Support both IO and clean version of Generate monad.

[hs-java.git] / JVM / Common.hs

diff --git a/JVM/Common.hs b/JVM/Common.hs
index 7271e469eabf7cb603af0c54c92125aea4f4c427..301c40c433ea52b7a6e964aec521c088d0eb5589 100644 (file)
--- a/JVM/Common.hs
+++ b/JVM/Common.hs
@@ -1,20 +1,33 @@
 {-# LANGUAGE TypeFamilies, StandaloneDeriving, FlexibleInstances, FlexibleContexts, UndecidableInstances #-}
--- | This module declares `high-level' data types for Java classes, methods etc.
-module JVM.Common where
-
-import Codec.Binary.UTF8.String hiding (encode, decode)
+-- | This module declares some commonly used functions and instances.
+module JVM.Common
+  (toCharList,
+  poolSize,
+  (!),
+  showListIx,
+  byteString
+  ) where
+
+import Codec.Binary.UTF8.String (encodeString, decodeString)
 import Data.Binary
 import Data.Binary.Put
 import qualified Data.ByteString.Lazy as B
+import qualified Data.Map as M
+import Data.Default
 import Data.Char
 import Data.String
-import qualified Data.Map as M
 
 import JVM.ClassFile
 
 instance IsString B.ByteString where
   fromString s = B.pack $ map (fromIntegral . ord) $ encodeString s
 
+instance Default B.ByteString where
+  def = B.empty
+
+instance Default Word16 where
+  def = 0
+
 toCharList :: B.ByteString -> [Int]
 toCharList bstr = map fromIntegral $ B.unpack bstr