prepack/lib/evaluators/BlockStatement.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 _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 */
// ECMA262 13.2.13
function _default(ast, strictCode, env, realm) {
  // 1. Let oldEnv be the running execution context's LexicalEnvironment.
  let oldEnv = realm.getRunningContext().lexicalEnvironment; // 2. Let blockEnv be NewDeclarativeEnvironment(oldEnv).

  let blockEnv = _singletons.Environment.NewDeclarativeEnvironment(realm, oldEnv); // 3. Perform BlockDeclarationInstantiation(StatementList, blockEnv).


  _singletons.Environment.BlockDeclarationInstantiation(realm, strictCode, ast.body, blockEnv); // 4. Set the running execution context's LexicalEnvironment to blockEnv.


  realm.getRunningContext().lexicalEnvironment = blockEnv;

  try {
    // 5. Let blockValue be the result of evaluating StatementList.
    let blockValue;

    if (ast.directives) {
      for (let directive of ast.directives) {
        blockValue = new _index.StringValue(realm, directive.value.value);
      }
    }

    return _singletons.Functions.EvaluateStatements(ast.body, blockValue, strictCode, blockEnv, realm);
  } finally {
    // 6. Set the running execution context's LexicalEnvironment to oldEnv.
    realm.getRunningContext().lexicalEnvironment = oldEnv;
    realm.onDestroyScope(blockEnv);
  }
}
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