675 lines
19 KiB
JavaScript
675 lines
19 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<EXPECTED_OBJECT, WeakMap<EXPECTED_OBJECT, EXPECTED_OBJECT>>} */
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const mergeCache = new WeakMap();
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/** @type {WeakMap<EXPECTED_OBJECT, Map<string, Map<string | number | boolean, EXPECTED_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 | null | undefined} first first object
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* @param {O | null | undefined} 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 /** @type {T} */ (first);
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if (first === undefined) return /** @type {O} */ (second);
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if (typeof second !== "object" || second === null) {
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return /** @type {O} */ (second);
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}
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if (typeof first !== "object" || first === null) {
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return /** @type {T} */ (first);
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}
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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 = /** @type {T & O} */ (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 /** @type {T} */ (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 /** @type {T} */ (result);
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};
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/**
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* @typedef {Map<string, EXPECTED_ANY>} ByValues
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*/
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/**
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* @template T
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* @typedef {object} ObjectParsedPropertyEntry
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* @property {T[keyof T] | undefined} base base value
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* @property {string | undefined} byProperty the name of the selector property
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* @property {ByValues | undefined} byValues value depending on selector property, merged with base
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*/
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/** @typedef {(function(...EXPECTED_ANY): object) & { [DYNAMIC_INFO]: [DynamicFunction, object] }} DynamicFunction */
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/**
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* @template {object} T
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* @typedef {Map<keyof T, ObjectParsedPropertyEntry<T>>} ParsedObjectStatic
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*/
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/**
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* @template {object} T
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* @typedef {{ byProperty: string, fn: DynamicFunction }} ParsedObjectDynamic
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*/
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/**
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* @template {object} T
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* @typedef {object} ParsedObject
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* @property {ParsedObjectStatic<T>} static static properties (key is property name)
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* @property {ParsedObjectDynamic<T> | undefined} dynamic dynamic part
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*/
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/** @type {WeakMap<EXPECTED_OBJECT, ParsedObject<EXPECTED_ANY>>} */
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const parseCache = new WeakMap();
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/**
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* @template {object} T
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* @param {T} obj the object
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* @returns {ParsedObject<T>} parsed object
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*/
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const cachedParseObject = (obj) => {
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const entry = parseCache.get(/** @type {EXPECTED_OBJECT} */ (obj));
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if (entry !== undefined) return entry;
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const result = parseObject(obj);
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parseCache.set(/** @type {EXPECTED_OBJECT} */ (obj), result);
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return result;
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};
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/** @typedef {{ [p: string]: { [p: string]: EXPECTED_ANY } } | DynamicFunction} ByObject */
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/**
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* @template {object} T
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* @param {T} obj the object
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* @returns {ParsedObject<T>} parsed object
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*/
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const parseObject = (obj) => {
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/** @type {ParsedObjectStatic<T>} */
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const info = new Map();
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/** @type {ParsedObjectDynamic<T> | undefined} */
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let dynamicInfo;
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/**
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* @param {keyof T} p path
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* @returns {Partial<ObjectParsedPropertyEntry<T>>} object parsed property entry
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*/
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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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const key = /** @type {keyof T} */ (key_);
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if (typeof key === "string" && key.startsWith("by")) {
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const byProperty = key;
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const byObj = /** @type {ByObject} */ (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[/** @type {keyof (keyof T)} */ (byValue)];
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for (const key of Object.keys(obj)) {
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const entry = getInfo(/** @type {keyof T} */ (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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`${/** @type {string} */ (byProperty)} and ${entry.byProperty} for a single property is not supported`
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);
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}
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/** @type {ByValues} */
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(entry.byValues).set(byValue, obj[key]);
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if (byValue === "default") {
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for (const otherByValue of Object.keys(byObj)) {
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if (
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!(
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/** @type {ByValues} */
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(entry.byValues).has(otherByValue)
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)
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) {
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/** @type {ByValues} */
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(entry.byValues).set(otherByValue, undefined);
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}
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}
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}
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}
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}
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} else if (typeof byObj === "function") {
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if (dynamicInfo === undefined) {
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dynamicInfo = {
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byProperty: key,
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fn: byObj
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};
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} else {
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throw new Error(
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`${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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* @template {object} T
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* @param {ParsedObjectStatic<T>} info static properties (key is property name)
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* @param {{ byProperty: string, fn: DynamicFunction } | undefined} dynamicInfo dynamic part
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* @returns {T} the object
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*/
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const serializeObject = (info, dynamicInfo) => {
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const obj = /** @type {T} */ ({});
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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 byProperty = /** @type {keyof T} */ (entry.byProperty);
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const byObj = (obj[byProperty] =
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obj[byProperty] || /** @type {TODO} */ ({}));
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for (const byValue of /** @type {ByValues} */ (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[/** @type {keyof T} */ (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 byProperty = /** @type {keyof T} */ (entry.byProperty);
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const byObj = (obj[byProperty] =
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obj[byProperty] || /** @type {TODO} */ ({}));
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for (const byValue of Object.keys(byObj)) {
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const value = getFromByValues(
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/** @type {ByValues} */
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(entry.byValues),
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byValue
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);
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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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/** @type {TODO} */
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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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* @template T
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* @param {T} 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.includes("...")) 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 /** @type {T & O} */ (_cleverMerge(first, second, false));
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};
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/**
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* @template {object} T
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* @template {object} O
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* Merges two objects. Objects are deeply clever merged.
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* @param {T} first first
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* @param {O} second second
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* @param {boolean} internalCaching should parsing of objects and nested merges be cached
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* @returns {T & O} 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 =
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/** @type {O} */
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(
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internalCaching
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? cachedCleverMerge(fnInfo[1], second)
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: cleverMerge(fnInfo[1], second)
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);
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fn = fnInfo[0];
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}
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/** @type {DynamicFunction} */
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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 /** @type {T & O} */ (
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serializeObject(firstObject.static, { byProperty, fn: newFn })
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);
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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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const resultInfo = new Map();
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for (const [key, firstEntry] of firstInfo) {
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const secondEntry = secondInfo.get(
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/** @type {keyof (T | O)} */
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(key)
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);
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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(/** @type {keyof (T | O)} */ (key))) {
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resultInfo.set(key, secondEntry);
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}
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}
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return /** @type {T & O} */ (serializeObject(resultInfo, secondDynamicInfo));
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};
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/**
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* @template T, O
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* @param {ObjectParsedPropertyEntry<T>} firstEntry a
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* @param {ObjectParsedPropertyEntry<O>} secondEntry b
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* @param {boolean} internalCaching should parsing of objects and nested merges be cached
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* @returns {ObjectParsedPropertyEntry<TODO>} 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 /** @type {ByValues} */ (
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secondEntry.byValues
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)) {
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const firstValue = getFromByValues(
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/** @type {ByValues} */
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(firstEntry.byValues),
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key
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);
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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:
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/** @type {T[keyof T] & O[keyof O]} */
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(
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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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),
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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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[.../** @type {ByValues} */ (firstEntry.byValues).values()].every(
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(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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) {
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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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}
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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 /** @type {ByValues} */ (
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secondEntry.byValues
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)) {
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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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* @template V
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* @param {ByValues} byValues all values
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* @param {string} key value of the selector
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* @returns {V | 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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|
|
|
/**
|
|
* @template A
|
|
* @template B
|
|
* @param {A | A[]} a value
|
|
* @param {B | B[]} b value
|
|
* @param {boolean} internalCaching should parsing of objects and nested merges be cached
|
|
* @returns {A & B | (A | B)[] | A | A[] | B | B[]} value
|
|
*/
|
|
const mergeSingleValue = (a, b, internalCaching) => {
|
|
const bType = getValueType(b);
|
|
const aType = getValueType(a);
|
|
switch (bType) {
|
|
case VALUE_TYPE_DELETE:
|
|
case VALUE_TYPE_ATOM:
|
|
return b;
|
|
case VALUE_TYPE_OBJECT: {
|
|
return aType !== VALUE_TYPE_OBJECT
|
|
? b
|
|
: internalCaching
|
|
? cachedCleverMerge(a, b)
|
|
: cleverMerge(a, b);
|
|
}
|
|
case VALUE_TYPE_UNDEFINED:
|
|
return a;
|
|
case VALUE_TYPE_ARRAY_EXTEND:
|
|
switch (
|
|
aType !== VALUE_TYPE_ATOM
|
|
? aType
|
|
: Array.isArray(a)
|
|
? VALUE_TYPE_ARRAY_EXTEND
|
|
: VALUE_TYPE_OBJECT
|
|
) {
|
|
case VALUE_TYPE_UNDEFINED:
|
|
return b;
|
|
case VALUE_TYPE_DELETE:
|
|
return /** @type {B[]} */ (b).filter((item) => item !== "...");
|
|
case VALUE_TYPE_ARRAY_EXTEND: {
|
|
/** @type {(A | B)[]} */
|
|
const newArray = [];
|
|
for (const item of /** @type {B[]} */ (b)) {
|
|
if (item === "...") {
|
|
for (const item of /** @type {A[]} */ (a)) {
|
|
newArray.push(item);
|
|
}
|
|
} else {
|
|
newArray.push(item);
|
|
}
|
|
}
|
|
return newArray;
|
|
}
|
|
case VALUE_TYPE_OBJECT:
|
|
return /** @type {(A | B)[]} */ (b).map((item) =>
|
|
item === "..." ? /** @type {A} */ (a) : item
|
|
);
|
|
default:
|
|
throw new Error("Not implemented");
|
|
}
|
|
default:
|
|
throw new Error("Not implemented");
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @template {object} T
|
|
* @param {T} obj the object
|
|
* @param {(keyof T)[]=} keysToKeepOriginalValue keys to keep original value
|
|
* @returns {T} the object without operations like "..." or DELETE
|
|
*/
|
|
const removeOperations = (obj, keysToKeepOriginalValue = []) => {
|
|
const newObj = /** @type {T} */ ({});
|
|
for (const _key of Object.keys(obj)) {
|
|
const key = /** @type {keyof T} */ (_key);
|
|
const value = obj[key];
|
|
const type = getValueType(value);
|
|
if (type === VALUE_TYPE_OBJECT && keysToKeepOriginalValue.includes(key)) {
|
|
newObj[key] = value;
|
|
continue;
|
|
}
|
|
switch (type) {
|
|
case VALUE_TYPE_UNDEFINED:
|
|
case VALUE_TYPE_DELETE:
|
|
break;
|
|
case VALUE_TYPE_OBJECT:
|
|
newObj[key] =
|
|
/** @type {T[keyof T]} */
|
|
(
|
|
removeOperations(
|
|
/** @type {T} */
|
|
(value),
|
|
keysToKeepOriginalValue
|
|
)
|
|
);
|
|
break;
|
|
case VALUE_TYPE_ARRAY_EXTEND:
|
|
newObj[key] =
|
|
/** @type {T[keyof T]} */
|
|
(
|
|
/** @type {EXPECTED_ANY[]} */
|
|
(value).filter((i) => i !== "...")
|
|
);
|
|
break;
|
|
default:
|
|
newObj[key] = value;
|
|
break;
|
|
}
|
|
}
|
|
return newObj;
|
|
};
|
|
|
|
/**
|
|
* @template T
|
|
* @template {keyof T} P
|
|
* @template V
|
|
* @param {T} obj the object
|
|
* @param {P} byProperty the by description
|
|
* @param {...V} 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 } = obj;
|
|
const remaining = /** @type {T} */ (_remaining);
|
|
const byValue =
|
|
/** @type {Record<string, T> | ((...args: V[]) => T)} */
|
|
(_byValue);
|
|
if (typeof byValue === "object") {
|
|
const key = /** @type {string} */ (values[0]);
|
|
if (key in byValue) {
|
|
return cachedCleverMerge(remaining, byValue[key]);
|
|
} else if ("default" in byValue) {
|
|
return cachedCleverMerge(remaining, byValue.default);
|
|
}
|
|
return remaining;
|
|
} else if (typeof byValue === "function") {
|
|
// eslint-disable-next-line prefer-spread
|
|
const result = byValue.apply(null, values);
|
|
return cachedCleverMerge(
|
|
remaining,
|
|
resolveByProperty(result, byProperty, ...values)
|
|
);
|
|
}
|
|
return obj;
|
|
};
|
|
|
|
module.exports.DELETE = DELETE;
|
|
module.exports.cachedCleverMerge = cachedCleverMerge;
|
|
module.exports.cachedSetProperty = cachedSetProperty;
|
|
module.exports.cleverMerge = cleverMerge;
|
|
module.exports.removeOperations = removeOperations;
|
|
module.exports.resolveByProperty = resolveByProperty;
|