--- /dev/null
+(*
+ ||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 U = NUri
+module C = Cps
+module W = Share
+module L = Log
+module E = Entity
+module H = Hierarchy
+module S = Status
+module Z = Bag
+module ZO = BagOutput
+module ZE = BagEnvironment
+module ZR = BagReduction
+
+exception TypeError of Z.message
+
+(* Internal functions *******************************************************)
+
+let level = 4
+
+let log1 s c t =
+ let sc, st = s ^ " in the envireonment", "the term" in
+ L.log ZO.specs level (L.et_items1 sc c st t)
+
+let error1 st c t =
+ let sc = "In the envireonment" in
+ raise (TypeError (L.et_items1 sc c st t))
+
+let error3 c t1 t2 t3 =
+ let sc, st1, st2, st3 =
+ "In the envireonment", "the term", "is of type", "but must be of type"
+ in
+ raise (TypeError (L.et_items3 sc c st1 t1 st2 t2 st3 t3))
+
+let mk_gref u l =
+ let map t v = Z.Appl (v, t) in
+ List.fold_left map (Z.GRef u) l
+
+(* Interface functions ******************************************************)
+
+let rec b_type_of f st c x =
+(* L.warn "Entering T.b_type_of"; *)
+ log1 "Now checking" c x;
+ match x with
+ | Z.Sort h ->
+ let h = H.apply h in f x (Z.Sort h)
+ | Z.LRef i ->
+ let err () = error1 "variable not found" c x in
+ let f _ = function
+ | Z.Abst w -> f x w
+ | Z.Abbr (Z.Cast (w, v)) -> f x w
+ | Z.Abbr _ -> assert false
+ | Z.Void -> error1 "reference to excluded variable" c x
+ in
+ Z.get err f c i
+ | Z.GRef uri ->
+ let f = function
+ | _, _, E.Abst (_, w) -> f x w
+ | _, _, E.Abbr (Z.Cast (w, v)) -> f x w
+ | _, _, E.Abbr _ -> assert false
+ | _, _, E.Void -> assert false
+ in
+ ZE.get_entity f uri
+ | Z.Bind (a, l, Z.Abbr v, t) ->
+ let f xv xt tt =
+ f (W.sh2 v xv t xt x (Z.bind_abbr a l)) (Z.bind_abbr a l xv tt)
+ in
+ let f xv cc = b_type_of (f xv) st cc t in
+ let f xv = Z.push "type abbr" (f xv) c a l (Z.Abbr xv) in
+ let f xv vv = match xv with
+ | Z.Cast _ -> f xv
+ | _ -> f (Z.Cast (vv, xv))
+ in
+ type_of f st c v
+ | Z.Bind (a, l, Z.Abst u, t) ->
+ let f xu xt tt =
+ f (W.sh2 u xu t xt x (Z.bind_abst a l)) (Z.bind_abst a l xu tt)
+ in
+ let f xu cc = b_type_of (f xu) st cc t in
+ let f xu _ = Z.push "type abst" (f xu) c a l (Z.Abst xu) in
+ type_of f st c u
+ | Z.Bind (a, l, Z.Void, t) ->
+ let f xt tt =
+ f (W.sh1 t xt x (Z.bind a l Z.Void)) (Z.bind a l Z.Void tt)
+ in
+ let f cc = b_type_of f st cc t in
+ Z.push "type void" f c a l Z.Void
+ | Z.Appl (v, t) ->
+ let f xv vv xt tt = function
+ | ZR.Abst w ->
+ L.box (succ level);
+ L.log ZO.specs (succ level) (L.t_items1 "Just scanned" c w);
+ L.unbox (succ level);
+ let f a =
+(* L.warn (Printf.sprintf "Convertible: %b" a); *)
+ if a then f (W.sh2 v xv t xt x Z.appl) (Z.appl xv tt)
+ else error3 c xv vv w
+ in
+ ZR.are_convertible f ~si:st.S.si c w vv
+ | _ ->
+ error1 "not a function" c xt
+ in
+ let f xv vv xt tt = ZR.ho_whd (f xv vv xt tt) c tt in
+ let f xv vv = b_type_of (f xv vv) st c t in
+ type_of f st c v
+ | Z.Cast (u, t) ->
+ let f xu xt tt a =
+ (* L.warn (Printf.sprintf "Convertible: %b" a); *)
+ if a then f (W.sh2 u xu t xt x Z.cast) xu else error3 c xt tt xu
+ in
+ let f xu xt tt = ZR.are_convertible (f xu xt tt) ~si:st.S.si c xu tt in
+ let f xu _ = b_type_of (f xu) st c t in
+ type_of f st c u
+
+and type_of f st c x =
+ let f t u = L.unbox level; f t u in
+ L.box level; b_type_of f st c x
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