+++ /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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