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module CC.Name
import public Control.Relation
import Data.List
import Data.Singleton
import Data.Stream
import Decidable.Equality
import Text.Bounded
import Text.PrettyPrint.Prettyprinter
infix 4 ~~
-- Definitions -----------------------------------------------------------------
||| Names of variables.
export
Name : Type
Name = WithBounds String
%name Name n, m
||| Equivalence relation on names.
export
(~~) : Rel Name
m ~~ n = m.val = n.val
%name (~~) prf
-- Interfaces ------------------------------------------------------------------
export
Interpolation Name where
interpolate n = n.val
export
Pretty Name where
pretty n = pretty n.val
export
Reflexive Name (~~) where
reflexive = Refl
export
Symmetric Name (~~) where
symmetric prf = sym prf
export
Transitive Name (~~) where
transitive prf1 prf2 = trans prf1 prf2
export Equivalence Name (~~) where
-- Operations ------------------------------------------------------------------
||| Constructs a new name from a bounded String.
export
MkName : WithBounds String -> Name
MkName = id
||| Decides if two names are equivalent
export
decEquiv : (m, n : Name) -> Dec (m ~~ n)
decEquiv m n = decEq m.val n.val
||| Returns the bounds of `name`, if any.
export
bounds : (name : Name) -> Maybe Bounds
bounds name = if name.isIrrelevant then Nothing else Just name.bounds
||| Returns a new name not in the set.
export
fresh : Foldable f => f Name -> Name
fresh xs =
irrelevantBounds $
select (unfoldr (\n => ("_\{show n}", S n)) 0) $
sort $
foldMap (singleton . val) xs
where
select : Ord a => Stream a -> List a -> a
select (x :: xs) [] = x
select (x :: xs) (y :: ys) =
case compare x y of
LT => x
EQ => select xs ys
GT => select (x :: xs) ys
export
fresh' : Foldable f => Singleton {a = f Name} xs -> Name
fresh' (Val xs) = fresh xs
|
