103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
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var equalArrays = require('./equalArrays'),
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equalByTag = require('./equalByTag'),
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equalObjects = require('./equalObjects'),
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isArray = require('../lang/isArray'),
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isTypedArray = require('../lang/isTypedArray');
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/** `Object#toString` result references. */
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var argsTag = '[object Arguments]',
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arrayTag = '[object Array]',
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objectTag = '[object Object]';
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/** Used for native method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
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* of values.
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*/
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var objToString = objectProto.toString;
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/**
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* A specialized version of `baseIsEqual` for arrays and objects which performs
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* deep comparisons and tracks traversed objects enabling objects with circular
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* references to be compared.
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*
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* @private
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* @param {Object} object The object to compare.
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* @param {Object} other The other object to compare.
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* @param {Function} equalFunc The function to determine equivalents of values.
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* @param {Function} [customizer] The function to customize comparing objects.
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* @param {boolean} [isLoose] Specify performing partial comparisons.
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* @param {Array} [stackA=[]] Tracks traversed `value` objects.
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* @param {Array} [stackB=[]] Tracks traversed `other` objects.
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* @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
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*/
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function baseIsEqualDeep(object, other, equalFunc, customizer, isLoose, stackA, stackB) {
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var objIsArr = isArray(object),
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othIsArr = isArray(other),
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objTag = arrayTag,
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othTag = arrayTag;
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if (!objIsArr) {
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objTag = objToString.call(object);
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if (objTag == argsTag) {
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objTag = objectTag;
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} else if (objTag != objectTag) {
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objIsArr = isTypedArray(object);
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}
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}
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if (!othIsArr) {
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othTag = objToString.call(other);
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if (othTag == argsTag) {
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othTag = objectTag;
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} else if (othTag != objectTag) {
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othIsArr = isTypedArray(other);
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}
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}
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var objIsObj = objTag == objectTag,
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othIsObj = othTag == objectTag,
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isSameTag = objTag == othTag;
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if (isSameTag && !(objIsArr || objIsObj)) {
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return equalByTag(object, other, objTag);
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}
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if (!isLoose) {
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var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
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othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
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if (objIsWrapped || othIsWrapped) {
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return equalFunc(objIsWrapped ? object.value() : object, othIsWrapped ? other.value() : other, customizer, isLoose, stackA, stackB);
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}
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}
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if (!isSameTag) {
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return false;
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}
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// Assume cyclic values are equal.
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// For more information on detecting circular references see https://es5.github.io/#JO.
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stackA || (stackA = []);
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stackB || (stackB = []);
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var length = stackA.length;
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while (length--) {
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if (stackA[length] == object) {
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return stackB[length] == other;
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}
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}
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// Add `object` and `other` to the stack of traversed objects.
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stackA.push(object);
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stackB.push(other);
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var result = (objIsArr ? equalArrays : equalObjects)(object, other, equalFunc, customizer, isLoose, stackA, stackB);
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stackA.pop();
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stackB.pop();
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return result;
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}
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module.exports = baseIsEqualDeep;
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