--  PSL - Utils
--  Copyright (C) 2002-2016 Tristan Gingold
--
--  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, see <gnu.org/licenses>.

package PSL.NFAs.Utils is
   --  Sort outgoing edges by expression.
   procedure Sort_Src_Edges (S : NFA_State);
   procedure Sort_Src_Edges (N : NFA);

   procedure Sort_Dest_Edges (S : NFA_State);
   procedure Sort_Dest_Edges (N : NFA);

   --  Move incoming edges of S1 to S, remove S1 and its outgoing edges.
   procedure Merge_State_Dest (N : NFA; S : NFA_State; S1 : NFA_State);

   procedure Merge_State_Src (N : NFA; S : NFA_State; S1 : NFA_State);

   --  Return True if N or a child of N is EOS.
   --  N must be a boolean expression.
   function Has_EOS (N : Node) return Boolean;

   --  Ensure there is an edge from init state to itself, for the implicit
   --  [*] of cover directive.
   procedure Set_Init_Loop (N : NFA);

   --  Raise Program_Error if N is not internally coherent.
   procedure Check_NFA (N : NFA);
end PSL.NFAs.Utils;