Copyright	© 2016–2018 Stack Builders
License	MIT
Maintainer	Mark Karpov <markkarpov92@gmail.org>
Stability	experimental
Portability	portable
Safe Haskell	None
Language	Haskell2010

Data.Csv.Parser.Megaparsec

Description

A CSV parser. The parser here is RFC 4180 compliant, with the following extensions:

Non-escaped fields may contain any characters except double-quotes, commas (or generally delimiter characters), carriage returns, and newlines.
Escaped fields may contain any characters, but double-quotes need to be escaped.

The parser provides better error messages than the parser that comes with Cassava library, while being compatible with the rest of the library.

Synopsis

newtype ConversionError = ConversionError String
decode :: FromRecord a => HasHeader -> FilePath -> ByteString -> Either (ParseErrorBundle ByteString ConversionError) (Vector a)
decodeWith :: FromRecord a => DecodeOptions -> HasHeader -> FilePath -> ByteString -> Either (ParseErrorBundle ByteString ConversionError) (Vector a)
decodeByName :: FromNamedRecord a => FilePath -> ByteString -> Either (ParseErrorBundle ByteString ConversionError) (Header, Vector a)
decodeByNameWith :: FromNamedRecord a => DecodeOptions -> FilePath -> ByteString -> Either (ParseErrorBundle ByteString ConversionError) (Header, Vector a)

Documentation

newtype ConversionError Source #

Custom error component for CSV parsing. It allows typed reporting of conversion errors.

Constructors

ConversionError String

Instances

Instances details

Eq ConversionError Source #
Instance details Defined in Data.Csv.Parser.Megaparsec Methods (==) :: ConversionError -> ConversionError -> Bool # (/=) :: ConversionError -> ConversionError -> Bool #
Data ConversionError Source #
Instance details Defined in Data.Csv.Parser.Megaparsec Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> ConversionError -> c ConversionError # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c ConversionError # toConstr :: ConversionError -> Constr # dataTypeOf :: ConversionError -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c ConversionError) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c ConversionError) # gmapT :: (forall b. Data b => b -> b) -> ConversionError -> ConversionError # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> ConversionError -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> ConversionError -> r # gmapQ :: (forall d. Data d => d -> u) -> ConversionError -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> ConversionError -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> ConversionError -> m ConversionError # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> ConversionError -> m ConversionError # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> ConversionError -> m ConversionError #
Ord ConversionError Source #
Instance details Defined in Data.Csv.Parser.Megaparsec Methods compare :: ConversionError -> ConversionError -> Ordering # (<) :: ConversionError -> ConversionError -> Bool # (<=) :: ConversionError -> ConversionError -> Bool # (>) :: ConversionError -> ConversionError -> Bool # (>=) :: ConversionError -> ConversionError -> Bool # max :: ConversionError -> ConversionError -> ConversionError # min :: ConversionError -> ConversionError -> ConversionError #
Read ConversionError Source #
Instance details Defined in Data.Csv.Parser.Megaparsec Methods readsPrec :: Int -> ReadS ConversionError # readList :: ReadS [ConversionError] # readPrec :: ReadPrec ConversionError # readListPrec :: ReadPrec [ConversionError] #
Show ConversionError Source #
Instance details Defined in Data.Csv.Parser.Megaparsec Methods showsPrec :: Int -> ConversionError -> ShowS # show :: ConversionError -> String # showList :: [ConversionError] -> ShowS #
ShowErrorComponent ConversionError Source #
Instance details Defined in Data.Csv.Parser.Megaparsec Methods showErrorComponent :: ConversionError -> String Source # errorComponentLen :: ConversionError -> Int Source #

decode Source #

Arguments

:: FromRecord a
=> HasHeader	Whether the data contains header that should be skipped
-> FilePath	File name (only for displaying in parse error messages, use empty string if you have none)
-> ByteString	CSV data
-> Either (ParseErrorBundle ByteString ConversionError) (Vector a)

Deserialize CSV records form a lazy ByteString. If this fails due to incomplete or invalid input, Left is returned. Equivalent to decodeWith defaultDecodeOptions.

decodeWith Source #

Arguments

:: FromRecord a
=> DecodeOptions	Decoding options
-> HasHeader	Whether the data contains header that should be skipped
-> FilePath	File name (only for displaying in parse error messages, use empty string if you have none)
-> ByteString	CSV data
-> Either (ParseErrorBundle ByteString ConversionError) (Vector a)

Like decode, but lets you customize how the CSV data is parsed.

decodeByName Source #

Arguments

:: FromNamedRecord a
=> FilePath	File name (only for displaying in parse error messages, use empty string if you have none)
-> ByteString	CSV data
-> Either (ParseErrorBundle ByteString ConversionError) (Header, Vector a)

Deserialize CSV records from a lazy ByteString. If this fails due to incomplete or invalid input, Left is returned. The data is assumed to be preceded by a header. Equivalent to decodeByNameWith defaultDecodeOptions.

decodeByNameWith Source #

Arguments

:: FromNamedRecord a
=> DecodeOptions	Decoding options
-> FilePath	File name (only for displaying in parse error messages, use empty string if you have none)
-> ByteString	CSV data
-> Either (ParseErrorBundle ByteString ConversionError) (Header, Vector a)

Like decodeByName, but lets you customize how the CSV data is parsed.