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Viewing file:     iterator-create-proxy.js (2.2 KB)      -rwxrwxr-x

'use strict';
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var anObject = require('../internals/an-object');
var create = require('../internals/object-create');
var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
var redefineAll = require('../internals/redefine-all');
var wellKnownSymbol = require('../internals/well-known-symbol');
var InternalStateModule = require('../internals/internal-state');
var getMethod = require('../internals/get-method');
var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;

var ITERATOR_PROXY = 'IteratorProxy';
var setInternalState = InternalStateModule.set;
var getInternalState = InternalStateModule.getterFor(ITERATOR_PROXY);

var TO_STRING_TAG = wellKnownSymbol('toStringTag');

module.exports = function (nextHandler, IS_ITERATOR) {
  var IteratorProxy = function Iterator(state) {
    state.type = ITERATOR_PROXY;
    state.next = aCallable(state.iterator.next);
    state.done = false;
    state.ignoreArg = !IS_ITERATOR;
    setInternalState(this, state);
  };

  IteratorProxy.prototype = redefineAll(create(IteratorPrototype), {
    next: function next(arg) {
      var state = getInternalState(this);
      var args = arguments.length ? [state.ignoreArg ? undefined : arg] : IS_ITERATOR ? [] : [undefined];
      state.ignoreArg = false;
      var result = state.done ? undefined : call(nextHandler, state, args);
      return { done: state.done, value: result };
    },
    'return': function (value) {
      var state = getInternalState(this);
      var iterator = state.iterator;
      state.done = true;
      var $$return = getMethod(iterator, 'return');
      return { done: true, value: $$return ? anObject(call($$return, iterator, value)).value : value };
    },
    'throw': function (value) {
      var state = getInternalState(this);
      var iterator = state.iterator;
      state.done = true;
      var $$throw = getMethod(iterator, 'throw');
      if ($$throw) return call($$throw, iterator, value);
      throw value;
    }
  });

  if (!IS_ITERATOR) {
    createNonEnumerableProperty(IteratorProxy.prototype, TO_STRING_TAG, 'Generator');
  }

  return IteratorProxy;
};