3 -- 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
4 -- 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。
6 module Network.HTTP.Lucu.Format
15 fmtInt :: Int -> Bool -> Int -> Char -> Bool -> Int -> String
16 fmtInt base upperCase minWidth pad forceSign n
17 = base `seq` minWidth `seq` pad `seq` forceSign `seq` n `seq`
18 let raw = reverse $! fmt' (abs n)
19 sign = if forceSign || n < 0 then
20 if n < 0 then "-" else "+"
23 padded = padStr (minWidth - length sign) pad raw
29 | n < base = (intToChar upperCase n) : []
30 | otherwise = (intToChar upperCase $! n `mod` base) : fmt' (n `div` base)
33 fmtDec :: Int -> Int -> String
35 | minWidth == 2 = fmtDec2 n -- optimization
36 | minWidth == 3 = fmtDec3 n -- optimization
37 | minWidth == 4 = fmtDec4 n -- optimization
38 | otherwise = fmtInt 10 undefined minWidth '0' False n
42 fmtDec2 :: Int -> String
44 | n < 0 || n >= 100 = fmtInt 10 undefined 2 '0' False n -- fallback
46 : intToChar undefined n
48 | otherwise = intToChar undefined (n `div` 10)
49 : intToChar undefined (n `mod` 10)
53 fmtDec3 :: Int -> String
55 | n < 0 || n >= 1000 = fmtInt 10 undefined 3 '0' False n -- fallback
57 : intToChar undefined n
60 : intToChar undefined ((n `div` 10) `mod` 10)
61 : intToChar undefined ( n `mod` 10)
63 | otherwise = intToChar undefined ((n `div` 100) `mod` 10)
64 : intToChar undefined ((n `div` 10) `mod` 10)
65 : intToChar undefined ( n `mod` 10)
69 fmtDec4 :: Int -> String
71 | n < 0 || n >= 10000 = fmtInt 10 undefined 4 '0' False n -- fallback
72 | n < 10 = '0' : '0' : '0'
73 : intToChar undefined n
76 : intToChar undefined ((n `div` 10) `mod` 10)
77 : intToChar undefined ( n `mod` 10)
80 : intToChar undefined ((n `div` 100) `mod` 10)
81 : intToChar undefined ((n `div` 10) `mod` 10)
82 : intToChar undefined ( n `mod` 10)
84 | otherwise = intToChar undefined ((n `div` 1000) `mod` 10)
85 : intToChar undefined ((n `div` 100) `mod` 10)
86 : intToChar undefined ((n `div` 10) `mod` 10)
87 : intToChar undefined ( n `mod` 10)
91 fmtHex :: Bool -> Int -> Int -> String
92 fmtHex upperCase minWidth
93 = fmtInt 16 upperCase minWidth '0' False
96 padStr :: Int -> Char -> String -> String
97 padStr minWidth pad str
98 = let delta = minWidth - length str
101 replicate delta pad ++ str
106 intToChar :: Bool -> Int -> Char
117 intToChar False 10 = 'a'
118 intToChar True 10 = 'A'
119 intToChar False 11 = 'b'
120 intToChar True 11 = 'B'
121 intToChar False 12 = 'c'
122 intToChar True 12 = 'C'
123 intToChar False 13 = 'd'
124 intToChar True 13 = 'D'
125 intToChar False 14 = 'e'
126 intToChar True 14 = 'E'
127 intToChar False 15 = 'f'
128 intToChar True 15 = 'F'