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NAME
CPAN::Meta::Requirements - a set of version requirements for a CPAN dist
VERSION
version 2.122
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;
DESCRIPTION
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.
METHODS
new
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
into
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.
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. $version is required, along with any
greater version number.
This method returns the requirements object.
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.
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.
exact_version
$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.
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.
accepts_module
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.
clear_requirement
$req->clear_requirement( $module );
This removes the requirement for a given module from the object.
This method returns the requirements object.
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 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.)
required_modules
This method returns a list of all the modules for which requirements
have been specified.
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.
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.
is_finalized
This method returns true if the requirements have been finalized by
having the "finalize" method called on them.
finalize
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.
as_string_hash
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',
}
add_string_requirement
$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
>= 1.3, != 1.5, <= 2.0
A version number without an operator is equivalent to specifying a
minimum (">="). Extra whitespace is allowed.
from_string_hash
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.
SUPPORT
Bugs / Feature Requests
Please report any bugs or feature requests through the issue tracker at
<http://rt.cpan.org/Public/Dist/Display.html?Name=CPAN-Meta-Requirements
>. 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.
<https://github.com/dagolden/cpan-meta-requirements>
git clone https://github.com/dagolden/cpan-meta-requirements.git
AUTHORS
* David Golden <dagolden@cpan.org>
* Ricardo Signes <rjbs@cpan.org>
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.
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