Current File : //usr/share/perl5/vendor_perl/CPAN/Meta/Prereqs.pm
use 5.006;
use strict;
use warnings;
package CPAN::Meta::Prereqs;
our $VERSION = '2.120921'; # VERSION
use Carp qw(confess);
use Scalar::Util qw(blessed);
use CPAN::Meta::Requirements 2.121;
sub __legal_phases { qw(configure build test runtime develop) }
sub __legal_types { qw(requires recommends suggests conflicts) }
# expect a prereq spec from META.json -- rjbs, 2010-04-11
sub new {
my ($class, $prereq_spec) = @_;
$prereq_spec ||= {};
my %is_legal_phase = map {; $_ => 1 } $class->__legal_phases;
my %is_legal_type = map {; $_ => 1 } $class->__legal_types;
my %guts;
PHASE: for my $phase (keys %$prereq_spec) {
next PHASE unless $phase =~ /\Ax_/i or $is_legal_phase{$phase};
my $phase_spec = $prereq_spec->{ $phase };
next PHASE unless keys %$phase_spec;
TYPE: for my $type (keys %$phase_spec) {
next TYPE unless $type =~ /\Ax_/i or $is_legal_type{$type};
my $spec = $phase_spec->{ $type };
next TYPE unless keys %$spec;
$guts{prereqs}{$phase}{$type} = CPAN::Meta::Requirements->from_string_hash(
$spec
);
}
}
return bless \%guts => $class;
}
sub requirements_for {
my ($self, $phase, $type) = @_;
confess "requirements_for called without phase" unless defined $phase;
confess "requirements_for called without type" unless defined $type;
unless ($phase =~ /\Ax_/i or grep { $phase eq $_ } $self->__legal_phases) {
confess "requested requirements for unknown phase: $phase";
}
unless ($type =~ /\Ax_/i or grep { $type eq $_ } $self->__legal_types) {
confess "requested requirements for unknown type: $type";
}
my $req = ($self->{prereqs}{$phase}{$type} ||= CPAN::Meta::Requirements->new);
$req->finalize if $self->is_finalized;
return $req;
}
sub with_merged_prereqs {
my ($self, $other) = @_;
my @other = blessed($other) ? $other : @$other;
my @prereq_objs = ($self, @other);
my %new_arg;
for my $phase ($self->__legal_phases) {
for my $type ($self->__legal_types) {
my $req = CPAN::Meta::Requirements->new;
for my $prereq (@prereq_objs) {
my $this_req = $prereq->requirements_for($phase, $type);
next unless $this_req->required_modules;
$req->add_requirements($this_req);
}
next unless $req->required_modules;
$new_arg{ $phase }{ $type } = $req->as_string_hash;
}
}
return (ref $self)->new(\%new_arg);
}
sub as_string_hash {
my ($self) = @_;
my %hash;
for my $phase ($self->__legal_phases) {
for my $type ($self->__legal_types) {
my $req = $self->requirements_for($phase, $type);
next unless $req->required_modules;
$hash{ $phase }{ $type } = $req->as_string_hash;
}
}
return \%hash;
}
sub is_finalized { $_[0]{finalized} }
sub finalize {
my ($self) = @_;
$self->{finalized} = 1;
for my $phase (keys %{ $self->{prereqs} }) {
$_->finalize for values %{ $self->{prereqs}{$phase} };
}
}
sub clone {
my ($self) = @_;
my $clone = (ref $self)->new( $self->as_string_hash );
}
1;
# ABSTRACT: a set of distribution prerequisites by phase and type
=pod
=head1 NAME
CPAN::Meta::Prereqs - a set of distribution prerequisites by phase and type
=head1 VERSION
version 2.120921
=head1 DESCRIPTION
A CPAN::Meta::Prereqs object represents the prerequisites for a CPAN
distribution or one of its optional features. Each set of prereqs is
organized by phase and type, as described in L<CPAN::Meta::Prereqs>.
=head1 METHODS
=head2 new
my $prereq = CPAN::Meta::Prereqs->new( \%prereq_spec );
This method returns a new set of Prereqs. The input should look like the
contents of the C<prereqs> field described in L<CPAN::Meta::Spec>, meaning
something more or less like this:
my $prereq = CPAN::Meta::Prereqs->new({
runtime => {
requires => {
'Some::Module' => '1.234',
...,
},
...,
},
...,
});
You can also construct an empty set of prereqs with:
my $prereqs = CPAN::Meta::Prereqs->new;
This empty set of prereqs is useful for accumulating new prereqs before finally
dumping the whole set into a structure or string.
=head2 requirements_for
my $requirements = $prereqs->requirements_for( $phase, $type );
This method returns a L<CPAN::Meta::Requirements> object for the given
phase/type combination. If no prerequisites are registered for that
combination, a new CPAN::Meta::Requirements object will be returned, and it may
be added to as needed.
If C<$phase> or C<$type> are undefined or otherwise invalid, an exception will
be raised.
=head2 with_merged_prereqs
my $new_prereqs = $prereqs->with_merged_prereqs( $other_prereqs );
my $new_prereqs = $prereqs->with_merged_prereqs( \@other_prereqs );
This method returns a new CPAN::Meta::Prereqs objects in which all the
other prerequisites given are merged into the current set. This is primarily
provided for combining a distribution's core prereqs with the prereqs of one of
its optional features.
The new prereqs object has no ties to the originals, and altering it further
will not alter them.
=head2 as_string_hash
This method returns a hashref containing structures suitable for dumping into a
distmeta data structure. It is made up of hashes and strings, only; there will
be no Prereqs, CPAN::Meta::Requirements, or C<version> objects inside it.
=head2 is_finalized
This method returns true if the set of prereqs has been marked "finalized," and
cannot be altered.
=head2 finalize
Calling C<finalize> on a Prereqs object will close it for further modification.
Attempting to make any changes that would actually alter the prereqs will
result in an exception being thrown.
=head2 clone
my $cloned_prereqs = $prereqs->clone;
This method returns a Prereqs object that is identical to the original object,
but can be altered without affecting the original object. Finalization does
not survive cloning, meaning that you may clone a finalized set of prereqs and
then modify the clone.
=head1 BUGS
Please report any bugs or feature using the CPAN Request Tracker.
Bugs can be submitted through the web interface at
L<http://rt.cpan.org/Dist/Display.html?Queue=CPAN-Meta>
When submitting a bug or request, please include a test-file or a patch to an
existing test-file that illustrates the bug or desired feature.
=head1 AUTHORS
=over 4
=item *
David Golden <dagolden@cpan.org>
=item *
Ricardo Signes <rjbs@cpan.org>
=back
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by David Golden and 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
__END__
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