Buffers for scanning string input stored in external arrays.
\begin{code}
-{-# OPTIONS -fno-prune-tydecls #-}
+
module StringBuffer
(
StringBuffer,
- -- creation
- hGetStringBuffer, -- :: FilePath -> IO StringBuffer
+ -- creation/destruction
+ hGetStringBuffer, -- :: FilePath -> IO StringBuffer
+ stringToStringBuffer, -- :: String -> IO StringBuffer
+ freeStringBuffer, -- :: StringBuffer -> IO ()
-- Lookup
currentChar, -- :: StringBuffer -> Char
stepOnBy#, -- :: StringBuffer -> Int# -> StringBuffer
stepOnTo#, -- :: StringBuffer -> Int# -> StringBuffer
stepOnUntil, -- :: (Char -> Bool) -> StringBuffer -> StringBuffer
+ stepOnUntilChar#, -- :: StringBuffer -> Char# -> StringBuffer
stepOverLexeme, -- :: StringBuffer -> StringBuffer
scanNumLit, -- :: Int -> StringBuffer -> (Int, StringBuffer)
squeezeLexeme, -- :: StringBuffer -> Int# -> StringBuffer
-- matching
prefixMatch, -- :: StringBuffer -> String -> Bool
untilEndOfString#, -- :: StringBuffer -> Int#
- untilChar#, -- :: StringBuffer -> Char# -> Int#
-- conversion
lexemeToString, -- :: StringBuffer -> String
#include "HsVersions.h"
import GlaExts
-import Addr ( Addr(..) )
+#if __GLASGOW_HASKELL__ < 411
+import PrelAddr ( Addr(..) )
+#else
+import Addr ( Addr(..) )
+#endif
import Foreign
-import ST
import Char ( chr )
+import Panic ( panic )
-- urk!
-#include "../lib/std/cbits/error.h"
+#include "../lib/std/cbits/stgerror.h"
#if __GLASGOW_HASKELL__ >= 303
-import IO ( openFile, slurpFile )
+import IO ( openFile
+#if __GLASGOW_HASKELL__ < 407
+ , slurpFile -- comes from PrelHandle or IOExts now
+#endif
+ )
import PrelIOBase
import PrelHandle
import Addr
import IO ( openFile, hFileSize, hClose, IOMode(..) )
import Addr
#endif
+#if __GLASGOW_HASKELL__ >= 411
+import Ptr ( Ptr(..) )
+#endif
#if __GLASGOW_HASKELL__ < 301
-import IOBase ( IOError(..), IOErrorType(..) )
+import IOBase ( Handle, IOError(..), IOErrorType(..),
+ constructErrorAndFail )
import IOHandle ( readHandle, writeHandle, filePtr )
import PackBase ( unpackCStringBA )
#else
\end{code}
\begin{code}
-instance Text StringBuffer where
+instance Show StringBuffer where
showsPrec _ s = showString ""
\end{code}
hGetStringBuffer expand_tabs fname = do
(a, read) <- if expand_tabs
then slurpFileExpandTabs fname
+#if __GLASGOW_HASKELL__ < 411
else slurpFile fname
+#else
+ else do
+ (Ptr a#, read) <- slurpFile fname
+ return (A# a#, read)
+#endif
let (A# a#) = a; (I# read#) = read
\end{code}
-----------------------------------------------------------------------------
+-- Turn a String into a StringBuffer
+
+\begin{code}
+stringToStringBuffer :: String -> IO StringBuffer
+freeStringBuffer :: StringBuffer -> IO ()
+
+#if __GLASGOW_HASKELL__ >= 411
+stringToStringBuffer str =
+ do let sz@(I# sz#) = length str + 1
+ (Ptr a#) <- mallocBytes sz
+ fill_in str (A# a#)
+ writeCharOffAddr (A# a#) (sz-1) '\0' -- sentinel
+ return (StringBuffer a# sz# 0# 0#)
+ where
+ fill_in [] _ = return ()
+ fill_in (c:cs) a = do
+ writeCharOffAddr a 0 c
+ fill_in cs (a `plusAddr` 1)
+
+freeStringBuffer (StringBuffer a# _ _ _) = Foreign.free (Ptr a#)
+#else
+stringToStringBuffer = panic "stringToStringBuffer: not implemented"
+freeStringBuffer sb = return ()
+#endif
+
+\end{code}
+
+-----------------------------------------------------------------------------
This very disturbing bit of code is used for expanding the tabs in a
file before we start parsing it. Expanding the tabs early makes the
lexer a lot simpler: we only have to record the beginning of the line
\begin{code}
#if __GLASGOW_HASKELL__ < 303
-ioError = fail
mayBlock fo thing = thing
writeCharOffAddr :: Addr -> Int -> Char -> IO ()
(\ handle ->
do sz <- hFileSize handle
if sz > toInteger (maxBound::Int)
- then ioError (userError "slurpFile: file too big")
+ then IOERROR (userError "slurpFile: file too big")
else do
let sz_i = fromInteger sz
sz_i' = (sz_i * 12) `div` 10 -- add 20% for tabs
trySlurp :: Handle -> Int -> Addr -> IO (Addr, Int)
trySlurp handle sz_i chunk =
-#if __GLASGOW_HASKELL__ >= 303
+#if __GLASGOW_HASKELL__ == 303
+ wantReadableHandle "hGetChar" handle >>= \ handle_ ->
+ let fo = haFO__ handle_ in
+#elif __GLASGOW_HASKELL__ > 303
wantReadableHandle "hGetChar" handle $ \ handle_ ->
let fo = haFO__ handle_ in
#else
tAB_SIZE = 8#
- slurpFile :: Int# -> Int# -> Addr -> Int# -> Int# -> IO Int
+ slurpFile :: Int# -> Int# -> Addr -> Int# -> Int# -> IO (Addr, Int)
slurpFile c off chunk chunk_sz max_off = slurp c off
where
- slurp :: Int# -> Int# -> IO Int
+ slurp :: Int# -> Int# -> IO (Addr, Int)
slurp c off | off >=# max_off = do
let new_sz = chunk_sz *# 2#
chunk' <- reAllocMem chunk (I# new_sz)
- slurpFile c off chunk' new_sz (new_sz -# tAB_SIZE)
+ slurpFile c off chunk' new_sz (new_sz -# (tAB_SIZE +# 1#))
slurp c off = do
intc <- mayBlock fo (_ccall_ fileGetc fo)
if intc == ((-1)::Int)
then do errtype <- getErrType
if errtype == (ERR_EOF :: Int)
- then return (I# off)
+ then return (chunk, I# off)
else constructErrorAndFail "slurpFile"
else case chr intc of
'\t' -> tabIt c off
| otherwise = c +# 1#
slurp c' (off +# 1#)
- tabIt :: Int# -> Int# -> IO Int
+ tabIt :: Int# -> Int# -> IO (Addr, Int)
-- can't run out of buffer in here, because we reserved an
-- extra tAB_SIZE bytes at the end earlier.
tabIt c off = do
in do
-- allow space for a full tab at the end of the buffer
- -- (that's what the max_off thing is for)
- rc <- slurpFile 0# 0# chunk chunk_sz (chunk_sz -# tAB_SIZE)
+ -- (that's what the max_off thing is for),
+ -- and add 1 to allow room for the final sentinel \NUL at
+ -- the end of the file.
+ (chunk', rc) <- slurpFile 0# 0# chunk chunk_sz (chunk_sz -# (tAB_SIZE +# 1#))
+#if __GLASGOW_HASKELL__ < 404
writeHandle handle handle_
+#endif
if rc < (0::Int)
then constructErrorAndFail "slurpFile"
- else return (chunk, rc)
+ else return (chunk', rc+1 {-room for sentinel-})
reAllocMem :: Addr -> Int -> IO Addr
reAllocMem ptr sz = do
chunk <- _ccall_ realloc ptr sz
if chunk == nullAddr
-#if __GLASGOW_HASKELL__ < 303
- then fail (userError "reAllocMem")
-#else
+#if __GLASGOW_HASKELL__ >= 400
then fail "reAllocMem"
+#else
+ then fail (userError "reAllocMem")
#endif
else return chunk
allocMem :: Int -> IO Addr
allocMem sz = do
-#if __GLASGOW_HASKELL__ < 303
chunk <- _ccall_ malloc sz
+#if __GLASGOW_HASKELL__ < 303
if chunk == nullAddr
then fail (userError "allocMem")
else return chunk
#else
- chunk <- _ccall_ allocMemory__ sz
if chunk == nullAddr
then constructErrorAndFail "allocMem"
else return chunk
| otherwise -> (acc,StringBuffer fo l# s# c#)
-expandUntilMatch :: StringBuffer -> String -> StringBuffer
+expandUntilMatch :: StringBuffer -> String -> Maybe StringBuffer
expandUntilMatch (StringBuffer fo l# s# c#) str =
loop c# str
where
- loop c# [] = StringBuffer fo l# s# c#
- loop c# ((C# x#):xs)
- | indexCharOffAddr# fo c# `eqChar#` x#
- = loop (c# +# 1#) xs
- | otherwise
- = loop (c# +# 1#) str
+ loop c# [] = Just (StringBuffer fo l# s# c#)
+ loop c# ((C# x#):xs) =
+ case indexCharOffAddr# fo c# of
+ ch# | ch# `eqChar#` '\NUL'# && c# >=# l# -> Nothing
+ | ch# `eqChar#` x# -> loop (c# +# 1#) xs
+ | otherwise -> loop (c# +# 1#) str
\end{code}
_ -> loop (c# +# 1#)
-untilChar# :: StringBuffer -> Char# -> StringBuffer
-untilChar# (StringBuffer fo l# s# c#) x# =
+stepOnUntilChar# :: StringBuffer -> Char# -> StringBuffer
+stepOnUntilChar# (StringBuffer fo l# s# c#) x# =
loop c#
where
loop c#
| c# >=# l# || indexCharOffAddr# fo c# `eqChar#` x#
- = StringBuffer fo l# s# c#
+ = StringBuffer fo l# c# c#
| otherwise
= loop (c# +# 1#)
else
unpackCStringBA (copySubStr (A# fo) (I# start_pos#) (I# (current# -# start_pos#)))
-lexemeToByteArray :: StringBuffer -> _ByteArray Int
+lexemeToByteArray :: StringBuffer -> ByteArray Int
lexemeToByteArray (StringBuffer fo _ start_pos# current#) =
if start_pos# ==# current# then
error "lexemeToByteArray"
projects / ghc-hetmet.git / blobdiff