Re: [svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[Dr.Ruud]

Larry Wall schreef:
> Dr.Ruud wrote:

>> I would expect
>>
>>   %hash.exists{$key}
>
> Except $foo.bar{$key} is interpreted as $foo.bar().{$key}.  Things
> like "exists" and "delete" need to evaluate the key before calling
> the method in question, not after.

OK.

>> with the shortcut
>>
>>   %hash.:{$key}
>>
>> to test (at run-time) for existance of the element, and expect
>>
>>   %hash.:exists
>>
>> to test (at compile time if possible) for the validity of 'exists',
>> more like
>>
>>   %hash.can('exists');
>>
>>   %hash.has('exists');
>>
>>   %hash.does('exists');
>
> Why would you expect colon to do that?  I don't see the prior art...

I was reading : as TEST (or indeed STATUS, or even STATE), and read the
part ":exists" a "the STATUS (or validity) of exists()", which would
always be true (or >0) because exists() is in the "hash-core".

So "%table.:$key" or "%table.:{$key}" would then be short for
"%table.exists{key}" (assuming exists() to be the default
TEST/STATUS/STATE-method for hash).

-- 
Affijn, Ruud

"Gewoon is een tijger."

Re: [svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[Larry Wall]

On Fri, Feb 02, 2007 at 08:14:53PM +0100, Dr.Ruud wrote:
: I would expect
: 
:   %hash.exists{$key}
: 

Except $foo.bar{$key} is interpreted as $foo.bar().{$key}.  Things like
"exists" and "delete" need to evaluate the key before calling the method
in question, not after.

: with the shortcut
: 
:   %hash.:{$key}
: 
: to test (at run-time) for existance of the element, and expect
: 
:   %hash.:exists
: 
: to test (at compile time if possible) for the validity of 'exists', more
: like
: 
:   %hash.can('exists');
: 
:   %hash.has('exists');
: 
:   %hash.does('exists');

Why would you expect colon to do that?  I don't see the prior art...

Larry

Re: [svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[Dr.Ruud]

[EMAIL PROTECTED] schreef:

> Just glad someone's reading these things...

Of course we are. But it is hard to react when the syntax isn't in your
muscle memory yet.

>From r13565:

> +%hash.:exists{$key}


I would expect

  %hash.exists{$key}

with the shortcut

  %hash.:{$key}

to test (at run-time) for existance of the element, and expect

  %hash.:exists

to test (at compile time if possible) for the validity of 'exists', more
like

  %hash.can('exists');

  %hash.has('exists');

  %hash.does('exists');

-- 
Affijn, Ruud

"Gewoon is een tijger."

[svn:perl6-synopsis] r13567 - doc/trunk/design/syn

[larry]

Author: larry
Date: Fri Feb  2 09:07:05 2007
New Revision: 13567

Modified:
   doc/trunk/design/syn/S05.pod

Log:
Nick++ noticed where I spaced out.  Just glad someone's reading these things...


Modified: doc/trunk/design/syn/S05.pod
==
--- doc/trunk/design/syn/S05.pod(original)
+++ doc/trunk/design/syn/S05.podFri Feb  2 09:07:05 2007
@@ -728,7 +728,7 @@
 
 If the hash has the property "is parsed(...)", the pattern provided
 is considered to wrap every match, where the key match is represent
-by C and the value matchis represented by C.  (C,
+by C and the value match is represented by C.  (C,
 if present, must come at the beginning.  If omitted, the key must be
 explicitly reparsed by this rule or by the value rule.  If C
 is omitted, it is assumed to be at the end.)  The intent of this