prepack/lib/intrinsics/ecma262/DataView.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;

var _index = require("../../methods/index.js");

var _index2 = require("../../values/index.js");

var _singletons = require("../../singletons.js");

var _invariant = _interopRequireDefault(require("../../invariant.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

/*  strict-local */
function _default(realm) {
  // ECMA262 24.2.2.1
  let func = new _index2.NativeFunctionValue(realm, "DataView", "DataView", 3, (context, [_buffer, byteOffset, byteLength], argCount, NewTarget) => {
    let buffer = _buffer; // 1. If NewTarget is undefined, throw a TypeError exception.

    if (!NewTarget) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    }

    buffer = buffer.throwIfNotConcrete(); // 2. If Type(buffer) is not Object, throw a TypeError exception.

    if (!(buffer instanceof _index2.ObjectValue)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    } // 3. If buffer does not have an [[ArrayBufferData]] internal slot, throw a TypeError exception.


    if (!("$ArrayBufferData" in buffer)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    } // 4. Let offset be ? ToIndex(byteOffset).


    let offset = _singletons.To.ToIndexPartial(realm, byteOffset); // 5. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.


    if ((0, _index.IsDetachedBuffer)(realm, buffer)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError);
    } // 6. Let bufferByteLength be the value of buffer's [[ArrayBufferByteLength]] internal slot.


    let bufferByteLength = buffer.$ArrayBufferByteLength;
    (0, _invariant.default)(typeof bufferByteLength === "number"); // 7. If offset > bufferByteLength, throw a RangeError exception.

    if (offset > bufferByteLength) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.RangeError);
    } // 8. If byteLength is undefined, then


    let viewByteLength;

    if (!byteLength || byteLength instanceof _index2.UndefinedValue) {
      // a. Let viewByteLength be bufferByteLength - offset.
      viewByteLength = bufferByteLength - offset;
    } else {
      // 9. Else,
      // a. Let viewByteLength be ? ToIndex(byteLength).
      viewByteLength = _singletons.To.ToIndexPartial(realm, byteLength); // b. If offset+viewByteLength > bufferByteLength, throw a RangeError exception.

      if (offset + viewByteLength > bufferByteLength) {
        throw realm.createErrorThrowCompletion(realm.intrinsics.RangeError);
      }
    } // 10. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DataViewPrototype%", « [[DataView]], [[ViewedArrayBuffer]], [[ByteLength]], [[ByteOffset]] »).


    let O = _singletons.Create.OrdinaryCreateFromConstructor(realm, NewTarget, "DataViewPrototype", {
      $DataView: undefined,
      $ViewedArrayBuffer: undefined,
      $ByteLength: undefined,
      $ByteOffset: undefined
    }); // 11. Set O's [[DataView]] internal slot to true.


    O.$DataView = true; // 12. Set O's [[ViewedArrayBuffer]] internal slot to buffer.

    O.$ViewedArrayBuffer = buffer; // 13. Set O's [[ByteLength]] internal slot to viewByteLength.

    O.$ByteLength = viewByteLength; // 14. Set O's [[ByteOffset]] internal slot to offset.

    O.$ByteOffset = offset; // 15. Return O.

    return O;
  });
  return func;
}
//# sourceMappingURL=DataView.js.map