File indexing completed on 2024-05-19 16:47:31

0001 // clang-format off
0002 /*
0003  * KDiff3 - Text Diff And Merge Tool
0004  *
0005  * SPDX-FileCopyrightText: 2002-2011 Joachim Eibl, joachim.eibl at gmx.de
0006  * SPDX-FileCopyrightText: 2018-2020 Michael Reeves reeves.87@gmail.com
0007  * SPDX-License-Identifier: GPL-2.0-or-later
0008  */
0009 // clang-format on
0010 #ifndef SELECTION_H
0011 #define SELECTION_H
0012 
0013 #include "LineRef.h"
0014 
0015 #include <algorithm> // for max, min
0016 #include <QtGlobal>
0017 
0018 class Selection
0019 {
0020   public:
0021     Selection() = default;
0022 
0023   private:
0024     LineRef firstLine;
0025     LineRef lastLine;
0026 
0027     QtSizeType firstPos = -1;
0028     QtSizeType lastPos = -1;
0029 
0030     LineRef oldFirstLine;
0031     LineRef oldLastLine;
0032 
0033   public:
0034     [[nodiscard]] inline LineRef getFirstLine() const { return firstLine; };
0035     [[nodiscard]] inline LineRef getLastLine() const { return lastLine; };
0036 
0037     [[nodiscard]] inline QtSizeType getFirstPos() const { return firstPos; };
0038     [[nodiscard]] inline QtSizeType getLastPos() const { return lastPos; };
0039 
0040     [[nodiscard]] inline bool isValidFirstLine() const { return firstLine.isValid(); }
0041     inline void clearOldSelection() { oldLastLine.invalidate(), oldFirstLine.invalidate(); };
0042 
0043     [[nodiscard]] inline LineRef getOldLastLine() const { return oldLastLine; };
0044     [[nodiscard]] inline LineRef getOldFirstLine() const { return oldFirstLine; };
0045     [[nodiscard]] inline bool isEmpty() const { return !firstLine.isValid() || (firstLine == lastLine && firstPos == lastPos); }
0046 
0047     void reset()
0048     {
0049         oldLastLine = lastLine;
0050         oldFirstLine = firstLine;
0051         firstLine.invalidate();
0052         lastLine.invalidate();
0053     }
0054 
0055     void start(LineRef l, QtSizeType p)
0056     {
0057         firstLine = l;
0058         firstPos = p;
0059     }
0060 
0061     void end(LineRef l, QtSizeType p)
0062     {
0063         if(!oldLastLine.isValid())
0064             oldLastLine = lastLine;
0065         lastLine = l;
0066         lastPos = p;
0067     }
0068 
0069     [[nodiscard]] bool within(LineRef l, QtSizeType p) const;
0070     [[nodiscard]] bool lineWithin(LineRef l) const;
0071 
0072     [[nodiscard]] QtSizeType firstPosInLine(LineRef l) const;
0073     [[nodiscard]] QtSizeType lastPosInLine(LineRef l) const;
0074 
0075     [[nodiscard]] LineRef beginLine() const
0076     {
0077         if(!firstLine.isValid() && !lastLine.isValid()) return LineRef();
0078         return std::max((LineRef)0, std::min(firstLine, lastLine));
0079     }
0080 
0081     [[nodiscard]] LineRef endLine() const
0082     {
0083         if(!firstLine.isValid() && !lastLine.isValid()) return LineRef();
0084         return std::max(firstLine, lastLine);
0085     }
0086 
0087     [[nodiscard]] QtSizeType beginPos() const { return firstLine == lastLine ? std::min(firstPos, lastPos) :
0088                                                        firstLine < lastLine  ? (!firstLine.isValid() ? 0 : firstPos) :
0089                                                                                (!lastLine.isValid() ? 0 : lastPos); }
0090     [[nodiscard]] QtSizeType endPos() const { return firstLine == lastLine ? std::max(firstPos, lastPos) :
0091                                                      firstLine < lastLine  ? lastPos :
0092                                                                              firstPos; }
0093 };
0094 
0095 #endif