NAME

VERS - Support for the VErsion Range Specifier URI scheme

SYNOPSIS

use VERS;

my $vers = VERS.new("vers:raku/>=1.0");
say v1.0 ~~ $vers;  # True
say v0.9 ~~ $vers;  # False

DESCRIPTION

The VERS distribution provides an implementation of the VErsion Range Specifier scheme, as described in the PURL specification.

It is intended to provide support for version checking for all software types supported by the Package URL standard.

It currently supports all software packages that use the same version logic as Raku (based on Version object comparison semantics).

VERS

my $vers = VERS.new("vers:raku/>=1.0");
say v1.0 ~~ $vers;  # True
say v0.9 ~~ $vers;  # False

The Vers class encapsulates the logic for parsing VERS specification strings and is intended to be used as a target in a smart-match to verify whether a given version is matched by the vers specification.

An error will be thrown if the given vers specification is not valid.

The VERS object stringifies to the canonical representation of the vers specification.

say VERS("vers:raku/>=1.0");  # True
say VERS("foobar");           # False

If one is only interested in whether a vers string is valid or not, one can call the VERS class object with the vers string: it will return True if the vers string is valid, and False if it is not.

method new

# accept any version 1.x below 2.0
my $from-string = VERS.new("vers:raku/>=1.0|<2.0");

my $from-nameds = VERS.new(:type<raku>, :constraints(v1.0+, "<2.0"));

The new method can be called to create a new VERS object. It either takes a vers specification string, or it can be called using normal named arguments semantics. In the latter case, it expects the :type and :constraints named arguments to be specified. Note that when using named arguments, the :constraints named arguments expects one of more strings or Version objects.

method from-Version

# accept any version equal to or higher than 1.x
my $vers = VERS.from-Version(v1.0+);
say $vers;  # vers:raku/>=1.0

The from-Version method can be called to create a new VERS object from a Version object.

HELPER CLASSES

VersionConstraint

my $from-spec = VersionConstraint.new("!=1.0");

my $from-nameds = VersionConstraint.new(
  :comparator<!=>, :version<1.0>
);

The VersionConstraint class encapsulates the logic needed to check a single constraint. Its instances can be used as arguments to the :constraints named argument to VERS.new.

It can either be instantiated by a vers version constraint, or by named arguments. In the latter case, the optional :comparator named argument expects a string representing the comparator to be used (any of: ==, !=, <, <=, >, >=, defaulting to ==). The required :version named argument should be either a Version object or a string representing a version.

AUTHOR

Elizabeth Mattijsen liz@raku.rocks

Source can be located at: https://github.com/lizmat/VERS . Comments and Pull Requests are welcome.

If you like this module, or what I’m doing more generally, committing to a small sponsorship would mean a great deal to me!

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.