(* $Id: cicTypeChecker.ml 8213 2008-03-13 18:48:26Z sacerdot $ *)
-(*
-exception CicEnvironmentError;;
-(*CSC l'indice x dei tipi induttivi e' t.c. n < x <= nn *)
-(*CSC questa funzione e' simile alla are_all_occurrences_positive, ma fa *)
-(*CSC dei controlli leggermente diversi. Viene invocata solamente dalla *)
-(*CSC strictly_positive *)
-(*CSC definizione (giusta???) tratta dalla mail di Hugo ;-) *)
-and weakly_positive context n nn uri te =
- let module C = Cic in
-(*CSC: Che schifo! Bisogna capire meglio e trovare una soluzione ragionevole!*)
- let dummy_mutind =
- C.MutInd (HelmLibraryObjects.Datatypes.nat_URI,0,[])
- in
- (*CSC: mettere in cicSubstitution *)
- let rec subst_inductive_type_with_dummy_mutind =
- function
- C.MutInd (uri',0,_) when UriManager.eq uri' uri ->
- dummy_mutind
- | C.Appl ((C.MutInd (uri',0,_))::tl) when UriManager.eq uri' uri ->
- dummy_mutind
- | C.Cast (te,ty) -> subst_inductive_type_with_dummy_mutind te
- | C.Prod (name,so,ta) ->
- C.Prod (name, subst_inductive_type_with_dummy_mutind so,
- subst_inductive_type_with_dummy_mutind ta)
- | C.Lambda (name,so,ta) ->
- C.Lambda (name, subst_inductive_type_with_dummy_mutind so,
- subst_inductive_type_with_dummy_mutind ta)
- | C.Appl tl ->
- C.Appl (List.map subst_inductive_type_with_dummy_mutind tl)
- | C.MutCase (uri,i,outtype,term,pl) ->
- C.MutCase (uri,i,
- subst_inductive_type_with_dummy_mutind outtype,
- subst_inductive_type_with_dummy_mutind term,
- List.map subst_inductive_type_with_dummy_mutind pl)
- | C.Fix (i,fl) ->
- C.Fix (i,List.map (fun (name,i,ty,bo) -> (name,i,
- subst_inductive_type_with_dummy_mutind ty,
- subst_inductive_type_with_dummy_mutind bo)) fl)
- | C.CoFix (i,fl) ->
- C.CoFix (i,List.map (fun (name,ty,bo) -> (name,
- subst_inductive_type_with_dummy_mutind ty,
- subst_inductive_type_with_dummy_mutind bo)) fl)
- | C.Const (uri,exp_named_subst) ->
- let exp_named_subst' =
- List.map
- (function (uri,t) -> (uri,subst_inductive_type_with_dummy_mutind t))
- exp_named_subst
- in
- C.Const (uri,exp_named_subst')
- | C.MutInd (uri,typeno,exp_named_subst) ->
- let exp_named_subst' =
- List.map
- (function (uri,t) -> (uri,subst_inductive_type_with_dummy_mutind t))
- exp_named_subst
- in
- C.MutInd (uri,typeno,exp_named_subst')
- | C.MutConstruct (uri,typeno,consno,exp_named_subst) ->
- let exp_named_subst' =
- List.map
- (function (uri,t) -> (uri,subst_inductive_type_with_dummy_mutind t))
- exp_named_subst
- in
- C.MutConstruct (uri,typeno,consno,exp_named_subst')
- | t -> t
- in
- match CicReduction.whd context te with
-(*
- C.Appl ((C.MutInd (uri',0,_))::tl) when UriManager.eq uri' uri -> true
-*)
- C.Appl ((C.MutInd (uri',_,_))::tl) when UriManager.eq uri' uri -> true
- | C.MutInd (uri',0,_) when UriManager.eq uri' uri -> true
- | C.Prod (C.Anonymous,source,dest) ->
- strictly_positive context n nn
- (subst_inductive_type_with_dummy_mutind source) &&
- weakly_positive ((Some (C.Anonymous,(C.Decl source)))::context)
- (n + 1) (nn + 1) uri dest
- | C.Prod (name,source,dest) when
- does_not_occur ((Some (name,(C.Decl source)))::context) 0 n dest ->
- (* dummy abstraction, so we behave as in the anonimous case *)
- strictly_positive context n nn
- (subst_inductive_type_with_dummy_mutind source) &&
- weakly_positive ((Some (name,(C.Decl source)))::context)
- (n + 1) (nn + 1) uri dest
- | C.Prod (name,source,dest) ->
- does_not_occur context n nn
- (subst_inductive_type_with_dummy_mutind source)&&
- weakly_positive ((Some (name,(C.Decl source)))::context)
- (n + 1) (nn + 1) uri dest
- | _ ->
- raise (TypeCheckerFailure (lazy "Malformed inductive constructor type"))
-
-(* instantiate_parameters ps (x1:T1)...(xn:Tn)C *)
-(* returns ((x_|ps|:T_|ps|)...(xn:Tn)C){ps_1 / x1 ; ... ; ps_|ps| / x_|ps|} *)
-and instantiate_parameters params c =
- let module C = Cic in
- match (c,params) with
- (c,[]) -> c
- | (C.Prod (_,_,ta), he::tl) ->
- instantiate_parameters tl
- (CicSubstitution.subst he ta)
- | (C.Cast (te,_), _) -> instantiate_parameters params te
- | (t,l) -> raise (AssertFailure (lazy "1"))
-
-and strictly_positive context n nn te =
- let module C = Cic in
- let module U = UriManager in
- match CicReduction.whd context te with
- | t when does_not_occur context n nn t -> true
- | C.Rel _ -> true
- | C.Cast (te,ty) ->
- (*CSC: bisogna controllare ty????*)
- strictly_positive context n nn te
- | C.Prod (name,so,ta) ->
- does_not_occur context n nn so &&
- strictly_positive ((Some (name,(C.Decl so)))::context) (n+1) (nn+1) ta
- | C.Appl ((C.Rel m)::tl) when m > n && m <= nn ->
- List.fold_right (fun x i -> i && does_not_occur context n nn x) tl true
- | C.Appl ((C.MutInd (uri,i,exp_named_subst))::tl) ->
- let (ok,paramsno,ity,cl,name) =
- let o,_ = CicEnvironment.get_obj CicUniv.empty_ugraph uri in
- match o with
- C.InductiveDefinition (tl,_,paramsno,_) ->
- let (name,_,ity,cl) = List.nth tl i in
- (List.length tl = 1, paramsno, ity, cl, name)
- (* (true, paramsno, ity, cl, name) *)
- | _ ->
- raise
- (TypeCheckerFailure
- (lazy ("Unknown inductive type:" ^ U.string_of_uri uri)))
- in
- let (params,arguments) = split tl paramsno in
- let lifted_params = List.map (CicSubstitution.lift 1) params in
- let cl' =
- List.map
- (fun (_,te) ->
- instantiate_parameters lifted_params
- (CicSubstitution.subst_vars exp_named_subst te)
- ) cl
- in
- ok &&
- List.fold_right
- (fun x i -> i && does_not_occur context n nn x)
- arguments true &&
- (*CSC: MEGAPATCH3 (sara' quella giusta?)*)
- List.fold_right
- (fun x i ->
- i &&
- weakly_positive
- ((Some (C.Name name,(Cic.Decl ity)))::context) (n+1) (nn+1) uri
- x
- ) cl' true
- | t -> false
-
-(* the inductive type indexes are s.t. n < x <= nn *)
-and are_all_occurrences_positive context uri indparamsno i n nn te =
- let module C = Cic in
- match CicReduction.whd context te with
- C.Appl ((C.Rel m)::tl) when m = i ->
- (*CSC: riscrivere fermandosi a 0 *)
- (* let's check if the inductive type is applied at least to *)
- (* indparamsno parameters *)
- let last =
- List.fold_left
- (fun k x ->
- if k = 0 then 0
- else
- match CicReduction.whd context x with
- C.Rel m when m = n - (indparamsno - k) -> k - 1
- | _ ->
- raise (TypeCheckerFailure
- (lazy
- ("Non-positive occurence in mutual inductive definition(s) [1]" ^
- UriManager.string_of_uri uri)))
- ) indparamsno tl
- in
- if last = 0 then
- List.fold_right (fun x i -> i && does_not_occur context n nn x) tl true
- else
- raise (TypeCheckerFailure
- (lazy ("Non-positive occurence in mutual inductive definition(s) [2]"^
- UriManager.string_of_uri uri)))
- | C.Rel m when m = i ->
- if indparamsno = 0 then
- true
- else
- raise (TypeCheckerFailure
- (lazy ("Non-positive occurence in mutual inductive definition(s) [3]"^
- UriManager.string_of_uri uri)))
- | C.Prod (C.Anonymous,source,dest) ->
- let b = strictly_positive context n nn source in
- b &&
- are_all_occurrences_positive
- ((Some (C.Anonymous,(C.Decl source)))::context) uri indparamsno
- (i+1) (n + 1) (nn + 1) dest
- | C.Prod (name,source,dest) when
- does_not_occur ((Some (name,(C.Decl source)))::context) 0 n dest ->
- (* dummy abstraction, so we behave as in the anonimous case *)
- strictly_positive context n nn source &&
- are_all_occurrences_positive
- ((Some (name,(C.Decl source)))::context) uri indparamsno
- (i+1) (n + 1) (nn + 1) dest
- | C.Prod (name,source,dest) ->
- does_not_occur context n nn source &&
- are_all_occurrences_positive ((Some (name,(C.Decl source)))::context)
- uri indparamsno (i+1) (n + 1) (nn + 1) dest
- | _ ->
- raise
- (TypeCheckerFailure (lazy ("Malformed inductive constructor type " ^
- (UriManager.string_of_uri uri))))
+(*
(* the boolean h means already protected *)
(* args is the list of arguments the type of the constructor that may be *)
(* found in head position must be applied to. *)
with DoesOccur -> false
;;
+(*CSC l'indice x dei tipi induttivi e' t.c. n < x <= nn *)
+(*CSC questa funzione e' simile alla are_all_occurrences_positive, ma fa *)
+(*CSC dei controlli leggermente diversi. Viene invocata solamente dalla *)
+(*CSC strictly_positive *)
+(*CSC definizione (giusta???) tratta dalla mail di Hugo ;-) *)
+let rec weakly_positive ~subst context n nn uri te =
+(*CSC: Che schifo! Bisogna capire meglio e trovare una soluzione ragionevole!*)
+ let dummy_mutind = C.Implicit `Hole in
+ (*CSC: mettere in cicSubstitution *)
+ let rec subst_inductive_type_with_dummy_mutind _ = function
+ | C.Const (Ref.Ref (_,uri',Ref.Ind 0)) when NUri.eq uri' uri -> dummy_mutind
+ | C.Appl ((C.Const (Ref.Ref (_,uri',Ref.Ind 0)))::tl) when NUri.eq uri' uri ->
+ dummy_mutind
+ | t -> U.map (fun _ x->x) () subst_inductive_type_with_dummy_mutind t
+ in
+ match R.whd context te with
+ | C.Const (Ref.Ref (_,uri',Ref.Ind _))
+ | C.Appl ((C.Const (Ref.Ref (_,uri',Ref.Ind _)))::_) when NUri.eq uri' uri -> true
+ | C.Prod (name,source,dest) when
+ does_not_occur ~subst ((name,C.Decl source)::context) 0 n dest ->
+ (* dummy abstraction, so we behave as in the anonimous case *)
+ strictly_positive ~subst context n nn
+ (subst_inductive_type_with_dummy_mutind () source) &&
+ weakly_positive ~subst ((name,C.Decl source)::context)
+ (n + 1) (nn + 1) uri dest
+ | C.Prod (name,source,dest) ->
+ does_not_occur ~subst context n nn
+ (subst_inductive_type_with_dummy_mutind () source)&&
+ weakly_positive ~subst ((name,C.Decl source)::context)
+ (n + 1) (nn + 1) uri dest
+ | _ ->
+ raise (TypeCheckerFailure (lazy "Malformed inductive constructor type"))
+
+(* instantiate_parameters ps (x1:T1)...(xn:Tn)C *)
+(* returns ((x_|ps|:T_|ps|)...(xn:Tn)C){ps_1 / x1 ; ... ; ps_|ps| / x_|ps|} *)
+and instantiate_parameters params c =
+ match c, params with
+ | c,[] -> c
+ | C.Prod (_,_,ta), he::tl -> instantiate_parameters tl (S.subst he ta)
+ | t,l -> raise (AssertFailure (lazy "1"))
+
+and strictly_positive ~subst context n nn te =
+ match R.whd context te with
+ | t when does_not_occur ~subst context n nn t -> true
+ | C.Rel _ -> true
+ | C.Prod (name,so,ta) ->
+ does_not_occur ~subst context n nn so &&
+ strictly_positive ~subst ((name,C.Decl so)::context) (n+1) (nn+1) ta
+ | C.Appl ((C.Rel m)::tl) when m > n && m <= nn ->
+ List.for_all (does_not_occur ~subst context n nn) tl
+ | C.Appl (C.Const (Ref.Ref (_,uri,Ref.Ind i) as r)::tl) ->
+ let _,paramsno,tyl,_,i = E.get_checked_indtys r in
+ let _,name,ity,cl = List.nth tyl i in
+ let ok = List.length tyl = 1 in
+ let params, arguments = HExtlib.split_nth paramsno tl in
+ let lifted_params = List.map (S.lift 1) params in
+ let cl =
+ List.map (fun (_,_,te) -> instantiate_parameters lifted_params te) cl
+ in
+ ok &&
+ List.for_all (does_not_occur ~subst context n nn) arguments &&
+ List.for_all
+ (weakly_positive ~subst ((name,C.Decl ity)::context) (n+1) (nn+1) uri) cl
+ | _ -> false
+
+(* the inductive type indexes are s.t. n < x <= nn *)
+and are_all_occurrences_positive ~subst context uri indparamsno i n nn te =
+ match R.whd context te with
+ | C.Appl ((C.Rel m)::tl) when m = i ->
+ let last =
+ List.fold_left
+ (fun k x ->
+ if k = 0 then 0
+ else
+ match R.whd context x with
+ | C.Rel m when m = n - (indparamsno - k) -> k - 1
+ | _ -> raise (TypeCheckerFailure (lazy
+ ("Non-positive occurence in mutual inductive definition(s) [1]" ^
+ NUri.string_of_uri uri))))
+ indparamsno tl
+ in
+ if last = 0 then
+ List.for_all (does_not_occur ~subst context n nn) tl
+ else
+ raise (TypeCheckerFailure
+ (lazy ("Non-positive occurence in mutual inductive definition(s) [2]"^
+ NUri.string_of_uri uri)))
+ | C.Rel m when m = i ->
+ if indparamsno = 0 then
+ true
+ else
+ raise (TypeCheckerFailure
+ (lazy ("Non-positive occurence in mutual inductive definition(s) [3]"^
+ NUri.string_of_uri uri)))
+ | C.Prod (name,source,dest) when
+ does_not_occur ~subst ((name,C.Decl source)::context) 0 n dest ->
+ strictly_positive ~subst context n nn source &&
+ are_all_occurrences_positive ~subst
+ ((name,C.Decl source)::context) uri indparamsno
+ (i+1) (n + 1) (nn + 1) dest
+ | C.Prod (name,source,dest) ->
+ does_not_occur ~subst context n nn source &&
+ are_all_occurrences_positive ~subst ((name,C.Decl source)::context)
+ uri indparamsno (i+1) (n + 1) (nn + 1) dest
+ | _ ->
+ raise
+ (TypeCheckerFailure (lazy ("Malformed inductive constructor type " ^
+ (NUri.string_of_uri uri))))
+;;
+
exception NotGuarded of string Lazy.t;;
let rec typeof ~subst ~metasenv context term =
let debruijnedte = debruijn uri len te in
ignore (typeof ~subst ~metasenv tys debruijnedte);
(* let's check also the positivity conditions *)
- if false (*
+ if
not
- (are_all_occurrences_positive tys uri indparamsno i 0 len
- debruijnedte) *)
+ (are_all_occurrences_positive ~subst tys uri leftno i 0 len
+ debruijnedte)
then
raise
(TypeCheckerFailure
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