1 /* 2 * Copyright (C) 2001 Peter Kelly (pmk (at) 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 35 JSNodeFilterCondition::JSNodeFilterCondition(JSGlobalData& globalData, NodeFilter* owner, JSValue filter) 36 : m_filter(globalData, filter, &m_weakOwner, owner) 37 { 38 } 39 40 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 86 bool JSNodeFilterCondition::WeakOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, MarkStack& markStack) 87 { 88 return markStack.containsOpaqueRoot(context); 89 } 90 91 } // namespace WebCore 92
