You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: platform.rb
    path of file: ./repos/chef/lib/chef/version
    
    the code of the file until where you have to start completion: # Author:: Xabier de Zuazo (<xabier@onddo.com>)
# Copyright:: Copyright 2013-2016, Onddo Labs, SL.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/
    
      def parse(str = "")
        @major, @minor, @patch =
          case str.to_s
          when /^(\d+)\.(\d+)\.(\d+)$/
            [ $1.to_i, $2.to_i, $3.to_i ]
          when /^(\d+)\.(\d+)$/
            [ $1.to_i, $2.to_i, 0 ]
          when /^(\d+)$/
            [ $1.to_i, 0, 0 ]
          when /^(\d+).(\d+)-[a-z]+\d?(-p(\d+))?$/i # Match FreeBSD
            [ $1.to_i, $2.to_i, ($4 ? $4.to_i : 0)]
          else
            msg = "'#{str}' does not match 'x.y.z', 'x.y' or 'x'"
            raise Chef::Exceptions::InvalidPlatformVersion.new( msg )
          end
      end