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

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/**
+ * intersect creates Set containing the intersection of elements between all sets
+ * @template T
+ * @param {Set<T>[]} sets an array of sets being checked for shared elements
+ * @returns {Set<T>} returns a new Set containing the intersecting items
+ */
+const intersect = sets => {
+	if (sets.length === 0) return new Set();
+	if (sets.length === 1) return new Set(sets[0]);
+	let minSize = Infinity;
+	let minIndex = -1;
+	for (let i = 0; i < sets.length; i++) {
+		const size = sets[i].size;
+		if (size < minSize) {
+			minIndex = i;
+			minSize = size;
+		}
+	}
+	const current = new Set(sets[minIndex]);
+	for (let i = 0; i < sets.length; i++) {
+		if (i === minIndex) continue;
+		const set = sets[i];
+		for (const item of current) {
+			if (!set.has(item)) {
+				current.delete(item);
+			}
+		}
+	}
+	return current;
+};
+
+/**
+ * Checks if a set is the subset of another set
+ * @template T
+ * @param {Set<T>} bigSet a Set which contains the original elements to compare against
+ * @param {Set<T>} smallSet the set whose elements might be contained inside of bigSet
+ * @returns {boolean} returns true if smallSet contains all elements inside of the bigSet
+ */
+const isSubset = (bigSet, smallSet) => {
+	if (bigSet.size < smallSet.size) return false;
+	for (const item of smallSet) {
+		if (!bigSet.has(item)) return false;
+	}
+	return true;
+};
+
+/**
+ * @template T
+ * @param {Set<T>} set a set
+ * @param {(set: T) => boolean} fn selector function
+ * @returns {T | undefined} found item
+ */
+const find = (set, fn) => {
+	for (const item of set) {
+		if (fn(item)) return item;
+	}
+};
+
+/**
+ * @template T
+ * @param {Set<T> | ReadonlySet<T>} set a set
+ * @returns {T | undefined} first item
+ */
+const first = set => {
+	const entry = set.values().next();
+	return entry.done ? undefined : entry.value;
+};
+
+/**
+ * @template T
+ * @param {Set<T>} a first
+ * @param {Set<T>} b second
+ * @returns {Set<T>} combined set, may be identical to a or b
+ */
+const combine = (a, b) => {
+	if (b.size === 0) return a;
+	if (a.size === 0) return b;
+	const set = new Set(a);
+	for (const item of b) set.add(item);
+	return set;
+};
+
+module.exports.intersect = intersect;
+module.exports.isSubset = isSubset;
+module.exports.find = find;
+module.exports.first = first;
+module.exports.combine = combine;