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Added several methods #20

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Added several methods #20

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d9d7662
Added several methods
xgrommx Jul 31, 2018
6485346
replace custom mapMaybe with filterMap
xgrommx Jul 31, 2018
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4 changes: 3 additions & 1 deletion bower.json
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Expand Up @@ -18,6 +18,8 @@
],
"dependencies": {
"purescript-tuples": "^5.0.0",
"purescript-gen": "^2.0.0"
"purescript-gen": "^2.0.0",
"purescript-filterable": "^3.0.1",
"purescript-profunctor-lenses": "^4.0.0"
}
}
47 changes: 44 additions & 3 deletions src/Data/These.purs
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Expand Up @@ -3,12 +3,15 @@ module Data.These where
import Prelude

import Control.Extend (class Extend)
import Data.Bifunctor (class Bifunctor)
import Data.Bifunctor (class Bifunctor, bimap)
import Data.Bitraversable (class Bitraversable, class Bifoldable, bitraverse)
import Data.Either (Either(..))
import Data.Filterable (class Filterable, filterMap)
import Data.Functor.Invariant (class Invariant, imapF)
import Data.Maybe (Maybe(..))
import Data.Lens (Prism, prism)
import Data.Maybe (Maybe(..), isJust)
import Data.Traversable (class Traversable, class Foldable, foldMap, foldl, foldr)
import Data.Tuple (Tuple(..))
import Data.Tuple (Tuple(..), uncurry)

data These a b
= This a
Expand Down Expand Up @@ -147,3 +150,41 @@ that :: forall a b. These a b -> Maybe b
that = case _ of
That x -> Just x
_ -> Nothing

both :: forall a b. These a b -> Maybe (Tuple a b)
both = case _ of
Both a x -> Just (Tuple a x)
_ -> Nothing

mergeThese :: forall a. (a -> a -> a) -> These a a -> a
mergeThese = these identity identity

mergeTheseWith :: forall a b c. (a -> c) -> (b -> c) -> (c -> c -> c) -> These a b -> c
mergeTheseWith f g op t = mergeThese op $ bimap f g t

isThis :: forall a b. These a b -> Boolean
isThis = isJust <<< this

isThat :: forall a b. These a b -> Boolean
isThat = isJust <<< that

isBoth :: forall a b. These a b -> Boolean
isBoth = isJust <<< both

catThis :: forall t a b. Filterable t => Functor t => t (These a b) -> t a
catThis = filterMap this

catThat :: forall t a b. Filterable t => Functor t => t (These a b) -> t b
catThat = filterMap that

catThese :: forall t a b. Filterable t => Functor t => t (These a b) -> t (Tuple a b)
catThese = filterMap both

_This :: forall a b. Prism (These a b) (These a b) a a
_This = prism This (these Right (Left <<< That) (\x y -> Left $ Both x y))

_That :: forall a b. Prism (These a b) (These a b) b b
_That = prism That (these (Left <<< This) Right (\x y -> Left $ Both x y))

_Both :: forall a b. Prism (These a b) (These a b) (Tuple a b) (Tuple a b)
_Both = prism (uncurry Both) (these (Left <<< This) (Left <<< That) (\x y -> Right (Tuple x y)))