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Re: Static JSON parser for embedded

Subject Re: Static JSON parser for embedded
Newsgroups comp.lang.c, comp.arch.embedd
References <qblnbg$402$1@dont-email.me>
From Clifford Heath <no.spam@please.net>
Message-ID <2hODE.56712$8B4.29775@fx02.iad> (permalink)
Date 2019-05-18 17:14 +1000

Cross-posted to 2 groups.

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On 17/5/19 5:20 pm, pozz wrote:
> I'd like to use JSON documents in my embedded project. I don't need full 
> parsing capabilities, because JSON could be very complex in general.
> 
> Do you know of something code generator?

Ok. Latecomer, but I read most of the thread. Introduction: I've been 
writing C since 1979 and have a million lines of my code in production 
in mission-critical software on tens of millions of enterprise 
computers. Although these days my C is mostly C++, I use C++ mostly for 
the features that make it "a better C".

Neither JSON nor C has a very strong type system. Neither is a good 
specification language. You should choose a specification language that 
does a good job of specifying your intent, and a compiler for it that 
emits C that handles one or more packing syntaxes such as JSON (if you 
must!)

The European Space Agency has followed the lead of the ISO networking 
standards and built a compiler for ASN.1, which emits C code targeted at 
static-memory embedded systems. The downside: I don't think it has a 
JSON packing rule (the ASN.1 name for a transfer syntax). Other ASN.1 
compilers do support JSON, but I don't know whether they target 
static-memory or embedded systems.

The ESA-funded ASN1CC is here: <https://github.com/ttsiodras/asn1scc>.

It supports BER (Basic encoding rules, a compact & fast binary format), 
PER (Packed Encoding Rules, a bit-packed binary format that will be 
slower but tighter), XER (XML Encoding Rules, you can imagine!), and 
ACN, where you get to define the encoding yourself.

If you wish to serve the community as well as yourself, write JER, JSON 
Encoding Rules and submit it.

A quick search finds a proposed standard: 
<https://www.obj-sys.com/docs/JSONEncodingRules.pdf> and a tool that 
analyses a JSON fragment and produces a proposed ASN.1 definition for 
the shape of the fragment <https://asn1.io/json2asn/>

So there is existing work, and no doubt community support for more.
You could do a lot worse than start with ASN1CC.

Clifford Heath.

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Thread

Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 09:20 +0200
  Re: Static JSON parser for embedded Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-05-17 08:48 +0000
    Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 11:06 +0200
      Re: Static JSON parser for embedded Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-05-17 11:22 +0000
        Re: Static JSON parser for embedded Thiago Adams <thiago.adams@gmail.com> - 2019-05-17 04:40 -0700
          Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 14:10 +0200
            Re: Static JSON parser for embedded Thiago Adams <thiago.adams@gmail.com> - 2019-05-17 05:18 -0700
              Re: Static JSON parser for embedded Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-05-18 18:18 +0000
        Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 14:10 +0200
          Re: Static JSON parser for embedded Jorgen Grahn <grahn+nntp@snipabacken.se> - 2019-05-18 18:22 +0000
  Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 11:39 +0100
    Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 13:19 +0200
      Re: Static JSON parser for embedded Thiago Adams <thiago.adams@gmail.com> - 2019-05-17 05:09 -0700
        Re: Static JSON parser for embedded Thiago Adams <thiago.adams@gmail.com> - 2019-05-17 05:15 -0700
      Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 15:06 +0100
        Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 16:37 +0200
          Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 17:56 +0100
            Re: Static JSON parser for embedded "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-05-17 10:21 -0700
              Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 18:43 +0100
                Re: Static JSON parser for embedded Thiago Adams <thiago.adams@gmail.com> - 2019-05-17 10:58 -0700
                Re: Static JSON parser for embedded "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-05-17 11:16 -0700
                Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 19:43 +0100
                Re: Static JSON parser for embedded "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-05-17 11:57 -0700
                Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 20:11 +0100
                Re: Static JSON parser for embedded "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-05-17 12:22 -0700
                Re: Static JSON parser for embedded Ben Bacarisse <ben.usenet@bsb.me.uk> - 2019-05-17 21:33 +0100
                Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-18 00:11 +0200
            Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-17 22:33 +0100
              Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-18 00:17 +0200
                Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-18 01:25 +0100
            Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-17 23:43 +0200
  Re: Static JSON parser for embedded Thiago Adams <thiago.adams@gmail.com> - 2019-05-17 04:38 -0700
  Re: Static JSON parser for embedded "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-05-17 07:38 -0700
    Re: Static JSON parser for embedded Malcolm McLean <malcolm.arthur.mclean@gmail.com> - 2019-05-17 08:05 -0700
      Re: Static JSON parser for embedded "Rick C. Hodgin" <rick.c.hodgin@gmail.com> - 2019-05-17 08:15 -0700
      Re: Static JSON parser for embedded Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2019-05-17 11:53 -0400
  Re: Static JSON parser for embedded Ian Collins <ian-news@hotmail.com> - 2019-05-18 15:33 +1200
    Re: Static JSON parser for embedded Bart <bc@freeuk.com> - 2019-05-18 11:57 +0100
  Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-05-18 17:14 +1000
    Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-05-18 16:03 +0200
      Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-05-19 09:12 +1000
        Re: Static JSON parser for embedded Niklas Holsti <niklas.holsti@tidorum.invalid> - 2019-05-19 17:13 +0300
          Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-05-20 09:25 +1000
        Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-06 11:12 +0200
          Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-07 09:11 +1000
            Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-07 08:59 +0200
              Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-12 09:41 +1000
    Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-05 16:44 +0200
      Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-06 09:27 +1000
        Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-06 09:50 +0200
          Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-07 09:08 +1000
      Re: Static JSON parser for embedded Clifford Heath <no.spam@please.net> - 2019-06-06 09:48 +1000
        Re: Static JSON parser for embedded pozz <pozzugno@gmail.com> - 2019-06-06 09:54 +0200

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