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 "Int" (List [
CtorIndex])])],App "Nothing" (List []),App "UnGuardedRhs" (List [
App "RecConstr" (List [App "UnQual" (List [App "Ident" (List [
CtorName])]),List []])]),App "BDecls" (List [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 "BDecls" (
List [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 "BDecls" (List [List []])]))])])])]