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https://github.com/idris-lang/Idris2.git
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dbdf7dab3d
Following a fairly detailed discussion on slack, the feeling is generally that it's better to have a single interface. While precision is nice, it doesn't appear to buy us anything here. If that turns out to be wrong, or limiting somehow, we can revisit it later. Also: - it's easier for backend authors if the type of IO operations is slightly less restrictive. For example, if it's in HasIO, that limits alternative implementations, which might be awkward for some alternative back ends. - it's one less extra detail to learn. This is minor, but there needs to be a clear advantage if there's more detail to learn. - It is difficult to think of an underlying type that can't have a Monad instance (I have personally never encountered one - if they turns out to exist, again, we can revisit!)
45 lines
1.4 KiB
Idris
45 lines
1.4 KiB
Idris
module Debug.Buffer
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import Data.Buffer
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import Data.List
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import Data.String.Extra
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toHex : Int -> Int -> String
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toHex d n = pack $ reverse $ foldl toHexDigit [] (slice d n [])
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where
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toHexDigit : List Char ->Int -> List Char
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toHexDigit acc i = chr (if i < 10 then i + ord '0' else (i-10) + ord 'A')::acc
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slice : Int -> Int -> List Int -> List Int
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slice 0 _ acc = acc
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slice d n acc = slice (d-1) (n `div` 16) ((n `mod` 16)::acc)
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showSep : String -> Nat -> List String -> String
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showSep sep _ [] = ""
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showSep sep n [x] = x ++ replicate (3*n) ' '
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showSep sep Z (x :: xs) = x ++ sep ++ showSep sep Z xs
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showSep sep (S n) (x :: xs) = x ++ sep ++ showSep sep n xs
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renderRow : List Int -> String
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renderRow dat = showSep " " 16 (map (toHex 2) dat) ++
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" " ++ pack (map (\i => if i > 0x1f && i < 0x80 then chr i else '.') dat)
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group : Nat -> List a -> List (List a)
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group n xs = worker [] xs
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where
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worker : List (List a) -> List a -> List (List a)
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worker acc [] = reverse acc
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worker acc ys = worker ((take n ys)::acc) (drop n ys)
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export
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dumpBuffer : HasIO io => Buffer -> io String
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dumpBuffer buf = do
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size <- liftIO $ rawSize buf
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dat <- liftIO $ bufferData buf
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let rows = group 16 dat
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let hex = showSep "\n" 0 (map renderRow rows)
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pure $ hex ++ "\n\ntotal size = " ++ show size
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export
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printBuffer : HasIO io => Buffer -> io ()
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printBuffer buf = putStrLn $ !(dumpBuffer buf)
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