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
29 namespace WebCore {
30
31 using namespace JSC;
32
33 ASSERT_CLASS_FITS_IN_CELL(JSNodeFilterCondition);
34
JSNodeFilterCondition(JSGlobalData & globalData,NodeFilter * owner,JSValue filter)35 JSNodeFilterCondition::JSNodeFilterCondition(JSGlobalData& globalData, NodeFilter* owner, JSValue filter)
36 : m_filter(globalData, filter, &m_weakOwner, owner)
37 {
38 }
39
acceptNode(JSC::ExecState * exec,Node * filterNode) const40 short 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
isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>,void * context,SlotVisitor & visitor)86 bool JSNodeFilterCondition::WeakOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, SlotVisitor& visitor)
87 {
88 return visitor.containsOpaqueRoot(context);
89 }
90
91 } // namespace WebCore
92