[SR-Users] New feature: #defexp -preprocessor define with expression

[Daniel-Constantin Mierla]

Hello,

following the recent new feature of #!ifexp based on snexpr
(https://www.kamailio.org/w/2022/09/ifexp-conditional-preprocessor-blocks/),
another preprocessor directive was added which allows defining IDs with
a value computed from the evaluation of an expression, respectively:

#!defexp ID EXP

The EXP can be any expression supported by snexpr, including the
previously defined IDs. For example:

#!define IPADDR 1.2.3.4
#!define PORT 5060
#!defexp SIPURI "sip:" + IPADDR + ":" + PORT

The result is that SIPURI is defined to sip:1.2.3.4:5060.

Another variant is available as #!defexps, which encloses the result of
the expression in double quotes, making it suitable to be used further
as string value:

#!defexps SIPURI "sip:" + IPADDR + ":" + PORT

The result is that SIPURI is defined to “sip:1.2.3.4:5060”.

More details at:

  - https://www.kamailio.org/wikidocs/cookbooks/devel/core/#defexp
  - https://www.kamailio.org/wikidocs/cookbooks/devel/core/#defexps

Testing would be appreciated, feedback can be addressed to sr-users
mailing list!

Cheers,
Daniel

-- 
Daniel-Constantin Mierla -- www.asipto.com
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