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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 ids args =
let is_id id = function
| VAR id' -> id = id'
| _ -> false
in
List.for_all2 is_id ids args
let instantiate_constr ids c args =
if is_id_inst ids args then
c
else
replace_vars (List.combine ids args) c
let instantiate_type ids tty args =
typed_app (fun c -> instantiate_constr ids 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
(ids_of_sign cb.const_hyps) cb.const_type (Array.to_list args)
type const_evaluation_error = NotDefinedConst | OpaqueConst
exception NotEvaluableConst of const_evaluation_error
let constant_value env cst =
let (sp,args) = destConst cst in
let cb = lookup_constant sp env in
if cb.const_opaque then raise (NotEvaluableConst OpaqueConst) else
if not (is_defined cb) then raise (NotEvaluableConst NotDefinedConst) else
match cb.const_body with
| Some v ->
let body = cook_constant v in
instantiate_constr
(ids_of_sign cb.const_hyps) body (Array.to_list args)
| None ->
anomalylabstrm "termenv__constant_value"
[< 'sTR "a defined constant with no body." >]
(* 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 (ids_of_sign hyps) info.evar_concl (Array.to_list args)
let existential_value sigma (n,args) =
let info = Evd.map sigma n in
let hyps = evar_hyps info in
match info.evar_body with
| Evar_defined c ->
instantiate_constr (ids_of_sign hyps) c (Array.to_list args)
| Evar_empty ->
anomaly "a defined existential with no body"
let const_abst_opt_value env sigma c =
match c with
| DOPN(Const sp,_) ->
if evaluable_constant env c then Some (constant_value env c) else None
| DOPN(Evar ev,args) ->
if Evd.is_defined sigma ev then
Some (existential_value sigma (ev,args))
else
None
| DOPN(Abst sp,_) ->
if evaluable_abst env c then Some (abst_value env c) else None
| _ -> invalid_arg "const_abst_opt_value"
|
