1 | var Symbol = require('./_Symbol'),
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2 | Uint8Array = require('./_Uint8Array'),
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3 | eq = require('./eq'),
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4 | equalArrays = require('./_equalArrays'),
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5 | mapToArray = require('./_mapToArray'),
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6 | setToArray = require('./_setToArray');
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7 |
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8 | /** Used to compose bitmasks for value comparisons. */
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9 | var COMPARE_PARTIAL_FLAG = 1,
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10 | COMPARE_UNORDERED_FLAG = 2;
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11 |
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12 | /** `Object#toString` result references. */
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13 | var boolTag = '[object Boolean]',
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14 | dateTag = '[object Date]',
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15 | errorTag = '[object Error]',
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16 | mapTag = '[object Map]',
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17 | numberTag = '[object Number]',
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18 | regexpTag = '[object RegExp]',
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19 | setTag = '[object Set]',
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20 | stringTag = '[object String]',
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21 | symbolTag = '[object Symbol]';
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22 |
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23 | var arrayBufferTag = '[object ArrayBuffer]',
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24 | dataViewTag = '[object DataView]';
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25 |
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26 | /** Used to convert symbols to primitives and strings. */
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27 | var symbolProto = Symbol ? Symbol.prototype : undefined,
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28 | symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;
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29 |
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30 | /**
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31 | * A specialized version of `baseIsEqualDeep` for comparing objects of
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32 | * the same `toStringTag`.
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33 | *
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34 | * **Note:** This function only supports comparing values with tags of
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35 | * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
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36 | *
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37 | * @private
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38 | * @param {Object} object The object to compare.
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39 | * @param {Object} other The other object to compare.
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40 | * @param {string} tag The `toStringTag` of the objects to compare.
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41 | * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
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42 | * @param {Function} customizer The function to customize comparisons.
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43 | * @param {Function} equalFunc The function to determine equivalents of values.
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44 | * @param {Object} stack Tracks traversed `object` and `other` objects.
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45 | * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
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46 | */
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47 | function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
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48 | switch (tag) {
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49 | case dataViewTag:
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50 | if ((object.byteLength != other.byteLength) ||
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51 | (object.byteOffset != other.byteOffset)) {
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52 | return false;
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53 | }
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54 | object = object.buffer;
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55 | other = other.buffer;
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56 |
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57 | case arrayBufferTag:
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58 | if ((object.byteLength != other.byteLength) ||
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59 | !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
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60 | return false;
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61 | }
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62 | return true;
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63 |
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64 | case boolTag:
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65 | case dateTag:
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66 | case numberTag:
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67 | // Coerce booleans to `1` or `0` and dates to milliseconds.
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68 | // Invalid dates are coerced to `NaN`.
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69 | return eq(+object, +other);
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70 |
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71 | case errorTag:
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72 | return object.name == other.name && object.message == other.message;
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73 |
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74 | case regexpTag:
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75 | case stringTag:
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76 | // Coerce regexes to strings and treat strings, primitives and objects,
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77 | // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
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78 | // for more details.
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79 | return object == (other + '');
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80 |
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81 | case mapTag:
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82 | var convert = mapToArray;
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83 |
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84 | case setTag:
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85 | var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
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86 | convert || (convert = setToArray);
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87 |
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88 | if (object.size != other.size && !isPartial) {
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89 | return false;
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90 | }
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91 | // Assume cyclic values are equal.
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92 | var stacked = stack.get(object);
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93 | if (stacked) {
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94 | return stacked == other;
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95 | }
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96 | bitmask |= COMPARE_UNORDERED_FLAG;
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97 |
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98 | // Recursively compare objects (susceptible to call stack limits).
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99 | stack.set(object, other);
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100 | var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
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101 | stack['delete'](object);
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102 | return result;
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103 |
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104 | case symbolTag:
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105 | if (symbolValueOf) {
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106 | return symbolValueOf.call(object) == symbolValueOf.call(other);
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107 | }
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108 | }
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109 | return false;
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110 | }
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111 |
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112 | module.exports = equalByTag;
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