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{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE DefaultSignatures #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Coalpit where
import Data.List
import GHC.Generics
import Text.Megaparsec
import Text.Megaparsec.Char
import Data.Maybe
import Data.Char
type Parser = Parsec String String
args :: ToArgs a => Modifiers -> a -> String
args m = intercalate " " . toArgs m
data Modifiers = Modifiers { conNameMod :: String -> String
, selNameMod :: String -> String }
defMod :: Modifiers
defMod = Modifiers (map toLower) (("--" ++) . map toLower)
-- Core classes
class ArgParser a where
argParser :: Modifiers -> Parser a
default argParser :: (Generic a, GArgParser (Rep a)) => Modifiers -> Parser a
argParser m = to <$> gArgParser m
class GArgParser f where
gArgParser :: Modifiers -> Parser (f a)
class ToArgs a where
toArgs :: Modifiers -> a -> [String]
default toArgs :: (Generic a, GToArgs (Rep a)) => Modifiers -> a -> [String]
toArgs m a = gToArgs m (from a)
class GToArgs f where
gToArgs :: Modifiers -> f a -> [String]
-- Units
instance GArgParser U1 where
gArgParser _ = pure U1
instance GToArgs U1 where
gToArgs _ U1 = []
-- Products
instance (GArgParser a, GArgParser b) => GArgParser (a :*: b) where
gArgParser m = (:*:) <$> gArgParser m <* space <*> gArgParser m
instance (GToArgs a, GToArgs b) => GToArgs (a :*: b) where
gToArgs m (a :*: b) = gToArgs m a ++ gToArgs m b
-- Sums
instance (Constructor c1, GArgParser f1, GArgParser (f :+: g)) =>
GArgParser ((f :+: g) :+: C1 c1 f1) where
gArgParser m =
L1 <$> gArgParser m
<|>
R1 <$> (string (conNameMod m $ conName (undefined :: C1 c1 f a))
*> space *> gArgParser m)
instance (Constructor c1, GArgParser f1, GArgParser (f :+: g)) =>
GArgParser (C1 c1 f1 :+: (f :+: g)) where
gArgParser m =
L1 <$> (string (conNameMod m $ conName (undefined :: C1 c1 f a))
*> space *> gArgParser m)
<|>
R1 <$> gArgParser m
instance (Constructor c1, Constructor c2, GArgParser f1, GArgParser f2) =>
GArgParser (C1 c1 f1 :+: C1 c2 f2) where
gArgParser m =
L1 <$> (string (conNameMod m $ conName (undefined :: C1 c1 f a))
*> space *> gArgParser m)
<|>
R1 <$> (string (conNameMod m $ conName (undefined :: C1 c2 f a))
*> space *> gArgParser m)
instance (Constructor c1, GToArgs f1, GToArgs (f :+: g)) =>
GToArgs ((f :+: g) :+: C1 c1 f1) where
gToArgs m (L1 x) = gToArgs m x
gToArgs m (R1 x) = conNameMod m (conName x) : gToArgs m x
instance (Constructor c1, GToArgs f1, GToArgs (f :+: g)) =>
GToArgs (C1 c1 f1 :+: (f :+: g)) where
gToArgs m (L1 x) = conNameMod m (conName x) : gToArgs m x
gToArgs m (R1 x) = gToArgs m x
instance (Constructor c1, Constructor c2, GToArgs f1, GToArgs f2) =>
GToArgs (C1 c1 f1 :+: C1 c2 f2) where
gToArgs m (L1 x) = conNameMod m (conName x) : gToArgs m x
gToArgs m (R1 x) = conNameMod m (conName x) : gToArgs m x
-- Record Selectors
instance (GArgParser a, Selector c) => GArgParser (S1 c a) where
gArgParser m = M1 <$> do
let sname = case selName (undefined :: S1 c a f) of
"" -> pure ()
name -> string (selNameMod m name) *> space
sname *> gArgParser m
instance (GToArgs a, Selector c) => GToArgs (S1 c a) where
gToArgs m s@(M1 x) = case selName s of
"" -> gToArgs m x
name -> selNameMod m name : gToArgs m x
-- Optional arguments
instance {-#OVERLAPPING#-}
(ArgParser a, Selector c) => GArgParser (S1 c (Rec0 (Maybe a))) where
gArgParser m = do
case selName (undefined :: S1 c (Rec0 (Maybe a)) f) of
"" -> M1 <$> gArgParser m
name -> do
x <- optional $ string (selNameMod m name) *> space *> argParser m
pure $ M1 $ K1 x
instance {-#OVERLAPPING#-}
(ToArgs a, Selector c) => GToArgs (S1 c (Rec0 (Maybe a))) where
gToArgs m s@(M1 (K1 x)) = case (selName s, x) of
("", _) -> toArgs m x
(_, Nothing) -> []
(name, Just x') -> selNameMod m name : toArgs m x'
-- Constructors
instance (GArgParser a, Constructor c) => GArgParser (C1 c a) where
gArgParser m = M1 <$> gArgParser m
instance (GToArgs a, Constructor c) => GToArgs (C1 c a) where
gToArgs m c@(M1 x) = gToArgs m x
-- Data types
instance (GArgParser a, Datatype c) => GArgParser (D1 c a) where
gArgParser m = M1 <$> gArgParser m
instance (GToArgs a, Datatype c) => GToArgs (D1 c a) where
gToArgs m d@(M1 x) = gToArgs m x
-- Constraints and such
instance (ArgParser a) => GArgParser (K1 i a) where
gArgParser m = K1 <$> argParser m
instance (ToArgs a) => GToArgs (K1 i a) where
gToArgs m (K1 x) = toArgs m x
-- Basic types
instance ArgParser Int where
argParser _ = read <$> some digitChar
instance ToArgs Int where
toArgs _ i = [show i]
instance ArgParser String where
argParser _ = char '"' *> manyTill anyChar (char '"')
instance ToArgs String where
toArgs _ i = [show i]
instance ArgParser Double where
argParser _ = read <$> some (digitChar <|> char '.')
instance ToArgs Double where
toArgs _ i = [show i]
instance ArgParser a => ArgParser (Maybe a)
instance ToArgs a => ToArgs (Maybe a)
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