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++ // Copyright (C) 2017 Crimson AS <info@crimson.no>
++ // Copyright (C) 2018 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
++ // Qt-Security score:significant
++
++ #include <private/qv4iterator_p.h>
++ #include <private/qv4stringiterator_p.h>
++ #include <private/qv4symbol_p.h>
++
++ using namespace QV4;
++
++ DEFINE_OBJECT_VTABLE(StringIteratorObject);
++
++ void StringIteratorPrototype::init(ExecutionEngine *e)
++ {
++ defineDefaultProperty(QStringLiteral("next"), method_next, 0);
++
++ Scope scope(e);
++ ScopedString val(scope, e->newString(QLatin1String("String Iterator")));
++ defineReadonlyConfigurableProperty(e->symbol_toStringTag(), val);
++ }
++
++ ReturnedValue StringIteratorPrototype::method_next(const FunctionObject *b, const Value *that, const Value *, int)
++ {
++ Scope scope(b);
++ const StringIteratorObject *thisObject = that->as<StringIteratorObject>();
++ if (!thisObject)
++ return scope.engine->throwTypeError(QLatin1String("Not an String Iterator instance"));
++
++ ScopedString s(scope, thisObject->d()->iteratedString);
++ if (!s) {
++ QV4::Value undefined = Value::undefinedValue();
++ return IteratorPrototype::createIterResultObject(scope.engine, undefined, true);
++ }
++
++ quint32 index = thisObject->d()->nextIndex;
++
++ QString str = s->toQString();
++ quint32 len = str.size();
++
++ if (index >= len) {
++ thisObject->d()->iteratedString.set(scope.engine, nullptr);
++ QV4::Value undefined = Value::undefinedValue();
++ return IteratorPrototype::createIterResultObject(scope.engine, undefined, true);
++ }
++
++ QChar ch = str.at(index);
++ int num = 1;
++ if (ch.unicode() >= 0xd800 && ch.unicode() <= 0xdbff && index + 1 != len) {
++ ch = str.at(index + 1);
++ if (ch.unicode() >= 0xdc00 && ch.unicode() <= 0xdfff)
++ num = 2;
++ }
++
++ thisObject->d()->nextIndex += num;
++
++ ScopedString resultString(scope, scope.engine->newString(s->toQString().mid(index, num)));
++ return IteratorPrototype::createIterResultObject(scope.engine, resultString, false);
++ }
++