114 lines
3.7 KiB
JavaScript
114 lines
3.7 KiB
JavaScript
![]() |
var Symbol = require('./_Symbol'),
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Uint8Array = require('./_Uint8Array'),
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eq = require('./eq'),
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equalArrays = require('./_equalArrays'),
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mapToArray = require('./_mapToArray'),
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setToArray = require('./_setToArray');
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/** Used to compose bitmasks for comparison styles. */
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var UNORDERED_COMPARE_FLAG = 1,
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PARTIAL_COMPARE_FLAG = 2;
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/** `Object#toString` result references. */
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var boolTag = '[object Boolean]',
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dateTag = '[object Date]',
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errorTag = '[object Error]',
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mapTag = '[object Map]',
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numberTag = '[object Number]',
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regexpTag = '[object RegExp]',
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setTag = '[object Set]',
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stringTag = '[object String]',
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symbolTag = '[object Symbol]';
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var arrayBufferTag = '[object ArrayBuffer]',
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dataViewTag = '[object DataView]';
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/** Used to convert symbols to primitives and strings. */
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var symbolProto = Symbol ? Symbol.prototype : undefined,
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symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;
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/**
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* A specialized version of `baseIsEqualDeep` for comparing objects of
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* the same `toStringTag`.
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*
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* **Note:** This function only supports comparing values with tags of
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* `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
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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 {string} tag The `toStringTag` of the objects 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 equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
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switch (tag) {
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case dataViewTag:
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if ((object.byteLength != other.byteLength) ||
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(object.byteOffset != other.byteOffset)) {
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return false;
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}
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object = object.buffer;
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other = other.buffer;
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case arrayBufferTag:
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if ((object.byteLength != other.byteLength) ||
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!equalFunc(new Uint8Array(object), new Uint8Array(other))) {
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return false;
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}
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return true;
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case boolTag:
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case dateTag:
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case numberTag:
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// Coerce booleans to `1` or `0` and dates to milliseconds.
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// Invalid dates are coerced to `NaN`.
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return eq(+object, +other);
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case errorTag:
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return object.name == other.name && object.message == other.message;
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case regexpTag:
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case stringTag:
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// Coerce regexes to strings and treat strings, primitives and objects,
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// as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
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// for more details.
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return object == (other + '');
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case mapTag:
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var convert = mapToArray;
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case setTag:
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var isPartial = bitmask & PARTIAL_COMPARE_FLAG;
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convert || (convert = setToArray);
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if (object.size != other.size && !isPartial) {
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return false;
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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) {
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return stacked == other;
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}
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bitmask |= UNORDERED_COMPARE_FLAG;
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// Recursively compare objects (susceptible to call stack limits).
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stack.set(object, other);
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var result = equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask, stack);
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stack['delete'](object);
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return result;
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case symbolTag:
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if (symbolValueOf) {
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return symbolValueOf.call(object) == symbolValueOf.call(other);
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}
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}
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return false;
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}
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module.exports = equalByTag;
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