prepack/lib/evaluators/WithStatement.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 _errors = require("../errors.js");

var _completions = require("../completions.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 */
// ECMA262 13.11.7
function _default(ast, strictCode, env, realm) {
  // 1. Let val be the result of evaluating Expression.
  let val = env.evaluate(ast.object, strictCode); // 2. Let obj be ? ToObject(? GetValue(val)).

  val = _singletons.Environment.GetValue(realm, val);

  if (val instanceof _index.AbstractValue || val instanceof _index.ObjectValue && val.isPartialObject()) {
    let loc = ast.object.loc;
    let error = new _errors.CompilerDiagnostic("with object must be a known value", loc, "PP0007", "RecoverableError");
    if (realm.handleError(error) === "Fail") throw new _errors.FatalError();
  }

  let obj = _singletons.To.ToObject(realm, val); // 3. Let oldEnv be the running execution context's LexicalEnvironment.


  let oldEnv = env; // 4. Let newEnv be NewObjectEnvironment(obj, oldEnv).

  let newEnv = _singletons.Environment.NewObjectEnvironment(realm, obj, oldEnv); // 5. Set the withEnvironment flag of newEnv's EnvironmentRecord to true.


  (0, _invariant.default)(newEnv.environmentRecord instanceof _environment.ObjectEnvironmentRecord);
  newEnv.environmentRecord.withEnvironment = true; // 6. Set the running execution context's LexicalEnvironment to newEnv.

  realm.getRunningContext().lexicalEnvironment = newEnv;

  try {
    // 7. Let C be the result of evaluating Statement.
    let C = newEnv.evaluateCompletion(ast.body, strictCode);
    (0, _invariant.default)(C instanceof _index.Value || C instanceof _completions.AbruptCompletion); // 9. Return Completion(UpdateEmpty(C, undefined)).

    let res = (0, _index2.UpdateEmpty)(realm, C, realm.intrinsics.undefined);
    if (res instanceof _completions.AbruptCompletion) throw res;
    (0, _invariant.default)(res instanceof _index.Value);
    return res;
  } finally {
    // 8. Set the running execution context's LexicalEnvironment to oldEnv.
    realm.getRunningContext().lexicalEnvironment = oldEnv;
    realm.onDestroyScope(newEnv);
  }
}
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