+++ /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 H = Hierarchy
-module E = Entity
-module N = Level
-module B = Brg
-module BE = BrgEnvironment
-module BS = BrgSubstitution
-module BR = BrgReduction
-
-type message = (BR.kam, B.term) Log.message
-
-(* Internal functions *******************************************************)
-
-let level = 4
-
-let message1 st1 m t1 =
- L.et_items1 "In the environment" m st1 t1
-
-let log1 s m t =
- let s = s ^ " the term" in
- L.log BR.specs level (message1 s m t)
-
-let error1 err s m t =
- err (message1 s m t)
-
-let message3 m t1 t2 ?mu t3 =
- let sm, st1, st2 = "In the environment", "the term", "is of type" in
- match mu with
- | Some mu ->
- let smu, st3 = "but in the environment", "it must be of type" in
- L.et_items3 sm m st1 t1 st2 t2 ~sc3:smu ~c3:mu st3 t3
- | None ->
- let st3 = "but it must be of type" in
- L.et_items3 sm m st1 t1 st2 t2 st3 t3
-
-let error3 err m t1 t2 ?mu t3 =
- err (message3 m t1 t2 ?mu t3)
-
-let assert_convertibility err f st m u w v =
- if BR.are_convertible st m u m w then f () else
- error3 err m v w u
-
-let assert_applicability err f st m u w v =
- match BR.xwhd st m u with
- | _, B.Sort _ ->
- error1 err "not a function type" m u
- | mu, B.Bind (_, B.Abst (_, u), _) ->
- if BR.are_convertible st mu u m w then f () else
- error3 err m v w ~mu u
- | _ -> assert false (**)
-
-let rec b_type_of err f st m x =
- log1 "Now checking" m x;
- match x with
- | B.Sort (a, h) ->
- let h = H.apply h in f x (B.Sort (a, h))
- | B.LRef (_, i) ->
- begin match BR.get m i with
- | B.Abst (_, w) ->
- f x (BS.lift (succ i) (0) w)
- | B.Abbr (B.Cast (_, w, _)) ->
- f x (BS.lift (succ i) (0) w)
- | B.Abbr _ -> assert false
- | B.Void ->
- error1 err "reference to excluded variable" m x
- end
- | B.GRef (_, uri) ->
- begin match BE.get_entity uri with
- | _, _, E.Abst (_, w) -> f x w
- | _, _, E.Abbr (B.Cast (_, w, _)) -> f x w
- | _, _, E.Abbr _ -> assert false
- | _, _, E.Void ->
- error1 err "reference to unknown entry" m x
- end
- | B.Bind (a, B.Abbr v, t) ->
- let f xv xt tt =
- f (W.sh2 v xv t xt x (B.bind_abbr a)) (B.bind_abbr a xv tt)
- in
- let f xv m = b_type_of err (f xv) st m t in
- let f xv = f xv (BR.push m a (B.abbr xv)) in
- let f xv vv = match xv with
- | B.Cast _ -> f xv
- | _ -> f (B.Cast ([], vv, xv))
- in
- type_of err f st m v
- | B.Bind (a, B.Abst (n, u), t) ->
- let f xu xt tt =
- f (W.sh2 u xu t xt x (B.bind_abst n a)) (B.bind_abst (N.pred n) a xu tt)
- in
- let f xu m = b_type_of err (f xu) st m t in
- let f xu _ = f xu (BR.push m a (B.abst n xu)) in
- type_of err f st m u
- | B.Bind (a, B.Void, t) ->
- let f xt tt =
- f (W.sh1 t xt x (B.bind_void a)) (B.bind_void a tt)
- in
- b_type_of err f st (BR.push m a B.Void) t
-
- | B.Appl (a, v, t) ->
- let f xv vv xt tt =
- let f _ = f (W.sh2 v xv t xt x (B.appl a)) (B.appl a xv tt) in
- assert_applicability err f st m tt vv xv
- in
- let f xv vv = b_type_of err (f xv vv) st m t in
- type_of err f st m v
- | B.Cast (a, u, t) ->
- let f xu xt tt =
- let f _ = f (W.sh2 u xu t xt x (B.cast a)) xu in
- assert_convertibility err f st m xu tt xt
- in
- let f xu _ = b_type_of err (f xu) st m t in
- type_of err f st m u
-
-(* Interface functions ******************************************************)
-
-and type_of err f st m x =
- let f t u = L.unbox level; f t u in
- L.box level; b_type_of err f st m x
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