[Click] compound element keyword arguments

[Douglas S. J. De Couto]

re: perl -w

i don't really care, but as far as i can tell the only reason you would 
ever give click empty arguments in an argument list is that you made a 
mistake somewhere.

therefore, click should tell you there was a mistake.

(tounge in cheek, but only partly)  : maybe there should be a click 
pre-processor?

On 17 Mar 2004, at 02:37, Eddie Kohler wrote:

> Hi all,
>
> Click compound elements now support keyword arguments and "rest" 
> arguments.
>
> Examples:
>
>    elementclass Foo {
>      input -> Print -> output     /* no arguments */
>    ||
>      $a | input -> Print($a) -> output   /* one positional argument */
>    ||
>      COLOR $t | input ->  Print($t) -> output  /* a keyword argument */
>    ||
>      $a, TS $c, __REST__ $rest |    /* 1 positional, 1 keyword, 1 rest 
> */
>         input -> Print($a, TIMESTAMP $c, $rest) -> output
>    }
>
>    Foo();   /* uses definition 1 */
>    Foo(what);   /* uses 2 with $a == 'what' */
>    Foo(COLOR red);  /* uses 3 with $t == 'red' */
>    Foo(money, whatever, TS true, OTHER foo)
> 	      /* uses 4 with $a == 'money', $c == 'true', and
> 		 $rest == 'whatever, OTHER foo' */
>
> Compound elemnet keyword arguments are mandatory.  So the following is 
> an
> error, because the MANDATORY keyword is missing:
>
>    { MANDATORY $whatever | ... } ();
>
> It turns out that __REST__ arguments work better if empty arguments are
> ignored (I mentioned this in a previous email).  So for now empty 
> arguments
> are ignored.  Doug, how about 'perl -w' for the uninitialized-variable 
> case
> you were mentioning?
>
> Eddie
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>
--
Douglas S. J. De Couto    <decouto at csail.mit.edu>