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use strict; use warnings; package CPAN::Meta::Merge; # VERSION $CPAN::Meta::Merge::VERSION = '2.143240'; use Carp qw/croak/; use Scalar::Util qw/blessed/; use CPAN::Meta::Converter; sub _identical { my ($left, $right, $path) = @_; croak sprintf "Can't merge attribute %s: '%s' does not equal '%s'", join('.', @{$path}), $left, $right unless $left eq $right; return $left; } sub _merge { my ($current, $next, $mergers, $path) = @_; for my $key (keys %{$next}) { if (not exists $current->{$key}) { $current->{$key} = $next->{$key}; } elsif (my $merger = $mergers->{$key}) { $current->{$key} = $merger->($current->{$key}, $next->{$key}, [ @{$path}, $key ]); } elsif ($merger = $mergers->{':default'}) { $current->{$key} = $merger->($current->{$key}, $next->{$key}, [ @{$path}, $key ]); } else { croak sprintf "Can't merge unknown attribute '%s'", join '.', @{$path}, $key; } } return $current; } sub _uniq { my %seen = (); return grep { not $seen{$_}++ } @_; } sub _set_addition { my ($left, $right) = @_; return [ +_uniq(@{$left}, @{$right}) ]; } sub _uniq_map { my ($left, $right, $path) = @_; for my $key (keys %{$right}) { if (not exists $left->{$key}) { $left->{$key} = $right->{$key}; } else { croak 'Duplication of element ' . join '.', @{$path}, $key; } } return $left; } sub _improvize { my ($left, $right, $path) = @_; my ($name) = reverse @{$path}; if ($name =~ /^x_/) { if (ref($left) eq 'ARRAY') { return _set_addition($left, $right, $path); } elsif (ref($left) eq 'HASH') { return _uniq_map($left, $right, $path); } else { return _identical($left, $right, $path); } } croak sprintf "Can't merge '%s'", join '.', @{$path}; } sub _optional_features { my ($left, $right, $path) = @_; for my $key (keys %{$right}) { if (not exists $left->{$key}) { $left->{$key} = $right->{$key}; } else { for my $subkey (keys %{ $right->{$key} }) { next if $subkey eq 'prereqs'; if (not exists $left->{$key}{$subkey}) { $left->{$key}{$subkey} = $right->{$key}{$subkey}; } else { Carp::croak "Cannot merge two optional_features named '$key' with different '$subkey' values" if do { no warnings 'uninitialized'; $left->{$key}{$subkey} ne $right->{$key}{$subkey} }; } } require CPAN::Meta::Prereqs; $left->{$key}{prereqs} = CPAN::Meta::Prereqs->new($left->{$key}{prereqs}) ->with_merged_prereqs(CPAN::Meta::Prereqs->new($right->{$key}{prereqs})) ->as_string_hash; } } return $left; } my %default = ( abstract => \&_identical, author => \&_set_addition, dynamic_config => sub { my ($left, $right) = @_; return $left \|\| $right; }, generated_by => sub { my ($left, $right) = @_; return join ', ', _uniq(split(/, /, $left), split(/, /, $right)); }, license => \&_set_addition, 'meta-spec' => { version => \&_identical, url => \&_identical }, name => \&_identical, release_status => \&_identical, version => \&_identical, description => \&_identical, keywords => \&_set_addition, no_index => { map { ($_ => \&_set_addition) } qw/file directory package namespace/ }, optional_features => \&_optional_features, prereqs => sub { require CPAN::Meta::Prereqs; my ($left, $right) = map { CPAN::Meta::Prereqs->new($_) } @_[0,1]; return $left->with_merged_prereqs($right)->as_string_hash; }, provides => \&_uniq_map, resources => { license => \&_set_addition, homepage => \&_identical, bugtracker => \&_uniq_map, repository => \&_uniq_map, ':default' => \&_improvize, }, ':default' => \&_improvize, ); sub new { my ($class, %arguments) = @_; croak 'default version required' if not exists $arguments{default_version}; my %mapping = %default; my %extra = %{ $arguments{extra_mappings} \|\| {} }; for my $key (keys %extra) { if (ref($mapping{$key}) eq 'HASH') { $mapping{$key} = { %{ $mapping{$key} }, %{ $extra{$key} } }; } else { $mapping{$key} = $extra{$key}; } } return bless { default_version => $arguments{default_version}, mapping => _coerce_mapping(\%mapping, []), }, $class; } my %coderef_for = ( set_addition => \&_set_addition, uniq_map => \&_uniq_map, identical => \&_identical, improvize => \&_improvize, ); sub _coerce_mapping { my ($orig, $map_path) = @_; my %ret; for my $key (keys %{$orig}) { my $value = $orig->{$key}; if (ref($orig->{$key}) eq 'CODE') { $ret{$key} = $value; } elsif (ref($value) eq 'HASH') { my $mapping = _coerce_mapping($value, [ @{$map_path}, $key ]); $ret{$key} = sub { my ($left, $right, $path) = @_; return _merge($left, $right, $mapping, [ @{$path} ]); }; } elsif ($coderef_for{$value}) { $ret{$key} = $coderef_for{$value}; } else { croak "Don't know what to do with " . join '.', @{$map_path}, $key; } } return \%ret; } sub merge { my ($self, @items) = @_; my $current = {}; for my $next (@items) { if ( blessed($next) && $next->isa('CPAN::Meta') ) { $next = $next->as_struct; } elsif ( ref($next) eq 'HASH' ) { my $cmc = CPAN::Meta::Converter->new( $next, default_version => $self->{default_version} ); $next = $cmc->upgrade_fragment; } else { croak "Don't know how to merge '$next'"; } $current = _merge($current, $next, $self->{mapping}, []); } return $current; } 1; # ABSTRACT: Merging CPAN Meta fragments __END__ =pod =encoding UTF-8 =head1 NAME CPAN::Meta::Merge - Merging CPAN Meta fragments =head1 VERSION version 2.143240 =head1 SYNOPSIS my $merger = CPAN::Meta::Merge->new(default_version => "2"); my $meta = $merger->merge($base, @additional); =head1 DESCRIPTION =head1 METHODS =head2 new This creates a CPAN::Meta::Merge object. It takes one mandatory named argument, C<version>, declaring the version of the meta-spec that must be used for the merge. It can optionally take an C<extra_mappings> argument that allows one to add additional merging functions for specific elements. =head2 merge(@fragments) Merge all C<@fragments> together. It will accept both CPAN::Meta objects and (possibly incomplete) hashrefs of metadata. =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

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