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/JSLock.h>
27
28 namespace WebCore {
29
30 using namespace JSC;
31
32 ASSERT_CLASS_FITS_IN_CELL(JSNodeFilterCondition);
33
JSNodeFilterCondition(JSValue filter)34 JSNodeFilterCondition::JSNodeFilterCondition(JSValue filter)
35 : m_filter(filter)
36 {
37 }
38
markAggregate(MarkStack & markStack)39 void JSNodeFilterCondition::markAggregate(MarkStack& markStack)
40 {
41 markStack.append(m_filter);
42 }
43
acceptNode(JSC::ExecState * exec,Node * filterNode) const44 short JSNodeFilterCondition::acceptNode(JSC::ExecState* exec, Node* filterNode) const
45 {
46 JSLock lock(SilenceAssertionsOnly);
47
48 CallData callData;
49 CallType callType = m_filter.getCallData(callData);
50 if (callType == CallTypeNone)
51 return NodeFilter::FILTER_ACCEPT;
52
53 // The exec argument here should only be null if this was called from a
54 // non-JavaScript language, and this is a JavaScript filter, and the document
55 // in question is not associated with the frame. In that case, we're going to
56 // behave incorrectly, and just reject nodes instead of calling the filter function.
57 // To fix that we'd need to come up with a way to find a suitable JavaScript
58 // execution context for the filter function to run in.
59 if (!exec)
60 return NodeFilter::FILTER_REJECT;
61
62 MarkedArgumentBuffer args;
63 // FIXME: The node should have the prototype chain that came from its document, not
64 // whatever prototype chain might be on the window this filter came from. Bug 27662
65 args.append(toJS(exec, deprecatedGlobalObjectForPrototype(exec), filterNode));
66 if (exec->hadException())
67 return NodeFilter::FILTER_REJECT;
68
69 JSValue result = call(exec, m_filter, callType, callData, m_filter, args);
70 if (exec->hadException())
71 return NodeFilter::FILTER_REJECT;
72
73 int intResult = result.toInt32(exec);
74 if (exec->hadException())
75 return NodeFilter::FILTER_REJECT;
76
77 return intResult;
78 }
79
80 } // namespace WebCore
81