class Gem::NameTuple

def self.from_list(list)
  list.map {|t| new(*t) }
end

def self.null
  new nil, Gem::Version.new(0), nil
end

def self.to_basic(list)
  list.map {|t| t.to_a }
end

def <=>(other)
  [@name, @version, @platform == Gem::Platform::RUBY ? -1 : 1] <=>
    [other.name, other.version,
     other.platform == Gem::Platform::RUBY ? -1 : 1]
end

def ==(other)
  case other
  when self.class
    @name == other.name and
      @version == other.version and
      @platform == other.platform
  when Array
    to_a == other
  else
    false
  end
end

def full_name
  case @platform
  when nil, 'ruby', ''
    "#{@name}-#{@version}"
  else
    "#{@name}-#{@version}-#{@platform}"
  end.dup.tap(&Gem::UNTAINT)
end

def hash
  to_a.hash
end

def initialize(name, version, platform="ruby")
  @name = name
  @version = version
  unless platform.kind_of? Gem::Platform
    platform = "ruby" if !platform or platform.empty?
  end
  @platform = platform
end

def inspect # :nodoc:
  "#<Gem::NameTuple #{@name}, #{@version}, #{@platform}>"
end

def match_platform?
  Gem::Platform.match_gem? @platform, @name
end

def prerelease?
  @version.prerelease?
end

def spec_name
  "#{full_name}.gemspec"
end

def to_a
  [@name, @version, @platform]
end