Re: [RFC PATCH nft] parser: re-try unexpected tokens as symbol expression

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On Tue, Dec 29, 2015 at 10:41:59PM +0100, Florian Westphal wrote:
> nft fails to parse certain corner-cases, for example:
> 
> nft add rule filter input meta rtclassid daddr
> 
> ... as it finds DADDR token.  However, 'daddr' might be a valid
> routing realm listed in iproute2/rt_realms, so this should be allowed.

We should probably have a look at lex "start conditions" [1]. I think
it's possible to disable scanner rules from the parser based on our
context via yy_push_state(), thus the scanner rules are
enabled/disabled. With the patchset I have just posted, we know have a
rule for specific constant rhs of the relational.

[1] https://www.freebsd.org/cgi/man.cgi?query=lex&sektion=1
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