$Bill Luebkert wrote:
> Suresh Govindachar wrote:
>
>> Thanks for @{[]} -- it is better than evaluating outside the
>> here doc. This is because the expressions I need to evaluate
>> are fairly complex and the variables involved come from hashes.
>> Moreover, I would like to do assignments inside the here doc
>> that do not show up in $stuff at all, for example:
>>
>> |my $foo = 3;
>> |my %boo=();
>> |
>> |my $stuff = <<EOD;
>> | @{[eval{$boo{hoo1}=5; "remove_me";}]}
>> | Twice $foo is @{[2 * $foo]}
>> | Second line
>> | @{[eval{$boo{hoo2}=2; "remove_me";}]}
>> | Third line says that \$boo{hoo1} is $boo{hoo1}.
>> |EOD
>> |
>> |$stuff =~ s/\s*remove_me\s*$//gm;
>>
>> What is the name for the @{[]} thingie -- how can it be found
>> in perldoc? And is there a way to avoid the remove_me part?
>
> perlfunc scalar
> perlref near end of "Using References" just before "Symbolic references"
I was concerned that I would not be able to remember @{[]} when I
next needed it, but the preceding reference explains how @{[]}
works and so makes it easy to remember. Thanks for the precise
references.
> "remove_me" => '' would be the simple way. You're getting the
> eval result back and have to drop it.
Returning '' works if the here-doc has good stuff to the left of
the @{[]}. But when @{[]} is all by itself, use of '' results in
the here-doc having white lines that are not easily distinguished
from actual white lines in the here-doc. (I tried returning '\b\b'
but it didn't help.)
--Suresh
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