"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});

exports.default = function (ast, strictCode, env, realm, thrownValue) {
  (0, _invariant2.default)(thrownValue instanceof _completions.ThrowCompletion, "Metadata isn't a throw completion");

  // 1. Let oldEnv be the running execution context's LexicalEnvironment.
  var oldEnv = realm.getRunningContext().lexicalEnvironment;

  // 2. Let catchEnv be NewDeclarativeEnvironment(oldEnv).
  var catchEnv = _singletons.Environment.NewDeclarativeEnvironment(realm, oldEnv);

  // 3. Let catchEnvRec be catchEnv's EnvironmentRecord.
  var catchEnvRec = catchEnv.environmentRecord;

  // 4. For each element argName of the BoundNames of CatchParameter, do
  var _iteratorNormalCompletion = true;
  var _didIteratorError = false;
  var _iteratorError = undefined;

  try {
    for (var _iterator = _singletons.Environment.BoundNames(realm, ast.param)[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
      var argName = _step.value;

      // a. Perform ! catchEnvRec.CreateMutableBinding(argName, false).
      catchEnvRec.CreateMutableBinding(argName, false);
    }

    // 5. Set the running execution context's LexicalEnvironment to catchEnv.
  } catch (err) {
    _didIteratorError = true;
    _iteratorError = err;
  } finally {
    try {
      if (!_iteratorNormalCompletion && _iterator.return) {
        _iterator.return();
      }
    } finally {
      if (_didIteratorError) {
        throw _iteratorError;
      }
    }
  }

  realm.getRunningContext().lexicalEnvironment = catchEnv;

  try {
    // 6. Let status be the result of performing BindingInitialization for CatchParameter passing thrownValue and catchEnv as arguments.
    _singletons.Environment.BindingInitialization(realm, ast.param, thrownValue.value, strictCode, catchEnv);

    // 7. If status is an abrupt completion, then
    // a. Set the running execution context's LexicalEnvironment to oldEnv.
    // b. Return Completion(status).

    // 8. Let B be the result of evaluating Block.
    var B = catchEnv.evaluate(ast.body, strictCode);
    (0, _invariant2.default)(B instanceof _index.Value);

    // 10. Return Completion(B).
    return B;
  } finally {
    // 9. Set the running execution context's LexicalEnvironment to oldEnv.
    realm.getRunningContext().lexicalEnvironment = oldEnv;
    realm.onDestroyScope(catchEnv);
  }
};

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

var _completions = require("../completions.js");

var _invariant = require("../invariant.js");

var _invariant2 = _interopRequireDefault(_invariant);

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

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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