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-- | Source locations
module GF.Infra.Location where
import GF.Text.Pretty
-- ** Source locations
class HasSourcePath a where sourcePath :: a -> FilePath
data Location
= NoLoc
| Local Int Int
| External FilePath Location
deriving (Show,Eq,Ord)
-- | Attaching location information
data L a = L Location a deriving Show
instance Functor L where fmap f (L loc x) = L loc (f x)
unLoc :: L a -> a
unLoc (L _ x) = x
noLoc = L NoLoc
ppLocation :: FilePath -> Location -> Doc
ppLocation fpath NoLoc = pp fpath
ppLocation fpath (External p l) = ppLocation p l
ppLocation fpath (Local b e)
| b == e = fpath <> ":" <> b
| otherwise = fpath <> ":" <> b <> "-" <> e
ppL (L loc x) msg = hang (ppLocation "" loc<>":") 4
("In"<+>x<>":"<+>msg)
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