360 lines
13 KiB
JavaScript
360 lines
13 KiB
JavaScript
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(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
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typeof define === 'function' && define.amd ? define(['exports'], factory) :
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(global = typeof globalThis !== 'undefined' ? globalThis : global || self, factory(global["fast-equals"] = {}));
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})(this, (function (exports) { 'use strict';
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var HAS_WEAK_MAP_SUPPORT = typeof WeakMap === 'function';
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var keys = Object.keys;
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/**
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* are the values passed strictly equal or both NaN
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*
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* @param a the value to compare against
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* @param b the value to test
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* @returns are the values equal by the SameValueZero principle
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*/
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function sameValueZeroEqual(a, b) {
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return a === b || (a !== a && b !== b);
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}
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/**
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* is the value a plain object
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*
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* @param value the value to test
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* @returns is the value a plain object
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*/
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function isPlainObject(value) {
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return value.constructor === Object || value.constructor == null;
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}
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/**
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* is the value promise-like (meaning it is thenable)
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*
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* @param value the value to test
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* @returns is the value promise-like
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*/
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function isPromiseLike(value) {
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return !!value && typeof value.then === 'function';
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}
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/**
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* is the value passed a react element
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*
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* @param value the value to test
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* @returns is the value a react element
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*/
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function isReactElement(value) {
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return !!(value && value.$$typeof);
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}
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/**
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* in cases where WeakMap is not supported, creates a new custom
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* object that mimics the necessary API aspects for cache purposes
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*
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* @returns the new cache object
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*/
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function getNewCacheFallback() {
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var entries = [];
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return {
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delete: function (key) {
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for (var index = 0; index < entries.length; ++index) {
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if (entries[index][0] === key) {
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entries.splice(index, 1);
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return;
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}
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}
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},
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get: function (key) {
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for (var index = 0; index < entries.length; ++index) {
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if (entries[index][0] === key) {
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return entries[index][1];
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}
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}
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},
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set: function (key, value) {
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for (var index = 0; index < entries.length; ++index) {
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if (entries[index][0] === key) {
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entries[index][1] = value;
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return;
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}
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}
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entries.push([key, value]);
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}
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};
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}
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/**
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* get a new cache object to prevent circular references
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*
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* @returns the new cache object
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*/
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var getNewCache = (function (canUseWeakMap) {
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if (canUseWeakMap) {
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return function _getNewCache() {
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return new WeakMap();
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};
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}
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return getNewCacheFallback;
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})(HAS_WEAK_MAP_SUPPORT);
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/**
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* create a custom isEqual handler specific to circular objects
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*
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* @param [isEqual] the isEqual comparator to use instead of isDeepEqual
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* @returns the method to create the `isEqual` function
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*/
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function createCircularEqualCreator(isEqual) {
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return function createCircularEqual(comparator) {
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var _comparator = isEqual || comparator;
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return function circularEqual(a, b, indexOrKeyA, indexOrKeyB, parentA, parentB, cache) {
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if (cache === void 0) { cache = getNewCache(); }
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var isCacheableA = !!a && typeof a === 'object';
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var isCacheableB = !!b && typeof b === 'object';
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if (isCacheableA !== isCacheableB) {
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return false;
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}
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if (!isCacheableA && !isCacheableB) {
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return _comparator(a, b, cache);
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}
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var cachedA = cache.get(a);
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if (cachedA && cache.get(b)) {
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return cachedA === b;
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}
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cache.set(a, b);
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cache.set(b, a);
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var result = _comparator(a, b, cache);
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cache.delete(a);
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cache.delete(b);
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return result;
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};
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};
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}
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/**
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* are the arrays equal in value
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*
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* @param a the array to test
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* @param b the array to test against
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* @param isEqual the comparator to determine equality
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* @param meta the meta object to pass through
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* @returns are the arrays equal
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*/
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function areArraysEqual(a, b, isEqual, meta) {
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var index = a.length;
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if (b.length !== index) {
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return false;
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}
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while (index-- > 0) {
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if (!isEqual(a[index], b[index], index, index, a, b, meta)) {
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return false;
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}
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}
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return true;
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}
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/**
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* are the maps equal in value
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*
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* @param a the map to test
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* @param b the map to test against
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* @param isEqual the comparator to determine equality
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* @param meta the meta map to pass through
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* @returns are the maps equal
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*/
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function areMapsEqual(a, b, isEqual, meta) {
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var isValueEqual = a.size === b.size;
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if (isValueEqual && a.size) {
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var matchedIndices_1 = {};
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var indexA_1 = 0;
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a.forEach(function (aValue, aKey) {
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if (isValueEqual) {
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var hasMatch_1 = false;
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var matchIndexB_1 = 0;
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b.forEach(function (bValue, bKey) {
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if (!hasMatch_1 && !matchedIndices_1[matchIndexB_1]) {
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hasMatch_1 =
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isEqual(aKey, bKey, indexA_1, matchIndexB_1, a, b, meta) &&
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isEqual(aValue, bValue, aKey, bKey, a, b, meta);
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if (hasMatch_1) {
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matchedIndices_1[matchIndexB_1] = true;
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}
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}
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matchIndexB_1++;
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});
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indexA_1++;
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isValueEqual = hasMatch_1;
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}
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});
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}
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return isValueEqual;
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}
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var OWNER = '_owner';
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var hasOwnProperty = Function.prototype.bind.call(Function.prototype.call, Object.prototype.hasOwnProperty);
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/**
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* are the objects equal in value
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*
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* @param a the object to test
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* @param b the object to test against
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* @param isEqual the comparator to determine equality
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* @param meta the meta object to pass through
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* @returns are the objects equal
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*/
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function areObjectsEqual(a, b, isEqual, meta) {
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var keysA = keys(a);
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var index = keysA.length;
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if (keys(b).length !== index) {
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return false;
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}
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if (index) {
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var key = void 0;
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while (index-- > 0) {
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key = keysA[index];
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if (key === OWNER) {
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var reactElementA = isReactElement(a);
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var reactElementB = isReactElement(b);
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if ((reactElementA || reactElementB) &&
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reactElementA !== reactElementB) {
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return false;
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}
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}
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if (!hasOwnProperty(b, key) ||
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!isEqual(a[key], b[key], key, key, a, b, meta)) {
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return false;
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}
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}
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}
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return true;
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}
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/**
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* are the regExps equal in value
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*
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* @param a the regExp to test
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* @param b the regExp to test agains
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* @returns are the regExps equal
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*/
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var areRegExpsEqual = (function () {
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if (/foo/g.flags === 'g') {
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return function areRegExpsEqual(a, b) {
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return a.source === b.source && a.flags === b.flags;
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};
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}
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return function areRegExpsEqualFallback(a, b) {
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return (a.source === b.source &&
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a.global === b.global &&
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a.ignoreCase === b.ignoreCase &&
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a.multiline === b.multiline &&
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a.unicode === b.unicode &&
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a.sticky === b.sticky &&
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a.lastIndex === b.lastIndex);
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};
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})();
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/**
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* are the sets equal in value
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*
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* @param a the set to test
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* @param b the set to test against
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* @param isEqual the comparator to determine equality
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* @param meta the meta set to pass through
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* @returns are the sets equal
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*/
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function areSetsEqual(a, b, isEqual, meta) {
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var isValueEqual = a.size === b.size;
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if (isValueEqual && a.size) {
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var matchedIndices_2 = {};
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a.forEach(function (aValue, aKey) {
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if (isValueEqual) {
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var hasMatch_2 = false;
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var matchIndex_1 = 0;
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b.forEach(function (bValue, bKey) {
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if (!hasMatch_2 && !matchedIndices_2[matchIndex_1]) {
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hasMatch_2 = isEqual(aValue, bValue, aKey, bKey, a, b, meta);
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if (hasMatch_2) {
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matchedIndices_2[matchIndex_1] = true;
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}
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}
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matchIndex_1++;
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});
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isValueEqual = hasMatch_2;
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}
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});
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}
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return isValueEqual;
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}
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var HAS_MAP_SUPPORT = typeof Map === 'function';
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var HAS_SET_SUPPORT = typeof Set === 'function';
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var valueOf = Object.prototype.valueOf;
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function createComparator(createIsEqual) {
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var isEqual =
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/* eslint-disable no-use-before-define */
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typeof createIsEqual === 'function'
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? createIsEqual(comparator)
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: function (a, b, indexOrKeyA, indexOrKeyB, parentA, parentB, meta) { return comparator(a, b, meta); };
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/* eslint-enable */
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/**
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* compare the value of the two objects and return true if they are equivalent in values
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*
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* @param a the value to test against
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* @param b the value to test
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* @param [meta] an optional meta object that is passed through to all equality test calls
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* @returns are a and b equivalent in value
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*/
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function comparator(a, b, meta) {
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if (a === b) {
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return true;
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}
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if (a && b && typeof a === 'object' && typeof b === 'object') {
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if (isPlainObject(a) && isPlainObject(b)) {
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return areObjectsEqual(a, b, isEqual, meta);
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}
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var aShape = Array.isArray(a);
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var bShape = Array.isArray(b);
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if (aShape || bShape) {
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return aShape === bShape && areArraysEqual(a, b, isEqual, meta);
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}
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aShape = a instanceof Date;
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bShape = b instanceof Date;
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if (aShape || bShape) {
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return (aShape === bShape && sameValueZeroEqual(a.getTime(), b.getTime()));
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}
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aShape = a instanceof RegExp;
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bShape = b instanceof RegExp;
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if (aShape || bShape) {
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return aShape === bShape && areRegExpsEqual(a, b);
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}
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if (isPromiseLike(a) || isPromiseLike(b)) {
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return a === b;
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}
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if (HAS_MAP_SUPPORT) {
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aShape = a instanceof Map;
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bShape = b instanceof Map;
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if (aShape || bShape) {
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return aShape === bShape && areMapsEqual(a, b, isEqual, meta);
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}
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}
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if (HAS_SET_SUPPORT) {
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aShape = a instanceof Set;
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bShape = b instanceof Set;
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if (aShape || bShape) {
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return aShape === bShape && areSetsEqual(a, b, isEqual, meta);
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}
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}
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if (a.valueOf !== valueOf || b.valueOf !== valueOf) {
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return sameValueZeroEqual(a.valueOf(), b.valueOf());
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}
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return areObjectsEqual(a, b, isEqual, meta);
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}
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return a !== a && b !== b;
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}
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return comparator;
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}
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var deepEqual = createComparator();
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var shallowEqual = createComparator(function () { return sameValueZeroEqual; });
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var circularDeepEqual = createComparator(createCircularEqualCreator());
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var circularShallowEqual = createComparator(createCircularEqualCreator(sameValueZeroEqual));
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exports.circularDeepEqual = circularDeepEqual;
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exports.circularShallowEqual = circularShallowEqual;
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exports.createCustomEqual = createComparator;
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exports.deepEqual = deepEqual;
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exports.sameValueZeroEqual = sameValueZeroEqual;
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exports.shallowEqual = shallowEqual;
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Object.defineProperty(exports, '__esModule', { value: true });
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}));
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//# sourceMappingURL=fast-equals.js.map
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