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CPAN::Meta::RequirementPerleProgrammers ReferenCPAN::Meta::Requirements(3perl)

       CPAN::Meta::Requirements - a set of version requirements for a CPAN

       version 2.122

	 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;

       A CPAN::Meta::Requirements object models a set of version constraints
       like those specified in the META.yml or META.json files in CPAN
       distributions.  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.

	 my $req = CPAN::Meta::Requirements->new;

       This returns a new CPAN::Meta::Requirements object.  It takes an
       optional hash reference argument.  The following keys are supported:

       ·   <bad_version_hook> -- if provided, when a version cannot be parsed

	   a version object, this code reference will be called with the
	   invalid version string as an argument.  It must return a valid
	   version object.

       All other keys are ignored.

	 $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.  $version is required, along with
       any greater version number.

       This method returns the requirements object.

	 $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.

	 $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.

	 $req->exact_version( $module => $version );

       This sets the version required for the given module to exactly the
       given version.  No other version would be considered acceptable.

       This method returns the requirements object.

	 $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.

	 my $bool = $req->accepts_modules($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.

	 $req->clear_requirement( $module );

       This removes the requirement for a given module from the object.

       This method returns the requirements object.

	 $req->requirements_for_module( $module );

       This returns a string containing the version requirements for a given
       module in the format described in 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 "accepts_module" instead.)

       This method returns a list of all the modules for which requirements
       have been specified.


       This method returns a clone of the invocant.  The clone and the
       original object can then be changed independent of one another.

       This method returns true if and only if all requirements are inclusive
       minimums -- that is, if their string expression is just the version

       This method returns true if the requirements have been finalized by
       having the "finalize" method called on them.

       This method marks the requirements finalized.  Subsequent attempts to
       change the requirements will be fatal, 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.

       This returns a reference to a hash describing the requirements using
       the strings in the META.yml 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;

       $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',

	 $req->add_string_requirement('Library::Foo' => '>= 1.208, <= 2.206');

       This method parses the passed in string and adds the appropriate
       requirement for the given module.  It understands version ranges as
       described in the "Version Ranges" in CPAN::Meta::Spec. For example:

       >= 1.3
       <= 1.3
       == 1.3
       != 1.3
       > 1.3
       < 1.3
       >= 1.3, != 1.5, <= 2.0
	   A version number without an operator is equivalent to specifying a
	   minimum (">=").  Extra whitespace is allowed.

	 my $req = CPAN::Meta::Requirements->from_string_hash( \%hash );

       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.

   Bugs / Feature Requests
       Please report any bugs or feature requests through the issue tracker at
       You will be notified automatically of any progress on your issue.

   Source Code
       This is open source software.  The code repository is available for
       public review and contribution under the terms of the license.


	 git clone

       ·   David Golden <>

       ·   Ricardo Signes <>

       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.

perl v5.18.2			  2014-01-06   CPAN::Meta::Requirements(3perl)

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