prepack/lib/evaluators/VariableDeclaration.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 _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 13.3.1.4
function letAndConst(ast, strictCode, env, realm) {
  for (let declar of ast.declarations) {
    let Initializer = declar.init;

    if (declar.id.type === "Identifier" && !Initializer) {
      (0, _invariant.default)(ast.kind !== "const", "const without an initializer"); // 1. Let lhs be ResolveBinding(StringValue of BindingIdentifier).

      let bindingId = declar.id.name;

      let lhs = _singletons.Environment.ResolveBinding(realm, bindingId, strictCode); // 2. Return InitializeReferencedBinding(lhs, undefined).


      _singletons.Environment.InitializeReferencedBinding(realm, lhs, realm.intrinsics.undefined);

      continue;
    } else if (declar.id.type === "Identifier" && Initializer) {
      // 1. Let bindingId be StringValue of BindingIdentifier.
      let bindingId = declar.id.name; // 2. Let lhs be ResolveBinding(bindingId).

      let lhs = _singletons.Environment.ResolveBinding(realm, bindingId, strictCode); // 3. Let rhs be the result of evaluating Initializer.


      let rhs = env.evaluate(Initializer, strictCode); // 4. Let value be ? GetValue(rhs).

      let value = _singletons.Environment.GetValue(realm, rhs); // 5. If IsAnonymousFunctionDefinition(Initializer) is true, then


      if ((0, _index2.IsAnonymousFunctionDefinition)(realm, Initializer)) {
        (0, _invariant.default)(value instanceof _index.ObjectValue); // a. Let hasNameProperty be ? HasOwnProperty(value, "name").

        let hasNameProperty = (0, _index2.HasOwnProperty)(realm, value, "name"); // b. If hasNameProperty is false, perform SetFunctionName(value, bindingId).

        if (!hasNameProperty) _singletons.Functions.SetFunctionName(realm, value, new _index.StringValue(realm, bindingId));
      } // 6. Return InitializeReferencedBinding(lhs, value).


      _singletons.Environment.InitializeReferencedBinding(realm, lhs, value);
    } else if ((declar.id.type === "ObjectPattern" || declar.id.type === "ArrayPattern") && Initializer) {
      // 1. Let rhs be the result of evaluating Initializer.
      let rhs = env.evaluate(Initializer, strictCode); // 2. Let rval be ? GetValue(rhs).

      let rval = _singletons.Environment.GetValue(realm, rhs); // 3. Let env be the running execution context’s LexicalEnvironment.
      // 4. Return the result of performing BindingInitialization for BindingPattern using value and env as the arguments.


      _singletons.Environment.BindingInitialization(realm, declar.id, rval, strictCode, env);
    } else {
      (0, _invariant.default)(false, "unrecognized declaration");
    }
  }

  return realm.intrinsics.empty;
} // ECMA262 13.3.2.4


function _default(ast, strictCode, env, realm) {
  if (ast.kind === "let" || ast.kind === "const") {
    return letAndConst(ast, strictCode, env, realm);
  }

  for (let declar of ast.declarations) {
    let Initializer = declar.init;

    if (declar.id.type === "Identifier" && !Initializer) {
      // VariableDeclaration : BindingIdentifier
      // 1. Return NormalCompletion(empty).
      continue;
    } else if (declar.id.type === "Identifier" && Initializer) {
      // VariableDeclaration : BindingIdentifier Initializer
      // 1. Let bindingId be StringValue of BindingIdentifier.
      let bindingId = declar.id.name; // 2. Let lhs be ? ResolveBinding(bindingId).

      let lhs = _singletons.Environment.ResolveBinding(realm, bindingId, strictCode); // 3. Let rhs be the result of evaluating Initializer.


      let rhs = env.evaluate(Initializer, strictCode); // 4. Let value be ? GetValue(rhs).

      let value = _singletons.Environment.GetValue(realm, rhs);

      if (declar.id && declar.id.name !== undefined) value.__originalName = bindingId; // 5. If IsAnonymousFunctionDefinition(Initializer) is true, then

      if ((0, _index2.IsAnonymousFunctionDefinition)(realm, Initializer)) {
        (0, _invariant.default)(value instanceof _index.ObjectValue); // a. Let hasNameProperty be ? HasOwnProperty(value, "name").

        let hasNameProperty = (0, _index2.HasOwnProperty)(realm, value, "name"); // b. If hasNameProperty is false, perform SetFunctionName(value, bindingId).

        if (!hasNameProperty) _singletons.Functions.SetFunctionName(realm, value, new _index.StringValue(realm, bindingId));
      } // 6. Return ? PutValue(lhs, value).


      _singletons.Properties.PutValue(realm, lhs, value);
    } else if ((declar.id.type === "ObjectPattern" || declar.id.type === "ArrayPattern") && Initializer) {
      // 1. Let rhs be the result of evaluating Initializer.
      let rhs = env.evaluate(Initializer, strictCode); // 2. Let rval be ? GetValue(rhs).

      let rval = _singletons.Environment.GetValue(realm, rhs); // 3. Return the result of performing BindingInitialization for BindingPattern passing rval and undefined as arguments.


      _singletons.Environment.BindingInitialization(realm, declar.id, rval, strictCode, undefined);
    } else {
      (0, _invariant.default)(false, "unrecognized declaration");
    }
  }

  return realm.intrinsics.empty;
}
//# sourceMappingURL=VariableDeclaration.js.map