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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__ =pod =encoding UTF-8 =head1 NAME Package::Generator - generate new packages quickly and easily =head1 VERSION version 1.106 =head1 SYNOPSIS use Package::Generator; my $package = Package::Generator->new_package; ... =head1 DESCRIPTION This module lets you quickly and easily construct new packages. It gives them unused names and sets up their package data, if provided. =head1 INTERFACE =head2 new_package my $package = Package::Generator->new_package(\%arg); This returns the newly generated package. It can be called with no arguments, in which case it just returns the name of a pristene package. The C<base> argument can be provided to generate the package under an existing namespace. A C<make_unique> argument can also be provided; it must be a coderef which will be passed the base package name and returns a unique package name under the base name. A C<data> argument may be passed as a reference to an array of pairs. These pairs will be used to set up the data in the generated package. For example, the following call will create a package with a C<$foo> set to 1 and a C<@foo> set to the first ten counting numbers. my $package = Package::Generator->new_package({ data => [ foo => 1, foo => [ 1 .. 10 ], ] }); For convenience, C<isa> and C<version> arguments may be passed to C<new_package>. They will set up C<@ISA>, C<$VERSION>, or C<&VERSION>, as appropriate. If a single scalar value is passed as the C<isa> argument, it will be used as the only value to assign to C<@ISA>. (That is, it will not cause C<$ISA> to be assigned; that wouldn't be very helpful.) =head2 assign_symbols Package::Generator->assign_symbols($package, \@key_value_pairs); This routine is used by C<L</new_package>> to set up the data in a package. =head2 package_exists ... if Package::Generator->package_exists($package); This method returns true if something has already created a symbol table for the named package. This is equivalent to: ... if defined *{$package . '::'}; It's just a little less voodoo-y. =head1 AUTHOR Ricardo SIGNES <rjbs@cpan.org> =head1 COPYRIGHT AND LICENSE This software is copyright (c) 2005 by Ricardo SIGNES. This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself. =cut
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