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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
#if ENABLE(XPATH)
#include "XPathExpressionNode.h"
#include "XPathValue.h"
namespace WebCore {
namespace XPath {
class Number : public Expression {
public:
Number(double);
private:
virtual Value evaluate() const;
virtual Value::Type resultType() const { return Value::NumberValue; }
Value m_value;
};
class StringExpression : public Expression {
public:
StringExpression(const String&);
private:
virtual Value evaluate() const;
virtual Value::Type resultType() const { return Value::StringValue; }
Value m_value;
};
class Negative : public Expression {
private:
virtual Value evaluate() const;
virtual Value::Type resultType() const { return Value::NumberValue; }
};
class NumericOp : public Expression {
public:
enum Opcode {
OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod
};
NumericOp(Opcode, Expression* lhs, Expression* rhs);
private:
virtual Value evaluate() const;
virtual Value::Type resultType() const { return Value::NumberValue; }
Opcode m_opcode;
};
class EqTestOp : public Expression {
public:
enum Opcode { OP_EQ, OP_NE, OP_GT, OP_LT, OP_GE, OP_LE };
EqTestOp(Opcode, Expression* lhs, Expression* rhs);
virtual Value evaluate() const;
private:
virtual Value::Type resultType() const { return Value::BooleanValue; }
bool compare(const Value&, const Value&) const;
Opcode m_opcode;
};
class LogicalOp : public Expression {
public:
enum Opcode { OP_And, OP_Or };
LogicalOp(Opcode, Expression* lhs, Expression* rhs);
private:
virtual Value::Type resultType() const { return Value::BooleanValue; }
bool shortCircuitOn() const;
virtual Value evaluate() const;
Opcode m_opcode;
};
class Union : public Expression {
private:
virtual Value evaluate() const;
virtual Value::Type resultType() const { return Value::NodeSetValue; }
};
class Predicate : public Noncopyable {
public:
Predicate(Expression*);
~Predicate();
bool evaluate() const;
bool isContextPositionSensitive() const { return m_expr->isContextPositionSensitive() || m_expr->resultType() == Value::NumberValue; }
bool isContextSizeSensitive() const { return m_expr->isContextSizeSensitive(); }
private:
Expression* m_expr;
};
}
}
#endif // ENABLE(XPATH)
#endif // XPathPredicate_h
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