25 lines
535 B
Haskell
25 lines
535 B
Haskell
-- | Metadata -- i.e. source position.
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module Metadata where
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import Data.Generics
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data Meta = Meta {
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metaFile :: Maybe String,
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metaLine :: Int,
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metaColumn :: Int
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}
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deriving (Eq, Typeable, Data)
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emptyMeta :: Meta
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emptyMeta = Meta {
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metaFile = Nothing,
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metaLine = 0,
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metaColumn = 0
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}
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instance Show Meta where
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show m =
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case metaFile m of
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Just s -> s ++ ":" ++ show (metaLine m) ++ ":" ++ show (metaColumn m)
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Nothing -> "no source position"
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