jsnamednodescollection.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

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 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "JSNamedNodesCollection.h"

#include "AtomicString.h"
#include "Element.h"
#include "JSNode.h"
#include "NamedAttrMap.h"

namespace WebCore {

using namespace JSC;

ASSERT_CLASS_FITS_IN_CELL(JSNamedNodesCollection)

const ClassInfo JSNamedNodesCollection::s_info = { "Collection", 0, 0, 0 };

// Such a collection is usually very short-lived, it only exists
// for constructs like document.forms.<name>[1],
// so it shouldn't be a problem that it's storing all the nodes (with the same name). (David)
JSNamedNodesCollection::JSNamedNodesCollection(ExecState* exec, const Vector<RefPtr<Node> >& nodes)
    : DOMObject(getDOMStructure<JSNamedNodesCollection>(exec))
    , m_nodes(new Vector<RefPtr<Node> >(nodes))
{
}

JSValuePtr JSNamedNodesCollection::lengthGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
{
    JSNamedNodesCollection* thisObj = static_cast<JSNamedNodesCollection*>(asObject(slot.slotBase()));
    return jsNumber(exec, thisObj->m_nodes->size());
}

JSValuePtr JSNamedNodesCollection::indexGetter(ExecState* exec, const Identifier&, const PropertySlot& slot)
{
    JSNamedNodesCollection *thisObj = static_cast<JSNamedNodesCollection*>(asObject(slot.slotBase()));
    return toJS(exec, (*thisObj->m_nodes)[slot.index()].get());
}

bool JSNamedNodesCollection::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
    if (propertyName == exec->propertyNames().length) {
        slot.setCustom(this, lengthGetter);
        return true;
    }

    bool ok;
    unsigned index = propertyName.toUInt32(&ok);
    if (ok && index < m_nodes->size()) {
        slot.setCustomIndex(this, index, indexGetter);
        return true;
    }

    // For IE compatibility, we need to be able to look up elements in a
    // document.formName.name result by id as well as be index.

    AtomicString atomicPropertyName = propertyName;
    for (unsigned i = 0; i < m_nodes->size(); i++) {
        Node* node = (*m_nodes)[i].get();
        if (node->hasAttributes() && node->attributes()->id() == atomicPropertyName) {
            slot.setCustomIndex(this, i, indexGetter);
            return true;
        }
    }

    return DOMObject::getOwnPropertySlot(exec, propertyName, slot);
}

} // namespace WebCore