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Tuple.hs
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Tuple.hs
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{-# LANGUAGE CPP #-}
{-# LANGUAGE Rank2Types #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE UndecidableInstances #-}
-------------------------------------------------------------------------------
-- |
-- Module : Control.Lens.Tuple
-- Copyright : (C) 2012 Edward Kmett
-- License : BSD-style (see the file LICENSE)
-- Maintainer : Edward Kmett <ekmett@gmail.com>
-- Stability : provisional
-- Portability : Rank2Types
--
-------------------------------------------------------------------------------
module Control.Lens.Tuple
(
-- * Tuples
Field1(..)
, Field2(..)
, Field3(..)
, Field4(..)
, Field5(..)
, Field6(..)
, Field7(..)
, Field8(..)
, Field9(..)
) where
import Control.Lens.Type
import Data.Functor
-- | Provides access to 1st field of a tuple.
class Field1 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 1st field of a tuple (and possibly change its type).
--
-- >>> import Control.Lens
-- >>> (1,2)^._1
-- 1
--
-- >>> _1 .~ "hello" $ (1,2)
-- ("hello",2)
--
-- This can also be used on larger tuples as well
--
-- >>> _1 +~ 41 $ (1,2,3,4,5)
-- (42,2,3,4,5)
--
-- @
-- _1 :: 'Lens' (a,b) (a',b) a a'
-- _1 :: 'Lens' (a,b,c) (a',b,c) a a'
-- _1 :: 'Lens' (a,b,c,d) (a',b,c,d) a a'
-- ...
-- _1 :: 'Lens' (a,c,d,e,f,g,h,i) (a',b,c,d,e,f,g,h,i) a a'
-- @
_1 :: Lens a b c d
instance Field1 (a,b) (a',b) a a' where
_1 k (a,b) = (\a' -> (a',b)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c) (a',b,c) a a' where
_1 k (a,b,c) = (\a' -> (a',b,c)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c,d) (a',b,c,d) a a' where
_1 k (a,b,c,d) = (\a' -> (a',b,c,d)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c,d,e) (a',b,c,d,e) a a' where
_1 k (a,b,c,d,e) = (\a' -> (a',b,c,d,e)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c,d,e,f) (a',b,c,d,e,f) a a' where
_1 k (a,b,c,d,e,f) = (\a' -> (a',b,c,d,e,f)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c,d,e,f,g) (a',b,c,d,e,f,g) a a' where
_1 k (a,b,c,d,e,f,g) = (\a' -> (a',b,c,d,e,f,g)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c,d,e,f,g,h) (a',b,c,d,e,f,g,h) a a' where
_1 k (a,b,c,d,e,f,g,h) = (\a' -> (a',b,c,d,e,f,g,h)) <$> k a
{-# INLINE _1 #-}
instance Field1 (a,b,c,d,e,f,g,h,i) (a',b,c,d,e,f,g,h,i) a a' where
_1 k (a,b,c,d,e,f,g,h,i) = (\a' -> (a',b,c,d,e,f,g,h,i)) <$> k a
{-# INLINE _1 #-}
-- | Provides access to the 2nd field of a tuple
class Field2 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 2nd field of a tuple
--
-- >>> import Control.Lens
-- >>> _2 .~ "hello" $ (1,(),3,4)
-- (1,"hello",3,4)
--
-- @
-- 'Control.Lens.Fold.anyOf' '_2' :: (c -> 'Bool') -> (a, c) -> 'Bool'
-- 'Data.Traversable.traverse' '.' '_2' :: ('Applicative' f, 'Data.Traversable.Traversable' t) => (a -> f b) -> t (c, a) -> f (t (c, b))
-- 'Control.Lens.Fold.foldMapOf' ('Data.Traversable.traverse' '.' '_2') :: ('Data.Traversable.Traversable' t, 'Data.Monoid.Monoid' m) => (c -> m) -> t (b, c) -> m
-- @
_2 :: Lens a b c d
instance Field2 (a,b) (a,b') b b' where
_2 k (a,b) = (\b' -> (a,b')) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c) (a,b',c) b b' where
_2 k (a,b,c) = (\b' -> (a,b',c)) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c,d) (a,b',c,d) b b' where
_2 k (a,b,c,d) = (\b' -> (a,b',c,d)) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c,d,e) (a,b',c,d,e) b b' where
_2 k (a,b,c,d,e) = (\b' -> (a,b',c,d,e)) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c,d,e,f) (a,b',c,d,e,f) b b' where
_2 k (a,b,c,d,e,f) = (\b' -> (a,b',c,d,e,f)) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c,d,e,f,g) (a,b',c,d,e,f,g) b b' where
_2 k (a,b,c,d,e,f,g) = (\b' -> (a,b',c,d,e,f,g)) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c,d,e,f,g,h) (a,b',c,d,e,f,g,h) b b' where
_2 k (a,b,c,d,e,f,g,h) = (\b' -> (a,b',c,d,e,f,g,h)) <$> k b
{-# INLINE _2 #-}
instance Field2 (a,b,c,d,e,f,g,h,i) (a,b',c,d,e,f,g,h,i) b b' where
_2 k (a,b,c,d,e,f,g,h,i) = (\b' -> (a,b',c,d,e,f,g,h,i)) <$> k b
{-# INLINE _2 #-}
-- | Provides access to the 3rd field of a tuple
class Field3 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 3rd field of a tuple
_3 :: Lens a b c d
instance Field3 (a,b,c) (a,b,c') c c' where
_3 k (a,b,c) = (\c' -> (a,b,c')) <$> k c
{-# INLINE _3 #-}
instance Field3 (a,b,c,d) (a,b,c',d) c c' where
_3 k (a,b,c,d) = (\c' -> (a,b,c',d)) <$> k c
{-# INLINE _3 #-}
instance Field3 (a,b,c,d,e) (a,b,c',d,e) c c' where
_3 k (a,b,c,d,e) = (\c' -> (a,b,c',d,e)) <$> k c
{-# INLINE _3 #-}
instance Field3 (a,b,c,d,e,f) (a,b,c',d,e,f) c c' where
_3 k (a,b,c,d,e,f) = (\c' -> (a,b,c',d,e,f)) <$> k c
{-# INLINE _3 #-}
instance Field3 (a,b,c,d,e,f,g) (a,b,c',d,e,f,g) c c' where
_3 k (a,b,c,d,e,f,g) = (\c' -> (a,b,c',d,e,f,g)) <$> k c
{-# INLINE _3 #-}
instance Field3 (a,b,c,d,e,f,g,h) (a,b,c',d,e,f,g,h) c c' where
_3 k (a,b,c,d,e,f,g,h) = (\c' -> (a,b,c',d,e,f,g,h)) <$> k c
{-# INLINE _3 #-}
instance Field3 (a,b,c,d,e,f,g,h,i) (a,b,c',d,e,f,g,h,i) c c' where
_3 k (a,b,c,d,e,f,g,h,i) = (\c' -> (a,b,c',d,e,f,g,h,i)) <$> k c
{-# INLINE _3 #-}
-- | Provide access to the 4th field of a tuple
class Field4 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 4th field of a tuple
_4 :: Lens a b c d
instance Field4 (a,b,c,d) (a,b,c,d') d d' where
_4 k (a,b,c,d) = (\d' -> (a,b,c,d')) <$> k d
{-# INLINE _4 #-}
instance Field4 (a,b,c,d,e) (a,b,c,d',e) d d' where
_4 k (a,b,c,d,e) = (\d' -> (a,b,c,d',e)) <$> k d
{-# INLINE _4 #-}
instance Field4 (a,b,c,d,e,f) (a,b,c,d',e,f) d d' where
_4 k (a,b,c,d,e,f) = (\d' -> (a,b,c,d',e,f)) <$> k d
{-# INLINE _4 #-}
instance Field4 (a,b,c,d,e,f,g) (a,b,c,d',e,f,g) d d' where
_4 k (a,b,c,d,e,f,g) = (\d' -> (a,b,c,d',e,f,g)) <$> k d
{-# INLINE _4 #-}
instance Field4 (a,b,c,d,e,f,g,h) (a,b,c,d',e,f,g,h) d d' where
_4 k (a,b,c,d,e,f,g,h) = (\d' -> (a,b,c,d',e,f,g,h)) <$> k d
{-# INLINE _4 #-}
instance Field4 (a,b,c,d,e,f,g,h,i) (a,b,c,d',e,f,g,h,i) d d' where
_4 k (a,b,c,d,e,f,g,h,i) = (\d' -> (a,b,c,d',e,f,g,h,i)) <$> k d
{-# INLINE _4 #-}
-- | Provides access to the 5th field of a tuple
class Field5 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 5th field of a tuple
_5 :: Lens a b c d
instance Field5 (a,b,c,d,e) (a,b,c,d,e') e e' where
_5 k (a,b,c,d,e) = (\e' -> (a,b,c,d,e')) <$> k e
{-# INLINE _5 #-}
instance Field5 (a,b,c,d,e,f) (a,b,c,d,e',f) e e' where
_5 k (a,b,c,d,e,f) = (\e' -> (a,b,c,d,e',f)) <$> k e
{-# INLINE _5 #-}
instance Field5 (a,b,c,d,e,f,g) (a,b,c,d,e',f,g) e e' where
_5 k (a,b,c,d,e,f,g) = (\e' -> (a,b,c,d,e',f,g)) <$> k e
{-# INLINE _5 #-}
instance Field5 (a,b,c,d,e,f,g,h) (a,b,c,d,e',f,g,h) e e' where
_5 k (a,b,c,d,e,f,g,h) = (\e' -> (a,b,c,d,e',f,g,h)) <$> k e
{-# INLINE _5 #-}
instance Field5 (a,b,c,d,e,f,g,h,i) (a,b,c,d,e',f,g,h,i) e e' where
_5 k (a,b,c,d,e,f,g,h,i) = (\e' -> (a,b,c,d,e',f,g,h,i)) <$> k e
{-# INLINE _5 #-}
-- | Provides access to the 6th element of a tuple
class Field6 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 6th field of a tuple
_6 :: Lens a b c d
instance Field6 (a,b,c,d,e,f) (a,b,c,d,e,f') f f' where
_6 k (a,b,c,d,e,f) = (\f' -> (a,b,c,d,e,f')) <$> k f
{-# INLINE _6 #-}
instance Field6 (a,b,c,d,e,f,g) (a,b,c,d,e,f',g) f f' where
_6 k (a,b,c,d,e,f,g) = (\f' -> (a,b,c,d,e,f',g)) <$> k f
{-# INLINE _6 #-}
instance Field6 (a,b,c,d,e,f,g,h) (a,b,c,d,e,f',g,h) f f' where
_6 k (a,b,c,d,e,f,g,h) = (\f' -> (a,b,c,d,e,f',g,h)) <$> k f
{-# INLINE _6 #-}
instance Field6 (a,b,c,d,e,f,g,h,i) (a,b,c,d,e,f',g,h,i) f f' where
_6 k (a,b,c,d,e,f,g,h,i) = (\f' -> (a,b,c,d,e,f',g,h,i)) <$> k f
{-# INLINE _6 #-}
-- | Provide access to the 7th field of a tuple
class Field7 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 7th field of a tuple
_7 :: Lens a b c d
instance Field7 (a,b,c,d,e,f,g) (a,b,c,d,e,f,g') g g' where
_7 k (a,b,c,d,e,f,g) = (\g' -> (a,b,c,d,e,f,g')) <$> k g
{-# INLINE _7 #-}
instance Field7 (a,b,c,d,e,f,g,h) (a,b,c,d,e,f,g',h) g g' where
_7 k (a,b,c,d,e,f,g,h) = (\g' -> (a,b,c,d,e,f,g',h)) <$> k g
{-# INLINE _7 #-}
instance Field7 (a,b,c,d,e,f,g,h,i) (a,b,c,d,e,f,g',h,i) g g' where
_7 k (a,b,c,d,e,f,g,h,i) = (\g' -> (a,b,c,d,e,f,g',h,i)) <$> k g
{-# INLINE _7 #-}
-- | Provide access to the 8th field of a tuple
class Field8 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 8th field of a tuple
_8 :: Lens a b c d
instance Field8 (a,b,c,d,e,f,g,h) (a,b,c,d,e,f,g,h') h h' where
_8 k (a,b,c,d,e,f,g,h) = (\h' -> (a,b,c,d,e,f,g,h')) <$> k h
{-# INLINE _8 #-}
instance Field8 (a,b,c,d,e,f,g,h,i) (a,b,c,d,e,f,g,h',i) h h' where
_8 k (a,b,c,d,e,f,g,h,i) = (\h' -> (a,b,c,d,e,f,g,h',i)) <$> k h
{-# INLINE _8 #-}
-- | Provides access to the 9th field of a tuple
class Field9 a b c d | a -> c, b -> d, a d -> b, b c -> a where
-- | Access the 9th field of a tuple
_9 :: Lens a b c d
instance Field9 (a,b,c,d,e,f,g,h,i) (a,b,c,d,e,f,g,h,i') i i' where
_9 k (a,b,c,d,e,f,g,h,i) = (\i' -> (a,b,c,d,e,f,g,h,i')) <$> k i
{-# INLINE _9 #-}