(*
    ||M||  This file is part of HELM, an Hypertextual, Electronic        
    ||A||  Library of Mathematics, developed at the Computer Science     
    ||T||  Department, University of Bologna, Italy.                     
    ||I||                                                                
    ||T||  HELM is free software; you can redistribute it and/or         
    ||A||  modify it under the terms of the GNU General Public License   
    \   /  version 2 or (at your option) any later version.              
     \ /   This software is distributed as is, NO WARRANTY.              
      V_______________________________________________________________ *)

module L = Log
module B = Brg
module E = BrgEnvironment
module R = BrgReduction
module T = BrgType

(* Interface functions ******************************************************)

(* to share *)
let type_check err f ?(si=false) g = function
   | None                           -> f None None
   | Some (e, uri, B.Abst (a, t))   ->
      let f tt entry = f (Some tt) (Some entry) in
      let f xt tt = E.set_entry (f tt) (e, uri, B.abst a xt) in
      L.loc := e; T.type_of err f ~si g R.empty_kam t
   | Some (e, uri, B.Abbr (a, t))   ->
      let f tt entry = f (Some tt) (Some entry) in
      let f xt tt = E.set_entry (f tt) (e, uri, B.abbr a xt) in
      L.loc := e; T.type_of err f ~si g R.empty_kam t
   | Some (e, uri, (B.Void _ as b)) ->
      let f entry = f None (Some entry) in
      L.loc := e; E.set_entry f (e, uri, b)