File indexing completed on 2024-11-24 05:00:12

 /*
     SPDX-FileCopyrightText: 2014 Ivan Cukic <ivan.cukic@kde.org>
 
     SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 */
 
 #ifndef COMMON_DATABASE_H
 #define COMMON_DATABASE_H
 
 #include <QRegularExpression>
 #include <QSqlQuery>
 #include <memory>
 
 namespace Common
 {
 class Database
 {
 public:
     typedef std::shared_ptr<Database> Ptr;
 
     enum Source {
         ResourcesDatabase,
     };
 
     enum OpenMode {
         ReadWrite,
         ReadOnly,
     };
 
     static Ptr instance(Source source, OpenMode openMode);
 
     QSqlQuery execQueries(const QStringList &queries) const;
     QSqlQuery execQuery(const QString &query) const;
     QSqlQuery createQuery() const;
 
     void setPragma(const QString &pragma);
     QVariant pragma(const QString &pragma) const;
     QVariant value(const QString &query) const;
 
     ~Database();
     Database();
 
     friend class Locker;
     class Locker
     {
     public:
         Locker(Database &database);
         ~Locker();
 
     private:
         QSqlDatabase &m_database;
     };
 
 #define DATABASE_TRANSACTION(A)                                                                                                                                \
     /* enable this for debugging only: qDebug() << "Location:" << __FILE__ << __LINE__; */                                                                     \
     Common::Database::Locker lock(A)
 
 private:
     class Private;
     std::unique_ptr<Private> d;
 };
 
 template<typename EscapeFunction>
 QString parseStarPattern(const QString &pattern, const QString &joker, EscapeFunction escape)
 {
     const auto begin = pattern.constBegin();
     const auto end = pattern.constEnd();
 
     auto currentStart = pattern.constBegin();
     auto currentPosition = pattern.constBegin();
 
     bool isEscaped = false;
 
     // This should be available in the QString class...
     auto stringFromIterators = [&](const QString::const_iterator &currentStart, const QString::const_iterator &currentPosition) {
         return pattern.mid(std::distance(begin, currentStart), std::distance(currentStart, currentPosition));
     };
 
     // Escaping % and _ for sql like
     // auto escape = [] (QString str) {
     //     return str.replace("%", "\\%").replace("_", "\\_");
     // };
 
     QString resultPattern;
     resultPattern.reserve(pattern.size() * 1.5);
 
     for (; currentPosition != end; ++currentPosition) {
         if (isEscaped) {
             // Just skip the current character
             isEscaped = false;
 
         } else if (*currentPosition == QLatin1Char('\\')) {
             // Skip two characters
             isEscaped = true;
 
         } else if (*currentPosition == QLatin1Char('*')) {
             // Replacing the star with the sql like joker - %
             resultPattern.append(escape(stringFromIterators(currentStart, currentPosition)) + joker);
             currentStart = currentPosition + 1;
 
         } else {
             // This one is boring, nothing to do
         }
     }
 
     if (currentStart != currentPosition) {
         resultPattern.append(escape(stringFromIterators(currentStart, currentPosition)));
     }
 
     return resultPattern;
 }
 
 inline QString escapeSqliteLikePattern(QString pattern)
 {
     return pattern.replace(QLatin1String("%"), QLatin1String("\\%"))
         .replace(QLatin1String("_"), QLatin1String("\\_"))
         .replace(QLatin1String("'"), QLatin1String("\\'"));
 }
 
 inline QString starPatternToLike(const QString &pattern)
 {
     return parseStarPattern(pattern, QStringLiteral("%"), escapeSqliteLikePattern);
 }
 
 inline QRegularExpression starPatternToRegex(const QString &pattern)
 {
     const QString parsed = parseStarPattern(pattern, QStringLiteral(".*"), QOverload<const QString &>::of(&QRegularExpression::escape));
     return QRegularExpression(QRegularExpression::anchoredPattern(parsed));
 }
 
 } // namespace Common
 
 #endif // COMMON_DATABASE_H