use 5.006; use strict; use warnings; package CPAN::Meta; our $VERSION = '2.120921'; # VERSION use Carp qw(carp croak); use CPAN::Meta::Feature; use CPAN::Meta::Prereqs; use CPAN::Meta::Converter; use CPAN::Meta::Validator; use Parse::CPAN::Meta 1.4403 (); BEGIN { *_dclone = \&CPAN::Meta::Converter::_dclone } BEGIN { my @STRING_READERS = qw( abstract description dynamic_config generated_by name release_status version ); no strict 'refs'; for my $attr (@STRING_READERS) { *$attr = sub { $_[0]{ $attr } }; } } BEGIN { my @LIST_READERS = qw( author keywords license ); no strict 'refs'; for my $attr (@LIST_READERS) { *$attr = sub { my $value = $_[0]{ $attr }; croak "$attr must be called in list context" unless wantarray; return @{ _dclone($value) } if ref $value; return $value; }; } } sub authors { $_[0]->author } sub licenses { $_[0]->license } BEGIN { my @MAP_READERS = qw( meta-spec resources provides no_index prereqs optional_features ); no strict 'refs'; for my $attr (@MAP_READERS) { (my $subname = $attr) =~ s/-/_/; *$subname = sub { my $value = $_[0]{ $attr }; return _dclone($value) if $value; return {}; }; } } sub custom_keys { return grep { /^x_/i } keys %{$_[0]}; } sub custom { my ($self, $attr) = @_; my $value = $self->{$attr}; return _dclone($value) if ref $value; return $value; } sub _new { my ($class, $struct, $options) = @_; my $self; if ( $options->{lazy_validation} ) { # try to convert to a valid structure; if succeeds, then return it my $cmc = CPAN::Meta::Converter->new( $struct ); $self = $cmc->convert( version => 2 ); # valid or dies return bless $self, $class; } else { # validate original struct my $cmv = CPAN::Meta::Validator->new( $struct ); unless ( $cmv->is_valid) { die "Invalid metadata structure. Errors: " . join(", ", $cmv->errors) . "\n"; } } # up-convert older spec versions my $version = $struct->{'meta-spec'}{version} || '1.0'; if ( $version == 2 ) { $self = $struct; } else { my $cmc = CPAN::Meta::Converter->new( $struct ); $self = $cmc->convert( version => 2 ); } return bless $self, $class; } sub new { my ($class, $struct, $options) = @_; my $self = eval { $class->_new($struct, $options) }; croak($@) if $@; return $self; } sub create { my ($class, $struct, $options) = @_; my $version = __PACKAGE__->VERSION || 2; $struct->{generated_by} ||= __PACKAGE__ . " version $version" ; $struct->{'meta-spec'}{version} ||= int($version); my $self = eval { $class->_new($struct, $options) }; croak ($@) if $@; return $self; } sub load_file { my ($class, $file, $options) = @_; $options->{lazy_validation} = 1 unless exists $options->{lazy_validation}; croak "load_file() requires a valid, readable filename" unless -r $file; my $self; eval { my $struct = Parse::CPAN::Meta->load_file( $file ); $self = $class->_new($struct, $options); }; croak($@) if $@; return $self; } sub load_yaml_string { my ($class, $yaml, $options) = @_; $options->{lazy_validation} = 1 unless exists $options->{lazy_validation}; my $self; eval { my ($struct) = Parse::CPAN::Meta->load_yaml_string( $yaml ); $self = $class->_new($struct, $options); }; croak($@) if $@; return $self; } sub load_json_string { my ($class, $json, $options) = @_; $options->{lazy_validation} = 1 unless exists $options->{lazy_validation}; my $self; eval { my $struct = Parse::CPAN::Meta->load_json_string( $json ); $self = $class->_new($struct, $options); }; croak($@) if $@; return $self; } sub save { my ($self, $file, $options) = @_; my $version = $options->{version} || '2'; my $layer = $] ge '5.008001' ? ':utf8' : ''; if ( $version ge '2' ) { carp "'$file' should end in '.json'" unless $file =~ m{\.json$}; } else { carp "'$file' should end in '.yml'" unless $file =~ m{\.yml$}; } my $data = $self->as_string( $options ); open my $fh, ">$layer", $file or die "Error opening '$file' for writing: $!\n"; print {$fh} $data; close $fh or die "Error closing '$file': $!\n"; return 1; } sub meta_spec_version { my ($self) = @_; return $self->meta_spec->{version}; } sub effective_prereqs { my ($self, $features) = @_; $features ||= []; my $prereq = CPAN::Meta::Prereqs->new($self->prereqs); return $prereq unless @$features; my @other = map {; $self->feature($_)->prereqs } @$features; return $prereq->with_merged_prereqs(\@other); } sub should_index_file { my ($self, $filename) = @_; for my $no_index_file (@{ $self->no_index->{file} || [] }) { return if $filename eq $no_index_file; } for my $no_index_dir (@{ $self->no_index->{directory} }) { $no_index_dir =~ s{$}{/} unless $no_index_dir =~ m{/\z}; return if index($filename, $no_index_dir) == 0; } return 1; } sub should_index_package { my ($self, $package) = @_; for my $no_index_pkg (@{ $self->no_index->{package} || [] }) { return if $package eq $no_index_pkg; } for my $no_index_ns (@{ $self->no_index->{namespace} }) { return if index($package, "${no_index_ns}::") == 0; } return 1; } sub features { my ($self) = @_; my $opt_f = $self->optional_features; my @features = map {; CPAN::Meta::Feature->new($_ => $opt_f->{ $_ }) } keys %$opt_f; return @features; } sub feature { my ($self, $ident) = @_; croak "no feature named $ident" unless my $f = $self->optional_features->{ $ident }; return CPAN::Meta::Feature->new($ident, $f); } sub as_struct { my ($self, $options) = @_; my $struct = _dclone($self); if ( $options->{version} ) { my $cmc = CPAN::Meta::Converter->new( $struct ); $struct = $cmc->convert( version => $options->{version} ); } return $struct; } sub as_string { my ($self, $options) = @_; my $version = $options->{version} || '2'; my $struct; if ( $self->meta_spec_version ne $version ) { my $cmc = CPAN::Meta::Converter->new( $self->as_struct ); $struct = $cmc->convert( version => $version ); } else { $struct = $self->as_struct; } my ($data, $backend); if ( $version ge '2' ) { $backend = Parse::CPAN::Meta->json_backend(); $data = $backend->new->pretty->canonical->encode($struct); } else { $backend = Parse::CPAN::Meta->yaml_backend(); $data = eval { no strict 'refs'; &{"$backend\::Dump"}($struct) }; if ( $@ ) { croak $backend->can('errstr') ? $backend->errstr : $@ } } return $data; } # Used by JSON::PP, etc. for "convert_blessed" sub TO_JSON { return { %{ $_[0] } }; } 1; # ABSTRACT: the distribution metadata for a CPAN dist =pod =head1 NAME CPAN::Meta - the distribution metadata for a CPAN dist =head1 VERSION version 2.120921 =head1 SYNOPSIS my $meta = CPAN::Meta->load_file('META.json'); printf "testing requirements for %s version %s\n", $meta->name, $meta->version; my $prereqs = $meta->requirements_for('configure'); for my $module ($prereqs->required_modules) { my $version = get_local_version($module); die "missing required module $module" unless defined $version; die "version for $module not in range" unless $prereqs->accepts_module($module, $version); } =head1 DESCRIPTION Software distributions released to the CPAN include a F<META.json> or, for older distributions, F<META.yml>, which describes the distribution, its contents, and the requirements for building and installing the distribution. The data structure stored in the F<META.json> file is described in L<CPAN::Meta::Spec>. CPAN::Meta provides a simple class to represent this distribution metadata (or I<distmeta>), along with some helpful methods for interrogating that data. The documentation below is only for the methods of the CPAN::Meta object. For information on the meaning of individual fields, consult the spec. =head1 METHODS =head2 new my $meta = CPAN::Meta->new($distmeta_struct, \%options); Returns a valid CPAN::Meta object or dies if the supplied metadata hash reference fails to validate. Older-format metadata will be up-converted to version 2 if they validate against the original stated specification. It takes an optional hashref of options. Valid options include: =over =item * lazy_validation -- if true, new will attempt to convert the given metadata to version 2 before attempting to validate it. This means than any fixable errors will be handled by CPAN::Meta::Converter before validation. (Note that this might result in invalid optional data being silently dropped.) The default is false. =back =head2 create my $meta = CPAN::Meta->create($distmeta_struct, \%options); This is same as C<new()>, except that C<generated_by> and C<meta-spec> fields will be generated if not provided. This means the metadata structure is assumed to otherwise follow the latest L<CPAN::Meta::Spec>. =head2 load_file my $meta = CPAN::Meta->load_file($distmeta_file, \%options); Given a pathname to a file containing metadata, this deserializes the file according to its file suffix and constructs a new C<CPAN::Meta> object, just like C<new()>. It will die if the deserialized version fails to validate against its stated specification version. It takes the same options as C<new()> but C<lazy_validation> defaults to true. =head2 load_yaml_string my $meta = CPAN::Meta->load_yaml_string($yaml, \%options); This method returns a new CPAN::Meta object using the first document in the given YAML string. In other respects it is identical to C<load_file()>. =head2 load_json_string my $meta = CPAN::Meta->load_json_string($json, \%options); This method returns a new CPAN::Meta object using the structure represented by the given JSON string. In other respects it is identical to C<load_file()>. =head2 save $meta->save($distmeta_file, \%options); Serializes the object as JSON and writes it to the given file. The only valid option is C<version>, which defaults to '2'. On Perl 5.8.1 or later, the file is saved with UTF-8 encoding. For C<version> 2 (or higher), the filename should end in '.json'. L<JSON::PP> is the default JSON backend. Using another JSON backend requires L<JSON> 2.5 or later and you must set the C<$ENV{PERL_JSON_BACKEND}> to a supported alternate backend like L<JSON::XS>. For C<version> less than 2, the filename should end in '.yml'. L<CPAN::Meta::Converter> is used to generate an older metadata structure, which is serialized to YAML. CPAN::Meta::YAML is the default YAML backend. You may set the C<$ENV{PERL_YAML_BACKEND}> to a supported alternative backend, though this is not recommended due to subtle incompatibilities between YAML parsers on CPAN. =head2 meta_spec_version This method returns the version part of the C<meta_spec> entry in the distmeta structure. It is equivalent to: $meta->meta_spec->{version}; =head2 effective_prereqs my $prereqs = $meta->effective_prereqs; my $prereqs = $meta->effective_prereqs( \@feature_identifiers ); This method returns a L<CPAN::Meta::Prereqs> object describing all the prereqs for the distribution. If an arrayref of feature identifiers is given, the prereqs for the identified features are merged together with the distribution's core prereqs before the CPAN::Meta::Prereqs object is returned. =head2 should_index_file ... if $meta->should_index_file( $filename ); This method returns true if the given file should be indexed. It decides this by checking the C<file> and C<directory> keys in the C<no_index> property of the distmeta structure. C<$filename> should be given in unix format. =head2 should_index_package ... if $meta->should_index_package( $package ); This method returns true if the given package should be indexed. It decides this by checking the C<package> and C<namespace> keys in the C<no_index> property of the distmeta structure. =head2 features my @feature_objects = $meta->features; This method returns a list of L<CPAN::Meta::Feature> objects, one for each optional feature described by the distribution's metadata. =head2 feature my $feature_object = $meta->feature( $identifier ); This method returns a L<CPAN::Meta::Feature> object for the optional feature with the given identifier. If no feature with that identifier exists, an exception will be raised. =head2 as_struct my $copy = $meta->as_struct( \%options ); This method returns a deep copy of the object's metadata as an unblessed has reference. It takes an optional hashref of options. If the hashref contains a C<version> argument, the copied metadata will be converted to the version of the specification and returned. For example: my $old_spec = $meta->as_struct( {version => "1.4"} ); =head2 as_string my $string = $meta->as_string( \%options ); This method returns a serialized copy of the object's metadata as a character string. (The strings are B<not> UTF-8 encoded.) It takes an optional hashref of options. If the hashref contains a C<version> argument, the copied metadata will be converted to the version of the specification and returned. For example: my $string = $meta->as_struct( {version => "1.4"} ); For C<version> greater than or equal to 2, the string will be serialized as JSON. For C<version> less than 2, the string will be serialized as YAML. In both cases, the same rules are followed as in the C<save()> method for choosing a serialization backend. =head1 STRING DATA The following methods return a single value, which is the value for the corresponding entry in the distmeta structure. Values should be either undef or strings. =over 4 =item * abstract =item * description =item * dynamic_config =item * generated_by =item * name =item * release_status =item * version =back =head1 LIST DATA These methods return lists of string values, which might be represented in the distmeta structure as arrayrefs or scalars: =over 4 =item * authors =item * keywords =item * licenses =back The C<authors> and C<licenses> methods may also be called as C<author> and C<license>, respectively, to match the field name in the distmeta structure. =head1 MAP DATA These readers return hashrefs of arbitrary unblessed data structures, each described more fully in the specification: =over 4 =item * meta_spec =item * resources =item * provides =item * no_index =item * prereqs =item * optional_features =back =head1 CUSTOM DATA A list of custom keys are available from the C<custom_keys> method and particular keys may be retrieved with the C<custom> method. say $meta->custom($_) for $meta->custom_keys; If a custom key refers to a data structure, a deep clone is returned. =for Pod::Coverage TO_JSON abstract author authors custom custom_keys description dynamic_config generated_by keywords license licenses meta_spec name no_index optional_features prereqs provides release_status resources version =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 SEE ALSO =over 4 =item * L<CPAN::Meta::Converter> =item * L<CPAN::Meta::Validator> =back =for :stopwords cpan testmatrix url annocpan anno bugtracker rt cpants kwalitee diff irc mailto metadata placeholders metacpan =head1 SUPPORT =head2 Bugs / Feature Requests Please report any bugs or feature requests through the issue tracker at L<http://rt.cpan.org/Public/Dist/Display.html?Name=CPAN-Meta>. You will be notified automatically of any progress on your issue. =head2 Source Code This is open source software. The code repository is available for public review and contribution under the terms of the license. L<http://github.com/dagolden/cpan-meta> git clone git://github.com/dagolden/cpan-meta.git =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__