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app_vue/node_modules/webpack/lib/util/LazySet.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const makeSerializable = require("./makeSerializable.js");
+
+/**
+ * @template T
+ * @param {Set<T>} targetSet set where items should be added
+ * @param {Set<Iterable<T>>} toMerge iterables to be merged
+ * @returns {void}
+ */
+const merge = (targetSet, toMerge) => {
+	for (const set of toMerge) {
+		for (const item of set) {
+			targetSet.add(item);
+		}
+	}
+};
+
+/**
+ * @template T
+ * @param {Set<Iterable<T>>} targetSet set where iterables should be added
+ * @param {Array<LazySet<T>>} toDeepMerge lazy sets to be flattened
+ * @returns {void}
+ */
+const flatten = (targetSet, toDeepMerge) => {
+	for (const set of toDeepMerge) {
+		if (set._set.size > 0) targetSet.add(set._set);
+		if (set._needMerge) {
+			for (const mergedSet of set._toMerge) {
+				targetSet.add(mergedSet);
+			}
+			flatten(targetSet, set._toDeepMerge);
+		}
+	}
+};
+
+/**
+ * Like Set but with an addAll method to eventually add items from another iterable.
+ * Access methods make sure that all delayed operations are executed.
+ * Iteration methods deopts to normal Set performance until clear is called again (because of the chance of modifications during iteration).
+ * @template T
+ */
+class LazySet {
+	/**
+	 * @param {Iterable<T>=} iterable init iterable
+	 */
+	constructor(iterable) {
+		/** @type {Set<T>} */
+		this._set = new Set(iterable);
+		/** @type {Set<Iterable<T>>} */
+		this._toMerge = new Set();
+		/** @type {Array<LazySet<T>>} */
+		this._toDeepMerge = [];
+		this._needMerge = false;
+		this._deopt = false;
+	}
+
+	_flatten() {
+		flatten(this._toMerge, this._toDeepMerge);
+		this._toDeepMerge.length = 0;
+	}
+
+	_merge() {
+		this._flatten();
+		merge(this._set, this._toMerge);
+		this._toMerge.clear();
+		this._needMerge = false;
+	}
+
+	_isEmpty() {
+		return (
+			this._set.size === 0 &&
+			this._toMerge.size === 0 &&
+			this._toDeepMerge.length === 0
+		);
+	}
+
+	get size() {
+		if (this._needMerge) this._merge();
+		return this._set.size;
+	}
+
+	/**
+	 * @param {T} item an item
+	 * @returns {LazySet<T>} itself
+	 */
+	add(item) {
+		this._set.add(item);
+		return this;
+	}
+
+	/**
+	 * @param {Iterable<T> | LazySet<T>} iterable a immutable iterable or another immutable LazySet which will eventually be merged into the Set
+	 * @returns {LazySet<T>} itself
+	 */
+	addAll(iterable) {
+		if (this._deopt) {
+			const _set = this._set;
+			for (const item of iterable) {
+				_set.add(item);
+			}
+		} else {
+			if (iterable instanceof LazySet) {
+				if (iterable._isEmpty()) return this;
+				this._toDeepMerge.push(iterable);
+				this._needMerge = true;
+				if (this._toDeepMerge.length > 100000) {
+					this._flatten();
+				}
+			} else {
+				this._toMerge.add(iterable);
+				this._needMerge = true;
+			}
+			if (this._toMerge.size > 100000) this._merge();
+		}
+		return this;
+	}
+
+	clear() {
+		this._set.clear();
+		this._toMerge.clear();
+		this._toDeepMerge.length = 0;
+		this._needMerge = false;
+		this._deopt = false;
+	}
+
+	/**
+	 * @param {T} value an item
+	 * @returns {boolean} true, if the value was in the Set before
+	 */
+	delete(value) {
+		if (this._needMerge) this._merge();
+		return this._set.delete(value);
+	}
+
+	/**
+	 * @returns {IterableIterator<[T, T]>} entries
+	 */
+	entries() {
+		this._deopt = true;
+		if (this._needMerge) this._merge();
+		return this._set.entries();
+	}
+
+	/**
+	 * @template K
+	 * @param {(value: T, value2: T, set: Set<T>) => void} callbackFn function called for each entry
+	 * @param {K} thisArg this argument for the callbackFn
+	 * @returns {void}
+	 */
+	forEach(callbackFn, thisArg) {
+		this._deopt = true;
+		if (this._needMerge) this._merge();
+		// eslint-disable-next-line unicorn/no-array-for-each
+		this._set.forEach(callbackFn, thisArg);
+	}
+
+	/**
+	 * @param {T} item an item
+	 * @returns {boolean} true, when the item is in the Set
+	 */
+	has(item) {
+		if (this._needMerge) this._merge();
+		return this._set.has(item);
+	}
+
+	/**
+	 * @returns {IterableIterator<T>} keys
+	 */
+	keys() {
+		this._deopt = true;
+		if (this._needMerge) this._merge();
+		return this._set.keys();
+	}
+
+	/**
+	 * @returns {IterableIterator<T>} values
+	 */
+	values() {
+		this._deopt = true;
+		if (this._needMerge) this._merge();
+		return this._set.values();
+	}
+
+	/**
+	 * @returns {IterableIterator<T>} iterable iterator
+	 */
+	[Symbol.iterator]() {
+		this._deopt = true;
+		if (this._needMerge) this._merge();
+		return this._set[Symbol.iterator]();
+	}
+
+	/* istanbul ignore next */
+	get [Symbol.toStringTag]() {
+		return "LazySet";
+	}
+
+	/**
+	 * @param {import("../serialization/ObjectMiddleware").ObjectSerializerContext} context context
+	 */
+	serialize({ write }) {
+		if (this._needMerge) this._merge();
+		write(this._set.size);
+		for (const item of this._set) write(item);
+	}
+
+	/**
+	 * @template T
+	 * @param {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} context context
+	 * @returns {LazySet<T>} lazy set
+	 */
+	static deserialize({ read }) {
+		const count = read();
+		const items = [];
+		for (let i = 0; i < count; i++) {
+			items.push(read());
+		}
+		return new LazySet(items);
+	}
+}
+
+makeSerializable(LazySet, "webpack/lib/util/LazySet");
+
+module.exports = LazySet;