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|
(* $Id$ *)
open Pp
open Util
open Names
(* open Generic *)
open Term
open Sign
open Evd
open Declarations
open Environ
let is_id_inst inst =
let is_id (id,c) = match kind_of_term c with
| IsVar id' -> id = id'
| _ -> false
in
List.for_all is_id inst
let instantiate_constr sign c args =
let inst = instantiate_vars sign args in
if is_id_inst inst then
c
else
replace_vars inst c
let instantiate_type sign tty args =
typed_app (fun c -> instantiate_constr sign c args) tty
(* Constants. *)
(* constant_type gives the type of a constant *)
let constant_type env sigma (sp,args) =
let cb = lookup_constant sp env in
(* TODO: check args *)
instantiate_type cb.const_hyps cb.const_type (Array.to_list args)
type const_evaluation_result = NoBody | Opaque
exception NotEvaluableConst of const_evaluation_result
let constant_value env (sp,args) =
let cb = lookup_constant sp env in
if cb.const_opaque then raise (NotEvaluableConst Opaque) else
if not (is_defined cb) then raise (NotEvaluableConst NoBody) else
match cb.const_body with
| Some v ->
let body = cook_constant v in
instantiate_constr cb.const_hyps body (Array.to_list args)
| None ->
anomalylabstrm "termenv__constant_value"
[< 'sTR "a defined constant with no body." >]
let constant_opt_value env cst =
try Some (constant_value env cst)
with NotEvaluableConst _ -> None
(* Existentials. *)
let name_of_existential n = id_of_string ("?" ^ string_of_int n)
let existential_type sigma (n,args) =
let info = Evd.map sigma n in
let hyps = evar_hyps info in
(* TODO: check args [this comment was in Typeops] *)
instantiate_constr hyps info.evar_concl (Array.to_list args)
exception NotInstantiatedEvar
let existential_value sigma (n,args) =
let info = Evd.map sigma n in
let hyps = evar_hyps info in
match evar_body info with
| Evar_defined c ->
instantiate_constr hyps c (Array.to_list args)
| Evar_empty ->
raise NotInstantiatedEvar
let existential_opt_value sigma ev =
try Some (existential_value sigma ev)
with NotInstantiatedEvar -> None
|
