[Haskell-cafe] JSON parser that returns the rest of the string that was not used

Ryan Newton rrnewton at gmail.com
Sun May 29 17:09:54 UTC 2016

As someone who spent many years putting data in S-expression format, it
seems natural to me to write multiple S-expressions (or JSON objects) to a
file, and expect a reader to be able to read them back one at a time.

This seems comparatively uncommon in the JSON world.  Accordingly, it looks
like the most popular JSON parsing lib, Aeson, doesn't directly provide
this functionality.  Functions like decode just return a "Maybe a", not the
left-over input, meaning that you would need to somehow split up your
multi-object file before attempting to parse, which is annoying and error

It looks like maybe you can get Aeson to do what I want by dropping down to
the attoparsec layer and messing with IResult.

But is there a better way to do this?  Would this be a good convenience
routine to add to aeson in a PR?  I.e. would anyone else use this?

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/haskell-cafe/attachments/20160529/8e02842d/attachment.html>

More information about the Haskell-Cafe mailing list