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* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module engine/conversion/viewconsumable
*/
import { isArray } from 'lodash-es';
import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
/**
* Class used for handling consumption of view {@link module:engine/view/element~Element elements},
* {@link module:engine/view/text~Text text nodes} and {@link module:engine/view/documentfragment~DocumentFragment document fragments}.
* Element's name and its parts (attributes, classes and styles) can be consumed separately. Consuming an element's name
* does not consume its attributes, classes and styles.
* To add items for consumption use {@link module:engine/conversion/viewconsumable~ViewConsumable#add add method}.
* To test items use {@link module:engine/conversion/viewconsumable~ViewConsumable#test test method}.
* To consume items use {@link module:engine/conversion/viewconsumable~ViewConsumable#consume consume method}.
* To revert already consumed items use {@link module:engine/conversion/viewconsumable~ViewConsumable#revert revert method}.
*
* viewConsumable.add( element, { name: true } ); // Adds element's name as ready to be consumed.
* viewConsumable.add( textNode ); // Adds text node for consumption.
* viewConsumable.add( docFragment ); // Adds document fragment for consumption.
* viewConsumable.test( element, { name: true } ); // Tests if element's name can be consumed.
* viewConsumable.test( textNode ); // Tests if text node can be consumed.
* viewConsumable.test( docFragment ); // Tests if document fragment can be consumed.
* viewConsumable.consume( element, { name: true } ); // Consume element's name.
* viewConsumable.consume( textNode ); // Consume text node.
* viewConsumable.consume( docFragment ); // Consume document fragment.
* viewConsumable.revert( element, { name: true } ); // Revert already consumed element's name.
* viewConsumable.revert( textNode ); // Revert already consumed text node.
* viewConsumable.revert( docFragment ); // Revert already consumed document fragment.
*/
export default class ViewConsumable {
/**
* Creates new ViewConsumable.
*/
constructor() {
/**
* Map of consumable elements. If {@link module:engine/view/element~Element element} is used as a key,
* {@link module:engine/conversion/viewconsumable~ViewElementConsumables ViewElementConsumables} instance is stored as value.
* For {@link module:engine/view/text~Text text nodes} and
* {@link module:engine/view/documentfragment~DocumentFragment document fragments} boolean value is stored as value.
*
* @protected
* @member {Map.<module:engine/conversion/viewconsumable~ViewElementConsumables|Boolean>}
*/
this._consumables = new Map();
}
/**
* Adds {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or
* {@link module:engine/view/documentfragment~DocumentFragment document fragment} as ready to be consumed.
*
* viewConsumable.add( p, { name: true } ); // Adds element's name to consume.
* viewConsumable.add( p, { attributes: 'name' } ); // Adds element's attribute.
* viewConsumable.add( p, { classes: 'foobar' } ); // Adds element's class.
* viewConsumable.add( p, { styles: 'color' } ); // Adds element's style
* viewConsumable.add( p, { attributes: 'name', styles: 'color' } ); // Adds attribute and style.
* viewConsumable.add( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be provided.
* viewConsumable.add( textNode ); // Adds text node to consume.
* viewConsumable.add( docFragment ); // Adds document fragment to consume.
*
* Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`
* attribute is provided - it should be handled separately by providing actual style/class.
*
* viewConsumable.add( p, { attributes: 'style' } ); // This call will throw an exception.
* viewConsumable.add( p, { styles: 'color' } ); // This is properly handled style.
*
* @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element
* @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.
* @param {Boolean} consumables.name If set to true element's name will be included.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.
* @param {String|Array.<String>} consumables.classes Class name or array of class names.
* @param {String|Array.<String>} consumables.styles Style name or array of style names.
*/
add( element, consumables ) {
let elementConsumables;
// For text nodes and document fragments just mark them as consumable.
if ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {
this._consumables.set( element, true );
return;
}
// For elements create new ViewElementConsumables or update already existing one.
if ( !this._consumables.has( element ) ) {
elementConsumables = new ViewElementConsumables( element );
this._consumables.set( element, elementConsumables );
} else {
elementConsumables = this._consumables.get( element );
}
elementConsumables.add( consumables );
}
/**
* Tests if {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or
* {@link module:engine/view/documentfragment~DocumentFragment document fragment} can be consumed.
* It returns `true` when all items included in method's call can be consumed. Returns `false` when
* first already consumed item is found and `null` when first non-consumable item is found.
*
* viewConsumable.test( p, { name: true } ); // Tests element's name.
* viewConsumable.test( p, { attributes: 'name' } ); // Tests attribute.
* viewConsumable.test( p, { classes: 'foobar' } ); // Tests class.
* viewConsumable.test( p, { styles: 'color' } ); // Tests style.
* viewConsumable.test( p, { attributes: 'name', styles: 'color' } ); // Tests attribute and style.
* viewConsumable.test( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be tested.
* viewConsumable.test( textNode ); // Tests text node.
* viewConsumable.test( docFragment ); // Tests document fragment.
*
* Testing classes and styles as attribute will test if all added classes/styles can be consumed.
*
* viewConsumable.test( p, { attributes: 'class' } ); // Tests if all added classes can be consumed.
* viewConsumable.test( p, { attributes: 'style' } ); // Tests if all added styles can be consumed.
*
* @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element
* @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.
* @param {Boolean} consumables.name If set to true element's name will be included.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.
* @param {String|Array.<String>} consumables.classes Class name or array of class names.
* @param {String|Array.<String>} consumables.styles Style name or array of style names.
* @returns {Boolean|null} Returns `true` when all items included in method's call can be consumed. Returns `false`
* when first already consumed item is found and `null` when first non-consumable item is found.
*/
test( element, consumables ) {
const elementConsumables = this._consumables.get( element );
if ( elementConsumables === undefined ) {
return null;
}
// For text nodes and document fragments return stored boolean value.
if ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {
return elementConsumables;
}
// For elements test consumables object.
return elementConsumables.test( consumables );
}
/**
* Consumes {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or
* {@link module:engine/view/documentfragment~DocumentFragment document fragment}.
* It returns `true` when all items included in method's call can be consumed, otherwise returns `false`.
*
* viewConsumable.consume( p, { name: true } ); // Consumes element's name.
* viewConsumable.consume( p, { attributes: 'name' } ); // Consumes element's attribute.
* viewConsumable.consume( p, { classes: 'foobar' } ); // Consumes element's class.
* viewConsumable.consume( p, { styles: 'color' } ); // Consumes element's style.
* viewConsumable.consume( p, { attributes: 'name', styles: 'color' } ); // Consumes attribute and style.
* viewConsumable.consume( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be consumed.
* viewConsumable.consume( textNode ); // Consumes text node.
* viewConsumable.consume( docFragment ); // Consumes document fragment.
*
* Consuming classes and styles as attribute will test if all added classes/styles can be consumed.
*
* viewConsumable.consume( p, { attributes: 'class' } ); // Consume only if all added classes can be consumed.
* viewConsumable.consume( p, { attributes: 'style' } ); // Consume only if all added styles can be consumed.
*
* @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element
* @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.
* @param {Boolean} consumables.name If set to true element's name will be included.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.
* @param {String|Array.<String>} consumables.classes Class name or array of class names.
* @param {String|Array.<String>} consumables.styles Style name or array of style names.
* @returns {Boolean} Returns `true` when all items included in method's call can be consumed,
* otherwise returns `false`.
*/
consume( element, consumables ) {
if ( this.test( element, consumables ) ) {
if ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {
// For text nodes and document fragments set value to false.
this._consumables.set( element, false );
} else {
// For elements - consume consumables object.
this._consumables.get( element ).consume( consumables );
}
return true;
}
return false;
}
/**
* Reverts {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or
* {@link module:engine/view/documentfragment~DocumentFragment document fragment} so they can be consumed once again.
* Method does not revert items that were never previously added for consumption, even if they are included in
* method's call.
*
* viewConsumable.revert( p, { name: true } ); // Reverts element's name.
* viewConsumable.revert( p, { attributes: 'name' } ); // Reverts element's attribute.
* viewConsumable.revert( p, { classes: 'foobar' } ); // Reverts element's class.
* viewConsumable.revert( p, { styles: 'color' } ); // Reverts element's style.
* viewConsumable.revert( p, { attributes: 'name', styles: 'color' } ); // Reverts attribute and style.
* viewConsumable.revert( p, { classes: [ 'baz', 'bar' ] } ); // Multiple names can be reverted.
* viewConsumable.revert( textNode ); // Reverts text node.
* viewConsumable.revert( docFragment ); // Reverts document fragment.
*
* Reverting classes and styles as attribute will revert all classes/styles that were previously added for
* consumption.
*
* viewConsumable.revert( p, { attributes: 'class' } ); // Reverts all classes added for consumption.
* viewConsumable.revert( p, { attributes: 'style' } ); // Reverts all styles added for consumption.
*
* @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element
* @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.
* @param {Boolean} consumables.name If set to true element's name will be included.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.
* @param {String|Array.<String>} consumables.classes Class name or array of class names.
* @param {String|Array.<String>} consumables.styles Style name or array of style names.
*/
revert( element, consumables ) {
const elementConsumables = this._consumables.get( element );
if ( elementConsumables !== undefined ) {
if ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {
// For text nodes and document fragments - set consumable to true.
this._consumables.set( element, true );
} else {
// For elements - revert items from consumables object.
elementConsumables.revert( consumables );
}
}
}
/**
* Creates consumable object from {@link module:engine/view/element~Element view element}. Consumable object will include
* element's name and all its attributes, classes and styles.
*
* @static
* @param {module:engine/view/element~Element} element
* @returns {Object} consumables
*/
static consumablesFromElement( element ) {
const consumables = {
element,
name: true,
attributes: [],
classes: [],
styles: []
};
const attributes = element.getAttributeKeys();
for ( const attribute of attributes ) {
// Skip classes and styles - will be added separately.
if ( attribute == 'style' || attribute == 'class' ) {
continue;
}
consumables.attributes.push( attribute );
}
const classes = element.getClassNames();
for ( const className of classes ) {
consumables.classes.push( className );
}
const styles = element.getStyleNames();
for ( const style of styles ) {
consumables.styles.push( style );
}
return consumables;
}
/**
* Creates {@link module:engine/conversion/viewconsumable~ViewConsumable ViewConsumable} instance from
* {@link module:engine/view/node~Node node} or {@link module:engine/view/documentfragment~DocumentFragment document fragment}.
* Instance will contain all elements, child nodes, attributes, styles and classes added for consumption.
*
* @static
* @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} from View node or document fragment
* from which `ViewConsumable` will be created.
* @param {module:engine/conversion/viewconsumable~ViewConsumable} [instance] If provided, given `ViewConsumable` instance will be used
* to add all consumables. It will be returned instead of a new instance.
*/
static createFrom( from, instance ) {
if ( !instance ) {
instance = new ViewConsumable( from );
}
if ( from.is( '$text' ) ) {
instance.add( from );
return instance;
}
// Add `from` itself, if it is an element.
if ( from.is( 'element' ) ) {
instance.add( from, ViewConsumable.consumablesFromElement( from ) );
}
if ( from.is( 'documentFragment' ) ) {
instance.add( from );
}
for ( const child of from.getChildren() ) {
instance = ViewConsumable.createFrom( child, instance );
}
return instance;
}
}
/**
* This is a private helper-class for {@link module:engine/conversion/viewconsumable~ViewConsumable}.
* It represents and manipulates consumable parts of a single {@link module:engine/view/element~Element}.
*
* @private
*/
class ViewElementConsumables {
/**
* Creates ViewElementConsumables instance.
*
* @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} from View node or document fragment
* from which `ViewElementConsumables` is being created.
*/
constructor( from ) {
/**
* @readonly
* @member {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}
*/
this.element = from;
/**
* Flag indicating if name of the element can be consumed.
*
* @private
* @member {Boolean}
*/
this._canConsumeName = null;
/**
* Contains maps of element's consumables: attributes, classes and styles.
*
* @private
* @member {Object}
*/
this._consumables = {
attributes: new Map(),
styles: new Map(),
classes: new Map()
};
}
/**
* Adds consumable parts of the {@link module:engine/view/element~Element view element}.
* Element's name itself can be marked to be consumed (when element's name is consumed its attributes, classes and
* styles still could be consumed):
*
* consumables.add( { name: true } );
*
* Attributes classes and styles:
*
* consumables.add( { attributes: 'title', classes: 'foo', styles: 'color' } );
* consumables.add( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );
*
* Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`
* attribute is provided - it should be handled separately by providing `style` and `class` in consumables object.
*
* @param {Object} consumables Object describing which parts of the element can be consumed.
* @param {Boolean} consumables.name If set to `true` element's name will be added as consumable.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to add as consumable.
* @param {String|Array.<String>} consumables.classes Class name or array of class names to add as consumable.
* @param {String|Array.<String>} consumables.styles Style name or array of style names to add as consumable.
*/
add( consumables ) {
if ( consumables.name ) {
this._canConsumeName = true;
}
for ( const type in this._consumables ) {
if ( type in consumables ) {
this._add( type, consumables[ type ] );
}
}
}
/**
* Tests if parts of the {@link module:engine/view/node~Node view node} can be consumed.
*
* Element's name can be tested:
*
* consumables.test( { name: true } );
*
* Attributes classes and styles:
*
* consumables.test( { attributes: 'title', classes: 'foo', styles: 'color' } );
* consumables.test( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );
*
* @param {Object} consumables Object describing which parts of the element should be tested.
* @param {Boolean} consumables.name If set to `true` element's name will be tested.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to test.
* @param {String|Array.<String>} consumables.classes Class name or array of class names to test.
* @param {String|Array.<String>} consumables.styles Style name or array of style names to test.
* @returns {Boolean|null} `true` when all tested items can be consumed, `null` when even one of the items
* was never marked for consumption and `false` when even one of the items was already consumed.
*/
test( consumables ) {
// Check if name can be consumed.
if ( consumables.name && !this._canConsumeName ) {
return this._canConsumeName;
}
for ( const type in this._consumables ) {
if ( type in consumables ) {
const value = this._test( type, consumables[ type ] );
if ( value !== true ) {
return value;
}
}
}
// Return true only if all can be consumed.
return true;
}
/**
* Consumes parts of {@link module:engine/view/element~Element view element}. This function does not check if consumable item
* is already consumed - it consumes all consumable items provided.
* Element's name can be consumed:
*
* consumables.consume( { name: true } );
*
* Attributes classes and styles:
*
* consumables.consume( { attributes: 'title', classes: 'foo', styles: 'color' } );
* consumables.consume( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );
*
* @param {Object} consumables Object describing which parts of the element should be consumed.
* @param {Boolean} consumables.name If set to `true` element's name will be consumed.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to consume.
* @param {String|Array.<String>} consumables.classes Class name or array of class names to consume.
* @param {String|Array.<String>} consumables.styles Style name or array of style names to consume.
*/
consume( consumables ) {
if ( consumables.name ) {
this._canConsumeName = false;
}
for ( const type in this._consumables ) {
if ( type in consumables ) {
this._consume( type, consumables[ type ] );
}
}
}
/**
* Revert already consumed parts of {@link module:engine/view/element~Element view Element}, so they can be consumed once again.
* Element's name can be reverted:
*
* consumables.revert( { name: true } );
*
* Attributes classes and styles:
*
* consumables.revert( { attributes: 'title', classes: 'foo', styles: 'color' } );
* consumables.revert( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );
*
* @param {Object} consumables Object describing which parts of the element should be reverted.
* @param {Boolean} consumables.name If set to `true` element's name will be reverted.
* @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to revert.
* @param {String|Array.<String>} consumables.classes Class name or array of class names to revert.
* @param {String|Array.<String>} consumables.styles Style name or array of style names to revert.
*/
revert( consumables ) {
if ( consumables.name ) {
this._canConsumeName = true;
}
for ( const type in this._consumables ) {
if ( type in consumables ) {
this._revert( type, consumables[ type ] );
}
}
}
/**
* Helper method that adds consumables of a given type: attribute, class or style.
*
* Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`
* type is provided - it should be handled separately by providing actual style/class type.
*
* @private
* @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.
* @param {String|Array.<String>} item Consumable item or array of items.
*/
_add( type, item ) {
const items = isArray( item ) ? item : [ item ];
const consumables = this._consumables[ type ];
for ( const name of items ) {
if ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {
/**
* Class and style attributes should be handled separately in
* {@link module:engine/conversion/viewconsumable~ViewConsumable#add `ViewConsumable#add()`}.
*
* What you have done is trying to use:
*
* consumables.add( { attributes: [ 'class', 'style' ] } );
*
* While each class and style should be registered separately:
*
* consumables.add( { classes: 'some-class', styles: 'font-weight' } );
*
* @error viewconsumable-invalid-attribute
*/
throw new CKEditorError( 'viewconsumable-invalid-attribute', this );
}
consumables.set( name, true );
if ( type === 'styles' ) {
for ( const alsoName of this.element.document.stylesProcessor.getRelatedStyles( name ) ) {
consumables.set( alsoName, true );
}
}
}
}
/**
* Helper method that tests consumables of a given type: attribute, class or style.
*
* @private
* @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.
* @param {String|Array.<String>} item Consumable item or array of items.
* @returns {Boolean|null} Returns `true` if all items can be consumed, `null` when one of the items cannot be
* consumed and `false` when one of the items is already consumed.
*/
_test( type, item ) {
const items = isArray( item ) ? item : [ item ];
const consumables = this._consumables[ type ];
for ( const name of items ) {
if ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {
const consumableName = name == 'class' ? 'classes' : 'styles';
// Check all classes/styles if class/style attribute is tested.
const value = this._test( consumableName, [ ...this._consumables[ consumableName ].keys() ] );
if ( value !== true ) {
return value;
}
} else {
const value = consumables.get( name );
// Return null if attribute is not found.
if ( value === undefined ) {
return null;
}
if ( !value ) {
return false;
}
}
}
return true;
}
/**
* Helper method that consumes items of a given type: attribute, class or style.
*
* @private
* @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.
* @param {String|Array.<String>} item Consumable item or array of items.
*/
_consume( type, item ) {
const items = isArray( item ) ? item : [ item ];
const consumables = this._consumables[ type ];
for ( const name of items ) {
if ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {
const consumableName = name == 'class' ? 'classes' : 'styles';
// If class or style is provided for consumption - consume them all.
this._consume( consumableName, [ ...this._consumables[ consumableName ].keys() ] );
} else {
consumables.set( name, false );
if ( type == 'styles' ) {
for ( const toConsume of this.element.document.stylesProcessor.getRelatedStyles( name ) ) {
consumables.set( toConsume, false );
}
}
}
}
}
/**
* Helper method that reverts items of a given type: attribute, class or style.
*
* @private
* @param {String} type Type of the consumable item: `attributes`, `classes` or , `styles`.
* @param {String|Array.<String>} item Consumable item or array of items.
*/
_revert( type, item ) {
const items = isArray( item ) ? item : [ item ];
const consumables = this._consumables[ type ];
for ( const name of items ) {
if ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {
const consumableName = name == 'class' ? 'classes' : 'styles';
// If class or style is provided for reverting - revert them all.
this._revert( consumableName, [ ...this._consumables[ consumableName ].keys() ] );
} else {
const value = consumables.get( name );
if ( value === false ) {
consumables.set( name, true );
}
}
}
}
}
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