mediawiki-extensions-Visual.../modules/ve2/dm/ve.dm.Converter.js

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