qv4setiterator.cpp

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// Copyright (C) 2018 Crimson AS <info@crimson.no>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include <private/qv4iterator_p.h>
#include <private/qv4estable_p.h>
#include <private/qv4setiterator_p.h>
#include <private/qv4setobject_p.h>
#include <private/qv4symbol_p.h>
 
using namespace QV4;
 
DEFINE_OBJECT_VTABLE(SetIteratorObject);
 
void SetIteratorPrototype::init(ExecutionEngine *e)
{
    defineDefaultProperty(QStringLiteral("next"), method_next, 0);
 
    Scope scope(e);
    ScopedString val(scope, e->newString(QLatin1String("Set Iterator")));
    defineReadonlyConfigurableProperty(e->symbol_toStringTag(), val);
}
 
ReturnedValue SetIteratorPrototype::method_next(const FunctionObject *b, const Value *that, const Value *, int)
{
    Scope scope(b);
    const SetIteratorObject *thisObject = that->as<SetIteratorObject>();
    if (!thisObject)
        return scope.engine->throwTypeError(QLatin1String("Not a Set Iterator instance"));
 
    Scoped<SetObject> s(scope, thisObject->d()->iteratedSet);
    uint index = thisObject->d()->setNextIndex;
    IteratorKind itemKind = thisObject->d()->iterationKind;
 
    if (!s) {
        QV4::Value undefined = Value::undefinedValue();
        return IteratorPrototype::createIterResultObject(scope.engine, undefined, true);
    }
 
    Value *arguments = scope.alloc(2);
 
    while (index < s->d()->esTable->size()) {
        s->d()->esTable->iterate(index, &arguments[0], &arguments[1]);
        thisObject->d()->setNextIndex = index + 1;
 
        if (itemKind == KeyValueIteratorKind) {
            ScopedArrayObject resultArray(scope, scope.engine->newArrayObject());
            resultArray->arrayReserve(2);
            resultArray->arrayPut(0, arguments[0]);
            resultArray->arrayPut(1, arguments[0]); // yes, the key is repeated.
            resultArray->setArrayLengthUnchecked(2);
 
            return IteratorPrototype::createIterResultObject(scope.engine, resultArray, false);
        }
 
        return IteratorPrototype::createIterResultObject(scope.engine, arguments[0], false);
    }
 
    thisObject->d()->iteratedSet.set(scope.engine, nullptr);
    QV4::Value undefined = Value::undefinedValue();
    return IteratorPrototype::createIterResultObject(scope.engine, undefined, true);
}