use Perl

• Only question (Score:1)

  by koschei (147)

  My only question is: why are you using eval "" rather than eval {} ?

  --
    ---ict / Spoon
  • Re:Only question (Score:1)

    by Beatnik (493)

    Because I need some vars interpolated and some don't. The $params{'sort'} is dynamic.
    • Re:Only question (Score:1)

      by broquaint (2964)

      You still don't need the string eval e.g

      if ($params{sort} eq "date")
      { use Time::Local;
        @messages =
        map  { $_->[0] }
        sort { $a->[1] <=> $b->[1] }
        map  { my ($h,$m,$d,$M,$y) =
          $_->messagedate =~ /^(\d{1,2})\:(\d{1,2})
          (\d{1,2})\/(\d{1,2})\/(\d{4})/;
          [$_,timelocal(0,$m,$h,$d,$M-1,$y) ] }
        @messages; #Schwartzian Magic
      } else
      { @messages =
        sort
        { lc($a->${\$params{sort}}) cmp
          lc($b->${\$

      --
      

      broquaint out
      • Re:Only question (Score:1)

        by Beatnik (493)

        @messages contains a number of objects and I need to call a simple getter. I can't (and shouldn't) access those variables explicitly. So I need the name of that parameter (and yes, I do some checking prior to that eval block). And yes, I am using strict... all of it :P
        • Re:Only question (Score:1)

          by broquaint (2964)

          I still don't need the need for strict. The only bits that are interpolated are the string comparison, which doesn't need to be interpolated, and the methods calls, which again, can live outside a string eval. Or am I missing something?
          

          --
          

          broquaint out
          • Re:Only question (Score:1)

            by Beatnik (493)

            IIRC you can't do method calls based on scalar values within strict. Ofcourse, I still suck at perl ;P
            • Re:Only question (Score:1)

              by broquaint (2964) on 2003.05.20 8:57 (#20297) Journal

              You surely can

              shell> perl -Mstrict -
              
              sub foo { print "i'm in foo\n" }
              my $m = "foo";
              main->$m;
              
              i'm in foo

              This is because we're not violating strict in anyway (not symbolic, not bareword, declared variable).

              With your hash you can do some slippery scalar dereferencing (to keep it all syntactically correct) or just assign the value to a simple scalar e.g

              shell> perl -Mstrict -
              
              sub foo { print "i'm in foo\n" }
              
              my %h = ( method => "foo" );
              my $m = $h{method};
              
              # slippery syntactic shenanigans
              main->${\ $h{method} };
              
              # such a simple scalar
              main->$m;
              
              i'm in foo
              i'm in foo

              
              

              --
              

              broquaint out

              Reply to This

              Parent