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Newsgroups: comp.lang.ada
Date: Thu, 3 Oct 2019 16:53:44 -0700 (PDT)
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Subject: Re: ANN: Simple components for Ada v.4.42
From: onox <denkpadje@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:57246
Date: 2019-10-03T16:53:44-07:00
List-Id: <comp.lang.ada>

On Monday, September 16, 2019 at 8:58:41 AM UTC+2, briot....@gmail.com wrote:
> On Monday, September 16, 2019 at 8:48:36 AM UTC+2, Dmitry A. Kazakov wrote:
> > The new version provides an implementation of JSON (RFC 7158)
> 
> 
> Hi Dmitry,
> I would be curious to know the differences compared to what GNATCOLL.JSON provides, if you know ? It would be nice if the Ada world did not have too many packages competing here.

Uh oh, I've written a JSON parser ([0]) too! Sorry :) It's quite fast, only about 1K SLOC, supports Ada 2012's iterator and indexing syntax, Apache 2.0 license, but it does not handle UTF-8 yet (patches welcome though)

> Various things which I find limiting in GNATCOLL.JSON: performance is not really good because there are a lot of memory allocations

I did some benchmarking of some JSON parsers using a 110 M large .json file from [1]:

- Parsers.JSON choked on it (I used Parsers.Multiline_Source.Stream_IO)

- GNATCOLL.JSON needs about ~ 17 seconds

- json-ada needs about ~ 3 seconds (should be ~ 1 second to be competitive with other languages, patches/advice welcome)

[0] https://github.com/onox/json-ada

[1] https://github.com/kostya/benchmarks#Json