/****************************************************************************
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** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
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** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
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** included in the packaging of this file. Please review the following
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QBS_CHANGESET_H
#define QBS_CHANGESET_H

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

namespace QbsQmlJS {

class ChangeSet
{
public:
    struct EditOp {
        enum Type
        {
            Unset,
            Replace,
            Move,
            Insert,
            Remove,
            Flip,
            Copy
        };

        EditOp(): type(Unset), pos1(0), pos2(0), length1(0), length2(0) {}
        EditOp(Type t): type(t), pos1(0), pos2(0), length1(0), length2(0) {}

        Type type;
        int pos1;
        int pos2;
        int length1;
        int length2;
        QString text;
    };

    struct Range {
        Range()
            : start(0), end(0) {}

        Range(int start, int end)
            : start(start), end(end) {}

        int start;
        int end;
    };

public:
    ChangeSet();
    ChangeSet(QList<EditOp> operations);

    bool empty() const;

    QList<EditOp> operationList() const;

    void clear();

    bool replace(const Range &range, const QString &replacement);
    bool remove(const Range &range);
    bool move(const Range &range, int to);
    bool flip(const Range &range1, const Range &range2);
    bool copy(const Range &range, int to);
    bool replace(int start, int end, const QString &replacement);
    bool remove(int start, int end);
    bool move(int start, int end, int to);
    bool flip(int start1, int end1, int start2, int end2);
    bool copy(int start, int end, int to);
    bool insert(int pos, const QString &text);

    bool hadErrors();

    void apply(QString *s);

private:
    // length-based API.
    bool replace_helper(int pos, int length, const QString &replacement);
    bool move_helper(int pos, int length, int to);
    bool remove_helper(int pos, int length);
    bool flip_helper(int pos1, int length1, int pos2, int length2);
    bool copy_helper(int pos, int length, int to);

    bool hasOverlap(int pos, int length);
    QString textAt(int pos, int length);

    void doReplace(const EditOp &replace, QList<EditOp> *replaceList);
    void convertToReplace(const EditOp &op, QList<EditOp> *replaceList);

    void apply_helper();

private:
    QString *m_string;

    QList<EditOp> m_operationList;
    bool m_error;
};

} // namespace QbsQmlJS

#endif // Include guard.
