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ref/haskell: refactor error handling for bech32Decode#1
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manifoldhiker merged 4 commits intomasterfrom Mar 24, 2018
Merged
ref/haskell: refactor error handling for bech32Decode#1manifoldhiker merged 4 commits intomasterfrom
manifoldhiker merged 4 commits intomasterfrom
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chshersh
reviewed
Mar 19, 2018
| bech32Decode bech32 = do | ||
| guard $ BS.length bech32 <= 90 | ||
| guard $ BSC.map toUpper bech32 == bech32 || BSC.map toLower bech32 == bech32 | ||
| when (BS.length bech32 > 90) (Left Bech32StringLengthExceeded) |
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Since you use this pattern a lot I would recomment implementing local function like:
verify :: Bool -> a -> Either a bIt's like guard but for Either.
| guard $ BS.length bech32 <= 90 | ||
| guard $ BSC.map toUpper bech32 == bech32 || BSC.map toLower bech32 == bech32 | ||
| when (BS.length bech32 > 90) (Left Bech32StringLengthExceeded) | ||
| when (not $ validCase bech32) (Left CaseInconsistency) |
| when (BS.length dat < 6) (Left TooShortDataPart) | ||
| hrp' <- maybe (Left InvalidHRP) Right $ BSC.stripSuffix (BSC.pack "1") hrp | ||
| when (not $ validHRP hrp') (Left InvalidHRP) | ||
| dat' <- maybe (Left InvalidCharsetMap) Right $ mapM charsetMap $ BSC.unpack dat |
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If you implemented locally rightToMaybe you could also implement maybeToRight
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@kirelagin please, review this. I am not quite sure about that, especially about naming |
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The main reason to refactor was the Maybe in a signature. It is not clear why the given bech32 string is invalid.
Reopen of sipa#41