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0001 /*
0002  *  SPDX-FileCopyrightText: 2020  Andreas Cord-Landwehr <cordlandwehr@kde.org>
0003  *
0004  *  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
0005  */
0006 
0007 #ifndef SKIPPARSER_H
0008 #define SKIPPARSER_H
0009 
0010 #include <QMap>
0011 #include <QObject>
0012 #include <QRegularExpression>
0013 #include <QVector>
0014 #include <optional>
0015 
0016 class SkipParser
0017 {
0018 public:
0019     std::optional<std::pair<int, int>> findMatch(QString text, QString pattern) const;
0020 
0021     /**
0022      * @brief obtiain first matching pattern position
0023      * @param text
0024      * @param pattern
0025      * @return position, if found
0026      */
0027     std::optional<std::pair<int, int>> findMatch(QString text, QVector<QString> pattern) const;
0028 
0029 private:
0030     /**
0031      * @brief computeKmpPrefix
0032      * @param prunedPattern pattern must not contain any skip character, no additional pruning here
0033      * @return
0034      */
0035     std::vector<int> computeKmpPrefix(const QString &prunedPattern) const;
0036 
0037     std::pair<std::vector<QChar>, std::vector<int>> computeTextSkipPrefix(const QString &text) const;
0038 
0039     std::optional<std::pair<int, int>> findMatchKMP(std::vector<QChar> prunedText, std::vector<int> textSkipPrefix, QString pattern) const;
0040     std::optional<std::pair<int, int>> findMatchNaive(QString text, QString pattern) const;
0041     static const QRegularExpression sSkipCharDetection;
0042     mutable QHash<QString, std::vector<int>> mPrefixCache;
0043 };
0044 
0045 #endif