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| author | Joey Hess <joey@kitenet.net> | 2011-11-07 23:21:22 -0400 |
|---|---|---|
| committer | Joey Hess <joey@kitenet.net> | 2011-11-08 00:17:54 -0400 |
| commit | b11a63a860e8446cf3a4b35a5d8ef76329d5135c (patch) | |
| tree | c8ae0c94d6473a3ccc7b15bdbc72d5b5c6ae96b3 /Types/UUID.hs | |
| parent | fdf988be6d2b3bb931a9eb3dcf3fbb83b1fb8c17 (diff) | |
clean up read/show abuse
Avoid ever using read to parse a non-haskell formatted input string.
show :: Key is arguably still show abuse, but displaying Keys as filenames
is just too useful to give up.
Diffstat (limited to 'Types/UUID.hs')
| -rw-r--r-- | Types/UUID.hs | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/Types/UUID.hs b/Types/UUID.hs index f7232d0b97..767cd0dfe8 100644 --- a/Types/UUID.hs +++ b/Types/UUID.hs @@ -9,13 +9,12 @@ module Types.UUID where -- A UUID is either an arbitrary opaque string, or UUID info may be missing. data UUID = NoUUID | UUID String - deriving (Eq, Ord) + deriving (Eq, Ord, Show) -instance Show UUID where - show (UUID u) = u - show NoUUID = "" +fromUUID :: UUID -> String +fromUUID (UUID u) = u +fromUUID NoUUID = "" -instance Read UUID where - readsPrec _ s - | null s = [(NoUUID, "")] - | otherwise = [(UUID s, "")] +toUUID :: String -> UUID +toUUID [] = NoUUID +toUUID s = UUID s |