prepack/lib/evaluators/SuperProperty.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 = SuperProperty;

var _environment = require("../environment.js");

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 MakeSuperPropertyReference(realm, propertyKey, strict) {
  // 1. Let env be GetThisEnvironment( ).
  let env = _singletons.Environment.GetThisEnvironment(realm);

  (0, _invariant.default)(env instanceof _environment.FunctionEnvironmentRecord); // 2. If env.HasSuperBinding() is false, throw a ReferenceError exception.

  if (!env.HasSuperBinding()) {
    throw realm.createErrorThrowCompletion(realm.intrinsics.ReferenceError, "env does not have super binding");
  } // 3. Let actualThis be env.GetThisBinding().


  let actualThis = env.GetThisBinding(); // 4. ReturnIfAbrupt(actualThis).
  // 5. Let baseValue be env.GetSuperBase().

  let baseValue = env.GetSuperBase(); // 6. Let bv be RequireObjectCoercible(baseValue).

  let bv = (0, _index2.RequireObjectCoercible)(realm, baseValue); // 7. ReturnIfAbrupt(bv).
  // 8. Return a value of type Reference that is a Super Reference whose base value is bv, whose referenced name is propertyKey, whose thisValue is actualThis, and whose strict reference flag is strict.

  return new _environment.Reference(bv, propertyKey, strict, actualThis);
} // ECMA262 12.3.5.1


function SuperProperty(ast, strictCode, env, realm) {
  // SuperProperty : super [ Expression ]
  if (ast.computed === true) {
    // 1. Let propertyNameReference be the result of evaluating Expression.
    let propertyNameReference = env.evaluate(ast.property, strictCode); // 2. Let propertyNameValue be GetValue(propertyNameReference).

    let propertyNameValue = _singletons.Environment.GetValue(realm, propertyNameReference); // 3. Let propertyKey be ToPropertyKey(propertyNameValue).


    let propertyKey = _singletons.To.ToPropertyKeyPartial(realm, propertyNameValue); // 4. ReturnIfAbrupt(propertyKey).
    // 5. If the code matched by the syntactic production that is being evaluated is strict mode code, let strict be true, else let strict be false.


    let strict = strictCode; // 6. Return MakeSuperPropertyReference(propertyKey, strict).

    return MakeSuperPropertyReference(realm, propertyKey, strict);
  } else {
    // SuperProperty : super . IdentifierName
    // 1. Let propertyKey be StringValue of IdentifierName.
    let propertyKey = new _index.StringValue(realm, ast.property.name); // 2. If the code matched by the syntactic production that is being evaluated is strict mode code, let strict be true, else let strict be false.

    let strict = strictCode; // 3. Return MakeSuperPropertyReference(propertyKey, strict).

    return MakeSuperPropertyReference(realm, propertyKey, strict);
  }
}
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