prepack/lib/intrinsics/ecma262/ArrayBufferPrototype.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("../../values/index.js");

var _index2 = require("../../methods/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, obj) {
  // ECMA262 24.1.4.1
  obj.defineNativeGetter("byteLength", context => {
    // 1. Let O be the this value.
    let O = context.throwIfNotConcrete(); // 2. If Type(O) is not Object, throw a TypeError exception.

    if (!(O instanceof _index.ObjectValue)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "Type(O) is not Object");
    } // 3. If O does not have an [[ArrayBufferData]] internal slot, throw a TypeError exception.


    if (!("$ArrayBufferData" in O)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "O does not have an [[ArrayBufferData]] internal slot");
    } // 4. If IsDetachedBuffer(O) is true, throw a TypeError exception.


    if ((0, _index2.IsDetachedBuffer)(realm, O) === true) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "IsDetachedBuffer(O) is true");
    } // 5. Let length be O.[[ArrayBufferByteLength]].


    let length = O.$ArrayBufferByteLength;
    (0, _invariant.default)(typeof length === "number"); // 6. Return length.

    return new _index.NumberValue(realm, length);
  }); // ECMA262 24.1.4.3

  obj.defineNativeMethod("slice", 2, (context, [start, end]) => {
    // 1. Let O be the this value.
    let O = context.throwIfNotConcrete(); // 2. If Type(O) is not Object, throw a TypeError exception.

    if (!(O instanceof _index.ObjectValue)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "Type(O) is not Object");
    } // 3. If O does not have an [[ArrayBufferData]] internal slot, throw a TypeError exception.


    if (!("$ArrayBufferData" in O)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "O does not have an [[ArrayBufferData]] internal slot");
    } // 4. If IsDetachedBuffer(O) is true, throw a TypeError exception.


    if ((0, _index2.IsDetachedBuffer)(realm, O) === true) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "IsDetachedBuffer(O) is true");
    } // 5. Let len be O.[[ArrayBufferByteLength]].


    let len = O.$ArrayBufferByteLength;
    (0, _invariant.default)(typeof len === "number"); // 6. Let relativeStart be ? ToInteger(start).

    let relativeStart = _singletons.To.ToInteger(realm, start); // 7. If relativeStart < 0, let first be max((len + relativeStart), 0); else let first be min(relativeStart, len).


    let first = relativeStart < 0 ? Math.max(len + relativeStart, 0) : Math.min(relativeStart, len); // 8. If end is undefined, let relativeEnd be len; else let relativeEnd be ? ToInteger(end).

    let relativeEnd = !end || end instanceof _index.UndefinedValue ? len : _singletons.To.ToInteger(realm, end.throwIfNotConcrete()); // 9. If relativeEnd < 0, let final be max((len + relativeEnd), 0); else let final be min(relativeEnd, len).

    let final = relativeEnd < 0 ? Math.max(len + relativeEnd, 0) : Math.min(relativeEnd, len); // 10. Let newLen be max(final-first, 0).

    let newLen = Math.max(final - first, 0); // 11. Let ctor be ? SpeciesConstructor(O, %ArrayBuffer%).

    let ctor = (0, _index2.SpeciesConstructor)(realm, O, realm.intrinsics.ArrayBuffer); // 12. Let New be ? Construct(ctor, « newLen »).

    let New = (0, _index2.Construct)(realm, ctor, [new _index.NumberValue(realm, newLen)]).throwIfNotConcreteObject(); // 13. If New does not have an [[ArrayBufferData]] internal slot, throw a TypeError exception.

    if (!("$ArrayBufferData" in New)) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "new does not have an [[ArrayBufferData]] internal slot");
    } // 14. If IsDetachedBuffer(New) is true, throw a TypeError exception.


    if ((0, _index2.IsDetachedBuffer)(realm, New) === true) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "IsDetachedBuffer(new) is true");
    } // 15. If SameValue(New, O) is true, throw a TypeError exception.


    if ((0, _index2.SameValue)(realm, New, O) === true) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "SameValue(new, O) is true");
    } // 16. If new.[[ArrayBufferByteLength]] < newLen, throw a TypeError exception.


    if (typeof New.$ArrayBufferByteLength !== "number" || New.$ArrayBufferByteLength < newLen) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "new.[[ArrayBufferByteLength]] < newLen");
    } // 17. NOTE: Side-effects of the above steps may have detached O.
    // 18. If IsDetachedBuffer(O) is true, throw a TypeError exception.


    if ((0, _index2.IsDetachedBuffer)(realm, O) === true) {
      throw realm.createErrorThrowCompletion(realm.intrinsics.TypeError, "IsDetachedBuffer(O) is true");
    } // 19. Let fromBuf be O.[[ArrayBufferData]].


    let fromBuf = O.$ArrayBufferData;
    (0, _invariant.default)(fromBuf); // 20. Let toBuf be New.[[ArrayBufferData]].

    let toBuf = New.$ArrayBufferData;
    (0, _invariant.default)(toBuf); // 21. Perform CopyDataBlockBytes(toBuf, 0, fromBuf, first, newLen).

    (0, _index2.CopyDataBlockBytes)(realm, toBuf, 0, fromBuf, first, newLen); // 22. Return New.

    return New;
  }); // ECMA262 24.1.4.4

  obj.defineNativeProperty(realm.intrinsics.SymbolToStringTag, new _index.StringValue(realm, "ArrayBuffer"), {
    writable: false
  });
}
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