[Petal] [PATCH] quicker attributes

[Fergal Daly]

When dealing with attributes, Petal currently produces code like this

    if (defined $hash->get ('b') and $hash->get ('b') ne '') {
        $res .= "a" . '="' . $hash->get ('b') . '"'
    }

The patch below make it produce code like this

    {
        my $value = $hash->get ('b');
        if (defined($value) and length($value)) {
            $res .= "a=\"$value\""
        }
    }

so $hash->get is only called once instead of 3 times. This patch will only 
apply is you have applied the the patches I posted last week,

F
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