1 -- 本當にこんなものを自分で書く必要があったのだらうか。Printf は重いの
2 -- で駄目だが、それ以外のモジュールを探しても見付からなかった。
4 module Network.HTTP.Lucu.Format
13 fmtInt :: Int -> Bool -> Int -> Char -> Bool -> Int -> String
14 fmtInt base upperCase minWidth pad forceSign n
15 = base `seq` minWidth `seq` pad `seq` forceSign `seq` n `seq`
16 let raw = reverse $! fmt' (abs n)
17 sign = if forceSign || n < 0 then
18 if n < 0 then "-" else "+"
21 padded = padStr (minWidth - length sign) pad raw
27 | m < base = [intToChar upperCase m]
28 | otherwise = (intToChar upperCase $! m `mod` base) : fmt' (m `div` base)
31 fmtDec :: Int -> Int -> String
33 | minWidth == 2 = fmtDec2 n -- optimization
34 | minWidth == 3 = fmtDec3 n -- optimization
35 | minWidth == 4 = fmtDec4 n -- optimization
36 | otherwise = fmtInt 10 undefined minWidth '0' False n
40 fmtDec2 :: Int -> String
42 | n < 0 || n >= 100 = fmtInt 10 undefined 2 '0' False n -- fallback
44 , intToChar undefined n
46 | otherwise = [ intToChar undefined (n `div` 10)
47 , intToChar undefined (n `mod` 10)
51 fmtDec3 :: Int -> String
53 | n < 0 || n >= 1000 = fmtInt 10 undefined 3 '0' False n -- fallback
56 , intToChar undefined n
59 , intToChar undefined ((n `div` 10) `mod` 10)
60 , intToChar undefined ( n `mod` 10)
62 | otherwise = [ intToChar undefined ((n `div` 100) `mod` 10)
63 , intToChar undefined ((n `div` 10) `mod` 10)
64 , intToChar undefined ( n `mod` 10)
68 fmtDec4 :: Int -> String
70 | n < 0 || n >= 10000 = fmtInt 10 undefined 4 '0' False n -- fallback
74 , intToChar undefined n
78 , intToChar undefined ((n `div` 10) `mod` 10)
79 , intToChar undefined ( n `mod` 10)
82 , intToChar undefined ((n `div` 100) `mod` 10)
83 , intToChar undefined ((n `div` 10) `mod` 10)
84 , intToChar undefined ( n `mod` 10)
86 | otherwise = [ intToChar undefined ((n `div` 1000) `mod` 10)
87 , intToChar undefined ((n `div` 100) `mod` 10)
88 , intToChar undefined ((n `div` 10) `mod` 10)
89 , intToChar undefined ( n `mod` 10)
93 fmtHex :: Bool -> Int -> Int -> String
94 fmtHex upperCase minWidth
95 = fmtInt 16 upperCase minWidth '0' False
98 padStr :: Int -> Char -> String -> String
99 padStr minWidth pad str
100 = let delta = minWidth - length str
103 replicate delta pad ++ str
108 intToChar :: Bool -> Int -> Char
119 intToChar False 10 = 'a'
120 intToChar True 10 = 'A'
121 intToChar False 11 = 'b'
122 intToChar True 11 = 'B'
123 intToChar False 12 = 'c'
124 intToChar True 12 = 'C'
125 intToChar False 13 = 'd'
126 intToChar True 13 = 'D'
127 intToChar False 14 = 'e'
128 intToChar True 14 = 'E'
129 intToChar False 15 = 'f'
130 intToChar True 15 = 'F'
131 intToChar _ _ = undefined