mirror of https://github.com/webpack/webpack.git
569 lines
16 KiB
JavaScript
569 lines
16 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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/** @type {WeakMap<object, WeakMap<object, object>>} */
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const mergeCache = new WeakMap();
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/** @type {WeakMap<object, Map<string, Map<string|number|boolean, object>>>} */
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const setPropertyCache = new WeakMap();
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const DELETE = Symbol("DELETE");
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const DYNAMIC_INFO = Symbol("cleverMerge dynamic info");
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/**
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* Merges two given objects and caches the result to avoid computation if same objects passed as arguments again.
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* @template T
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* @template O
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* @example
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* // performs cleverMerge(first, second), stores the result in WeakMap and returns result
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* cachedCleverMerge({a: 1}, {a: 2})
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* {a: 2}
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* // when same arguments passed, gets the result from WeakMap and returns it.
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* cachedCleverMerge({a: 1}, {a: 2})
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* {a: 2}
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* @param {T} first first object
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* @param {O} second second object
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* @returns {T & O | T | O} merged object of first and second object
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*/
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const cachedCleverMerge = (first, second) => {
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if (second === undefined) return first;
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if (first === undefined) return second;
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if (typeof second !== "object" || second === null) return second;
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if (typeof first !== "object" || first === null) return first;
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let innerCache = mergeCache.get(first);
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if (innerCache === undefined) {
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innerCache = new WeakMap();
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mergeCache.set(first, innerCache);
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}
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const prevMerge = innerCache.get(second);
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if (prevMerge !== undefined) return prevMerge;
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const newMerge = _cleverMerge(first, second, true);
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innerCache.set(second, newMerge);
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return newMerge;
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};
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/**
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* @template T
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* @param {Partial<T>} obj object
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* @param {string} property property
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* @param {string|number|boolean} value assignment value
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* @returns {T} new object
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*/
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const cachedSetProperty = (obj, property, value) => {
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let mapByProperty = setPropertyCache.get(obj);
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if (mapByProperty === undefined) {
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mapByProperty = new Map();
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setPropertyCache.set(obj, mapByProperty);
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}
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let mapByValue = mapByProperty.get(property);
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if (mapByValue === undefined) {
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mapByValue = new Map();
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mapByProperty.set(property, mapByValue);
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}
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let result = mapByValue.get(value);
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if (result) return result;
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result = {
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...obj,
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[property]: value
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};
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mapByValue.set(value, result);
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return result;
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};
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/**
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* @typedef {Object} ObjectParsedPropertyEntry
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* @property {any | undefined} base base value
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* @property {string | undefined} byProperty the name of the selector property
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* @property {Map<string, any>} byValues value depending on selector property, merged with base
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*/
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/**
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* @typedef {Object} ParsedObject
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* @property {Map<string, ObjectParsedPropertyEntry>} static static properties (key is property name)
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* @property {{ byProperty: string, fn: Function } | undefined} dynamic dynamic part
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*/
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/** @type {WeakMap<object, ParsedObject>} */
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const parseCache = new WeakMap();
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/**
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* @param {object} obj the object
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* @returns {ParsedObject} parsed object
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*/
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const cachedParseObject = obj => {
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const entry = parseCache.get(obj);
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if (entry !== undefined) return entry;
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const result = parseObject(obj);
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parseCache.set(obj, result);
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return result;
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};
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/**
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* @param {object} obj the object
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* @returns {ParsedObject} parsed object
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*/
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const parseObject = obj => {
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const info = new Map();
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let dynamicInfo;
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const getInfo = p => {
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const entry = info.get(p);
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if (entry !== undefined) return entry;
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const newEntry = {
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base: undefined,
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byProperty: undefined,
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byValues: undefined
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};
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info.set(p, newEntry);
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return newEntry;
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};
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for (const key of Object.keys(obj)) {
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if (key.startsWith("by")) {
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const byProperty = key;
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const byObj = obj[byProperty];
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if (typeof byObj === "object") {
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for (const byValue of Object.keys(byObj)) {
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const obj = byObj[byValue];
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for (const key of Object.keys(obj)) {
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const entry = getInfo(key);
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if (entry.byProperty === undefined) {
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entry.byProperty = byProperty;
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entry.byValues = new Map();
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} else if (entry.byProperty !== byProperty) {
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throw new Error(
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`${byProperty} and ${entry.byProperty} for a single property is not supported`
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);
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}
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entry.byValues.set(byValue, obj[key]);
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if (byValue === "default") {
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for (const otherByValue of Object.keys(byObj)) {
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if (!entry.byValues.has(otherByValue))
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entry.byValues.set(otherByValue, undefined);
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}
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}
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}
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}
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} else if (typeof byObj === "function") {
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if (dynamicInfo === undefined) {
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dynamicInfo = {
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byProperty: key,
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fn: byObj
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};
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} else {
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throw new Error(
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`${key} and ${dynamicInfo.byProperty} when both are functions is not supported`
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);
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}
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} else {
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const entry = getInfo(key);
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entry.base = obj[key];
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}
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} else {
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const entry = getInfo(key);
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entry.base = obj[key];
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}
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}
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return {
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static: info,
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dynamic: dynamicInfo
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};
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};
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/**
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* @param {Map<string, ObjectParsedPropertyEntry>} info static properties (key is property name)
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* @param {{ byProperty: string, fn: Function } | undefined} dynamicInfo dynamic part
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* @returns {object} the object
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*/
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const serializeObject = (info, dynamicInfo) => {
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const obj = {};
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// Setup byProperty structure
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for (const entry of info.values()) {
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if (entry.byProperty !== undefined) {
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const byObj = (obj[entry.byProperty] = obj[entry.byProperty] || {});
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for (const byValue of entry.byValues.keys()) {
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byObj[byValue] = byObj[byValue] || {};
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}
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}
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}
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for (const [key, entry] of info) {
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if (entry.base !== undefined) {
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obj[key] = entry.base;
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}
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// Fill byProperty structure
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if (entry.byProperty !== undefined) {
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const byObj = (obj[entry.byProperty] = obj[entry.byProperty] || {});
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for (const byValue of Object.keys(byObj)) {
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const value = getFromByValues(entry.byValues, byValue);
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if (value !== undefined) byObj[byValue][key] = value;
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}
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}
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}
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if (dynamicInfo !== undefined) {
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obj[dynamicInfo.byProperty] = dynamicInfo.fn;
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}
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return obj;
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};
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const VALUE_TYPE_UNDEFINED = 0;
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const VALUE_TYPE_ATOM = 1;
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const VALUE_TYPE_ARRAY_EXTEND = 2;
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const VALUE_TYPE_OBJECT = 3;
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const VALUE_TYPE_DELETE = 4;
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/**
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* @param {any} value a single value
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* @returns {VALUE_TYPE_UNDEFINED | VALUE_TYPE_ATOM | VALUE_TYPE_ARRAY_EXTEND | VALUE_TYPE_OBJECT | VALUE_TYPE_DELETE} value type
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*/
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const getValueType = value => {
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if (value === undefined) {
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return VALUE_TYPE_UNDEFINED;
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} else if (value === DELETE) {
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return VALUE_TYPE_DELETE;
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} else if (Array.isArray(value)) {
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if (value.lastIndexOf("...") !== -1) return VALUE_TYPE_ARRAY_EXTEND;
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return VALUE_TYPE_ATOM;
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} else if (
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typeof value === "object" &&
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value !== null &&
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(!value.constructor || value.constructor === Object)
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) {
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return VALUE_TYPE_OBJECT;
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}
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return VALUE_TYPE_ATOM;
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};
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/**
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* Merges two objects. Objects are deeply clever merged.
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* Arrays might reference the old value with "...".
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* Non-object values take preference over object values.
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* @template T
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* @template O
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* @param {T} first first object
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* @param {O} second second object
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* @returns {T & O | T | O} merged object of first and second object
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*/
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const cleverMerge = (first, second) => {
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if (second === undefined) return first;
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if (first === undefined) return second;
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if (typeof second !== "object" || second === null) return second;
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if (typeof first !== "object" || first === null) return first;
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return _cleverMerge(first, second, false);
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};
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/**
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* Merges two objects. Objects are deeply clever merged.
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* @param {object} first first object
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* @param {object} second second object
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* @param {boolean} internalCaching should parsing of objects and nested merges be cached
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* @returns {object} merged object of first and second object
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*/
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const _cleverMerge = (first, second, internalCaching = false) => {
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const firstObject = internalCaching
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? cachedParseObject(first)
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: parseObject(first);
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const { static: firstInfo, dynamic: firstDynamicInfo } = firstObject;
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// If the first argument has a dynamic part we modify the dynamic part to merge the second argument
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if (firstDynamicInfo !== undefined) {
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let { byProperty, fn } = firstDynamicInfo;
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const fnInfo = fn[DYNAMIC_INFO];
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if (fnInfo) {
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second = internalCaching
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? cachedCleverMerge(fnInfo[1], second)
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: cleverMerge(fnInfo[1], second);
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fn = fnInfo[0];
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}
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const newFn = (...args) => {
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const fnResult = fn(...args);
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return internalCaching
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? cachedCleverMerge(fnResult, second)
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: cleverMerge(fnResult, second);
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};
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newFn[DYNAMIC_INFO] = [fn, second];
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return serializeObject(firstObject.static, { byProperty, fn: newFn });
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}
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// If the first part is static only, we merge the static parts and keep the dynamic part of the second argument
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const secondObject = internalCaching
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? cachedParseObject(second)
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: parseObject(second);
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const { static: secondInfo, dynamic: secondDynamicInfo } = secondObject;
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/** @type {Map<string, ObjectParsedPropertyEntry>} */
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const resultInfo = new Map();
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for (const [key, firstEntry] of firstInfo) {
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const secondEntry = secondInfo.get(key);
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const entry =
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secondEntry !== undefined
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? mergeEntries(firstEntry, secondEntry, internalCaching)
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: firstEntry;
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resultInfo.set(key, entry);
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}
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for (const [key, secondEntry] of secondInfo) {
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if (!firstInfo.has(key)) {
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resultInfo.set(key, secondEntry);
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}
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}
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return serializeObject(resultInfo, secondDynamicInfo);
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};
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/**
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* @param {ObjectParsedPropertyEntry} firstEntry a
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* @param {ObjectParsedPropertyEntry} secondEntry b
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* @param {boolean} internalCaching should parsing of objects and nested merges be cached
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* @returns {ObjectParsedPropertyEntry} new entry
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*/
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const mergeEntries = (firstEntry, secondEntry, internalCaching) => {
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switch (getValueType(secondEntry.base)) {
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case VALUE_TYPE_ATOM:
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case VALUE_TYPE_DELETE:
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// No need to consider firstEntry at all
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// second value override everything
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// = second.base + second.byProperty
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return secondEntry;
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case VALUE_TYPE_UNDEFINED:
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if (!firstEntry.byProperty) {
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// = first.base + second.byProperty
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return {
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base: firstEntry.base,
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byProperty: secondEntry.byProperty,
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byValues: secondEntry.byValues
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};
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} else if (firstEntry.byProperty !== secondEntry.byProperty) {
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throw new Error(
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`${firstEntry.byProperty} and ${secondEntry.byProperty} for a single property is not supported`
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);
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} else {
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// = first.base + (first.byProperty + second.byProperty)
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// need to merge first and second byValues
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const newByValues = new Map(firstEntry.byValues);
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for (const [key, value] of secondEntry.byValues) {
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const firstValue = getFromByValues(firstEntry.byValues, key);
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newByValues.set(
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key,
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mergeSingleValue(firstValue, value, internalCaching)
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);
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}
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return {
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base: firstEntry.base,
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byProperty: firstEntry.byProperty,
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byValues: newByValues
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};
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}
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default: {
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if (!firstEntry.byProperty) {
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// The simple case
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// = (first.base + second.base) + second.byProperty
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return {
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base: mergeSingleValue(
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firstEntry.base,
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secondEntry.base,
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internalCaching
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),
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byProperty: secondEntry.byProperty,
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byValues: secondEntry.byValues
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};
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}
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let newBase;
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const intermediateByValues = new Map(firstEntry.byValues);
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for (const [key, value] of intermediateByValues) {
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intermediateByValues.set(
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key,
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mergeSingleValue(value, secondEntry.base, internalCaching)
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);
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}
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if (
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Array.from(firstEntry.byValues.values()).every(value => {
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const type = getValueType(value);
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return type === VALUE_TYPE_ATOM || type === VALUE_TYPE_DELETE;
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})
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) {
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// = (first.base + second.base) + ((first.byProperty + second.base) + second.byProperty)
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newBase = mergeSingleValue(
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firstEntry.base,
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secondEntry.base,
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internalCaching
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);
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} else {
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// = first.base + ((first.byProperty (+default) + second.base) + second.byProperty)
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newBase = firstEntry.base;
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if (!intermediateByValues.has("default"))
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intermediateByValues.set("default", secondEntry.base);
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}
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if (!secondEntry.byProperty) {
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// = first.base + (first.byProperty + second.base)
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return {
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base: newBase,
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byProperty: firstEntry.byProperty,
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byValues: intermediateByValues
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};
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} else if (firstEntry.byProperty !== secondEntry.byProperty) {
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throw new Error(
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`${firstEntry.byProperty} and ${secondEntry.byProperty} for a single property is not supported`
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);
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}
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const newByValues = new Map(intermediateByValues);
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for (const [key, value] of secondEntry.byValues) {
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const firstValue = getFromByValues(intermediateByValues, key);
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newByValues.set(
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key,
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mergeSingleValue(firstValue, value, internalCaching)
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);
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}
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return {
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base: newBase,
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byProperty: firstEntry.byProperty,
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byValues: newByValues
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};
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}
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}
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};
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/**
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* @param {Map<string, any>} byValues all values
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* @param {string} key value of the selector
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* @returns {any | undefined} value
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*/
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const getFromByValues = (byValues, key) => {
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if (key !== "default" && byValues.has(key)) {
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return byValues.get(key);
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}
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return byValues.get("default");
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};
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/**
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* @param {any} a value
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* @param {any} b value
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* @param {boolean} internalCaching should parsing of objects and nested merges be cached
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* @returns {any} value
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*/
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const mergeSingleValue = (a, b, internalCaching) => {
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const bType = getValueType(b);
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const aType = getValueType(a);
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switch (bType) {
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case VALUE_TYPE_DELETE:
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case VALUE_TYPE_ATOM:
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return b;
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case VALUE_TYPE_OBJECT: {
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return aType !== VALUE_TYPE_OBJECT
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? b
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: internalCaching
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? cachedCleverMerge(a, b)
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: cleverMerge(a, b);
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}
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case VALUE_TYPE_UNDEFINED:
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return a;
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case VALUE_TYPE_ARRAY_EXTEND:
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switch (
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aType !== VALUE_TYPE_ATOM
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? aType
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: Array.isArray(a)
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? VALUE_TYPE_ARRAY_EXTEND
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: VALUE_TYPE_OBJECT
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) {
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case VALUE_TYPE_UNDEFINED:
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return b;
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case VALUE_TYPE_DELETE:
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return b.filter(item => item !== "...");
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case VALUE_TYPE_ARRAY_EXTEND: {
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const newArray = [];
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for (const item of b) {
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if (item === "...") {
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for (const item of a) {
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newArray.push(item);
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}
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} else {
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newArray.push(item);
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}
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}
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return newArray;
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}
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case VALUE_TYPE_OBJECT:
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return b.map(item => (item === "..." ? a : item));
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default:
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throw new Error("Not implemented");
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}
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default:
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throw new Error("Not implemented");
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}
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};
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|
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/**
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* @template T
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* @param {T} obj the object
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* @returns {T} the object without operations like "..." or DELETE
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*/
|
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const removeOperations = obj => {
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const newObj = /** @type {T} */ ({});
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for (const key of Object.keys(obj)) {
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const value = obj[key];
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const type = getValueType(value);
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switch (type) {
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case VALUE_TYPE_UNDEFINED:
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case VALUE_TYPE_DELETE:
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break;
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case VALUE_TYPE_OBJECT:
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newObj[key] = removeOperations(value);
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break;
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case VALUE_TYPE_ARRAY_EXTEND:
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newObj[key] = value.filter(i => i !== "...");
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break;
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default:
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newObj[key] = value;
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break;
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}
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}
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return newObj;
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};
|
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|
|
/**
|
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* @template T
|
|
* @template {string} P
|
|
* @param {T} obj the object
|
|
* @param {P} byProperty the by description
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|
* @param {...any} values values
|
|
* @returns {Omit<T, P>} object with merged byProperty
|
|
*/
|
|
const resolveByProperty = (obj, byProperty, ...values) => {
|
|
if (typeof obj !== "object" || obj === null || !(byProperty in obj)) {
|
|
return obj;
|
|
}
|
|
const { [byProperty]: _byValue, ..._remaining } = /** @type {object} */ (obj);
|
|
const remaining = /** @type {T} */ (_remaining);
|
|
const byValue = /** @type {Record<string, T> | function(...any[]): T} */ (
|
|
_byValue
|
|
);
|
|
if (typeof byValue === "object") {
|
|
const key = values[0];
|
|
if (key in byValue) {
|
|
return cachedCleverMerge(remaining, byValue[key]);
|
|
} else if ("default" in byValue) {
|
|
return cachedCleverMerge(remaining, byValue.default);
|
|
} else {
|
|
return /** @type {T} */ (remaining);
|
|
}
|
|
} else if (typeof byValue === "function") {
|
|
const result = byValue.apply(null, values);
|
|
return cachedCleverMerge(
|
|
remaining,
|
|
resolveByProperty(result, byProperty, ...values)
|
|
);
|
|
}
|
|
};
|
|
|
|
exports.cachedSetProperty = cachedSetProperty;
|
|
exports.cachedCleverMerge = cachedCleverMerge;
|
|
exports.cleverMerge = cleverMerge;
|
|
exports.resolveByProperty = resolveByProperty;
|
|
exports.removeOperations = removeOperations;
|
|
exports.DELETE = DELETE;
|