It looks like you've implemented everything as a class method.

Here's a jot of example code. 

# ClassName->method( @args );   # class method
# $object_ref->method( @args ); # instance method

# calling your constructor.
my $o = MyOptions->new(      
    Usage => 'Do what I say, not what I do!',
    Options => [
        { Name => 'Foo', Type => 'Bar', Etc => 'Blah' },
        { Name => 'Bar', Type => 'Baz', Etc => 'Blah' },
    ],
);

$o->print_usage;

MyOptions->debug(1);  # having problems here.  Enabling debug mode.
my $chickens = $o->count_your_chickens($eggs);
MyOptions->debug(0);


my $parsed_ok = $o->parse_args( @ARGV );

package MyOptions;
use const OPTIONS => 0, 

my $DEBUG;

sub debug {
   my $old = $DEBUG;    

   if ( @_ ) {
       my $old = $DEBUG;    
       $DEBUG = shift;
       $Carp::Verbose = $DEBUG;
   }

   return $old;
}

sub new {
    my $class = shift;
    my %args = @_;

    my $self = [];
    bless $self, $class;
    
    $self->set_usage( $args{Usage} );
    $self->add_options( @{ $args{Options} || [] } );

    return $self;
}

sub set_usage {
    my $self = shift;

    check_args(@_,1);
  
    my $old_usage = $self->[USAGE];  
    $self->[USAGE] = shift;
    return $old_usage;
}

sub add_options {
    my $self = shift;

    foreach my $opt (@_) {         
         my $opt_obj = $self->OptionFactory( $opt );
         next unless $opt_obj;

         my $name = $opt_obj->get_name;
         $self->[OPTIONS]{ $name } = $opt_obj;
    }
    
    return keys %{$self->[OPTIONS]||{}};
}

sub OptionFactory {
   my $self = shift;
   my $opt  = shift;

   # make an option object from the specification passed in.
   # unless $opt is already an option object.  Then return.
   # if opt is inavalid spec - return undef
   my $obj = UNIVERSAL::isa( 'MyOption', $opt ) 
             ? $opt 
             : MyOption->new();

   return $obj;
}

[download]

I can't recommend thedamian's Object Oriented Perl enough. Very good for the OOP newbie. It covers concepts of OO and interesting Perl techniques, mostly along the lines of classical Perl OO.

If you want to do really fancy OO stuff check out Moose. It's all the rage these days. I recommend learning to do the classical style first.


TGI says moo

In reply to Re: A first attempt.. at OO perl by TGI
in thread A first attempt.. at OO perl by why_bird

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