Source/WebCore/bindings/js/JSHTMLCollectionCustom.cpp

/*
 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"
#include "JSHTMLCollection.h"

#include "HTMLCollection.h"
#include "HTMLOptionsCollection.h"
#include "HTMLAllCollection.h"
#include "JSDOMBinding.h"
#include "JSHTMLAllCollection.h"
#include "JSHTMLOptionsCollection.h"
#include "JSNode.h"
#include "JSNodeList.h"
#include "Node.h"
#include "StaticNodeList.h"
#include <wtf/Vector.h>
#include <wtf/text/AtomicString.h>

using namespace JSC;

namespace WebCore {

static JSValue getNamedItems(ExecState* exec, JSHTMLCollection* collection, const Identifier& propertyName)
{
    Vector<RefPtr<Node> > namedItems;
    collection->impl()->namedItems(identifierToAtomicString(propertyName), namedItems);

    if (namedItems.isEmpty())
        return jsUndefined();
    if (namedItems.size() == 1)
        return toJS(exec, collection->globalObject(), namedItems[0].get());

    // FIXME: HTML5 specifies that this should be a DynamicNodeList.
    // FIXME: HTML5 specifies that non-HTMLOptionsCollection collections should return
    // the first matching item instead of a NodeList.
    return toJS(exec, collection->globalObject(), StaticNodeList::adopt(namedItems).get());
}

// HTMLCollections are strange objects, they support both get and call,
// so that document.forms.item(0) and document.forms(0) both work.
static EncodedJSValue JSC_HOST_CALL callHTMLCollection(ExecState* exec)
{
    if (exec->argumentCount() < 1)
        return JSValue::encode(jsUndefined());

    // Do not use thisObj here. It can be the JSHTMLDocument, in the document.forms(i) case.
    JSHTMLCollection* jsCollection = static_cast<JSHTMLCollection*>(exec->callee());
    HTMLCollection* collection = jsCollection->impl();

    // Also, do we need the TypeError test here ?

    if (exec->argumentCount() == 1) {
        // Support for document.all(<index>) etc.
        bool ok;
        UString string = exec->argument(0).toString(exec);
        unsigned index = Identifier::toUInt32(string, ok);
        if (ok)
            return JSValue::encode(toJS(exec, jsCollection->globalObject(), collection->item(index)));

        // Support for document.images('<name>') etc.
        return JSValue::encode(getNamedItems(exec, jsCollection, Identifier(exec, string)));
    }

    // The second arg, if set, is the index of the item we want
    bool ok;
    UString string = exec->argument(0).toString(exec);
    unsigned index = Identifier::toUInt32(exec->argument(1).toString(exec), ok);
    if (ok) {
        String pstr = ustringToString(string);
        Node* node = collection->namedItem(pstr);
        while (node) {
            if (!index)
                return JSValue::encode(toJS(exec, jsCollection->globalObject(), node));
            node = collection->nextNamedItem(pstr);
            --index;
        }
    }

    return JSValue::encode(jsUndefined());
}

CallType JSHTMLCollection::getCallData(CallData& callData)
{
    callData.native.function = callHTMLCollection;
    return CallTypeHost;
}

bool JSHTMLCollection::canGetItemsForName(ExecState*, HTMLCollection* collection, const Identifier& propertyName)
{
    Vector<RefPtr<Node> > namedItems;
    collection->namedItems(identifierToAtomicString(propertyName), namedItems);
    return !namedItems.isEmpty();
}

JSValue JSHTMLCollection::nameGetter(ExecState* exec, JSValue slotBase, const Identifier& propertyName)
{
    JSHTMLCollection* thisObj = static_cast<JSHTMLCollection*>(asObject(slotBase));
    return getNamedItems(exec, thisObj, propertyName);
}

JSValue JSHTMLCollection::item(ExecState* exec)
{
    bool ok;
    uint32_t index = Identifier::toUInt32(exec->argument(0).toString(exec), ok);
    if (ok)
        return toJS(exec, globalObject(), impl()->item(index));
    return getNamedItems(exec, this, Identifier(exec, exec->argument(0).toString(exec)));
}

JSValue JSHTMLCollection::namedItem(ExecState* exec)
{
    return getNamedItems(exec, this, Identifier(exec, exec->argument(0).toString(exec)));
}

JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, HTMLCollection* collection)
{
    if (!collection)
        return jsNull();

    JSDOMWrapper* wrapper = getCachedWrapper(currentWorld(exec), collection);

    if (wrapper)
        return wrapper;

    switch (collection->type()) {
        case SelectOptions:
            wrapper = CREATE_DOM_OBJECT_WRAPPER(exec, globalObject, HTMLOptionsCollection, collection);
            break;
        case DocAll:
            wrapper = CREATE_DOM_OBJECT_WRAPPER(exec, globalObject, HTMLAllCollection, collection);
            break;
        default:
            wrapper = CREATE_DOM_OBJECT_WRAPPER(exec, globalObject, HTMLCollection, collection);
            break;
    }

    return wrapper;
}

} // namespace WebCore