add _compile_code, a wrapper for _eval_closure and _add_line_directive

[gitmo/Class-MOP.git] / lib / Class / MOP / Method / Generated.pm

package Class::MOP::Method::Generated;

use strict;
use warnings;

use Carp 'confess';

our $VERSION   = '0.75';
$VERSION = eval $VERSION;
our $AUTHORITY = 'cpan:STEVAN';

use base 'Class::MOP::Method';

sub new {
    my $class   = shift;
    my %options = @_;  
        
    ($options{package_name} && $options{name})
        || confess "You must supply the package_name and name parameters $Class::MOP::Method::UPGRADE_ERROR_TEXT";     
        
    my $self = $class->_new(\%options);
    
    $self->initialize_body;
    
    return $self;
}

sub _new {
    my $class = shift;
    my $options = @_ == 1 ? $_[0] : {@_};

    $options->{is_inline} ||= 0;
    $options->{body} ||= undef;

    bless $options, $class;
}

## accessors

sub is_inline { $_[0]{is_inline} }

sub definition_context { $_[0]{definition_context} }

sub initialize_body {
    confess "No body to initialize, " . __PACKAGE__ . " is an abstract base class";
}

sub _eval_closure {
    # my ($self, $captures, $sub_body) = @_;
    my $__captures = $_[1];
    eval join(
        "\n",
        (map {
            /^([\@\%\$])/
                or die "capture key should start with \@, \% or \$: $_";
            q!my !.$_.q! = !.$1.q!{$__captures->{'!.$_.q!'}};!;
        } keys %$__captures),
        $_[2]
    );
}

sub _add_line_directive {
    my ( $self, %args ) = @_;

    my ( $line, $file );

    if ( my $ctx = ( $args{context} || $self->definition_context ) ) {
        $line = $ctx->{line};
        if ( my $desc = $ctx->{description} ) {
            $file = "$desc defined at $ctx->{file}";
        } else {
            $file = $ctx->{file};
        }
    } else {
        ( $line, $file ) = ( 0, "generated method (unknown origin)" );
    }

    my $code = $args{code};

    # if it's an array of lines, join it up
    # don't use newlines so that the definition context is more meaningful
    $code = join(@$code, ' ') if ref $code;

    return qq{#line $line "$file"\n} . $code;
}

sub _compile_code {
    my ( $self, %args ) = @_;

    my $code = $self->_add_line_directive(%args);

    $self->_eval_closure($args{environment}, $code);
}

1;

__END__

=pod

=head1 NAME 

Class::MOP::Method::Generated - Abstract base class for generated methods

=head1 DESCRIPTION

This is a C<Class::MOP::Method> subclass which is used interally 
by C<Class::MOP::Method::Accessor> and C<Class::MOP::Method::Constructor>.

=head1 METHODS

=over 4

=item B<new (%options)>

This creates the method based on the criteria in C<%options>, 
these options are:

=over 4

=item I<is_inline>

This is a boolean to indicate if the method should be generated
as a closure, or as a more optimized inline version.

=back

=item B<is_inline>

This returns the boolean which was passed into C<new>.

=item B<initialize_body>

This is an abstract method and will throw an exception if called.

=back

=head1 AUTHORS

Stevan Little E<lt>stevan@iinteractive.comE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2006-2008 by Infinity Interactive, Inc.

L<http://www.iinteractive.com>

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

=cut