class Magick::RVG::Styles

Styles is a Struct class with a couple of extra methods

def deep_copy(_h = nil)

The "usual" deep_copy method doesn't copy a Struct correctly. 
def deep_copy(_h = nil)
  copy = Styles.new
  each_pair { |style, value| copy[style] = value }
  copy
end

def each_value

Iterate over the style names. Yield for each style that has a value. 
def each_value
  each_pair do |style, value|
    yield(style, value) if value
  end
end

def set(styles) 

def set(styles)
  begin
    styles.each_pair do |style, value|
      begin
        self[style] = value
      rescue NoMethodError
        raise ArgumentError, "unknown style `#{style}'"
      end
    end
  rescue NoMethodError
    raise ArgumentError, "style arguments must be in the form `style => value'"
  end
  self
end