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/*
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* Copyright 2005 Frerich Raabe <raabe@kde.org>
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* Copyright (C) 2006 Apple Computer, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef XPathPredicate_h
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#define XPathPredicate_h
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#if ENABLE(XPATH)
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#include "XPathExpressionNode.h"
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#include "XPathValue.h"
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namespace WebCore {
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namespace XPath {
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class Number : public Expression {
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public:
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Number(double);
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private:
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virtual Value evaluate() const;
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virtual Value::Type resultType() const { return Value::NumberValue; }
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Value m_value;
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};
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class StringExpression : public Expression {
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public:
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StringExpression(const String&);
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private:
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virtual Value evaluate() const;
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virtual Value::Type resultType() const { return Value::StringValue; }
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Value m_value;
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};
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class Negative : public Expression {
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private:
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virtual Value evaluate() const;
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virtual Value::Type resultType() const { return Value::NumberValue; }
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};
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class NumericOp : public Expression {
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public:
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enum Opcode {
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OP_Add, OP_Sub, OP_Mul, OP_Div, OP_Mod
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};
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NumericOp(Opcode, Expression* lhs, Expression* rhs);
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private:
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virtual Value evaluate() const;
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virtual Value::Type resultType() const { return Value::NumberValue; }
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Opcode m_opcode;
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};
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class EqTestOp : public Expression {
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public:
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enum Opcode { OP_EQ, OP_NE, OP_GT, OP_LT, OP_GE, OP_LE };
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EqTestOp(Opcode, Expression* lhs, Expression* rhs);
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virtual Value evaluate() const;
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private:
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virtual Value::Type resultType() const { return Value::BooleanValue; }
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bool compare(const Value&, const Value&) const;
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Opcode m_opcode;
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};
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class LogicalOp : public Expression {
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public:
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enum Opcode { OP_And, OP_Or };
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LogicalOp(Opcode, Expression* lhs, Expression* rhs);
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private:
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virtual Value::Type resultType() const { return Value::BooleanValue; }
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bool shortCircuitOn() const;
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virtual Value evaluate() const;
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Opcode m_opcode;
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};
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class Union : public Expression {
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private:
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virtual Value evaluate() const;
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virtual Value::Type resultType() const { return Value::NodeSetValue; }
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};
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class Predicate : public Noncopyable {
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public:
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Predicate(Expression*);
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~Predicate();
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bool evaluate() const;
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bool isContextPositionSensitive() const { return m_expr->isContextPositionSensitive() || m_expr->resultType() == Value::NumberValue; }
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bool isContextSizeSensitive() const { return m_expr->isContextSizeSensitive(); }
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private:
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Expression* m_expr;
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};
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}
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}
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#endif // ENABLE(XPATH)
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#endif // XPathPredicate_h
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