--  PSL - Optimize NFA
--  Copyright (C) 2002-2016 Tristan Gingold
--
--  GHDL 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, or (at your option) any later
--  version.
--
--  GHDL 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 GHDL; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.

with PSL.NFAs; use PSL.NFAs;
with PSL.Nodes; use PSL.Nodes;

package PSL.Optimize is
   --  Remove unreachable states, ie
   --  *  states that can't be reach from the start state.
   --  *  states that can't reach the final state.
   --  O(N) algorithm.
   procedure Remove_Unreachable_States (N : NFA);

   --  Remove single prefix, ie edges to a state S that is also from start
   --  to S.
   --  O(M) algorithm.
   procedure Remove_Simple_Prefix (N : NFA);

   procedure Merge_Identical_States (N : NFA);

   procedure Merge_Edges (N : NFA);

   procedure Remove_Identical_Src_Edges (S : NFA_State);
   procedure Remove_Identical_Dest_Edges (S : NFA_State);

   --procedure Find_Partitions (N : NFA; Nbr_States : Natural);
end PSL.Optimize;