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package URI::VersionRange::Constraint;
use feature ':5.10';
use strict;
use utf8;
use warnings;
use Carp ();
use Exporter qw(import);
use overload '""' => 'to_string', fallback => 1;
use URI::VersionRange::Version;
our $VERSION = '2.23';
our %COMPARATOR = (
'=' => 'equal',
'<' => 'less than',
'<=' => 'less than or equal',
'>' => 'greater than',
'>=' => 'greater than or equal',
);
sub new {
my ($class, %params) = @_;
my $comparator = delete $params{comparator} // '=';
my $version = delete $params{version};
my $self = {comparator => $comparator, version => $version};
return bless $self, $class;
}
sub version { shift->{version} }
sub comparator { shift->{comparator} }
sub from_string {
my ($class, $string) = @_;
Carp::croak 'Empty version' unless $string;
# - For each <version-constraint>:
# - Determine if the <version-constraint> starts with one of the two comparators:
# - If it starts with ">=", then the comparator is ">=".
# - If it starts with "<=", then the comparator is "<=".
# - If it starts with "!=", then the comparator is "!=".
# - If it starts with "<", then the comparator is "<".
# - If it starts with ">", then the comparator is ">".
# - Remove the comparator from <version-constraint> string start. The remaining string is the version.
# - Otherwise the version is the full <version-constraint> string (which implies an equality comparator of "=")
# - Tools should validate and report an error if the version is empty.
# - If the version contains a percent "%" character, apply URL quoting rules to unquote this string.
if ($string =~ /^(>=|<=|!=|<|>)(.*)/) {
my ($comparator, $version) = ($1, $2);
return $class->new(comparator => $comparator, version => $version);
}
return $class->new(comparator => '*') if ($string eq '*');
return $class->new(comparator => '=', version => $string);
}
sub to_string {
my $self = shift;
return '*' if $self->comparator eq '*';
return $self->version if $self->comparator eq '=';
return join '', $self->comparator, $self->version;
}
sub to_human_string { sprintf '%s %s', $COMPARATOR{$_[0]->comparator}, $_[0]->version }
sub TO_JSON { {version => $_[0]->version, comparator => $_[0]->comparator} }
1;
__END__
=head1 NAME
URI::VersionRange::Constraint - Version Constraint for Version Range Specification
=head1 SYNOPSIS
use URI::VersionRange::Constraint;
# OO-interface
$constraint = URI::VersionRange::Constraint->new(
comparator => '>',
version => '2.00'
);
say $constraint; # >2.00
# Parse "vers" string
$constraint = URI::VersionRange::Constraint->from_string('>2.00');
=head1 DESCRIPTION
A version range specifier (aka. "vers") is a URI string using the C<vers> URI-scheme with this syntax:
vers:<versioning-scheme>/<version-constraint>|<version-constraint>|...
C<vers> is the URI-scheme and is an acronym for "VErsion Range Specifier".
The pipe "|" is used as a simple separator between C<version-constraint>.
Each C<version-constraint> in this pipe-separated list contains a comparator and a version:
<comparator:version>
This list of C<version-constraint> are signposts in the version timeline of a package
that specify version intervals.
A C<version> satisfies a version range specifier if it is contained within any
of the intervals defined by these C<version-constraint>.
L<https://github.com/package-url/purl-spec>
=head2 OBJECT-ORIENTED INTERFACE
=over
=item $constraint = URI::VersionRange::Constraint->new( comparator => STRING, version => STRING )
Create new B<URI::VersionRange::Constraint> instance.
=item $constraint->comparator
Return the comparator.
=item $constraint->version
Return the version string.
=item $vers->to_string
Stringify C<vers> components.
=item $vers->to_human_string
Convert the constraint into human-readable format.
$constraint = URI::VersionRange::Constraint->new(
comparator => '>=',
version => '2.10'
);
say $constraint->to_human_string; # greater than or equal 2.10
=item $vers->TO_JSON
Helper method for JSON modules (L<JSON>, L<JSON::PP>, L<JSON::XS>, L<Mojo::JSON>, etc).
use Mojo::JSON qw(encode_json);
say encode_json($constraint); # {"comparator":">","version":"2.00"}
=item $vers = URI::VersionRange::Constraint->from_string($vers_string);
Converts the given "constraint" string to L<URI::VersionRange::Constraint> object. Croaks on error.
=back
=head1 SUPPORT
=head2 Bugs / Feature Requests
Please report any bugs or feature requests through the issue tracker
at L<https://github.com/giterlizzi/perl-URI-PackageURL/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/giterlizzi/perl-URI-PackageURL>
git clone https://github.com/giterlizzi/perl-URI-PackageURL.git
=head1 AUTHOR
=over 4
=item * Giuseppe Di Terlizzi <gdt@cpan.org>
=back
=head1 LICENSE AND COPYRIGHT
This software is copyright (c) 2022-2025 by Giuseppe Di Terlizzi.
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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