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#!/usr/bin/perl |
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package Verby::Step::Closure; |
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226865
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use Moose; |
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with qw/Verby::Step::Simple/; |
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extends qw(Moose::Object Exporter); |
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our @EXPORT = "step"; |
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our @EXPORT_OK = ( @EXPORT, qw(chain_steps) ); |
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our $VERSION = "0.05"; |
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use overload '""' => 'stringify'; |
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use Class::Inspector; |
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use Carp qw/croak/; |
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use POE; |
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#my $id; |
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#has id => ( |
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# isa => "Int", |
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# is => "ro", |
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# init_arg => undef, |
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# default => sub { ++$id }, |
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#); |
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has pre => ( |
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isa => "CodeRef", |
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is => "rw", |
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); |
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has post => ( |
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isa => "CodeRef", |
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is => "rw", |
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); |
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has provides_cxt => ( |
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isa => "Bool", |
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is => "rw", |
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); |
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sub is_satisfied { |
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my $self = shift; |
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$self->_wrapped("verify", @_); |
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} |
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sub do { |
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my $self = shift; |
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$self->_wrapped("do", @_); |
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} |
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sub _wrapped { |
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my ( $self, $action_method, @args ) = @_; |
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my ( $c, $poe ) = @args; |
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if (my $pre_hook = $self->pre){ |
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$self->$pre_hook(@args); |
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} |
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if (my $post_hook = $self->post){ |
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my $heap = $poe_kernel->get_active_session->get_heap; |
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push @{ $heap->{post_hooks} }, sub { $self->$post_hook(@args) }; |
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} |
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$self->action->$action_method(@args); |
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} |
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sub step ($;%) { |
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my ( $action, @args ) = @_; |
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if ( @args == 1 ) { |
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unshift @args, "pre"; |
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} elsif ( ref $args[0] and ref $args[0] ) { |
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my ( $pre, $post ) = splice @args, 0, 2; |
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unshift @args, pre => $pre, post => $post; |
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} |
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my %args = @args; |
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unless (blessed $action){ |
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unless (Class::Inspector->loaded($action)) { |
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(my $file = "${action}.pm") =~ s{::}{/}g; |
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require $file; |
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} |
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$action = $action->new; |
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} |
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if ( exists $args{depends} and ref $args{depends} and ref $args{depends} ne 'ARRAY' ) { |
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warn "$args{depends} is not an array"; |
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$args{depends} = [ $args{depends} ]; |
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} |
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my $step = Verby::Step::Closure->new( |
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%args, |
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action => $action |
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); |
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$step; |
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} |
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sub chain_steps { |
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my ( $head, @tail ) = @_; |
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return unless $head; |
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return $head unless @tail; |
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my @rest = chain_steps(@tail); |
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$rest[0]->add_deps($head); |
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if ( wantarray ) { |
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return ( $head, @rest ); |
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} else { |
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return $rest[-1]; |
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} |
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} |
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sub stringify { |
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my $self = shift; |
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ref $self->action || $self->action; |
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} |
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__PACKAGE__ |
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__END__ |
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=pod |
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135
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=head1 NAME |
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Verby::Step::Closure - Quick and dirty (in the fun sense, like playing with |
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mud) step generator. |
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=head1 SYNOPSIS |
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use Verby::Step::Closure qw/step/; |
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my $s = step "Action::Class" => sub { |
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# called before action |
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}, sub { |
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# called after action |
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}; |
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=head1 DESCRIPTION |
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This module eases the creation of step objects, by using closures and |
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accessors. It's purpose is to be able to rapidly create simple steps based on |
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an action class and some clalbacks. |
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Since L<Verby::Action> and L<Verby::Step> are separated, this may lead to |
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unnecessary typing, class creation, or other silly crap. |
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L<Verby::Step::Closure>'s purpose is to make this boundry unnoticable, so that |
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when you don't need it it doesn't get in your way. |
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161
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=head1 EXPORTED FUNCTIONS |
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=over 4 |
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=item B<step $action_class ?$pre ?$post> |
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This function (optionally exportable) is used as a quick and dirty constructor. |
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It will require $action_class with L<UNIVERSAL::require>, and then create a new |
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L<Verby::Step::Closure> with the C<action> field set to an instance. |
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=back |
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=head1 METHODS |
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=over 4 |
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=item B<new $action_class ?$pre ?$post> |
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Creates a new anonymous step. |
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=item B<depends *@steps> |
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Just a plain old accessor. |
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=item B<add_deps *@steps> |
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Append more steps to the dep list. |
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=item B<is_satisfied> |
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Calls the pre hook, C<verify> and then the post hook. |
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=item B<do> |
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Calls the pre hook, C<do>, and lastly the post hook. |
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198
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=item B<stringify> |
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Stringifies to the action's class. |
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=item B<get> |
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204
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=item B<set> |
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206
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Replacements for L<Class::Accessor>'s methods that convert between lists and |
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array references. |
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209
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=item B<can $method> |
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211
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A special case of L<UNIVERSAL/can> that will return false for methods the |
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action can't fulfill. |
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214
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=back |
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216
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=head1 EXAMPLE |
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218
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The test files, as well as the demo scripts make extensive use of |
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L<Verby::Step::Closure>. Look at F<scripts/module_builder.pl> for some |
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documented usage. |
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222
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=head1 BUGS |
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224
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None that we are aware of. Of course, if you find a bug, let us know, and we will be sure to fix it. |
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226
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=head1 CODE COVERAGE |
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228
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We use B<Devel::Cover> to test the code coverage of the tests, please refer to COVERAGE section of the L<Verby> module for more information. |
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230
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=head1 SEE ALSO |
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232
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=head1 AUTHOR |
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Yuval Kogman, E<lt>nothingmuch@woobling.orgE<gt> |
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236
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=head1 COPYRIGHT AND LICENSE |
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238
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Copyright 2005-2008 by Infinity Interactive, Inc. |
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L<http://www.iinteractive.com> |
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242
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This library is free software; you can redistribute it and/or modify |
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it under the same terms as Perl itself. |
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=cut |