lcd4linux-users

[lcd4linux] Evaluating conditional expression on strings

[yvecai <yv...@gm...>]

Hi all, I'm new to the list.
I would like to be able to set a certain icon 'visible' if Xmms is 
playing, stopped or paused.
The Xmms plugin provide gather this information as strings 'Playing', 
'Stopped' or 'Paused' from a text file xmms-info.

In my example,
    visible xmms(Status)=='Playing'?0:1
desn't work: the conditional test 'a'=='b'?0:1 desn't seem to work if 
'a' and 'b' are strings.

A try to affect values to variables calls Playing or stopped, with no 
results either.

Any ideas?

Re: [lcd4linux] Evaluating conditional expression on strings

[Michael R. <mi...@re...>]

> In my example,
>     visible xmms(Status)=='Playing'?0:1
> desn't work: the conditional test 'a'=='b'?0:1 desn't seem to work if 
> 'a' and 'b' are strings.

You are right: the operators '==' and '<>' are working on numbers only 
(same as it is in Perl)

Adding 'perlish' string tests 'eq' and 'ne' isn't that easy, for the 
evaluator does not support alphanumeric operator tokens.

Hmmm....

any ideas anyone? Is there a senseful operator token for string compare?

probably the tilde? a ~ b (equal) or a !~ b (not equal) ???


bye, Michael


-- 
Michael Reinelt <mi...@re...>
http://home.pages.at/reinelt
GPG-Key 0xDF13BA50
ICQ #288386781

Re: [lcd4linux] Evaluating conditional expression on strings

[yvecai <yv...@gm...>]

I would go for the tilde!

Michael Reinelt a écrit :
>> In my example,
>>     visible xmms(Status)=='Playing'?0:1
>> desn't work: the conditional test 'a'=='b'?0:1 desn't seem to work if 
>> 'a' and 'b' are strings.
>
> You are right: the operators '==' and '<>' are working on numbers only 
> (same as it is in Perl)
>
> Adding 'perlish' string tests 'eq' and 'ne' isn't that easy, for the 
> evaluator does not support alphanumeric operator tokens.
>
> Hmmm....
>
> any ideas anyone? Is there a senseful operator token for string compare?
>
> probably the tilde? a ~ b (equal) or a !~ b (not equal) ???
>
>
> bye, Michael
>
>

Re: [lcd4linux] Evaluating conditional expression on strings

[Michael R. <mi...@re...>]

Well, this is probably years ago, but... but... but...

lcd4linux now supports alphanumeric operators, and there are string
operators like 'eq', 'ne', 'gt', ....

it was easy... (as it#s always easy as soon a you think twice about it)


yvecai schrieb:
> I would go for the tilde!
> 
> Michael Reinelt a écrit :
>>> In my example,
>>>     visible xmms(Status)=='Playing'?0:1
>>> desn't work: the conditional test 'a'=='b'?0:1 desn't seem to work if
>>> 'a' and 'b' are strings.
>>
>> You are right: the operators '==' and '<>' are working on numbers only
>> (same as it is in Perl)
>>
>> Adding 'perlish' string tests 'eq' and 'ne' isn't that easy, for the
>> evaluator does not support alphanumeric operator tokens.
>>
>> Hmmm....
>>
>> any ideas anyone? Is there a senseful operator token for string compare?
>>
>> probably the tilde? a ~ b (equal) or a !~ b (not equal) ???
>>
>>
>> bye, Michael
>>
>>
> 
> 
> 

-- 
Michael Reinelt <mi...@re...>
http://home.pages.at/reinelt
GPG-Key 0xDF13BA50
ICQ #288386781