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|
(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
open Names
open Errors
open Util
open Term
open Vars
open Entries
open Declarations
open Cooking
open Entries
open Context.Rel.Declaration
(********************************)
(* Discharging mutual inductive *)
let detype_param =
function
| LocalAssum (Name id, p) -> id, LocalAssumEntry p
| LocalDef (Name id, p,_) -> id, LocalDefEntry p
| _ -> anomaly (Pp.str "Unnamed inductive local variable")
(* Replace
Var(y1)..Var(yq):C1..Cq |- Ij:Bj
Var(y1)..Var(yq):C1..Cq; I1..Ip:B1..Bp |- ci : Ti
by
|- Ij: (y1..yq:C1..Cq)Bj
I1..Ip:(B1 y1..yq)..(Bp y1..yq) |- ci : (y1..yq:C1..Cq)Ti[Ij:=(Ij y1..yq)]
*)
let abstract_inductive hyps nparams inds =
let ntyp = List.length inds in
let nhyp = Context.Named.length hyps in
let args = Context.Named.to_instance (List.rev hyps) in
let args = Array.of_list args in
let subs = List.init ntyp (fun k -> lift nhyp (mkApp(mkRel (k+1),args))) in
let inds' =
List.map
(function (tname,arity,template,cnames,lc) ->
let lc' = List.map (substl subs) lc in
let lc'' = List.map (fun b -> Termops.it_mkNamedProd_wo_LetIn b hyps) lc' in
let arity' = Termops.it_mkNamedProd_wo_LetIn arity hyps in
(tname,arity',template,cnames,lc''))
inds in
let nparams' = nparams + Array.length args in
(* To be sure to be the same as before, should probably be moved to process_inductive *)
let params' = let (_,arity,_,_,_) = List.hd inds' in
let (params,_) = decompose_prod_n_assum nparams' arity in
List.map detype_param params
in
let ind'' =
List.map
(fun (a,arity,template,c,lc) ->
let _, short_arity = decompose_prod_n_assum nparams' arity in
let shortlc =
List.map (fun c -> snd (decompose_prod_n_assum nparams' c)) lc in
{ mind_entry_typename = a;
mind_entry_arity = short_arity;
mind_entry_template = template;
mind_entry_consnames = c;
mind_entry_lc = shortlc })
inds'
in (params',ind'')
let refresh_polymorphic_type_of_inductive (_,mip) =
match mip.mind_arity with
| RegularArity s -> s.mind_user_arity, false
| TemplateArity ar ->
let ctx = List.rev mip.mind_arity_ctxt in
mkArity (List.rev ctx, Type ar.template_level), true
let process_inductive (sechyps,abs_ctx) modlist mib =
let nparams = mib.mind_nparams in
let subst, univs =
if mib.mind_polymorphic then
let inst = Univ.UContext.instance mib.mind_universes in
let cstrs = Univ.UContext.constraints mib.mind_universes in
inst, Univ.UContext.make (inst, Univ.subst_instance_constraints inst cstrs)
else Univ.Instance.empty, mib.mind_universes
in
let inds =
Array.map_to_list
(fun mip ->
let ty, template = refresh_polymorphic_type_of_inductive (mib,mip) in
let arity = expmod_constr modlist ty in
let arity = Vars.subst_instance_constr subst arity in
let lc = Array.map
(fun c -> Vars.subst_instance_constr subst (expmod_constr modlist c))
mip.mind_user_lc
in
(mip.mind_typename,
arity, template,
Array.to_list mip.mind_consnames,
Array.to_list lc))
mib.mind_packets in
let sechyps' = Context.Named.map (expmod_constr modlist) sechyps in
let (params',inds') = abstract_inductive sechyps' nparams inds in
let abs_ctx = Univ.instantiate_univ_context abs_ctx in
let univs = Univ.UContext.union abs_ctx univs in
let record = match mib.mind_record with
| Some (Some (id, _, _)) -> Some (Some id)
| Some None -> Some None
| None -> None
in
{ mind_entry_record = record;
mind_entry_finite = mib.mind_finite;
mind_entry_params = params';
mind_entry_inds = inds';
mind_entry_polymorphic = mib.mind_polymorphic;
mind_entry_private = mib.mind_private;
mind_entry_universes = univs
}
|
