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Add Eq1 and Ord1 instances #19

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Merged
merged 1 commit into from
Mar 26, 2017
Merged

Add Eq1 and Ord1 instances #19

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3 changes: 2 additions & 1 deletion bower.json
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,8 @@
"package.json"
],
"dependencies": {
"purescript-foldable-traversable": "^2.0.0"
"purescript-foldable-traversable": "^2.2.0",
"purescript-prelude": "^2.4.0"
},
"devDependencies": {
"purescript-assert": "^2.0.0",
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11 changes: 11 additions & 0 deletions src/Data/NonEmpty.purs
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Expand Up @@ -19,7 +19,9 @@ import Control.Alt ((<|>))
import Control.Alternative (class Alternative)
import Control.Plus (class Plus, empty)

import Data.Eq (class Eq1, eq1)
import Data.Foldable (class Foldable, foldl, foldr, foldMap)
import Data.Ord (class Ord1, compare1)
import Data.Traversable (class Traversable, traverse, sequence)

-- | A non-empty container of elements of type a.
Expand Down Expand Up @@ -70,8 +72,17 @@ instance showNonEmpty :: (Show a, Show (f a)) => Show (NonEmpty f a) where

derive instance eqNonEmpty :: (Eq a, Eq (f a)) => Eq (NonEmpty f a)

instance eq1NonEmpty :: Eq1 f => Eq1 (NonEmpty f) where
eq1 (NonEmpty a fa) (NonEmpty b fb) = a == b && fa `eq1` fb

derive instance ordNonEmpty :: (Ord a, Ord (f a)) => Ord (NonEmpty f a)

instance ord1NonEmpty :: Ord1 f => Ord1 (NonEmpty f) where
compare1 (NonEmpty a fa) (NonEmpty b fb) =
case compare a b of
EQ -> compare1 fa fb
c -> c

instance functorNonEmpty :: Functor f => Functor (NonEmpty f) where
map f (a :| fa) = f a :| map f fa

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