cleaned up and documented PGF API

src-3.0/PGF/CId.hs

@@ -2,13 +2,17 @@ module PGF.CId (CId(..), wildCId, mkCId, prCId) where
 
 import Data.ByteString.Char8 as BS
 
+-- | An abstract data type that represents
+-- function identifier in PGF.
 newtype CId = CId BS.ByteString deriving (Eq,Ord,Show)
 
 wildCId :: CId
 wildCId = CId (BS.singleton '_')
 
+-- | Creates a new identifier from 'String'
 mkCId :: String -> CId
 mkCId s = CId (BS.pack s)
 
+-- | Renders the identifier as 'String'
 prCId :: CId -> String
 prCId (CId x) = BS.unpack x