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Require Import Coq.Lists.List.
Require Import Crypto.Compilers.Syntax.
Require Import Crypto.Compilers.Named.Syntax.
Local Open Scope list_scope.
Section language.
Context {base_type_code}
{op : flat_type base_type_code -> flat_type base_type_code -> Type}
{Name : Type}.
Local Notation exprf := (@exprf base_type_code op Name).
Local Notation expr := (@expr base_type_code op Name).
Fixpoint get_names_of_type {t} : interp_flat_type (fun _ : base_type_code => Name) t -> list Name
:= match t with
| Tbase T => fun n => n::nil
| Unit => fun _ => nil
| Prod A B => fun ab : interp_flat_type _ A * interp_flat_type _ B
=> @get_names_of_type _ (fst ab) ++ @get_names_of_type _ (snd ab)
end.
Fixpoint get_namesf {t} (e : exprf t) : list Name
:= match e with
| TT => nil
| Var _ x => x::nil
| Op _ _ opc args => @get_namesf _ args
| LetIn tx nx ex tC eC
=> get_names_of_type nx ++ (* @get_namesf _ ex ++ *) @get_namesf _ eC
| Pair _ ex _ ey
=> @get_namesf _ ex ++ @get_namesf _ ey
end.
Fixpoint get_names {t} (e : expr t) : list Name
:= match e with
| Abs _ _ n f => get_names_of_type n ++ get_namesf f
end.
End language.
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