diary2blosxom.pl

• diary2blosxom.pl: 1.7 2004/01/11 04:19:46 ichiki Exp
  • (start): print attributes for HTML tags.
• during writing the above, i learned "reference of hash" in Perl:
  • in HTML::Parser, "attr" is a reference of hash.
  • $attr is passed to the routine "start" as

    sub start
    {
        my ($tagname, $attr) = @_;
        ...
      

  • there, the hash itself can be accessed via %{$attr} as

    while (($a, $c) = each (%{$attr})) {
    ...
    }
      

  • also note that
    • %hash = (a => Z, b => Y, ...);
    • $hashref = {a => Z, b => Y, ...};
    • %hash is equivalent to %{$hashref}
    • $hash{a}, ${$hashref}{a}, $ $hashref{a}, and $hashref->{a} are all Z.