File Coverage

blib/lib/Package/Generator.pm

Criterion	Covered	Total	%
statement	55	55	100.0
branch	18	18	100.0
condition	11	13	84.6
subroutine	11	11	100.0
pod	3	3	100.0
total	98	100	98.0

use strict;
use warnings;
package Package::Generator;
{
  $Package::Generator::VERSION = '1.106';
}
use 5.008;
# ABSTRACT: generate new packages quickly and easily

use Carp ();
use Scalar::Util ();


my $i = 0;
my $unique_part = sub { $i++ };
my $make_unique = sub { sprintf "%s::%u", $_[0], $_[1]->() };

sub new_package {
  my ($self, $arg) = @_;
  $arg->{base} ||= 'Package::Generator::__GENERATED__';
  $arg->{unique_part} ||= $unique_part;
  $arg->{make_unique} ||= $make_unique;
  $arg->{max_tries} ||= 1;

  my $package;
  for (my $i = 1; 1; $i++) {
    $package = $arg->{make_unique}->($arg->{base}, $arg->{unique_part});
    last unless $self->package_exists($package);
    Carp::croak "couldn't generate a pristene package under $arg->{base}"
      if $i >= $arg->{max_tries};
  }

  my @data = $arg->{data} ? @{ $arg->{data} } : ();

  push @data, (
    ($arg->{isa} ? (ISA => (ref $arg->{isa} ? $arg->{isa} : [ $arg->{isa} ]))
                 : ()),
    ($arg->{version} ? (VERSION => $arg->{version}) : ()),
  );

  if (@data) {
    $self->assign_symbols($package, \@data);
  } else {
    # This ensures that even without symbols, the package is created so that it
    # will not be detected as pristene by package_exists.  Without this line of
    # code, non-unique tests will fail. -- rjbs, 2006-04-14
    {
      ## no critic (ProhibitNoStrict)
      no strict qw(refs);
      no warnings qw(void);
      %{$package . '::'};
    }
  }

  return $package;
}


sub assign_symbols {
  my ($self, $package, $key_value_pairs) = @_;

  Carp::croak "list of key/value pairs must be even!" if @$key_value_pairs % 2;

  ## no critic (ProhibitNoStrict)
  no strict 'refs';
  while (my ($name, $value) = splice @$key_value_pairs, 0, 2) {
    my $full_name = "$package\:\:$name";

    if (!ref($value) or Scalar::Util::blessed($value)) {
      ${$full_name} = $value;
    } else {
      *{$full_name} = $value;
    }
  }
}


sub package_exists {
  my ($self, $package) = @_;

  return defined *{$package . '::'};
}

# My first attempt!  How silly I felt when I threw in some Data::Dumper and saw
# that the above would suffice. -- rjbs, 2006-04-14
#
#  my @parts = split /::/, $package;
#
#  my $current_pkg = 'main';
#  for (@parts) {
#    my $current_stash = do { no strict 'refs'; \%{$current_pkg . "::"} };
#    return unless exists $current_stash->{$_ . "::"};
#    $current_pkg .= "::$_"
#  }
#  return 1;

1;

__END__