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- /**
- * @license Copyright (c) 2003-2019, CKSource - Frederico Knabben. All rights reserved.
- * For licensing, see LICENSE.md.
- */
- /**
- * @module engine/conversion/conversion
- */
- import CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';
- import UpcastHelpers from './upcasthelpers';
- import DowncastHelpers from './downcasthelpers';
- /**
- * A utility class that helps add converters to upcast and downcast dispatchers.
- *
- * We recommend reading the {@glink framework/guides/architecture/editing-engine Editing engine architecture} guide first to
- * understand the core concepts of the conversion mechanisms.
- *
- * An instance of the conversion manager is available in the
- * {@link module:core/editor/editor~Editor#conversion `editor.conversion`} property
- * and by default has the following groups of dispatchers (i.e. directions of conversion):
- *
- * * `downcast` (editing and data downcasts)
- * * `editingDowncast`
- * * `dataDowncast`
- * * `upcast`
- *
- * # One-way converters
- *
- * To add a converter to a specific group, use the {@link module:engine/conversion/conversion~Conversion#for `for()`}
- * method:
- *
- * // Add a converter to editing downcast and data downcast.
- * editor.conversion.for( 'downcast' ).elementToElement( config ) );
- *
- * // Add a converter to the data pipepline only:
- * editor.conversion.for( 'dataDowncast' ).elementToElement( dataConversionConfig ) );
- *
- * // And a slightly different one for the editing pipeline:
- * editor.conversion.for( 'editingDowncast' ).elementToElement( editingConversionConfig ) );
- *
- * See {@link module:engine/conversion/conversion~Conversion#for `for()`} method documentation to learn more about
- * available conversion helpers and how to use your custom ones.
- *
- * # Two-way converters
- *
- * Besides using one-way converters via the `for()` method, you can also use other methods available in this
- * class to add two-way converters (upcast and downcast):
- *
- * * {@link module:engine/conversion/conversion~Conversion#elementToElement `elementToElement()`} –
- * Model element to view element and vice versa.
- * * {@link module:engine/conversion/conversion~Conversion#attributeToElement `attributeToElement()`} –
- * Model attribute to view element and vice versa.
- * * {@link module:engine/conversion/conversion~Conversion#attributeToAttribute `attributeToAttribute()`} –
- * Model attribute to view element and vice versa.
- */
- export default class Conversion {
- /**
- * Creates a new conversion instance.
- *
- * @param {module:engine/conversion/downcastdispatcher~DowncastDispatcher|
- * Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher>} downcastDispatchers
- * @param {module:engine/conversion/upcastdispatcher~UpcastDispatcher|
- * Array.<module:engine/conversion/upcastdispatcher~UpcastDispatcher>} upcastDispatchers
- */
- constructor( downcastDispatchers, upcastDispatchers ) {
- /**
- * Maps dispatchers group name to ConversionHelpers instances.
- *
- * @private
- * @member {Map.<String,module:engine/conversion/conversionhelpers~ConversionHelpers>}
- */
- this._helpers = new Map();
- // Define default 'downcast' & 'upcast' dispatchers groups. Those groups are always available as two-way converters needs them.
- this._downcast = Array.isArray( downcastDispatchers ) ? downcastDispatchers : [ downcastDispatchers ];
- this._createConversionHelpers( { name: 'downcast', dispatchers: this._downcast, isDowncast: true } );
- this._upcast = Array.isArray( upcastDispatchers ) ? upcastDispatchers : [ upcastDispatchers ];
- this._createConversionHelpers( { name: 'upcast', dispatchers: this._upcast, isDowncast: false } );
- }
- /**
- * Define an alias for registered dispatcher.
- *
- * const conversion = new Conversion(
- * [ dataDowncastDispatcher, editingDowncastDispatcher ],
- * upcastDispatcher
- * );
- *
- * conversion.addAlias( 'dataDowncast', dataDowncastDispatcher );
- *
- * @param {String} alias An alias of a dispatcher.
- * @param {module:engine/conversion/downcastdispatcher~DowncastDispatcher|
- * module:engine/conversion/upcastdispatcher~UpcastDispatcher} dispatcher Dispatcher which should have an alias.
- */
- addAlias( alias, dispatcher ) {
- const isDowncast = this._downcast.includes( dispatcher );
- const isUpcast = this._upcast.includes( dispatcher );
- if ( !isUpcast && !isDowncast ) {
- /**
- * Trying to register and alias for a dispatcher that nas not been registered.
- *
- * @error conversion-add-alias-dispatcher-not-registered
- */
- throw new CKEditorError( 'conversion-add-alias-dispatcher-not-registered: ' +
- 'Trying to register and alias for a dispatcher that nas not been registered.' );
- }
- this._createConversionHelpers( { name: alias, dispatchers: [ dispatcher ], isDowncast: isDowncast } );
- }
- /**
- * Provides a chainable API to assign converters to conversion dispatchers group.
- *
- * If the given group name has not been registered, the
- * {@link module:utils/ckeditorerror~CKEditorError `conversion-for-unknown-group` error} is thrown.
- *
- * You can use conversion helpers available directly in the `for()` chain or your custom ones via
- * the {@link module:engine/conversion/conversionhelpers~ConversionHelpers#add `add()`} method.
- *
- * # Using bulit-in conversion helpers
- *
- * The `for()` chain comes with a set of conversion helpers which you can use like this:
- *
- * editor.conversion.for( 'downcast' )
- * .elementToElement( config1 ) // Adds an element-to-element downcast converter.
- * .attributeToElement( config2 ); // Adds an attribute-to-element downcast converter.
- *
- * editor.conversion.for( 'upcast' )
- * .elementToAttribute( config3 ); // Adds an element-to-attribute upcast converter.
- *
- * Refer to the documentation of built-in conversion helpers to learn about their configuration options.
- *
- * * downcast (model-to-view) conversion helpers:
- *
- * * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#elementToElement `elementToElement()`},
- * * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#attributeToElement `attributeToElement()`},
- * * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#attributeToAttribute `attributeToAttribute()`}.
- * * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#markerToElement `markerToElement()`}.
- * * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#markerToHighlight `markerToHighlight()`}.
- *
- * * upcast (view-to-model) conversion helpers:
- *
- * * {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToElement `elementToElement()`},
- * * {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToAttribute `elementToAttribute()`},
- * * {@link module:engine/conversion/upcasthelpers~UpcastHelpers#attributeToAttribute `attributeToAttribute()`}.
- * * {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToMarker `elementToMarker()`}.
- *
- * # Using custom conversion helpers
- *
- * If you need to implement a nontypical converter, you can do so by calling:
- *
- * editor.conversion.for( direction ).add( customHelper );
- *
- * The `.add()` method takes exactly one parameter, which is a function. This function should accept one parameter that
- * is a dispatcher instance. The function should add an actual converter to the passed dispatcher instance.
- *
- * Example:
- *
- * editor.conversion.for( 'upcast' ).add( dispatcher => {
- * dispatcher.on( 'element:a', ( evt, data, conversionApi ) => {
- * // Do something with a view <a> element.
- * } );
- * } );
- *
- * Refer to the documentation of {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher}
- * and {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher} to learn how to write
- * custom converters.
- *
- * @param {String} groupName The name of dispatchers group to add the converters to.
- * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers|module:engine/conversion/upcasthelpers~UpcastHelpers}
- */
- for( groupName ) {
- if ( !this._helpers.has( groupName ) ) {
- /**
- * Trying to add a converter to an unknown dispatchers group.
- *
- * @error conversion-for-unknown-group
- */
- throw new CKEditorError( 'conversion-for-unknown-group: Trying to add a converter to an unknown dispatchers group.' );
- }
- return this._helpers.get( groupName );
- }
- /**
- * Sets up converters between the model and the view that convert a model element to a view element (and vice versa).
- * For example, the model `<paragraph>Foo</paragraph>` is `<p>Foo</p>` in the view.
- *
- * // A simple conversion from the `paragraph` model element to the `<p>` view element (and vice versa).
- * editor.conversion.elementToElement( { model: 'paragraph', view: 'p' } );
- *
- * // Override other converters by specifying a converter definition with a higher priority.
- * editor.conversion.elementToElement( { model: 'paragraph', view: 'div', converterPriority: 'high' } );
- *
- * // View specified as an object instead of a string.
- * editor.conversion.elementToElement( {
- * model: 'fancyParagraph',
- * view: {
- * name: 'p',
- * classes: 'fancy'
- * }
- * } );
- *
- * // Use `upcastAlso` to define other view elements that should also be converted to a `paragraph` element.
- * editor.conversion.elementToElement( {
- * model: 'paragraph',
- * view: 'p',
- * upcastAlso: [
- * 'div',
- * {
- * // Any element with the `display: block` style.
- * styles: {
- * display: 'block'
- * }
- * }
- * ]
- * } );
- *
- * // `upcastAlso` set as callback enables a conversion of a wide range of different view elements.
- * editor.conversion.elementToElement( {
- * model: 'heading',
- * view: 'h2',
- * // Convert "headling-like" paragraphs to headings.
- * upcastAlso: viewElement => {
- * const fontSize = viewElement.getStyle( 'font-size' );
- *
- * if ( !fontSize ) {
- * return null;
- * }
- *
- * const match = fontSize.match( /(\d+)\s*px/ );
- *
- * if ( !match ) {
- * return null;
- * }
- *
- * const size = Number( match[ 1 ] );
- *
- * if ( size > 26 ) {
- * // Returned value can be an object with the matched properties.
- * // These properties will be "consumed" during the conversion.
- * // See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.
- *
- * return { name: true, styles: [ 'font-size' ] };
- * }
- *
- * return null;
- * }
- * } );
- *
- * `definition.model` is a `String` with a model element name to convert from or to.
- * See {@link module:engine/conversion/conversion~ConverterDefinition} to learn about other parameters.
- *
- * @param {module:engine/conversion/conversion~ConverterDefinition} definition The converter definition.
- */
- elementToElement( definition ) {
- // Set up downcast converter.
- this.for( 'downcast' ).elementToElement( definition );
- // Set up upcast converter.
- for ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {
- this.for( 'upcast' )
- .elementToElement( {
- model,
- view,
- converterPriority: definition.converterPriority
- } );
- }
- }
- /**
- * Sets up converters between the model and the view that convert a model attribute to a view element (and vice versa).
- * For example, a model text node with `"Foo"` as data and the `bold` attribute is `<strong>Foo</strong>` in the view.
- *
- * // A simple conversion from the `bold=true` attribute to the `<strong>` view element (and vice versa).
- * editor.conversion.attributeToElement( { model: 'bold', view: 'strong' } );
- *
- * // Override other converters by specifying a converter definition with a higher priority.
- * editor.conversion.attributeToElement( { model: 'bold', view: 'b', converterPriority: 'high' } );
- *
- * // View specified as an object instead of a string.
- * editor.conversion.attributeToElement( {
- * model: 'bold',
- * view: {
- * name: 'span',
- * classes: 'bold'
- * }
- * } );
- *
- * // Use `config.model.name` to define the conversion only from a given node type, `$text` in this case.
- * // The same attribute on different elements may then be handled by a different converter.
- * editor.conversion.attributeToElement( {
- * model: {
- * key: 'textDecoration',
- * values: [ 'underline', 'lineThrough' ],
- * name: '$text'
- * },
- * view: {
- * underline: {
- * name: 'span',
- * styles: {
- * 'text-decoration': 'underline'
- * }
- * },
- * lineThrough: {
- * name: 'span',
- * styles: {
- * 'text-decoration': 'line-through'
- * }
- * }
- * }
- * } );
- *
- * // Use `upcastAlso` to define other view elements that should also be converted to the `bold` attribute.
- * editor.conversion.attributeToElement( {
- * model: 'bold',
- * view: 'strong',
- * upcastAlso: [
- * 'b',
- * {
- * name: 'span',
- * classes: 'bold'
- * },
- * {
- * name: 'span',
- * styles: {
- * 'font-weight': 'bold'
- * }
- * },
- * viewElement => {
- * const fontWeight = viewElement.getStyle( 'font-weight' );
- *
- * if ( viewElement.is( 'span' ) && fontWeight && /\d+/.test() && Number( fontWeight ) > 500 ) {
- * // Returned value can be an object with the matched properties.
- * // These properties will be "consumed" during the conversion.
- * // See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.
- *
- * return {
- * name: true,
- * styles: [ 'font-weight' ]
- * };
- * }
- * }
- * ]
- * } );
- *
- * // Conversion from and to a model attribute key whose value is an enum (`fontSize=big|small`).
- * // `upcastAlso` set as callback enables a conversion of a wide range of different view elements.
- * editor.conversion.attributeToElement( {
- * model: {
- * key: 'fontSize',
- * values: [ 'big', 'small' ]
- * },
- * view: {
- * big: {
- * name: 'span',
- * styles: {
- * 'font-size': '1.2em'
- * }
- * },
- * small: {
- * name: 'span',
- * styles: {
- * 'font-size': '0.8em'
- * }
- * }
- * },
- * upcastAlso: {
- * big: viewElement => {
- * const fontSize = viewElement.getStyle( 'font-size' );
- *
- * if ( !fontSize ) {
- * return null;
- * }
- *
- * const match = fontSize.match( /(\d+)\s*px/ );
- *
- * if ( !match ) {
- * return null;
- * }
- *
- * const size = Number( match[ 1 ] );
- *
- * if ( viewElement.is( 'span' ) && size > 10 ) {
- * // Returned value can be an object with the matched properties.
- * // These properties will be "consumed" during the conversion.
- * // See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.
- *
- * return { name: true, styles: [ 'font-size' ] };
- * }
- *
- * return null;
- * },
- * small: viewElement => {
- * const fontSize = viewElement.getStyle( 'font-size' );
- *
- * if ( !fontSize ) {
- * return null;
- * }
- *
- * const match = fontSize.match( /(\d+)\s*px/ );
- *
- * if ( !match ) {
- * return null;
- * }
- *
- * const size = Number( match[ 1 ] );
- *
- * if ( viewElement.is( 'span' ) && size < 10 ) {
- * // Returned value can be an object with the matched properties.
- * // These properties will be "consumed" during the conversion.
- * // See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.
- *
- * return { name: true, styles: [ 'font-size' ] };
- * }
- *
- * return null;
- * }
- * }
- * } );
- *
- * The `definition.model` parameter specifies which model attribute should be converted from or to. It can be a `{ key, value }` object
- * describing the attribute key and value to convert or a `String` specifying just the attribute key (then `value` is set to `true`).
- * See {@link module:engine/conversion/conversion~ConverterDefinition} to learn about other parameters.
- *
- * @param {module:engine/conversion/conversion~ConverterDefinition} definition The converter definition.
- */
- attributeToElement( definition ) {
- // Set up downcast converter.
- this.for( 'downcast' ).attributeToElement( definition );
- // Set up upcast converter.
- for ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {
- this.for( 'upcast' )
- .elementToAttribute( {
- view,
- model,
- converterPriority: definition.converterPriority
- } );
- }
- }
- /**
- * Sets up converters between the model and the view that convert a model attribute to a view attribute (and vice versa).
- * For example, `<image src='foo.jpg'></image>` is converted to `<img src='foo.jpg'></img>` (the same attribute key and value).
- * This type of converters is intended to be used with {@link module:engine/model/element~Element model element} nodes.
- * To convert text attributes {@link module:engine/conversion/conversion~Conversion#attributeToElement `attributeToElement converter`}
- * should be set up.
- *
- * // A simple conversion from the `source` model attribute to the `src` view attribute (and vice versa).
- * editor.conversion.attributeToAttribute( { model: 'source', view: 'src' } );
- *
- * // Attribute values are strictly specified.
- * editor.conversion.attributeToAttribute( {
- * model: {
- * name: 'image',
- * key: 'aside',
- * values: [ 'aside' ]
- * },
- * view: {
- * aside: {
- * name: 'img',
- * key: 'class',
- * value: [ 'aside', 'half-size' ]
- * }
- * }
- * } );
- *
- * // Set the style attribute.
- * editor.conversion.attributeToAttribute( {
- * model: {
- * name: 'image',
- * key: 'aside',
- * values: [ 'aside' ]
- * },
- * view: {
- * aside: {
- * name: 'img',
- * key: 'style',
- * value: {
- * float: 'right',
- * width: '50%',
- * margin: '5px'
- * }
- * }
- * }
- * } );
- *
- * // Conversion from and to a model attribute key whose value is an enum (`align=right|center`).
- * // Use `upcastAlso` to define other view elements that should also be converted to the `align=right` attribute.
- * editor.conversion.attributeToAttribute( {
- * model: {
- * key: 'align',
- * values: [ 'right', 'center' ]
- * },
- * view: {
- * right: {
- * key: 'class',
- * value: 'align-right'
- * },
- * center: {
- * key: 'class',
- * value: 'align-center'
- * }
- * },
- * upcastAlso: {
- * right: {
- * styles: {
- * 'text-align': 'right'
- * }
- * },
- * center: {
- * styles: {
- * 'text-align': 'center'
- * }
- * }
- * }
- * } );
- *
- * The `definition.model` parameter specifies which model attribute should be converted from and to.
- * It can be a `{ key, [ values ], [ name ] }` object or a `String`, which will be treated like `{ key: definition.model }`.
- * The `key` property is the model attribute key to convert from and to.
- * The `values` are the possible model attribute values. If `values` is not set, the model attribute value will be the same as the
- * view attribute value.
- * If `name` is set, the conversion will be set up only for model elements with the given name.
- *
- * The `definition.view` parameter specifies which view attribute should be converted from and to.
- * It can be a `{ key, value, [ name ] }` object or a `String`, which will be treated like `{ key: definition.view }`.
- * The `key` property is the view attribute key to convert from and to.
- * The `value` is the view attribute value to convert from and to. If `definition.value` is not set, the view attribute value will be
- * the same as the model attribute value.
- * If `key` is `'class'`, `value` can be a `String` or an array of `String`s.
- * If `key` is `'style'`, `value` is an object with key-value pairs.
- * In other cases, `value` is a `String`.
- * If `name` is set, the conversion will be set up only for model elements with the given name.
- * If `definition.model.values` is set, `definition.view` is an object that assigns values from `definition.model.values`
- * to `{ key, value, [ name ] }` objects.
- *
- * `definition.upcastAlso` specifies which other matching view elements should also be upcast to the given model configuration.
- * If `definition.model.values` is set, `definition.upcastAlso` should be an object assigning values from `definition.model.values`
- * to {@link module:engine/view/matcher~MatcherPattern}s or arrays of {@link module:engine/view/matcher~MatcherPattern}s.
- *
- * **Note:** `definition.model` and `definition.view` form should be mirrored, so the same types of parameters should
- * be given in both parameters.
- *
- * @param {Object} definition The converter definition.
- * @param {String|Object} definition.model The model attribute to convert from and to.
- * @param {String|Object} definition.view The view attribute to convert from and to.
- * @param {module:engine/view/matcher~MatcherPattern|Array.<module:engine/view/matcher~MatcherPattern>} [definition.upcastAlso]
- * Any view element matching `definition.upcastAlso` will also be converted to the given model attribute. `definition.upcastAlso`
- * is used only if `config.model.values` is specified.
- */
- attributeToAttribute( definition ) {
- // Set up downcast converter.
- this.for( 'downcast' ).attributeToAttribute( definition );
- // Set up upcast converter.
- for ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {
- this.for( 'upcast' )
- .attributeToAttribute( {
- view,
- model
- } );
- }
- }
- /**
- * Creates and caches conversion helpers for given dispatchers group.
- *
- * @private
- * @param {Object} options
- * @param {String} options.name Group name.
- * @param {Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher|
- * module:engine/conversion/upcastdispatcher~UpcastDispatcher>} options.dispatchers
- * @param {Boolean} options.isDowncast
- */
- _createConversionHelpers( { name, dispatchers, isDowncast } ) {
- if ( this._helpers.has( name ) ) {
- /**
- * Trying to register a group name that has already been registered.
- *
- * @error conversion-group-exists
- */
- throw new CKEditorError( 'conversion-group-exists: Trying to register a group name that has already been registered.' );
- }
- const helpers = isDowncast ? new DowncastHelpers( dispatchers ) : new UpcastHelpers( dispatchers );
- this._helpers.set( name, helpers );
- }
- }
- /**
- * Defines how the model should be converted from and to the view.
- *
- * @typedef {Object} module:engine/conversion/conversion~ConverterDefinition
- *
- * @property {*} [model] The model conversion definition. Describes the model element or model attribute to convert. This parameter differs
- * for different functions that accept `ConverterDefinition`. See the description of the function to learn how to set it.
- * @property {module:engine/view/elementdefinition~ElementDefinition|Object} view The definition of the view element to convert from and
- * to. If `model` describes multiple values, `view` is an object that assigns these values (`view` object keys) to view element definitions
- * (`view` object values).
- * @property {module:engine/view/matcher~MatcherPattern|Array.<module:engine/view/matcher~MatcherPattern>} [upcastAlso]
- * Any view element matching `upcastAlso` will also be converted to the model. If `model` describes multiple values, `upcastAlso`
- * is an object that assigns these values (`upcastAlso` object keys) to {@link module:engine/view/matcher~MatcherPattern}s
- * (`upcastAlso` object values).
- * @property {module:utils/priorities~PriorityString} [converterPriority] The converter priority.
- */
- // Helper function that creates a joint array out of an item passed in `definition.view` and items passed in
- // `definition.upcastAlso`.
- //
- // @param {module:engine/conversion/conversion~ConverterDefinition} definition
- // @returns {Array} Array containing view definitions.
- function* _getAllUpcastDefinitions( definition ) {
- if ( definition.model.values ) {
- for ( const value of definition.model.values ) {
- const model = { key: definition.model.key, value };
- const view = definition.view[ value ];
- const upcastAlso = definition.upcastAlso ? definition.upcastAlso[ value ] : undefined;
- yield* _getUpcastDefinition( model, view, upcastAlso );
- }
- } else {
- yield* _getUpcastDefinition( definition.model, definition.view, definition.upcastAlso );
- }
- }
- function* _getUpcastDefinition( model, view, upcastAlso ) {
- yield { model, view };
- if ( upcastAlso ) {
- upcastAlso = Array.isArray( upcastAlso ) ? upcastAlso : [ upcastAlso ];
- for ( const upcastAlsoItem of upcastAlso ) {
- yield { model, view: upcastAlsoItem };
- }
- }
- }
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