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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const NONE = Symbol("not sorted");
/**
* A subset of Set that offers sorting functionality
* @template T item type in set
* @extends {Set<T>}
*/
class SortableSet extends Set {
/**
* Create a new sortable set
* @param {Iterable<T>=} initialIterable The initial iterable value
* @typedef {function(T, T): number} SortFunction
* @param {SortFunction=} defaultSort Default sorting function
*/
constructor(initialIterable, defaultSort) {
super(initialIterable);
/** @private @type {undefined | function(T, T): number}} */
this._sortFn = defaultSort;
/** @private @type {typeof NONE | undefined | function(T, T): number}} */
this._lastActiveSortFn = NONE;
/** @private @type {Map<Function, any> | undefined} */
this._cache = undefined;
/** @private @type {Map<Function, any> | undefined} */
this._cacheOrderIndependent = undefined;
}
/**
* @param {T} value value to add to set
* @returns {this} returns itself
*/
add(value) {
this._lastActiveSortFn = NONE;
this._invalidateCache();
this._invalidateOrderedCache();
super.add(value);
return this;
}
/**
* @param {T} value value to delete
* @returns {boolean} true if value existed in set, false otherwise
*/
delete(value) {
this._invalidateCache();
this._invalidateOrderedCache();
return super.delete(value);
}
/**
* @returns {void}
*/
clear() {
this._invalidateCache();
this._invalidateOrderedCache();
return super.clear();
}
/**
* Sort with a comparer function
* @param {SortFunction} sortFn Sorting comparer function
* @returns {void}
*/
sortWith(sortFn) {
if (this.size <= 1 || sortFn === this._lastActiveSortFn) {
// already sorted - nothing to do
return;
}
const sortedArray = Array.from(this).sort(sortFn);
super.clear();
for (let i = 0; i < sortedArray.length; i += 1) {
super.add(sortedArray[i]);
}
this._lastActiveSortFn = sortFn;
this._invalidateCache();
}
sort() {
this.sortWith(this._sortFn);
return this;
}
/**
* Get data from cache
* @template R
* @param {function(SortableSet<T>): R} fn function to calculate value
* @returns {R} returns result of fn(this), cached until set changes
*/
getFromCache(fn) {
if (this._cache === undefined) {
this._cache = new Map();
} else {
const result = this._cache.get(fn);
const data = /** @type {R} */ (result);
if (data !== undefined) {
return data;
}
}
const newData = fn(this);
this._cache.set(fn, newData);
return newData;
}
/**
* Get data from cache (ignoring sorting)
* @template R
* @param {function(SortableSet<T>): R} fn function to calculate value
* @returns {R} returns result of fn(this), cached until set changes
*/
getFromUnorderedCache(fn) {
if (this._cacheOrderIndependent === undefined) {
this._cacheOrderIndependent = new Map();
} else {
const result = this._cacheOrderIndependent.get(fn);
const data = /** @type {R} */ (result);
if (data !== undefined) {
return data;
}
}
const newData = fn(this);
this._cacheOrderIndependent.set(fn, newData);
return newData;
}
/**
* @private
* @returns {void}
*/
_invalidateCache() {
if (this._cache !== undefined) {
this._cache.clear();
}
}
/**
* @private
* @returns {void}
*/
_invalidateOrderedCache() {
if (this._cacheOrderIndependent !== undefined) {
this._cacheOrderIndependent.clear();
}
}
/**
* @returns {T[]} the raw array
*/
toJSON() {
return Array.from(this);
}
}
module.exports = SortableSet;