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|
(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
open Names
open Constr
(** {6 Occur checks } *)
(** [closedn n M] is true iff [M] is a (de Bruijn) closed term under n binders *)
val closedn : int -> constr -> bool
(** [closed0 M] is true iff [M] is a (de Bruijn) closed term *)
val closed0 : constr -> bool
(** [noccurn n M] returns true iff [Rel n] does NOT occur in term [M] *)
val noccurn : int -> constr -> bool
(** [noccur_between n m M] returns true iff [Rel p] does NOT occur in term [M]
for n <= p < n+m *)
val noccur_between : int -> int -> constr -> bool
(** Checking function for terms containing existential- or
meta-variables. The function [noccur_with_meta] does not consider
meta-variables applied to some terms (intended to be its local
context) (for existential variables, it is necessarily the case) *)
val noccur_with_meta : int -> int -> constr -> bool
(** {6 Relocation and substitution } *)
(** [exliftn el c] lifts [c] with lifting [el] *)
val exliftn : Esubst.lift -> constr -> constr
(** [liftn n k c] lifts by [n] indexes above or equal to [k] in [c] *)
val liftn : int -> int -> constr -> constr
(** [lift n c] lifts by [n] the positive indexes in [c] *)
val lift : int -> constr -> constr
(** The type [substl] is the type of substitutions [u₁..un] of type
some context Δ and defined in some environment Γ. Typing of
substitutions is defined by:
- Γ ⊢ ∅ : ∅,
- Γ ⊢ u₁..u{_n-1} : Δ and Γ ⊢ u{_n} : An\[u₁..u{_n-1}\] implies
Γ ⊢ u₁..u{_n} : Δ,x{_n}:A{_n}
- Γ ⊢ u₁..u{_n-1} : Δ and Γ ⊢ un : A{_n}\[u₁..u{_n-1}\] implies
Γ ⊢ u₁..u{_n} : Δ,x{_n}:=c{_n}:A{_n} when Γ ⊢ u{_n} ≡ c{_n}\[u₁..u{_n-1}\]
Note that [u₁..un] is represented as a list with [un] at the head of
the list, i.e. as [[un;...;u₁]]. *)
type substl = constr list
(** Let [Γ] be a context interleaving declarations [x₁:T₁..xn:Tn]
and definitions [y₁:=c₁..yp:=cp] in some context [Γ₀]. Let
[u₁..un] be an {e instance} of [Γ], i.e. an instance in [Γ₀]
of the [xi]. Then, [subst_of_rel_context_instance Γ u₁..un]
returns the corresponding {e substitution} of [Γ], i.e. the
appropriate interleaving [σ] of the [u₁..un] with the [c₁..cp],
all of them in [Γ₀], so that a derivation [Γ₀, Γ, Γ₁|- t:T]
can be instantiated into a derivation [Γ₀, Γ₁ |- t[σ]:T[σ]] using
[substnl σ |Γ₁| t].
Note that the instance [u₁..un] is represented starting with [u₁],
as if usable in [applist] while the substitution is
represented the other way round, i.e. ending with either [u₁] or
[c₁], as if usable for [substl]. *)
val subst_of_rel_context_instance : Constr.rel_context -> constr list -> substl
(** For compatibility: returns the substitution reversed *)
val adjust_subst_to_rel_context : Constr.rel_context -> constr list -> constr list
(** Take an index in an instance of a context and returns its index wrt to
the full context (e.g. 2 in [x:A;y:=b;z:C] is 3, i.e. a reference to z) *)
val adjust_rel_to_rel_context : ('a, 'b) Context.Rel.pt -> int -> int
(** [substnl [a₁;...;an] k c] substitutes in parallel [a₁],...,[an]
for respectively [Rel(k+1)],...,[Rel(k+n)] in [c]; it relocates
accordingly indexes in [an],...,[a1] and [c]. In terms of typing, if
Γ ⊢ a{_n}..a₁ : Δ and Γ, Δ, Γ' ⊢ c : T with |Γ'|=k, then
Γ, Γ' ⊢ [substnl [a₁;...;an] k c] : [substnl [a₁;...;an] k T]. *)
val substnl : substl -> int -> constr -> constr
(** [substl σ c] is a short-hand for [substnl σ 0 c] *)
val substl : substl -> constr -> constr
(** [substl a c] is a short-hand for [substnl [a] 0 c] *)
val subst1 : constr -> constr -> constr
(** [substnl_decl [a₁;...;an] k Ω] substitutes in parallel [a₁], ..., [an]
for respectively [Rel(k+1)], ..., [Rel(k+n)] in [Ω]; it relocates
accordingly indexes in [a₁],...,[an] and [c]. In terms of typing, if
Γ ⊢ a{_n}..a₁ : Δ and Γ, Δ, Γ', Ω ⊢ with |Γ'|=[k], then
Γ, Γ', [substnl_decl [a₁;...;an]] k Ω ⊢. *)
val substnl_decl : substl -> int -> Constr.rel_declaration -> Constr.rel_declaration
(** [substl_decl σ Ω] is a short-hand for [substnl_decl σ 0 Ω] *)
val substl_decl : substl -> Constr.rel_declaration -> Constr.rel_declaration
(** [subst1_decl a Ω] is a short-hand for [substnl_decl [a] 0 Ω] *)
val subst1_decl : constr -> Constr.rel_declaration -> Constr.rel_declaration
(** [replace_vars k [(id₁,c₁);...;(idn,cn)] t] substitutes [Var idj] by
[cj] in [t]. *)
val replace_vars : (Id.t * constr) list -> constr -> constr
(** [substn_vars k [id₁;...;idn] t] substitutes [Var idj] by [Rel j+k-1] in [t].
If two names are identical, the one of least index is kept. In terms of
typing, if Γ,x{_n}:U{_n},...,x₁:U₁,Γ' ⊢ t:T, together with id{_j}:T{_j} and
Γ,x{_n}:U{_n},...,x₁:U₁,Γ' ⊢ T{_j}\[id{_j+1}..id{_n}:=x{_j+1}..x{_n}\] ≡ Uj,
then Γ\\{id₁,...,id{_n}\},x{_n}:U{_n},...,x₁:U₁,Γ' ⊢ [substn_vars
(|Γ'|+1) [id₁;...;idn] t] : [substn_vars (|Γ'|+1) [id₁;...;idn]
T]. *)
val substn_vars : int -> Id.t list -> constr -> constr
(** [subst_vars [id1;...;idn] t] is a short-hand for [substn_vars
[id1;...;idn] 1 t]: it substitutes [Var idj] by [Rel j] in [t]. If
two names are identical, the one of least index is kept. *)
val subst_vars : Id.t list -> constr -> constr
(** [subst_var id t] is a short-hand for [substn_vars [id] 1 t]: it
substitutes [Var id] by [Rel 1] in [t]. *)
val subst_var : Id.t -> constr -> constr
(** {3 Substitution of universes} *)
open Univ
(** Level substitutions for polymorphism. *)
val subst_univs_level_constr : universe_level_subst -> constr -> constr
val subst_univs_level_context : Univ.universe_level_subst -> Constr.rel_context -> Constr.rel_context
(** Instance substitution for polymorphism. *)
val subst_instance_constr : Instance.t -> constr -> constr
val subst_instance_context : Instance.t -> Constr.rel_context -> Constr.rel_context
|
