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33 lines
836 B
33 lines
836 B
{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE DefaultSignatures #-}
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module Frontend.Parser.Posn where
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import Frontend.Lexer.Tokens
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import Data.Typeable
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data Posn
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= Posn { posnLine :: {-# UNPACK #-} !Int
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, posnColm :: {-# UNPACK #-} !Int
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}
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deriving (Eq, Show, Ord)
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class HasPosn a where
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startPosn :: a -> Posn
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endPosn :: a -> Posn
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span :: (HasPosn b, HasPosn c) => b -> c -> a -> a
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default span :: Typeable a => b -> c -> a -> a
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span _ _ x = error $ "Can't span " ++ show (typeOf x)
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instance HasPosn Token where
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startPosn (Token _ l c) = Posn l c
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endPosn (Token t l c) = Posn l (c + tokSize t)
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instance HasPosn (Posn, Posn, a) where
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startPosn (s, _, _) = s
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endPosn (_, e, _) = e
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span start end (_, _, x) = (startPosn start, endPosn end, x)
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thd :: (a, b, c) -> c
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thd (_, _, z) = z
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