asterisk users - May 2009 - How to write custom functions in AEL2 ,

Hi,

I'm using asterisk 1.6.1 and AEL2.
I'm trying to find the best way to write my own custom functions ?


At the moment, I'm using this pattern (extensions.ael) :

context foo {
123 => {
    &myfunc(123456);
    NoOp(${GOSUB_RETVAL});
};

macro myfunc (arg) {
    Return (${arg});
}

1. First, I keep getting warnings like
Warning: file /etc/asterisk/extensions.ael, line 446-446: application call
to Return affects flow of control, and needs to be re-written using AEL if,
while, goto, etc. keywords instead!
and I would like to get rid of them.

2. Secondly, I would like not to use GOSUB_RETVAL  and call a custom
function just like I'm calling other functions with statements like :
123 => {
     NoOp(TOLOWER(fOo BaR));
     NoOp(myfunc(123456));
};


What would you advise me to do ?

Regards
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2009/5/11 Olivier <oza-4h07 at myamail.com>
>
> 2. Secondly, I would like not to use GOSUB_RETVAL  and call a custom
> function just like I'm calling other functions with statements like :
> 123 => {
>      NoOp(TOLOWER(fOo BaR));
>
> Here, I meant
NoOp(read this ${TOLOWER(fOo BaR)});
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________________________________

	From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
	Sent: Monday, May 11, 2009 3:30 AM
	To: Asterisk Users Mailing List - Non-Commercial Discussion
	Subject: [asterisk-users] How to write custom functions in AEL2
,
	
	
	Hi,
	
	I'm using asterisk 1.6.1 and AEL2.
	I'm trying to find the best way to write my own custom functions
?
	
	
	At the moment, I'm using this pattern (extensions.ael) :
	
	context foo {
	123 => {
	    &myfunc(123456);
	    NoOp(${GOSUB_RETVAL});
	};
	
	macro myfunc (arg) {
	    Return (${arg});
	}
	
	1. First, I keep getting warnings like
	Warning: file /etc/asterisk/extensions.ael, line 446-446:
application call to Return affects flow of control, and needs to be
re-written using AEL if, while, goto, etc. keywords instead!
	and I would like to get rid of them.

Unfortunately, AEL does not support using return with a value at the
moment.  There is a patch on Reviewboard that does this, as well as
*simple* direct assignment from an AEL macro return:
http://reviewboard.digium.com/r/114/


	
	2. Secondly, I would like not to use GOSUB_RETVAL  and call a
custom function just like I'm calling other functions with statements
like :
	123 => {
	     NoOp(TOLOWER(fOo BaR));
	     NoOp(myfunc(123456));
	};
	
	What would you advise me to do ?

That requires rather a lot more work than the above patch, but if you
use the direct assignment at least you needn't worry about GOSUB_RETVAL.


Regards,
- Brad

On Mon, May 11, 2009 at 1:30 AM, Olivier <oza-4h07 at myamail.com> wrote:
> Hi,
>
> I'm using asterisk 1.6.1 and AEL2.
> I'm trying to find the best way to write my own custom functions ?
>
>
> At the moment, I'm using this pattern (extensions.ael) :
>
> context foo {
> 123 => {
>     &myfunc(123456);
>     NoOp(${GOSUB_RETVAL});
> };
>
> macro myfunc (arg) {
>     Return (${arg});
> }
>
> 1. First, I keep getting warnings like
> Warning: file /etc/asterisk/extensions.ael, line 446-446: application call
> to Return affects flow of control, and needs to be re-written using AEL if,
> while, goto, etc. keywords instead!
> and I would like to get rid of them.
>
This is easily done. Return() is calling the Return application; 
'return',
however, is the keyword the AEL uses. Note the lack of a capital R at the
beginning of
the word "return". AEL is case sensitive and "Return" is not
equal to
"return".

Also note that, as a previous reply mentions, that return takes no args,
that there is a patch available to upgrade to do that.
You don't need the patch to do what the patch does, tho. But, not having
refreshed my memory on the particulars, I will say
no more!

>
> 2. Secondly, I would like not to use GOSUB_RETVAL  and call a custom
> function just like I'm calling other functions with statements like :
> 123 => {
>      NoOp(TOLOWER(fOo BaR));
>      NoOp(myfunc(123456));
> };
>
>
Again, check your version of Asterisk against whether AEL uses Gosub() to
implement macros.
The AEL2 wiki page on voip-info.org (
http://voip-info.org/wiki/view/Asterisk+AEL2 ) can also
be quite helpful at times!

> What would you advise me to do ?
>
> Regards
>
>
>
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-- 
Steve Murphy
ParseTree Corp
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