[Haskell-cafe] Re: ANNOUNCE: enumerator, an alternative iteratee package

Felipe Lessa felipe.lessa at gmail.com
Sat Aug 21 00:05:53 EDT 2010

On Sat, Aug 21, 2010 at 12:30 AM, John Millikin <jmillikin at gmail.com> wrote:
> Just released 0.2. It has the text IO and codecs module, with support
> for ASCII, ISO-8859-1, UTF-8, UTF-16, and UTF-32. It should be
> relatively easy to add support for codec libraries like libicu or
> libiconv in the future. Both encoding and decoding are incremental, so
> you can (for example) process million-line logfiles in constant space.

I think it would be nice to say in the docs that a constant sized
buffer isn't used.

Alas, Data.Text.IO.hGetLine internally uses Data.Text.concat.  This
means that you need to do an additional copy whenever a newline is not
found in the first buffer.  So there's a performance reason to have an
hGet as well =).

> This also changes the binary enumHandle to use non-blocking IO, as
> recommended by Magnus Therning. I'm embarrassed to admit I still don't
> understand the improvement, exactly, but three people so far have told
> me it's a good idea.

Me neither =).



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