/daten/ahuesgen/projects/vhist/code/vhistlib/include/vhistfindlib/expressionvalue.h

/* $HEADERS
 $Id: expressionvalue.h 2168 2011-05-30 09:09:54Z ahuesgen $
 */

#ifndef EXPRESSIONVALUE_H
#define EXPRESSIONVALUE_H

#include "../shared/misc_defines.h"

#include <QString>
#include <QtDebug>

namespace vhist
{

struct Variable
{
    QString name;
    QString attribute;
};


struct Operator
{
    QString operatorValue;
    int precedence;
    char association; // 'l' for left, 'r' for right
    int numArguments;
};


enum ValueType
{
    VALUE_TYPE_VARIABLE = 1,
    VALUE_TYPE_STRING = 2,
    VALUE_TYPE_OPERATOR = 4
};


class ExpressionValue
{
public:
    ExpressionValue();
    
public:
    bool isVariable() const;
    bool isString() const;
    bool isOperator() const;

public:
    QString originalText() const;
    int position() const;
    int length() const;

    QString string() const;

    QString operatorName() const;
    int precedence() const;
    void setPrecedence(int newPrecedence);
    int numArgs() const;
    char association() const;

    QString variableName() const;
    QString variableAttribute() const;

public:
    void setVariableName(const QString& name);

    

private:
    ValueType m_type;
    Variable m_var;
    QString m_string;
    Operator m_operator;
    QString m_originalText;
    int m_pos;
    
public:
    static ExpressionValue fromString(const QString& string, int pos = -1,
            const QString& originalText = "");
    static ExpressionValue fromVariable(const QString& variableName,
            const QString attribute, int pos = -1,
            const QString& originalText = "");
    static ExpressionValue fromVariable(const QString& variable,
            int pos = -1, const QString& originalText = "");
    static ExpressionValue fromOperator(const QString& string,
            int pos = -1, const QString& originalText = "");
};

}

QDebug operator<<(QDebug dbg, const vhist::ExpressionValue &v);

#endif // EXPRESSIONVALUE_H