Generics.SOP.Metadata

Metadata about what a datatype looks like

In generics-sop, the metadata is completely independent of the main universe. Many generic functions will use this metadata, but other don't, and yet others might need completely different metadata.

This module defines a datatype to represent standard metadata, i.e., names of the datatype, its constructors, and possibly its record selectors. Metadata descriptions are in general GADTs indexed by the code of the datatype they're associated with, so matching on the metadata will reveal information about the shape of the datatype.

Documentation

type Fixity = Int

The fixity of an infix constructor.

type FieldName = String

The name of a field / record selector.

type ConstructorName = String

The name of a data constructor.

type ModuleName = String

The name of a module.

type DatatypeName = String

The name of a datatype.

data FieldInfo :: Type -> Type where

For records, this functor maps the component to its selector name.

Constructors

FieldInfo :: FieldName -> FieldInfo a

Instances

Functor FieldInfo

Defined in Generics.SOP.Metadata

Methods

fmap :: (a -> b) -> FieldInfo a -> FieldInfo b

(<$) :: a -> FieldInfo b -> FieldInfo a

Eq (FieldInfo a)

Defined in Generics.SOP.Metadata

Methods

(==) :: FieldInfo a -> FieldInfo a -> Bool

(/=) :: FieldInfo a -> FieldInfo a -> Bool

Ord (FieldInfo a)

Defined in Generics.SOP.Metadata

Methods

compare :: FieldInfo a -> FieldInfo a -> Ordering

(<) :: FieldInfo a -> FieldInfo a -> Bool

(<=) :: FieldInfo a -> FieldInfo a -> Bool

(>) :: FieldInfo a -> FieldInfo a -> Bool

(>=) :: FieldInfo a -> FieldInfo a -> Bool

max :: FieldInfo a -> FieldInfo a -> FieldInfo a

min :: FieldInfo a -> FieldInfo a -> FieldInfo a

Show (FieldInfo a)

Defined in Generics.SOP.Metadata

Methods

showsPrec :: Int -> FieldInfo a -> ShowS

show :: FieldInfo a -> String

showList :: [FieldInfo a] -> ShowS

data ConstructorInfo :: [Type] -> Type where

Metadata for a single constructors.

This is indexed by the product structure of the constructor components.

Constructors

Constructor :: SListI xs => ConstructorName -> ConstructorInfo xs

Infix :: ConstructorName -> Associativity -> Fixity -> ConstructorInfo '[x, y]

Record :: SListI xs => ConstructorName -> NP FieldInfo xs -> ConstructorInfo xs

Instances

All (Compose Eq FieldInfo) xs => Eq (ConstructorInfo xs)

Defined in Generics.SOP.Metadata

Methods

(==) :: ConstructorInfo xs -> ConstructorInfo xs -> Bool

(/=) :: ConstructorInfo xs -> ConstructorInfo xs -> Bool

(All (Compose Eq FieldInfo) xs, All (Compose Ord FieldInfo) xs) => Ord (ConstructorInfo xs)

Defined in Generics.SOP.Metadata

Methods

compare :: ConstructorInfo xs -> ConstructorInfo xs -> Ordering

(<) :: ConstructorInfo xs -> ConstructorInfo xs -> Bool

(<=) :: ConstructorInfo xs -> ConstructorInfo xs -> Bool

(>) :: ConstructorInfo xs -> ConstructorInfo xs -> Bool

(>=) :: ConstructorInfo xs -> ConstructorInfo xs -> Bool

max :: ConstructorInfo xs -> ConstructorInfo xs -> ConstructorInfo xs

min :: ConstructorInfo xs -> ConstructorInfo xs -> ConstructorInfo xs

All (Compose Show FieldInfo) xs => Show (ConstructorInfo xs)

Defined in Generics.SOP.Metadata

Methods

showsPrec :: Int -> ConstructorInfo xs -> ShowS

show :: ConstructorInfo xs -> String

showList :: [ConstructorInfo xs] -> ShowS

data DatatypeInfo :: [[Type]] -> Type where

Metadata for a datatype.

A value of type DatatypeInfo c contains the information about a datatype that is not contained in Code c. This information consists primarily of the names of the datatype, its constructors, and possibly its record selectors.

The constructor indicates whether the datatype has been declared using newtype or not.

Constructors

ADT :: ModuleName -> DatatypeName -> NP ConstructorInfo xss -> DatatypeInfo xss

Newtype :: ModuleName -> DatatypeName -> ConstructorInfo '[x] -> DatatypeInfo '['[x]]

Instances

All (Compose Eq ConstructorInfo) xs => Eq (DatatypeInfo xs)

Defined in Generics.SOP.Metadata

Methods

(==) :: DatatypeInfo xs -> DatatypeInfo xs -> Bool

(/=) :: DatatypeInfo xs -> DatatypeInfo xs -> Bool

(All (Compose Eq ConstructorInfo) xs, All (Compose Ord ConstructorInfo) xs) => Ord (DatatypeInfo xs)

Defined in Generics.SOP.Metadata

Methods

compare :: DatatypeInfo xs -> DatatypeInfo xs -> Ordering

(<) :: DatatypeInfo xs -> DatatypeInfo xs -> Bool

(<=) :: DatatypeInfo xs -> DatatypeInfo xs -> Bool

(>) :: DatatypeInfo xs -> DatatypeInfo xs -> Bool

(>=) :: DatatypeInfo xs -> DatatypeInfo xs -> Bool

max :: DatatypeInfo xs -> DatatypeInfo xs -> DatatypeInfo xs

min :: DatatypeInfo xs -> DatatypeInfo xs -> DatatypeInfo xs

All (Compose Show ConstructorInfo) xs => Show (DatatypeInfo xs)

Defined in Generics.SOP.Metadata

Methods

showsPrec :: Int -> DatatypeInfo xs -> ShowS

show :: DatatypeInfo xs -> String

showList :: [DatatypeInfo xs] -> ShowS

moduleName :: DatatypeInfo xss -> ModuleName

The module name where a datatype is defined.

Since: generics-sop-0.2.3.0

datatypeName :: DatatypeInfo xss -> DatatypeName

The name of a datatype (or newtype).

Since: generics-sop-0.2.3.0

constructorInfo :: DatatypeInfo xss -> NP ConstructorInfo xss

The constructor info for a datatype (or newtype).

Since: generics-sop-0.2.3.0

constructorName :: ConstructorInfo xs -> ConstructorName

The name of a constructor.

Since: generics-sop-0.2.3.0

fieldName :: FieldInfo a -> FieldName

The name of a field.

Since: generics-sop-0.2.3.0

re-exports

data Associativity

Datatype to represent the associativity of a constructor

Constructors

LeftAssociative

RightAssociative

NotAssociative

Instances

Bounded Associativity

Defined in GHC.Generics

Methods

minBound :: Associativity

maxBound :: Associativity

Enum Associativity

Defined in GHC.Generics

Methods

succ :: Associativity -> Associativity

pred :: Associativity -> Associativity

toEnum :: Int -> Associativity

fromEnum :: Associativity -> Int

enumFrom :: Associativity -> [Associativity]

enumFromThen :: Associativity -> Associativity -> [Associativity]

enumFromTo :: Associativity -> Associativity -> [Associativity]

enumFromThenTo :: Associativity -> Associativity -> Associativity -> [Associativity]

Eq Associativity

Defined in GHC.Generics

Methods

(==) :: Associativity -> Associativity -> Bool

(/=) :: Associativity -> Associativity -> Bool

Data Associativity

Since: base-4.9.0.0

Defined in Data.Data

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> Associativity -> c Associativity

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c Associativity

toConstr :: Associativity -> Constr

dataTypeOf :: Associativity -> DataType

dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c Associativity)

dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c Associativity)

gmapT :: (forall b. Data b => b -> b) -> Associativity -> Associativity

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Associativity -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Associativity -> r

gmapQ :: (forall d. Data d => d -> u) -> Associativity -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> Associativity -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> Associativity -> m Associativity

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Associativity -> m Associativity

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Associativity -> m Associativity

Ord Associativity

Defined in GHC.Generics

Methods

compare :: Associativity -> Associativity -> Ordering

(<) :: Associativity -> Associativity -> Bool

(<=) :: Associativity -> Associativity -> Bool

(>) :: Associativity -> Associativity -> Bool

(>=) :: Associativity -> Associativity -> Bool

max :: Associativity -> Associativity -> Associativity

min :: Associativity -> Associativity -> Associativity

Read Associativity

Defined in GHC.Generics

Methods

readsPrec :: Int -> ReadS Associativity

readList :: ReadS [Associativity]

readPrec :: ReadPrec Associativity

readListPrec :: ReadPrec [Associativity]

Show Associativity

Defined in GHC.Generics

Methods

showsPrec :: Int -> Associativity -> ShowS

show :: Associativity -> String

showList :: [Associativity] -> ShowS

Ix Associativity

Defined in GHC.Generics

Methods

range :: (Associativity, Associativity) -> [Associativity]

index :: (Associativity, Associativity) -> Associativity -> Int

unsafeIndex :: (Associativity, Associativity) -> Associativity -> Int

inRange :: (Associativity, Associativity) -> Associativity -> Bool

rangeSize :: (Associativity, Associativity) -> Int

unsafeRangeSize :: (Associativity, Associativity) -> Int

Generic Associativity

Defined in GHC.Generics

Associated Types

type Rep Associativity :: * -> *

Methods

from :: Associativity -> Rep Associativity x

to :: Rep Associativity x -> Associativity

SingKind Associativity

Since: base-4.0.0.0

Defined in GHC.Generics

Associated Types

type DemoteRep Associativity :: *

Methods

fromSing :: Sing a -> DemoteRep Associativity

HasDatatypeInfo Associativity

Defined in Generics.SOP.Instances

Associated Types

type DatatypeInfoOf Associativity :: DatatypeInfo

Methods

datatypeInfo :: proxy Associativity -> DatatypeInfo (Code Associativity)

Generic Associativity

Defined in Generics.SOP.Instances

Associated Types

type Code Associativity :: [[Type]]

Methods

from :: Associativity -> Rep Associativity

to :: Rep Associativity -> Associativity

SingI LeftAssociative

Since: base-4.9.0.0

Defined in GHC.Generics

Methods

sing :: Sing LeftAssociative

SingI RightAssociative

Since: base-4.9.0.0

Defined in GHC.Generics

Methods

sing :: Sing RightAssociative

SingI NotAssociative

Since: base-4.9.0.0

Defined in GHC.Generics

Methods

sing :: Sing NotAssociative

type Rep Associativity

Defined in GHC.Generics

type Rep Associativity = D1 (MetaData "Associativity" "GHC.Generics" "base" False) (C1 (MetaCons "LeftAssociative" PrefixI False) (U1 :: * -> *) :+: (C1 (MetaCons "RightAssociative" PrefixI False) (U1 :: * -> *) :+: C1 (MetaCons "NotAssociative" PrefixI False) (U1 :: * -> *)))

data Sing (a :: Associativity)

Defined in GHC.Generics

data Sing (a :: Associativity) where

• SLeftAssociative :: Sing LeftAssociative
• SRightAssociative :: Sing RightAssociative
• SNotAssociative :: Sing NotAssociative

type DemoteRep Associativity

Defined in GHC.Generics

type DemoteRep Associativity = Associativity

type DatatypeInfoOf Associativity

Defined in Generics.SOP.Instances

type DatatypeInfoOf Associativity = ADT "GHC.Generics" "Associativity" (Constructor "LeftAssociative" ': (Constructor "RightAssociative" ': (Constructor "NotAssociative" ': ([] :: [ConstructorInfo]))))

type Code Associativity

Defined in Generics.SOP.Instances

type Code Associativity = ([] :: [Type]) ': (([] :: [Type]) ': (([] :: [Type]) ': ([] :: [[Type]])))