[EMAIL PROTECTED] asked
> Damian gave the solution I am studying. I have attached it at
> the bottom. I don't understand the section between the {{ }}. For example:
> { {command => $item[-1]} }
Ok. this is at first glance a bit confusing I agree. The {} brakets are
heavilly used in Perl and have multiple meanings.
The explanation is much easier to grok when you see it in context
> singleline_command:
> '//' /.*/
> { {command => $item[-1]} }
^ ^ ^ ^ ^ ^
| | | | | |
1 2 3 4 2 1
1. The outter {} are a block definition.
2. The inner {} are an anonymous hash creation.
3. This is a "fat comma". => This is syntactically equivelent to a normal
comma, except that Perl treats the object to its left as quoted if
necessary.
4. This access the last element in the @item array. @item contains a list of
the parts that were matched. Negative numbers when used as indexes to an
array refer to the index of the array starting from its end. Thus
$item[-1]==$item[$#item]==$item[@item-1]
So the end result is that this little piece of highly idomatic perl returns
an anonymous hash containing one key 'command' whose value is that of
whatever was matched by /.*/
HTH
Yves
