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****************************************************************************/

#ifndef CHANGESET_H
#define CHANGESET_H

#include "utils_global.h"

#include <QtCore/QString>
#include <QtCore/QList>
#include <QtCore/QSharedPointer>
#include <QtGui/QTextCursor>

namespace Utils {

class QTCREATOR_UTILS_EXPORT 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;
    };

public:
    ChangeSet();

    bool isEmpty() const;

    QList<EditOp> operationList() const;

    void clear();

    bool replace(int pos, int length, const QString &replacement);
    bool move(int pos, int length, int to);
    bool insert(int pos, const QString &text);
    bool remove(int pos, int length);
    bool flip(int pos1, int length1, int pos2, int length2);
    bool copy(int pos, int length, int to);

    bool hadErrors();

    void apply(QString *s);
    void apply(QTextCursor *textCursor);

private:
    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;
    QTextCursor *m_cursor;

    QList<EditOp> m_operationList;
    bool m_error;
};

} // namespace Utils

#endif // CHANGESET_H