core-js/internals/typed-array-constructor.js

'use strict';
var $ = require('../internals/export');
var global = require('../internals/global');
var DESCRIPTORS = require('../internals/descriptors');
var TYPED_ARRAYS_CONSTRUCTORS_REQUIRES_WRAPPERS = require('../internals/typed-arrays-constructors-requires-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 toLength = require('../internals/to-length');
var toIndex = require('../internals/to-index');
var toOffset = require('../internals/to-offset');
var toPrimitive = require('../internals/to-primitive');
var has = require('../internals/has');
var classof = require('../internals/classof');
var isObject = require('../internals/is-object');
var create = require('../internals/object-create');
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 getInternalState = InternalStateModule.get;
var setInternalState = InternalStateModule.set;
var nativeDefineProperty = definePropertyModule.f;
var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
var round = Math.round;
var RangeError = global.RangeError;
var ArrayBuffer = ArrayBufferModule.ArrayBuffer;
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) {
  var index = 0;
  var length = list.length;
  var result = new (aTypedArrayConstructor(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 it instanceof ArrayBuffer || (klass = classof(it)) == 'ArrayBuffer' || klass == 'SharedArrayBuffer';
};

var isTypedArrayIndex = function (target, key) {
  return isTypedArray(target)
    && typeof key != 'symbol'
    && key in target
    && String(+key) == String(key);
};

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

var wrappedDefineProperty = function defineProperty(target, key, descriptor) {
  if (isTypedArrayIndex(target, key = toPrimitive(key, true))
    && isObject(descriptor)
    && has(descriptor, 'value')
    && !has(descriptor, 'get')
    && !has(descriptor, 'set')
    // TODO: add validation descriptor w/o calling accessors
    && !descriptor.configurable
    && (!has(descriptor, 'writable') || descriptor.writable)
    && (!has(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, BYTES, wrapper, CLAMPED) {
    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);
    };

    var addElement = function (that, index) {
      nativeDefineProperty(that, index, {
        get: function () {
          return getter(this, index);
        },
        set: function (value) {
          return setter(this, index, value);
        },
        enumerable: true
      });
    };

    if (!NATIVE_ARRAY_BUFFER_VIEWS) {
      TypedArrayConstructor = wrapper(function (that, data, offset, $length) {
        anInstance(that, TypedArrayConstructor, CONSTRUCTOR_NAME);
        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 typedArrayFrom.call(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, TypedArrayConstructor, CONSTRUCTOR_NAME);
        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 typedArrayFrom.call(TypedArrayConstructor, data);
      });

      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);
    }

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

    exported[CONSTRUCTOR_NAME] = TypedArrayConstructor;

    $({
      global: true, forced: TypedArrayConstructor != NativeTypedArrayConstructor, 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 */ };