Text.Show.Pretty

Functions for human-readable derived Show instances.

Generic representation of values

data Value

Generic Haskell values. NaN and Infinity are represented as constructors. The String in the literals is the text for the literals "as is".

A chain of infix constructors means that they appeared in the input string without parentheses, i.e

1 :+: 2 :*: 3 is represented with InfixCons 1 [(":+:",2),(":*:",3)], whereas

1 :+: (2 :*: 3) is represented with InfixCons 1 [(":+:",InfixCons 2 [(":*:",3)])].

Constructors

Con Name [Value]

Data constructor

InfixCons Value [(Name, Value)]

Infix data constructor chain

Rec Name [(Name, Value)]

Record value

Tuple [Value]

Tuple

List [Value]

List

Neg Value

Negated value

Ratio Value Value

Rational

Integer String

Non-negative integer

Float String

Non-negative floating num.

Char String

Character

String String

String

Instances

Eq Value

Methods

(==) :: Value -> Value -> Bool

(/=) :: Value -> Value -> Bool

Show Value

Methods

showsPrec :: Int -> Value -> ShowS

show :: Value -> String

showList :: [Value] -> ShowS

type Name = String

A name.

valToStr :: Value -> String

Pretty print a generic value. Our intention is that the result is equivalent to the Show instance for the original value, except possibly easier to understand by a human.

valToDoc :: Value -> Doc

Pretty print a generic value. Our intention is that the result is equivalent to the Show instance for the original value, except possibly easier to understand by a human.

valToHtmlPage :: HtmlOpts -> Value -> String

Make an Html page representing the given value.

Values using the Show class

parseValue :: String -> Maybe Value

reify :: Show a => a -> Maybe Value

ppDoc :: Show a => a -> Doc

Try to show a value, prettily. If we do not understand the value, then we just use its standard Show instance.

ppShow :: Show a => a -> String

Convert a generic value into a pretty String, if possible.

pPrint :: Show a => a -> IO ()

Pretty print a generic value to stdout. This is particularly useful in the GHCi interactive environment.

Values using the PrettyVal class

dumpDoc :: PrettyVal a => a -> Doc

Render a value in the PrettyVal class to a Doc. The benefit of this function is that PrettyVal instances may be derived automatically using generics.

dumpStr :: PrettyVal a => a -> String

Render a value in the PrettyVal class to a String. The benefit of this function is that PrettyVal instances may be derived automatically using generics.

class PrettyVal a where

A class for types that may be reified into a value. Instances of this class may be derived automatically, for datatypes that support Generics.

Methods

prettyVal :: a -> Value

prettyVal :: (GDump (Rep a), Generic a) => a -> Value

Instances

PrettyVal Bool

Methods

prettyVal :: Bool -> Value

listValue :: [Bool] -> Value

PrettyVal Char

Methods

prettyVal :: Char -> Value

listValue :: [Char] -> Value

PrettyVal Double

Methods

prettyVal :: Double -> Value

listValue :: [Double] -> Value

PrettyVal Float

Methods

prettyVal :: Float -> Value

listValue :: [Float] -> Value

PrettyVal Int

Methods

prettyVal :: Int -> Value

listValue :: [Int] -> Value

PrettyVal Int8

Methods

prettyVal :: Int8 -> Value

listValue :: [Int8] -> Value

PrettyVal Int16

Methods

prettyVal :: Int16 -> Value

listValue :: [Int16] -> Value

PrettyVal Int32

Methods

prettyVal :: Int32 -> Value

listValue :: [Int32] -> Value

PrettyVal Int64

Methods

prettyVal :: Int64 -> Value

listValue :: [Int64] -> Value

PrettyVal Integer

Methods

prettyVal :: Integer -> Value

listValue :: [Integer] -> Value

PrettyVal Ordering

Methods

prettyVal :: Ordering -> Value

listValue :: [Ordering] -> Value

PrettyVal Word8

Methods

prettyVal :: Word8 -> Value

listValue :: [Word8] -> Value

PrettyVal Word16

Methods

prettyVal :: Word16 -> Value

listValue :: [Word16] -> Value

PrettyVal Word32

Methods

prettyVal :: Word32 -> Value

listValue :: [Word32] -> Value

PrettyVal Word64

Methods

prettyVal :: Word64 -> Value

listValue :: [Word64] -> Value

PrettyVal a => PrettyVal [a]

Methods

prettyVal :: [a] -> Value

listValue :: [[a]] -> Value

PrettyVal a => PrettyVal (Maybe a)

Methods

prettyVal :: Maybe a -> Value

listValue :: [Maybe a] -> Value

(PrettyVal a, Integral a) => PrettyVal (Ratio a)

Methods

prettyVal :: Ratio a -> Value

listValue :: [Ratio a] -> Value

(PrettyVal a, PrettyVal b) => PrettyVal (Either a b)

Methods

prettyVal :: Either a b -> Value

listValue :: [Either a b] -> Value

(PrettyVal a1, PrettyVal a2) => PrettyVal (a1, a2)

Methods

prettyVal :: (a1, a2) -> Value

listValue :: [(a1, a2)] -> Value

(PrettyVal a1, PrettyVal a2, PrettyVal a3) => PrettyVal (a1, a2, a3)

Methods

prettyVal :: (a1, a2, a3) -> Value

listValue :: [(a1, a2, a3)] -> Value

(PrettyVal a1, PrettyVal a2, PrettyVal a3, PrettyVal a4) => PrettyVal (a1, a2, a3, a4)

Methods

prettyVal :: (a1, a2, a3, a4) -> Value

listValue :: [(a1, a2, a3, a4)] -> Value

(PrettyVal a1, PrettyVal a2, PrettyVal a3, PrettyVal a4, PrettyVal a5) => PrettyVal (a1, a2, a3, a4, a5)

Methods

prettyVal :: (a1, a2, a3, a4, a5) -> Value

listValue :: [(a1, a2, a3, a4, a5)] -> Value

(PrettyVal a1, PrettyVal a2, PrettyVal a3, PrettyVal a4, PrettyVal a5, PrettyVal a6) => PrettyVal (a1, a2, a3, a4, a5, a6)

Methods

prettyVal :: (a1, a2, a3, a4, a5, a6) -> Value

listValue :: [(a1, a2, a3, a4, a5, a6)] -> Value

(PrettyVal a1, PrettyVal a2, PrettyVal a3, PrettyVal a4, PrettyVal a5, PrettyVal a6, PrettyVal a7) => PrettyVal (a1, a2, a3, a4, a5, a6, a7)

Methods

prettyVal :: (a1, a2, a3, a4, a5, a6, a7) -> Value

listValue :: [(a1, a2, a3, a4, a5, a6, a7)] -> Value

Rendering values to Html

valToHtml :: HtmlOpts -> Value -> Html

Convert a value into an Html fragment.

data HtmlOpts

Options on how to generate Html (more to come).

Constructors

HtmlOpts

Fields

• dataDir :: FilePath

  Path for extra files. If empty, we look in directory style, relative to document.

• wideListWidth :: Int

  Max. number of columns in wide lists.

Instances

Show HtmlOpts

Methods

showsPrec :: Int -> HtmlOpts -> ShowS

show :: HtmlOpts -> String

showList :: [HtmlOpts] -> ShowS

defaultHtmlOpts :: HtmlOpts

Default options.

htmlPage :: HtmlOpts -> Html -> String

Wrap an Html fragment to make an Html page.

newtype Html

Constructors

Html

Fields

• exportHtml :: String

Get location of data files

getDataDir :: IO FilePath

Deprecated

ppValue :: Value -> Doc

Deprecated: Please use valToDoc instead.