tempus-0.1.0: Tempus/Loc.hs

-- | Support for source locations.
module Tempus.Loc (
    SrcLoc,
    showSrcLoc,

    Loc (..),
    unLoc
) where


-- | A source location, where the first value indicates the line and the second the column number
type SrcLoc = (Int, Int)

-- | Converts a source location to a string.
showSrcLoc :: SrcLoc -> String
showSrcLoc (l, c) = concat [show l, ":", show c]

-- | A value together with a source location.
data Loc a = Loc SrcLoc a deriving (Show, Eq)

-- | Unwraps the value and discards the location.
unLoc :: Loc a -> a
unLoc (Loc _ a) = a