Use explicit language extensions & remove extension fields from base.cabal

[ghc-base.git] / codepages / MakeTable.hs

diff --git a/codepages/MakeTable.hs b/codepages/MakeTable.hs
index af123df..e17380b 100644 (file)
--- a/codepages/MakeTable.hs
+++ b/codepages/MakeTable.hs
@@ -1,6 +1,6 @@
-{-- 
+{--
 This is a script to generate the necessary tables to support Windows code page
-encoding/decoding.  
+encoding/decoding.
 
 License: see libraries/base/LICENSE
 
@@ -14,8 +14,7 @@ Currently, this script only supports single-byte encodings, since the lookup
 tables required for the CJK double-byte codepages are too large to be
 statically linked into every executable.  We plan to add support for them once
 GHC is able to produce Windows DLLs.
-
---} 
+--}
 
 module Main where
 
@@ -33,11 +32,22 @@ import Control.Exception(evaluate)
 main :: IO ()
 main = do
     moduleName:outFile:files <- getArgs
-    sbes <- mapM readMapAndIx files
+    let badFiles = -- These fail with an error like
+                   --     MakeTable: Enum.toEnum{Word8}: tag (33088) is outside of bounds (0,255)
+                   -- I have no idea what's going on, so for now we just
+                   -- skip them.
+                   ["CPs/CP932.TXT",
+                    "CPs/CP936.TXT",
+                    "CPs/CP949.TXT",
+                    "CPs/CP950.TXT"]
+    let files' = filter (`notElem` badFiles) files
+    sbes <- mapM readMapAndIx files'
+    putStrLn "Writing output"
     withBinaryFile outFile WriteMode $ flip hPutStr
-        $ unlines $ makeTableFile moduleName files sbes
+        $ unlines $ makeTableFile moduleName files' sbes
   where
     readMapAndIx f = do
+        putStrLn ("Reading " ++ f)
         m <- readMap f
         return (codePageNum f, m)
 
@@ -70,7 +80,7 @@ readCharHex :: String -> Char
 readCharHex s = if c > fromEnum (maxBound :: Word16)
                     then error "Can't handle non-BMP character."
                     else toEnum c
-    where c = readHex' s 
+    where c = readHex' s
 
 
 -------------------------------------------
@@ -90,13 +100,13 @@ makeTableFile moduleName files maps = concat
                 ++ ["    ]"]
     mkTableEntry (i,m) = "    (" ++ show i ++ ", " ++ makeSBE m ++ "    )"
     blockSizeText = ["blockBitSize :: Int", "blockBitSize = " ++ show blockBitSize]
-                    
+
 
 makeSBE :: Map.Map Word8 Char -> String
 makeSBE m = unlines
                 [ "SingleByteCP {"
                 , "     decoderArray = " ++ mkConvArray es
-                , "     , encoderArray = " ++ mkCompactArray (swapMap m) 
+                , "     , encoderArray = " ++ mkCompactArray (swapMap m)
                 , "   }"
                 ]
   where
@@ -167,7 +177,7 @@ mkCompactArray m = unlines [
 
 type CompressState b = (Map.Map Int [b], Map.Map [b] Int)
 -- each entry in the list corresponds to a block of size n.
-compress :: (Bounded a, Enum a, Ord a, Bounded b, Ord b) => Int -> Map.Map a b 
+compress :: (Bounded a, Enum a, Ord a, Bounded b, Ord b) => Int -> Map.Map a b
         -> ([Int], CompressState b)
 compress n ms = runState (mapM lookupOrAdd chunks) (Map.empty, Map.empty)
     where
@@ -190,18 +200,21 @@ compress n ms = runState (mapM lookupOrAdd chunks) (Map.empty, Map.empty)
 -- Static parts of the generated module.
 
 languageDirectives :: [String]
-languageDirectives = ["{-# LANGUAGE MagicHash #-}"]
+languageDirectives = ["{-# LANGUAGE CPP, MagicHash #-}"]
 
 
 firstComment :: [FilePath] -> [String]
 firstComment files = map ("-- " ++) $
     [ "Do not edit this file directly!"
-    , "It was generated by the MakeTable.hs script using the following files:"
+    , "It was generated by the MakeTable.hs script using the files below."
+    , "To regenerate it, run \"make\" in ../../../../codepages/"
+    , ""
+    , "Files:"
     ] ++ map takeFileName files
 
 theImports :: [String]
 theImports = map ("import " ++ )
-    ["GHC.Prim", "GHC.Base", "GHC.Word", "GHC.Num"]
+    ["GHC.Prim", "GHC.Base", "GHC.Word"]
 
 theTypes :: [String]
 theTypes = [ "data ConvArray a = ConvArray Addr#"
@@ -226,7 +239,7 @@ class (Ord a, Enum a, Bounded a, Show a) => Embed a where
 
 instance Embed Word8 where
     mkHex = showHex'
-    
+
 instance Embed Word16 where
     mkHex = repDualByte
 
@@ -241,7 +254,7 @@ showHex' :: Integral a => a -> String
 showHex' s = "\\x" ++ showHex s ""
 
 repDualByte :: Enum c => c -> String
-repDualByte c 
+repDualByte c
     | n >= 2^(16::Int) = error "value is too high!"
     -- NOTE : this assumes little-endian architecture.  But we're only using this on Windows,
     -- so it's probably OK.