/************************************************************************
 ************************************************************************
    FAUST compiler
	Copyright (C) 2003-2004 GRAME, Centre National de Creation Musicale
    ---------------------------------------------------------------------
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 ************************************************************************
 ************************************************************************/

#ifndef __OCCURENCES__
#define __OCCURENCES__

#include "tlib.hh"

/**
 * Count subtree occurences
 * Count the number of occurences of each subtree of a root tree.
 */

class Occurrences
{
	Tree	fKey;					// specific property key

 public:
	Occurrences(Tree root);			// count the occurrences of each subtree of root
	int getCount(Tree t);			// return the number of occurrences of t in root

 private:
	Tree specificKey(Tree root);	// specific key for occurences counting in root
	void countOccurrences(Tree t);	// increment the occurrences of t and its subtrees
	void setCount(Tree t, int c);	// set the number of occurrences of t
};

#endif
