filter_validator.h

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#ifndef FILTER_VALIDATOR_H
#define FILTER_VALIDATOR_H
 
#include <QValidator>
#include <QString>

class FilterValidator : public QValidator
{
    Q_OBJECT
 
public:
    struct Detail {
        int     errPos = -1;     
        int     errLen = 0;      
        QString errMsg;          
        QString deprecatedToken; 
    };
 
    explicit FilterValidator(QObject *parent = nullptr);

    QValidator::State validate(QString &input, int &pos) const override = 0;

    virtual Detail lastDetail() const = 0;

    QString lastError() const { return lastDetail().errMsg; }

    QString lastErrorFull(const QString &filter) const;

    QString deprecatedToken() const { return lastDetail().deprecatedToken; }

    static QString createSyntaxErrorMessageFull(const QString &filter,
                                                const QString &err_msg,
                                                qsizetype loc_start,
                                                size_t loc_length);
};
 
#endif // FILTER_VALIDATOR_H