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Viewing / Editing File: _initCloneByTag.js

var cloneArrayBuffer = require('./_cloneArrayBuffer'),
    cloneDataView = require('./_cloneDataView'),
    cloneRegExp = require('./_cloneRegExp'),
    cloneSymbol = require('./_cloneSymbol'),
    cloneTypedArray = require('./_cloneTypedArray');

/** `Object#toString` result references. */
var boolTag = '[object Boolean]',
    dateTag = '[object Date]',
    mapTag = '[object Map]',
    numberTag = '[object Number]',
    regexpTag = '[object RegExp]',
    setTag = '[object Set]',
    stringTag = '[object String]',
    symbolTag = '[object Symbol]';

var arrayBufferTag = '[object ArrayBuffer]',
    dataViewTag = '[object DataView]',
    float32Tag = '[object Float32Array]',
    float64Tag = '[object Float64Array]',
    int8Tag = '[object Int8Array]',
    int16Tag = '[object Int16Array]',
    int32Tag = '[object Int32Array]',
    uint8Tag = '[object Uint8Array]',
    uint8ClampedTag = '[object Uint8ClampedArray]',
    uint16Tag = '[object Uint16Array]',
    uint32Tag = '[object Uint32Array]';

/**
 * Initializes an object clone based on its `toStringTag`.
 *
 * **Note:** This function only supports cloning values with tags of
 * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
 *
 * @private
 * @param {Object} object The object to clone.
 * @param {string} tag The `toStringTag` of the object to clone.
 * @param {boolean} [isDeep] Specify a deep clone.
 * @returns {Object} Returns the initialized clone.
 */
function initCloneByTag(object, tag, isDeep) {
  var Ctor = object.constructor;
  switch (tag) {
    case arrayBufferTag:
      return cloneArrayBuffer(object);

case boolTag:
    case dateTag:
      return new Ctor(+object);

case dataViewTag:
      return cloneDataView(object, isDeep);

case float32Tag: case float64Tag:
    case int8Tag: case int16Tag: case int32Tag:
    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
      return cloneTypedArray(object, isDeep);

case mapTag:
      return new Ctor;

case numberTag:
    case stringTag:
      return new Ctor(object);

case regexpTag:
      return cloneRegExp(object);

case setTag:
      return new Ctor;

case symbolTag:
      return cloneSymbol(object);
  }
}

module.exports = initCloneByTag;

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