-----------------------------------------------------------------------------
-- |
-- Module : Text.Printf
--- Copyright : (c) Lennart Augustsson, 2004
+-- Copyright : (c) Lennart Augustsson, 2004-2008
-- License : BSD-style (see the file libraries/base/LICENSE)
--
-- Maintainer : lennart@augustsson.net
--
-----------------------------------------------------------------------------
+{-# Language CPP #-}
+
module Text.Printf(
printf, hPrintf,
PrintfType, HPrintfType, PrintfArg, IsChar
u:us'' ->
(case c of
'c' -> adjust ("", [toEnum (toint u)])
- 'd' -> adjust' (fmti u)
- 'i' -> adjust' (fmti u)
- 'x' -> adjust ("", fmtu 16 u)
- 'X' -> adjust ("", map toUpper $ fmtu 16 u)
- 'o' -> adjust ("", fmtu 8 u)
- 'u' -> adjust ("", fmtu 10 u)
+ 'd' -> adjust' (fmti prec u)
+ 'i' -> adjust' (fmti prec u)
+ 'x' -> adjust ("", fmtu 16 prec u)
+ 'X' -> adjust ("", map toUpper $ fmtu 16 prec u)
+ 'o' -> adjust ("", fmtu 8 prec u)
+ 'u' -> adjust ("", fmtu 10 prec u)
'e' -> adjust' (dfmt' c prec u)
'E' -> adjust' (dfmt' c prec u)
'f' -> adjust' (dfmt' c prec u)
'g' -> adjust' (dfmt' c prec u)
'G' -> adjust' (dfmt' c prec u)
- 's' -> adjust ("", tostr u)
+ 's' -> adjust ("", tostr prec u)
_ -> perror ("bad formatting char " ++ [c])
) ++ uprintf cs'' us''
-fmti :: UPrintf -> (String, String)
-fmti (UInteger _ i) = if i < 0 then ("-", show (-i)) else ("", show i)
-fmti (UChar c) = fmti (uInteger (fromEnum c))
-fmti _ = baderr
+fmti :: Int -> UPrintf -> (String, String)
+fmti prec (UInteger _ i) = if i < 0 then ("-", integral_prec prec (show (-i))) else ("", integral_prec prec (show i))
+fmti _ (UChar c) = fmti 0 (uInteger (fromEnum c))
+fmti _ _ = baderr
+
+fmtu :: Integer -> Int -> UPrintf -> String
+fmtu b prec (UInteger l i) = integral_prec prec (itosb b (if i < 0 then -2*l + i else i))
+fmtu b _ (UChar c) = itosb b (toInteger (fromEnum c))
+fmtu _ _ _ = baderr
-fmtu :: Integer -> UPrintf -> String
-fmtu b (UInteger l i) = itosb b (if i < 0 then -2*l + i else i)
-fmtu b (UChar c) = itosb b (toInteger (fromEnum c))
-fmtu _ _ = baderr
+integral_prec :: Int -> String -> String
+integral_prec prec integral = (replicate (prec - (length integral)) '0') ++ integral
toint :: UPrintf -> Int
toint (UInteger _ i) = fromInteger i
toint (UChar c) = fromEnum c
toint _ = baderr
-tostr :: UPrintf -> String
-tostr (UString s) = s
-tostr _ = baderr
+tostr :: Int -> UPrintf -> String
+tostr n (UString s) = if n >= 0 then take n s else s
+tostr _ _ = baderr
itosb :: Integer -> Integer -> String
itosb b n =
getSpecs _ z s ('-':cs) us = getSpecs True z s cs us
getSpecs l z _ ('+':cs) us = getSpecs l z True cs us
getSpecs l _ s ('0':cs) us = getSpecs l True s cs us
-getSpecs l z s ('*':cs) us =
- case us of
- [] -> argerr
- nu : us' ->
- let n = toint nu
- (p, cs'', us'') =
+getSpecs l z s ('*':cs) us =
+ let (us', n) = getStar us
+ ((p, cs''), us'') =
case cs of
- '.':'*':r -> case us' of { [] -> argerr; pu:us''' -> (toint pu, r, us''') }
- '.':r -> let (n', cs') = stoi 0 r in (n', cs', us')
- _ -> (-1, cs, us')
- in (n, p, l, z, s, cs'', us'')
+ '.':'*':r -> let (us''', p') = getStar us'
+ in ((p', r), us''')
+ '.':r -> (stoi 0 r, us')
+ _ -> ((-1, cs), us')
+ in (n, p, l, z, s, cs'', us'')
getSpecs l z s ('.':cs) us =
- let (p, cs') = stoi 0 cs
- in (0, p, l, z, s, cs', us)
+ let ((p, cs'), us') =
+ case cs of
+ '*':cs'' -> let (us'', p') = getStar us in ((p', cs''), us'')
+ _ -> (stoi 0 cs, us)
+ in (0, p, l, z, s, cs', us')
getSpecs l z s cs@(c:_) us | isDigit c =
let (n, cs') = stoi 0 cs
- (p, cs'') = case cs' of
- '.':r -> stoi 0 r
- _ -> (-1, cs')
- in (n, p, l, z, s, cs'', us)
+ ((p, cs''), us') = case cs' of
+ '.':'*':r -> let (us'', p') = getStar us in ((p', r), us'')
+ '.':r -> (stoi 0 r, us)
+ _ -> ((-1, cs'), us)
+ in (n, p, l, z, s, cs'', us')
getSpecs l z s cs us = (0, -1, l, z, s, cs, us)
+getStar :: [UPrintf] -> ([UPrintf], Int)
+getStar us =
+ case us of
+ [] -> argerr
+ nu : us' -> (us', toint nu)
+
+
dfmt' :: Char -> Int -> UPrintf -> (String, String)
dfmt' c p (UDouble d) = dfmt c p d
dfmt' c p (UFloat f) = dfmt c p f