Copyright | (C) 2014-2017 Ryan Scott |
---|---|
License | BSD-style (see the file LICENSE) |
Maintainer | Ryan Scott |
Stability | Provisional |
Portability | GHC |
Safe Haskell | None |
Language | Haskell2010 |
Generic versions of TextShow
and TextShow1
class functions, as an alternative to
TextShow.TH, which uses Template Haskell. Because there is no Generic2
class, TextShow2
cannot be implemented generically.
This implementation is loosely based off of the Generics.Deriving.Show
module
from the generic-deriving
library.
Since: 2
- genericShowt :: (Generic a, GTextShowT Zero (Rep a)) => a -> Text
- genericShowtl :: (Generic a, GTextShowTL Zero (Rep a)) => a -> Text
- genericShowtPrec :: (Generic a, GTextShowT Zero (Rep a)) => Int -> a -> Text
- genericShowtlPrec :: (Generic a, GTextShowTL Zero (Rep a)) => Int -> a -> Text
- genericShowtList :: (Generic a, GTextShowT Zero (Rep a)) => [a] -> Text
- genericShowtlList :: (Generic a, GTextShowTL Zero (Rep a)) => [a] -> Text
- genericShowb :: (Generic a, GTextShowB Zero (Rep a)) => a -> Builder
- genericShowbPrec :: (Generic a, GTextShowB Zero (Rep a)) => Int -> a -> Builder
- genericShowbList :: (Generic a, GTextShowB Zero (Rep a)) => [a] -> Builder
- genericPrintT :: (Generic a, GTextShowT Zero (Rep a)) => a -> IO ()
- genericPrintTL :: (Generic a, GTextShowTL Zero (Rep a)) => a -> IO ()
- genericHPrintT :: (Generic a, GTextShowT Zero (Rep a)) => Handle -> a -> IO ()
- genericHPrintTL :: (Generic a, GTextShowTL Zero (Rep a)) => Handle -> a -> IO ()
- genericLiftShowbPrec :: (Generic1 f, GTextShowB One (Rep1 f)) => (Int -> a -> Builder) -> ([a] -> Builder) -> Int -> f a -> Builder
- genericShowbPrec1 :: (Generic a, Generic1 f, GTextShowB Zero (Rep a), GTextShowB One (Rep1 f)) => Int -> f a -> Builder
- class GTextShowB arity f where
- class GTextShowConB arity f where
- data ShowFunsB arity a where
- NoShowFunsB :: ShowFunsB Zero a
- Show1FunsB :: (Int -> a -> Builder) -> ([a] -> Builder) -> ShowFunsB One a
- class GTextShowT arity f where
- class GTextShowConT arity f where
- data ShowFunsT arity a where
- NoShowFunsT :: ShowFunsT Zero a
- Show1FunsT :: (Int -> a -> Text) -> ([a] -> Text) -> ShowFunsT One a
- class GTextShowTL arity f where
- class GTextShowConTL arity f where
- data ShowFunsTL arity a where
- NoShowFunsTL :: ShowFunsTL Zero a
- Show1FunsTL :: (Int -> a -> Text) -> ([a] -> Text) -> ShowFunsTL One a
- class IsNullary f where
- data ConType
- data Zero
- data One
Generic show
functions
TextShow
instances can be easily defined for data types that are Generic
instances.
The easiest way to do this is to use the DeriveGeneric
extension.
{-# LANGUAGE DeriveGeneric #-} import GHC.Generics import TextShow import TextShow.Generic data D a = D a deriving (Generic, Generic1) instance TextShow a => TextShow (D a) where showbPrec =genericShowbPrec
instance TextShow1 D where liftShowbPrec =genericLiftShowbPrec
Understanding a compiler error
Suppose you intend to use genericShowbPrec
to define a TextShow
instance.
data Oops = Oops
-- forgot to add "deriving Generic" here!
instance TextShow Oops where
showbPrec = genericShowbPrec
If you forget to add a deriving
clause to your data type, at
compile-time, you might get an error message that begins roughly as follows:Generic
No instance for (GTextShowB
Zero
(Rep Oops))
This error can be confusing, but don't let it intimidate you. The correct fix is
simply to add the missing "deriving
" clause.Generic
Similarly, if the compiler complains about not having an instance for (
, add a "GTextShowB
One
(Rep1 Oops1))deriving
" clause.Generic1
genericShowt :: (Generic a, GTextShowT Zero (Rep a)) => a -> Text Source #
genericShowtl :: (Generic a, GTextShowTL Zero (Rep a)) => a -> Text Source #
genericShowtPrec :: (Generic a, GTextShowT Zero (Rep a)) => Int -> a -> Text Source #
A Generic
implementation of showPrect
.
Since: 2
genericShowtlPrec :: (Generic a, GTextShowTL Zero (Rep a)) => Int -> a -> Text Source #
A Generic
implementation of showtlPrec
.
Since: 2
genericShowtList :: (Generic a, GTextShowT Zero (Rep a)) => [a] -> Text Source #
genericShowtlList :: (Generic a, GTextShowTL Zero (Rep a)) => [a] -> Text Source #
A Generic
implementation of showtlList
.
Since: 2
genericShowb :: (Generic a, GTextShowB Zero (Rep a)) => a -> Builder Source #
genericShowbPrec :: (Generic a, GTextShowB Zero (Rep a)) => Int -> a -> Builder Source #
genericShowbList :: (Generic a, GTextShowB Zero (Rep a)) => [a] -> Builder Source #
genericPrintT :: (Generic a, GTextShowT Zero (Rep a)) => a -> IO () Source #
A Generic
implementation of printT
.
Since: 2
genericPrintTL :: (Generic a, GTextShowTL Zero (Rep a)) => a -> IO () Source #
A Generic
implementation of printTL
.
Since: 2
genericHPrintT :: (Generic a, GTextShowT Zero (Rep a)) => Handle -> a -> IO () Source #
A Generic
implementation of hPrintT
.
Since: 2
genericHPrintTL :: (Generic a, GTextShowTL Zero (Rep a)) => Handle -> a -> IO () Source #
A Generic
implementation of hPrintTL
.
Since: 2
genericLiftShowbPrec :: (Generic1 f, GTextShowB One (Rep1 f)) => (Int -> a -> Builder) -> ([a] -> Builder) -> Int -> f a -> Builder Source #
A Generic1
implementation of genericLiftShowbPrec
.
Since: 2
genericShowbPrec1 :: (Generic a, Generic1 f, GTextShowB Zero (Rep a), GTextShowB One (Rep1 f)) => Int -> f a -> Builder Source #
A 'Generic'/'Generic1' implementation of showbPrec1
.
Since: 2
Internals
Builder
class GTextShowB arity f where Source #
Class of generic representation types that can be converted to a Builder
. The arity
type variable indicates which type class is used.
indicates GTextShowB
Zero
TextShow
behavior, and
indicates GTextShowB
One
TextShow1
behavior. Since: 3.4
gShowbPrec :: ShowFunsB arity a -> Int -> f a -> Builder Source #
This is used as the default generic implementation of showbPrec
(if the arity
is Zero
) or liftShowbPrec
(if the arity
is One
).
GTextShowB One V1 Source # | |
GTextShowB Zero V1 Source # | |
(Constructor Meta c, GTextShowConB arity f, IsNullary * f) => GTextShowB arity (C1 c f) Source # | |
(GTextShowB arity f, GTextShowB arity g) => GTextShowB arity ((:+:) f g) Source # | |
GTextShowB arity f => GTextShowB arity (D1 d f) Source # | |
class GTextShowConB arity f where Source #
Class of generic representation types for which the ConType
has been determined. The arity
type variable indicates which type class is used.
indicates GTextShowConB
Zero
TextShow
behavior, and
indicates GTextShowConB
One
TextShow1
behavior.
GTextShowConB arity UWord Source # | |
GTextShowConB arity UInt Source # | |
GTextShowConB arity UFloat Source # | |
GTextShowConB arity UDouble Source # | |
GTextShowConB arity UChar Source # | |
GTextShowConB arity U1 Source # | |
GTextShowConB One Par1 Source # | |
TextShow1 f => GTextShowConB One (Rec1 f) Source # | |
(GTextShowConB arity f, GTextShowConB arity g) => GTextShowConB arity ((:*:) f g) Source # | |
(Selector Meta s, GTextShowConB arity f) => GTextShowConB arity (S1 s f) Source # | |
TextShow c => GTextShowConB arity (K1 i c) Source # | |
(TextShow1 f, GTextShowConB One g) => GTextShowConB One ((:.:) f g) Source # | |
data ShowFunsB arity a where Source #
A ShowFunsB
value either stores nothing (for TextShow
) or it stores the two function arguments that show occurrences of the type parameter (for TextShow1
). Since: 3.4
NoShowFunsB :: ShowFunsB Zero a | |
Show1FunsB :: (Int -> a -> Builder) -> ([a] -> Builder) -> ShowFunsB One a |
Contravariant (ShowFunsB arity) Source # | |
Strict Text
class GTextShowT arity f where Source #
Class of generic representation types that can be converted to a Text
. The arity
type variable indicates which type class is used.
indicates GTextShowT
Zero
TextShow
behavior, and
indicates GTextShowT
One
TextShow1
behavior. Since: 3.4
gShowtPrec :: ShowFunsT arity a -> Int -> f a -> Text Source #
This is used as the default generic implementation of showtPrec
(if the arity
is Zero
) or liftShowtPrec
(if the arity
is One
).
GTextShowT One V1 Source # | |
GTextShowT Zero V1 Source # | |
(Constructor Meta c, GTextShowConT arity f, IsNullary * f) => GTextShowT arity (C1 c f) Source # | |
(GTextShowT arity f, GTextShowT arity g) => GTextShowT arity ((:+:) f g) Source # | |
GTextShowT arity f => GTextShowT arity (D1 d f) Source # | |
class GTextShowConT arity f where Source #
Class of generic representation types for which the ConType
has been determined. The arity
type variable indicates which type class is used.
indicates GTextShowConT
Zero
TextShow
behavior, and
indicates GTextShowConT
One
TextShow1
behavior.
GTextShowConT arity UWord Source # | |
GTextShowConT arity UInt Source # | |
GTextShowConT arity UFloat Source # | |
GTextShowConT arity UDouble Source # | |
GTextShowConT arity UChar Source # | |
GTextShowConT arity U1 Source # | |
GTextShowConT One Par1 Source # | |
TextShow1 f => GTextShowConT One (Rec1 f) Source # | |
(GTextShowConT arity f, GTextShowConT arity g) => GTextShowConT arity ((:*:) f g) Source # | |
(Selector Meta s, GTextShowConT arity f) => GTextShowConT arity (S1 s f) Source # | |
TextShow c => GTextShowConT arity (K1 i c) Source # | |
(TextShow1 f, GTextShowConT One g) => GTextShowConT One ((:.:) f g) Source # | |
data ShowFunsT arity a where Source #
A ShowFunsT
value either stores nothing (for TextShow
) or it stores the two function arguments that show occurrences of the type parameter (for TextShow1
). Since: 3.4
NoShowFunsT :: ShowFunsT Zero a | |
Show1FunsT :: (Int -> a -> Text) -> ([a] -> Text) -> ShowFunsT One a |
Contravariant (ShowFunsT arity) Source # | |
Lazy Text
class GTextShowTL arity f where Source #
Class of generic representation types that can be converted to a Text
. The arity
type variable indicates which type class is used.
indicates GTextShowTL
Zero
TextShow
behavior, and
indicates GTextShowTL
One
TextShow1
behavior. Since: 3.4
gShowtlPrec :: ShowFunsTL arity a -> Int -> f a -> Text Source #
This is used as the default generic implementation of showtlPrec
(if the arity
is Zero
) or liftShowtlPrec
(if the arity
is One
).
GTextShowTL One V1 Source # | |
GTextShowTL Zero V1 Source # | |
(Constructor Meta c, GTextShowConTL arity f, IsNullary * f) => GTextShowTL arity (C1 c f) Source # | |
(GTextShowTL arity f, GTextShowTL arity g) => GTextShowTL arity ((:+:) f g) Source # | |
GTextShowTL arity f => GTextShowTL arity (D1 d f) Source # | |
class GTextShowConTL arity f where Source #
Class of generic representation types for which the ConType
has been determined. The arity
type variable indicates which type class is used.
indicates GTextShowConTL
Zero
TextShow
behavior, and
indicates GTextShowConTL
One
TextShow1
behavior.
gShowtlPrecCon :: ConType -> ShowFunsTL arity a -> Int -> f a -> Text Source #
GTextShowConTL arity UWord Source # | |
GTextShowConTL arity UInt Source # | |
GTextShowConTL arity UFloat Source # | |
GTextShowConTL arity UDouble Source # | |
GTextShowConTL arity UChar Source # | |
GTextShowConTL arity U1 Source # | |
GTextShowConTL One Par1 Source # | |
TextShow1 f => GTextShowConTL One (Rec1 f) Source # | |
(GTextShowConTL arity f, GTextShowConTL arity g) => GTextShowConTL arity ((:*:) f g) Source # | |
(Selector Meta s, GTextShowConTL arity f) => GTextShowConTL arity (S1 s f) Source # | |
TextShow c => GTextShowConTL arity (K1 i c) Source # | |
(TextShow1 f, GTextShowConTL One g) => GTextShowConTL One ((:.:) f g) Source # | |
data ShowFunsTL arity a where Source #
A ShowFunsTL
value either stores nothing (for TextShow
) or it stores the two function arguments that show occurrences of the type parameter (for TextShow1
). Since: 3.4
NoShowFunsTL :: ShowFunsTL Zero a | |
Show1FunsTL :: (Int -> a -> Text) -> ([a] -> Text) -> ShowFunsTL One a |
Contravariant (ShowFunsTL arity) Source # | |
Other internals
class IsNullary f where Source #
Class of generic representation types that represent a constructor with zero or more fields.
IsNullary * U1 Source # | |
IsNullary * UChar Source # | |
IsNullary * UDouble Source # | |
IsNullary * UFloat Source # | |
IsNullary * UInt Source # | |
IsNullary * UWord Source # | |
IsNullary * (Rec1 f) Source # | |
IsNullary * (K1 i c) Source # | |
IsNullary * ((:*:) f g) Source # | |
IsNullary * ((:.:) f g) Source # | |
IsNullary * f => IsNullary * (S1 s f) Source # | |
IsNullary * Par1 Source # | |
A type-level indicator that TextShow
is being derived generically.
Since: 3.2
A type-level indicator that TextShow1
is being derived generically.
Since: 3.2
GTextShowConTL One Par1 Source # | |
GTextShowTL One V1 Source # | |
GTextShowConT One Par1 Source # | |
GTextShowT One V1 Source # | |
GTextShowConB One Par1 Source # | |
GTextShowB One V1 Source # | |
TextShow1 f => GTextShowConTL One (Rec1 f) Source # | |
TextShow1 f => GTextShowConT One (Rec1 f) Source # | |
TextShow1 f => GTextShowConB One (Rec1 f) Source # | |
(TextShow1 f, GTextShowConTL One g) => GTextShowConTL One ((:.:) f g) Source # | |
(TextShow1 f, GTextShowConT One g) => GTextShowConT One ((:.:) f g) Source # | |
(TextShow1 f, GTextShowConB One g) => GTextShowConB One ((:.:) f g) Source # | |