags } = require( '../dev-utils/utils' );
/**
* View element.
*
* The editing engine does not define a fixed semantics of its elements (it is "DTD-free").
* This is why the type of the {@link module:engine/view/element~Element} need to
* be defined by the feature developer. When creating an element you should use one of the following methods:
*
* * {@link module:engine/view/downcastwriter~DowncastWriter#createContainerElement `downcastWriter#createContainerElement()`}
* in order to create a {@link module:engine/view/containerelement~ContainerElement},
* * {@link module:engine/view/downcastwriter~DowncastWriter#createAttributeElement `downcastWriter#createAttributeElement()`}
* in order to create a {@link module:engine/view/attributeelement~AttributeElement},
* * {@link module:engine/view/downcastwriter~DowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`}
* in order to create a {@link module:engine/view/emptyelement~EmptyElement}.
* * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`}
* in order to create a {@link module:engine/view/uielement~UIElement}.
* * {@link module:engine/view/downcastwriter~DowncastWriter#createEditableElement `downcastWriter#createEditableElement()`}
* in order to create a {@link module:engine/view/editableelement~EditableElement}.
*
* Note that for view elements which are not created from the model, like elements from mutations, paste or
* {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element.
* In such cases the {@link module:engine/view/upcastwriter~UpcastWriter#createElement `UpcastWriter#createElement()`} method
* should be used to create generic view elements.
*
* @extends module:engine/view/node~Node
*/
export default class Element extends Node {
/**
* Creates a view element.
*
* Attributes can be passed in various formats:
*
* new Element( viewDocument, 'div', { class: 'editor', contentEditable: 'true' } ); // object
* new Element( viewDocument, 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator
* new Element( viewDocument, 'div', mapOfAttributes ); // map
*
* @protected
* @param {module:engine/view/document~Document} document The document instance to which this element belongs.
* @param {String} name Node name.
* @param {Object|Iterable} [attrs] Collection of attributes.
* @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]
* A list of nodes to be inserted into created element.
*/
constructor( document, name, attrs, children ) {
super( document );
/**
* Name of the element.
*
* @readonly
* @member {String}
*/
this.name = name;
/**
* Map of attributes, where attributes names are keys and attributes values are values.
*
* @protected
* @member {Map} #_attrs
*/
this._attrs = parseAttributes( attrs );
/**
* Array of child nodes.
*
* @protected
* @member {Array.<module:engine/view/node~Node>}
*/
this._children = [];
if ( children ) {
this._insertChild( 0, children );
}
/**
* Set of classes associated with element instance.
*
* @protected
* @member {Set}
*/
this._classes = new Set();
if ( this._attrs.has( 'class' ) ) {
// Remove class attribute and handle it by class set.
const classString = this._attrs.get( 'class' );
parseClasses( this._classes, classString );
this._attrs.delete( 'class' );
}
/**
* Normalized styles.
*
* @protected
* @member {module:engine/view/stylesmap~StylesMap} module:engine/view/element~Element#_styles
*/
this._styles = new StylesMap( this.document.stylesProcessor );
if ( this._attrs.has( 'style' ) ) {
// Remove style attribute and handle it by styles map.
this._styles.setTo( this._attrs.get( 'style' ) );
this._attrs.delete( 'style' );
}
/**
* Map of custom properties.
* Custom properties can be added to element instance, will be cloned but not rendered into DOM.
*
* @protected
* @member {Map}
*/
this._customProperties = new Map();
}
/**
* Number of element's children.
*
* @readonly
* @type {Number}
*/
get childCount() {
return this._children.length;
}
/**
* Is `true` if there are no nodes inside this element, `false` otherwise.
*
* @readonly
* @type {Boolean}
*/
get isEmpty() {
return this._children.length === 0;
}
/**
* Checks whether this object is of the given.
*
* element.is( 'element' ); // -> true
* element.is( 'node' ); // -> true
* element.is( 'view:element' ); // -> true
* element.is( 'view:node' ); // -> true
*
* element.is( 'model:element' ); // -> false
* element.is( 'documentSelection' ); // -> false
*
* Assuming that the object being checked is an element, you can also check its
* {@link module:engine/view/element~Element#name name}:
*
* element.is( 'img' ); // -> true if this is an <img> element
* element.is( 'element', 'img' ); // -> same as above
* text.is( 'img' ); -> false
*
* {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.
*
* @param {String} type Type to check when `name` parameter is present.
* Otherwise, it acts like the `name` parameter.
* @param {String} [name] Element name.
* @returns {Boolean}
*/
is( type, name = null ) {
if ( !name ) {
return type === this.name || type === 'view:' + this.name ||
type === 'element' || type === 'view:element' ||
// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.
type === 'node' || type === 'view:node';
} else {
return name === this.name && ( type === 'element' || type === 'view:element' );
}
}
/**
* Gets child at the given index.
*
* @param {Number} index Index of child.
* @returns {module:engine/view/node~Node} Child node.
*/
getChild( index ) {
return this._children[ index ];
}
/**
* Gets index of the given child node. Returns `-1` if child node is not found.
*
* @param {module:engine/view/node~Node} node Child node.
* @returns {Number} Index of the child node.
*/
getChildIndex( node ) {
return this._children.indexOf( node );
}
/**
* Gets child nodes iterator.
*
* @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.
*/
getChildren() {
return this._children[ Symbol.iterator ]();
}
/**
* Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.
*
* @returns {Iterable.<String>} Keys for attributes.
*/
* getAttributeKeys() {
if ( this._classes.size > 0 ) {
yield 'class';
}
if ( !this._styles.isEmpty ) {
yield 'style';
}
yield* this._attrs.keys();
}
/**
* Returns iterator that iterates over this element's attributes.
*
* Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.
* This format is accepted by native `Map` object and also can be passed in `Node` constructor.
*
* @returns {Iterable.<*>}
*/
* getAttributes() {
yield* this._attrs.entries();
if ( this._classes.size > 0 ) {
yield [ 'class', this.getAttribute( 'class' ) ];
}
if ( !this._styles.isEmpty ) {
yield [ 'style', this.getAttribute( 'style' ) ];
}
}
/**
* Gets attribute by key. If attribute is not present - returns undefined.
*
* @param {String} key Attribute key.
* @returns {String|undefined} Attribute value.
*/
getAttribute( key ) {
if ( key == 'class' ) {
if ( this._classes.size > 0 ) {
return [ ...this._classes ].join( ' ' );
}
return undefined;
}
if ( key == 'style' ) {
const inlineStyle = this._styles.toString();
return inlineStyle == '' ? undefined : inlineStyle;
}
return this._attrs.get( key );
}
/**
* Returns a boolean indicating whether an attribute with the specified key exists in the element.
*
* @param {String} key Attribute key.
* @returns {Boolean} `true` if attribute with the specified key exists in the element, false otherwise.
*/
hasAttribute( key ) {
if ( key == 'class' ) {
return this._classes.size > 0;
}
if ( key == 'style' ) {
return !this._styles.isEmpty;
}
return this._attrs.has( key );
}
/**
* Checks if this element is similar to other element.
* Both elements should have the same name and attributes to be considered as similar. Two similar elements
* can contain different set of children nodes.
*
* @param {module:engine/view/element~Element} otherElement
* @returns {Boolean}
*/
isSimilar( otherElement ) {
if ( !( otherElement instanceof Element ) ) {
return false;
}
// If exactly the same Element is provided - return true immediately.
if ( this === otherElement ) {
return true;
}
// Check element name.
if ( this.name != otherElement.name ) {
return false;
}
// Check number of attributes, classes and styles.
if ( this._attrs.size !== otherElement._attrs.size || this._classes.size !== otherElement._classes.size ||
this._styles.size !== otherElement._styles.size ) {
return false;
}
// Check if attributes are the same.
for ( const [ key, value ] of this._attrs ) {
if ( !otherElement._attrs.has( key ) || otherElement._attrs.get( key ) !== value ) {
return false;
}
}
// Check if classes are the same.
for ( const className of this._classes ) {
if ( !otherElement._classes.has( className ) ) {
return false;
}
}
// Check if styles are the same.
for ( const property of this._styles.getStyleNames() ) {
if (
!otherElement._styles.has( property ) ||
otherElement._styles.getAsString( property ) !== this._styles.getAsString( property )
) {
return false;
}
}
return true;
}
/**
* Returns true if class is present.
* If more then one class is provided - returns true only when all classes are present.
*
* element.hasClass( 'foo' ); // Returns true if 'foo' class is present.
* element.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.
*
* @param {...String} className
*/
hasClass( ...className ) {
for ( const name of className ) {
if ( !this._classes.has( name ) ) {
return false;
}
}
return true;
}
/**
* Returns iterator that contains all class names.
*
* @returns {Iterable.<String>}
*/
getClassNames() {
return this._classes.keys();
}
/**
* Returns style value for the given property mae.
* If the style does not exist `undefined` is returned.
*
* **Note**: This method can work with normalized style names if
* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
* See {@link module:engine/view/stylesmap~StylesMap#getAsString `StylesMap#getAsString()`} for details.
*
* For an element with style set to `'margin:1px'`:
*
* // Enable 'margin' shorthand processing:
* editor.data.addStyleProcessorRules( addMarginRules );
*
* const element = view.change( writer => {
* const element = writer.createElement();
* writer.setStyle( 'margin', '1px' );
* writer.setStyle( 'margin-bottom', '3em' );
*
* return element;
* } );
*
* element.getStyle( 'margin' ); // -> 'margin: 1px 1px 3em;'
*
* @param {String} property
* @returns {String|undefined}
*/
getStyle( property ) {
return this._styles.getAsString( property );
}
/**
* Returns a normalized style object or single style value.
*
* For an element with style set to: margin:1px 2px 3em;
*
* element.getNormalizedStyle( 'margin' ) );
*
* will return:
*
* {
* top: '1px',
* right: '2px',
* bottom: '3em',
* left: '2px' // a normalized value from margin shorthand
* }
*
* and reading for single style value:
*
* styles.getNormalizedStyle( 'margin-left' );
*
* Will return a `2px` string.
*
* **Note**: This method will return normalized values only if
* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
* See {@link module:engine/view/stylesmap~StylesMap#getNormalized `StylesMap#getNormalized()`} for details.
*
*
* @param {String} property Name of CSS property
* @returns {Object|String|undefined}
*/
getNormalizedStyle( property ) {
return this._styles.getNormalized( property );
}
/**
* Returns iterator that contains all style names.
*
* @returns {Iterable.<String>}
*/
getStyleNames() {
return this._styles.getStyleNames();
}
/**
* Returns true if style keys are present.
* If more then one style property is provided - returns true only when all properties are present.
*
* element.hasStyle( 'color' ); // Returns true if 'border-top' style is present.
* element.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.
*
* @param {...String} property
*/
hasStyle( ...property ) {
for ( const name of property ) {
if ( !this._styles.has( name ) ) {
return false;
}
}
return true;
}
/**
* Returns ancestor element that match specified pattern.
* Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.
*
* @see module:engine/view/matcher~Matcher
* @param {Object|String|RegExp|Function} patterns Patterns used to match correct ancestor.
* See {@link module:engine/view/matcher~Matcher}.
* @returns {module:engine/view/element~Element|null} Found element or `null` if no matching ancestor was found.
*/
findAncestor( ...patterns ) {
const matcher = new Matcher( ...patterns );
let parent = this.parent;
while ( parent ) {
if ( matcher.match( parent ) ) {
return parent;
}
parent = parent.parent;
}
return null;
}
/**
* Returns the custom property value for the given key.
*
* @param {String|Symbol} key
* @returns {*}
*/
getCustomProperty( key ) {
return this._customProperties.get( key );
}
/**
* Returns an iterator which iterates over this element's custom properties.
* Iterator provides `[ key, value ]` pairs for each stored property.
*
* @returns {Iterable.<*>}
*/
* getCustomProperties() {
yield* this._customProperties.entries();
}
/**
* Returns identity string based on element's name, styles, classes and other attributes.
* Two elements that {@link #isSimilar are similar} will have same identity string.
* It has the following format:
*
* 'name class="class1,class2" style="style1:value1;style2:value2" attr1="val1" attr2="val2"'
*
* For example:
*
* const element = writer.createContainerElement( 'foo', {
* banana: '10',
* apple: '20',
* style: 'color: red; border-color: white;',
* class: 'baz'
* } );
*
* // returns 'foo class="baz" style="border-color:white;color:red" apple="20" banana="10"'
* element.getIdentity();
*
* **Note**: Classes, styles and other attributes are sorted alphabetically.
*
* @returns {String}
*/
getIdentity() {
const classes = Array.from( this._classes ).sort().join( ',' );
const styles = this._styles.toString();
const attributes = Array.from( this._attrs ).map( i => `${ i[ 0 ] }="${ i[ 1 ] }"` ).sort().join( ' ' );
return this.name +
( classes == '' ? '' : ` class="${ classes }"` ) +
( !styles ? '' : ` style="${ styles }"` ) +
( attributes == '' ? '' : ` ${ attributes }` );
}
/**
* Clones provided element.
*
* @protected
* @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,
* element will be cloned without any children.
* @returns {module:engine/view/element~Element} Clone of this element.
*/
_clone( deep = false ) {
const childrenClone = [];
if ( deep ) {
for ( const child of this.getChildren() ) {
childrenClone.push( child._clone( deep ) );
}
}
// ContainerElement and AttributeElement should be also cloned properly.
const cloned = new this.constructor( this.document, this.name, this._attrs, childrenClone );
// Classes and styles are cloned separately - this solution is faster than adding them back to attributes and
// parse once again in constructor.
cloned._classes = new Set( this._classes );
cloned._styles.set( this._styles.getNormalized() );
// Clone custom properties.
cloned._customProperties = new Map( this._customProperties );
// Clone filler offset method.
// We can't define this method in a prototype because it's behavior which
// is changed by e.g. toWidget() function from ckeditor5-widget. Perhaps this should be one of custom props.
cloned.getFillerOffset = this.getFillerOffset;
return cloned;
}
/**
* {@link module:engine/view/element~Element#_insertChild Insert} a child node or a list of child nodes at the end of this node
* and sets the parent of these nodes to this element.
*
* @see module:engine/view/downcastwriter~DowncastWriter#insert
* @protected
* @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.
* @fires module:engine/view/node~Node#change
* @returns {Number} Number of appended nodes.
*/
_appendChild( items ) {
return this._insertChild( this.childCount, items );
}
/**
* Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to
* this element.
*
* @see module:engine/view/downcastwriter~DowncastWriter#insert
* @protected
* @param {Number} index Position where nodes should be inserted.
* @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.
* @fires module:engine/view/node~Node#change
* @returns {Number} Number of inserted nodes.
*/
_insertChild( index, items ) {
this._fireChange( 'children', this );
let count = 0;
const nodes = normalize( this.document, items );
for ( const node of nodes ) {
// If node that is being added to this element is already inside another element, first remove it from the old parent.
if ( node.parent !== null ) {
node._remove();
}
node.parent = this;
node.document = this.document;
this._children.splice( index, 0, node );
index++;
count++;
}
return count;
}
/**
* Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.
*
* @see module:engine/view/downcastwriter~DowncastWriter#remove
* @protected
* @param {Number} index Number of the first node to remove.
* @param {Number} [howMany=1] Number of nodes to remove.
* @fires module:engine/view/node~Node#change
* @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.
*/
_removeChildren( index, howMany = 1 ) {
this._fireChange( 'children', this );
for ( let i = index; i < index + howMany; i++ ) {
this._children[ i ].parent = null;
}
return this._children.splice( index, howMany );
}
/**
* Adds or overwrite attribute with a specified key and value.
*
* @see module:engine/view/downcastwriter~DowncastWriter#setAttribute
* @protected
* @param {String} key Attribute key.
* @param {String} value Attribute value.
* @fires module:engine/view/node~Node#change
*/
_setAttribute( key, value ) {
value = String( value );
this._fireChange( 'attributes', this );
if ( key == 'class' ) {
parseClasses( this._classes, value );
} else if ( key == 'style' ) {
this._styles.setTo( value );
} else {
this._attrs.set( key, value );
}
}
/**
* Removes attribute from the element.
*
* @see module:engine/view/downcastwriter~DowncastWriter#removeAttribute
* @protected
* @param {String} key Attribute key.
* @returns {Boolean} Returns true if an attribute existed and has been removed.
* @fires module:engine/view/node~Node#change
*/
_removeAttribute( key ) {
this._fireChange( 'attributes', this );
// Remove class attribute.
if ( key == 'class' ) {
if ( this._classes.size > 0 ) {
this._classes.clear();
return true;
}
return false;
}
// Remove style attribute.
if ( key == 'style' ) {
if ( !this._styles.isEmpty ) {
this._styles.clear();
return true;
}
return false;
}
// Remove other attributes.
return this._attrs.delete( key );
}
/**
* Adds specified class.
*
* element._addClass( 'foo' ); // Adds 'foo' class.
* element._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.
*
* @see module:engine/view/downcastwriter~DowncastWriter#addClass
* @protected
* @param {Array.<String>|String} className
* @fires module:engine/view/node~Node#change
*/
_addClass( className ) {
this._fireChange( 'attributes', this );
className = Array.isArray( className ) ? className : [ className ];
className.forEach( name => this._classes.add( name ) );
}
/**
* Removes specified class.
*
* element._removeClass( 'foo' ); // Removes 'foo' class.
* element._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.
*
* @see module:engine/view/downcastwriter~DowncastWriter#removeClass
* @protected
* @param {Array.<String>|String} className
* @fires module:engine/view/node~Node#change
*/
_removeClass( className ) {
this._fireChange( 'attributes', this );
className = Array.isArray( className ) ? className : [ className ];
className.forEach( name => this._classes.delete( name ) );
}
/**
* Adds style to the element.
*
* element._setStyle( 'color', 'red' );
* element._setStyle( {
* color: 'red',
* position: 'fixed'
* } );
*
* **Note**: This method can work with normalized style names if
* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
* See {@link module:engine/view/stylesmap~StylesMap#set `StylesMap#set()`} for details.
*
* @see module:engine/view/downcastwriter~DowncastWriter#setStyle
* @protected
* @param {String|Object} property Property name or object with key - value pairs.
* @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.
* @fires module:engine/view/node~Node#change
*/
_setStyle( property, value ) {
this._fireChange( 'attributes', this );
this._styles.set( property, value );
}
/**
* Removes specified style.
*
* element._removeStyle( 'color' ); // Removes 'color' style.
* element._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.
*
* **Note**: This method can work with normalized style names if
* {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.
* See {@link module:engine/view/stylesmap~StylesMap#remove `StylesMap#remove()`} for details.
*
* @see module:engine/view/downcastwriter~DowncastWriter#removeStyle
* @protected
* @param {Array.<String>|String} property
* @fires module:engine/view/node~Node#change
*/
_removeStyle( property ) {
this._fireChange( 'attributes', this );
property = Array.isArray( property ) ? property : [ property ];
property.forEach( name => this._styles.remove( name ) );
}
/**
* Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,
* so they can be used to add special data to elements.
*
* @see module:engine/view/downcastwriter~DowncastWriter#setCustomProperty
* @protected
* @param {String|Symbol} key
* @param {*} value
*/
_setCustomProperty( key, value ) {
this._customProperties.set( key, value );
}
/**
* Removes the custom property stored under the given key.
*
* @see module:engine/view/downcastwriter~DowncastWriter#removeCustomProperty
* @protected
* @param {String|Symbol} key
* @returns {Boolean} Returns true if property was removed.
*/
_removeCustomProperty( key ) {
return this._customProperties.delete( key );
}
/**
* Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.
*
* @abstract
* @method module:engine/view/element~Element#getFillerOffset
*/
// @if CK_DEBUG_ENGINE // printTree( level = 0) {
// @if CK_DEBUG_ENGINE // let string = '';
// @if CK_DEBUG_ENGINE // string += '\t'.repeat( level ) + `<${ this.name }${ convertMapToTags( this.getAttributes() ) }>`;
// @if CK_DEBUG_ENGINE // for ( const child of this.getChildren() ) {
// @if CK_DEBUG_ENGINE // if ( child.is( 'text' ) ) {
// @if CK_DEBUG_ENGINE // string += '\n' + '\t'.repeat( level + 1 ) + child.data;
// @if CK_DEBUG_ENGINE // } else {
// @if CK_DEBUG_ENGINE // string += '\n' + child.printTree( level + 1 );
// @if CK_DEBUG_ENGINE // }
// @if CK_DEBUG_ENGINE // }
// @if CK_DEBUG_ENGINE // if ( this.childCount ) {
// @if CK_DEBUG_ENGINE // string += '\n' + '\t'.repeat( level );
// @if CK_DEBUG_ENGINE // }
// @if CK_DEBUG_ENGINE // string += `</${ this.name }>`;
// @if CK_DEBUG_ENGINE // return string;
// @if CK_DEBUG_ENGINE // }
// @if CK_DEBUG_ENGINE // logTree() {
// @if CK_DEBUG_ENGINE // console.log( this.printTree() );
// @if CK_DEBUG_ENGINE // }
}
// Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed
// as an object (instead of `Iterable`), the object is transformed to the map. Attributes with `null` value are removed.
// Attributes with non-`String` value are converted to `String`.
//
// @param {Object|Iterable} attrs Attributes to parse.
// @returns {Map} Parsed attributes.
function parseAttributes( attrs ) {
attrs = toMap( attrs );
for ( const [ key, value ] of attrs ) {
if ( value === null ) {
attrs.delete( key );
} else if ( typeof value != 'string' ) {
attrs.set( key, String( value ) );
}
}
return attrs;
}
// Parses class attribute and puts all classes into classes set.
// Classes set s cleared before insertion.
//
// @param {Set.<String>} classesSet Set to insert parsed classes.
// @param {String} classesString String with classes to parse.
function parseClasses( classesSet, classesString ) {
const classArray = classesString.split( /\s+/ );
classesSet.clear();
classArray.forEach( name => classesSet.add( name ) );
}
// Converts strings to Text and non-iterables to arrays.
//
// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}
// @returns {Iterable.<module:engine/view/node~Node>}
function normalize( document, nodes ) {
// Separate condition because string is iterable.
if ( typeof nodes == 'string' ) {
return [ new Text( document, nodes ) ];
}
if ( !isIterable( nodes ) ) {
nodes = [ nodes ];
}
// Array.from to enable .map() on non-arrays.
return Array.from( nodes )
.map( node => {
if ( typeof node == 'string' ) {
return new Text( document, node );
}
if ( node instanceof TextProxy ) {
return new Text( document, node.data );
}
return node;
} );
}