[systemd-devel] [PATCH 2/5] shared/json: JSON parser + number tokenizer bugfix

Lennart Poettering lennart at poettering.net
Fri May 15 07:12:52 PDT 2015

On Fri, 15.05.15 16:03, Pavel Odvody (podvody at redhat.com) wrote:

> On Fri, 2015-05-15 at 15:23 +0200, Lennart Poettering wrote:
> > On Thu, 07.05.15 17:47, Pavel Odvody (podvody at redhat.com) wrote:
> > 
> > Hmm, so if I grok this right, then this at's a DOM-like ("object
> > model") parser for json, where we previously hat a SAX-like ("stream")
> > parser only. What's the rationale for this? Why doesn't the stream
> > parser suffice?
> > 
> > I intentionally opted for a stream parser when I wrote the code, and
> > that#s actually the primary reason why i roleld my own parser here,
> > instead of using some existing library....
> > 
> Hmm, I'd call it lexer/tokenizer, since the burden of syntactic analysis
> is on the user. The parser is actually rather thin wrapper around
> json_tokenize.
> Rationale: the v2 manifest (also) contains embedded JSON documents and
> is itself versioned, so it will change sooner or later.
> I believe that parsing the manifest, or any "decently" complex JSON
> document, using the stream parser would yield equal or bigger chunk of
> code than generic DOM parser + few lines that consume it's API.

Can you give an example of these embedded JSON documents?

Couldn't this part be handled nicely by providing a call that skips
nicely over json objects we don't want to process?


Lennart Poettering, Red Hat

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