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

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/**
+ * @typedef {object} GroupOptions
+ * @property {boolean=} groupChildren
+ * @property {boolean=} force
+ * @property {number=} targetGroupCount
+ */
+
+/**
+ * @template T
+ * @template R
+ * @typedef {object} GroupConfig
+ * @property {(item: T) => string[] | undefined} getKeys
+ * @property {(key: string, children: (R | T)[], items: T[]) => R} createGroup
+ * @property {(name: string, items: T[]) => GroupOptions=} getOptions
+ */
+
+/**
+ * @template T
+ * @template R
+ * @typedef {object} ItemWithGroups
+ * @property {T} item
+ * @property {Set<Group<T, R>>} groups
+ */
+
+/**
+ * @template T
+ * @template R
+ * @typedef {{ config: GroupConfig<T, R>, name: string, alreadyGrouped: boolean, items: Set<ItemWithGroups<T, R>> | undefined }} Group
+ */
+
+/**
+ * @template T
+ * @template R
+ * @param {T[]} items the list of items
+ * @param {GroupConfig<T, R>[]} groupConfigs configuration
+ * @returns {(R | T)[]} grouped items
+ */
+const smartGrouping = (items, groupConfigs) => {
+	/** @type {Set<ItemWithGroups<T, R>>} */
+	const itemsWithGroups = new Set();
+	/** @type {Map<string, Group<T, R>>} */
+	const allGroups = new Map();
+	for (const item of items) {
+		/** @type {Set<Group<T, R>>} */
+		const groups = new Set();
+		for (let i = 0; i < groupConfigs.length; i++) {
+			const groupConfig = groupConfigs[i];
+			const keys = groupConfig.getKeys(item);
+			if (keys) {
+				for (const name of keys) {
+					const key = `${i}:${name}`;
+					let group = allGroups.get(key);
+					if (group === undefined) {
+						allGroups.set(
+							key,
+							(group = {
+								config: groupConfig,
+								name,
+								alreadyGrouped: false,
+								items: undefined
+							})
+						);
+					}
+					groups.add(group);
+				}
+			}
+		}
+		itemsWithGroups.add({
+			item,
+			groups
+		});
+	}
+	/**
+	 * @param {Set<ItemWithGroups<T, R>>} itemsWithGroups input items with groups
+	 * @returns {(T | R)[]} groups items
+	 */
+	const runGrouping = itemsWithGroups => {
+		const totalSize = itemsWithGroups.size;
+		for (const entry of itemsWithGroups) {
+			for (const group of entry.groups) {
+				if (group.alreadyGrouped) continue;
+				const items = group.items;
+				if (items === undefined) {
+					group.items = new Set([entry]);
+				} else {
+					items.add(entry);
+				}
+			}
+		}
+		/** @type {Map<Group<T, R>, { items: Set<ItemWithGroups<T, R>>, options: GroupOptions | false | undefined, used: boolean }>} */
+		const groupMap = new Map();
+		for (const group of allGroups.values()) {
+			if (group.items) {
+				const items = group.items;
+				group.items = undefined;
+				groupMap.set(group, {
+					items,
+					options: undefined,
+					used: false
+				});
+			}
+		}
+		/** @type {(T | R)[]} */
+		const results = [];
+		for (;;) {
+			/** @type {Group<T, R> | undefined} */
+			let bestGroup;
+			let bestGroupSize = -1;
+			let bestGroupItems;
+			let bestGroupOptions;
+			for (const [group, state] of groupMap) {
+				const { items, used } = state;
+				let options = state.options;
+				if (options === undefined) {
+					const groupConfig = group.config;
+					state.options = options =
+						(groupConfig.getOptions &&
+							groupConfig.getOptions(
+								group.name,
+								Array.from(items, ({ item }) => item)
+							)) ||
+						false;
+				}
+
+				const force = options && options.force;
+				if (!force) {
+					if (bestGroupOptions && bestGroupOptions.force) continue;
+					if (used) continue;
+					if (items.size <= 1 || totalSize - items.size <= 1) {
+						continue;
+					}
+				}
+				const targetGroupCount = (options && options.targetGroupCount) || 4;
+				const sizeValue = force
+					? items.size
+					: Math.min(
+							items.size,
+							(totalSize * 2) / targetGroupCount +
+								itemsWithGroups.size -
+								items.size
+						);
+				if (
+					sizeValue > bestGroupSize ||
+					(force && (!bestGroupOptions || !bestGroupOptions.force))
+				) {
+					bestGroup = group;
+					bestGroupSize = sizeValue;
+					bestGroupItems = items;
+					bestGroupOptions = options;
+				}
+			}
+			if (bestGroup === undefined) {
+				break;
+			}
+			const items = new Set(bestGroupItems);
+			const options = bestGroupOptions;
+
+			const groupChildren = !options || options.groupChildren !== false;
+
+			for (const item of items) {
+				itemsWithGroups.delete(item);
+				// Remove all groups that items have from the map to not select them again
+				for (const group of item.groups) {
+					const state = groupMap.get(group);
+					if (state !== undefined) {
+						state.items.delete(item);
+						if (state.items.size === 0) {
+							groupMap.delete(group);
+						} else {
+							state.options = undefined;
+							if (groupChildren) {
+								state.used = true;
+							}
+						}
+					}
+				}
+			}
+			groupMap.delete(bestGroup);
+
+			const key = bestGroup.name;
+			const groupConfig = bestGroup.config;
+
+			const allItems = Array.from(items, ({ item }) => item);
+
+			bestGroup.alreadyGrouped = true;
+			const children = groupChildren ? runGrouping(items) : allItems;
+			bestGroup.alreadyGrouped = false;
+
+			results.push(groupConfig.createGroup(key, children, allItems));
+		}
+		for (const { item } of itemsWithGroups) {
+			results.push(item);
+		}
+		return results;
+	};
+	return runGrouping(itemsWithGroups);
+};
+
+module.exports = smartGrouping;