prepack/lib/evaluators/ConditionalExpression.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 _realm = require("../realm.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 _default(ast, strictCode, env, realm) {
  let exprRef = env.evaluate(ast.test, strictCode);

  let exprValue = _singletons.Environment.GetConditionValue(realm, exprRef);

  if (exprValue instanceof _index.ConcreteValue) {
    if (_singletons.To.ToBoolean(realm, exprValue)) {
      return env.evaluate(ast.consequent, strictCode);
    } else {
      return env.evaluate(ast.alternate, strictCode);
    }
  }

  (0, _invariant.default)(exprValue instanceof _index.AbstractValue);
  const consequent = ast.consequent;
  const alternate = ast.alternate;
  if (!exprValue.mightNotBeTrue()) return env.evaluate(consequent, strictCode);
  if (!exprValue.mightNotBeFalse()) return env.evaluate(alternate, strictCode);
  return realm.evaluateWithAbstractConditional(exprValue, () => realm.evaluateNodeForEffects(consequent, strictCode, env), () => alternate ? realm.evaluateNodeForEffects(alternate, strictCode, env) : (0, _realm.construct_empty_effects)(realm));
}
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