// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QTEXTBOUNDARYFINDER_H
#define QTEXTBOUNDARYFINDER_H

#include <QtCore/qchar.h>
#include <QtCore/qstring.h>

QT_BEGIN_NAMESPACE


struct QCharAttributes;

class Q_CORE_EXPORT QTextBoundaryFinder
{
public:
    QTextBoundaryFinder();
    QTextBoundaryFinder(const QTextBoundaryFinder &other);
    QTextBoundaryFinder &operator=(const QTextBoundaryFinder &other);
    ~QTextBoundaryFinder();

    enum BoundaryType {
        Grapheme,
        Word,
        Sentence,
        Line
    };

    enum BoundaryReason {
        NotAtBoundary = 0,
        BreakOpportunity = 0x1f,
        StartOfItem = 0x20,
        EndOfItem = 0x40,
        MandatoryBreak = 0x80,
        SoftHyphen = 0x100
    };
    Q_DECLARE_FLAGS( BoundaryReasons, BoundaryReason )

    QTextBoundaryFinder(BoundaryType type, const QString &string);
    QTextBoundaryFinder(BoundaryType type, const QChar *chars, qsizetype length, unsigned char *buffer = nullptr, qsizetype bufferSize = 0)
        : QTextBoundaryFinder(type, QStringView(chars, length), buffer, bufferSize)
    {}
    QTextBoundaryFinder(BoundaryType type, QStringView str, unsigned char *buffer = nullptr, qsizetype bufferSize = 0);

    inline bool isValid() const { return attributes; }

    inline BoundaryType type() const { return t; }
    QString string() const;

    void toStart();
    void toEnd();
    qsizetype position() const;
    void setPosition(qsizetype position);

    qsizetype toNextBoundary();
    qsizetype toPreviousBoundary();

    bool isAtBoundary() const;
    BoundaryReasons boundaryReasons() const;

private:
    BoundaryType t = Grapheme;
    QString s;
    QStringView sv;
    qsizetype pos = 0;
    uint freeBuffer : 1;
    uint unused : 31;
    QCharAttributes *attributes = nullptr;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(QTextBoundaryFinder::BoundaryReasons)

QT_END_NAMESPACE

#endif