91 lines
2.8 KiB
JavaScript
91 lines
2.8 KiB
JavaScript
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var keys = require('./keys');
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/** Used to compose bitmasks for comparison styles. */
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var PARTIAL_COMPARE_FLAG = 2;
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/** Used for built-in 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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* A specialized version of `baseIsEqualDeep` for objects with support for
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* partial deep comparisons.
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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 comparisons.
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* @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual`
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* for more details.
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* @param {Object} stack Tracks traversed `object` and `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 equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
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var isPartial = bitmask & PARTIAL_COMPARE_FLAG,
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objProps = keys(object),
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objLength = objProps.length,
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othProps = keys(other),
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othLength = othProps.length;
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if (objLength != othLength && !isPartial) {
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return false;
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}
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var index = objLength;
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while (index--) {
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var key = objProps[index];
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if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
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return false;
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}
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}
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// Assume cyclic values are equal.
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var stacked = stack.get(object);
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if (stacked && stack.get(other)) {
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return stacked == other;
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}
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var result = true;
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stack.set(object, other);
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stack.set(other, object);
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var skipCtor = isPartial;
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while (++index < objLength) {
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key = objProps[index];
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var objValue = object[key],
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othValue = other[key];
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if (customizer) {
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var compared = isPartial
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? customizer(othValue, objValue, key, other, object, stack)
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: customizer(objValue, othValue, key, object, other, stack);
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}
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// Recursively compare objects (susceptible to call stack limits).
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if (!(compared === undefined
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? (objValue === othValue || equalFunc(objValue, othValue, customizer, bitmask, stack))
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: compared
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)) {
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result = false;
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break;
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}
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skipCtor || (skipCtor = key == 'constructor');
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}
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if (result && !skipCtor) {
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var objCtor = object.constructor,
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othCtor = other.constructor;
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// Non `Object` object instances with different constructors are not equal.
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if (objCtor != othCtor &&
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('constructor' in object && 'constructor' in other) &&
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!(typeof objCtor == 'function' && objCtor instanceof objCtor &&
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typeof othCtor == 'function' && othCtor instanceof othCtor)) {
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result = false;
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}
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}
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stack['delete'](object);
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stack['delete'](other);
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return result;
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}
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module.exports = equalObjects;
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