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#ifndef BASEANNOTATIONHIGHLIGHTER_H
#define BASEANNOTATIONHIGHLIGHTER_H

#include "vcsbase_global.h"

#include <QtCore/QMap>
#include <QtCore/QSet>
#include <QtGui/QSyntaxHighlighter>
#include <QtGui/QTextCharFormat>

namespace VCSBase {

struct BaseAnnotationHighlighterPrivate;

// Base for a highlighter for annotation lines of the form
// 'changenumber:XXXX'. The change numbers are assigned a color gradient.
// Example:
// 112: text1 <color 1>
// 113: text2 <color 2>
// 112: text3 <color 1>
class VCSBASE_EXPORT BaseAnnotationHighlighter : public QSyntaxHighlighter
{
    Q_OBJECT
public:
    typedef  QSet<QString> ChangeNumbers;

    explicit BaseAnnotationHighlighter(const ChangeNumbers &changeNumbers,
                                       QTextDocument *document = 0);
    virtual ~BaseAnnotationHighlighter();

    void setChangeNumbers(const ChangeNumbers &changeNumbers);

    virtual void highlightBlock(const QString &text);

private:
    // Implement this to return the change number of a line
    virtual QString changeNumber(const QString &block) const = 0;

    BaseAnnotationHighlighterPrivate *m_d;
};

} // namespace VCSBase

#endif // BASEANNOTATIONHIGHLIGHTER_H