{-# LANGUAGE CPP #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DeriveTraversable #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE Trustworthy #-}

#ifndef MIN_VERSION_semigroups
#define MIN_VERSION_semigroups(a,b,c) 0
#endif

module Codec.QRCode.Data.Result
  ( Result(..)
  , result
  ) where

import           Control.Applicative
import           Control.Monad
import           Control.Monad.Fix
import           Data.Data
import           Data.Semigroup
import           GHC.Generics
#if !(MIN_VERSION_base(4,8,0))
import           Data.Foldable
import           Data.Traversable
#endif
#if (MIN_VERSION_base(4,9,0))
import           Control.Monad.Zip
import           Data.Functor.Classes
#endif
#if (MIN_VERSION_base(4,9,0)) && !(MIN_VERSION_base(4,13,0))
import           Control.Monad.Fail
#endif

-- | This Maybe wrapper treats Just as success and Nothing as failure.
--   There is no unexpected success \<-> failure change.
--
--   Differences:
--
--   @
--     instance Semigroup/Monoid Maybe where
--        Nothing <> (Just x) = Just x
--        mempty = Nothing
--        stimes 0 (Just x) = Nothing
--
--     instance Semigroup/Monoid Result where
--        Nothing <> (Just x) = Nothing
--        mempty = Just mempty
--        stimes 0 (Just x) = Just (stimes 0 x)
--   @
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liftReadList :: forall a. (Int -> ReadS a) -> ReadS [a] -> ReadS [Result a]
$cliftReadList :: forall a. (Int -> ReadS a) -> ReadS [a] -> ReadS [Result a]
liftReadsPrec :: forall a. (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Result a)
$cliftReadsPrec :: forall a. (Int -> ReadS a) -> ReadS [a] -> Int -> ReadS (Result a)
Read1, forall a.
(Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Result a -> ShowS
forall a.
(Int -> a -> ShowS) -> ([a] -> ShowS) -> [Result a] -> ShowS
forall (f :: * -> *).
(forall a.
 (Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> f a -> ShowS)
-> (forall a.
    (Int -> a -> ShowS) -> ([a] -> ShowS) -> [f a] -> ShowS)
-> Show1 f
liftShowList :: forall a.
(Int -> a -> ShowS) -> ([a] -> ShowS) -> [Result a] -> ShowS
$cliftShowList :: forall a.
(Int -> a -> ShowS) -> ([a] -> ShowS) -> [Result a] -> ShowS
liftShowsPrec :: forall a.
(Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Result a -> ShowS
$cliftShowsPrec :: forall a.
(Int -> a -> ShowS) -> ([a] -> ShowS) -> Int -> Result a -> ShowS
Show1
#endif
    )

instance Semigroup a => Semigroup (Result a) where
  (Result (Just a
a)) <> :: Result a -> Result a -> Result a
<> (Result (Just a
b)) = forall a. Maybe a -> Result a
Result (forall a. a -> Maybe a
Just (a
a forall a. Semigroup a => a -> a -> a
<> a
b))
  Result a
_ <> Result a
_ = forall a. Maybe a -> Result a
Result forall a. Maybe a
Nothing
#if (MIN_VERSION_semigroups(0,17,0)) || (MIN_VERSION_base(4,9,0))
  stimes :: forall b. Integral b => b -> Result a -> Result a
stimes b
n (Result (Just a
a)) = forall a. Maybe a -> Result a
Result (forall a. a -> Maybe a
Just (forall a b. (Semigroup a, Integral b) => b -> a -> a
stimes b
n a
a))
  stimes b
_ Result a
_                 = forall a. Maybe a -> Result a
Result forall a. Maybe a
Nothing
#endif

instance Monoid a => Monoid (Result a) where
  {-# INLINABLE mempty #-}
  mempty :: Result a
mempty = forall a. Maybe a -> Result a
Result (forall a. a -> Maybe a
Just forall a. Monoid a => a
mempty)
#if !(MIN_VERSION_base(4,11,0))
  (Result (Just a)) `mappend` (Result (Just b)) = Result (Just (a `mappend` b))
  _ `mappend` _ = Result Nothing
#endif

result :: b -> (a -> b) -> Result a -> b
{-# INLINE result #-}
result :: forall b a. b -> (a -> b) -> Result a -> b
result b
n a -> b
j (Result Maybe a
m) = forall b a. b -> (a -> b) -> Maybe a -> b
maybe b
n a -> b
j Maybe a
m