PYANG does much of what you request if you ask for a tree, jstree output. It probably could create a yang output with some work. Balazs
From: Andy Bierman [mailto:a...@yumaworks.com] Sent: Tuesday, 04 October, 2016 18:56 To: Balázs Lengyel <balazs.leng...@ericsson.com> Cc: netmod@ietf.org Subject: Re: [netmod] deviation-stmt (7.20.3) On Fri, Sep 30, 2016 at 9:01 AM, Balazs Lengyel <balazs.leng...@ericsson.com<mailto:balazs.leng...@ericsson.com>> wrote: My biggest problem with deviations is that a number of things can not be deviated: * description * reference This does seem quite useful. I wonder why it got left out. The way deviations work is rather counter-intuitive to those of us who think of deviations as source code patches. Almost all deviations are source code patches, except type-stmt, and some default-stmt replacements. It would be nice if a YANG tool could process all the deviations advertised by the server and produce a set of valid "deviated modules" which could then be fed to a YANG compiler that did not support deviations. This is non-trivial and not always possible, because of the type-stmt and possible import loops. Regards Balazs Andy On 2016-09-30 00:22, Andy Bierman wrote: Hi, The deviation section has a lot of fluff text about how bad deviations are, but very little text on how to process the "deviate" statement correctly. The text is not clear if the statements altered in the target module are semantic patches or syntactic patches. Are the sub-statements of the deviate-stmt fully processed in the scope of the deviation module or in the scope of the target module? In this example, is the type-stmt resolved in A or dev-A? Similar issues for deviating a default for an identityref. module A { namespace "..."; prefix a; // no imports! leaf foo { type string; } leaf bar { type string; } leaf baz { type string; } } module A-dev { ... import A { prefix a; } import C { prefix c; } import ietf-interfaces { prefix if; } // variant 1: inline leafref but module A does not import path module deviation /a:foo { deviate replace { type leafref { base /c:modules/c:module/c:name; } } } // variant 2: imported typedef but module A does not import it deviation /a:bar { deviate replace { type if:interface-ref; } } // variant 3: local typedef but module A cannot import it (circular imports) typedef mystring { type string { length "1..10"; } } deviation /a:baz { deviate replace { type mystring; } } } Andy _______________________________________________ netmod mailing list netmod@ietf.org<mailto:netmod@ietf.org> https://www.ietf.org/mailman/listinfo/netmod -- Balazs Lengyel Ericsson Hungary Ltd. Senior Specialist Mobile: +36-70-330-7909 email: balazs.leng...@ericsson.com<mailto:balazs.leng...@ericsson.com>
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