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Diffstat (limited to '.checksetup_lib/lib/perl5/CPAN/Meta/Requirements.pm')
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diff --git a/.checksetup_lib/lib/perl5/CPAN/Meta/Requirements.pm b/.checksetup_lib/lib/perl5/CPAN/Meta/Requirements.pm new file mode 100644 index 000000000..b0e83b0d2 --- /dev/null +++ b/.checksetup_lib/lib/perl5/CPAN/Meta/Requirements.pm @@ -0,0 +1,1194 @@ +use 5.006; # keep at v5.6 for CPAN.pm +use strict; +use warnings; +package CPAN::Meta::Requirements; +# ABSTRACT: a set of version requirements for a CPAN dist + +our $VERSION = '2.140'; + +#pod =head1 SYNOPSIS +#pod +#pod use CPAN::Meta::Requirements; +#pod +#pod my $build_requires = CPAN::Meta::Requirements->new; +#pod +#pod $build_requires->add_minimum('Library::Foo' => 1.208); +#pod +#pod $build_requires->add_minimum('Library::Foo' => 2.602); +#pod +#pod $build_requires->add_minimum('Module::Bar' => 'v1.2.3'); +#pod +#pod $METAyml->{build_requires} = $build_requires->as_string_hash; +#pod +#pod =head1 DESCRIPTION +#pod +#pod A CPAN::Meta::Requirements object models a set of version constraints like +#pod those specified in the F<META.yml> or F<META.json> files in CPAN distributions, +#pod and as defined by L<CPAN::Meta::Spec>; +#pod It can be built up by adding more and more constraints, and it will reduce them +#pod to the simplest representation. +#pod +#pod Logically impossible constraints will be identified immediately by thrown +#pod exceptions. +#pod +#pod =cut + +use Carp (); + +# To help ExtUtils::MakeMaker bootstrap CPAN::Meta::Requirements on perls +# before 5.10, we fall back to the EUMM bundled compatibility version module if +# that's the only thing available. This shouldn't ever happen in a normal CPAN +# install of CPAN::Meta::Requirements, as version.pm will be picked up from +# prereqs and be available at runtime. + +BEGIN { + eval "use version ()"; ## no critic + if ( my $err = $@ ) { + eval "use ExtUtils::MakeMaker::version" or die $err; ## no critic + } +} + +# Perl 5.10.0 didn't have "is_qv" in version.pm +*_is_qv = version->can('is_qv') ? sub { $_[0]->is_qv } : sub { exists $_[0]->{qv} }; + +# construct once, reuse many times +my $V0 = version->new(0); + +#pod =method new +#pod +#pod my $req = CPAN::Meta::Requirements->new; +#pod +#pod This returns a new CPAN::Meta::Requirements object. It takes an optional +#pod hash reference argument. Currently, only one key is supported: +#pod +#pod =for :list +#pod * C<bad_version_hook> -- if provided, when a version cannot be parsed into +#pod a version object, this code reference will be called with the invalid +#pod version string as first argument, and the module name as second +#pod argument. It must return a valid version object. +#pod +#pod All other keys are ignored. +#pod +#pod =cut + +my @valid_options = qw( bad_version_hook ); + +sub new { + my ($class, $options) = @_; + $options ||= {}; + Carp::croak "Argument to $class\->new() must be a hash reference" + unless ref $options eq 'HASH'; + my %self = map {; $_ => $options->{$_}} @valid_options; + + return bless \%self => $class; +} + +# from version::vpp +sub _find_magic_vstring { + my $value = shift; + my $tvalue = ''; + require B; + my $sv = B::svref_2object(\$value); + my $magic = ref($sv) eq 'B::PVMG' ? $sv->MAGIC : undef; + while ( $magic ) { + if ( $magic->TYPE eq 'V' ) { + $tvalue = $magic->PTR; + $tvalue =~ s/^v?(.+)$/v$1/; + last; + } + else { + $magic = $magic->MOREMAGIC; + } + } + return $tvalue; +} + +# safe if given an unblessed reference +sub _isa_version { + UNIVERSAL::isa( $_[0], 'UNIVERSAL' ) && $_[0]->isa('version') +} + +sub _version_object { + my ($self, $module, $version) = @_; + + my ($vobj, $err); + + if (not defined $version or (!ref($version) && $version eq '0')) { + return $V0; + } + elsif ( ref($version) eq 'version' || ( ref($version) && _isa_version($version) ) ) { + $vobj = $version; + } + else { + # hack around version::vpp not handling <3 character vstring literals + if ( $INC{'version/vpp.pm'} || $INC{'ExtUtils/MakeMaker/version/vpp.pm'} ) { + my $magic = _find_magic_vstring( $version ); + $version = $magic if length $magic; + } + # pad to 3 characters if before 5.8.1 and appears to be a v-string + if ( $] < 5.008001 && $version !~ /\A[0-9]/ && substr($version,0,1) ne 'v' && length($version) < 3 ) { + $version .= "\0" x (3 - length($version)); + } + eval { + local $SIG{__WARN__} = sub { die "Invalid version: $_[0]" }; + # avoid specific segfault on some older version.pm versions + die "Invalid version: $version" if $version eq 'version'; + $vobj = version->new($version); + }; + if ( my $err = $@ ) { + my $hook = $self->{bad_version_hook}; + $vobj = eval { $hook->($version, $module) } + if ref $hook eq 'CODE'; + unless (eval { $vobj->isa("version") }) { + $err =~ s{ at .* line \d+.*$}{}; + die "Can't convert '$version': $err"; + } + } + } + + # ensure no leading '.' + if ( $vobj =~ m{\A\.} ) { + $vobj = version->new("0$vobj"); + } + + # ensure normal v-string form + if ( _is_qv($vobj) ) { + $vobj = version->new($vobj->normal); + } + + return $vobj; +} + +#pod =method add_minimum +#pod +#pod $req->add_minimum( $module => $version ); +#pod +#pod This adds a new minimum version requirement. If the new requirement is +#pod redundant to the existing specification, this has no effect. +#pod +#pod Minimum requirements are inclusive. C<$version> is required, along with any +#pod greater version number. +#pod +#pod This method returns the requirements object. +#pod +#pod =method add_maximum +#pod +#pod $req->add_maximum( $module => $version ); +#pod +#pod This adds a new maximum version requirement. If the new requirement is +#pod redundant to the existing specification, this has no effect. +#pod +#pod Maximum requirements are inclusive. No version strictly greater than the given +#pod version is allowed. +#pod +#pod This method returns the requirements object. +#pod +#pod =method add_exclusion +#pod +#pod $req->add_exclusion( $module => $version ); +#pod +#pod This adds a new excluded version. For example, you might use these three +#pod method calls: +#pod +#pod $req->add_minimum( $module => '1.00' ); +#pod $req->add_maximum( $module => '1.82' ); +#pod +#pod $req->add_exclusion( $module => '1.75' ); +#pod +#pod Any version between 1.00 and 1.82 inclusive would be acceptable, except for +#pod 1.75. +#pod +#pod This method returns the requirements object. +#pod +#pod =method exact_version +#pod +#pod $req->exact_version( $module => $version ); +#pod +#pod This sets the version required for the given module to I<exactly> the given +#pod version. No other version would be considered acceptable. +#pod +#pod This method returns the requirements object. +#pod +#pod =cut + +BEGIN { + for my $type (qw(maximum exclusion exact_version)) { + my $method = "with_$type"; + my $to_add = $type eq 'exact_version' ? $type : "add_$type"; + + my $code = sub { + my ($self, $name, $version) = @_; + + $version = $self->_version_object( $name, $version ); + + $self->__modify_entry_for($name, $method, $version); + + return $self; + }; + + no strict 'refs'; + *$to_add = $code; + } +} + +# add_minimum is optimized compared to generated subs above because +# it is called frequently and with "0" or equivalent input +sub add_minimum { + my ($self, $name, $version) = @_; + + # stringify $version so that version->new("0.00")->stringify ne "0" + # which preserves the user's choice of "0.00" as the requirement + if (not defined $version or "$version" eq '0') { + return $self if $self->__entry_for($name); + Carp::confess("can't add new requirements to finalized requirements") + if $self->is_finalized; + + $self->{requirements}{ $name } = + CPAN::Meta::Requirements::_Range::Range->with_minimum($V0, $name); + } + else { + $version = $self->_version_object( $name, $version ); + + $self->__modify_entry_for($name, 'with_minimum', $version); + } + return $self; +} + +#pod =method add_requirements +#pod +#pod $req->add_requirements( $another_req_object ); +#pod +#pod This method adds all the requirements in the given CPAN::Meta::Requirements +#pod object to the requirements object on which it was called. If there are any +#pod conflicts, an exception is thrown. +#pod +#pod This method returns the requirements object. +#pod +#pod =cut + +sub add_requirements { + my ($self, $req) = @_; + + for my $module ($req->required_modules) { + my $modifiers = $req->__entry_for($module)->as_modifiers; + for my $modifier (@$modifiers) { + my ($method, @args) = @$modifier; + $self->$method($module => @args); + }; + } + + return $self; +} + +#pod =method accepts_module +#pod +#pod my $bool = $req->accepts_module($module => $version); +#pod +#pod Given an module and version, this method returns true if the version +#pod specification for the module accepts the provided version. In other words, +#pod given: +#pod +#pod Module => '>= 1.00, < 2.00' +#pod +#pod We will accept 1.00 and 1.75 but not 0.50 or 2.00. +#pod +#pod For modules that do not appear in the requirements, this method will return +#pod true. +#pod +#pod =cut + +sub accepts_module { + my ($self, $module, $version) = @_; + + $version = $self->_version_object( $module, $version ); + + return 1 unless my $range = $self->__entry_for($module); + return $range->_accepts($version); +} + +#pod =method clear_requirement +#pod +#pod $req->clear_requirement( $module ); +#pod +#pod This removes the requirement for a given module from the object. +#pod +#pod This method returns the requirements object. +#pod +#pod =cut + +sub clear_requirement { + my ($self, $module) = @_; + + return $self unless $self->__entry_for($module); + + Carp::confess("can't clear requirements on finalized requirements") + if $self->is_finalized; + + delete $self->{requirements}{ $module }; + + return $self; +} + +#pod =method requirements_for_module +#pod +#pod $req->requirements_for_module( $module ); +#pod +#pod This returns a string containing the version requirements for a given module in +#pod the format described in L<CPAN::Meta::Spec> or undef if the given module has no +#pod requirements. This should only be used for informational purposes such as error +#pod messages and should not be interpreted or used for comparison (see +#pod L</accepts_module> instead). +#pod +#pod =cut + +sub requirements_for_module { + my ($self, $module) = @_; + my $entry = $self->__entry_for($module); + return unless $entry; + return $entry->as_string; +} + +#pod =method structured_requirements_for_module +#pod +#pod $req->structured_requirements_for_module( $module ); +#pod +#pod This returns a data structure containing the version requirements for a given +#pod module or undef if the given module has no requirements. This should +#pod not be used for version checks (see L</accepts_module> instead). +#pod +#pod Added in version 2.134. +#pod +#pod =cut + +sub structured_requirements_for_module { + my ($self, $module) = @_; + my $entry = $self->__entry_for($module); + return unless $entry; + return $entry->as_struct; +} + +#pod =method required_modules +#pod +#pod This method returns a list of all the modules for which requirements have been +#pod specified. +#pod +#pod =cut + +sub required_modules { keys %{ $_[0]{requirements} } } + +#pod =method clone +#pod +#pod $req->clone; +#pod +#pod This method returns a clone of the invocant. The clone and the original object +#pod can then be changed independent of one another. +#pod +#pod =cut + +sub clone { + my ($self) = @_; + my $new = (ref $self)->new; + + return $new->add_requirements($self); +} + +sub __entry_for { $_[0]{requirements}{ $_[1] } } + +sub __modify_entry_for { + my ($self, $name, $method, $version) = @_; + + my $fin = $self->is_finalized; + my $old = $self->__entry_for($name); + + Carp::confess("can't add new requirements to finalized requirements") + if $fin and not $old; + + my $new = ($old || 'CPAN::Meta::Requirements::_Range::Range') + ->$method($version, $name); + + Carp::confess("can't modify finalized requirements") + if $fin and $old->as_string ne $new->as_string; + + $self->{requirements}{ $name } = $new; +} + +#pod =method is_simple +#pod +#pod This method returns true if and only if all requirements are inclusive minimums +#pod -- that is, if their string expression is just the version number. +#pod +#pod =cut + +sub is_simple { + my ($self) = @_; + for my $module ($self->required_modules) { + # XXX: This is a complete hack, but also entirely correct. + return if $self->__entry_for($module)->as_string =~ /\s/; + } + + return 1; +} + +#pod =method is_finalized +#pod +#pod This method returns true if the requirements have been finalized by having the +#pod C<finalize> method called on them. +#pod +#pod =cut + +sub is_finalized { $_[0]{finalized} } + +#pod =method finalize +#pod +#pod This method marks the requirements finalized. Subsequent attempts to change +#pod the requirements will be fatal, I<if> they would result in a change. If they +#pod would not alter the requirements, they have no effect. +#pod +#pod If a finalized set of requirements is cloned, the cloned requirements are not +#pod also finalized. +#pod +#pod =cut + +sub finalize { $_[0]{finalized} = 1 } + +#pod =method as_string_hash +#pod +#pod This returns a reference to a hash describing the requirements using the +#pod strings in the L<CPAN::Meta::Spec> specification. +#pod +#pod For example after the following program: +#pod +#pod my $req = CPAN::Meta::Requirements->new; +#pod +#pod $req->add_minimum('CPAN::Meta::Requirements' => 0.102); +#pod +#pod $req->add_minimum('Library::Foo' => 1.208); +#pod +#pod $req->add_maximum('Library::Foo' => 2.602); +#pod +#pod $req->add_minimum('Module::Bar' => 'v1.2.3'); +#pod +#pod $req->add_exclusion('Module::Bar' => 'v1.2.8'); +#pod +#pod $req->exact_version('Xyzzy' => '6.01'); +#pod +#pod my $hashref = $req->as_string_hash; +#pod +#pod C<$hashref> would contain: +#pod +#pod { +#pod 'CPAN::Meta::Requirements' => '0.102', +#pod 'Library::Foo' => '>= 1.208, <= 2.206', +#pod 'Module::Bar' => '>= v1.2.3, != v1.2.8', +#pod 'Xyzzy' => '== 6.01', +#pod } +#pod +#pod =cut + +sub as_string_hash { + my ($self) = @_; + + my %hash = map {; $_ => $self->{requirements}{$_}->as_string } + $self->required_modules; + + return \%hash; +} + +#pod =method add_string_requirement +#pod +#pod $req->add_string_requirement('Library::Foo' => '>= 1.208, <= 2.206'); +#pod $req->add_string_requirement('Library::Foo' => v1.208); +#pod +#pod This method parses the passed in string and adds the appropriate requirement +#pod for the given module. A version can be a Perl "v-string". It understands +#pod version ranges as described in the L<CPAN::Meta::Spec/Version Ranges>. For +#pod example: +#pod +#pod =over 4 +#pod +#pod =item 1.3 +#pod +#pod =item >= 1.3 +#pod +#pod =item <= 1.3 +#pod +#pod =item == 1.3 +#pod +#pod =item != 1.3 +#pod +#pod =item > 1.3 +#pod +#pod =item < 1.3 +#pod +#pod =item >= 1.3, != 1.5, <= 2.0 +#pod +#pod A version number without an operator is equivalent to specifying a minimum +#pod (C<E<gt>=>). Extra whitespace is allowed. +#pod +#pod =back +#pod +#pod =cut + +my %methods_for_op = ( + '==' => [ qw(exact_version) ], + '!=' => [ qw(add_exclusion) ], + '>=' => [ qw(add_minimum) ], + '<=' => [ qw(add_maximum) ], + '>' => [ qw(add_minimum add_exclusion) ], + '<' => [ qw(add_maximum add_exclusion) ], +); + +sub add_string_requirement { + my ($self, $module, $req) = @_; + + unless ( defined $req && length $req ) { + $req = 0; + $self->_blank_carp($module); + } + + my $magic = _find_magic_vstring( $req ); + if (length $magic) { + $self->add_minimum($module => $magic); + return; + } + + my @parts = split qr{\s*,\s*}, $req; + + for my $part (@parts) { + my ($op, $ver) = $part =~ m{\A\s*(==|>=|>|<=|<|!=)\s*(.*)\z}; + + if (! defined $op) { + $self->add_minimum($module => $part); + } else { + Carp::confess("illegal requirement string: $req") + unless my $methods = $methods_for_op{ $op }; + + $self->$_($module => $ver) for @$methods; + } + } +} + +#pod =method from_string_hash +#pod +#pod my $req = CPAN::Meta::Requirements->from_string_hash( \%hash ); +#pod my $req = CPAN::Meta::Requirements->from_string_hash( \%hash, \%opts ); +#pod +#pod This is an alternate constructor for a CPAN::Meta::Requirements +#pod object. It takes a hash of module names and version requirement +#pod strings and returns a new CPAN::Meta::Requirements object. As with +#pod add_string_requirement, a version can be a Perl "v-string". Optionally, +#pod you can supply a hash-reference of options, exactly as with the L</new> +#pod method. +#pod +#pod =cut + +sub _blank_carp { + my ($self, $module) = @_; + Carp::carp("Undefined requirement for $module treated as '0'"); +} + +sub from_string_hash { + my ($class, $hash, $options) = @_; + + my $self = $class->new($options); + + for my $module (keys %$hash) { + my $req = $hash->{$module}; + unless ( defined $req && length $req ) { + $req = 0; + $class->_blank_carp($module); + } + $self->add_string_requirement($module, $req); + } + + return $self; +} + +############################################################## + +{ + package + CPAN::Meta::Requirements::_Range::Exact; + sub _new { bless { version => $_[1] } => $_[0] } + + sub _accepts { return $_[0]{version} == $_[1] } + + sub as_string { return "== $_[0]{version}" } + + sub as_struct { return [ [ '==', "$_[0]{version}" ] ] } + + sub as_modifiers { return [ [ exact_version => $_[0]{version} ] ] } + + sub _reject_requirements { + my ($self, $module, $error) = @_; + Carp::confess("illegal requirements for $module: $error") + } + + sub _clone { + (ref $_[0])->_new( version->new( $_[0]{version} ) ) + } + + sub with_exact_version { + my ($self, $version, $module) = @_; + $module = 'module' unless defined $module; + + return $self->_clone if $self->_accepts($version); + + $self->_reject_requirements( + $module, + "can't be exactly $version when exact requirement is already $self->{version}", + ); + } + + sub with_minimum { + my ($self, $minimum, $module) = @_; + $module = 'module' unless defined $module; + + return $self->_clone if $self->{version} >= $minimum; + $self->_reject_requirements( + $module, + "minimum $minimum exceeds exact specification $self->{version}", + ); + } + + sub with_maximum { + my ($self, $maximum, $module) = @_; + $module = 'module' unless defined $module; + + return $self->_clone if $self->{version} <= $maximum; + $self->_reject_requirements( + $module, + "maximum $maximum below exact specification $self->{version}", + ); + } + + sub with_exclusion { + my ($self, $exclusion, $module) = @_; + $module = 'module' unless defined $module; + + return $self->_clone unless $exclusion == $self->{version}; + $self->_reject_requirements( + $module, + "tried to exclude $exclusion, which is already exactly specified", + ); + } +} + +############################################################## + +{ + package + CPAN::Meta::Requirements::_Range::Range; + + sub _self { ref($_[0]) ? $_[0] : (bless { } => $_[0]) } + + sub _clone { + return (bless { } => $_[0]) unless ref $_[0]; + + my ($s) = @_; + my %guts = ( + (exists $s->{minimum} ? (minimum => version->new($s->{minimum})) : ()), + (exists $s->{maximum} ? (maximum => version->new($s->{maximum})) : ()), + + (exists $s->{exclusions} + ? (exclusions => [ map { version->new($_) } @{ $s->{exclusions} } ]) + : ()), + ); + + bless \%guts => ref($s); + } + + sub as_modifiers { + my ($self) = @_; + my @mods; + push @mods, [ add_minimum => $self->{minimum} ] if exists $self->{minimum}; + push @mods, [ add_maximum => $self->{maximum} ] if exists $self->{maximum}; + push @mods, map {; [ add_exclusion => $_ ] } @{$self->{exclusions} || []}; + return \@mods; + } + + sub as_struct { + my ($self) = @_; + + return 0 if ! keys %$self; + + my @exclusions = @{ $self->{exclusions} || [] }; + + my @parts; + + for my $tuple ( + [ qw( >= > minimum ) ], + [ qw( <= < maximum ) ], + ) { + my ($op, $e_op, $k) = @$tuple; + if (exists $self->{$k}) { + my @new_exclusions = grep { $_ != $self->{ $k } } @exclusions; + if (@new_exclusions == @exclusions) { + push @parts, [ $op, "$self->{ $k }" ]; + } else { + push @parts, [ $e_op, "$self->{ $k }" ]; + @exclusions = @new_exclusions; + } + } + } + + push @parts, map {; [ "!=", "$_" ] } @exclusions; + + return \@parts; + } + + sub as_string { + my ($self) = @_; + + my @parts = @{ $self->as_struct }; + + return $parts[0][1] if @parts == 1 and $parts[0][0] eq '>='; + + return join q{, }, map {; join q{ }, @$_ } @parts; + } + + sub _reject_requirements { + my ($self, $module, $error) = @_; + Carp::confess("illegal requirements for $module: $error") + } + + sub with_exact_version { + my ($self, $version, $module) = @_; + $module = 'module' unless defined $module; + $self = $self->_clone; + + unless ($self->_accepts($version)) { + $self->_reject_requirements( + $module, + "exact specification $version outside of range " . $self->as_string + ); + } + + return CPAN::Meta::Requirements::_Range::Exact->_new($version); + } + + sub _simplify { + my ($self, $module) = @_; + + if (defined $self->{minimum} and defined $self->{maximum}) { + if ($self->{minimum} == $self->{maximum}) { + if (grep { $_ == $self->{minimum} } @{ $self->{exclusions} || [] }) { + $self->_reject_requirements( + $module, + "minimum and maximum are both $self->{minimum}, which is excluded", + ); + } + + return CPAN::Meta::Requirements::_Range::Exact->_new($self->{minimum}) + } + + if ($self->{minimum} > $self->{maximum}) { + $self->_reject_requirements( + $module, + "minimum $self->{minimum} exceeds maximum $self->{maximum}", + ); + } + } + + # eliminate irrelevant exclusions + if ($self->{exclusions}) { + my %seen; + @{ $self->{exclusions} } = grep { + (! defined $self->{minimum} or $_ >= $self->{minimum}) + and + (! defined $self->{maximum} or $_ <= $self->{maximum}) + and + ! $seen{$_}++ + } @{ $self->{exclusions} }; + } + + return $self; + } + + sub with_minimum { + my ($self, $minimum, $module) = @_; + $module = 'module' unless defined $module; + $self = $self->_clone; + + if (defined (my $old_min = $self->{minimum})) { + $self->{minimum} = (sort { $b cmp $a } ($minimum, $old_min))[0]; + } else { + $self->{minimum} = $minimum; + } + + return $self->_simplify($module); + } + + sub with_maximum { + my ($self, $maximum, $module) = @_; + $module = 'module' unless defined $module; + $self = $self->_clone; + + if (defined (my $old_max = $self->{maximum})) { + $self->{maximum} = (sort { $a cmp $b } ($maximum, $old_max))[0]; + } else { + $self->{maximum} = $maximum; + } + + return $self->_simplify($module); + } + + sub with_exclusion { + my ($self, $exclusion, $module) = @_; + $module = 'module' unless defined $module; + $self = $self->_clone; + + push @{ $self->{exclusions} ||= [] }, $exclusion; + + return $self->_simplify($module); + } + + sub _accepts { + my ($self, $version) = @_; + + return if defined $self->{minimum} and $version < $self->{minimum}; + return if defined $self->{maximum} and $version > $self->{maximum}; + return if defined $self->{exclusions} + and grep { $version == $_ } @{ $self->{exclusions} }; + + return 1; + } +} + +1; +# vim: ts=2 sts=2 sw=2 et: + +__END__ + +=pod + +=encoding UTF-8 + +=head1 NAME + +CPAN::Meta::Requirements - a set of version requirements for a CPAN dist + +=head1 VERSION + +version 2.140 + +=head1 SYNOPSIS + + use CPAN::Meta::Requirements; + + my $build_requires = CPAN::Meta::Requirements->new; + + $build_requires->add_minimum('Library::Foo' => 1.208); + + $build_requires->add_minimum('Library::Foo' => 2.602); + + $build_requires->add_minimum('Module::Bar' => 'v1.2.3'); + + $METAyml->{build_requires} = $build_requires->as_string_hash; + +=head1 DESCRIPTION + +A CPAN::Meta::Requirements object models a set of version constraints like +those specified in the F<META.yml> or F<META.json> files in CPAN distributions, +and as defined by L<CPAN::Meta::Spec>; +It can be built up by adding more and more constraints, and it will reduce them +to the simplest representation. + +Logically impossible constraints will be identified immediately by thrown +exceptions. + +=head1 METHODS + +=head2 new + + my $req = CPAN::Meta::Requirements->new; + +This returns a new CPAN::Meta::Requirements object. It takes an optional +hash reference argument. Currently, only one key is supported: + +=over 4 + +=item * + +C<bad_version_hook> -- if provided, when a version cannot be parsed into a version object, this code reference will be called with the invalid version string as first argument, and the module name as second argument. It must return a valid version object. + +=back + +All other keys are ignored. + +=head2 add_minimum + + $req->add_minimum( $module => $version ); + +This adds a new minimum version requirement. If the new requirement is +redundant to the existing specification, this has no effect. + +Minimum requirements are inclusive. C<$version> is required, along with any +greater version number. + +This method returns the requirements object. + +=head2 add_maximum + + $req->add_maximum( $module => $version ); + +This adds a new maximum version requirement. If the new requirement is +redundant to the existing specification, this has no effect. + +Maximum requirements are inclusive. No version strictly greater than the given +version is allowed. + +This method returns the requirements object. + +=head2 add_exclusion + + $req->add_exclusion( $module => $version ); + +This adds a new excluded version. For example, you might use these three +method calls: + + $req->add_minimum( $module => '1.00' ); + $req->add_maximum( $module => '1.82' ); + + $req->add_exclusion( $module => '1.75' ); + +Any version between 1.00 and 1.82 inclusive would be acceptable, except for +1.75. + +This method returns the requirements object. + +=head2 exact_version + + $req->exact_version( $module => $version ); + +This sets the version required for the given module to I<exactly> the given +version. No other version would be considered acceptable. + +This method returns the requirements object. + +=head2 add_requirements + + $req->add_requirements( $another_req_object ); + +This method adds all the requirements in the given CPAN::Meta::Requirements +object to the requirements object on which it was called. If there are any +conflicts, an exception is thrown. + +This method returns the requirements object. + +=head2 accepts_module + + my $bool = $req->accepts_module($module => $version); + +Given an module and version, this method returns true if the version +specification for the module accepts the provided version. In other words, +given: + + Module => '>= 1.00, < 2.00' + +We will accept 1.00 and 1.75 but not 0.50 or 2.00. + +For modules that do not appear in the requirements, this method will return +true. + +=head2 clear_requirement + + $req->clear_requirement( $module ); + +This removes the requirement for a given module from the object. + +This method returns the requirements object. + +=head2 requirements_for_module + + $req->requirements_for_module( $module ); + +This returns a string containing the version requirements for a given module in +the format described in L<CPAN::Meta::Spec> or undef if the given module has no +requirements. This should only be used for informational purposes such as error +messages and should not be interpreted or used for comparison (see +L</accepts_module> instead). + +=head2 structured_requirements_for_module + + $req->structured_requirements_for_module( $module ); + +This returns a data structure containing the version requirements for a given +module or undef if the given module has no requirements. This should +not be used for version checks (see L</accepts_module> instead). + +Added in version 2.134. + +=head2 required_modules + +This method returns a list of all the modules for which requirements have been +specified. + +=head2 clone + + $req->clone; + +This method returns a clone of the invocant. The clone and the original object +can then be changed independent of one another. + +=head2 is_simple + +This method returns true if and only if all requirements are inclusive minimums +-- that is, if their string expression is just the version number. + +=head2 is_finalized + +This method returns true if the requirements have been finalized by having the +C<finalize> method called on them. + +=head2 finalize + +This method marks the requirements finalized. Subsequent attempts to change +the requirements will be fatal, I<if> they would result in a change. If they +would not alter the requirements, they have no effect. + +If a finalized set of requirements is cloned, the cloned requirements are not +also finalized. + +=head2 as_string_hash + +This returns a reference to a hash describing the requirements using the +strings in the L<CPAN::Meta::Spec> specification. + +For example after the following program: + + my $req = CPAN::Meta::Requirements->new; + + $req->add_minimum('CPAN::Meta::Requirements' => 0.102); + + $req->add_minimum('Library::Foo' => 1.208); + + $req->add_maximum('Library::Foo' => 2.602); + + $req->add_minimum('Module::Bar' => 'v1.2.3'); + + $req->add_exclusion('Module::Bar' => 'v1.2.8'); + + $req->exact_version('Xyzzy' => '6.01'); + + my $hashref = $req->as_string_hash; + +C<$hashref> would contain: + + { + 'CPAN::Meta::Requirements' => '0.102', + 'Library::Foo' => '>= 1.208, <= 2.206', + 'Module::Bar' => '>= v1.2.3, != v1.2.8', + 'Xyzzy' => '== 6.01', + } + +=head2 add_string_requirement + + $req->add_string_requirement('Library::Foo' => '>= 1.208, <= 2.206'); + $req->add_string_requirement('Library::Foo' => v1.208); + +This method parses the passed in string and adds the appropriate requirement +for the given module. A version can be a Perl "v-string". It understands +version ranges as described in the L<CPAN::Meta::Spec/Version Ranges>. For +example: + +=over 4 + +=item 1.3 + +=item >= 1.3 + +=item <= 1.3 + +=item == 1.3 + +=item != 1.3 + +=item > 1.3 + +=item < 1.3 + +=item >= 1.3, != 1.5, <= 2.0 + +A version number without an operator is equivalent to specifying a minimum +(C<E<gt>=>). Extra whitespace is allowed. + +=back + +=head2 from_string_hash + + my $req = CPAN::Meta::Requirements->from_string_hash( \%hash ); + my $req = CPAN::Meta::Requirements->from_string_hash( \%hash, \%opts ); + +This is an alternate constructor for a CPAN::Meta::Requirements +object. It takes a hash of module names and version requirement +strings and returns a new CPAN::Meta::Requirements object. As with +add_string_requirement, a version can be a Perl "v-string". Optionally, +you can supply a hash-reference of options, exactly as with the L</new> +method. + +=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<https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements/issues>. +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<https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements> + + git clone https://github.com/Perl-Toolchain-Gang/CPAN-Meta-Requirements.git + +=head1 AUTHORS + +=over 4 + +=item * + +David Golden <dagolden@cpan.org> + +=item * + +Ricardo Signes <rjbs@cpan.org> + +=back + +=head1 CONTRIBUTORS + +=for stopwords Ed J Karen Etheridge Leon Timmermans robario + +=over 4 + +=item * + +Ed J <mohawk2@users.noreply.github.com> + +=item * + +Karen Etheridge <ether@cpan.org> + +=item * + +Leon Timmermans <fawaka@gmail.com> + +=item * + +robario <webmaster@robario.com> + +=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 |