HORIZON HASKELLDocslts/ghc-9.10.x248f8f02026-10-05Search names, modules, packages, or :: a typeCtrl K

GHC 9.10.3 · lts/ghc-9.10.x · 248f8f0 · 2026-10-05

Modulereadable-0.3.1Haskell98

Data.Readable

The Read type class is very useful for building data types from String representations. But String has high overhead, so sometimes it isn't suitable for applications where space usage and performance are important. This library provides a simpler version of Read's functionality for Text and ByteStrings.

  • 1 class
  • Packagereadable-0.3.1
  • Exports1
  • LanguageHaskell98
  • LicenceBSD-3-Clause
  • SourceReadable.hs
classclass Readable a where
#

ByteString and Text reading using MonadPlus to handle parse failure. On error, fromText and fromBS will return mzero. You can use mplus to provide fallback defaults.

Methods

  • fromText :: MonadPlus m => Text -> m a

    Reads data from a Text representation.

  • fromBS :: MonadPlus m => ByteString -> m a

    Reads data from a UTF8 encoded ByteString. The default implementation of this function simply decodes with UTF-8 and then calls the fromText function. If decoding fails, mzero will be returned. You can provide your own implementation if you need different behavior such as not decoding to UTF8.

Instances15Readable, …