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xpath_expression.h

//  -*- c++ -*-

#ifndef XPATH_EXPRESSION_H
#define XPATH_EXPRESSION_H

#include <qvaluelist.h>
#include <dom/dom_node.h>

#include <xpath/xpath_value.h>

namespace XPath {

class QueryState;

class LocationPath : public XPathNode
{
public:
    enum LocationPathType {
        Relative, Absolute, AbbrevRelative, AbbrevAbsolute
    };

private:
    LocationPathType ptype;
};

class VariableRef : public XPathNode
{
public:
};

class BinaryOp : public XPathNode
{
public:
    enum BinaryOpType {
        NullBinaryOp,
        Or, And, Equality,
        LessThan, GreaterThan, LessThanEqual, GreaterThanEqual,
        Plus, Minus, Mul, Div, Mod,
        Union
    };

    BinaryOp();
    BinaryOp( const BinaryOp &node );
    BinaryOp( ushort bop );
    virtual ~BinaryOp();

    virtual Value *evaluate( QueryState *state );

    virtual QString name() const;
    virtual QString qstring() const;

private:
    ushort op;
    XPathNode lexpr;
    XPathNode rexpr;
};

class UnaryOp : public XPathNode
{
public:
    enum UnaryOpType {
        UnaryMinus
    };

private:
    UnaryOpType optype;
    XPathNode expr;
};

class NodeTest : public XPathNode
{
public:
    enum NodeTestId {
        AnyName, NCName, QName,
        CommentNode, TextNode, ProcessInstructNode, NodeNode
    };

private:
    ushort id;
};

class FunctionCall : public XPathNode
{
public:
    enum Functions {
        FunctionNull,

        // node-set functions
        FunctionLast, FunctionPosition, FunctionCount,
        FunctionId, FunctionLocalName, FunctionNamespaceURI, FunctionName,

        // string functions
        FunctionString, FunctionConcat, FunctionStartsWith, FunctionContains,
        FunctionSubStringBefore, FunctionSubStringAfter, FunctionSubString,
        FunctionStringLength, FunctionNormalizeSpace, FunctionTranslate,

        // boolean functions
        FunctionBoolean, FunctionNot, FunctionTrue, FunctionFalse, FunctionLang,

        // number functions
        FunctionNumber, FunctionSum, FunctionFloor, FunctionCeiling, FunctionRound,

        // Reserves space for XPath. (XSLT needs to add new funcs).
        FunctionLastReserved = 256
    };

    FunctionCall();
    FunctionCall( const FunctionCall &node );
    FunctionCall( ushort fid );
    virtual ~FunctionCall();

    virtual Value *evaluate( QueryState *state );

    virtual QString name() const;
    virtual QString qstring() const;

private:
    ushort id;
    QValueList<XPathNode> args;
};

class Axis : public XPathNode
{
public:
    enum Id {
        NullAxis,
        Child, Descendent, Parent, Ancestor,
        FollowingSibling, PrecedingSibling,
        Following, Preceding,
        Attribute, Namespace,
        Self, DescendentOrSelf, AncestorOrSelf
    };

    Axis();
    Axis( const Axis &node );
    Axis( ushort fid );
    virtual ~Axis();

    virtual Value *evaluate( QueryState *state );

    virtual QString name() const;
    virtual QString qstring() const;

private:
    ushort id;
};

}; // namespace XPath

#endif // XPATH_EXPRESSION_H

// Local Variables:
// c-basic-offset: 4
// End:

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