Ord.hs

module Data.Derive.Ord where
{-
import Prelude

example :: Sample
instance Ord a => Ord (Sample a) where
    compare a b = check a b
        where
            check (First) (First) = EQ
            check (Second x1 x2) (Second y1 y2) = compare x1 y1 `_then` compare x2 y2 `_then` EQ
            check (Third x1) (Third y1) = compare x1 y1 `_then` EQ
            check x y | length [First{},Second{},Third{}] > 1 = compare (tag x) (tag y)

            -- leading _ to avoid a warning when not used
            EQ `_then` x = x
            x `_then` _ = x

            tag (First{}) = 0 :: Int
            tag (Second{}) = 1 :: Int
            tag (Third{}) = 2 :: Int

-}
-- GENERATED START

import Data.Derive.DSL.DSL
import Data.Derive.Internal.Derivation

makeOrd :: Derivation
makeOrd = derivationDSL "Ord" dslOrd

dslOrd =
    List [Instance ["Ord"] "Ord" (List [App "InsDecl" (List [App
    "FunBind" (List [List [App "Match" (List [App "Ident" (List [
    String "compare"]),List [App "PVar" (List [App "Ident" (List [
    String "a"])]),App "PVar" (List [App "Ident" (List [String "b"])])
    ],App "Nothing" (List []),App "UnGuardedRhs" (List [Application (
    List [App "Var" (List [App "UnQual" (List [App "Ident" (List [
    String "check"])])]),App "Var" (List [App "UnQual" (List [App
    "Ident" (List [String "a"])])]),App "Var" (List [App "UnQual" (
    List [App "Ident" (List [String "b"])])])])]),App "Just" (List [
    App "BDecls" (List [List [App "FunBind" (List [Concat (List [
    MapCtor (App "Match" (List [App "Ident" (List [String "check"]),
    List [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 "PParen" (List [App "PApp" (List [App "UnQual" (List [App
    "Ident" (List [CtorName])]),MapField (App "PVar" (List [App
    "Ident" (List [Concat (List [String "y",ShowInt FieldIndex])])]))]
    )])],App "Nothing" (List []),App "UnGuardedRhs" (List [Fold (App
    "InfixApp" (List [Tail,App "QVarOp" (List [App "UnQual" (List [App
    "Ident" (List [String "_then"])])]),Head])) (Concat (List [List [
    App "Con" (List [App "UnQual" (List [App "Ident" (List [String
    "EQ"])])])],Reverse (MapField (Application (List [App "Var" (List
    [App "UnQual" (List [App "Ident" (List [String "compare"])])]),App
    "Var" (List [App "UnQual" (List [App "Ident" (List [Concat (List [
    String "x",ShowInt FieldIndex])])])]),App "Var" (List [App
    "UnQual" (List [App "Ident" (List [Concat (List [String "y",
    ShowInt FieldIndex])])])])])))]))]),App "Nothing" (List [])])),
    List [App "Match" (List [App "Ident" (List [String "check"]),List
    [App "PVar" (List [App "Ident" (List [String "x"])]),App "PVar" (
    List [App "Ident" (List [String "y"])])],App "Nothing" (List []),
    App "GuardedRhss" (List [List [App "GuardedRhs" (List [List [App
    "Qualifier" (List [App "InfixApp" (List [App "App" (List [App
    "Var" (List [App "UnQual" (List [App "Ident" (List [String
    "length"])])]),App "List" (List [MapCtor (App "RecConstr" (List [
    App "UnQual" (List [App "Ident" (List [CtorName])]),List []]))])])
    ,App "QVarOp" (List [App "UnQual" (List [App "Symbol" (List [
    String ">"])])]),App "Lit" (List [App "Int" (List [Int 1])])])])],
    Application (List [App "Var" (List [App "UnQual" (List [App
    "Ident" (List [String "compare"])])]),App "Paren" (List [App "App"
    (List [App "Var" (List [App "UnQual" (List [App "Ident" (List [
    String "tag"])])]),App "Var" (List [App "UnQual" (List [App
    "Ident" (List [String "x"])])])])]),App "Paren" (List [App "App" (
    List [App "Var" (List [App "UnQual" (List [App "Ident" (List [
    String "tag"])])]),App "Var" (List [App "UnQual" (List [App
    "Ident" (List [String "y"])])])])])])])]]),App "Nothing" (List [])
    ])]])]),App "FunBind" (List [List [App "Match" (List [App "Ident"
    (List [String "_then"]),List [App "PApp" (List [App "UnQual" (List
    [App "Ident" (List [String "EQ"])]),List []]),App "PVar" (List [
    App "Ident" (List [String "x"])])],App "Nothing" (List []),App
    "UnGuardedRhs" (List [App "Var" (List [App "UnQual" (List [App
    "Ident" (List [String "x"])])])]),App "Nothing" (List [])]),App
    "Match" (List [App "Ident" (List [String "_then"]),List [App
    "PVar" (List [App "Ident" (List [String "x"])]),App "PWildCard" (
    List [])],App "Nothing" (List []),App "UnGuardedRhs" (List [App
    "Var" (List [App "UnQual" (List [App "Ident" (List [String "x"])])
    ])]),App "Nothing" (List [])])]]),App "FunBind" (List [MapCtor (
    App "Match" (List [App "Ident" (List [String "tag"]),List [App
    "PParen" (List [App "PRec" (List [App "UnQual" (List [App "Ident"
    (List [CtorName])]),List []])])],App "Nothing" (List []),App
    "UnGuardedRhs" (List [App "ExpTypeSig" (List [App "Lit" (List [App
    "Int" (List [CtorIndex])]),App "TyCon" (List [App "UnQual" (List [
    App "Ident" (List [String "Int"])])])])]),App "Nothing" (List [])]
    ))])]])])])]])])])]
-- GENERATED STOP