'use strict';
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var call = require('../internals/function-call');
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var create = require('../internals/object-create');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var defineBuiltIns = require('../internals/define-built-ins');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var InternalStateModule = require('../internals/internal-state');
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var getMethod = require('../internals/get-method');
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var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
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var createIterResultObject = require('../internals/create-iter-result-object');
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var iteratorClose = require('../internals/iterator-close');
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var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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var ITERATOR_HELPER = 'IteratorHelper';
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var WRAP_FOR_VALID_ITERATOR = 'WrapForValidIterator';
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var setInternalState = InternalStateModule.set;
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var createIteratorProxyPrototype = function (IS_ITERATOR) {
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var getInternalState = InternalStateModule.getterFor(IS_ITERATOR ? WRAP_FOR_VALID_ITERATOR : ITERATOR_HELPER);
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return defineBuiltIns(create(IteratorPrototype), {
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next: function next() {
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var state = getInternalState(this);
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// for simplification:
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// for `%WrapForValidIteratorPrototype%.next` or with `state.returnHandlerResult` our `nextHandler` returns `IterResultObject`
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// for `%IteratorHelperPrototype%.next` - just a value
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if (IS_ITERATOR) return state.nextHandler();
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if (state.done) return createIterResultObject(undefined, true);
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try {
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var result = state.nextHandler();
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return state.returnHandlerResult ? result : createIterResultObject(result, state.done);
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} catch (error) {
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state.done = true;
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throw error;
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}
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},
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'return': function () {
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var state = getInternalState(this);
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var iterator = state.iterator;
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state.done = true;
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if (IS_ITERATOR) {
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var returnMethod = getMethod(iterator, 'return');
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return returnMethod ? call(returnMethod, iterator) : createIterResultObject(undefined, true);
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}
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if (state.inner) try {
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iteratorClose(state.inner.iterator, 'normal');
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} catch (error) {
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return iteratorClose(iterator, 'throw', error);
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}
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if (iterator) iteratorClose(iterator, 'normal');
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return createIterResultObject(undefined, true);
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}
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});
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};
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var WrapForValidIteratorPrototype = createIteratorProxyPrototype(true);
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var IteratorHelperPrototype = createIteratorProxyPrototype(false);
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createNonEnumerableProperty(IteratorHelperPrototype, TO_STRING_TAG, 'Iterator Helper');
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module.exports = function (nextHandler, IS_ITERATOR, RETURN_HANDLER_RESULT) {
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var IteratorProxy = function Iterator(record, state) {
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if (state) {
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state.iterator = record.iterator;
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state.next = record.next;
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} else state = record;
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state.type = IS_ITERATOR ? WRAP_FOR_VALID_ITERATOR : ITERATOR_HELPER;
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state.returnHandlerResult = !!RETURN_HANDLER_RESULT;
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state.nextHandler = nextHandler;
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state.counter = 0;
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state.done = false;
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setInternalState(this, state);
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};
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IteratorProxy.prototype = IS_ITERATOR ? WrapForValidIteratorPrototype : IteratorHelperPrototype;
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return IteratorProxy;
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};
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