prepack/lib/evaluators/MemberExpression.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 _environment = require("../environment.js");

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

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

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

var _SuperProperty = _interopRequireDefault(require("./SuperProperty"));

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 */
// ECMA262 12.3.2.1
function _default(ast, strictCode, env, realm) {
  if (ast.object.type === "Super") {
    return (0, _SuperProperty.default)(ast, strictCode, env, realm);
  } // 1. Let baseReference be the result of evaluating MemberExpression.


  let baseReference = env.evaluate(ast.object, strictCode); // 2. Let baseValue be ? GetValue(baseReference).

  let baseValue = _singletons.Environment.GetValue(realm, baseReference);

  let propertyNameValue;

  if (ast.computed === true) {
    // 3. Let propertyNameReference be the result of evaluating Expression.
    let propertyNameReference = env.evaluate(ast.property, strictCode); // 4. Let propertyNameValue be ? GetValue(propertyNameReference).

    propertyNameValue = _singletons.Environment.GetValue(realm, propertyNameReference);
  } else {
    // 3. Let propertyNameString be StringValue of IdentifierName.
    propertyNameValue = new _index.StringValue(realm, ast.property.name);
  } // 5. Let bv be ? RequireObjectCoercible(baseValue).


  let bv = (0, _index2.RequireObjectCoercible)(realm, baseValue, ast.object.loc); // 6. Let propertyKey be ? ToPropertyKey(propertyNameValue).

  let propertyKey = _singletons.To.ToPropertyKeyPartial(realm, propertyNameValue); // 7. 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; // 8. Return a value of type Reference whose base value is bv, whose referenced name is propertyKey, and whose strict reference flag is strict.

  return new _environment.Reference(bv, propertyKey, strict);
}
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