Class: WurflDevice::UserAgentMatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/wurfl_device/user_agent_matcher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#capabilities ⇒ Object

Returns the value of attribute capabilities.



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# File 'lib/wurfl_device/user_agent_matcher.rb', line 6

def capabilities
  @capabilities
end

#user_agent ⇒ Object

Returns the value of attribute user_agent.



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# File 'lib/wurfl_device/user_agent_matcher.rb', line 6

def user_agent
  @user_agent
end

Instance Method Details

#ld_match(user_agent, tolerance = nil) ⇒ Object 



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# File 'lib/wurfl_device/user_agent_matcher.rb', line 72

def ld_match(user_agent, tolerance=nil)
  tolerance = Settings::WORST_MATCH if tolerance.nil?
  user_agent_list = Cache::UserAgentsManufacturers.hkeys(user_agent.manufacturer).sort
  length = user_agent.length
  best = tolerance
  current = 0
  match = nil
  user_agent_list.each do |ua|
    next unless ua.length.between?(length - tolerance, length + tolerance)
    current = Text::Levenshtein.distance(ua, user_agent)
    if current <= best
      best = current
      match = ua
    end
  end
  return match unless match.nil?
  return nil
end

#match(user_agent) ⇒ Object 



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# File 'lib/wurfl_device/user_agent_matcher.rb', line 8

def match(user_agent)
  user_agent = UserAgent.new(user_agent) unless user_agent.kind_of?(UserAgent)

  @user_agent = user_agent.dup

  # exact match
  matched_data = Cache::UserAgentsMatched.get(@user_agent)
  unless matched_data.nil?
    @capabilities = Capability.new(MessagePack.unpack(matched_data.force_encoding('US-ASCII')))
    if !(@capabilities.nil? || @capabilities.empty?)
      return self
    end
  end

  matched_ua = nil
  matcher = "matcher_#{@user_agent.manufacturer.downcase}"
  if self.respond_to?(matcher)
    matched_ua = self.send(matcher, @user_agent)
  else
    if @user_agent =~ /^Mozilla/i
      tolerance = 5
      matched_ua = ld_match(@user_agent, tolerance)
    else
      tolerance = @user_agent.first_slash
      matched_ua = ris_match(@user_agent, tolerance)
    end
  end

  unless matched_ua.nil?
    device_id = Cache::UserAgents.get(matched_ua)
    device_id = Settings::GENERIC_XHTML if device_id.nil? || device_id.empty?
    @capabilities = Cache.build_capabilities(device_id)
  end

  if @capabilities.nil? || @capabilities.empty?
    device_id = Cache::UserAgents.get(last_attempts(@user_agent))
    device_id = Settings::GENERIC_XHTML if device_id.nil? || device_id.empty?
    @capabilities = Cache.build_capabilities(device_id)
  end

  if !(@capabilities.nil? || @capabilities.empty?)
    Cache::UserAgentsMatched.set @user_agent, MessagePack.pack(@capabilities)
  end

  return self
end

#ris_match(user_agent, tolerance = nil) ⇒ Object 



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# File 'lib/wurfl_device/user_agent_matcher.rb', line 55

def ris_match(user_agent, tolerance=nil)
  tolerance = Settings::WORST_MATCH if tolerance.nil?
  user_agent_list = Cache::UserAgentsManufacturers.hkeys(user_agent.manufacturer).sort
  curlen = user_agent.length
  while curlen >= tolerance
    user_agent_list.each do |ua|
      next if ua.length < curlen
      if ua.index(user_agent) == 0
        return ua
      end
    end
    user_agent = user_agent.slice(0, curlen-1)
    curlen = user_agent.length
  end
  return nil
end