Documentation

Convert value to HTTP API data.

Parse value from HTTP API data.

Convert multiple values to a list of URL pieces.

>>> toUrlPieces [1, 2, 3]
["1","2","3"]

Parse multiple URL pieces.

>>> parseUrlPieces ["true", "false"] :: Either Text [Bool]
Right [True,False]
>>> parseUrlPieces ["123", "hello", "world"] :: Either Text [Int]
Left "could not parse: `hello' (input does not start with a digit)"

Convert multiple values to a list of query parameter values.

>>> toQueryParams [fromGregorian 2015 10 03, fromGregorian 2015 12 01]
["2015-10-03","2015-12-01"]

Parse multiple query parameters.

>>> parseQueryParams ["1", "2", "3"] :: Either Text [Int]
Right [1,2,3]
>>> parseQueryParams ["64", "128", "256"] :: Either Text [Word8]
Left "out of bounds: `256' (should be between 0 and 255)"

Parse URL path piece in a Maybe.

>>> parseUrlPieceMaybe "12" :: Maybe Int
Just 12

Parse HTTP header value in a Maybe.

>>> parseHeaderMaybe "hello" :: Maybe Text
Just "hello"

Parse query param value in a Maybe.

>>> parseQueryParamMaybe "true" :: Maybe Bool
Just True

Default parsing error.

Convert Maybe parser into Either Text parser with default error message.

Lower case.

Convert to URL piece using Show instance. The result is always lower cased.

>>> showTextData True
"true"

This can be used as a default implementation for enumeration types:

>>> data MyData = Foo | Bar | Baz deriving (Show)
>>> instance ToHttpApiData MyData where toUrlPiece = showTextData
>>> toUrlPiece Foo
"foo"

Like show, but returns Text.

Case insensitive.

Parse given text case insensitive and then parse the rest of the input using parseUrlPiece.

>>> parseUrlPieceWithPrefix "Just " "just 10" :: Either Text Int
Right 10
>>> parseUrlPieceWithPrefix "Left " "left" :: Either Text Bool
Left "could not parse: `left'"

This can be used to implement FromHttpApiData for single field constructors:

>>> data Foo = Foo Int deriving (Show)
>>> instance FromHttpApiData Foo where parseUrlPiece s = Foo <$> parseUrlPieceWithPrefix "Foo " s
>>> parseUrlPiece "foo 1" :: Either Text Foo
Right (Foo 1)

Parse given bytestring then parse the rest of the input using parseHeader.

data BasicAuthToken = BasicAuthToken Text deriving (Show)

instance FromHttpApiData BasicAuthToken where
  parseHeader h     = BasicAuthToken <$> parseHeaderWithPrefix "Basic " h
  parseQueryParam p = BasicAuthToken <$> parseQueryParam p

>>> parseHeader "Basic QWxhZGRpbjpvcGVuIHNlc2FtZQ==" :: Either Text BasicAuthToken
Right (BasicAuthToken "QWxhZGRpbjpvcGVuIHNlc2FtZQ==")

Case insensitive.

Parse given text case insensitive and then parse the rest of the input using parseQueryParam.

>>> parseQueryParamWithPrefix "z" "z10" :: Either Text Int
Right 10

Case insensitive.

Parse values case insensitively based on Show instance.

>>> parseBoundedTextData "true" :: Either Text Bool
Right True
>>> parseBoundedTextData "FALSE" :: Either Text Bool
Right False

This can be used as a default implementation for enumeration types:

>>> data MyData = Foo | Bar | Baz deriving (Show, Bounded, Enum)
>>> instance FromHttpApiData MyData where parseUrlPiece = parseBoundedTextData
>>> parseUrlPiece "foo" :: Either Text MyData
Right Foo

Parse URL piece using Read instance.

Use for types which do not involve letters:

>>> readTextData "1991-06-02" :: Either Text Day
Right 1991-06-02

This parser is case sensitive and will not match showTextData in presense of letters:

>>> readTextData (showTextData True) :: Either Text Bool
Left "could not parse: `true'"

See parseBoundedTextData.

Run Reader as HTTP API data parser.

Run Reader to parse bounded integral value with bounds checking.

>>> parseBounded decimal "256" :: Either Text Word8
Left "out of bounds: `256' (should be between 0 and 255)"