pretty-show-1.1: Tools for working with derived Show instances. Source code Contents Index

Text.Show.Pretty Portability Haskell 98 Stability provisional Maintainer iavor.diatchki@gmail.com

Description

Functions for human-readable derived Show instances.

Synopsis

type Name = String data Value = Con Name [Value] | Rec Name [(Name, Value)] | Tuple [Value] | List [Value] | Neg Value | Ratio Value Value | Integer String | Float String | Char String | String String parseValue :: String -> Maybe Value reify :: Show a => a -> Maybe Value ppValue :: Value -> Doc ppDoc :: Show a => a -> Doc ppShow :: Show a => a -> String

Documentation

type Name = String Source

A name.

data Value Source

Generic Haskell values. NaN and Infinity are represented as constructors. The String in the literals is the text for the literals "as is". Constructors Con Name [Value] Data constructor 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 Show Value

parseValue :: String -> Maybe Value Source

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

ppValue :: Value -> Doc Source

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.

ppDoc :: Show a => a -> Doc Source

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 Source

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

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