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Re: [Jsonpath] JSNOPath Interim meeting next week

Carsten Bormann <cabo@tzi.org> Mon, 25 April 2022 21:26 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Mon, 25 Apr 2022 23:26:21 +0200
Cc: Tim Bray <tbray@textuality.com>, jsonpath@ietf.org
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To: Stefan Gössner <stefan@goessner.net>
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Subject: Re: [Jsonpath] JSNOPath Interim meeting next week
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> On 25. Apr 2022, at 19:53, Stefan Gössner <stefan@goessner.net> wrote:
> 
> I think, we need to address/discuss ...
> 
> * Filtering object members by index (key), which isn't possible right now. In combination with regular expressions that would be very powerful ($[? @index =~ 'cat|dog') ... avoiding function syntax here.

Syntax:
So the extension point would be @foo for getting a property (English word) of each current node — that makes a lot of sense to me.

Semantics:
We would make a single, explicit exception from the “don’t look up” principle here — I think that such an exception is acceptable specifically for going horizontally from the member value (element) to its name (index).  This just means that the implementation must keep the name/index as context when diving down into a member value/array element.

> * how to deal with functions ... how could an extension point be of help here (length property of objects/arrays) ?

@length works using the same extension point; no function syntax needed.

Grüße, Carsten

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