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|
module Data.Derive.Data(makeData) where
{-
import Data.Data
example :: Custom
instance (Data a, Typeable a) => Data (Sample a) where
gfoldl k r (First) = r First
gfoldl k r (Second x1 x2) = r Second `k` x1 `k` x2
gfoldl k r (Third x1) = r Third `k` x1
gunfold k z c = case constrIndex c - 1 of
0 -> z First
1 -> const k 1 $ const k 2 $ z Second
2 -> const k 1 $ z Third
i -> error $ ("Data.gunfold for Sample" ++ ", unknown index: ") ++ show i
toConstr x@First{} = indexConstr (dataTypeOf x) (0+1)
toConstr x@Second{} = indexConstr (dataTypeOf x) (1+1)
toConstr x@Third{} = indexConstr (dataTypeOf x) (2+1)
dataTypeOf _ = ty
where ty = mkDataType $(dataName)
[mkConstr ty "First" $(ctorFields 0) $(ctorFixity 0)
,mkConstr ty "Second" $(ctorFields 1) $(ctorFixity 1)
,mkConstr ty "Third" $(ctorFields 2) $(ctorFixity 2)]
test :: Computer
instance Data Computer where
gfoldl k r (Laptop x1 x2) = r Laptop `k` x1 `k` x2
gfoldl k r (Desktop x1) = r Desktop `k` x1
gunfold k z c = case constrIndex c - 1 of
0 -> k $ k $ z Laptop
1 -> k $ z Desktop
i -> error $ "Data.gunfold for Computer, unknown index: " ++ show i
toConstr x@Laptop{} = indexConstr (dataTypeOf x) 1
toConstr x@Desktop{} = indexConstr (dataTypeOf x) 2
dataTypeOf _ = ty
where ty = mkDataType "Example.Computer"
[mkConstr ty "Laptop" ["weight", "speed"] Prefix
,mkConstr ty "Desktop" ["speed"] Prefix]
-}
import Data.Derive.DSL.HSE
import qualified Language.Haskell as H
-- GENERATED START
import Data.Derive.DSL.DSL
import Data.Derive.Internal.Derivation
makeData :: Derivation
makeData = derivationCustomDSL "Data" custom $
List [Instance ["Data","Typeable"] "Data" (List [App "InsDecl" (
List [App "FunBind" (List [MapCtor (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 "PParen" (List [App "PApp" (List [App "UnQual" (List [App
"Ident" (List [CtorName])]),MapField (App "PVar" (List [App
"Ident" (List [Concat (List [String "x",ShowInt FieldIndex])])]))]
)])],App "Nothing" (List []),App "UnGuardedRhs" (List [Fold (App
"InfixApp" (List [Tail,App "QVarOp" (List [App "UnQual" (List [App
"Ident" (List [String "k"])])]),Head])) (Concat (List [Reverse (
MapField (App "Var" (List [App "UnQual" (List [App "Ident" (List [
Concat (List [String "x",ShowInt FieldIndex])])])]))),List [App
"App" (List [App "Var" (List [App "UnQual" (List [App "Ident" (
List [String "r"])])]),App "Con" (List [App "UnQual" (List [App
"Ident" (List [CtorName])])])])]]))]),App "BDecls" (List [List []]
)]))])]),App "InsDecl" (List [App "FunBind" (List [List [App
"Match" (List [App "Ident" (List [String "gunfold"]),List [App
"PVar" (List [App "Ident" (List [String "k"])]),App "PVar" (List [
App "Ident" (List [String "z"])]),App "PVar" (List [App "Ident" (
List [String "c"])])],App "Nothing" (List []),App "UnGuardedRhs" (
List [App "Case" (List [App "InfixApp" (List [App "App" (List [App
"Var" (List [App "UnQual" (List [App "Ident" (List [String
"constrIndex"])])]),App "Var" (List [App "UnQual" (List [App
"Ident" (List [String "c"])])])]),App "QVarOp" (List [App "UnQual"
(List [App "Symbol" (List [String "-"])])]),App "Lit" (List [App
"Int" (List [Int 1])])]),Concat (List [MapCtor (App "Alt" (List [
App "PLit" (List [App "Int" (List [CtorIndex])]),App
"UnGuardedAlt" (List [Fold (App "InfixApp" (List [Head,App
"QVarOp" (List [App "UnQual" (List [App "Symbol" (List [String "$"
])])]),Tail])) (Concat (List [MapField (Application (List [App
"Var" (List [App "UnQual" (List [App "Ident" (List [String "const"
])])]),App "Var" (List [App "UnQual" (List [App "Ident" (List [
String "k"])])]),App "Lit" (List [App "Int" (List [FieldIndex])])]
)),List [App "App" (List [App "Var" (List [App "UnQual" (List [App
"Ident" (List [String "z"])])]),App "Con" (List [App "UnQual" (
List [App "Ident" (List [CtorName])])])])]]))]),App "BDecls" (List
[List []])])),List [App "Alt" (List [App "PVar" (List [App "Ident"
(List [String "i"])]),App "UnGuardedAlt" (List [App "InfixApp" (
List [App "Var" (List [App "UnQual" (List [App "Ident" (List [
String "error"])])]),App "QVarOp" (List [App "UnQual" (List [App
"Symbol" (List [String "$"])])]),App "InfixApp" (List [App "Paren"
(List [App "InfixApp" (List [App "Lit" (List [App "String" (List [
Concat (List [String "Data.gunfold for ",DataName])])]),App
"QVarOp" (List [App "UnQual" (List [App "Symbol" (List [String
"++"])])]),App "Lit" (List [App "String" (List [String
", unknown index: "])])])]),App "QVarOp" (List [App "UnQual" (List
[App "Symbol" (List [String "++"])])]),App "App" (List [App "Var"
(List [App "UnQual" (List [App "Ident" (List [String "show"])])]),
App "Var" (List [App "UnQual" (List [App "Ident" (List [String "i"
])])])])])])]),App "BDecls" (List [List []])])]])])]),App "BDecls"
(List [List []])])]])]),App "InsDecl" (List [App "FunBind" (List [
MapCtor (App "Match" (List [App "Ident" (List [String "toConstr"])
,List [App "PAsPat" (List [App "Ident" (List [String "x"]),App
"PRec" (List [App "UnQual" (List [App "Ident" (List [CtorName])]),
List []])])],App "Nothing" (List []),App "UnGuardedRhs" (List [
Application (List [App "Var" (List [App "UnQual" (List [App
"Ident" (List [String "indexConstr"])])]),App "Paren" (List [App
"App" (List [App "Var" (List [App "UnQual" (List [App "Ident" (
List [String "dataTypeOf"])])]),App "Var" (List [App "UnQual" (
List [App "Ident" (List [String "x"])])])])]),App "Paren" (List [
App "InfixApp" (List [App "Lit" (List [App "Int" (List [CtorIndex]
)]),App "QVarOp" (List [App "UnQual" (List [App "Symbol" (List [
String "+"])])]),App "Lit" (List [App "Int" (List [Int 1])])])])])
]),App "BDecls" (List [List []])]))])]),App "InsDecl" (List [App
"FunBind" (List [List [App "Match" (List [App "Ident" (List [
String "dataTypeOf"]),List [App "PWildCard" (List [])],App
"Nothing" (List []),App "UnGuardedRhs" (List [App "Var" (List [App
"UnQual" (List [App "Ident" (List [String "ty"])])])]),App
"BDecls" (List [List [App "PatBind" (List [App "PVar" (List [App
"Ident" (List [String "ty"])]),App "Nothing" (List []),App
"UnGuardedRhs" (List [Application (List [App "Var" (List [App
"UnQual" (List [App "Ident" (List [String "mkDataType"])])]),App
"SpliceExp" (List [App "ParenSplice" (List [App "Var" (List [App
"UnQual" (List [App "Ident" (List [String "dataName"])])])])]),App
"List" (List [MapCtor (Application (List [App "Var" (List [App
"UnQual" (List [App "Ident" (List [String "mkConstr"])])]),App
"Var" (List [App "UnQual" (List [App "Ident" (List [String "ty"])]
)]),App "Lit" (List [App "String" (List [CtorName])]),App
"SpliceExp" (List [App "ParenSplice" (List [App "App" (List [App
"Var" (List [App "UnQual" (List [App "Ident" (List [String
"ctorFields"])])]),App "Lit" (List [App "Int" (List [CtorIndex])])
])])]),App "SpliceExp" (List [App "ParenSplice" (List [App "App" (
List [App "Var" (List [App "UnQual" (List [App "Ident" (List [
String "ctorFixity"])])]),App "Lit" (List [App "Int" (List [
CtorIndex])])])])])]))])])]),App "BDecls" (List [List []])])]])])]
])])])]
-- GENERATED STOP
custom d = customContext context d . customSplice splice d
splice :: FullDataDecl -> Exp -> Exp
splice d x | x ~= "dataName" = H.Lit $ H.String $ prettyPrint (fst d) ++ "." ++ dataDeclName (snd d)
splice d (H.App x (H.Lit (H.Int y)))
| x ~= "ctorFields" = H.List $ [H.Lit $ H.String a | (a,_) <- ctorDeclFields ctor, a /= ""]
| x ~= "ctorFixity" = Con (UnQual (Ident "Prefix"))
where ctor = dataDeclCtors (snd d) !! fromInteger y
context :: FullDataDecl -> Context -> Context
context d _ = [ClassA (qname t) [tyVar x] | x <- dataDeclVars $ snd d, t <- ["Typeable","Data"]]
|
