prepack/lib/intrinsics/ecma262/ObjectProto_toString.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 _is = require("../../methods/is.js");

var _get = require("../../methods/get.js");

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

/**
 * 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 22.1.3.30
  return new _index.NativeFunctionValue(realm, "Object.prototype.toString", "toString", 0, context => {
    // 1. If the this value is undefined, return "[object Undefined]".
    if (context instanceof _index.UndefinedValue) return new _index.StringValue(realm, "[object Undefined]"); // 2. If the this value is null, return "[object Null]".

    if (context instanceof _index.NullValue) return new _index.StringValue(realm, "[object Null]"); // 3. Let O be ToObject(this value).

    let O = _singletons.To.ToObject(realm, context);

    let builtinTag; // 4. Let isArray be ? IsArray(O).

    let isArray = (0, _is.IsArray)(realm, O); // 5. If isArray is true, let builtinTag be "Array".

    if (isArray) builtinTag = "Array";else if (O.$StringData !== undefined) // 6. Else, if O is an exotic String object, let builtinTag be "String".
      builtinTag = "String";else if (O.$ParameterMap !== undefined) // 7. Else, if O has an [[ParameterMap]] internal slot, let builtinTag be "Arguments".
      builtinTag = "Arguments";else if (O.$Call !== undefined) // 8. Else, if O has a [[Call]] internal method, let builtinTag be "Function".
      builtinTag = "Function";else if (O.$ErrorData !== undefined) // 9. Else, if O has an [[ErrorData]] internal slot, let builtinTag be "Error".
      builtinTag = "Error";else if (O.$BooleanData !== undefined) // 10. Else, if O has a [[BooleanData]] internal slot, let builtinTag be "Boolean".
      builtinTag = "Boolean";else if (O.$NumberData !== undefined) // 11. Else, if O has a [[NumberData]] internal slot, let builtinTag be "Number".
      builtinTag = "Number";else if (O.$DateValue !== undefined) // 12. Else, if O has a [[DateValue]] internal slot, let builtinTag be "Date".
      builtinTag = "Date";else if (O.$RegExpMatcher !== undefined) // 13. Else, if O has a [[RegExpMatcher]] internal slot, let builtinTag be "RegExp".
      builtinTag = "RegExp";else {
      // 14. Else, let builtinTag be "Object".
      builtinTag = "Object";
    } // 15. Let tag be ? Get(O, @@toStringTag).

    let tag = (0, _get.Get)(realm, O, realm.intrinsics.SymbolToStringTag); // 16. If Type(tag) is not String, let tag be builtinTag.

    tag = tag instanceof _index.StringValue ? tag.value : builtinTag; // 17. Return the String that is the result of concatenating "[object ", tag, and "]".

    return new _index.StringValue(realm, `[object ${tag}]`);
  }, false);
}
//# sourceMappingURL=ObjectProto_toString.js.map