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_______________________________________________________________ *)
17 module BE = BrgEnvironment
18 module BR = BrgReduction
20 (* Internal functions *******************************************************)
24 let message1 st1 m t1 =
25 L.et_items1 "In the environment" m st1 t1
28 let s = s ^ " the term" in
29 L.log BR.specs level (message1 s m t)
31 let error1 err s m t =
34 let message2 m1 t1 m2 t2 =
35 let sm2, st2 = "In the environment", "the term" in
36 let sm1, st1 = "is valid, but in the environment", "it must be of type" in
37 L.et_items2 sm2 m2 st2 t2 ~sc2:sm1 ~c2:m1 st1 t1
39 let error2 err m1 t1 m2 t2 =
40 err (message2 m1 t1 m2 t2)
46 let assert_convertibility err f st m u t =
47 if BR.are_convertible st m zero u m one t then f () else
50 let assert_applicability err f st m v t =
51 match BR.xwhd st m None t with
53 error1 err "not a function" m t
54 | mw, B.Bind (_, B.Abst (_, w), _) ->
55 if BR.are_convertible st mw zero w m one v then f () else
57 | _ -> assert false (**)
59 let rec b_validate err f st m x =
60 if !G.trace >= level then log1 "Now checking" m x;
64 begin match BR.get m i with
68 error1 err "reference to excluded variable" m x
71 begin match BE.get_entity uri with
73 | _, _, _, E.Abbr _ -> f ()
75 error1 err "reference to unknown entry" m x
78 let f () = b_validate err f st (BR.push m a b) t in
80 | B.Abst (n, u) -> validate err f st m u
81 | B.Abbr v -> validate err f st m v
85 let f () = assert_applicability err f st m v t in
86 let f () = b_validate err f st m t in
89 let f () = assert_convertibility err f st m u t in
90 let f () = b_validate err f st m t in
93 (* Interface functions ******************************************************)
95 and validate err f st m x = b_validate err f st m x