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'use strict';
var $ = require('../internals/export');
var createIteratorConstructor = require('../internals/create-iterator-constructor');
var requireObjectCoercible = require('../internals/require-object-coercible');
var toString = require('../internals/to-string');
var InternalStateModule = require('../internals/internal-state');
var StringMultibyteModule = require('../internals/string-multibyte');

var codeAt = StringMultibyteModule.codeAt;
var charAt = StringMultibyteModule.charAt;
var STRING_ITERATOR = 'String Iterator';
var setInternalState = InternalStateModule.set;
var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);

// TODO: unify with String#@@iterator
var $StringIterator = createIteratorConstructor(function StringIterator(string) {
  setInternalState(this, {
    type: STRING_ITERATOR,
    string: string,
    index: 0
  });
}, 'String', function next() {
  var state = getInternalState(this);
  var string = state.string;
  var index = state.index;
  var point;
  if (index >= string.length) return { value: undefined, done: true };
  point = charAt(string, index);
  state.index += point.length;
  return { value: { codePoint: codeAt(point, 0), position: index }, done: false };
});

// `String.prototype.codePoints` method
// https://github.com/tc39/proposal-string-prototype-codepoints
$({ target: 'String', proto: true }, {
  codePoints: function codePoints() {
    return new $StringIterator(toString(requireObjectCoercible(this)));
  }
});