1/*
2 *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
3 *  Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
4 *
5 *  This library is free software; you can redistribute it and/or
6 *  modify it under the terms of the GNU Lesser General Public
7 *  License as published by the Free Software Foundation; either
8 *  version 2 of the License, or (at your option) any later version.
9 *
10 *  This library is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 *  Lesser General Public License for more details.
14 *
15 *  You should have received a copy of the GNU Lesser General Public
16 *  License along with this library; if not, write to the Free Software
17 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
18 */
19
20#include "config.h"
21#include "JSNodeFilterCondition.h"
22
23#include "JSNode.h"
24#include "JSNodeFilter.h"
25#include "NodeFilter.h"
26#include <runtime/Error.h>
27#include <runtime/JSLock.h>
28
29namespace WebCore {
30
31using namespace JSC;
32
33ASSERT_CLASS_FITS_IN_CELL(JSNodeFilterCondition);
34
35JSNodeFilterCondition::JSNodeFilterCondition(JSGlobalData& globalData, NodeFilter* owner, JSValue filter)
36    : m_filter(globalData, filter, &m_weakOwner, owner)
37{
38}
39
40short JSNodeFilterCondition::acceptNode(JSC::ExecState* exec, Node* filterNode) const
41{
42    JSLock lock(SilenceAssertionsOnly);
43
44    if (!m_filter.isObject())
45        return NodeFilter::FILTER_ACCEPT;
46
47   // The exec argument here should only be null if this was called from a
48   // non-JavaScript language, and this is a JavaScript filter, and the document
49   // in question is not associated with the frame. In that case, we're going to
50   // behave incorrectly, and just reject nodes instead of calling the filter function.
51   // To fix that we'd need to come up with a way to find a suitable JavaScript
52   // execution context for the filter function to run in.
53    if (!exec)
54        return NodeFilter::FILTER_REJECT;
55
56    JSValue function = m_filter.get();
57    CallData callData;
58    CallType callType = getCallData(function, callData);
59    if (callType == CallTypeNone) {
60        function = m_filter.get().get(exec, Identifier(exec, "acceptNode"));
61        callType = getCallData(function, callData);
62        if (callType == CallTypeNone) {
63            throwError(exec, createTypeError(exec, "NodeFilter object does not have an acceptNode function"));
64            return NodeFilter::FILTER_REJECT;
65        }
66    }
67
68    MarkedArgumentBuffer args;
69    // FIXME: The node should have the prototype chain that came from its document, not
70    // whatever prototype chain might be on the window this filter came from. Bug 27662
71    args.append(toJS(exec, deprecatedGlobalObjectForPrototype(exec), filterNode));
72    if (exec->hadException())
73        return NodeFilter::FILTER_REJECT;
74
75    JSValue result = JSC::call(exec, function, callType, callData, m_filter.get(), args);
76    if (exec->hadException())
77        return NodeFilter::FILTER_REJECT;
78
79    int intResult = result.toInt32(exec);
80    if (exec->hadException())
81        return NodeFilter::FILTER_REJECT;
82
83    return intResult;
84}
85
86bool JSNodeFilterCondition::WeakOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, MarkStack& markStack)
87{
88    return markStack.containsOpaqueRoot(context);
89}
90
91} // namespace WebCore
92