array-buffer-view-core.js

'use strict';
var NATIVE_ARRAY_BUFFER = require('../internals/array-buffer-native');
var DESCRIPTORS = require('../internals/descriptors');
var global = require('../internals/global');
var isCallable = require('../internals/is-callable');
var isObject = require('../internals/is-object');
var hasOwn = require('../internals/has-own-property');
var classof = require('../internals/classof');
var tryToString = require('../internals/try-to-string');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var defineBuiltIn = require('../internals/define-built-in');
var defineProperty = require('../internals/object-define-property').f;
var isPrototypeOf = require('../internals/object-is-prototype-of');
var getPrototypeOf = require('../internals/object-get-prototype-of');
var setPrototypeOf = require('../internals/object-set-prototype-of');
var wellKnownSymbol = require('../internals/well-known-symbol');
var uid = require('../internals/uid');
var InternalStateModule = require('../internals/internal-state');

var enforceInternalState = InternalStateModule.enforce;
var getInternalState = InternalStateModule.get;
var Int8Array = global.Int8Array;
var Int8ArrayPrototype = Int8Array && Int8Array.prototype;
var Uint8ClampedArray = global.Uint8ClampedArray;
var Uint8ClampedArrayPrototype = Uint8ClampedArray && Uint8ClampedArray.prototype;
var TypedArray = Int8Array && getPrototypeOf(Int8Array);
var TypedArrayPrototype = Int8ArrayPrototype && getPrototypeOf(Int8ArrayPrototype);
var ObjectPrototype = Object.prototype;
var TypeError = global.TypeError;

var TO_STRING_TAG = wellKnownSymbol('toStringTag');
var TYPED_ARRAY_TAG = uid('TYPED_ARRAY_TAG');
var TYPED_ARRAY_CONSTRUCTOR = 'TypedArrayConstructor';
// Fixing native typed arrays in Opera Presto crashes the browser, see #595
var NATIVE_ARRAY_BUFFER_VIEWS = NATIVE_ARRAY_BUFFER && !!setPrototypeOf && classof(global.opera) !== 'Opera';
var TYPED_ARRAY_TAG_REQUIRED = false;
var NAME, Constructor, Prototype;

var TypedArrayConstructorsList = {
  Int8Array: 1,
  Uint8Array: 1,
  Uint8ClampedArray: 1,
  Int16Array: 2,
  Uint16Array: 2,
  Int32Array: 4,
  Uint32Array: 4,
  Float32Array: 4,
  Float64Array: 8
};

var BigIntArrayConstructorsList = {
  BigInt64Array: 8,
  BigUint64Array: 8
};

var isView = function isView(it) {
  if (!isObject(it)) return false;
  var klass = classof(it);
  return klass === 'DataView'
    || hasOwn(TypedArrayConstructorsList, klass)
    || hasOwn(BigIntArrayConstructorsList, klass);
};

var getTypedArrayConstructor = function (it) {
  var proto = getPrototypeOf(it);
  if (!isObject(proto)) return;
  var state = getInternalState(proto);
  if (state && hasOwn(state, TYPED_ARRAY_CONSTRUCTOR)) return state[TYPED_ARRAY_CONSTRUCTOR];
  return getTypedArrayConstructor(proto);
};

var isTypedArray = function (it) {
  if (!isObject(it)) return false;
  var klass = classof(it);
  return hasOwn(TypedArrayConstructorsList, klass)
    || hasOwn(BigIntArrayConstructorsList, klass);
};

var aTypedArray = function (it) {
  if (isTypedArray(it)) return it;
  throw TypeError('Target is not a typed array');
};

var aTypedArrayConstructor = function (C) {
  if (isCallable(C) && (!setPrototypeOf || isPrototypeOf(TypedArray, C))) return C;
  throw TypeError(tryToString(C) + ' is not a typed array constructor');
};

var exportTypedArrayMethod = function (KEY, property, forced, options) {
  if (!DESCRIPTORS) return;
  if (forced) for (var ARRAY in TypedArrayConstructorsList) {
    var TypedArrayConstructor = global[ARRAY];
    if (TypedArrayConstructor && hasOwn(TypedArrayConstructor.prototype, KEY)) try {
      delete TypedArrayConstructor.prototype[KEY];
    } catch (error) {
      // old WebKit bug - some methods are non-configurable
      try {
        TypedArrayConstructor.prototype[KEY] = property;
      } catch (error2) { /* empty */ }
    }
  }
  if (!TypedArrayPrototype[KEY] || forced) {
    defineBuiltIn(TypedArrayPrototype, KEY, forced ? property
      : NATIVE_ARRAY_BUFFER_VIEWS && Int8ArrayPrototype[KEY] || property, options);
  }
};

var exportTypedArrayStaticMethod = function (KEY, property, forced) {
  var ARRAY, TypedArrayConstructor;
  if (!DESCRIPTORS) return;
  if (setPrototypeOf) {
    if (forced) for (ARRAY in TypedArrayConstructorsList) {
      TypedArrayConstructor = global[ARRAY];
      if (TypedArrayConstructor && hasOwn(TypedArrayConstructor, KEY)) try {
        delete TypedArrayConstructor[KEY];
      } catch (error) { /* empty */ }
    }
    if (!TypedArray[KEY] || forced) {
      // V8 ~ Chrome 49-50 `%TypedArray%` methods are non-writable non-configurable
      try {
        return defineBuiltIn(TypedArray, KEY, forced ? property : NATIVE_ARRAY_BUFFER_VIEWS && TypedArray[KEY] || property);
      } catch (error) { /* empty */ }
    } else return;
  }
  for (ARRAY in TypedArrayConstructorsList) {
    TypedArrayConstructor = global[ARRAY];
    if (TypedArrayConstructor && (!TypedArrayConstructor[KEY] || forced)) {
      defineBuiltIn(TypedArrayConstructor, KEY, property);
    }
  }
};

for (NAME in TypedArrayConstructorsList) {
  Constructor = global[NAME];
  Prototype = Constructor && Constructor.prototype;
  if (Prototype) enforceInternalState(Prototype)[TYPED_ARRAY_CONSTRUCTOR] = Constructor;
  else NATIVE_ARRAY_BUFFER_VIEWS = false;
}

for (NAME in BigIntArrayConstructorsList) {
  Constructor = global[NAME];
  Prototype = Constructor && Constructor.prototype;
  if (Prototype) enforceInternalState(Prototype)[TYPED_ARRAY_CONSTRUCTOR] = Constructor;
}

// WebKit bug - typed arrays constructors prototype is Object.prototype
if (!NATIVE_ARRAY_BUFFER_VIEWS || !isCallable(TypedArray) || TypedArray === Function.prototype) {
  // eslint-disable-next-line no-shadow -- safe
  TypedArray = function TypedArray() {
    throw TypeError('Incorrect invocation');
  };
  if (NATIVE_ARRAY_BUFFER_VIEWS) for (NAME in TypedArrayConstructorsList) {
    if (global[NAME]) setPrototypeOf(global[NAME], TypedArray);
  }
}

if (!NATIVE_ARRAY_BUFFER_VIEWS || !TypedArrayPrototype || TypedArrayPrototype === ObjectPrototype) {
  TypedArrayPrototype = TypedArray.prototype;
  if (NATIVE_ARRAY_BUFFER_VIEWS) for (NAME in TypedArrayConstructorsList) {
    if (global[NAME]) setPrototypeOf(global[NAME].prototype, TypedArrayPrototype);
  }
}

// WebKit bug - one more object in Uint8ClampedArray prototype chain
if (NATIVE_ARRAY_BUFFER_VIEWS && getPrototypeOf(Uint8ClampedArrayPrototype) !== TypedArrayPrototype) {
  setPrototypeOf(Uint8ClampedArrayPrototype, TypedArrayPrototype);
}

if (DESCRIPTORS && !hasOwn(TypedArrayPrototype, TO_STRING_TAG)) {
  TYPED_ARRAY_TAG_REQUIRED = true;
  defineProperty(TypedArrayPrototype, TO_STRING_TAG, { get: function () {
    return isObject(this) ? this[TYPED_ARRAY_TAG] : undefined;
  } });
  for (NAME in TypedArrayConstructorsList) if (global[NAME]) {
    createNonEnumerableProperty(global[NAME], TYPED_ARRAY_TAG, NAME);
  }
}

module.exports = {
  NATIVE_ARRAY_BUFFER_VIEWS: NATIVE_ARRAY_BUFFER_VIEWS,
  TYPED_ARRAY_TAG: TYPED_ARRAY_TAG_REQUIRED && TYPED_ARRAY_TAG,
  aTypedArray: aTypedArray,
  aTypedArrayConstructor: aTypedArrayConstructor,
  exportTypedArrayMethod: exportTypedArrayMethod,
  exportTypedArrayStaticMethod: exportTypedArrayStaticMethod,
  getTypedArrayConstructor: getTypedArrayConstructor,
  isView: isView,
  isTypedArray: isTypedArray,
  TypedArray: TypedArray,
  TypedArrayPrototype: TypedArrayPrototype
};