queryparser.h

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#ifndef OPENSWMMVIS_QUERYPARSER_H
#define OPENSWMMVIS_QUERYPARSER_H
 
#include <QList>
#include <QRegularExpression>
#include <QString>
#include <QStringList>
#include <QVariant>
#include <QVariantMap>
 
#include <memory>
 
namespace openswmmvis {
 
struct QueryNode {
    enum Kind {
        OrOp,
        AndOp,
        NotOp,
        Compare,
        Like,
        In,
    };
    Kind                       kind = Compare;
    std::shared_ptr<QueryNode> left;
    std::shared_ptr<QueryNode> right;
    QString                    fieldName;
    QString                    op;         
    QVariant                   literal;    
    QList<QVariant>            inList;     
    QRegularExpression         likeRegex;
};
 
struct QueryPredicate {
    std::shared_ptr<QueryNode> root;
    QString                    error;
    int                        errorPos = -1;
    [[nodiscard]] bool         isValid() const noexcept { return !!root && error.isEmpty(); }
};
 
QueryPredicate parseQuery(const QString &whereClause);
 
QStringList queryFieldNames(const QueryPredicate &pred);
 
bool evaluateQuery(const QueryPredicate &pred, const QVariantMap &row);
 
} // namespace openswmmvis
 
#endif // OPENSWMMVIS_QUERYPARSER_H