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Hello,<br>
<br>
<div class="moz-cite-prefix">On 10/9/12 3:59 PM, Andreas Granig
wrote:<br>
</div>
<blockquote cite="mid:50742DDD.1010202@sipwise.com" type="cite">
<pre wrap="">Hi,
I'm playing around with xavp, but there are some things I can't wrap my
head around.
What basically works is this:
$xavp(a=>foo) = 'foo';
$xavp(a[0]=>bar) = 'bar';
Getting the value like this:
xlog("L_INFO", "a-foo='$xavp(a=>foo)' and a-bar='$xavp(a=>bar)'");
as well as
xlog("L_INFO", "a-foo='$xavp(a[0]=>foo)' and a-bar='$xavp(a[0]=>bar)'");
... works, because when omitting the index, it assumes [0]. I really
like to avoid such implicit assumptions though, to make the config
really clear, so I prefer the second approach.
What doesn't work for me then is explicit assignment of the very first
value, like this:
$xavp(a[0]=>foo) = 'foo';
$xavp(a[0]=>bar) = 'bar';
If I do this, the "a" xavp is never created. Wouldn't it be good
practice to create the xavp on first assignment? That way, I don't have
to take care in the config file whether the xavp is used for the first
time, where I have to omit the index.</pre>
</blockquote>
<br>
xavps are reusing the avps architecture in regards of working as a
stack. So last added is first in the list.<br>
<br>
The problem of creating the structure when providing the index is
also related to it. What should happen if one does:<br>
<br>
<pre wrap="">$xavp(a[5]=>foo) = 'foo';</pre>
<br>
Create other 5 xavps named 'a' (indexes 0 to 4)?<br>
<br>
It seemed the right approach not to create new structures at invalid
position, by simply not providing the position. For overwriting a
value, the index has to be provided.<br>
<br>
The xavps system was under rfc at some point:<br>
<a class="moz-txt-link-freetext" href="http://lists.sip-router.org/pipermail/users/2009-July/024180.html">http://lists.sip-router.org/pipermail/users/2009-July/024180.html</a><br>
<br>
Of course, it can be adjusted when something can be better, for the
moment I don't see a solution to this case, unless a new operator is
introduced.<br>
<br>
<blockquote cite="mid:50742DDD.1010202@sipwise.com" type="cite">
<pre wrap="">
What I'm also wondering is whether it's possible to directly access
nested xavps, like this:
$xavp(a=>foo) = 'afoo';
$xavp(b=>foo) = 'bfoo';
$xavp(c=>a) = $xavp(a);
$xavp(c=>b) = $xavp(b);
xlog("L_INFO", "a-foo='$xavp(c=>a[0]=>foo)'");
or
xlog("L_INFO", "a-foo='$xavp(c=>a=>foo)'");
Both ways give me "a-foo='<<xavp:0x7f0d387fe178>>'". Is this even
intended? Would be really cool if that's possible!</pre>
</blockquote>
Internally it is possible to have as many nested xavps (the value
for an xavp can be a list of xavps). At this moment, the config file
syntax has support only for two levels, your example is returning
the value of c=>a, which is a pointer to another xavp list.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<blockquote cite="mid:50742DDD.1010202@sipwise.com" type="cite">
<pre wrap="">
Thanks,
Andreas
</pre>
<br>
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<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla - <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a></pre>
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