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Re^2: Using Parse::RecDescent to parse Perl-ish strings without resorting to string eval

by polypompholyx (Chaplain)
on Feb 29, 2008 at 20:08 UTC ( #671279=note: print w/ replies, xml ) Need Help??


in reply to Re: Using Parse::RecDescent to parse Perl-ish strings without resorting to string eval
in thread Using Parse::RecDescent to parse Perl-ish strings without resorting to string eval

Yes, in the original code, there's some fiddling with <skip> (since whitespace has syntactic significance in the grammar), and unescaping of Unicode hex character escapes. I left them out for clarity.

I can probably live with handrolled code that parses its own definition of a double quoted string, since most of the interpolation is unnecessary, but I'm not sure of any way out with regexes: I'd like to be able to do something like:

$text = qr/$text/$modifiers

but $modifiers doesn't interpolate, and I can't think of any easy way to simulate this without having a very large switch statement.


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Re^3: Using Parse::RecDescent to parse Perl-ish strings without resorting to string eval
by ikegami (Pope) on Feb 29, 2008 at 20:20 UTC
    my $mods_p = ''; my $mods_m = ''; ($opts{$_} ? $mods_p : $mods_m) .= $_ for qw( x i s m ); $re = qr/(?$mods_p-$mods_m:$re)/;
      Ah, of course. I am an idiot. ikegami++

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