1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
{-# LANGUAGE OverloadedStrings #-}
module Redis.Scanner
( reply
)
where
import Scanner (Scanner)
import qualified Scanner
import Redis.Reply
import Prelude hiding (error)
import Data.ByteString (ByteString)
import qualified Data.Text.Encoding as Text
import qualified Data.Text.Read as Text
import Control.Monad
{-# INLINE reply #-}
reply :: Scanner Reply
reply = do
c <- Scanner.anyChar8
case c of
'+' -> string
'-' -> error
':' -> integer
'$' -> bulk
'*' -> multi
_ -> fail "Unknown reply type"
{-# INLINE string #-}
string :: Scanner Reply
string = String <$> line
{-# INLINE error #-}
error :: Scanner Reply
error = Error <$> line
{-# INLINE integer #-}
integer :: Scanner Reply
integer = Integer <$> integral
{-# INLINE bulk #-}
bulk :: Scanner Reply
bulk = Bulk <$> do
len <- integral
if len < 0
then return Nothing
else Just <$> Scanner.take len <* eol
-- don't inline it to break the circle between reply and multi
{-# NOINLINE multi #-}
multi :: Scanner Reply
multi = Multi <$> do
len <- integral
if len < 0
then return Nothing
else Just <$> replicateM len reply
{-# INLINE integral #-}
integral :: Integral i => Scanner i
integral = do
str <- line
case Text.signed Text.decimal (Text.decodeUtf8 str) of
Left err -> fail (show err)
Right (l, _) -> return l
{-# INLINE line #-}
line :: Scanner ByteString
line = Scanner.takeWhileChar8 (/= '\r') <* eol
{-# INLINE eol #-}
eol :: Scanner ()
eol = do
Scanner.char8 '\r'
Scanner.char8 '\n'
|
