module Data.Derive.DataAbstract(makeDataAbstract) where
import Data.Derive.DSL.HSE
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 "Nothing" (List [])])]])]),App "InsDecl" (List [
App "PatBind" (List [App "PVar" (List [App "Ident" (List [String
"gunfold"])]),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 "Nothing" (List [])])]),App "InsDecl" (List [App
"PatBind" (List [App "PVar" (List [App "Ident" (List [String
"toConstr"])]),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 "Nothing" (List [])])]),App "InsDecl" (List [App
"PatBind" (List [App "PVar" (List [App "Ident" (List [String
"dataTypeOf"])]),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 "Nothing" (List [])])])])]
custom = customContext context
context :: FullDataDecl -> Context -> Context
context d _ = [ClassA (qname t) [tyVar x] | x <- dataDeclVars $ snd d, t <- ["Typeable","Data"]]