| Safe Haskell | Safe |
|---|---|
| Language | Haskell98 |
Data.Readable
Description
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.
Documentation
class Readable a where Source #
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.
Minimal complete definition
Methods
fromText :: MonadPlus m => Text -> m a Source #
Reads data from a Text representation.
fromBS :: MonadPlus m => ByteString -> m a Source #
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.
Instances
| Readable Bool Source # | |
| Readable Double Source # | |
| Readable Float Source # | |
| Readable Int Source # | |
| Readable Int8 Source # | |
| Readable Int16 Source # | |
| Readable Int32 Source # | |
| Readable Int64 Source # | |
| Readable Integer Source # | |
| Readable Word8 Source # | |
| Readable Word16 Source # | |
| Readable Word32 Source # | |
| Readable Word64 Source # | |
| Readable ByteString Source # | |
| Readable Text Source # | |