-\begin{code}
---
--- These bindings are highly experimental and subject to change
--- without notice. You've been warned.
---
-module SBP(Tree(Tree),Location(Location),Region(Region),parseFile,prettyPrintTree,coalesceFlatHeadlessNodes)
-where
-
-#if defined(java_HOST_OS)
-import Foreign
-import Foreign.Java
-#define CONCAT(x,y) x/**/y
-#define DEFINE_OBJECT(s,name) \
-data CONCAT(name,_); \
-type name = JObject CONCAT(name,_); \
-foreign import jvm s CONCAT(_,name) :: JClass; \
-instance JType_ CONCAT(name,_) where jClass_ _ = CONCAT(_,name);
-#else
-import Header_Java;
-import Class_HaskellHelper;
-import Class_java_lang_Object;
-import Class_java_lang_Class;
-import Class_java_lang_String;
-import Class_edu_berkeley_sbp_Tree;
-import Header_edu_berkeley_sbp_Tree;
-import JVM_HaskellHelper;
-import Header_HaskellHelper;
-import TypedString;
-import JVMBridge;
-import JavaText;
-import JavaTypes;
-import Data.Int;
-import Invocation;
-#endif
---import Text.PrettyPrint.HughesPJ
-import Text.PrettyPrint.Leijen
-
-data Location = Location Int Int
-data Region = Region Location Location
-
-data Tree = Tree String [Tree] Region
-instance Show Tree
- where
- show t@(Tree _ _ _) = show $ prettyPrintTree $ t
-
-coalesceFlatHeadlessNodes t@(Tree s children r)
- | s==[], flat t = Tree (concat $ map (\(Tree s _ _) -> s) children) [] r
- | otherwise = Tree s (map coalesceFlatHeadlessNodes children) r
- where
- flat (Tree _ children _) = not (any id $ map notFlatComponent children)
- notFlatComponent (Tree _ [] _) = False
- notFlatComponent (Tree _ _ _) = True
-
-fsep = fillSep
-prettyPrintTree (Tree "" [] _) = empty
-prettyPrintTree (Tree s [] _) = text s
-prettyPrintTree (Tree [] children _) = prettyPrintTreeList children
-prettyPrintTree (Tree s children _) = (text (s++":")) <$$> (prettyPrintTreeList children)
-prettyPrintTreeList [] = text "{}"
-prettyPrintTreeList children
- | allsingles children = text $ "\"" ++ (concatMap (\(Tree s _ _) -> s) children) ++ "\""
- | otherwise = hang 2 $
- (text "{")
- <+>
- (group
- ((fsep $ map (group . prettyPrintTree) children)
- <+>
- (text "}")))
-allsingles = all (\(Tree s c _) -> (length s)==1 && (length c)==0)
-
-nullRegion = (Region (Location 0 0) (Location 0 0))
-
-
-
-------------------------------------------------------------------------------
-#if defined(java_HOST_OS)
-foreign import jvm type "edu.berkeley.sbp.Tree" JTree#
-data JTree = JTree JTree#
-foreign import jvm type "java.lang.Object" Object#
-data Object = Object Object#
-foreign import jvm safe "edu.berkeley.sbp.misc.RegressionTests.main" regressionTests :: IO ()
-foreign import jvm safe "HaskellHelper.help" haskellHelper :: JString -> IO JTree
-foreign import jvm safe "HaskellHelper.isNull" isNull :: Object -> IO Bool
-foreign import jvm safe "getHead" getHead :: JTree -> IO Object
-foreign import jvm safe "child" getChild :: JTree -> Int32 -> IO JTree
-foreign import jvm safe "size" size :: JTree -> IO Int32
-foreign import jvm safe "toString" jtoString :: Object -> IO JString
-
-toString o = do isn <- isNull o
- if isn then return ""
- else do str <- jtoString o
- return (unpackJString str)
-
-
-haskify :: JTree -> IO Tree
-haskify t =
- do head <- getHead t
- str <- toString head
- numChildren <- size t
- children <- if numChildren == 0
- then do return []
- else do children <- mapM (\i -> getChild t i)
- $ take (fromIntegral numChildren)
- $ iterate (+1) 0
- h <- mapM haskify children
- return h
- return $ Tree str children nullRegion
-
-parseFile ::
- String -> -- file to be parsed
- IO Tree
-
-parseFile f = do f' <- packJString f
- tree <- haskellHelper f'
- x <- haskify tree
- return x
-
-------------------------------------------------------------------------------
-#else
- -- Why do I need this?
- instance SubJavaClassMarker
- Header_edu_berkeley_sbp_Tree.Class_Jedu_berkeley_sbp_Tree
- Header_HaskellHelper.Class_Jedu_berkeley_sbp_Tree
-
- parseFile ::
- [String] -> -- class path
- String -> -- grammar *.g file
- String -> -- file to be parsed
- IO Tree
-
- parseFile classPath grammarFile inputFile =
- runJVM classPath
- ((do class_JHaskellHelper
- s1 <- new_JString_ArrayJchar $ toJavaString grammarFile
- s2 <- new_JString_ArrayJchar $ toJavaString inputFile
- tree <- main_JHaskellHelper_JString_JString (s1, s2)
- t <- haskifyTree tree
- return t
- ) :: JVM Tree)
-
- haskifyTree t =
- ((do class_JHaskellHelper
- class_JTree
- head <- getHead_JTree t ()
- isNull <- getIsNothing head
- str <- if isNull then (return "") else (toString_JObject ((castTLRef head) :: Jjava_lang_Object) () >>= getStringUTF >>= \x -> return (showUTF8 x))
- numChildren <- size_JTree t()
- children <- if numChildren == 0
- then do return []
- else do children <- mapM (\i -> child_JTree_Jint t ((fromIntegral i)::Int32))
- $ take (fromIntegral numChildren)
- $ iterate (+1) 0
- h <- mapM (\c -> haskifyTree (castTLRef c)) children
- return h
- return $ Tree str children nullRegion
- ) :: JVM Tree)
-
-#endif
-\end{code}
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