/* This file is part of KDevelop
    Copyright 2010 David Nolden <david.nolden.kdevelop@art-master.de>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110-1301, USA.
*/
#ifndef CURSORINREVISION_H
#define CURSORINREVISION_H

#include "../languageexport.h"
#include "simplecursor.h"

namespace KDevelop {
  
  /**
  * Represents a cursor (line-number and column-number) within a text document.
  *
  * In KDevelop, this object is used when referencing a cursor that does _not_ point into the
  * most most current document revision. Therefore, before applying such a cursor in the text
  * documents, it has to be translated into the current document revision explicity, thereby replaying
  * eventual changes (see DUChainBase::translate...)
  */

class KDEVPLATFORMLANGUAGE_EXPORT CursorInRevision {
public:

 int line, column;

 CursorInRevision() : line(0), column(0) {
 }

 CursorInRevision(int _line, int _column) : line(_line), column(_column) {
 }

 static CursorInRevision invalid() {
     return CursorInRevision(-1, -1);
 }

 bool isValid() const {
     return line != -1 || column != -1;
 }

 bool operator<(const CursorInRevision& rhs) const {
     return line < rhs.line || (line == rhs.line && column < rhs.column);
 }
 
 bool operator<=(const CursorInRevision& rhs) const {
     return line < rhs.line || (line == rhs.line && column <= rhs.column);
 }

 bool operator>(const CursorInRevision& rhs) const {
     return line > rhs.line || (line == rhs.line && column > rhs.column);
 }
 
 bool operator>=(const CursorInRevision& rhs) const {
     return line > rhs.line || (line == rhs.line && column >= rhs.column);
 }

 bool operator ==(const CursorInRevision& rhs) const {
     return line == rhs.line && column == rhs.column;
 }
 
 bool operator !=(const CursorInRevision& rhs) const {
     return !(*this == rhs);
 }

 CursorInRevision operator +(const CursorInRevision& rhs) const {
     return CursorInRevision(line + rhs.line, column + rhs.column);
 }
 
 /// @warning Using this is wrong in most cases! If you want
 ///  to transform this cursor to the current revision, you should do a proper
 ///  mapping instead through @ref KDevelop::DUChainBase or @ref KDevelop::RevisionReference
 ///  or @ref KDevelop::DocumentChangeTracker
 SimpleCursor castToSimpleCursor() const {
   return SimpleCursor(line, column);
 }
 
 /// @warning Using this is wrong in most cases! If you want
 ///  to transform this cursor to the current revision, you should do a proper
 ///  mapping instead through @ref KDevelop::DUChainBase or @ref KDevelop::RevisionReference
 ///  or @ref KDevelop::DocumentChangeTracker
 static CursorInRevision castFromSimpleCursor(const SimpleCursor& cursor) {
   return CursorInRevision(cursor.line, cursor.column);
 }

 /// kDebug() stream operator.  Writes this cursor to the debug output in a nicely formatted way.
 inline friend QDebug operator<< (QDebug s, const CursorInRevision& cursor) {
   s.nospace() << "(" << cursor.line << ", " << cursor.column << ")";
   return s.space();
 }
};

inline uint qHash(const KDevelop::CursorInRevision& cursor) {
    return cursor.line * 53 + cursor.column * 47;
}

} // namespace KDevelop

Q_DECLARE_TYPEINFO(KDevelop::CursorInRevision, Q_MOVABLE_TYPE);

#endif
