Snom patch: header value syntax

[pbertera]

Last header value: you can extract the header value using the ! suffix to the [last_headerName]

Example:
To: [last_From!]

will generates a To: header containing the last From header value, this is quite useful when you need to send a new request (Eg. re-INVITE into an inbound SIP dialog)

Of course you can do the same using a regexp, but this syntax simplifies a lot the scenario file.

All the attribution for this patch should go to Snom Technology AG

[wdoekes]

Thanks for the patch with testcase.

Could you make that into [last_From.value] instead, as suggested in #132 ? The code changes you provided aren't as clean as they could be, but I'll wait with reviewing.

And, this lack all documentation, visible and invisible. A possible way to document its existence could be to add it to one of the built-in scenario's...

(Lastly, your commits aren't atomic changes. They'll need to be squashed before I could merge. And the testcase naming should either be github-#XXXX (reference to ticker XXXX on github) or some discriptive name, like last_header_value in which case the "github" makes no sense.)

[pbertera]

Thanks for the feedback,

• about the naming: I agree that using the valuekeyword will make the syntax more clear, I would like to have an opinion about using : as a separator (see Add [last_Header.value] to get only the value part of the last Header #132).
• about the documentation: what about to add a new scenario (uas-req.xml) where the BYE comes from the uas ?

[wdoekes]

I would like to have an opinion about using : as a separator

Sounds good to me. (And it provides more legitimacy for the : being optional like it is right now.)

What about to add a new scenario (uas-req.xml) where the BYE comes from the uas?

I'm a bit reluctant to add new scenario's into the binary itself. If you add it to a samples directory as separate xml file, it would work for me. (Especially if a test case runs it, so the scenario's do not get stale.)

[wdoekes]

Closed in favor of WIP in #260.