mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/VisualEditor
synced 2024-12-03 18:36:20 +00:00
dae599ac2f
* Parsoid outputs bare newlines after a heading unless it's followed by a <p>, so strip leading and trailing newlines in all bare text * Adding a leading newline in <p>s is only needed if preceded by a heading, don't add it otherwise * Headings need a bare newline after them unless followed by a <p> * Headings also need a bare newline before them if preceded by a <pre> Change-Id: Ib02f800b26453541604e920fbb3845c51cdc6dea
614 lines
20 KiB
JavaScript
614 lines
20 KiB
JavaScript
/**
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* Converter between HTML DOM and VisualEditor linear data.
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*
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* @class
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* @constructor
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* @param {Object} options Conversion options
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*/
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ve.dm.Converter = function( nodeFactory, annotationFactory ) {
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// Properties
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this.nodeFactory = nodeFactory;
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this.annotationFactory = annotationFactory;
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this.elements = { 'toDomElement': {}, 'toDataElement': {}, 'dataElementTypes': {} };
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this.annotations = { 'toDomElement': {}, 'toDataAnnotation': {} };
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// Events
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this.nodeFactory.addListenerMethod( this, 'register', 'onNodeRegister' );
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this.annotationFactory.addListenerMethod( this, 'register', 'onAnnotationRegister' );
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};
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/* Static Methods */
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/**
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* Get linear model data from a string optionally applying annotations
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*
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* @param {String} text Plain text to convert
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* @param {Array} [annotations] Array of annotation objects to apply
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* @returns {Array} Linear model data, one element per character
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*/
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ve.dm.Converter.getDataContentFromText = function( text, annotations ) {
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var characters = text.split( '' ),
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annotationMap = {},
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i;
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if ( !annotations || annotations.length === 0 ) {
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return characters;
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}
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// Build annotation map
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for ( i = 0; i < annotations.length; i++ ) {
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if ( annotations[i].data && ve.isEmptyObject( annotations[i].data ) ) {
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// Cleanup empty data property
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delete annotations[i].data;
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}
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annotationMap[ve.getHash( annotations[i] )] = annotations[i];
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}
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// Apply annotations to characters
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for ( i = 0; i < characters.length; i++ ) {
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// Make a shallow copy of the annotationMap object, otherwise adding an annotation to one
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// character automatically adds it to all of others as well, annotations should be treated
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// as immutable, so it's OK to share references, but annotation maps are not immutable, so
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// it's not safe to share references - each annotated character needs it's own map
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characters[i] = [characters[i], ve.extendObject( {}, annotationMap )];
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}
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return characters;
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};
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/* Methods */
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/**
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* Responds to register events from the node factory.
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*
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* If a node is special; such as document, alienInline, alienBlock and text; it's converters data
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* should be set to null, as to distinguish it from a new node type that someone has simply
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* forgotten to implement converters for.
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*
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* @method
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* @param {String} type Node type
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* @param {Function} constructor Node constructor
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* @throws 'Missing conversion data in node implementation of {type}'
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*/
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ve.dm.Converter.prototype.onNodeRegister = function( dataElementType, constructor ) {
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if ( constructor.converters === undefined ) {
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throw 'Missing conversion data in node implementation of ' + dataElementType;
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} else if ( constructor.converters !== null ) {
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var domElementTypes = constructor.converters.domElementTypes,
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toDomElement = constructor.converters.toDomElement,
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toDataElement = constructor.converters.toDataElement;
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// Registration
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this.elements.toDomElement[dataElementType] = toDomElement;
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for ( var i = 0; i < domElementTypes.length; i++ ) {
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this.elements.toDataElement[domElementTypes[i]] = toDataElement;
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this.elements.dataElementTypes[domElementTypes[i]] = dataElementType;
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}
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}
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};
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/**
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* Responds to register events from the annotation factory.
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*
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* @method
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* @param {String} type Base annotation type
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* @param {Function} constructor Annotation constructor
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* @throws 'Missing conversion data in annotation implementation of {type}'
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*/
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ve.dm.Converter.prototype.onAnnotationRegister = function( dataElementType, constructor ) {
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if ( constructor.converters === undefined ) {
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throw 'Missing conversion data in annotation implementation of ' + dataElementType;
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} else if ( constructor.converters !== null ) {
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var domElementTypes = constructor.converters.domElementTypes,
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toDomElement = constructor.converters.toDomElement,
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toDataAnnotation = constructor.converters.toDataAnnotation;
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// Registration
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this.annotations.toDomElement[dataElementType] = toDomElement;
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for ( var i = 0; i < domElementTypes.length; i++ ) {
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this.annotations.toDataAnnotation[domElementTypes[i]] = toDataAnnotation;
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}
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}
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};
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/**
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* Get the DOM element for a given linear model element.
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*
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* This invokes the toDomElement function registered for the element type.
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* NOTE: alienBlock and alienInline elements are not supported, if you pass them this function
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* will return false. (Opposite of District 9: no aliens allowed.)
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*
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* @method
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* @param {Object} dataElement Linear model element
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* @returns {HTMLElement|false} DOM element, or false if this element cannot be converted
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*/
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ve.dm.Converter.prototype.getDomElementFromDataElement = function( dataElement ) {
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var dataElementType = dataElement.type;
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if (
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// Aliens
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dataElementType === 'alienInline' || dataElementType === 'alienBlock' ||
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// Unsupported elements
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!( dataElementType in this.elements.toDomElement)
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) {
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return false;
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}
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var domElement = this.elements.toDomElement[dataElementType]( dataElementType, dataElement ),
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dataElementAttributes = dataElement.attributes;
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if ( dataElementAttributes ) {
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for ( var key in dataElementAttributes ) {
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// Only include 'html/*' attributes and strip the 'html/' from the beginning of the name
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if ( key.indexOf( 'html/' ) === 0 ) {
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domElement.setAttribute( key.substr( 5 ), dataElementAttributes[key] );
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}
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}
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}
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return domElement;
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};
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/**
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* Get the linear model data element for a given DOM element.
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*
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* This invokes the toDataElement function registered for the element type, after checking that
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* there is no data-mw-gc attribute.
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*
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* @method
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* @param {HTMLElement} domElement DOM element
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* @returns {Object|false} Linear model element, or false if this node cannot be converted
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*/
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ve.dm.Converter.prototype.getDataElementFromDomElement = function( domElement ) {
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var domElementType = domElement.nodeName.toLowerCase();
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if (
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// Generated elements
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domElement.hasAttribute( 'data-mw-gc' ) ||
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// Unsupported elements
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!( domElementType in this.elements.toDataElement )
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) {
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return false;
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}
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var dataElement = this.elements.toDataElement[domElementType]( domElementType, domElement ),
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domElementAttributes = domElement.attributes;
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if ( domElementAttributes.length ) {
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var dataElementAttributes = dataElement.attributes = dataElement.attributes || {};
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// Inlcude all attributes and prepend 'html/' to each attribute name
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for ( var i = 0; i < domElementAttributes.length; i++ ) {
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var domElementAttribute = domElementAttributes[i];
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dataElementAttributes['html/' + domElementAttribute.name] = domElementAttribute.value;
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}
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}
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return dataElement;
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};
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/**
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* Check if an HTML DOM node represents an annotation, and if so, build an annotation object for it.
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*
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* @example Annotation Object
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* { 'type': 'type', data: { 'key': 'value', ... } }
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*
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* @param {HTMLElement} domElement HTML DOM node
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* @returns {Object|false} Annotation object, or false if this node is not an annotation
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*/
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ve.dm.Converter.prototype.getDataAnnotationFromDomElement = function( domElement ) {
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var domElementType = domElement.nodeName.toLowerCase(),
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toDataAnnotation = this.annotations.toDataAnnotation[domElementType];
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if ( typeof toDataAnnotation === 'function' ) {
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return toDataAnnotation( domElementType, domElement );
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}
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return false;
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};
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/**
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* Build an HTML DOM node for a linear model annotation.
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*
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* @method
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* @param {Object} dataAnnotation Annotation object
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* @returns {HTMLElement|false} HTML DOM node, or false if this annotation is not known
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*/
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ve.dm.Converter.prototype.getDomElementFromDataAnnotation = function( dataAnnotation ) {
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var split = dataAnnotation.type.split( '/', 2 ),
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baseType = split[0],
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subType = split.slice( 1 ).join( '/' ),
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toDomElement = this.annotations.toDomElement[baseType];
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if ( typeof toDomElement === 'function' ) {
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return toDomElement( subType, dataAnnotation );
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}
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return false;
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};
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/**
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* Convert an HTML DOM tree to a linear model.
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*
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* Do not use the annotations, dataElement and path parameters, they're used for internal
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* recursion only.
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*
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* @method
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* @param {HTMLElement} domElement Wrapper div containing the HTML to convert
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* @param {Array} [annotations] Array of annotations (objects) to apply to the generated data
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* @param {Object} [dataElement] Data element to wrap the returned data in
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* @param {Array} [path] Array of linear model element types
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* @returns {Array} Linear model data
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*/
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ve.dm.Converter.prototype.getDataFromDom = function( domElement, annotations, dataElement, path, alreadyWrapped ) {
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function createAlien( domElement, isInline ) {
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var type = isInline ? 'alienInline' : 'alienBlock';
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return [
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{
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'type': type,
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'attributes': {
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'html': $( '<div>' ).append( $( domElement ).clone() ).html()
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}
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},
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{ 'type': '/' + type }
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];
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}
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// Fallback to defaults
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annotations = annotations || [];
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path = path || ['document'];
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var data = [],
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branchType = path[path.length - 1],
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branchIsContent = ve.dm.nodeFactory.canNodeContainContent( branchType ),
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wrapping = false;
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// Open element
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if ( dataElement ) {
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data.push( dataElement );
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}
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// Add contents
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for ( var i = 0; i < domElement.childNodes.length; i++ ) {
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var childDomElement = domElement.childNodes[i];
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switch ( childDomElement.nodeType ) {
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case Node.ELEMENT_NODE:
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// Detect generated content and wrap it in an alien node
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if ( childDomElement.hasAttribute( 'data-mw-gc' ) ) {
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data = data.concat( createAlien( childDomElement, branchIsContent ) );
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break;
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}
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// Detect and handle annotated content
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var annotation = this.getDataAnnotationFromDomElement( childDomElement );
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if ( annotation ) {
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// Start auto-wrapping of bare content
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if ( !wrapping && !alreadyWrapped && !branchIsContent ) {
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data.push( { 'type': 'paragraph' } );
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wrapping = true;
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}
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// Append child element data
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data = data.concat(
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this.getDataFromDom(
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childDomElement, annotations.concat( annotation ), undefined, path, wrapping || alreadyWrapped
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)
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);
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break;
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}
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// End auto-wrapping of bare content
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if ( wrapping ) {
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data.push( { 'type': '/paragraph' } );
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wrapping = false;
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}
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// Append child element data
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var childDataElement = this.getDataElementFromDomElement( childDomElement );
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if ( childDataElement ) {
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data = data.concat(
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this.getDataFromDom(
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childDomElement,
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[],
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childDataElement,
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path.concat( childDataElement.type ),
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wrapping || alreadyWrapped
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)
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);
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break;
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}
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// We don't know what this is, fall back to alien
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data = data.concat( createAlien( childDomElement, branchIsContent ) );
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break;
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case Node.TEXT_NODE:
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// HACK: strip trailing newlines in <li> tags. Workaround for a Parsoid bug
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var text = childDomElement.data;
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if ( domElement.nodeName.toLowerCase() === 'li' ) {
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text = text.replace( /\n+$/, '' );
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}
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if ( text === '' ) {
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// Don't produce an empty text node or an empty paragraph
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break;
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}
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// HACK: strip implied leading and trailing newlines in <p> tags
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// Workaround for a Parsoid bug
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/*
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* Leading newlines:
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* If the previous sibling is a paragraph, do not strip leading newlines
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* If there is no previous sibling, do not strip leading newlines
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* Otherwise, strip 1 leading newline
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*
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* Trailing newlines:
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* If the next sibling is a paragraph, strip 2 trailing newlines
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* If there is no next sibling, do not strip trailing newlines
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* Otherwise, strip 1 trailing newline
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*/
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var contentNode = childDomElement.parentNode;
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if ( contentNode.nodeName.toLowerCase() === 'p' ) {
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if (
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contentNode.previousSibling &&
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contentNode.previousSibling.nodeName.toLowerCase() !== 'p' &&
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text.charAt( 0 ) === '\n'
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) {
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text = text.substr( 1 );
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}
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if ( contentNode.nextSibling ) {
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// Strip one trailing newline
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if ( text.charAt( text.length - 1 ) === "\n" ) {
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text = text.substr( 0, text.length - 1 );
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}
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if ( contentNode.nextSibling.nodeName.toLowerCase() === 'p' ) {
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// Strip another one
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if ( text.charAt( text.length - 1 ) === "\n" ) {
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text = text.substr( 0, text.length - 1 );
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}
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}
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}
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}
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if ( !branchIsContent ) {
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// If it's bare content, strip leading and trailing newlines
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text = text.replace( /^\n+/, '' ).replace( /\n+$/, '' );
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if ( text === '' ) {
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// Don't produce an empty text node
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break;
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}
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}
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// Start auto-wrapping of bare content
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if ( !wrapping && !alreadyWrapped && !branchIsContent ) {
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data.push( { 'type': 'paragraph' } );
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wrapping = true;
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}
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// Annotate the text and output it
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data = data.concat(
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ve.dm.Converter.getDataContentFromText( text, annotations )
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);
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break;
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case Node.COMMENT_NODE:
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// TODO: Preserve comments by inserting them into the linear model too
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break;
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}
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}
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// End auto-wrapping of bare content
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if ( wrapping ) {
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data.push( { 'type': '/paragraph' } );
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}
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// Close element
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if ( dataElement ) {
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data.push( { 'type': '/' + dataElement.type } );
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}
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return data;
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};
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/**
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* Convert linear model data to an HTML DOM
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*
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* @method
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* @param {Array} data Linear model data
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* @returns {HTMLElement} Wrapper div containing the resulting HTML
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*/
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ve.dm.Converter.prototype.getDomFromData = function( data ) {
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function fixupText( text, node ) {
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// HACK reintroduce newlines needed to make Parsoid not freak out
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// This reverses the newline stripping done in getDataFromDom()
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/*
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* Leading newlines:
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* If the previous sibling is a heading, add 1 leading newline
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* Otherwise, do not add any leading newlines
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*
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* Trailing newlines:
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* If the next sibling is a paragraph, add 2 trailing newlines
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* If there is no next sibling, do not add any trailing newlines
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* Otherwise, add 1 trailing newline
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*/
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if ( node.nodeName.toLowerCase() === 'p' ) {
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if (
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node.previousSibling &&
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node.previousSibling.nodeName.toLowerCase().match( /h\d/ )
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) {
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text = "\n" + text;
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}
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if ( node.nextSibling ) {
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// Add one trailing newline
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text += "\n";
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if ( node.nextSibling.nodeName.toLowerCase() === 'p' ) {
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// Add another one
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text += "\n";
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}
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}
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}
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return text;
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}
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var container = document.createElement( 'div' ),
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domElement = container,
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text;
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for ( var i = 0; i < data.length; i++ ) {
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if ( typeof data[i] === 'string' ) {
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// Text
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text = '';
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// Continue forward as far as the plain text goes
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while ( typeof data[i] === 'string' ) {
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text += data[i];
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i++;
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}
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// i points to the first non-text thing, go back one so we don't skip this later
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i--;
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// Add text
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domElement.appendChild( document.createTextNode( text ) );
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} else if (
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ve.isArray( data[i] ) ||
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(
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data[i].annotations !== undefined &&
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ve.dm.nodeFactory.isNodeContent( data[i].type )
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)
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) {
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// Annotated text
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var annotations,
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annotationStack = {}, // { hash: DOMnode }
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hash,
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annotationElement,
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done;
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text = '';
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while (
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ve.isArray( data[i] ) ||
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(
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data[i].annotations !== undefined &&
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ve.dm.nodeFactory.isNodeContent( data[i].type )
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)
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) {
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annotations = data[i].annotations || data[i][1];
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// Check for closed annotations
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for ( hash in annotationStack ) {
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if ( !( hash in annotations ) ) {
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// It's closed
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// Traverse up until we hit the node we need to close, and then
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// traverse up one more time to close that node
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done = false;
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while ( !done ) {
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done = domElement === annotationStack[hash];
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// Remove the annotation from the stack
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delete annotationStack[domElement.veAnnotationHash];
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// Remove the temporary veAnnotationHash property
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delete domElement.veAnnotationHash;
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// Add text if needed
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if ( text.length > 0 ) {
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domElement.appendChild( document.createTextNode( text ) );
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text = '';
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}
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// Traverse up
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domElement = domElement.parentNode;
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}
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}
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}
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// Check for opened annotations
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for ( hash in annotations ) {
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if ( !( hash in annotationStack ) ) {
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// It's opened
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annotationElement = this.getDomElementFromDataAnnotation( annotations[hash] );
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// Temporary property, will remove this when closing the annotation
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annotationElement.veAnnotationHash = hash;
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// Add to the annotation stack
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annotationStack[hash] = annotationElement;
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// Add text if needed
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if ( text.length > 0 ) {
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domElement.appendChild( document.createTextNode( text ) );
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text = '';
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}
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// Attach new node and descend into it
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domElement.appendChild( annotationElement );
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domElement = annotationElement;
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}
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}
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if ( data[i].annotations === undefined ) {
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text += data[i][0];
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} else {
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|
// Add text if needed
|
|
if ( text.length > 0 ) {
|
|
domElement.appendChild( document.createTextNode( text ) );
|
|
text = '';
|
|
}
|
|
// Insert the element
|
|
domElement.appendChild( this.getDomElementFromDataElement( data[i] ) );
|
|
// Increment i once more so we skip over the closing as well
|
|
i++;
|
|
}
|
|
i++;
|
|
}
|
|
// We're now at the first non-annotated thing, go back one so we don't skip this later
|
|
i--;
|
|
|
|
// Add any gathered text
|
|
if ( text.length > 0 ) {
|
|
domElement.appendChild( document.createTextNode( text ) );
|
|
text = '';
|
|
}
|
|
// Close any remaining annotation nodes
|
|
while ( domElement.veAnnotationHash !== undefined ) {
|
|
delete domElement.veAnnotationHash;
|
|
domElement = domElement.parentNode;
|
|
}
|
|
} else if ( data[i].type !== undefined ) {
|
|
var dataElement = data[i];
|
|
// Element
|
|
if ( dataElement.type === 'alienBlock' || dataElement.type === 'alienInline' ) {
|
|
// Create nodes from source
|
|
var wrapper = document.createElement( 'div' );
|
|
wrapper.innerHTML = dataElement.attributes.html;
|
|
// Add element - adds all child elements, but there really should only be 1
|
|
while ( wrapper.firstChild ) {
|
|
domElement.appendChild( wrapper.firstChild );
|
|
}
|
|
// Make sure the alien closing is skipped
|
|
i++;
|
|
} else if ( dataElement.type.charAt( 0 ) === '/' ) {
|
|
// Ascend to parent node
|
|
domElement = domElement.parentNode;
|
|
} else {
|
|
// Create node from data
|
|
var childDomElement = this.getDomElementFromDataElement( dataElement );
|
|
// Add element
|
|
domElement.appendChild( childDomElement );
|
|
// Descend into child node
|
|
domElement = childDomElement;
|
|
}
|
|
}
|
|
}
|
|
|
|
// HACK: do postprocessing on the data to work around bugs in Parsoid concerning paragraphs
|
|
// inside list items
|
|
$( container ).find( 'li, dd, dt' ).each( function() {
|
|
var $sublists = $(this).children( 'ul, ol' ),
|
|
$firstChild = $(this.firstChild);
|
|
if ( $firstChild.is( 'p' ) ) {
|
|
// Unwrap the first paragraph, unless it has stx=html
|
|
var datamw = $.parseJSON( $firstChild.attr( 'data-mw' ) ) || {};
|
|
if ( datamw.stx !== 'html' ) {
|
|
$firstChild.replaceWith( $firstChild.contents() );
|
|
}
|
|
}
|
|
|
|
// Append a newline to the end of the <li> , provided its last child is not a list
|
|
var lastChildNodeName = this.lastChild.nodeName.toLowerCase();
|
|
if ( lastChildNodeName !== 'ul' && lastChildNodeName !== 'ol' ) {
|
|
$(this).append( "\n" );
|
|
}
|
|
// Append a newline before every sublist that is preceded by something
|
|
$sublists.each( function() {
|
|
if ( this.previousSibling ) {
|
|
if ( this.previousSibling.nodeName.toLowerCase() === 'text' ) {
|
|
this.previousSibling.data += "\n";
|
|
} else {
|
|
this.parentNode.insertBefore( document.createTextNode( "\n" ), this );
|
|
}
|
|
}
|
|
});
|
|
});
|
|
|
|
// HACK more postprocessing, this time to add newlines to paragraphs so Parsoid doesn't freak out
|
|
$( container )
|
|
// Get all text nodes
|
|
.find( '*' )
|
|
.contents()
|
|
.filter( function() {
|
|
return this.nodeType == 3;
|
|
} )
|
|
.each( function() {
|
|
this.data = fixupText( this.data, this.parentNode );
|
|
} );
|
|
// And add newlines after headings too
|
|
$( container ).find( 'h1, h2, h3, h4, h5, h6' ).each( function() {
|
|
// If there is no next sibling, we don't need to add a newline
|
|
// If the next sibling is a paragraph, fixupText() has taken care of it
|
|
// Otherwise, add a newline after the heading
|
|
if ( this.nextSibling && this.nextSibling.nodeName.toLowerCase() !== 'p' ) {
|
|
this.parentNode.insertBefore( document.createTextNode( "\n" ), this.nextSibling );
|
|
}
|
|
// If the previous sibling exists and is a pre, we need to add a newline before
|
|
if ( this.previousSibling && this.previousSibling.nodeName.toLowerCase() === 'pre' ) {
|
|
this.parentNode.insertBefore( document.createTextNode( "\n" ), this );
|
|
}
|
|
} );
|
|
return container;
|
|
};
|
|
|
|
/* Initialization */
|
|
|
|
ve.dm.converter = new ve.dm.Converter( ve.dm.nodeFactory, ve.dm.annotationFactory );
|