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ve.Node.js
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ve.Node.js
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/*!
* VisualEditor Node class.
*
* @copyright See AUTHORS.txt
*/
/**
* Generic node.
*
* @abstract
* @mixes OO.EventEmitter
*
* @constructor
*/
ve.Node = function VeNode() {
// Properties
this.type = this.constructor.static.name;
this.parent = null;
this.root = null;
this.doc = null;
};
/**
* @event ve.Node#attach
* @param {ve.Node} New parent
*/
/**
* @event ve.Node#detach
* @param {ve.Node} Old parent
*/
/**
* The node has a new root assigned.
*
* The root will be consistent with that set in descendants and ancestors, but other parts of the
* tree may be inconsistent.
*
* @event ve.Node#root
* @param {ve.Node} New root
*/
/**
* The node root has been set to null.
*
* The root will be consistent with that set in descendants and ancestors, but other parts of the
* tree may be inconsistent.
*
* @event ve.Node#unroot
* @param {ve.Node} Old root
*/
/* Abstract Methods */
/**
* Get allowed child node types.
*
* @abstract
* @return {string[]|null} List of node types allowed as children or null if any type is allowed
*/
ve.Node.prototype.getChildNodeTypes = null;
/**
* Get allowed parent node types.
*
* @abstract
* @return {string[]|null} List of node types allowed as parents or null if any type is allowed
*/
ve.Node.prototype.getParentNodeTypes = null;
/**
* Check if the specified type is an allowed child node type
*
* @param {string} type Node type
* @return {boolean} The type is allowed
*/
ve.Node.prototype.isAllowedChildNodeType = function ( type ) {
const childTypes = this.getChildNodeTypes();
return childTypes === null || childTypes.indexOf( type ) !== -1;
};
/**
* Check if the specified type is an allowed child node type
*
* @param {string} type Node type
* @return {boolean} The type is allowed
*/
ve.Node.prototype.isAllowedParentNodeType = function ( type ) {
const parentTypes = this.getParentNodeTypes();
return parentTypes === null || parentTypes.indexOf( type ) !== -1;
};
/**
* Get suggested parent node types.
*
* @abstract
* @return {string[]|null} List of node types suggested as parents or null if any type is suggested
*/
ve.Node.prototype.getSuggestedParentNodeTypes = null;
/**
* Check if the node can have children.
*
* @abstract
* @return {boolean} Node can have children
*/
ve.Node.prototype.canHaveChildren = null;
/**
* Check if the node can have children but not content nor be content.
*
* @abstract
* @return {boolean} Node can have children but not content nor be content
*/
ve.Node.prototype.canHaveChildrenNotContent = null;
/**
* Check if the node can contain content.
*
* @abstract
* @return {boolean} Node can contain content
*/
ve.Node.prototype.canContainContent = null;
/**
* Check if the node is content.
*
* @abstract
* @return {boolean} Node is content
*/
ve.Node.prototype.isContent = null;
/**
* Check if the node is an internal node
*
* @abstract
* @return {boolean} Node is an internal node
*/
ve.Node.prototype.isInternal = null;
/**
* Check if the node is a meta data node
*
* @abstract
* @return {boolean} Node is a meta data node
*/
ve.Node.prototype.isMetaData = null;
/**
* Check if the node has a wrapped element in the document data.
*
* @abstract
* @return {boolean} Node represents a wrapped element
*/
ve.Node.prototype.isWrapped = null;
/**
* Check if the node can be unwrapped.
*
* Can only be true of the node is wrapped.
*
* @abstract
* @return {boolean} Node represents a unwrappable element
*/
ve.Node.prototype.isUnwrappable = null;
/**
* Check if the node is focusable
*
* @abstract
* @return {boolean} Node is focusable
*/
ve.Node.prototype.isFocusable = null;
/**
* Check if the node is alignable
*
* @abstract
* @return {boolean} Node is alignable
*/
ve.Node.prototype.isAlignable = null;
/**
* Check if the node can behave as a table cell
*
* @abstract
* @return {boolean} Node can behave as a table cell
*/
ve.Node.prototype.isCellable = null;
/**
* Check the node, behaving as a table cell, can be edited in place
*
* @abstract
* @return {boolean} Node can be edited in place
*/
ve.Node.prototype.isCellEditable = null;
/**
* Check if the node behaves like a list for diffing
*
* @abstract
* @return {boolean} Node behaves like a list
*/
ve.Node.prototype.isDiffedAsList = null;
/**
* Check if the node behaves like a leaf for diffing
*
* @abstract
* @return {boolean} Node behaves like a leaf
*/
ve.Node.prototype.isDiffedAsLeaf = null;
/**
* Check if the node behaves like a document for diffing
*
* @abstract
* @return {boolean} Node behaves like a document
*/
ve.Node.prototype.isDiffedAsDocument = null;
/**
* Check if the node behaves like a tree branch for diffing
*
* This is the fallback behaviour if the node is not diffed as
* a list,leaf or document.
*
* @abstract
* @return {boolean} Node behaves like a tree branch
*/
ve.Node.prototype.isDiffedAsTree = function () {
return !this.isDiffedAsList() && !this.isDiffedAsLeaf() && !this.isDiffedAsDocument();
};
/**
* Check if the node has significant whitespace.
*
* Can only be true if canContainContent is also true.
*
* @abstract
* @return {boolean} Node has significant whitespace
*/
ve.Node.prototype.hasSignificantWhitespace = null;
/**
* Check if the node handles its own children
*
* @abstract
* @return {boolean} Node handles its own children
*/
ve.Node.prototype.handlesOwnChildren = null;
/**
* Check if the node's children should be ignored.
*
* @abstract
* @return {boolean} Node's children should be ignored
*/
ve.Node.prototype.shouldIgnoreChildren = null;
/**
* Get the length of the node.
*
* @abstract
* @return {number} Node length
*/
ve.Node.prototype.getLength = null;
/**
* Get the offset of the node within the document.
*
* If the node has no parent than the result will always be 0.
*
* @abstract
* @return {number} Offset of node
* @throws {Error} Node not found in parent's children array
*/
ve.Node.prototype.getOffset = null;
/**
* Get the range inside the node.
*
* @param {boolean} backwards Return a backwards range
* @return {ve.Range} Inner node range
*/
ve.Node.prototype.getRange = function ( backwards ) {
const offset = this.getOffset() + ( this.isWrapped() ? 1 : 0 ),
range = new ve.Range( offset, offset + this.getLength() );
return backwards ? range.flip() : range;
};
/**
* Get the outer range of the node, which includes wrappers if present.
*
* @param {boolean} backwards Return a backwards range
* @return {ve.Range} Node outer range
*/
ve.Node.prototype.getOuterRange = function ( backwards ) {
const range = new ve.Range( this.getOffset(), this.getOffset() + this.getOuterLength() );
return backwards ? range.flip() : range;
};
/**
* Get the outer length of the node, which includes wrappers if present.
*
* @return {number} Node outer length
*/
ve.Node.prototype.getOuterLength = function () {
return this.getLength() + ( this.isWrapped() ? 2 : 0 );
};
/* Methods */
/**
* Get the symbolic node type name.
*
* @return {string} Symbolic name of element type
*/
ve.Node.prototype.getType = function () {
return this.type;
};
/**
* Get a reference to the node's parent.
*
* @return {ve.Node|null} Reference to the node's parent, null if detached
*/
ve.Node.prototype.getParent = function () {
return this.parent;
};
/**
* Get the root node of the tree the node is currently attached to.
*
* @return {ve.Node|null} Root node, null if detached
*/
ve.Node.prototype.getRoot = function () {
return this.root;
};
/**
* Set the root node.
*
* This method is overridden by nodes with children.
*
* @param {ve.Node|null} root Node to use as root
* @fires ve.Node#root
* @fires ve.Node#unroot
*/
ve.Node.prototype.setRoot = function ( root ) {
const oldRoot = this.root;
if ( root === oldRoot ) {
return;
}
if ( oldRoot ) {
this.root = null;
this.emit( 'unroot', oldRoot );
}
this.root = root;
if ( root ) {
this.emit( 'root', root );
}
};
/**
* Get the document the node is a part of.
*
* @return {ve.Document|null} Document the node is a part of, null if detached
*/
ve.Node.prototype.getDocument = function () {
return this.doc;
};
/**
* Set the document the node is a part of.
*
* This method is overridden by nodes with children.
*
* @param {ve.Document|null} doc Document this node is a part of
*/
ve.Node.prototype.setDocument = function ( doc ) {
const oldDoc = this.doc;
if ( doc === oldDoc ) {
return;
}
if ( oldDoc ) {
this.doc = null;
oldDoc.nodeDetached( this );
}
this.doc = doc;
if ( doc ) {
doc.nodeAttached( this );
}
};
/**
* Attach the node to another as a child.
*
* @param {ve.Node} parent Node to attach to
* @fires ve.Node#attach
*/
ve.Node.prototype.attach = function ( parent ) {
this.parent = parent;
this.setDocument( parent.getDocument() );
this.setRoot( parent.getRoot() );
this.emit( 'attach', parent );
};
/**
* Detach the node from its parent.
*
* @fires ve.Node#detach
*/
ve.Node.prototype.detach = function () {
const parent = this.parent;
this.parent = null;
this.setRoot( null );
this.setDocument( null );
this.emit( 'detach', parent );
};
/**
* Traverse tree of nodes (model or view) upstream.
*
* For each traversed node, the callback function will be passed the traversed node as a parameter.
*
* @param {Function} callback Callback method to be called for every traversed node. Returning false stops the traversal.
* @return {ve.Node|null} Node which caused the traversal to stop, or null if it didn't
*/
ve.Node.prototype.traverseUpstream = function ( callback ) {
let node = this;
while ( node ) {
if ( callback( node ) === false ) {
return node;
}
node = node.getParent();
}
return null;
};
/**
* Traverse upstream until a parent of a specific type is found
*
* @param {Function} type Node type to find
* @return {ve.Node|null} Ancestor of this node matching the specified type
*/
ve.Node.prototype.findParent = function ( type ) {
return this.traverseUpstream( ( node ) => !( node instanceof type ) );
};
/**
* Traverse upstream and collect all nodes, including the node itself.
*
* @return {ve.Node[]} List of nodes which are upstream of the current node
*/
ve.Node.prototype.collectUpstream = function () {
const nodes = [];
this.traverseUpstream( ( node ) => {
nodes.push( node );
} );
return nodes;
};
/**
* Check if the current node is a descendant of (or equal to) a specific node.
*
* @param {ve.Node} upstreamNode Parent node to check for
* @return {boolean} Current node is a descendant
*/
ve.Node.prototype.isDownstreamOf = function ( upstreamNode ) {
return this.traverseUpstream( ( node ) => node !== upstreamNode ) !== null;
};
/**
* Get the offset path from the document node to this node.
*
* @return {number[]|null} The offset path, or null if not attached to a DocumentNode
*/
ve.Node.prototype.getOffsetPath = function () {
let node = this;
const path = [];
while ( true ) {
if ( node.type === 'document' ) {
// We reached the ve.dm.DocumentNode/ve.ce.DocumentNode that this node is attached to
return path;
}
const parent = node.getParent();
if ( !parent ) {
return null;
}
path.unshift( parent.indexOf( node ) );
node = parent;
}
};

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