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/*
* Copyright 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006 Apple Computer, 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 XPathPredicate_h
#define XPathPredicate_h
#include "core/xml/XPathExpressionNode.h"
#include "core/xml/XPathValue.h"
namespace WebCore {
namespace XPath {
class Number FINAL : public Expression {
public:
explicit Number(double);
virtual void trace(Visitor*) OVERRIDE;
private:
virtual Value evaluate() const OVERRIDE;
virtual Value::Type resultType() const OVERRIDE { return Value::NumberValue; }
Value m_value;
};
class StringExpression FINAL : public Expression {
public:
explicit StringExpression(const String&);
virtual void trace(Visitor*) OVERRIDE;
private:
virtual Value evaluate() const OVERRIDE;
virtual Value::Type resultType() const OVERRIDE { return Value::StringValue; }
Value m_value;
};
class Negative FINAL : public Expression {
private:
virtual Value evaluate() const OVERRIDE;
virtual Value::Type resultType() const OVERRIDE { return Value::NumberValue; }
};
class NumericOp FINAL : public Expression {
public:
enum Opcode {
OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod
};
NumericOp(Opcode, PassOwnPtrWillBeRawPtr<Expression> lhs, PassOwnPtrWillBeRawPtr<Expression> rhs);
private:
virtual Value evaluate() const OVERRIDE;
virtual Value::Type resultType() const OVERRIDE { return Value::NumberValue; }
Opcode m_opcode;
};
class EqTestOp FINAL : public Expression {
public:
enum Opcode { OpcodeEqual, OpcodeNotEqual, OpcodeGreaterThan, OpcodeLessThan, OpcodeGreaterOrEqual, OpcodeLessOrEqual };
EqTestOp(Opcode, PassOwnPtrWillBeRawPtr<Expression> lhs, PassOwnPtrWillBeRawPtr<Expression> rhs);
virtual Value evaluate() const OVERRIDE;
private:
virtual Value::Type resultType() const OVERRIDE { return Value::BooleanValue; }
bool compare(const Value&, const Value&) const;
Opcode m_opcode;
};
class LogicalOp FINAL : public Expression {
public:
enum Opcode { OP_And, OP_Or };
LogicalOp(Opcode, PassOwnPtrWillBeRawPtr<Expression> lhs, PassOwnPtrWillBeRawPtr<Expression> rhs);
private:
virtual Value::Type resultType() const OVERRIDE { return Value::BooleanValue; }
bool shortCircuitOn() const;
virtual Value evaluate() const OVERRIDE;
Opcode m_opcode;
};
class Union FINAL : public Expression {
private:
virtual Value evaluate() const OVERRIDE;
virtual Value::Type resultType() const OVERRIDE { return Value::NodeSetValue; }
};
class Predicate FINAL : public NoBaseWillBeGarbageCollected<Predicate> {
WTF_MAKE_NONCOPYABLE(Predicate); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(Predicate);
public:
explicit Predicate(PassOwnPtrWillBeRawPtr<Expression>);
void trace(Visitor*);
bool evaluate() const;
bool isContextPositionSensitive() const { return m_expr->isContextPositionSensitive() || m_expr->resultType() == Value::NumberValue; }
bool isContextSizeSensitive() const { return m_expr->isContextSizeSensitive(); }
private:
OwnPtrWillBeMember<Expression> m_expr;
};
}
}
#endif // XPathPredicate_h
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