gistfile1.txt

class UserAgent
  attr_reader :browser, :version, :os
 
  def initialize(browser, version, os)
    @browser = browser
    @version = version
    @os = os
  end
 
  def self.parse(uas)
    browser, version = identify_browser_and_version(uas)
    os = identify_operating_system(uas)
    new browser, version, os
  end
 
  def self.identify_browser_and_version(uas)
    if uas.match(/Chrome/)
      ["Chrome", uas.scan(/Chrome\/(.[^\s;()\[\]]+)/).flatten.compact.push("Unknown").first.strip]
    elsif uas.match(/Safari\//)
      ["Safari", uas.scan(/Version\/(.[^\s;()\[\]]+)\s?|Safari\/(.[^\s;()\[\]]+)/).flatten.compact.push("Unknown").first.strip]
    elsif uas.match(/Firefox/)
      ["Firefox", uas.scan(/Firefox\/(.[^\s;()\[\]]+)/).flatten.compact.push("Unknown").first.strip]
    elsif uas.match(/Opera/)
      ["Opera", uas.scan(/Version\/(.[^\s;()\[\]]+)|Opera\/(.[^\s;()\[\]]+)\s|Opera\s(.[^\s;()\[\]]+)\s?/).flatten.compact.unshift("Unknown").last.strip]
    elsif uas.match(/MSIE/)
      ["Internet Explorer", uas.scan(/MSIE\s(.[^\s;()\[\]]+)\;/).flatten.compact.push("Unknown").first.strip]
    else
      if uas.match(/AppleWebKit/)
        ["Unknown Browser using WebKit", uas.scan(/AppleWebKit\/(.[^\s;()\[\]]+)/).flatten.compact.push("Unknown").first.strip]
      elsif uas.match(/KHTML/)
        ["Unknown Browser using KHTML", uas.scan(/KHTML\/(.[^\s;()\[\]]+)/).flatten.compact.push("Unknown").first.strip]
      elsif uas.match(/Gecko/)
        ["Unknown Browser using Gecko", uas.scan(/Gecko\/(.[^\s;()\[\]]+)/).flatten.compact.push("Unknown").first.strip]
      else
        ["", ""]
      end
    end
  end
 
  def self.identify_operating_system(uas)
    if uas.match(/Mac\sOS\sX/) || uas.match(/Mac_PowerPC/) || uas.match(/Macintosh/)
      macintosh_version(uas)
    elsif uas.match(/SunOS/)
      "SunOS"
    elsif uas.match(/OpenBSD/)
      "OpenBSD"
    elsif uas.match(/Linux/) || uas.match(/X11/)
      "Linux"
    elsif uas.match(/Win/)
      windows_version(uas)
    else
      ""
    end
  end
 
  def self.macintosh_version(uas)
    version = uas.scan(/Mac\sOS\sX\s(.[^\s;()\[\]]+)/).flatten.compact.push("").first.gsub("_", ".").strip
    version = case version.to_s
      when /10\.1/
        "Puma"
      when /10\.2/
        "Jaguar"
      when /10\.3/
        "Panther"
      when /10\.4/
        "Tiger"
      when /10\.5/
        "Leopard"
      when /10\.6/
        "Snow Leopard"
      else
        version
    end
    return "MacOSX #{version}".strip
  end
 
  def self.windows_version(uas)
    version = uas.scan(/Windows\sNT\s(.[^;()]+)|Windows\s(.[^;()]+)|WinNT(.[^;()]+)\;/).flatten.compact.push("").first.strip
    version = case version
      when "7.0" then " 7"
      when "6.0" then " Vista"
      when "5.2" then " Server 2003; Windows XP x64 Edition"
      when "5.1" then " XP"
      when "5.01" then " 2000, Service Pack 1 (SP1)"
      when "5.0" then " 2000"
      when "4.0" then " NT 4.0"
      when "98" then " 98"
      when "95" then " 95"
      when "CE" then " CE"
      else " #{version}"
    end
    return "Windows#{version}".strip
  end
 
  def browser_string
    if @version == "Unknown"
      @browser
    else
      "#{@browser} v#{@version}"
    end
  end
end