File indexing completed on 2023-12-03 12:04:06

 # frozen_string_literal: true
 #
 # Copyright (C) 2015-2016 Harald Sitter <sitter@kde.org>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
 # License as published by the Free Software Foundation; either
 # version 2.1 of the License, or (at your option) version 3, or any
 # later version accepted by the membership of KDE e.V. (or its
 # successor approved by the membership of KDE e.V.), which shall
 # act as a proxy defined in Section 6 of version 3 of the license.
 #
 # This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public
 # License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 module Debian
   # A debian policy version handling class.
   class Version
     attr_accessor :epoch
     attr_accessor :upstream
     attr_accessor :revision
 
     def initialize(string)
       @epoch = nil
       @upstream = nil
       @revision = nil
       parse(string)
     end
 
     def full
       comps = []
       comps << "#{epoch}:" if epoch
       comps << upstream
       comps << "-#{revision}" if revision
       comps.join
     end
 
     def to_s
       full
     end
 
     # We could easily reimplement version comparision from Version.pm, but
     # it's mighty ugh because of string components, so in order to not run into
     # problems down the line, let's just consult with dpkg for now.
     def <=>(other)
       return 0 if full == other.full
       return 1 if compare_version(full, 'gt', other.full)
       return -1 if compare_version(full, 'lt', other.full)
       # A version can be stringwise different but have the same weight.
       # Make sure we cover that.
       return 0 if compare_version(full, 'eq', other.full)
     end
 
     private
 
     def compare_version(ours, op, theirs)
       run('--compare-versions', ours, op, theirs)
     end
 
     def run(*args)
       system('dpkg', *args)
     end
 
     def parse(string)
       regex = /^(?:(?<epoch>\d+):)?
                 (?<upstream>[A-Za-z0-9.+:~-]+?)
                 (?:-(?<revision>[A-Za-z0-9.~+]+))?$/x
       match = string.match(regex)
       @epoch = match[:epoch]
       @upstream = match[:upstream]
       @revision = match[:revision]
     end
   end
 end