moved all old source code to src-2.9 ; src will be for GF 3 development

src-2.9/GF/Printing/PrintParser.hs

@@ -0,0 +1,83 @@
+----------------------------------------------------------------------
+-- |
+-- Module      : PrintParser
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/04/21 16:23:16 $ 
+-- > CVS $Author: bringert $
+-- > CVS $Revision: 1.3 $
+--
+-- Pretty-printing of parser objects
+-----------------------------------------------------------------------------
+
+module GF.Printing.PrintParser (Print(..),
+		    prtBefore, prtAfter, prtSep, 
+		    prtBeforeAfter,
+		    prIO
+		   ) where
+
+-- haskell modules:
+import Data.List (intersperse)
+-- gf modules:
+import GF.Data.Operations (Err(..))
+import GF.Infra.Ident (Ident(..))
+import qualified GF.Canon.PrintGFC as P
+
+------------------------------------------------------------
+
+prtBefore :: Print a => String -> [a] -> String
+prtBefore before = prtBeforeAfter before ""
+
+prtAfter :: Print a => String -> [a] -> String
+prtAfter after = prtBeforeAfter "" after
+
+prtSep :: Print a => String -> [a] -> String
+prtSep sep = concat . intersperse sep . map prt
+
+prtBeforeAfter :: Print a => String -> String -> [a] -> String
+prtBeforeAfter before after as = concat [ before ++ prt a ++ after | a <- as ]
+
+prIO :: Print a => a -> IO ()
+prIO = putStr . prt
+
+class Print a where
+    prt :: a -> String
+    prtList :: [a] -> String
+    prtList as = "[" ++ prtSep "," as ++ "]"
+
+instance Print a => Print [a] where
+    prt = prtList
+
+instance (Print a, Print b) => Print (a, b) where
+    prt (a, b) = "(" ++ prt a ++ "," ++ prt b ++ ")"
+
+instance (Print a, Print b, Print c) => Print (a, b, c) where
+    prt (a, b, c) = "(" ++ prt a ++ "," ++ prt b ++ "," ++ prt c ++ ")"
+
+instance (Print a, Print b, Print c, Print d) => Print (a, b, c, d) where
+    prt (a, b, c, d) = "(" ++ prt a ++ "," ++ prt b ++ "," ++ prt c ++ "," ++ prt d ++ ")"
+
+instance Print Char where
+    prt = return
+    prtList = id
+
+instance Print Int where
+    prt = show
+
+instance Print Integer where
+    prt = show
+
+instance Print a => Print (Maybe a) where
+    prt (Just a) = "!" ++ prt a
+    prt Nothing  = "Nothing"
+
+instance Print a => Print (Err a) where
+    prt (Ok a) = prt a
+    prt (Bad str) = str
+
+instance Print Ident where
+    prt ident = str
+	where str = P.printTree ident
+