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{-# LANGUAGE CPP #-}
module Data.Encoding.Preprocessor.Mapping where
import Distribution.Simple.PreProcess
import Distribution.Simple.Utils
import System.IO
import System.FilePath
import Data.List (intersperse,unfoldr)
import Data.Maybe
import Data.Char
import Data.Word
import Data.Ix
import Data.Bits
import Data.Array.Static.Builder
import Data.CharMap.Builder
data MappingType
= ISOMapping
| JISMapping
deriving (Eq,Ord,Show,Read)
readTranslation :: Int -> FilePath -> IO ([(Integer,Maybe Char)],[String])
readTranslation offset file = do
cont <- fmap parseTranslationTable $ readFile file
let docstr = mapMaybe snd (takeWhile (null.fst) cont)
let trans = mapMaybe (\(ln,comm) -> case drop offset ln of
[src] -> Just (src,Nothing)
[src,trg] -> Just (src,Just $ chr $ fromIntegral trg)
_ -> Nothing) cont
return (trans,docstr)
parseTranslationTable :: String -> [([Integer],Maybe String)]
parseTranslationTable cont = map (\ln -> let (trans,comm) = break (=='#') ln
in (map read (words trans),case comm of
"" -> Nothing
_ -> Just (tail comm))
) (lines cont)
buildDocTable :: [(Integer,Maybe Char)] -> [String]
buildDocTable = intersperse "".
map (\(i,mbc) -> show i ++ (case mbc of
Nothing -> ""
Just c -> "\t = &#"++show (ord c)++"; ("++show (ord c)++")"))
{-fillTranslations :: (Ix a,Show a) => a -> a -> [(a,Maybe Char)] -> [(a,Maybe Char)]
fillTranslations f t = merge (range (f,t))
where
merge xs [] = map (\x -> (x,Nothing)) xs
merge [] cs = error $ "Data.Encoding.Helper.Template.fillTranslations: Character translations out of range: " ++ show cs
merge (x:xs) (y:ys) = if x < fst y
then (x,Nothing):(merge xs (y:ys))
else y:(merge xs ys)-}
fillTranslations :: (Enum a,Eq a) => [(a,Maybe Char)] -> (a,a,[Maybe Char])
fillTranslations [] = error "fillTranslations: zero elements"
fillTranslations ((s,c):rest) = let (e,r) = fill' s rest
fill' cur [] = (cur,[])
fill' cur all@((n,c):rest2) = if succ cur == n
then (let (e',res) = fill' n rest2
in (e',c:res))
else (let (e',res) = fill' (succ cur) all
in (e',Nothing:res))
in (s,e,c:r)
validTranslations :: [(a,Maybe Char)] -> [(a,Char)]
validTranslations = mapMaybe (\(n,mc) -> case mc of
Nothing -> Nothing
Just c -> Just (n,c))
mappingPreprocessor :: PreProcessor
mappingPreprocessor = PreProcessor
{platformIndependent = True
#if MIN_VERSION_Cabal(3,8,0)
,ppOrdering=unsorted
#endif
,runPreProcessor = \(sbase,sfile) (tbase,tfile) verb -> do
let (dir,fn) = splitFileName sfile
let (bname,ext) = splitExtensions fn
let dirs = splitDirectories dir
let tp = case ext of
".mapping" -> ISOMapping
".mapping2" -> JISMapping
info verb (tfile++" generated from mapping "++sfile)
preprocessMapping tp (sbase </> sfile) (tbase </> tfile) dirs bname
}
preprocessMapping :: MappingType -> FilePath -> FilePath -> [String] -> String -> IO ()
preprocessMapping tp src trg mods name = do
(trans,doc) <- readTranslation 0 src
let mod = concat $ intersperse "." (mods++[name])
let wsize = case tp of
ISOMapping -> 1
JISMapping -> 2
let bsize = show (wsize*8) ++ (if wsize > 1 then "be" else "")
--let (larr,off,arr) = staticArray32 trans
let (sarr,earr,els) = fillTranslations trans
{-let (lmp,idx,val) = staticMap wsize trans-}
let arrname = "decoding_array_"++name
let mpname = "encoding_map_"++name
let bcheck exp = if sarr/=0 || earr/=255
then ("(if "++
concat (intersperse "||" $ (if sarr/=0 then ["w<"++show sarr] else [])++(if earr/=255 then ["w>"++show earr] else []))++
" then throwException $ IllegalCharacter $ fromIntegral w else "++exp++")"
) else exp
let mp = buildCharMap (mapMaybe (\(i,c) -> do
rc <- c
return $ SingleMapping
rc
(reverse $ unfoldr (\(w,n) -> if n == 0
then Nothing
else Just (fromIntegral w,(w `shiftR` 8,n-1))) (i,wsize))
) trans
)
{-let mp = case wsize of
1 -> buildStaticMap (mapMaybe (\(i,c) -> case c of
Nothing -> Nothing
Just rc -> Just (rc,fromIntegral i::Word8)) trans)
2 -> buildStaticMap (mapMaybe (\(i,c) -> case c of
Nothing -> Nothing
Just rc -> Just (rc,fromIntegral i::Word16)) trans)-}
writeFile trg $ unlines $
["{- This file has been auto-generated. Do not edit it. -}"
,"{-# LANGUAGE MagicHash,DeriveDataTypeable #-}"
]++(case doc of
[] -> ["{- |"]
_ -> ("{- | "++head doc):(map (\ln -> " "++ln) (tail doc)))
++[""]
++buildDocTable trans
++[" -}"]
++
["module "++mod++"("++name++"(..)) where"
,""
,"import Data.Encoding.Base"
,"import Data.Encoding.ByteSource"
,"import Data.Encoding.ByteSink"
,"import Data.Encoding.Exception"
,"import Data.CharMap"
,"import Data.Array.Static"
,"import Data.Map.Static"
,"import Control.Throws"
,"import Prelude hiding (lookup)"
,"import Data.Word"
,""
,"import Data.Typeable"
,""
,"data "++name++" = "++name
," deriving (Show,Eq,Typeable)"
,""
,arrname++" = "++buildStaticArray (sarr,earr) els
,""
,mpname++" :: CharMap"
,mpname++" = "++mp
,""
,"instance Encoding "++name++" where"
," decodeChar _ = do"
," w <- fetchWord"++bsize
," "++bcheck "return ()"
," case "++arrname++"!w of"
," Nothing -> throwException $ IllegalCharacter $ fromIntegral w"
," Just c -> return c"
," encodeChar _ c = mapEncode c "++mpname
," encodeable _ c = mapMember c "++mpname
]
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