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838 lines
29 KiB
838 lines
29 KiB
'use strict';
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/**
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* @module symbol-tree
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* @author Joris van der Wel <joris@jorisvanderwel.com>
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*/
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const SymbolTreeNode = require('./SymbolTreeNode');
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const TreePosition = require('./TreePosition');
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const TreeIterator = require('./TreeIterator');
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function returnTrue() {
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return true;
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}
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function reverseArrayIndex(array, reverseIndex) {
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return array[array.length - 1 - reverseIndex]; // no need to check `index >= 0`
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}
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class SymbolTree {
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/**
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* @constructor
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* @alias module:symbol-tree
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* @param {string} [description='SymbolTree data'] Description used for the Symbol
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*/
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constructor(description) {
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this.symbol = Symbol(description || 'SymbolTree data');
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}
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/**
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* You can use this function to (optionally) initialize an object right after its creation,
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* to take advantage of V8's fast properties. Also useful if you would like to
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* freeze your object.
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*
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* `O(1)`
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*
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* @method
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* @alias module:symbol-tree#initialize
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* @param {Object} object
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* @return {Object} object
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*/
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initialize(object) {
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this._node(object);
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return object;
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}
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_node(object) {
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if (!object) {
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return null;
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}
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const node = object[this.symbol];
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if (node) {
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return node;
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}
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return (object[this.symbol] = new SymbolTreeNode());
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}
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/**
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* Returns `true` if the object has any children. Otherwise it returns `false`.
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*
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* * `O(1)`
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*
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* @method hasChildren
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Boolean}
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*/
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hasChildren(object) {
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return this._node(object).hasChildren;
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}
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/**
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* Returns the first child of the given object.
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*
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* * `O(1)`
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*
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* @method firstChild
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object}
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*/
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firstChild(object) {
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return this._node(object).firstChild;
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}
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/**
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* Returns the last child of the given object.
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*
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* * `O(1)`
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*
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* @method lastChild
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object}
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*/
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lastChild(object) {
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return this._node(object).lastChild;
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}
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/**
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* Returns the previous sibling of the given object.
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*
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* * `O(1)`
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*
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* @method previousSibling
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object}
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*/
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previousSibling(object) {
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return this._node(object).previousSibling;
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}
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/**
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* Returns the next sibling of the given object.
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*
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* * `O(1)`
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*
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* @method nextSibling
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object}
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*/
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nextSibling(object) {
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return this._node(object).nextSibling;
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}
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/**
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* Return the parent of the given object.
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*
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* * `O(1)`
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*
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* @method parent
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object}
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*/
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parent(object) {
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return this._node(object).parent;
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}
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/**
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* Find the inclusive descendant that is last in tree order of the given object.
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*
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* * `O(n)` (worst case) where `n` is the depth of the subtree of `object`
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*
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* @method lastInclusiveDescendant
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object}
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*/
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lastInclusiveDescendant(object) {
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let lastChild;
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let current = object;
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while ((lastChild = this._node(current).lastChild)) {
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current = lastChild;
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}
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return current;
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}
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/**
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* Find the preceding object (A) of the given object (B).
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* An object A is preceding an object B if A and B are in the same tree
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* and A comes before B in tree order.
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*
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* * `O(n)` (worst case)
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* * `O(1)` (amortized when walking the entire tree)
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*
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* @method preceding
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @param {Object} [options]
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* @param {Object} [options.root] If set, `root` must be an inclusive ancestor
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* of the return value (or else null is returned). This check _assumes_
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* that `root` is also an inclusive ancestor of the given `object`
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* @return {?Object}
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*/
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preceding(object, options) {
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const treeRoot = options && options.root;
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if (object === treeRoot) {
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return null;
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}
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const previousSibling = this._node(object).previousSibling;
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if (previousSibling) {
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return this.lastInclusiveDescendant(previousSibling);
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}
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// if there is no previous sibling return the parent (might be null)
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return this._node(object).parent;
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}
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/**
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* Find the following object (A) of the given object (B).
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* An object A is following an object B if A and B are in the same tree
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* and A comes after B in tree order.
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*
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* * `O(n)` (worst case) where `n` is the amount of objects in the entire tree
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* * `O(1)` (amortized when walking the entire tree)
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*
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* @method following
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* @memberOf module:symbol-tree#
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* @param {!Object} object
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* @param {Object} [options]
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* @param {Object} [options.root] If set, `root` must be an inclusive ancestor
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* of the return value (or else null is returned). This check _assumes_
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* that `root` is also an inclusive ancestor of the given `object`
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* @param {Boolean} [options.skipChildren=false] If set, ignore the children of `object`
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* @return {?Object}
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*/
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following(object, options) {
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const treeRoot = options && options.root;
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const skipChildren = options && options.skipChildren;
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const firstChild = !skipChildren && this._node(object).firstChild;
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if (firstChild) {
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return firstChild;
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}
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let current = object;
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do {
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if (current === treeRoot) {
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return null;
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}
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const nextSibling = this._node(current).nextSibling;
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if (nextSibling) {
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return nextSibling;
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}
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current = this._node(current).parent;
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} while (current);
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return null;
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}
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/**
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* Append all children of the given object to an array.
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*
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* * `O(n)` where `n` is the amount of children of the given `parent`
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*
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* @method childrenToArray
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* @memberOf module:symbol-tree#
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* @param {Object} parent
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* @param {Object} [options]
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* @param {Object[]} [options.array=[]]
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* @param {Function} [options.filter] Function to test each object before it is added to the array.
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* Invoked with arguments (object). Should return `true` if an object
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* is to be included.
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* @param {*} [options.thisArg] Value to use as `this` when executing `filter`.
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* @return {Object[]}
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*/
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childrenToArray(parent, options) {
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const array = (options && options.array) || [];
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const filter = (options && options.filter) || returnTrue;
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const thisArg = (options && options.thisArg) || undefined;
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const parentNode = this._node(parent);
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let object = parentNode.firstChild;
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let index = 0;
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while (object) {
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const node = this._node(object);
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node.setCachedIndex(parentNode, index);
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if (filter.call(thisArg, object)) {
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array.push(object);
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}
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object = node.nextSibling;
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++index;
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}
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return array;
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}
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/**
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* Append all inclusive ancestors of the given object to an array.
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*
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* * `O(n)` where `n` is the amount of ancestors of the given `object`
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*
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* @method ancestorsToArray
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @param {Object} [options]
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* @param {Object[]} [options.array=[]]
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* @param {Function} [options.filter] Function to test each object before it is added to the array.
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* Invoked with arguments (object). Should return `true` if an object
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* is to be included.
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* @param {*} [options.thisArg] Value to use as `this` when executing `filter`.
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* @return {Object[]}
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*/
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ancestorsToArray(object, options) {
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const array = (options && options.array) || [];
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const filter = (options && options.filter) || returnTrue;
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const thisArg = (options && options.thisArg) || undefined;
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let ancestor = object;
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while (ancestor) {
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if (filter.call(thisArg, ancestor)) {
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array.push(ancestor);
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}
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ancestor = this._node(ancestor).parent;
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}
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return array;
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}
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/**
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* Append all descendants of the given object to an array (in tree order).
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*
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* * `O(n)` where `n` is the amount of objects in the sub-tree of the given `object`
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*
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* @method treeToArray
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* @memberOf module:symbol-tree#
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* @param {Object} root
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* @param {Object} [options]
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* @param {Object[]} [options.array=[]]
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* @param {Function} [options.filter] Function to test each object before it is added to the array.
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* Invoked with arguments (object). Should return `true` if an object
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* is to be included.
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* @param {*} [options.thisArg] Value to use as `this` when executing `filter`.
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* @return {Object[]}
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*/
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treeToArray(root, options) {
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const array = (options && options.array) || [];
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const filter = (options && options.filter) || returnTrue;
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const thisArg = (options && options.thisArg) || undefined;
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let object = root;
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while (object) {
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if (filter.call(thisArg, object)) {
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array.push(object);
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}
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object = this.following(object, {root: root});
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}
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return array;
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}
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/**
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* Iterate over all children of the given object
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*
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* * `O(1)` for a single iteration
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*
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* @method childrenIterator
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* @memberOf module:symbol-tree#
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* @param {Object} parent
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* @param {Object} [options]
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* @param {Boolean} [options.reverse=false]
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* @return {Object} An iterable iterator (ES6)
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*/
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childrenIterator(parent, options) {
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const reverse = options && options.reverse;
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const parentNode = this._node(parent);
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return new TreeIterator(
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this,
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parent,
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reverse ? parentNode.lastChild : parentNode.firstChild,
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reverse ? TreeIterator.PREV : TreeIterator.NEXT
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);
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}
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/**
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* Iterate over all the previous siblings of the given object. (in reverse tree order)
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*
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* * `O(1)` for a single iteration
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*
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* @method previousSiblingsIterator
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object} An iterable iterator (ES6)
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*/
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previousSiblingsIterator(object) {
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return new TreeIterator(
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this,
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object,
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this._node(object).previousSibling,
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TreeIterator.PREV
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);
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}
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/**
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* Iterate over all the next siblings of the given object. (in tree order)
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*
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* * `O(1)` for a single iteration
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*
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* @method nextSiblingsIterator
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object} An iterable iterator (ES6)
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*/
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nextSiblingsIterator(object) {
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return new TreeIterator(
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this,
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object,
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this._node(object).nextSibling,
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TreeIterator.NEXT
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);
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}
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/**
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* Iterate over all inclusive ancestors of the given object
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*
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* * `O(1)` for a single iteration
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*
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* @method ancestorsIterator
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* @memberOf module:symbol-tree#
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* @param {Object} object
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* @return {Object} An iterable iterator (ES6)
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*/
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ancestorsIterator(object) {
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return new TreeIterator(
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this,
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object,
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object,
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TreeIterator.PARENT
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);
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}
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/**
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* Iterate over all descendants of the given object (in tree order).
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*
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* Where `n` is the amount of objects in the sub-tree of the given `root`:
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*
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* * `O(n)` (worst case for a single iteration)
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* * `O(n)` (amortized, when completing the iterator)
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*
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* @method treeIterator
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* @memberOf module:symbol-tree#
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* @param {Object} root
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* @param {Object} options
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* @param {Boolean} [options.reverse=false]
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* @return {Object} An iterable iterator (ES6)
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*/
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treeIterator(root, options) {
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const reverse = options && options.reverse;
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return new TreeIterator(
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this,
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root,
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reverse ? this.lastInclusiveDescendant(root) : root,
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reverse ? TreeIterator.PRECEDING : TreeIterator.FOLLOWING
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);
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}
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/**
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* Find the index of the given object (the number of preceding siblings).
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*
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* * `O(n)` where `n` is the amount of preceding siblings
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* * `O(1)` (amortized, if the tree is not modified)
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*
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* @method index
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* @memberOf module:symbol-tree#
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* @param {Object} child
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* @return {Number} The number of preceding siblings, or -1 if the object has no parent
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*/
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index(child) {
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const childNode = this._node(child);
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const parentNode = this._node(childNode.parent);
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if (!parentNode) {
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// In principal, you could also find out the number of preceding siblings
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// for objects that do not have a parent. This method limits itself only to
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// objects that have a parent because that lets us optimize more.
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return -1;
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}
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let currentIndex = childNode.getCachedIndex(parentNode);
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if (currentIndex >= 0) {
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return currentIndex;
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}
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currentIndex = 0;
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let object = parentNode.firstChild;
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if (parentNode.childIndexCachedUpTo) {
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const cachedUpToNode = this._node(parentNode.childIndexCachedUpTo);
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object = cachedUpToNode.nextSibling;
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currentIndex = cachedUpToNode.getCachedIndex(parentNode) + 1;
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}
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while (object) {
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const node = this._node(object);
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node.setCachedIndex(parentNode, currentIndex);
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if (object === child) {
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break;
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}
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++currentIndex;
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object = node.nextSibling;
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}
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parentNode.childIndexCachedUpTo = child;
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return currentIndex;
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}
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/**
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* Calculate the number of children.
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*
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* * `O(n)` where `n` is the amount of children
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* * `O(1)` (amortized, if the tree is not modified)
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*
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* @method childrenCount
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* @memberOf module:symbol-tree#
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* @param {Object} parent
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* @return {Number}
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*/
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childrenCount(parent) {
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const parentNode = this._node(parent);
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if (!parentNode.lastChild) {
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return 0;
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}
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return this.index(parentNode.lastChild) + 1;
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}
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/**
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* Compare the position of an object relative to another object. A bit set is returned:
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*
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* <ul>
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* <li>DISCONNECTED : 1</li>
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* <li>PRECEDING : 2</li>
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* <li>FOLLOWING : 4</li>
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* <li>CONTAINS : 8</li>
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* <li>CONTAINED_BY : 16</li>
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* </ul>
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*
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* The semantics are the same as compareDocumentPosition in DOM, with the exception that
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* DISCONNECTED never occurs with any other bit.
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*
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* where `n` and `m` are the amount of ancestors of `left` and `right`;
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* where `o` is the amount of children of the lowest common ancestor of `left` and `right`:
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*
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* * `O(n + m + o)` (worst case)
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* * `O(n + m)` (amortized, if the tree is not modified)
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*
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* @method compareTreePosition
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* @memberOf module:symbol-tree#
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* @param {Object} left
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* @param {Object} right
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* @return {Number}
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*/
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compareTreePosition(left, right) {
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// In DOM terms:
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// left = reference / context object
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// right = other
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if (left === right) {
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return 0;
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}
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/* jshint -W016 */
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const leftAncestors = []; { // inclusive
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let leftAncestor = left;
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while (leftAncestor) {
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if (leftAncestor === right) {
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return TreePosition.CONTAINS | TreePosition.PRECEDING;
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// other is ancestor of reference
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}
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leftAncestors.push(leftAncestor);
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leftAncestor = this.parent(leftAncestor);
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}
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}
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const rightAncestors = []; {
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let rightAncestor = right;
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while (rightAncestor) {
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if (rightAncestor === left) {
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return TreePosition.CONTAINED_BY | TreePosition.FOLLOWING;
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}
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rightAncestors.push(rightAncestor);
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rightAncestor = this.parent(rightAncestor);
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}
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}
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const root = reverseArrayIndex(leftAncestors, 0);
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if (!root || root !== reverseArrayIndex(rightAncestors, 0)) {
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// note: unlike DOM, preceding / following is not set here
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return TreePosition.DISCONNECTED;
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}
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// find the lowest common ancestor
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let commonAncestorIndex = 0;
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const ancestorsMinLength = Math.min(leftAncestors.length, rightAncestors.length);
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for (let i = 0; i < ancestorsMinLength; ++i) {
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const leftAncestor = reverseArrayIndex(leftAncestors, i);
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const rightAncestor = reverseArrayIndex(rightAncestors, i);
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if (leftAncestor !== rightAncestor) {
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break;
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}
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commonAncestorIndex = i;
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}
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// indexes within the common ancestor
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const leftIndex = this.index(reverseArrayIndex(leftAncestors, commonAncestorIndex + 1));
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const rightIndex = this.index(reverseArrayIndex(rightAncestors, commonAncestorIndex + 1));
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return rightIndex < leftIndex
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? TreePosition.PRECEDING
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: TreePosition.FOLLOWING;
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}
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/**
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* Remove the object from this tree.
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* Has no effect if already removed.
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*
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* * `O(1)`
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*
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* @method remove
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* @memberOf module:symbol-tree#
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* @param {Object} removeObject
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* @return {Object} removeObject
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*/
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remove(removeObject) {
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const removeNode = this._node(removeObject);
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const parentNode = this._node(removeNode.parent);
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const prevNode = this._node(removeNode.previousSibling);
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const nextNode = this._node(removeNode.nextSibling);
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if (parentNode) {
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if (parentNode.firstChild === removeObject) {
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parentNode.firstChild = removeNode.nextSibling;
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}
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if (parentNode.lastChild === removeObject) {
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parentNode.lastChild = removeNode.previousSibling;
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}
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}
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if (prevNode) {
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prevNode.nextSibling = removeNode.nextSibling;
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}
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if (nextNode) {
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nextNode.previousSibling = removeNode.previousSibling;
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}
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removeNode.parent = null;
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removeNode.previousSibling = null;
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removeNode.nextSibling = null;
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removeNode.cachedIndex = -1;
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removeNode.cachedIndexVersion = NaN;
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if (parentNode) {
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parentNode.childrenChanged();
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}
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return removeObject;
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}
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/**
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* Insert the given object before the reference object.
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* `newObject` is now the previous sibling of `referenceObject`.
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*
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* * `O(1)`
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*
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* @method insertBefore
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* @memberOf module:symbol-tree#
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* @param {Object} referenceObject
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* @param {Object} newObject
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* @throws {Error} If the newObject is already present in this SymbolTree
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* @return {Object} newObject
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*/
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insertBefore(referenceObject, newObject) {
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const referenceNode = this._node(referenceObject);
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const prevNode = this._node(referenceNode.previousSibling);
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const newNode = this._node(newObject);
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const parentNode = this._node(referenceNode.parent);
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if (newNode.isAttached) {
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throw Error('Given object is already present in this SymbolTree, remove it first');
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}
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newNode.parent = referenceNode.parent;
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newNode.previousSibling = referenceNode.previousSibling;
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newNode.nextSibling = referenceObject;
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referenceNode.previousSibling = newObject;
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if (prevNode) {
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prevNode.nextSibling = newObject;
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}
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if (parentNode && parentNode.firstChild === referenceObject) {
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parentNode.firstChild = newObject;
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}
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if (parentNode) {
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parentNode.childrenChanged();
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}
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return newObject;
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}
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/**
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* Insert the given object after the reference object.
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* `newObject` is now the next sibling of `referenceObject`.
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*
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* * `O(1)`
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*
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* @method insertAfter
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* @memberOf module:symbol-tree#
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* @param {Object} referenceObject
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* @param {Object} newObject
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* @throws {Error} If the newObject is already present in this SymbolTree
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* @return {Object} newObject
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*/
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insertAfter(referenceObject, newObject) {
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const referenceNode = this._node(referenceObject);
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const nextNode = this._node(referenceNode.nextSibling);
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const newNode = this._node(newObject);
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const parentNode = this._node(referenceNode.parent);
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if (newNode.isAttached) {
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throw Error('Given object is already present in this SymbolTree, remove it first');
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}
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newNode.parent = referenceNode.parent;
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newNode.previousSibling = referenceObject;
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newNode.nextSibling = referenceNode.nextSibling;
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referenceNode.nextSibling = newObject;
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if (nextNode) {
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nextNode.previousSibling = newObject;
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}
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if (parentNode && parentNode.lastChild === referenceObject) {
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parentNode.lastChild = newObject;
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}
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if (parentNode) {
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parentNode.childrenChanged();
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}
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return newObject;
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}
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|
|
/**
|
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* Insert the given object as the first child of the given reference object.
|
|
* `newObject` is now the first child of `referenceObject`.
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*
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* * `O(1)`
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*
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* @method prependChild
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* @memberOf module:symbol-tree#
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* @param {Object} referenceObject
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* @param {Object} newObject
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* @throws {Error} If the newObject is already present in this SymbolTree
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* @return {Object} newObject
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*/
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prependChild(referenceObject, newObject) {
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const referenceNode = this._node(referenceObject);
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const newNode = this._node(newObject);
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|
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if (newNode.isAttached) {
|
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throw Error('Given object is already present in this SymbolTree, remove it first');
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}
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|
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if (referenceNode.hasChildren) {
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this.insertBefore(referenceNode.firstChild, newObject);
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}
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else {
|
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newNode.parent = referenceObject;
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|
referenceNode.firstChild = newObject;
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|
referenceNode.lastChild = newObject;
|
|
referenceNode.childrenChanged();
|
|
}
|
|
|
|
return newObject;
|
|
}
|
|
|
|
/**
|
|
* Insert the given object as the last child of the given reference object.
|
|
* `newObject` is now the last child of `referenceObject`.
|
|
*
|
|
* * `O(1)`
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|
*
|
|
* @method appendChild
|
|
* @memberOf module:symbol-tree#
|
|
* @param {Object} referenceObject
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|
* @param {Object} newObject
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|
* @throws {Error} If the newObject is already present in this SymbolTree
|
|
* @return {Object} newObject
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|
*/
|
|
appendChild(referenceObject, newObject) {
|
|
const referenceNode = this._node(referenceObject);
|
|
const newNode = this._node(newObject);
|
|
|
|
if (newNode.isAttached) {
|
|
throw Error('Given object is already present in this SymbolTree, remove it first');
|
|
}
|
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|
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if (referenceNode.hasChildren) {
|
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this.insertAfter(referenceNode.lastChild, newObject);
|
|
}
|
|
else {
|
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newNode.parent = referenceObject;
|
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referenceNode.firstChild = newObject;
|
|
referenceNode.lastChild = newObject;
|
|
referenceNode.childrenChanged();
|
|
}
|
|
|
|
return newObject;
|
|
}
|
|
}
|
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|
|
module.exports = SymbolTree;
|
|
SymbolTree.TreePosition = TreePosition;
|
|
|