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Diffstat (limited to 'third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Classes.hs')
| -rw-r--r-- | third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Classes.hs | 529 |
1 files changed, 0 insertions, 529 deletions
diff --git a/third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Classes.hs b/third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Classes.hs deleted file mode 100644 index bda1749643..0000000000 --- a/third_party/bazel/rules_haskell/examples/transformers/legacy/pre711/Data/Functor/Classes.hs +++ /dev/null @@ -1,529 +0,0 @@ -{-# LANGUAGE CPP #-} -#if __GLASGOW_HASKELL__ >= 702 -{-# LANGUAGE Safe #-} -#endif -#if __GLASGOW_HASKELL__ >= 708 -{-# LANGUAGE DeriveDataTypeable #-} -{-# LANGUAGE StandaloneDeriving #-} -#endif ------------------------------------------------------------------------------ --- | --- Module : Data.Functor.Classes --- Copyright : (c) Ross Paterson 2013 --- License : BSD-style (see the file LICENSE) --- --- Maintainer : R.Paterson@city.ac.uk --- Stability : experimental --- Portability : portable --- --- Liftings of the Prelude classes 'Eq', 'Ord', 'Read' and 'Show' to --- unary and binary type constructors. --- --- These classes are needed to express the constraints on arguments of --- transformers in portable Haskell. Thus for a new transformer @T@, --- one might write instances like --- --- > instance (Eq1 f) => Eq1 (T f) where ... --- > instance (Ord1 f) => Ord1 (T f) where ... --- > instance (Read1 f) => Read1 (T f) where ... --- > instance (Show1 f) => Show1 (T f) where ... --- --- If these instances can be defined, defining instances of the base --- classes is mechanical: --- --- > instance (Eq1 f, Eq a) => Eq (T f a) where (==) = eq1 --- > instance (Ord1 f, Ord a) => Ord (T f a) where compare = compare1 --- > instance (Read1 f, Read a) => Read (T f a) where readsPrec = readsPrec1 --- > instance (Show1 f, Show a) => Show (T f a) where showsPrec = showsPrec1 --- ------------------------------------------------------------------------------ - -module Data.Functor.Classes ( - -- * Liftings of Prelude classes - -- ** For unary constructors - Eq1(..), eq1, - Ord1(..), compare1, - Read1(..), readsPrec1, - Show1(..), showsPrec1, - -- ** For binary constructors - Eq2(..), eq2, - Ord2(..), compare2, - Read2(..), readsPrec2, - Show2(..), showsPrec2, - -- * Helper functions - -- $example - readsData, - readsUnaryWith, - readsBinaryWith, - showsUnaryWith, - showsBinaryWith, - -- ** Obsolete helpers - readsUnary, - readsUnary1, - readsBinary1, - showsUnary, - showsUnary1, - showsBinary1, - ) where - -import Control.Applicative (Const(Const)) -import Data.Functor.Identity (Identity(Identity)) -import Data.Monoid (mappend) -#if MIN_VERSION_base(4,7,0) -import Data.Proxy (Proxy(Proxy)) -#endif -#if __GLASGOW_HASKELL__ >= 708 -import Data.Typeable -#endif -import Text.Show (showListWith) - --- | Lifting of the 'Eq' class to unary type constructors. -class Eq1 f where - -- | Lift an equality test through the type constructor. - -- - -- The function will usually be applied to an equality function, - -- but the more general type ensures that the implementation uses - -- it to compare elements of the first container with elements of - -- the second. - liftEq :: (a -> b -> Bool) -> f a -> f b -> Bool - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Eq1 -#endif - --- | Lift the standard @('==')@ function through the type constructor. -eq1 :: (Eq1 f, Eq a) => f a -> f a -> Bool -eq1 = liftEq (==) - --- | Lifting of the 'Ord' class to unary type constructors. -class (Eq1 f) => Ord1 f where - -- | Lift a 'compare' function through the type constructor. - -- - -- The function will usually be applied to a comparison function, - -- but the more general type ensures that the implementation uses - -- it to compare elements of the first container with elements of - -- the second. - liftCompare :: (a -> b -> Ordering) -> f a -> f b -> Ordering - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Ord1 -#endif - --- | Lift the standard 'compare' function through the type constructor. -compare1 :: (Ord1 f, Ord a) => f a -> f a -> Ordering -compare1 = liftCompare compare - --- | Lifting of the 'Read' class to unary type constructors. -class Read1 f where - -- | 'readsPrec' function for an application of the type constructor - -- based on 'readsPrec' and 'readList' functions for the argument type. - liftReadsPrec :: (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (f a) - - -- | 'readList' function for an application of the type constructor - -- based on 'readsPrec' and 'readList' functions for the argument type. - -- The default implementation using standard list syntax is correct - -- for most types. - liftReadList :: (Int -> ReadS a) -> ReadS [a] -> ReadS [f a] - liftReadList rp rl = readListWith (liftReadsPrec rp rl 0) - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Read1 -#endif - --- | Read a list (using square brackets and commas), given a function --- for reading elements. -readListWith :: ReadS a -> ReadS [a] -readListWith rp = - readParen False (\r -> [pr | ("[",s) <- lex r, pr <- readl s]) - where - readl s = [([],t) | ("]",t) <- lex s] ++ - [(x:xs,u) | (x,t) <- rp s, (xs,u) <- readl' t] - readl' s = [([],t) | ("]",t) <- lex s] ++ - [(x:xs,v) | (",",t) <- lex s, (x,u) <- rp t, (xs,v) <- readl' u] - --- | Lift the standard 'readsPrec' and 'readList' functions through the --- type constructor. -readsPrec1 :: (Read1 f, Read a) => Int -> ReadS (f a) -readsPrec1 = liftReadsPrec readsPrec readList - --- | Lifting of the 'Show' class to unary type constructors. -class Show1 f where - -- | 'showsPrec' function for an application of the type constructor - -- based on 'showsPrec' and 'showList' functions for the argument type. - liftShowsPrec :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> - Int -> f a -> ShowS - - -- | 'showList' function for an application of the type constructor - -- based on 'showsPrec' and 'showList' functions for the argument type. - -- The default implementation using standard list syntax is correct - -- for most types. - liftShowList :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> - [f a] -> ShowS - liftShowList sp sl = showListWith (liftShowsPrec sp sl 0) - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Show1 -#endif - --- | Lift the standard 'showsPrec' and 'showList' functions through the --- type constructor. -showsPrec1 :: (Show1 f, Show a) => Int -> f a -> ShowS -showsPrec1 = liftShowsPrec showsPrec showList - --- | Lifting of the 'Eq' class to binary type constructors. -class Eq2 f where - -- | Lift equality tests through the type constructor. - -- - -- The function will usually be applied to equality functions, - -- but the more general type ensures that the implementation uses - -- them to compare elements of the first container with elements of - -- the second. - liftEq2 :: (a -> b -> Bool) -> (c -> d -> Bool) -> f a c -> f b d -> Bool - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Eq2 -#endif - --- | Lift the standard @('==')@ function through the type constructor. -eq2 :: (Eq2 f, Eq a, Eq b) => f a b -> f a b -> Bool -eq2 = liftEq2 (==) (==) - --- | Lifting of the 'Ord' class to binary type constructors. -class (Eq2 f) => Ord2 f where - -- | Lift 'compare' functions through the type constructor. - -- - -- The function will usually be applied to comparison functions, - -- but the more general type ensures that the implementation uses - -- them to compare elements of the first container with elements of - -- the second. - liftCompare2 :: (a -> b -> Ordering) -> (c -> d -> Ordering) -> - f a c -> f b d -> Ordering - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Ord2 -#endif - --- | Lift the standard 'compare' function through the type constructor. -compare2 :: (Ord2 f, Ord a, Ord b) => f a b -> f a b -> Ordering -compare2 = liftCompare2 compare compare - --- | Lifting of the 'Read' class to binary type constructors. -class Read2 f where - -- | 'readsPrec' function for an application of the type constructor - -- based on 'readsPrec' and 'readList' functions for the argument types. - liftReadsPrec2 :: (Int -> ReadS a) -> ReadS [a] -> - (Int -> ReadS b) -> ReadS [b] -> Int -> ReadS (f a b) - - -- | 'readList' function for an application of the type constructor - -- based on 'readsPrec' and 'readList' functions for the argument types. - -- The default implementation using standard list syntax is correct - -- for most types. - liftReadList2 :: (Int -> ReadS a) -> ReadS [a] -> - (Int -> ReadS b) -> ReadS [b] -> ReadS [f a b] - liftReadList2 rp1 rl1 rp2 rl2 = - readListWith (liftReadsPrec2 rp1 rl1 rp2 rl2 0) - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Read2 -#endif - --- | Lift the standard 'readsPrec' function through the type constructor. -readsPrec2 :: (Read2 f, Read a, Read b) => Int -> ReadS (f a b) -readsPrec2 = liftReadsPrec2 readsPrec readList readsPrec readList - --- | Lifting of the 'Show' class to binary type constructors. -class Show2 f where - -- | 'showsPrec' function for an application of the type constructor - -- based on 'showsPrec' and 'showList' functions for the argument types. - liftShowsPrec2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> - (Int -> b -> ShowS) -> ([b] -> ShowS) -> Int -> f a b -> ShowS - - -- | 'showList' function for an application of the type constructor - -- based on 'showsPrec' and 'showList' functions for the argument types. - -- The default implementation using standard list syntax is correct - -- for most types. - liftShowList2 :: (Int -> a -> ShowS) -> ([a] -> ShowS) -> - (Int -> b -> ShowS) -> ([b] -> ShowS) -> [f a b] -> ShowS - liftShowList2 sp1 sl1 sp2 sl2 = - showListWith (liftShowsPrec2 sp1 sl1 sp2 sl2 0) - -#if __GLASGOW_HASKELL__ >= 708 -deriving instance Typeable Show2 -#endif - --- | Lift the standard 'showsPrec' function through the type constructor. -showsPrec2 :: (Show2 f, Show a, Show b) => Int -> f a b -> ShowS -showsPrec2 = liftShowsPrec2 showsPrec showList showsPrec showList - --- Instances for Prelude type constructors - -instance Eq1 Maybe where - liftEq _ Nothing Nothing = True - liftEq _ Nothing (Just _) = False - liftEq _ (Just _) Nothing = False - liftEq eq (Just x) (Just y) = eq x y - -instance Ord1 Maybe where - liftCompare _ Nothing Nothing = EQ - liftCompare _ Nothing (Just _) = LT - liftCompare _ (Just _) Nothing = GT - liftCompare comp (Just x) (Just y) = comp x y - -instance Read1 Maybe where - liftReadsPrec rp _ d = - readParen False (\ r -> [(Nothing,s) | ("Nothing",s) <- lex r]) - `mappend` - readsData (readsUnaryWith rp "Just" Just) d - -instance Show1 Maybe where - liftShowsPrec _ _ _ Nothing = showString "Nothing" - liftShowsPrec sp _ d (Just x) = showsUnaryWith sp "Just" d x - -instance Eq1 [] where - liftEq _ [] [] = True - liftEq _ [] (_:_) = False - liftEq _ (_:_) [] = False - liftEq eq (x:xs) (y:ys) = eq x y && liftEq eq xs ys - -instance Ord1 [] where - liftCompare _ [] [] = EQ - liftCompare _ [] (_:_) = LT - liftCompare _ (_:_) [] = GT - liftCompare comp (x:xs) (y:ys) = comp x y `mappend` liftCompare comp xs ys - -instance Read1 [] where - liftReadsPrec _ rl _ = rl - -instance Show1 [] where - liftShowsPrec _ sl _ = sl - -instance Eq2 (,) where - liftEq2 e1 e2 (x1, y1) (x2, y2) = e1 x1 x2 && e2 y1 y2 - -instance Ord2 (,) where - liftCompare2 comp1 comp2 (x1, y1) (x2, y2) = - comp1 x1 x2 `mappend` comp2 y1 y2 - -instance Read2 (,) where - liftReadsPrec2 rp1 _ rp2 _ _ = readParen False $ \ r -> - [((x,y), w) | ("(",s) <- lex r, - (x,t) <- rp1 0 s, - (",",u) <- lex t, - (y,v) <- rp2 0 u, - (")",w) <- lex v] - -instance Show2 (,) where - liftShowsPrec2 sp1 _ sp2 _ _ (x, y) = - showChar '(' . sp1 0 x . showChar ',' . sp2 0 y . showChar ')' - -instance (Eq a) => Eq1 ((,) a) where - liftEq = liftEq2 (==) - -instance (Ord a) => Ord1 ((,) a) where - liftCompare = liftCompare2 compare - -instance (Read a) => Read1 ((,) a) where - liftReadsPrec = liftReadsPrec2 readsPrec readList - -instance (Show a) => Show1 ((,) a) where - liftShowsPrec = liftShowsPrec2 showsPrec showList - -instance Eq2 Either where - liftEq2 e1 _ (Left x) (Left y) = e1 x y - liftEq2 _ _ (Left _) (Right _) = False - liftEq2 _ _ (Right _) (Left _) = False - liftEq2 _ e2 (Right x) (Right y) = e2 x y - -instance Ord2 Either where - liftCompare2 comp1 _ (Left x) (Left y) = comp1 x y - liftCompare2 _ _ (Left _) (Right _) = LT - liftCompare2 _ _ (Right _) (Left _) = GT - liftCompare2 _ comp2 (Right x) (Right y) = comp2 x y - -instance Read2 Either where - liftReadsPrec2 rp1 _ rp2 _ = readsData $ - readsUnaryWith rp1 "Left" Left `mappend` - readsUnaryWith rp2 "Right" Right - -instance Show2 Either where - liftShowsPrec2 sp1 _ _ _ d (Left x) = showsUnaryWith sp1 "Left" d x - liftShowsPrec2 _ _ sp2 _ d (Right x) = showsUnaryWith sp2 "Right" d x - -instance (Eq a) => Eq1 (Either a) where - liftEq = liftEq2 (==) - -instance (Ord a) => Ord1 (Either a) where - liftCompare = liftCompare2 compare - -instance (Read a) => Read1 (Either a) where - liftReadsPrec = liftReadsPrec2 readsPrec readList - -instance (Show a) => Show1 (Either a) where - liftShowsPrec = liftShowsPrec2 showsPrec showList - -#if MIN_VERSION_base(4,7,0) -instance Eq1 Proxy where - liftEq _ _ _ = True - -instance Ord1 Proxy where - liftCompare _ _ _ = EQ - -instance Show1 Proxy where - liftShowsPrec _ _ _ _ = showString "Proxy" - -instance Read1 Proxy where - liftReadsPrec _ _ d = - readParen (d > 10) (\r -> [(Proxy, s) | ("Proxy",s) <- lex r ]) -#endif - --- Instances for other functors defined in the base package - -instance Eq1 Identity where - liftEq eq (Identity x) (Identity y) = eq x y - -instance Ord1 Identity where - liftCompare comp (Identity x) (Identity y) = comp x y - -instance Read1 Identity where - liftReadsPrec rp _ = readsData $ - readsUnaryWith rp "Identity" Identity - -instance Show1 Identity where - liftShowsPrec sp _ d (Identity x) = showsUnaryWith sp "Identity" d x - -instance Eq2 Const where - liftEq2 eq _ (Const x) (Const y) = eq x y - -instance Ord2 Const where - liftCompare2 comp _ (Const x) (Const y) = comp x y - -instance Read2 Const where - liftReadsPrec2 rp _ _ _ = readsData $ - readsUnaryWith rp "Const" Const - -instance Show2 Const where - liftShowsPrec2 sp _ _ _ d (Const x) = showsUnaryWith sp "Const" d x - -instance (Eq a) => Eq1 (Const a) where - liftEq = liftEq2 (==) -instance (Ord a) => Ord1 (Const a) where - liftCompare = liftCompare2 compare -instance (Read a) => Read1 (Const a) where - liftReadsPrec = liftReadsPrec2 readsPrec readList -instance (Show a) => Show1 (Const a) where - liftShowsPrec = liftShowsPrec2 showsPrec showList - --- Building blocks - --- | @'readsData' p d@ is a parser for datatypes where each alternative --- begins with a data constructor. It parses the constructor and --- passes it to @p@. Parsers for various constructors can be constructed --- with 'readsUnary', 'readsUnary1' and 'readsBinary1', and combined with --- @mappend@ from the @Monoid@ class. -readsData :: (String -> ReadS a) -> Int -> ReadS a -readsData reader d = - readParen (d > 10) $ \ r -> [res | (kw,s) <- lex r, res <- reader kw s] - --- | @'readsUnaryWith' rp n c n'@ matches the name of a unary data constructor --- and then parses its argument using @rp@. -readsUnaryWith :: (Int -> ReadS a) -> String -> (a -> t) -> String -> ReadS t -readsUnaryWith rp name cons kw s = - [(cons x,t) | kw == name, (x,t) <- rp 11 s] - --- | @'readsBinaryWith' rp1 rp2 n c n'@ matches the name of a binary --- data constructor and then parses its arguments using @rp1@ and @rp2@ --- respectively. -readsBinaryWith :: (Int -> ReadS a) -> (Int -> ReadS b) -> - String -> (a -> b -> t) -> String -> ReadS t -readsBinaryWith rp1 rp2 name cons kw s = - [(cons x y,u) | kw == name, (x,t) <- rp1 11 s, (y,u) <- rp2 11 t] - --- | @'showsUnaryWith' sp n d x@ produces the string representation of a --- unary data constructor with name @n@ and argument @x@, in precedence --- context @d@. -showsUnaryWith :: (Int -> a -> ShowS) -> String -> Int -> a -> ShowS -showsUnaryWith sp name d x = showParen (d > 10) $ - showString name . showChar ' ' . sp 11 x - --- | @'showsBinaryWith' sp1 sp2 n d x y@ produces the string --- representation of a binary data constructor with name @n@ and arguments --- @x@ and @y@, in precedence context @d@. -showsBinaryWith :: (Int -> a -> ShowS) -> (Int -> b -> ShowS) -> - String -> Int -> a -> b -> ShowS -showsBinaryWith sp1 sp2 name d x y = showParen (d > 10) $ - showString name . showChar ' ' . sp1 11 x . showChar ' ' . sp2 11 y - --- Obsolete building blocks - --- | @'readsUnary' n c n'@ matches the name of a unary data constructor --- and then parses its argument using 'readsPrec'. -{-# DEPRECATED readsUnary "Use readsUnaryWith to define liftReadsPrec" #-} -readsUnary :: (Read a) => String -> (a -> t) -> String -> ReadS t -readsUnary name cons kw s = - [(cons x,t) | kw == name, (x,t) <- readsPrec 11 s] - --- | @'readsUnary1' n c n'@ matches the name of a unary data constructor --- and then parses its argument using 'readsPrec1'. -{-# DEPRECATED readsUnary1 "Use readsUnaryWith to define liftReadsPrec" #-} -readsUnary1 :: (Read1 f, Read a) => String -> (f a -> t) -> String -> ReadS t -readsUnary1 name cons kw s = - [(cons x,t) | kw == name, (x,t) <- readsPrec1 11 s] - --- | @'readsBinary1' n c n'@ matches the name of a binary data constructor --- and then parses its arguments using 'readsPrec1'. -{-# DEPRECATED readsBinary1 "Use readsBinaryWith to define liftReadsPrec" #-} -readsBinary1 :: (Read1 f, Read1 g, Read a) => - String -> (f a -> g a -> t) -> String -> ReadS t -readsBinary1 name cons kw s = - [(cons x y,u) | kw == name, - (x,t) <- readsPrec1 11 s, (y,u) <- readsPrec1 11 t] - --- | @'showsUnary' n d x@ produces the string representation of a unary data --- constructor with name @n@ and argument @x@, in precedence context @d@. -{-# DEPRECATED showsUnary "Use showsUnaryWith to define liftShowsPrec" #-} -showsUnary :: (Show a) => String -> Int -> a -> ShowS -showsUnary name d x = showParen (d > 10) $ - showString name . showChar ' ' . showsPrec 11 x - --- | @'showsUnary1' n d x@ produces the string representation of a unary data --- constructor with name @n@ and argument @x@, in precedence context @d@. -{-# DEPRECATED showsUnary1 "Use showsUnaryWith to define liftShowsPrec" #-} -showsUnary1 :: (Show1 f, Show a) => String -> Int -> f a -> ShowS -showsUnary1 name d x = showParen (d > 10) $ - showString name . showChar ' ' . showsPrec1 11 x - --- | @'showsBinary1' n d x y@ produces the string representation of a binary --- data constructor with name @n@ and arguments @x@ and @y@, in precedence --- context @d@. -{-# DEPRECATED showsBinary1 "Use showsBinaryWith to define liftShowsPrec" #-} -showsBinary1 :: (Show1 f, Show1 g, Show a) => - String -> Int -> f a -> g a -> ShowS -showsBinary1 name d x y = showParen (d > 10) $ - showString name . showChar ' ' . showsPrec1 11 x . - showChar ' ' . showsPrec1 11 y - -{- $example -These functions can be used to assemble 'Read' and 'Show' instances for -new algebraic types. For example, given the definition - -> data T f a = Zero a | One (f a) | Two a (f a) - -a standard 'Read1' instance may be defined as - -> instance (Read1 f) => Read1 (T f) where -> liftReadsPrec rp rl = readsData $ -> readsUnaryWith rp "Zero" Zero `mappend` -> readsUnaryWith (liftReadsPrec rp rl) "One" One `mappend` -> readsBinaryWith rp (liftReadsPrec rp rl) "Two" Two - -and the corresponding 'Show1' instance as - -> instance (Show1 f) => Show1 (T f) where -> liftShowsPrec sp _ d (Zero x) = -> showsUnaryWith sp "Zero" d x -> liftShowsPrec sp sl d (One x) = -> showsUnaryWith (liftShowsPrec sp sl) "One" d x -> liftShowsPrec sp sl d (Two x y) = -> showsBinaryWith sp (liftShowsPrec sp sl) "Two" d x y - --} |