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TupleSet.js
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Wed, Feb 19, 07:58

TupleSet.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
/**
* @template {any[]} T
*/
class TupleSet {
constructor(init) {
this._map = new Map();
this.size = 0;
if (init) {
for (const tuple of init) {
this.add(...tuple);
}
}
}
/**
* @param {T} args tuple
* @returns {void}
*/
add(...args) {
let map = this._map;
for (let i = 0; i < args.length - 2; i++) {
const arg = args[i];
const innerMap = map.get(arg);
if (innerMap === undefined) {
map.set(arg, (map = new Map()));
} else {
map = innerMap;
}
}
const beforeLast = args[args.length - 2];
let set = map.get(beforeLast);
if (set === undefined) {
map.set(beforeLast, (set = new Set()));
}
const last = args[args.length - 1];
this.size -= set.size;
set.add(last);
this.size += set.size;
}
/**
* @param {T} args tuple
* @returns {boolean} true, if the tuple is in the Set
*/
has(...args) {
let map = this._map;
for (let i = 0; i < args.length - 2; i++) {
const arg = args[i];
map = map.get(arg);
if (map === undefined) {
return false;
}
}
const beforeLast = args[args.length - 2];
let set = map.get(beforeLast);
if (set === undefined) {
return false;
}
const last = args[args.length - 1];
return set.has(last);
}
/**
* @param {T} args tuple
* @returns {void}
*/
delete(...args) {
let map = this._map;
for (let i = 0; i < args.length - 2; i++) {
const arg = args[i];
map = map.get(arg);
if (map === undefined) {
return;
}
}
const beforeLast = args[args.length - 2];
let set = map.get(beforeLast);
if (set === undefined) {
return;
}
const last = args[args.length - 1];
this.size -= set.size;
set.delete(last);
this.size += set.size;
}
/**
* @returns {Iterator<T>} iterator
*/
[Symbol.iterator]() {
const iteratorStack = [];
const tuple = [];
let currentSetIterator = undefined;
const next = it => {
const result = it.next();
if (result.done) {
if (iteratorStack.length === 0) return false;
tuple.pop();
return next(iteratorStack.pop());
}
const [key, value] = result.value;
iteratorStack.push(it);
tuple.push(key);
if (value instanceof Set) {
currentSetIterator = value[Symbol.iterator]();
return true;
} else {
return next(value[Symbol.iterator]());
}
};
next(this._map[Symbol.iterator]());
return {
next() {
while (currentSetIterator) {
const result = currentSetIterator.next();
if (result.done) {
tuple.pop();
if (!next(iteratorStack.pop())) {
currentSetIterator = undefined;
}
} else {
return {
done: false,
value: /** @type {T} */ (tuple.concat(result.value))
};
}
}
return { done: true, value: undefined };
}
};
}
}
module.exports = TupleSet;

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