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Editing: typed-array-constructor.js

'use strict';
var $ = require('../internals/export');
var global = require('../internals/global');
var call = require('../internals/function-call');
var DESCRIPTORS = require('../internals/descriptors');
var TYPED_ARRAYS_CONSTRUCTORS_REQUIRES_WRAPPERS = require('../internals/typed-array-constructors-require-wrappers');
var ArrayBufferViewCore = require('../internals/array-buffer-view-core');
var ArrayBufferModule = require('../internals/array-buffer');
var anInstance = require('../internals/an-instance');
var createPropertyDescriptor = require('../internals/create-property-descriptor');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var isIntegralNumber = require('../internals/is-integral-number');
var toLength = require('../internals/to-length');
var toIndex = require('../internals/to-index');
var toOffset = require('../internals/to-offset');
var toPropertyKey = require('../internals/to-property-key');
var hasOwn = require('../internals/has-own-property');
var classof = require('../internals/classof');
var isObject = require('../internals/is-object');
var isSymbol = require('../internals/is-symbol');
var create = require('../internals/object-create');
var isPrototypeOf = require('../internals/object-is-prototype-of');
var setPrototypeOf = require('../internals/object-set-prototype-of');
var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
var typedArrayFrom = require('../internals/typed-array-from');
var forEach = require('../internals/array-iteration').forEach;
var setSpecies = require('../internals/set-species');
var definePropertyModule = require('../internals/object-define-property');
var getOwnPropertyDescriptorModule = require('../internals/object-get-own-property-descriptor');
var InternalStateModule = require('../internals/internal-state');
var inheritIfRequired = require('../internals/inherit-if-required');

var getInternalState = InternalStateModule.get;
var setInternalState = InternalStateModule.set;
var enforceInternalState = InternalStateModule.enforce;
var nativeDefineProperty = definePropertyModule.f;
var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
var round = Math.round;
var RangeError = global.RangeError;
var ArrayBuffer = ArrayBufferModule.ArrayBuffer;
var ArrayBufferPrototype = ArrayBuffer.prototype;
var DataView = ArrayBufferModule.DataView;
var NATIVE_ARRAY_BUFFER_VIEWS = ArrayBufferViewCore.NATIVE_ARRAY_BUFFER_VIEWS;
var TYPED_ARRAY_TAG = ArrayBufferViewCore.TYPED_ARRAY_TAG;
var TypedArray = ArrayBufferViewCore.TypedArray;
var TypedArrayPrototype = ArrayBufferViewCore.TypedArrayPrototype;
var aTypedArrayConstructor = ArrayBufferViewCore.aTypedArrayConstructor;
var isTypedArray = ArrayBufferViewCore.isTypedArray;
var BYTES_PER_ELEMENT = 'BYTES_PER_ELEMENT';
var WRONG_LENGTH = 'Wrong length';

var fromList = function (C, list) {
  aTypedArrayConstructor(C);
  var index = 0;
  var length = list.length;
  var result = new C(length);
  while (length > index) result[index] = list[index++];
  return result;
};

var addGetter = function (it, key) {
  nativeDefineProperty(it, key, { get: function () {
    return getInternalState(this)[key];
  } });
};

var isArrayBuffer = function (it) {
  var klass;
  return isPrototypeOf(ArrayBufferPrototype, it) || (klass = classof(it)) == 'ArrayBuffer' || klass == 'SharedArrayBuffer';
};

var isTypedArrayIndex = function (target, key) {
  return isTypedArray(target)
    && !isSymbol(key)
    && key in target
    && isIntegralNumber(+key)
    && key >= 0;
};

var wrappedGetOwnPropertyDescriptor = function getOwnPropertyDescriptor(target, key) {
  key = toPropertyKey(key);
  return isTypedArrayIndex(target, key)
    ? createPropertyDescriptor(2, target[key])
    : nativeGetOwnPropertyDescriptor(target, key);
};

var wrappedDefineProperty = function defineProperty(target, key, descriptor) {
  key = toPropertyKey(key);
  if (isTypedArrayIndex(target, key)
    && isObject(descriptor)
    && hasOwn(descriptor, 'value')
    && !hasOwn(descriptor, 'get')
    && !hasOwn(descriptor, 'set')
    // TODO: add validation descriptor w/o calling accessors
    && !descriptor.configurable
    && (!hasOwn(descriptor, 'writable') || descriptor.writable)
    && (!hasOwn(descriptor, 'enumerable') || descriptor.enumerable)
  ) {
    target[key] = descriptor.value;
    return target;
  } return nativeDefineProperty(target, key, descriptor);
};

if (DESCRIPTORS) {
  if (!NATIVE_ARRAY_BUFFER_VIEWS) {
    getOwnPropertyDescriptorModule.f = wrappedGetOwnPropertyDescriptor;
    definePropertyModule.f = wrappedDefineProperty;
    addGetter(TypedArrayPrototype, 'buffer');
    addGetter(TypedArrayPrototype, 'byteOffset');
    addGetter(TypedArrayPrototype, 'byteLength');
    addGetter(TypedArrayPrototype, 'length');
  }

$({ target: 'Object', stat: true, forced: !NATIVE_ARRAY_BUFFER_VIEWS }, {
    getOwnPropertyDescriptor: wrappedGetOwnPropertyDescriptor,
    defineProperty: wrappedDefineProperty
  });

module.exports = function (TYPE, wrapper, CLAMPED) {
    var BYTES = TYPE.match(/\d+$/)[0] / 8;
    var CONSTRUCTOR_NAME = TYPE + (CLAMPED ? 'Clamped' : '') + 'Array';
    var GETTER = 'get' + TYPE;
    var SETTER = 'set' + TYPE;
    var NativeTypedArrayConstructor = global[CONSTRUCTOR_NAME];
    var TypedArrayConstructor = NativeTypedArrayConstructor;
    var TypedArrayConstructorPrototype = TypedArrayConstructor && TypedArrayConstructor.prototype;
    var exported = {};

var getter = function (that, index) {
      var data = getInternalState(that);
      return data.view[GETTER](index * BYTES + data.byteOffset, true);
    };

var setter = function (that, index, value) {
      var data = getInternalState(that);
      if (CLAMPED) value = (value = round(value)) < 0 ? 0 : value > 0xFF ? 0xFF : value & 0xFF;
      data.view[SETTER](index * BYTES + data.byteOffset, value, true);
    };

if (!NATIVE_ARRAY_BUFFER_VIEWS) {
      TypedArrayConstructor = wrapper(function (that, data, offset, $length) {
        anInstance(that, TypedArrayConstructorPrototype);
        var index = 0;
        var byteOffset = 0;
        var buffer, byteLength, length;
        if (!isObject(data)) {
          length = toIndex(data);
          byteLength = length * BYTES;
          buffer = new ArrayBuffer(byteLength);
        } else if (isArrayBuffer(data)) {
          buffer = data;
          byteOffset = toOffset(offset, BYTES);
          var $len = data.byteLength;
          if ($length === undefined) {
            if ($len % BYTES) throw RangeError(WRONG_LENGTH);
            byteLength = $len - byteOffset;
            if (byteLength < 0) throw RangeError(WRONG_LENGTH);
          } else {
            byteLength = toLength($length) * BYTES;
            if (byteLength + byteOffset > $len) throw RangeError(WRONG_LENGTH);
          }
          length = byteLength / BYTES;
        } else if (isTypedArray(data)) {
          return fromList(TypedArrayConstructor, data);
        } else {
          return call(typedArrayFrom, TypedArrayConstructor, data);
        }
        setInternalState(that, {
          buffer: buffer,
          byteOffset: byteOffset,
          byteLength: byteLength,
          length: length,
          view: new DataView(buffer)
        });
        while (index < length) addElement(that, index++);
      });

if (setPrototypeOf) setPrototypeOf(TypedArrayConstructor, TypedArray);
      TypedArrayConstructorPrototype = TypedArrayConstructor.prototype = create(TypedArrayPrototype);
    } else if (TYPED_ARRAYS_CONSTRUCTORS_REQUIRES_WRAPPERS) {
      TypedArrayConstructor = wrapper(function (dummy, data, typedArrayOffset, $length) {
        anInstance(dummy, TypedArrayConstructorPrototype);
        return inheritIfRequired(function () {
          if (!isObject(data)) return new NativeTypedArrayConstructor(toIndex(data));
          if (isArrayBuffer(data)) return $length !== undefined
            ? new NativeTypedArrayConstructor(data, toOffset(typedArrayOffset, BYTES), $length)
            : typedArrayOffset !== undefined
              ? new NativeTypedArrayConstructor(data, toOffset(typedArrayOffset, BYTES))
              : new NativeTypedArrayConstructor(data);
          if (isTypedArray(data)) return fromList(TypedArrayConstructor, data);
          return call(typedArrayFrom, TypedArrayConstructor, data);
        }(), dummy, TypedArrayConstructor);
      });

if (setPrototypeOf) setPrototypeOf(TypedArrayConstructor, TypedArray);
      forEach(getOwnPropertyNames(NativeTypedArrayConstructor), function (key) {
        if (!(key in TypedArrayConstructor)) {
          createNonEnumerableProperty(TypedArrayConstructor, key, NativeTypedArrayConstructor[key]);
        }
      });
      TypedArrayConstructor.prototype = TypedArrayConstructorPrototype;
    }

if (TypedArrayConstructorPrototype.constructor !== TypedArrayConstructor) {
      createNonEnumerableProperty(TypedArrayConstructorPrototype, 'constructor', TypedArrayConstructor);
    }

enforceInternalState(TypedArrayConstructorPrototype).TypedArrayConstructor = TypedArrayConstructor;

if (TYPED_ARRAY_TAG) {
      createNonEnumerableProperty(TypedArrayConstructorPrototype, TYPED_ARRAY_TAG, CONSTRUCTOR_NAME);
    }

var FORCED = TypedArrayConstructor != NativeTypedArrayConstructor;

exported[CONSTRUCTOR_NAME] = TypedArrayConstructor;

$({ global: true, constructor: true, forced: FORCED, sham: !NATIVE_ARRAY_BUFFER_VIEWS }, exported);

if (!(BYTES_PER_ELEMENT in TypedArrayConstructor)) {
      createNonEnumerableProperty(TypedArrayConstructor, BYTES_PER_ELEMENT, BYTES);
    }

if (!(BYTES_PER_ELEMENT in TypedArrayConstructorPrototype)) {
      createNonEnumerableProperty(TypedArrayConstructorPrototype, BYTES_PER_ELEMENT, BYTES);
    }

setSpecies(CONSTRUCTOR_NAME);
  };
} else module.exports = function () { /* empty */ };

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