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|
(* $Id$ *)
open Pp
open Util
open Names
open Generic
open Term
open Sign
open Evd
open Constant
open Inductive
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 (List.map make_substituend args)) c
let instantiate_type ids tty args =
{ body = instantiate_constr ids tty.body args;
typ = tty.typ }
(* Constants. *)
(* constant_type gives the type of a constant *)
let constant_type env k =
let (sp,args) = destConst k in
let cb = lookup_constant sp env in
instantiate_type
(ids_of_sign cb.const_hyps) cb.const_type (Array.to_list args)
let constant_value env k =
let (sp,args) = destConst k in
let cb = lookup_constant sp env in
if not cb.const_opaque & defined_constant env k then
match cb.const_body with
| Some body ->
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." >]
else
failwith "opaque"
let const_abst_opt_value env c =
match c with
| DOPN(Const sp,_) ->
if evaluable_constant env c then Some (constant_value env c) else None
| DOPN(Abst sp,_) ->
if evaluable_abst env c then Some (abst_value env c) else None
| _ -> invalid_arg "const_abst_opt_value"
let mis_lc env mis =
instantiate_constr (ids_of_sign mis.mis_mib.mind_hyps) mis.mis_mip.mind_lc
(Array.to_list mis.mis_args)
(* Existentials. *)
let name_of_existential n = id_of_string ("?" ^ string_of_int n)
let existential_type sigma c =
let (n,args) = destEvar c in
let info = Evd.map sigma n in
let hyps = evar_hyps info in
instantiate_constr (ids_of_sign hyps) info.evar_concl (Array.to_list args)
let existential_value sigma c =
let (n,args) = destEvar c in
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"
|
