[Asterisk-Dev] Oh what could the if-then-else syntax in AEL b e?

[Watkins, Bradley]

I believe you have misinterpreted the example.

The example, verbatim, is:

context conditional {
        _8XXX => {
                Dial(SIP/${EXTEN});
                if (${DIALSTATUS} = "BUSY") {
                        Voicemail(${EXTEN}|b);
                } else
                        Voicemail(${EXTEN}|u);
        };
        _777X => {
                switch (${EXTEN}) {
                        case 7771:
                                NoOp(You called 7771!);
                                break;
                        case 7772:
                                NoOp(You called 7772!);
                                break;
                        case 7773:
                                NoOp(You called 7773!);
                                // fall through
                        default:
                                NoOp(In the default clause!);
                };
        };
};

If you start counting the opening and closing brackets you'll quickly
realize that the }; is the delimiter for the extension _8XXX and not for the
if-else clause.  That would be why the first message you got stated you had
too many closing brackets.  In the second try you first delimited the if
clause with }; and then tried to call the application else which obviously
does not exist.

So the actual if-else syntax is:

if ${DIALSTATUS} = "BUSY") {
                         Voicemail(${EXTEN}|b);
		} else
                         Voicemail(${EXTEN}|u);

Hope that helps,
- Brad

-----Original Message-----
From: asterisk-dev-bounces at lists.digium.com
[mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Brian Capouch
Sent: Wednesday, July 06, 2005 4:19 AM
To: Asterisk Developers Mailing List
Subject: [Asterisk-Dev] Oh what could the if-then-else syntax in AEL be?


The parser doesn't like the example in README.ael:

if (${DIALSTATUS} = "BUSY") {
                         Voicemail(${EXTEN}|b);
		} else
                         Voicemail(${EXTEN}|u);
         };



Jul  6 03:10:36 WARNING[4125]: pbx_ael.c:129 __grab_token: Syntax error 
at line 18 of 'extensions.ael', too many closing braces!
     -- Added extension 's' priority 7 to macro-std-exten-ael
     -- Added extension 's' priority 8 to macro-std-exten-ael
     -- Added extension 's' priority 6 to macro-std-exten-ael Jul  6
03:10:36 NOTICE[4125]: pbx_ael.c:1114 handle_root_token: Unknown 
root token 'switch(${DIALSTATUS}) '
Jul  6 03:10:36 NOTICE[4125]: pbx_ael.c:1114 handle_root_token: Unknown 
root token 'catch'
Jul  6 03:10:36 WARNING[4125]: pbx_ael.c:129 __grab_token: Syntax error 
at line 33 of 'extensions.ael', too many closing braces!
Jul  6 03:10:36 NOTICE[4125]: pbx_ael.c:1114 handle_root_token: Unknown 
root token '}'

***************

Maybe it should be like C, with an open brace ahead of the else clause:

  if (${DIALSTATUS} = "BUSY") {
                          Voicemail(${EXTEN}|b);
                 } else {
                  Voicemail(${EXTEN}|u)
	};

Parser doesn't like that one, either:
Jul  6 03:12:12 WARNING[4125]: pbx_ael.c:129 __grab_token: Syntax error 
at line 33 of 'extensions.ael', too many closing braces!
******************

So, I can get the parser to shut up if I put a semicolon after the if() 
part statement:
  if (${DIALSTATUS} = "BUSY") {
                          Voicemail(${EXTEN}|b);
                 }; else {
                  Voicemail(${EXTEN}|u);
                 };

(Ahhhh.)

Only problem is, now the parser things the if() statement ends after the 
if() part, so at runtime Asterisk wonders what application "else" might be:
Jul  6 03:14:40 WARNING[4269]: pbx.c:1648 pbx_extension_helper: No 
application 'else' for extension (macro-std-exten-ael, s, 9)

********************

Something is borked, I fear. . . I'm pounding on it, but so far several 
hours of changing things around in extensions.ael still yield me no joy.

B.





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