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Re: [Liberty-eiffel] JSON and XML parser -- newbie question

From: Os Paul
Subject: Re: [Liberty-eiffel] JSON and XML parser -- newbie question
Date: Fri, 15 Feb 2019 15:04:58 +0100

Hi Raphael,

I'm really grateful for your quick answer!
Your guidance was a substantial help and I was able to put together something which seemed to be working.
I'm going for a long weekend now without computers and net so I will only have more time to finish this next week.

Best regards,

On Thu, Feb 14, 2019 at 7:37 PM Raphael Mack <address@hidden> wrote:
Hello Paul,

first a warm welcome on this list!

You are right, there are no samples in the tutorial for the JSON lib,
but we have some tests in test/lib/json.

Anyhow, basically you need an error handler:

   on_error (message: ABSTRACT_STRING)
         -- do something with the json-parse-error here

and a

then pass an INPUT_STREAM - which you can create as STRING_INPUT_STREAM
from a STRING - to

The result here will by you JSON structure. This one you can traverse
with an JSON_VISITOR, or if the structure is fixed you can validate
with assignment test the type and then do a forces assignment to the
respective value type.

For the xml I also have to look it up and I have to hurry right now,
will come back later.


Am Mittwoch, den 13.02.2019, 00:21 +0100 schrieb Os Paul:
> Dear Liberty Eiffel Mailing List Members,
> Could anyone send me some examples how to use the JSON parser
> included in Liberty Eiffel (src/lib/json)?
> I was not able to figure out which class to use. I'd mostly like to
> parse JSON from strings returned by C functions.
> I tried to use the XML parser too but got lost totally. Fortunately
> there are examples for this in the package but unfortunately
> those all read the XML from files. I'd like to parse something in
> memory/string. In all of the examples I saw references
> to 'URL'. I traced back these to STREAM but I got stuck there. How
> could I generate URL for something in memory?
> This part of the code in stream.e looked totally cryptic for me:
> --
>    frozen url: URL
>          -- The URL to this stream as resource
>       do
>          Result := url_memory
>          if Result = Void then
>             Result := new_url
>             url_memory := Result
>          end
>       ensure
>          not_void: Result /= Void
>          always_the_same: Result = url
>       end
> -- 
> Any help would be welcome.
> Thanks in advance & best regards,
> Paul
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