/*

 * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 * 2.  Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "config.h"

#include "JSPropertyNameIterator.h"

#include "JSGlobalObject.h"

namespace JSC {

ASSERT_CLASS_FITS_IN_CELL(JSPropertyNameIterator);

inline JSPropertyNameIterator::JSPropertyNameIterator(ExecState* exec, PropertyNameArrayData* propertyNameArrayData, size_t numCacheableSlots)

    : JSCell(exec->globalData().propertyNameIteratorStructure.get())

    , m_cachedStructure(0)

    , m_numCacheableSlots(numCacheableSlots)

    , m_jsStringsSize(propertyNameArrayData->propertyNameVector().size())

    , m_jsStrings(new JSValue[m_jsStringsSize])

{

    PropertyNameArrayData::PropertyNameVector& propertyNameVector = propertyNameArrayData->propertyNameVector();

    for (size_t i = 0; i < m_jsStringsSize; ++i)

        m_jsStrings[i] = jsOwnedString(exec, propertyNameVector[i].ustring());

}

JSPropertyNameIterator::~JSPropertyNameIterator()

{

    if (m_cachedStructure)

        m_cachedStructure->clearEnumerationCache(this);

}

JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSObject* o)

{

    ASSERT(!o->structure()->enumerationCache() ||

            o->structure()->enumerationCache()->cachedStructure() != o->structure() ||

            o->structure()->enumerationCache()->cachedPrototypeChain() != o->structure()->prototypeChain(exec));

    PropertyNameArray propertyNames(exec);

    o->getPropertyNames(exec, propertyNames);

    size_t numCacheableSlots = 0;

    if (!o->structure()->hasNonEnumerableProperties() && !o->structure()->hasAnonymousSlots() &&

        !o->structure()->hasGetterSetterProperties() && !o->structure()->isUncacheableDictionary() &&

        !o->structure()->typeInfo().overridesGetPropertyNames())

        numCacheableSlots = o->structure()->propertyStorageSize();

    JSPropertyNameIterator* jsPropertyNameIterator = new (exec) JSPropertyNameIterator(exec, propertyNames.data(), numCacheableSlots);

    if (o->structure()->isDictionary())

        return jsPropertyNameIterator;

    if (o->structure()->typeInfo().overridesGetPropertyNames())

        return jsPropertyNameIterator;

    size_t count = normalizePrototypeChain(exec, o);

    StructureChain* structureChain = o->structure()->prototypeChain(exec);

    RefPtr<Structure>* structure = structureChain->head();

    for (size_t i = 0; i < count; ++i) {

        if (structure[i]->typeInfo().overridesGetPropertyNames())

            return jsPropertyNameIterator;

    }

    jsPropertyNameIterator->setCachedPrototypeChain(structureChain);

    jsPropertyNameIterator->setCachedStructure(o->structure());

    o->structure()->setEnumerationCache(jsPropertyNameIterator);

    return jsPropertyNameIterator;

}

JSValue JSPropertyNameIterator::get(ExecState* exec, JSObject* base, size_t i)

{

    JSValue& identifier = m_jsStrings[i];

    if (m_cachedStructure == base->structure() && m_cachedPrototypeChain == base->structure()->prototypeChain(exec))

        return identifier;

    if (!base->hasProperty(exec, Identifier(exec, asString(identifier)->value(exec))))

        return JSValue();

    return identifier;

}

void JSPropertyNameIterator::markChildren(MarkStack& markStack)

{

    markStack.appendValues(m_jsStrings.get(), m_jsStringsSize, MayContainNullValues);

}

} // namespace JSC