{-# OPTIONS_GHC -fno-warn-orphans #-}

module Data.Validity.Set where

import Data.Validity

import Data.Set (Set)
import qualified Data.Set as S

-- | A 'Set' of things is valid if all the elements are valid and the 'Set' itself
-- is valid.
instance (Ord v, Validity v) => Validity (Set v) where
    validate :: Set v -> Validation
validate s :: Set v
s =
        [Validation] -> Validation
forall a. Monoid a => [a] -> a
mconcat
            [ String -> Bool -> Validation
declare "The set structure is valid." (Bool -> Validation) -> Bool -> Validation
forall a b. (a -> b) -> a -> b
$ Set v -> Bool
forall a. Ord a => Set a -> Bool
S.valid Set v
s
            , [v] -> String -> Validation
forall a. Validity a => a -> String -> Validation
annotate (Set v -> [v]
forall a. Set a -> [a]
S.toList Set v
s) "Set elements"
            ]