2 ||M|| This file is part of HELM, an Hypertextual, Electronic
3 ||A|| Library of Mathematics, developed at the Computer Science
4 ||T|| Department, University of Bologna, Italy.
6 ||T|| HELM is free software; you can redistribute it and/or
7 ||A|| modify it under the terms of the GNU General Public License
8 \ / version 2 or (at your option) any later version.
9 \ / This software is distributed as is, NO WARRANTY.
10 V_______________________________________________________________ *)
19 module E = BrgEnvironment
20 module S = BrgSubstitution
21 module R = BrgReduction
23 (* Internal functions *******************************************************)
28 let s = s ^ " the term" in
29 L.log O.specs level (R.message1 s m t)
32 raise (R.TypeError (R.message1 s m t))
34 (* Interface functions ******************************************************)
36 let rec b_type_of f ~si g m x =
37 log1 "Now checking" m x;
40 let f h = f x (B.Sort (a, h)) in H.apply f g h
44 S.lift (f x) (succ i) (0) w
45 | B.Abbr (B.Cast (_, w, _)) ->
46 S.lift (f x) (succ i) (0) w
47 | B.Abbr _ -> assert false
49 error1 "reference to excluded variable" m x
54 | _, _, B.Abst w -> f x w
55 | _, _, B.Abbr (B.Cast (_, w, _)) -> f x w
56 | _, _, B.Abbr _ -> assert false
58 error1 "reference to excluded object" m x
61 | B.Bind (a, B.Abbr v, t) ->
63 f (A.sh2 v xv t xt x (B.bind_abbr a)) (B.bind_abbr a xv tt)
65 let f xv m = b_type_of (f xv) ~si g m t in
66 let f xv = R.push (f xv) m a (B.Abbr xv) in
67 let f xv vv = match xv with
69 | _ -> f (B.Cast ([], vv, xv))
72 | B.Bind (a, B.Abst u, t) ->
74 f (A.sh2 u xu t xt x (B.bind_abst a)) (B.bind_abst a xu tt)
76 let f xu m = b_type_of (f xu) ~si g m t in
77 let f xu _ = R.push (f xu) m a (B.Abst xu) in
79 | B.Bind (a, B.Void, t) ->
81 f (A.sh1 t xt x (B.bind a B.Void)) (B.bind a B.Void tt)
83 let f m = b_type_of f ~si g m t in
87 let f () = f (A.sh2 v xv t xt x (B.appl a)) (B.appl a xv tt) in
88 R.assert_conversion f ~si ~rt:true m tt vv xv
90 let f xv vv = b_type_of (f xv vv) ~si g m t in
94 let f () = f (A.sh2 u xu t xt x (B.cast a)) xu in
95 R.assert_conversion f ~si m xu tt xt
97 let f xu _ = b_type_of (f xu) ~si g m t in
100 and type_of f ?(si=false) g m x =
101 let f t u = L.unbox level; f t u in
102 L.box level; b_type_of f ~si g m x