module ASCII.QuasiQuoters ( char, string ) where
import ASCII.Char ( Char )
import ASCII.Superset ( toCharMaybe, toCharListMaybe )
import ASCII.TemplateHaskell ( isCharExp, isCharPat, isStringExp, isStringPat )
import Control.Monad ( (>=>), return )
import Control.Monad.Fail ( MonadFail, fail )
import Data.Maybe ( Maybe (..) )
import Language.Haskell.TH.Quote ( QuasiQuoter (..) )
import Language.Haskell.TH.Syntax ( Q, Exp, Pat )
import qualified Data.Char as Unicode
import qualified Data.String as Unicode
char :: QuasiQuoter
char :: QuasiQuoter
char = (String -> Q Char)
-> (Char -> Q Exp) -> (Char -> Q Pat) -> QuasiQuoter
forall a.
(String -> Q a) -> (a -> Q Exp) -> (a -> Q Pat) -> QuasiQuoter
expPatQQ String -> Q Char
requireOneAscii Char -> Q Exp
isCharExp Char -> Q Pat
isCharPat
string :: QuasiQuoter
string :: QuasiQuoter
string = (String -> Q [Char])
-> ([Char] -> Q Exp) -> ([Char] -> Q Pat) -> QuasiQuoter
forall a.
(String -> Q a) -> (a -> Q Exp) -> (a -> Q Pat) -> QuasiQuoter
expPatQQ String -> Q [Char]
requireAsciiList [Char] -> Q Exp
isStringExp [Char] -> Q Pat
isStringPat
requireOneAscii :: Unicode.String -> Q Char
requireOneAscii :: String -> Q Char
requireOneAscii = String -> Q Char
requireOne (String -> Q Char) -> (Char -> Q Char) -> String -> Q Char
forall (m :: * -> *) a b c.
Monad m =>
(a -> m b) -> (b -> m c) -> a -> m c
>=> Char -> Q Char
requireAscii
oneMaybe :: [a] -> Maybe a
oneMaybe :: [a] -> Maybe a
oneMaybe [a]
xs = case [a]
xs of [a
x] -> a -> Maybe a
forall a. a -> Maybe a
Just a
x; [a]
_ -> Maybe a
forall a. Maybe a
Nothing
requireOne :: Unicode.String -> Q Unicode.Char
requireOne :: String -> Q Char
requireOne = String -> Maybe Char
forall a. [a] -> Maybe a
oneMaybe (String -> Maybe Char) -> String -> String -> Q Char
forall a b. (a -> Maybe b) -> String -> a -> Q b
|| String
"Must be exactly one character."
requireAscii :: Unicode.Char -> Q Char
requireAscii :: Char -> Q Char
requireAscii = Char -> Maybe Char
forall char. CharSuperset char => char -> Maybe Char
toCharMaybe (Char -> Maybe Char) -> String -> Char -> Q Char
forall a b. (a -> Maybe b) -> String -> a -> Q b
|| String
"Must be an ASCII character."
requireAsciiList :: Unicode.String -> Q [Char]
requireAsciiList :: String -> Q [Char]
requireAsciiList = String -> Maybe [Char]
forall string. StringSuperset string => string -> Maybe [Char]
toCharListMaybe (String -> Maybe [Char]) -> String -> String -> Q [Char]
forall a b. (a -> Maybe b) -> String -> a -> Q b
|| String
"Must be only ASCII characters."
(||) :: (a -> Maybe b) -> Unicode.String -> a -> Q b
a -> Maybe b
f || :: (a -> Maybe b) -> String -> a -> Q b
|| String
msg = \a
a -> case a -> Maybe b
f a
a of Just b
b -> b -> Q b
forall (m :: * -> *) a. Monad m => a -> m a
return b
b; Maybe b
Nothing -> String -> Q b
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
msg
expPatQQ :: (Unicode.String -> Q a) -> (a -> Q Exp) -> (a -> Q Pat) -> QuasiQuoter
expPatQQ :: (String -> Q a) -> (a -> Q Exp) -> (a -> Q Pat) -> QuasiQuoter
expPatQQ String -> Q a
f a -> Q Exp
a a -> Q Pat
b =
QuasiQuoter :: (String -> Q Exp)
-> (String -> Q Pat)
-> (String -> Q Type)
-> (String -> Q [Dec])
-> QuasiQuoter
QuasiQuoter
{ quoteExp :: String -> Q Exp
quoteExp = String -> Q a
f (String -> Q a) -> (a -> Q Exp) -> String -> Q Exp
forall (m :: * -> *) a b c.
Monad m =>
(a -> m b) -> (b -> m c) -> a -> m c
>=> a -> Q Exp
a
, quotePat :: String -> Q Pat
quotePat = String -> Q a
f (String -> Q a) -> (a -> Q Pat) -> String -> Q Pat
forall (m :: * -> *) a b c.
Monad m =>
(a -> m b) -> (b -> m c) -> a -> m c
>=> a -> Q Pat
b
, quoteType :: String -> Q Type
quoteType = String -> Q Type
forall (m :: * -> *) a b. MonadFail m => a -> m b
notType
, quoteDec :: String -> Q [Dec]
quoteDec = String -> Q [Dec]
forall (m :: * -> *) a b. MonadFail m => a -> m b
notDec
}
notType :: MonadFail m => a -> m b
notType :: a -> m b
notType a
_ = String -> m b
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"Cannot be used in a type context."
notDec :: MonadFail m => a -> m b
notDec :: a -> m b
notDec a
_ = String -> m b
forall (m :: * -> *) a. MonadFail m => String -> m a
fail String
"Cannot be used in a declaration context."