mediawiki-extensions-Visual.../modules/ve/dm/ve.dm.Node.js
Ed Sanders 6ad61d4ddb Add data model support for MediaWiki references
So far just read-only.

Bug: 39599
Change-Id: I6daff5c5969e5fdc871f8f346cf790b4302ae080
2013-04-23 10:17:42 +01:00

514 lines
13 KiB
JavaScript

/*!
* VisualEditor DataModel Node class.
*
* @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
* @license The MIT License (MIT); see LICENSE.txt
*/
/**
* Generic DataModel node.
*
* @abstract
* @extends ve.dm.Model
* @mixins ve.Node
*
* @constructor
* @param {number} [length] Length of content data in document
* @param {Object} [element] Reference to element in linear model
*/
ve.dm.Node = function VeDmNode( length, element ) {
// Parent constructor
ve.dm.Model.call( this, element );
// Mixin constructor
ve.Node.call( this );
// Properties
this.length = length || 0;
this.element = element;
this.doc = undefined;
};
/**
* @event lengthChange
* @param diff
*/
/**
* @event update
*/
/* Inheritance */
ve.inheritClass( ve.dm.Node, ve.dm.Model );
ve.mixinClass( ve.dm.Node, ve.Node );
/* Static Properties */
/**
* Whether this node handles its own children. After converting a DOM node to a linear model
* node of this type, the converter checks this property. If it's false, the converter will descend
* into the DOM node's children, recursively convert them, and attach the resulting nodes as
* children of the linear model node. If it's true, the converter will not descend, and will
* expect the node's toDataElement() to have handled the entire DOM subtree.
*
* The same is true when converting from linear model data to DOM: if this property is true,
* toDomElements() will be passed the node's data element and all of its children and will be
* expected to convert the entire subtree. If it's false, the converter will descend into the
* child nodes and convert each one individually.
*
* If .static.childNodeTypes is set to [], this property is ignored and will be assumed to be true.
*
* @static
* @type {boolean} static.handlesOwnChildren
* @inheritable
*/
ve.dm.Node.static.handlesOwnChildren = false;
/**
* Whether this node type is internal. Internal node types are ignored by the converter.
*
* @static
* @property {boolean} static.isInternal
* @inheritable
*/
ve.dm.Node.static.isInternal = false;
/**
* Whether this node type has a wrapping element in the linear model. Most node types are wrapped,
* only special node types are not wrapped.
*
* @static
* @property {boolean} static.isWrapped
* @inheritable
*/
ve.dm.Node.static.isWrapped = true;
/**
* Whether this node type is a content node type. This means the node represents content, cannot
* have children, and can only appear as children of a content container node. Content nodes are
* also known as inline nodes.
*
* @static
* @property {boolean} static.isContent
* @inheritable
*/
ve.dm.Node.static.isContent = false;
/**
* Whether this node type can contain content. The children of content container nodes must be
* content nodes.
*
* @static
* @property {boolean} static.canContainContent
* @inheritable
*/
ve.dm.Node.static.canContainContent = false;
/**
* Whether this node type has significant whitespace. Only applies to content container nodes
* (i.e. can only be true if canContainContent is also true).
*
* If a content node has significant whitespace, the text inside it is not subject to whitespace
* stripping and preservation.
*
* @static
* @property {boolean} static.hasSignificantWhitespace
* @inheritable
*/
ve.dm.Node.static.hasSignificantWhitespace = false;
/**
* Array of allowed child node types for this node type.
*
* An empty array means no children are allowed. null means any node type is allowed as a child.
*
* @static
* @property {string[]|null} static.childNodeTypes
* @inheritable
*/
ve.dm.Node.static.childNodeTypes = null;
/**
* Array of allowed parent node types for this node type.
*
* An empty array means this node type cannot be the child of any node. null means this node type
* can be the child of any node type.
*
* @static
* @property {string[]|null} static.parentNodeTypes
* @inheritable
*/
ve.dm.Node.static.parentNodeTypes = null;
/**
* Array of suggested parent node types for this node type.
*
* These parent node types are allowed but the editor will avoid creating them.
*
* An empty array means this node type should not be the child of any node. null means this node type
* can be the child of any node type.
*
* @static
* @property {string[]|null} static.suggestedParentNodeTypes
* @inheritable
*/
ve.dm.Node.static.suggestedParentNodeTypes = null;
/**
* Default attributes to set for newly created linear model elements. These defaults will be used
* when creating a new element in ve.dm.NodeFactory#getDataElement when there is no DOM node or
* existing linear model element to base the attributes on.
*
* This property is an object with attribute names as keys and attribute values as values.
* Attributes may be omitted, in which case they'll simply be undefined.
*
* @static
* @property {Object} static.defaultAttributes
* @inheritable
*/
ve.dm.Node.static.defaultAttributes = {};
/**
* Get hash object of a linear model data element
*
* @static
* @param {Object} dataElement Data element
* @returns {Object} Hash object
*/
ve.dm.Node.static.getHashObject = function ( dataElement ) {
return {
type: dataElement.type,
attributes: dataElement.attributes
};
};
/**
* Determine if a hybrid element is inline and allowed to be inline in this context
*
* We generate block elements for block tags and inline elements for inline
* tags; unless we're in a content location, in which case we have no choice
* but to generate an inline element.
*
* @param {HTMLElement[]} domElements DOM elements being converted
* @param {ve.dm.Converter} converter Converter object
* @returns {boolean} The element is inline
*/
ve.dm.Node.static.isHybridInline = function ( domElements, converter ) {
var i, length, allTagsInline = true;
for ( i = 0, length = domElements.length; i < length; i++ ) {
if ( ve.isBlockElement( domElements[i] ) ) {
allTagsInline = false;
break;
}
}
// Force inline in content locations (but not wrappers)
return ( converter.isExpectingContent() && !converter.isInWrapper() ) ||
// ..also force inline in wrappers that we can't close
( converter.isInWrapper() && !converter.canCloseWrapper() ) ||
// ..otherwise just look at the tag names
allTagsInline;
};
/* Methods */
/**
* Get a clone of the node's document data element.
*
* The attributes object will be deep-copied, and the .internal.generated property will be removed,
* if present. Any html/* attributes will be removed as well.
*
* @returns {Object} Cloned element object
*/
ve.dm.Node.prototype.getClonedElement = function () {
var attr, clone = ve.copyObject( this.element );
if ( clone.internal ) {
delete clone.internal.generated;
if ( ve.isEmptyObject( clone.internal ) ) {
delete clone.internal;
}
}
if ( this.element.attributes ) {
for ( attr in this.element.attributes ) {
if ( attr.substr( 0, 5 ) === 'html/' ) {
delete clone.attributes[attr];
}
}
if ( ve.isEmptyObject( clone.attributes ) ) {
delete clone.attributes;
}
}
return clone;
};
/**
* Get allowed child node types.
*
* @method
* @returns {string[]|null} List of node types allowed as children or null if any type is allowed
*/
ve.dm.Node.prototype.getChildNodeTypes = function () {
return this.constructor.static.childNodeTypes;
};
/**
* Get allowed parent node types.
*
* @method
* @returns {string[]|null} List of node types allowed as parents or null if any type is allowed
*/
ve.dm.Node.prototype.getParentNodeTypes = function () {
return this.constructor.static.parentNodeTypes;
};
/**
* Get suggested parent node types.
*
* @method
* @returns {string[]|null} List of node types suggested as parents or null if any type is suggested
*/
ve.dm.Node.prototype.getSuggestedParentNodeTypes = function () {
return this.constructor.static.suggestedParentNodeTypes;
};
/**
* Check if the node can have children.
*
* @method
* @returns {boolean} Node can have children
*/
ve.dm.Node.prototype.canHaveChildren = function () {
return ve.dm.nodeFactory.canNodeHaveChildren( this.type );
};
/**
* Check if the node can have children but not content nor be content.
*
* @method
* @returns {boolean} Node can have children but not content nor be content
*/
ve.dm.Node.prototype.canHaveChildrenNotContent = function () {
return ve.dm.nodeFactory.canNodeHaveChildrenNotContent( this.type );
};
/**
* Check if the node has a wrapped element in the document data.
*
* @method
* @returns {boolean} Node represents a wrapped element
*/
ve.dm.Node.prototype.isWrapped = function () {
return this.constructor.static.isWrapped;
};
/**
* Check if the node can contain content.
*
* @method
* @returns {boolean} Node can contain content
*/
ve.dm.Node.prototype.canContainContent = function () {
return this.constructor.static.canContainContent;
};
/**
* Check if the node is content.
*
* @method
* @returns {boolean} Node is content
*/
ve.dm.Node.prototype.isContent = function () {
return this.constructor.static.isContent;
};
/**
* Check if the node has significant whitespace.
*
* Can only be true if canContainContent is also true.
*
* @method
* @returns {boolean} Node has significant whitespace
*/
ve.dm.Node.prototype.hasSignificantWhitespace = function () {
return this.constructor.static.hasSignificantWhitespace;
};
/**
* Check if the node has an ancestor with matching type and attribute values.
*
* @method
* @returns {boolean} Node is content
*/
ve.dm.Node.prototype.hasMatchingAncestor = function ( type, attributes ) {
var key,
node = this;
// Traverse up to matching node
while ( node && node.getType() !== type ) {
node = node.getParent();
// Stop at root
if ( node === null ) {
return false;
}
}
// Check attributes
if ( attributes ) {
for ( key in attributes ) {
if ( node.getAttribute( key ) !== attributes[key] ) {
return false;
}
}
}
return true;
};
/**
* Get the length of the node.
*
* @method
* @returns {number} Length of the node's contents
*/
ve.dm.Node.prototype.getLength = function () {
return this.length;
};
/**
* Get the outer length of the node, which includes wrappers if present.
*
* @method
* @returns {number} Length of the entire node
*/
ve.dm.Node.prototype.getOuterLength = function () {
return this.length + ( this.isWrapped() ? 2 : 0 );
};
/**
* Get the range inside the node.
*
* @method
* @returns {ve.Range} Inner node range
*/
ve.dm.Node.prototype.getRange = function () {
var offset = this.getOffset();
if ( this.isWrapped() ) {
offset++;
}
return new ve.Range( offset, offset + this.length );
};
/**
* Get the range outside the node.
*
* @method
* @returns {ve.Range} Outer node range
*/
ve.dm.Node.prototype.getOuterRange = function () {
var offset = this.getOffset();
return new ve.Range( offset, offset + this.getOuterLength() );
};
/**
* Set the inner length of the node.
*
* This should only be called after a relevant change to the document data. Calling this method will
* not change the document data.
*
* @method
* @param {number} length Length of content
* @emits lengthChange
* @emits update
* @throws {Error} Invalid content length error if length is less than 0
*/
ve.dm.Node.prototype.setLength = function ( length ) {
if ( length < 0 ) {
throw new Error( 'Length cannot be negative' );
}
// Compute length adjustment from old length
var diff = length - this.length;
// Set new length
this.length = length;
// Adjust the parent's length
if ( this.parent ) {
this.parent.adjustLength( diff );
}
// Emit events
this.emit( 'lengthChange', diff );
this.emit( 'update' );
};
/**
* Adjust the length.
*
* This should only be called after a relevant change to the document data. Calling this method will
* not change the document data.
*
* @method
* @param {number} adjustment Amount to adjust length by
* @emits lengthChange
* @emits update
* @throws {Error} Invalid adjustment error if resulting length is less than 0
*/
ve.dm.Node.prototype.adjustLength = function ( adjustment ) {
this.setLength( this.length + adjustment );
};
/**
* Get the offset of the node within the document.
*
* If the node has no parent than the result will always be 0.
*
* @method
* @returns {number} Offset of node
*/
ve.dm.Node.prototype.getOffset = function () {
return this.root === this ? 0 : this.root.getOffsetFromNode( this );
};
/**
* Check if the node can be merged with another.
*
* For two nodes to be mergeable, the two nodes must either be the same node or:
* - Have the same type
* - Have the same depth
* - Have similar ancestory (each node upstream must have the same type)
*
* @method
* @param {ve.dm.Node} node Node to consider merging with
* @returns {boolean} Nodes can be merged
*/
ve.dm.Node.prototype.canBeMergedWith = function ( node ) {
var n1 = this,
n2 = node;
// Move up from n1 and n2 simultaneously until we find a common ancestor
while ( n1 !== n2 ) {
if (
// Check if we have reached a root (means there's no common ancestor or unequal depth)
( n1 === null || n2 === null ) ||
// Ensure that types match
n1.getType() !== n2.getType()
) {
return false;
}
// Move up
n1 = n1.getParent();
n2 = n2.getParent();
}
return true;
};
/**
* Get the hash object of the node.
*
* The actual logic is in a static function as this needs
* to be accessible from ve.dm.Converter
*
* This is a custom hash function for ve#getHash.
*
* @method
* @returns {Object} Hash object
*/
ve.dm.Node.prototype.getHashObject = function () {
return this.constructor.static.getHashObject( this.element );
};