#ifndef XPathPredicate_h
#define XPathPredicate_h
#include "XPathExpressionNode.h"
#include "XPathValue.h"
namespace WebCore {
namespace XPath {
class Number : public Expression {
public:
explicit Number(double);
private:
virtual Value evaluate() const;
virtual Value::Type resultType() const { return Value::NumberValue; }
Value m_value;
};
class StringExpression : public Expression {
public:
explicit 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 {
WTF_MAKE_NONCOPYABLE(Predicate); WTF_MAKE_FAST_ALLOCATED;
public:
explicit 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 // XPathPredicate_h