[Haskell-cafe] [ANN] stdio-

Dong Han winterland1989 at gmail.com
Wed May 15 11:24:23 UTC 2019

Dear Haskellers,

Today I'm very happy to announce a new beta version of stdio is released on
hackage <http://hackage.haskell.org/package/stdio>, there're some large
additions in this version:


   Add UDP module.

   Add JSON module.

   Add ToText class to Std.Data.TextBuilder module.

The largest addition is a new JSON module, features full RFC 8259 compliance
<https://github.com/haskell-stdio/JSONTestSuite> and 2~3x faster performance
<https://github.com/haskell-stdio/stdio/tree/master/bench/json>. Try to
bring big improvements over a very mature library like aeson is not an easy
task, parts of the improvements come from faster Parser and Builder
in stdio. But we also made a few other improvements:


   To improve building lookup table during JSON parsing(and many other
   formats as well), An ordered map module based on sorted vectors and
   binary-search is also added, there're actually four modules providing
   similar functions to containers:





These data structures have different time and memory characteristics from
tree-based ones, and suits some situations better, e.g. intermediate lookup


   To improve JSON string parsing, we made an UTF-8 validation state
   machine with JSON unescaping logic built-in written in C, combine with the
   ability to scan a whole chunk of input(provided by our new Parser,
   namely scanChunks), we now have faster JSON string parsing performance
   than some native code(JSON.parse from nodejs).

   Numeric parsing is also improved, e.g. we changed Integer decoding loop
   to use machine words if range permits, then covert the result to
Integer rather
   than use Integer all the time.

There're also lots of improvements and simplifications contribute to faster
performance. Overall this is good proof that our new Parser and
Builder infrastructures
work well.

Besides the JSON module, another important addition is the ToText class in
Std.Data.TextBuilder, which is also derivable via generics. The format is
chosen to follow Show class as much as possible, this is a very handy class
when you need to quickly turn something into a builder or text.

A UDP module is added quite easily since the IO manager part is in place.
Due to the message based nature, the API is quite different from TCP,
design suggestions are welcomed!

Happy hacking!


Han Dong
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