Safe Haskell | Safe-Inferred |
---|---|
Language | Haskell2010 |
Type-level metadata
This module provides datatypes (to be used promoted) that can represent the metadata of Haskell datatypes on the type level.
We do not reuse the term-level metadata types, because these are GADTs that incorporate additional invariants. We could (at least in GHC 8) impose the same invariants on the type level as well, but some tests have revealed that the resulting type are rather inconvenient to work with.
So we use simple datatypes to represent the type-level metadata, even if this means that some invariants are not explicitly captured.
We establish a relation between the term- and type-level versions of the metadata by automatically computing the term-level version from the type-level version.
As we now have two versions of metadata (term-level and type-level) with very similar, yet slightly different datatype definitions, the names between the modules clash, and this module is recommended to be imported qualified when needed.
The interface exported by this module is still somewhat experimental.
Since: 0.3.0.0
Synopsis
- class DemoteDecidedStrictness (a :: DecidedStrictness) where
- demoteDecidedStrictness :: proxy a -> DecidedStrictness
- class DemoteSourceStrictness (a :: SourceStrictness) where
- demoteSourceStrictness :: proxy a -> SourceStrictness
- class DemoteSourceUnpackedness (a :: SourceUnpackedness) where
- demoteSourceUnpackedness :: proxy a -> SourceUnpackedness
- class DemoteAssociativity (a :: Associativity) where
- demoteAssociativity :: proxy a -> Associativity
- class DemoteFieldInfo (x :: FieldInfo) (a :: Type) where
- demoteFieldInfo :: proxy x -> FieldInfo a
- class SListI xs => DemoteFieldInfos (fs :: [FieldInfo]) (xs :: [Type]) where
- demoteFieldInfos :: proxy fs -> NP FieldInfo xs
- class DemoteStrictnessInfo (s :: StrictnessInfo) (x :: Type) where
- demoteStrictnessInfo :: proxy s -> StrictnessInfo x
- class DemoteStrictnessInfos (ss :: [StrictnessInfo]) (xs :: [Type]) where
- demoteStrictnessInfos :: proxy ss -> NP StrictnessInfo xs
- class DemoteStrictnessInfoss (sss :: [[StrictnessInfo]]) (xss :: [[Type]]) where
- demoteStrictnessInfoss :: proxy sss -> NP (NP StrictnessInfo) xss
- class DemoteConstructorInfo (x :: ConstructorInfo) (xs :: [Type]) where
- demoteConstructorInfo :: proxy x -> ConstructorInfo xs
- class DemoteConstructorInfos (cs :: [ConstructorInfo]) (xss :: [[Type]]) where
- demoteConstructorInfos :: proxy cs -> NP ConstructorInfo xss
- class DemoteDatatypeInfo (x :: DatatypeInfo) (xss :: [[Type]]) where
- demoteDatatypeInfo :: proxy x -> DatatypeInfo xss
- type Fixity = Nat
- type FieldName = Symbol
- type ConstructorName = Symbol
- type ModuleName = Symbol
- type DatatypeName = Symbol
- data FieldInfo = FieldInfo FieldName
- data StrictnessInfo = StrictnessInfo SourceUnpackedness SourceStrictness DecidedStrictness
- data ConstructorInfo
- data DatatypeInfo
- data Associativity
Documentation
class DemoteDecidedStrictness (a :: DecidedStrictness) where Source #
Class for computing term-level decided strictness information from type-level decided strictness information.
Since: 0.4.0.0
demoteDecidedStrictness :: proxy a -> DecidedStrictness Source #
Given a proxy of some type-level source strictness information, return the corresponding term-level information.
Since: 0.4.0.0
Instances
DemoteDecidedStrictness 'DecidedLazy Source # | |
Defined in Generics.SOP.Type.Metadata demoteDecidedStrictness :: proxy 'DecidedLazy -> DecidedStrictness Source # | |
DemoteDecidedStrictness 'DecidedStrict Source # | |
Defined in Generics.SOP.Type.Metadata demoteDecidedStrictness :: proxy 'DecidedStrict -> DecidedStrictness Source # | |
DemoteDecidedStrictness 'DecidedUnpack Source # | |
Defined in Generics.SOP.Type.Metadata demoteDecidedStrictness :: proxy 'DecidedUnpack -> DecidedStrictness Source # |
class DemoteSourceStrictness (a :: SourceStrictness) where Source #
Class for computing term-level source strictness information from type-level source strictness information.
Since: 0.4.0.0
demoteSourceStrictness :: proxy a -> SourceStrictness Source #
Given a proxy of some type-level source strictness information, return the corresponding term-level information.
Since: 0.4.0.0
Instances
DemoteSourceStrictness 'NoSourceStrictness Source # | |
Defined in Generics.SOP.Type.Metadata demoteSourceStrictness :: proxy 'NoSourceStrictness -> SourceStrictness Source # | |
DemoteSourceStrictness 'SourceLazy Source # | |
Defined in Generics.SOP.Type.Metadata demoteSourceStrictness :: proxy 'SourceLazy -> SourceStrictness Source # | |
DemoteSourceStrictness 'SourceStrict Source # | |
Defined in Generics.SOP.Type.Metadata demoteSourceStrictness :: proxy 'SourceStrict -> SourceStrictness Source # |
class DemoteSourceUnpackedness (a :: SourceUnpackedness) where Source #
Class for computing term-level source unpackedness information from type-level source unpackedness information.
Since: 0.4.0.0
demoteSourceUnpackedness :: proxy a -> SourceUnpackedness Source #
Given a proxy of some type-level source unpackedness information, return the corresponding term-level information.
Since: 0.4.0.0
Instances
DemoteSourceUnpackedness 'NoSourceUnpackedness Source # | |
Defined in Generics.SOP.Type.Metadata | |
DemoteSourceUnpackedness 'SourceNoUnpack Source # | |
Defined in Generics.SOP.Type.Metadata demoteSourceUnpackedness :: proxy 'SourceNoUnpack -> SourceUnpackedness Source # | |
DemoteSourceUnpackedness 'SourceUnpack Source # | |
Defined in Generics.SOP.Type.Metadata demoteSourceUnpackedness :: proxy 'SourceUnpack -> SourceUnpackedness Source # |
class DemoteAssociativity (a :: Associativity) where Source #
Class for computing term-level associativity information from type-level associativity information.
Since: 0.3.0.0
demoteAssociativity :: proxy a -> Associativity Source #
Given a proxy of some type-level associativity information, return the corresponding term-level information.
Since: 0.3.0.0
Instances
DemoteAssociativity 'LeftAssociative Source # | |
Defined in Generics.SOP.Type.Metadata demoteAssociativity :: proxy 'LeftAssociative -> Associativity Source # | |
DemoteAssociativity 'NotAssociative Source # | |
Defined in Generics.SOP.Type.Metadata demoteAssociativity :: proxy 'NotAssociative -> Associativity Source # | |
DemoteAssociativity 'RightAssociative Source # | |
Defined in Generics.SOP.Type.Metadata demoteAssociativity :: proxy 'RightAssociative -> Associativity Source # |
class DemoteFieldInfo (x :: FieldInfo) (a :: Type) where Source #
Class for computing term-level field information from type-level field information.
Since: 0.3.0.0
demoteFieldInfo :: proxy x -> FieldInfo a Source #
Given a proxy of some type-level field information, return the corresponding term-level information.
Since: 0.3.0.0
Instances
KnownSymbol s => DemoteFieldInfo ('FieldInfo s) a Source # | |
Defined in Generics.SOP.Type.Metadata demoteFieldInfo :: proxy ('FieldInfo s) -> FieldInfo0 a Source # |
class SListI xs => DemoteFieldInfos (fs :: [FieldInfo]) (xs :: [Type]) where Source #
Class for computing term-level field information from type-level field information.
Since: 0.3.0.0
demoteFieldInfos :: proxy fs -> NP FieldInfo xs Source #
Given a proxy of some type-level field information, return the corresponding term-level information as a product.
Since: 0.3.0.0
Instances
DemoteFieldInfos ('[] :: [FieldInfo]) ('[] :: [Type]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteFieldInfos :: proxy '[] -> NP FieldInfo0 '[] Source # | |
(DemoteFieldInfo f x, DemoteFieldInfos fs xs) => DemoteFieldInfos (f ': fs) (x ': xs) Source # | |
Defined in Generics.SOP.Type.Metadata demoteFieldInfos :: proxy (f ': fs) -> NP FieldInfo (x ': xs) Source # |
class DemoteStrictnessInfo (s :: StrictnessInfo) (x :: Type) where Source #
demoteStrictnessInfo :: proxy s -> StrictnessInfo x Source #
Instances
(DemoteSourceUnpackedness su, DemoteSourceStrictness ss, DemoteDecidedStrictness ds) => DemoteStrictnessInfo ('StrictnessInfo su ss ds) x Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfo :: proxy ('StrictnessInfo su ss ds) -> StrictnessInfo0 x Source # |
class DemoteStrictnessInfos (ss :: [StrictnessInfo]) (xs :: [Type]) where Source #
demoteStrictnessInfos :: proxy ss -> NP StrictnessInfo xs Source #
Instances
DemoteStrictnessInfos ('[] :: [StrictnessInfo]) ('[] :: [Type]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfos :: proxy '[] -> NP StrictnessInfo0 '[] Source # | |
(DemoteStrictnessInfo s x, DemoteStrictnessInfos ss xs) => DemoteStrictnessInfos (s ': ss) (x ': xs) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfos :: proxy (s ': ss) -> NP StrictnessInfo (x ': xs) Source # |
class DemoteStrictnessInfoss (sss :: [[StrictnessInfo]]) (xss :: [[Type]]) where Source #
demoteStrictnessInfoss :: proxy sss -> NP (NP StrictnessInfo) xss Source #
Instances
DemoteStrictnessInfoss ('[] :: [[StrictnessInfo]]) ('[] :: [[Type]]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfoss :: proxy '[] -> NP (NP StrictnessInfo0) '[] Source # | |
(DemoteStrictnessInfos ss xs, DemoteStrictnessInfoss sss xss) => DemoteStrictnessInfoss (ss ': sss) (xs ': xss) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfoss :: proxy (ss ': sss) -> NP (NP StrictnessInfo) (xs ': xss) Source # |
class DemoteConstructorInfo (x :: ConstructorInfo) (xs :: [Type]) where Source #
Class for computing term-level constructor information from type-level constructor information.
Since: 0.3.0.0
demoteConstructorInfo :: proxy x -> ConstructorInfo xs Source #
Given a proxy of some type-level constructor information, return the corresponding term-level information.
Since: 0.3.0.0
Instances
(KnownSymbol s, SListI xs) => DemoteConstructorInfo ('Constructor s) xs Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfo :: proxy ('Constructor s) -> ConstructorInfo xs Source # | |
(KnownSymbol s, DemoteFieldInfos fs xs) => DemoteConstructorInfo ('Record s fs) xs Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfo :: proxy ('Record s fs) -> ConstructorInfo xs Source # | |
(KnownSymbol s, DemoteAssociativity a, KnownNat f) => DemoteConstructorInfo ('Infix s a f) '[y, z] Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfo :: proxy ('Infix s a f) -> ConstructorInfo '[y, z] Source # |
class DemoteConstructorInfos (cs :: [ConstructorInfo]) (xss :: [[Type]]) where Source #
Class for computing term-level constructor information from type-level constructor information.
Since: 0.3.0.0
demoteConstructorInfos :: proxy cs -> NP ConstructorInfo xss Source #
Given a proxy of some type-level constructor information, return the corresponding term-level information as a product.
Since: 0.3.0.0
Instances
DemoteConstructorInfos ('[] :: [ConstructorInfo]) ('[] :: [[Type]]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfos :: proxy '[] -> NP ConstructorInfo0 '[] Source # | |
(DemoteConstructorInfo c xs, DemoteConstructorInfos cs xss) => DemoteConstructorInfos (c ': cs) (xs ': xss) Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfos :: proxy (c ': cs) -> NP ConstructorInfo (xs ': xss) Source # |
class DemoteDatatypeInfo (x :: DatatypeInfo) (xss :: [[Type]]) where Source #
Class for computing term-level datatype information from type-level datatype information.
Since: 0.3.0.0
demoteDatatypeInfo :: proxy x -> DatatypeInfo xss Source #
Given a proxy of some type-level datatype information, return the corresponding term-level information.
Since: 0.3.0.0
Instances
(KnownSymbol m, KnownSymbol d, DemoteConstructorInfo c '[x]) => DemoteDatatypeInfo ('Newtype m d c) '['[x]] Source # | |
Defined in Generics.SOP.Type.Metadata demoteDatatypeInfo :: proxy ('Newtype m d c) -> DatatypeInfo '['[x]] Source # | |
(KnownSymbol m, KnownSymbol d, DemoteConstructorInfos cs xss, DemoteStrictnessInfoss sss xss) => DemoteDatatypeInfo ('ADT m d cs sss) xss Source # | |
Defined in Generics.SOP.Type.Metadata demoteDatatypeInfo :: proxy ('ADT m d cs sss) -> DatatypeInfo xss Source # |
type ConstructorName = Symbol Source #
The name of a data constructor.
type ModuleName = Symbol Source #
The name of a module.
type DatatypeName = Symbol Source #
The name of a datatype.
Metadata for a single record field (to be used promoted).
Since: 0.3.0.0
Instances
DemoteFieldInfos ('[] :: [FieldInfo]) ('[] :: [Type]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteFieldInfos :: proxy '[] -> NP FieldInfo0 '[] Source # | |
(DemoteFieldInfo f x, DemoteFieldInfos fs xs) => DemoteFieldInfos (f ': fs) (x ': xs) Source # | |
Defined in Generics.SOP.Type.Metadata demoteFieldInfos :: proxy (f ': fs) -> NP FieldInfo (x ': xs) Source # |
data StrictnessInfo Source #
Strictness information for a single field (to be used promoted).
Since: 0.4.0.0
Instances
DemoteStrictnessInfos ('[] :: [StrictnessInfo]) ('[] :: [Type]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfos :: proxy '[] -> NP StrictnessInfo0 '[] Source # | |
DemoteStrictnessInfoss ('[] :: [[StrictnessInfo]]) ('[] :: [[Type]]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfoss :: proxy '[] -> NP (NP StrictnessInfo0) '[] Source # | |
(DemoteStrictnessInfo s x, DemoteStrictnessInfos ss xs) => DemoteStrictnessInfos (s ': ss) (x ': xs) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfos :: proxy (s ': ss) -> NP StrictnessInfo (x ': xs) Source # | |
(DemoteStrictnessInfos ss xs, DemoteStrictnessInfoss sss xss) => DemoteStrictnessInfoss (ss ': sss) (xs ': xss) Source # | |
Defined in Generics.SOP.Type.Metadata demoteStrictnessInfoss :: proxy (ss ': sss) -> NP (NP StrictnessInfo) (xs ': xss) Source # |
data ConstructorInfo Source #
Metadata for a single constructors (to be used promoted).
Since: 0.3.0.0
Constructor ConstructorName | Normal constructor |
Infix ConstructorName Associativity Fixity | Infix constructor |
Record ConstructorName [FieldInfo] | Record constructor |
Instances
DemoteConstructorInfos ('[] :: [ConstructorInfo]) ('[] :: [[Type]]) Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfos :: proxy '[] -> NP ConstructorInfo0 '[] Source # | |
(DemoteConstructorInfo c xs, DemoteConstructorInfos cs xss) => DemoteConstructorInfos (c ': cs) (xs ': xss) Source # | |
Defined in Generics.SOP.Type.Metadata demoteConstructorInfos :: proxy (c ': cs) -> NP ConstructorInfo (xs ': xss) Source # |
data DatatypeInfo Source #
Metadata for a datatype (to be used promoted).
A type of kind
contains meta-information about a datatype
that is not contained in its code. This information consists
primarily of the names of the datatype, its constructors, and possibly its
record selectors.DatatypeInfo
The constructor indicates whether the datatype has been declared using newtype
or not.
Since: 0.3.0.0
ADT ModuleName DatatypeName [ConstructorInfo] [[StrictnessInfo]] | Standard algebraic datatype |
Newtype ModuleName DatatypeName ConstructorInfo | Newtype |
re-exports
data Associativity #
Datatype to represent the associativity of a constructor