simpleparser.h

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#ifndef SIMPLEPARSER_H
#define SIMPLEPARSER_H

#include <QVariant>

class Parser {
public:
    virtual QVariant operator()(QString expression) const  = 0;
    static const QVariant &invalid();

private:
    static const QVariant Invalid;
};

class SimpleParser : public Parser {
public:
    SimpleParser();
    QVariant operator()(QString expression) const ;

private:
    QVariant evalFactor(const QString &str, int &pos) const;
    QVariant evalTerm(const QString &str, int &pos) const;
    QVariant evalExpression(const QString &str, int &pos) const;
};

#endif // SIMPLEPARSER_H