f997b823dc
Initial commit of the beginnings of a Rain parser (still using the original occam AST) and its test framework, using HUnit
34 lines
915 B
Haskell
34 lines
915 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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import Utils
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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 (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 -> basenamePath s ++ ":" ++ show (metaLine m) ++ ":" ++ show (metaColumn m)
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Nothing -> "no source position"
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--emptyMeta is equal to any meta tag:
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instance Eq Meta where
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(==) a b =
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if ((metaFile a == Nothing) && (metaLine a == 0) && (metaColumn a == 0)) then True else
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if ((metaFile b == Nothing) && (metaLine b == 0) && (metaColumn b == 0)) then True else
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((metaFile a == metaFile b) && (metaLine a == metaLine b) && (metaColumn a == metaColumn b))
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