th-utilities-0.2.5.0: Collection of useful functions for use with Template Haskell
Safe HaskellSafe-Inferred
LanguageHaskell2010

TH.ReifySimple

Description

Utilities for reifying simplified datatype info. It omits details that aren't usually relevant to generating instances that work with the datatype. This makes it easier to use TH to derive instances.

The "Simple" in the module name refers to the simplicity of the datatypes, not the module itself, which exports quite a few things which are useful in some circumstance or another. I anticipate that the most common uses of this will be the following APIs:

  • Getting info about a data or newtype declaration, via DataType, reifyDataType, and DataCon. This is useful for writing something which generates declarations based on a datatype, one of the most common uses of Template Haskell.
  • Getting nicely structured info about a named type. See TypeInfo and reifyType. This does not yet support reifying typeclasses, primitive type constructors, or type variables (TyVarI).

Currently, this module supports reifying simplified versions of the following Info constructors:

In the future it will hopefully also have support for the remaining Info constructors, ClassI, ClassOpI, PrimTyConI, VarI, and TyVarI.

Synopsis

Reifying simplified type info

reifyType :: Name -> Q TypeInfo Source #

Reifies a Name as a TypeInfo, and calls fail if this doesn't work. Use reify with infoToType if you want to handle the failure case more gracefully.

This does not yet support reifying typeclasses, primitive type constructors, or type variables (TyVarI).

infoToType :: Info -> Q (Maybe TypeInfo) Source #

Convert an Info into a TypeInfo if possible, and otherwise yield Nothing. Needs to run in Q so that

reifyTypeNoDataKinds :: Name -> Q (Maybe TypeInfo) Source #

Reifies type info, but instead of yielding a LiftedDataConInfo, will instead yield Nothing.

infoToTypeNoDataKinds :: Info -> Maybe TypeInfo Source #

Convert an 'Info into a TypeInfo if possible. If it's a data constructor, instead of yielding LiftedDataConInfo, it will instead yield Nothing.

Reifying simplified info for specific declaration varieties

Datatype info

data DataType Source #

Simplified info about a DataD. Omits deriving, strictness, kind info, and whether it's data or newtype.

Constructors

DataType 

Fields

Instances

Instances details
Data DataType Source # 
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Methods

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

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

toConstr :: DataType -> Constr #

dataTypeOf :: DataType -> DataType0 #

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

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

gmapT :: (forall b. Data b => b -> b) -> DataType -> DataType #

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

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

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

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

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

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

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

Generic DataType Source # 
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type Rep DataType :: Type -> Type #

Methods

from :: DataType -> Rep DataType x #

to :: Rep DataType x -> DataType #

Show DataType Source # 
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Eq DataType Source # 
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Ord DataType Source # 
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type Rep DataType Source # 
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type Rep DataType = D1 ('MetaData "DataType" "TH.ReifySimple" "th-utilities-0.2.5.0-K0RNPnbhjz1AzY6uzY221h" 'False) (C1 ('MetaCons "DataType" 'PrefixI 'True) ((S1 ('MetaSel ('Just "dtName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Just "dtTvs") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Name])) :*: (S1 ('MetaSel ('Just "dtCxt") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Cxt) :*: S1 ('MetaSel ('Just "dtCons") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [DataCon]))))

reifyDataType :: Name -> Q DataType Source #

Reify the given data or newtype declaration, and yields its DataType representation.

Data constructor info

data DataCon Source #

Simplified info about a Con. Omits deriving, strictness, and kind info. This is much nicer than consuming Con directly, because it unifies all the constructors into one.

Constructors

DataCon 

Fields

Instances

Instances details
Data DataCon Source # 
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Methods

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

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

toConstr :: DataCon -> Constr #

dataTypeOf :: DataCon -> DataType #

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

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

gmapT :: (forall b. Data b => b -> b) -> DataCon -> DataCon #

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

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

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

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

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

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

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

Generic DataCon Source # 
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type Rep DataCon :: Type -> Type #

Methods

from :: DataCon -> Rep DataCon x #

to :: Rep DataCon x -> DataCon #

Show DataCon Source # 
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Eq DataCon Source # 
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(==) :: DataCon -> DataCon -> Bool #

(/=) :: DataCon -> DataCon -> Bool #

Ord DataCon Source # 
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type Rep DataCon Source # 
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type Rep DataCon = D1 ('MetaData "DataCon" "TH.ReifySimple" "th-utilities-0.2.5.0-K0RNPnbhjz1AzY6uzY221h" 'False) (C1 ('MetaCons "DataCon" 'PrefixI 'True) ((S1 ('MetaSel ('Just "dcName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Just "dcTvs") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Name])) :*: (S1 ('MetaSel ('Just "dcCxt") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Cxt) :*: S1 ('MetaSel ('Just "dcFields") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [(Maybe Name, Type)]))))

reifyDataCon :: Name -> Q DataCon Source #

Reify the given data constructor.

typeToDataCon :: Name -> Type -> DataCon Source #

Creates a DataCon given the Name and Type of a data-constructor. Note that the result the function type is *not* checked to match the provided Name.

Data family info

data DataFamily Source #

Simplified info about a data family. Omits deriving, strictness, and kind info.

Constructors

DataFamily 

Fields

Instances

Instances details
Data DataFamily Source # 
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Methods

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

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

toConstr :: DataFamily -> Constr #

dataTypeOf :: DataFamily -> DataType #

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

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

gmapT :: (forall b. Data b => b -> b) -> DataFamily -> DataFamily #

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

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

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

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

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

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

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

Generic DataFamily Source # 
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Associated Types

type Rep DataFamily :: Type -> Type #

Show DataFamily Source # 
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Eq DataFamily Source # 
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Ord DataFamily Source # 
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type Rep DataFamily Source # 
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type Rep DataFamily = D1 ('MetaData "DataFamily" "TH.ReifySimple" "th-utilities-0.2.5.0-K0RNPnbhjz1AzY6uzY221h" 'False) (C1 ('MetaCons "DataFamily" 'PrefixI 'True) (S1 ('MetaSel ('Just "dfName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: (S1 ('MetaSel ('Just "dfTvs") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Name]) :*: S1 ('MetaSel ('Just "dfInsts") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [DataInst]))))

data DataInst Source #

Simplified info about a data family instance. Omits deriving, strictness, and kind info.

Constructors

DataInst 

Fields

Instances

Instances details
Data DataInst Source # 
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Defined in TH.ReifySimple

Methods

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

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

toConstr :: DataInst -> Constr #

dataTypeOf :: DataInst -> DataType #

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

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

gmapT :: (forall b. Data b => b -> b) -> DataInst -> DataInst #

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

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

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

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

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

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

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

Generic DataInst Source # 
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Associated Types

type Rep DataInst :: Type -> Type #

Methods

from :: DataInst -> Rep DataInst x #

to :: Rep DataInst x -> DataInst #

Show DataInst Source # 
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Eq DataInst Source # 
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Ord DataInst Source # 
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type Rep DataInst Source # 
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type Rep DataInst = D1 ('MetaData "DataInst" "TH.ReifySimple" "th-utilities-0.2.5.0-K0RNPnbhjz1AzY6uzY221h" 'False) (C1 ('MetaCons "DataInst" 'PrefixI 'True) ((S1 ('MetaSel ('Just "diName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Just "diCxt") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Cxt)) :*: (S1 ('MetaSel ('Just "diParams") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Type]) :*: S1 ('MetaSel ('Just "diCons") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [DataCon]))))

reifyDataFamily :: Name -> Q DataFamily Source #

Reify the given data family, and yield its DataFamily representation.

Type family info

data TypeFamily Source #

Simplified info about a type family. Omits kind info and injectivity info.

Constructors

TypeFamily 

Fields

Instances

Instances details
Data TypeFamily Source # 
Instance details

Defined in TH.ReifySimple

Methods

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

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

toConstr :: TypeFamily -> Constr #

dataTypeOf :: TypeFamily -> DataType #

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

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

gmapT :: (forall b. Data b => b -> b) -> TypeFamily -> TypeFamily #

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

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

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

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

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

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

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

Generic TypeFamily Source # 
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Associated Types

type Rep TypeFamily :: Type -> Type #

Show TypeFamily Source # 
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Eq TypeFamily Source # 
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Ord TypeFamily Source # 
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type Rep TypeFamily Source # 
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type Rep TypeFamily = D1 ('MetaData "TypeFamily" "TH.ReifySimple" "th-utilities-0.2.5.0-K0RNPnbhjz1AzY6uzY221h" 'False) (C1 ('MetaCons "TypeFamily" 'PrefixI 'True) (S1 ('MetaSel ('Just "tfName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: (S1 ('MetaSel ('Just "tfTvs") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Name]) :*: S1 ('MetaSel ('Just "tfInsts") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [TypeInst]))))

data TypeInst Source #

Simplified info about a type family instance. Omits nothing.

Constructors

TypeInst 

Fields

Instances

Instances details
Data TypeInst Source # 
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Defined in TH.ReifySimple

Methods

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

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

toConstr :: TypeInst -> Constr #

dataTypeOf :: TypeInst -> DataType #

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

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

gmapT :: (forall b. Data b => b -> b) -> TypeInst -> TypeInst #

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

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

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

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

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

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

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

Generic TypeInst Source # 
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Associated Types

type Rep TypeInst :: Type -> Type #

Methods

from :: TypeInst -> Rep TypeInst x #

to :: Rep TypeInst x -> TypeInst #

Show TypeInst Source # 
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Eq TypeInst Source # 
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Ord TypeInst Source # 
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type Rep TypeInst Source # 
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type Rep TypeInst = D1 ('MetaData "TypeInst" "TH.ReifySimple" "th-utilities-0.2.5.0-K0RNPnbhjz1AzY6uzY221h" 'False) (C1 ('MetaCons "TypeInst" 'PrefixI 'True) (S1 ('MetaSel ('Just "tiName") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: (S1 ('MetaSel ('Just "tiParams") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Type]) :*: S1 ('MetaSel ('Just "tiType") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type))))

reifyTypeFamily :: Name -> Q TypeFamily Source #

Reify the given type family instance declaration, and yields its TypeInst representation.

Other utilities

conToDataCons :: Con -> [DataCon] Source #

Convert a Con to a list of DataCon. The result is a list because GadtC and RecGadtC can define multiple constructors.

reifyDataTypeSubstituted :: Type -> Q DataType Source #

Like reifyDataType, but takes a Type instead of just the Name of the datatype. It expects a normal datatype argument (see typeToNamedCon).