{-# LANGUAGE TemplateHaskell, CPP #-}
module Data.String.QQ (s) where
import GHC.Exts (IsString(..))
import qualified Language.Haskell.TH as TH
import Language.Haskell.TH.Quote
s :: QuasiQuoter
s :: QuasiQuoter
s = ([Char] -> Q Exp)
-> ([Char] -> Q Pat)
-> ([Char] -> Q Type)
-> ([Char] -> Q [Dec])
-> QuasiQuoter
QuasiQuoter ((\[Char]
a -> [|fromString a|]) ([Char] -> Q Exp) -> ([Char] -> [Char]) -> [Char] -> Q Exp
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [Char] -> [Char]
trimLeadingNewline ([Char] -> [Char]) -> ([Char] -> [Char]) -> [Char] -> [Char]
forall b c a. (b -> c) -> (a -> b) -> a -> c
. [Char] -> [Char]
removeCRs)
([Char] -> [Char] -> Q Pat
forall a. HasCallStack => [Char] -> a
error [Char]
"Cannot use q as a pattern")
#if (__GLASGOW_HASKELL__ >= 700)
([Char] -> [Char] -> Q Type
forall a. HasCallStack => [Char] -> a
error [Char]
"Cannot use q as a type")
([Char] -> [Char] -> Q [Dec]
forall a. HasCallStack => [Char] -> a
error [Char]
"Cannot use q as a dec")
#endif
where
removeCRs :: [Char] -> [Char]
removeCRs = (Char -> Bool) -> [Char] -> [Char]
forall a. (a -> Bool) -> [a] -> [a]
filter (Char -> Char -> Bool
forall a. Eq a => a -> a -> Bool
/= Char
'\r')
trimLeadingNewline :: [Char] -> [Char]
trimLeadingNewline (Char
'\n':[Char]
xs) = [Char]
xs
trimLeadingNewline [Char]
xs = [Char]
xs