module Data.Derive.Enum where
import Data.Derive.DSL.DSL
import Data.Derive.Internal.Derivation
makeEnum :: Derivation
makeEnum = derivationDSL "Enum" dslEnum
dslEnum =
List [Instance [] "Enum" (List [App "InsDecl" (List [App "FunBind"
(List [Concat (List [MapCtor (App "Match" (List [App "Ident" (List
[String "toEnum"]),List [App "PLit" (List [App "Signless" (List []
),App "Int" (List [CtorIndex])])],App "Nothing" (List []),App
"UnGuardedRhs" (List [App "RecConstr" (List [App "UnQual" (List [
App "Ident" (List [CtorName])]),List []])]),App "Nothing" (List []
)])),List [App "Match" (List [App "Ident" (List [String "toEnum"])
,List [App "PVar" (List [App "Ident" (List [String "n"])])],App
"Nothing" (List []),App "UnGuardedRhs" (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 "$"])])]),Fold (App "InfixApp" (List [Head,App
"QVarOp" (List [App "UnQual" (List [App "Symbol" (List [String
"++"])])]),Tail])) (List [App "Lit" (List [App "String" (List [
String "toEnum "])]),App "App" (List [App "Var" (List [App
"UnQual" (List [App "Ident" (List [String "show"])])]),App "Var" (
List [App "UnQual" (List [App "Ident" (List [String "n"])])])]),
App "Lit" (List [App "String" (List [String ", not defined for "])
]),App "Lit" (List [App "String" (List [DataName])])])])]),App
"Nothing" (List [])])]])])]),App "InsDecl" (List [App "FunBind" (
List [MapCtor (App "Match" (List [App "Ident" (List [String
"fromEnum"]),List [App "PParen" (List [App "PRec" (List [App
"UnQual" (List [App "Ident" (List [CtorName])]),List []])])],App
"Nothing" (List []),App "UnGuardedRhs" (List [App "Lit" (List [App
"Int" (List [CtorIndex])])]),App "Nothing" (List [])]))])])])]