(* ========================================================================= *)
(* MATCHING AND UNIFICATION FOR SETS OF FIRST ORDER LOGIC TERMS *)
(* Copyright (c) 2001 Joe Hurd, distributed under the BSD License *)
(* ========================================================================= *)
signature TermNet =
sig
(* ------------------------------------------------------------------------- *)
(* A type of term sets that can be efficiently matched and unified. *)
(* ------------------------------------------------------------------------- *)
type parameters = {fifo : bool}
type 'a termNet
(* ------------------------------------------------------------------------- *)
(* Basic operations. *)
(* ------------------------------------------------------------------------- *)
val new : parameters -> 'a termNet
val null : 'a termNet -> bool
val size : 'a termNet -> int
val insert : 'a termNet -> Term.term * 'a -> 'a termNet
val fromList : parameters -> (Term.term * 'a) list -> 'a termNet
val filter : ('a -> bool) -> 'a termNet -> 'a termNet
val toString : 'a termNet -> string
val pp : 'a Print.pp -> 'a termNet Print.pp
(* ------------------------------------------------------------------------- *)
(* Matching and unification queries. *)
(* *)
(* These function return OVER-APPROXIMATIONS! *)
(* Filter afterwards to get the precise set of satisfying values. *)
(* ------------------------------------------------------------------------- *)
val match : 'a termNet -> Term.term -> 'a list
val matched : 'a termNet -> Term.term -> 'a list
val unify : 'a termNet -> Term.term -> 'a list
end