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/*
* Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006, 2009 Apple Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef XPathStep_h
#define XPathStep_h
#include "XPathExpressionNode.h"
#include "XPathNodeSet.h"
namespace WebCore {
class Node;
namespace XPath {
class Predicate;
class Step : public ParseNode {
WTF_MAKE_NONCOPYABLE(Step);
WTF_MAKE_FAST_ALLOCATED;
public:
enum Axis {
AncestorAxis, AncestorOrSelfAxis, AttributeAxis,
ChildAxis, DescendantAxis, DescendantOrSelfAxis,
FollowingAxis, FollowingSiblingAxis, NamespaceAxis,
ParentAxis, PrecedingAxis, PrecedingSiblingAxis,
SelfAxis
};
class NodeTest {
WTF_MAKE_FAST_ALLOCATED;
public:
enum Kind {
TextNodeTest, CommentNodeTest, ProcessingInstructionNodeTest, AnyNodeTest, NameTest
};
NodeTest(Kind kind) : m_kind(kind) { }
NodeTest(Kind kind, const String& data) : m_kind(kind), m_data(data) { }
NodeTest(Kind kind, const String& data, const String& namespaceURI) : m_kind(kind), m_data(data), m_namespaceURI(namespaceURI) { }
Kind kind() const { return m_kind; }
const AtomicString& data() const { return m_data; }
const AtomicString& namespaceURI() const { return m_namespaceURI; }
Vector<Predicate*>& mergedPredicates() { return m_mergedPredicates; }
const Vector<Predicate*>& mergedPredicates() const { return m_mergedPredicates; }
private:
Kind m_kind;
AtomicString m_data;
AtomicString m_namespaceURI;
// When possible, we merge some or all predicates with node test for better performance.
Vector<Predicate*> m_mergedPredicates;
};
Step(Axis, const NodeTest&, const Vector<Predicate*>& predicates = Vector<Predicate*>());
~Step();
void optimize();
void evaluate(Node* context, NodeSet&) const;
Axis axis() const { return m_axis; }
const NodeTest& nodeTest() const { return m_nodeTest; }
private:
friend void optimizeStepPair(Step*, Step*, bool&);
bool predicatesAreContextListInsensitive() const;
void parseNodeTest(const String&);
void nodesInAxis(Node* context, NodeSet&) const;
String namespaceFromNodetest(const String& nodeTest) const;
Axis m_axis;
NodeTest m_nodeTest;
Vector<Predicate*> m_predicates;
};
void optimizeStepPair(Step*, Step*, bool& dropSecondStep);
} // namespace XPath
} // namespace WebCore
#endif // XPathStep_h
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