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{-|
For deriving Data on abstract data types.
-}
module Data.Derive.DataAbstract(makeDataAbstract) where
{-
import Data.Data(Data(..))
example :: Custom
instance Typeable a => Data (Sample a) where
gfoldl k r x = r x
gunfold = error "Data.gunfold not implemented on abstract data type: Sample"
toConstr = error "Data.gunfold not implemented on abstract data type: Sample"
dataTypeOf = error "Data.gunfold not implemented on abstract data type: Sample"
-}
import Data.Derive.DSL.HSE
-- GENERATED START
import Data.Derive.DSL.DSL
import Data.Derive.Internal.Derivation
makeDataAbstract :: Derivation
makeDataAbstract = derivationCustomDSL "DataAbstract" custom $
List [Instance ["Typeable"] "Data" (List [App "InsDecl" (List [App
"FunBind" (List [List [App "Match" (List [App "Ident" (List [
String "gfoldl"]),List [App "PVar" (List [App "Ident" (List [
String "k"])]),App "PVar" (List [App "Ident" (List [String "r"])])
,App "PVar" (List [App "Ident" (List [String "x"])])],App
"Nothing" (List []),App "UnGuardedRhs" (List [App "App" (List [App
"Var" (List [App "UnQual" (List [App "Ident" (List [String "r"])])
]),App "Var" (List [App "UnQual" (List [App "Ident" (List [String
"x"])])])])]),App "BDecls" (List [List []])])]])]),App "InsDecl" (
List [App "PatBind" (List [App "PVar" (List [App "Ident" (List [
String "gunfold"])]),App "Nothing" (List []),App "UnGuardedRhs" (
List [App "App" (List [App "Var" (List [App "UnQual" (List [App
"Ident" (List [String "error"])])]),App "Lit" (List [App "String"
(List [Concat (List [String
"Data.gunfold not implemented on abstract data type: ",DataName])]
)])])]),App "BDecls" (List [List []])])]),App "InsDecl" (List [App
"PatBind" (List [App "PVar" (List [App "Ident" (List [String
"toConstr"])]),App "Nothing" (List []),App "UnGuardedRhs" (List [
App "App" (List [App "Var" (List [App "UnQual" (List [App "Ident"
(List [String "error"])])]),App "Lit" (List [App "String" (List [
Concat (List [String
"Data.gunfold not implemented on abstract data type: ",DataName])]
)])])]),App "BDecls" (List [List []])])]),App "InsDecl" (List [App
"PatBind" (List [App "PVar" (List [App "Ident" (List [String
"dataTypeOf"])]),App "Nothing" (List []),App "UnGuardedRhs" (List
[App "App" (List [App "Var" (List [App "UnQual" (List [App "Ident"
(List [String "error"])])]),App "Lit" (List [App "String" (List [
Concat (List [String
"Data.gunfold not implemented on abstract data type: ",DataName])]
)])])]),App "BDecls" (List [List []])])])])]
-- GENERATED STOP
custom = customContext context
context :: FullDataDecl -> Context -> Context
context d _ = [ClassA (qname t) [tyVar x] | x <- dataDeclVars $ snd d, t <- ["Typeable","Data"]]
|
