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

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const TupleSet = require("./TupleSet");
+
+/**
+ * @template T
+ * @template V
+ */
+class TupleQueue {
+	/**
+	 * @param {Iterable<[T, V, ...EXPECTED_ANY]>=} items The initial elements.
+	 */
+	constructor(items) {
+		/**
+		 * @private
+		 * @type {TupleSet<T, V>}
+		 */
+		this._set = new TupleSet(items);
+		/**
+		 * @private
+		 * @type {Iterator<[T, V, ...EXPECTED_ANY]>}
+		 */
+		this._iterator = this._set[Symbol.iterator]();
+	}
+
+	/**
+	 * Returns the number of elements in this queue.
+	 * @returns {number} The number of elements in this queue.
+	 */
+	get length() {
+		return this._set.size;
+	}
+
+	/**
+	 * Appends the specified element to this queue.
+	 * @param {[T, V, ...EXPECTED_ANY]} item The element to add.
+	 * @returns {void}
+	 */
+	enqueue(...item) {
+		this._set.add(...item);
+	}
+
+	/**
+	 * Retrieves and removes the head of this queue.
+	 * @returns {[T, V, ...EXPECTED_ANY] | undefined} The head of the queue of `undefined` if this queue is empty.
+	 */
+	dequeue() {
+		const result = this._iterator.next();
+		if (result.done) {
+			if (this._set.size > 0) {
+				this._iterator = this._set[Symbol.iterator]();
+				const value =
+					/** @type {[T, V, ...EXPECTED_ANY]} */
+					(this._iterator.next().value);
+				this._set.delete(...value);
+				return value;
+			}
+			return;
+		}
+		this._set.delete(.../** @type {[T, V, ...EXPECTED_ANY]} */ (result.value));
+		return result.value;
+	}
+}
+
+module.exports = TupleQueue;