Add %(...) expression to NQP

[Austin_Hastings]

Presently, NQP supports circumfix operators:

$(...) - which requests the .ast of an expression

@(...) - which requests the .list of an expression

Since Captures have both a hash part and a list part, please add

%(...) - which requests the .hash of an expression

[bacek]

JFYI, circumfix $(...) is deprecated.

[Austin_Hastings]

Yes, but $(...) is the one that calls a magic built-in instead of doing something Perl-ish. I suspect the replacement will be for $(...) to invoke EXPR.'scalar' and then have the PAST nodes equate .ast with .scalar.

[pmichaud@…]

On Sat, Sep 26, 2009 at 07:31:46AM -0000, Parrot wrote:
>  Presently, NQP supports circumfix operators:
> 
>  $(...) - which requests the .ast of an expression

This is deprecated -- see TT #459.

>  @(...) - which requests the .list of an expression
> 
>  Since Captures have both a hash part and a list part, please add
> 
>  %(...) - which requests the .hash of an expression

Will do.

Pm

[pmichaud@…]

On Sat, Sep 26, 2009 at 12:12:07PM -0000, Parrot wrote:
>  Yes, but $(...) is the one that calls a magic built-in instead of doing
>  something Perl-ish. I suspect the replacement will be for $(...) to invoke
>  EXPR.'scalar' and then have the PAST nodes equate .ast with .scalar.

The correct replacement is to change occurrences of "$($foo)" to "$foo.ast" .

If/when we retain the $(...) syntax, it will undoubtedly invoke ".item".  

However, invoking .item on Match objects will return the Match object
itself and not any component of the Match object.  The true and
correct way to get at the ast object is to use ".ast".  (At least that's
correct for this year -- can't make any promises about 2010.  :-)

Pm

[jimmy]

compilers/nqp is no longer around. Please use NQP-rx instead, and all the request had been migrated to  http://wiki.github.com/perl6/nqp-rx/requests.