=encoding UTF-8

=head1 NAME

Ruby - Perl interface to Ruby interpreter

=head1 SYNOPSIS

	use Ruby
		':DEFAULT',

		-require  => 'complex',     # load Ruby's library
			     'digest/md5',  # load Ruby's extention

		-function => 'Rational',    # import Ruby's function

		-class    => qw(GC Object), # import Ruby's classes
		-module   => qw(Kernel),    # synonym for -class

		-variable => ['$!' => '$rb_errinfo'],    # $! as $rb_errinfo
		-function => ['String' => 's'],          # String() as &s()
		-class    => ['Config' => 'RubyConfig'], # Config as RubyConfig

		-literal  => 'all',   # literals are overloaded
		-no_literal => 'all',

		-autobox,             # literals are autoboxed
		-no_autobox,

		-eval => <<'EOR', # eval and import 'add()', 'MyObject'
			def add(x,y)
				x.to_f + x.to_f
			end

			class MyObject
				def my_method
					"OK"
				end
			end
	EOR
	;
	use Ruby -all; # -function => ':DEFAULT' && -class => ':ALL' && -literal

	p($Ruby::Version); # => "1.8.6", for example

	p(add(1, 2));           # => 3.0
	p(MyObject->my_method); # => "OK"

	rb_eval(<<'EOS', __PACKAGE__);

		p __PACKAGE__; # => "main"

		Perl::eval("use LWP::Simple");

		# should be Perl's string
		uri = Perl.String("http://www.ruby-lang.org/");
		getprint(uri); # call &LWP::Simple::getprint()
	EOS

	use Ruby -literal;
	# String/Integer/Float are overloaded

	p "foo"->class; # String

	p ref("foo"); # "Ruby::Object"

	10->times(sub{ p @_ });

	p "foo"->upcase;

	use Ruby -autobox;

	[qw(foo bar baz)]->each(sub{ p @_ });


=head1 DESCRIPTION

This module provides an interface to a ruby interpreter that is installed in
your machine.

=head1 IMPORT COMMAND

=over 4

=item -function => functions
=item -variable => global_variables

Imports I<functions> and/or I<global_variables>.

C<-variable> is a synonym for C<-funcion>.

=item -class => classes
=item -module => modules

Installs I<classes> and/or I<modules> of Ruby.

C<-module> is a synonym for C<class>.

=item -all

Does C<< -function => ':DEFAULT', -class => ':ALL', -literal >>.

=item -require => libraries

Loads I<libraries> at the compile time.

=item -eval => source_code

Evals I<source_code>, and imports the classes and functions that are defined
in I<source_code>.

=item -base => base_class

Sets up the is-a relationship with I<base_class>, like C<base.pm>.

=item -literal => [ 'all' | 'string' | 'numeric' | 'integer' | 'float' ]
=item -no_literal

Enables/Disables literal overloading.

=item -autobox
=item -no_autobox

Enables/Disables literal autoboxing.

=back


=head1 INTERPRETER FEATURE

=head2 Constants

These are imported by default.

=over 4

=item true

=item false

=item nil

=back

=head2 Functions

These are imported by default.

=over 4

=item rb_eval(source [, package [, file [, line]]])

Evals I<source> as Ruby code.

If I<package> is suplied, those classes and functions that are defined in
I<source> are imported to I<package> automatically.

=item rb_require(library)

Loads I<library> at the run time.

=item p(...), puts(...)

Equivalent to ruby's C<p()> and C<puts()>.

=item rubyify(perldata)

Rubyifies I<perldata> to use some ruby-like methods.

For example:

	rubyify(\%ENV)->each(sub{
		my($key, $value) = @_;
		puts "$key=$value";
	});


=back

These functions are importable:

=over 4

=item rb_c(class)

=item rb_m(module)

=item rb_e(exeption)

Obtains the defined I<class>, I<module> or I<exeption> object.

=item rb_const(constant)

Obtains the I<constant>.

For example:

	p rb_const(RUBY_VERSION);
	p rb_const(File::Constant);# == rb_c(File::Constant)

=back

=head1 RUBY FUNCTIONS

Those functions defined in Ruby interpreter are importable.

For example:

	use Ruby qw(lambda(&));

	my $lambda = lambda { ... };
	$lambda->(...);


=head1 NOTE

=head2 Continuation, catch/throw

Ruby's C<callcc> and C<catch/throw> will throw C<LocalJumpError>.

=head2 Ruby thread

Ruby threads sometimes cause core dumps.

=head2 Perl thread

Perl threads often cause core dumps.

=head1 BUGS

Maybe there are a lot of bugs.

=head1 SEE ALSO

L<http://www.ruby-lang.org/>

=head1 AUTHOR

Goro Fuji (藤 吾郎) E<lt>gfuji(at)cpan.orgE<gt>

=head1 COPYRIGHT

Copyright (c) Goro Fuji. All rights reserved.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

=cut