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inc/Spiffy.pm  view on Meta::CPAN

      "  return \$_[0]->{%s} = do { my \$self = \$_[0]; %s }\n" .
      "    unless \$#_ > 0 or defined \$_[0]->{%s};\n",
    weak_init =>
      "  return do {\n" .
      "    \$_[0]->{%s} = do { my \$self = \$_[0]; %s };\n" .
      "    Scalar::Util::weaken(\$_[0]->{%s}) if ref \$_[0]->{%s};\n" .
      "    \$_[0]->{%s};\n" .
      "  } unless \$#_ > 0 or defined \$_[0]->{%s};\n",
    return_if_get => 
      "  return \$_[0]->{%s} unless \$#_ > 0;\n",
    set => 
      "  \$_[0]->{%s} = \$_[1];\n",
    weaken => 
      "  Scalar::Util::weaken(\$_[0]->{%s}) if ref \$_[0]->{%s};\n",
    sub_end => 
      "  return \$_[0]->{%s};\n}\n",
);

sub field {
    my $package = caller;
    my ($args, @values) = do {
        no warnings;
        local *boolean_arguments = sub { (qw(-weak)) };
        local *paired_arguments = sub { (qw(-package -init)) };
        Spiffy->parse_arguments(@_);
    };
    my ($field, $default) = @values;
    $package = $args->{-package} if defined $args->{-package};
    die "Cannot have a default for a weakened field ($field)"
        if defined $default && $args->{-weak};
    return if defined &{"${package}::$field"};
    require Scalar::Util if $args->{-weak};
    my $default_string =
        ( ref($default) eq 'ARRAY' and not @$default )
        ? '[]'
        : (ref($default) eq 'HASH' and not keys %$default )
          ? '{}'
          : default_as_code($default);

    my $code = $code{sub_start};
    if ($args->{-init}) {
        my $fragment = $args->{-weak} ? $code{weak_init} : $code{init};
        $code .= sprintf $fragment, $field, $args->{-init}, ($field) x 4;
    }
    $code .= sprintf $code{set_default}, $field, $default_string, $field
      if defined $default;
    $code .= sprintf $code{return_if_get}, $field;
    $code .= sprintf $code{set}, $field;
    $code .= sprintf $code{weaken}, $field, $field 
      if $args->{-weak};
    $code .= sprintf $code{sub_end}, $field;

    my $sub = eval $code;
    die $@ if $@;
    no strict 'refs';
    *{"${package}::$field"} = $sub;
    return $code if defined wantarray;
}

sub default_as_code {
    require Data::Dumper;
    local $Data::Dumper::Sortkeys = 1;
    my $code = Data::Dumper::Dumper(shift);
    $code =~ s/^\$VAR1 = //;
    $code =~ s/;$//;
    return $code;
}

sub const {
    my $package = caller;
    my ($args, @values) = do {
        no warnings;
        local *paired_arguments = sub { (qw(-package)) };
        Spiffy->parse_arguments(@_);
    };
    my ($field, $default) = @values;
    $package = $args->{-package} if defined $args->{-package};
    no strict 'refs';
    return if defined &{"${package}::$field"};
    *{"${package}::$field"} = sub { $default }
}

sub stub {
    my $package = caller;
    my ($args, @values) = do {
        no warnings;
        local *paired_arguments = sub { (qw(-package)) };
        Spiffy->parse_arguments(@_);
    };
    my ($field, $default) = @values;
    $package = $args->{-package} if defined $args->{-package};
    no strict 'refs';
    return if defined &{"${package}::$field"};
    *{"${package}::$field"} = 
    sub { 
        require Carp;
        Carp::confess 
          "Method $field in package $package must be subclassed";
    }
}

sub parse_arguments {
    my $class = shift;
    my ($args, @values) = ({}, ());
    my %booleans = map { ($_, 1) } $class->boolean_arguments;
    my %pairs = map { ($_, 1) } $class->paired_arguments;
    while (@_) {
        my $elem = shift;
        if (defined $elem and defined $booleans{$elem}) {
            $args->{$elem} = (@_ and $_[0] =~ /^[01]$/)
            ? shift
            : 1;
        }
        elsif (defined $elem and defined $pairs{$elem} and @_) {
            $args->{$elem} = shift;
        }
        else {
            push @values, $elem;
        }
    }
    return wantarray ? ($args, @values) : $args;        
}

inc/Spiffy.pm  view on Meta::CPAN

          : ($_, \ &{"$mixin_class\::$_"})
    } @_ 
      ? (get_roles($mixin_class, @_))
      : (keys %methods);
}

sub get_roles {
    my $mixin_class = shift;
    my @roles = @_;
    while (grep /^!*:/, @roles) {
        @roles = map {
            s/!!//g;
            /^!:(.*)/ ? do { 
                my $m = "_role_$1"; 
                map("!$_", $mixin_class->$m);
            } :
            /^:(.*)/ ? do {
                my $m = "_role_$1"; 
                ($mixin_class->$m);
            } :
            ($_)
        } @roles;
    }
    if (@roles and $roles[0] =~ /^!/) {
        my %methods = spiffy_all_methods($mixin_class);
        unshift @roles, keys(%methods);
    }
    my %roles;
    for (@roles) {
        s/!!//g;
        delete $roles{$1}, next
          if /^!(.*)/;
        $roles{$_} = 1;
    }
    keys %roles;
}

sub spiffy_all_methods {
    no strict 'refs';
    my $class = shift;
    return if $class eq 'Spiffy';
    my %methods = map {
        ($_, $class)
    } grep {
        defined &{"$class\::$_"} and not /^_/
    } keys %{"$class\::"};
    my %super_methods;
    %super_methods = spiffy_all_methods(${"$class\::ISA"}[0])
      if @{"$class\::ISA"};
    %{{%super_methods, %methods}};
}


# END of naughty code.
#===============================================================================
# Debugging support
#===============================================================================
sub spiffy_dump {
    no warnings;
    if ($dump eq 'dumper') {
        require Data::Dumper;
        $Data::Dumper::Sortkeys = 1;
        $Data::Dumper::Indent = 1;
        return Data::Dumper::Dumper(@_);
    }
    require YAML;
    $YAML::UseVersion = 0;
    return YAML::Dump(@_) . "...\n";
}

sub at_line_number {
    my ($file_path, $line_number) = (caller(1))[1,2];
    "  at $file_path line $line_number\n";
}

sub WWW {
    warn spiffy_dump(@_) . at_line_number;
    return wantarray ? @_ : $_[0];
}

sub XXX {
    die spiffy_dump(@_) . at_line_number;
}

sub YYY {
    print spiffy_dump(@_) . at_line_number;
    return wantarray ? @_ : $_[0];
}

sub ZZZ {
    require Carp;
    Carp::confess spiffy_dump(@_);
}

1;

__END__

#line 1066