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 }
    return 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