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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.
*/
#pragma once
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
#include <wtf/text/AtomString.h>
namespace WebCore {
class Node;
namespace XPath {
class Expression;
class NodeSet;
class Step {
WTF_MAKE_TZONE_ALLOCATED(Step);
public:
enum Axis {
AncestorAxis, AncestorOrSelfAxis, AttributeAxis,
ChildAxis, DescendantAxis, DescendantOrSelfAxis,
FollowingAxis, FollowingSiblingAxis, NamespaceAxis,
ParentAxis, PrecedingAxis, PrecedingSiblingAxis,
SelfAxis
};
class NodeTest {
WTF_MAKE_TZONE_ALLOCATED(NodeTest);
public:
enum Kind { TextNodeTest, CommentNodeTest, ProcessingInstructionNodeTest, AnyNodeTest, NameTest };
explicit NodeTest(Kind kind) : m_kind(kind) { }
NodeTest(Kind kind, const AtomString& data) : m_kind(kind), m_data(data) { }
NodeTest(Kind kind, const AtomString& data, const AtomString& namespaceURI) : m_kind(kind), m_data(data), m_namespaceURI(namespaceURI) { }
private:
friend class Step;
friend void optimizeStepPair(Step&, Step&, bool&);
friend bool nodeMatchesBasicTest(Node&, Axis, const NodeTest&);
friend bool nodeMatches(Node&, Axis, const NodeTest&);
Kind m_kind;
AtomString m_data;
AtomString m_namespaceURI;
Vector<std::unique_ptr<Expression>> m_mergedPredicates;
};
Step(Axis, NodeTest);
Step(Axis, NodeTest, Vector<std::unique_ptr<Expression>>);
~Step();
void optimize();
void evaluate(Node& context, NodeSet&) const;
Axis axis() const { return m_axis; }
private:
friend void optimizeStepPair(Step&, Step&, bool&);
bool predicatesAreContextListInsensitive() const;
void parseNodeTest(const String&);
void nodesInAxis(Node& context, NodeSet&) const;
Axis m_axis;
NodeTest m_nodeTest;
Vector<std::unique_ptr<Expression>> m_predicates;
};
void optimizeStepPair(Step&, Step&, bool& dropSecondStep);
} // namespace XPath
} // namespace WebCore
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