Add a cmd quasiquoter #75
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Fixes: #73 |
adithyaov
reviewed
Jun 19, 2023
Comment on lines
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| data StrSegment | ||
| = StrText String | ||
| | StrVar String | ||
| deriving (Show, Eq) | ||
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| formatSpace :: String -> String | ||
| formatSpace = foldr go "" | ||
| where | ||
| go x acc = x:if x == ' ' then dropWhile (' ' ==) acc else acc | ||
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| -- | Replace a newline by a space and convert multiple spaces to single space | ||
| -- | ||
| -- >>> :set -XQuasiQuotes | ||
| -- >>> import Streamly.Internal.System | ||
| -- >>> trim " abc \n bbb \n ccc " | ||
| -- " abc bbb ccc " | ||
| -- | ||
| trim :: String -> String | ||
| trim = formatSpace <$> (unwords . fmap formatSpace . lines) | ||
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| haskellIdentifier :: Monad m => Parser Char m String | ||
| haskellIdentifier = | ||
| let p = Parser.alphaNum <|> Parser.char '\'' <|> Parser.char '_' | ||
| in Parser.some p Fold.toList | ||
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| strParser :: Monad m => Parser Char m [StrSegment] | ||
| strParser = Parser.many content Fold.toList | ||
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| where | ||
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| plainText = StrText . trim <$> Parser.takeWhile1 (/= '#') Fold.toList | ||
| escHash = StrText . (: []) <$> (Parser.char '#' *> Parser.char '#') | ||
| lineCont = StrText [] <$ (Parser.char '#' *> Parser.char '\n') | ||
| var = StrVar <$> | ||
| ( Parser.char '#' | ||
| *> Parser.char '{' | ||
| *> haskellIdentifier | ||
| <* Parser.char '}' | ||
| ) | ||
| plainHash = StrText . (: []) <$> Parser.char '#' | ||
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| -- order is important | ||
| content = plainText <|> escHash <|> lineCont <|> var <|> plainHash | ||
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| strSegmentExp :: StrSegment -> Q Exp | ||
| strSegmentExp (StrText text) = stringE text | ||
| strSegmentExp (StrVar name) = do | ||
| valueName <- lookupValueName name | ||
| case valueName of | ||
| Just vn -> varE vn | ||
| Nothing -> | ||
| fail | ||
| $ "cmd quote: Haskell symbol `" ++ name | ||
| ++ "` is not in scope" | ||
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| strExp :: [StrSegment] -> Q Exp | ||
| strExp xs = appE [| concat |] $ listE $ map strSegmentExp xs |
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You don't need all this. This is replicated.
adithyaov
reviewed
Jun 19, 2023
Comment on lines
+36
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| formatSpace :: String -> String | ||
| formatSpace = foldr go "" | ||
| where | ||
| go x acc = x:if x == ' ' then dropWhile (' ' ==) acc else acc | ||
|
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| -- | Replace a newline by a space and convert multiple spaces to single space | ||
| -- | ||
| -- >>> :set -XQuasiQuotes | ||
| -- >>> import Streamly.Internal.System | ||
| -- >>> trim " abc \n bbb \n ccc " | ||
| -- " abc bbb ccc " | ||
| -- | ||
| trim :: String -> String | ||
| trim = formatSpace <$> (unwords . fmap formatSpace . lines) |
There was a problem hiding this comment.
You only need formatSpace and trim.
There was a problem hiding this comment.
We already have idiomatic code to do this:
-- | Replace newlines followed by any number of spaces with a single space.
oneLine :: String -> String
oneLine = unwords . fmap (dropWhile isSpace) . lines
adithyaov
reviewed
Jun 19, 2023
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| expandVars :: String -> Q Exp | ||
| expandVars ln = | ||
| case runIdentity $ Stream.parse strParser (Stream.fromList ln) of |
There was a problem hiding this comment.
You can import strParser from Unicode.String. If not exported, you can export it internally.
After runIdentity, you can use trim and formatSpace
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Let's import as much as we can from streamly-core instead of writing it again.
adithyaov
reviewed
Jun 19, 2023
| Right x -> | ||
| strExp x | ||
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| -- | A QuasiQuoter that treats the input as a string literal: |
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You'll need to change the documentation.
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You can point it to the str documentation and add the doc for the changes that you made.
harendra-kumar
requested changes
Jul 22, 2023
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| expandVars :: String -> Q Exp | ||
| expandVars ln = | ||
| case runIdentity $ Stream.parse strParser (Stream.fromList ln) of |
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Let's import as much as we can from streamly-core instead of writing it again.
Comment on lines
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| formatSpace :: String -> String | ||
| formatSpace = foldr go "" | ||
| where | ||
| go x acc = x:if x == ' ' then dropWhile (' ' ==) acc else acc | ||
|
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||
| -- | Replace a newline by a space and convert multiple spaces to single space | ||
| -- | ||
| -- >>> :set -XQuasiQuotes | ||
| -- >>> import Streamly.Internal.System | ||
| -- >>> trim " abc \n bbb \n ccc " | ||
| -- " abc bbb ccc " | ||
| -- | ||
| trim :: String -> String | ||
| trim = formatSpace <$> (unwords . fmap formatSpace . lines) |
There was a problem hiding this comment.
We already have idiomatic code to do this:
-- | Replace newlines followed by any number of spaces with a single space.
oneLine :: String -> String
oneLine = unwords . fmap (dropWhile isSpace) . lines
| -- | ||
| {-# LANGUAGE TemplateHaskell #-} | ||
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| module Streamly.Internal.System |
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Put this in the command module rather than creating a new module.
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