As Parse::RecDescent gets its grammar as a string, I see no way to create clever closures or anything that will allow you to use lexical variables. One approach I can think of would be judicious use of local to isolate the effects, but that implies that your parsers won't call each other recursively:

...
sub do_parse {
    local $parser_info = {
        tokens => [],
    };
    my $p6 = Parse::RecDescent->new(q{
        {
            push @{ $parser_info->{tokens} }, $item{letter}
        }
    });
};
...

[download]

That way, you reduce your need for a global variable to one entry point, $parser_info. I think you can also instruct Parse::RecDescent to return you the whole parse tree as an AST instead of having it execute code immediately, by using the <autotree> directive. That wouldn't require any code within your parser, but you have to walk the tree yourself after it has been constructed.

In reply to Re: scope issues in Parse::RecDescent by Corion
in thread scope issues in Parse::RecDescent by citromatik

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