well ... a bit

Well, yeah. The postfix quote is the biggest irritation, but you can just run

   for my $i (reverse 1 .. $#$e) {
      splice @$e, $i-1, 2, ["'", $e->[$i-1]] if $e->[$i] eq "'";
   }
[download]

over each of the arrayrefs.

without commenting on your code ...

there is not only binary vs postfix, also operator precedence and associativity to be respected!

see perlop#Operator-Precedence-and-Associativity

e.g A+B*C must be A+(B*C)

I just presumed Perl rules for the interpretation and was lucky Perl has two level of logical ops allowing me to emulate the postfix negation with an xor.

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!}