Module: SimpleColor::RGB::Parsers

Included in:
SimpleColor::RGB
Defined in:
lib/simplecolor/rgb.rb

Instance Method Summary collapse

Instance Method Details

#parse(col, color_names: proc {|c| find_color(c)}) ⇒ Object 



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# File 'lib/simplecolor/rgb.rb', line 28

def parse(col, color_names: proc {|c| find_color(c)})
	case col
	when self
		return col
	when Proc
		scol=col.call(self)
		return parse(scol, color_names: color_names)
	when Symbol
		if ANSI_COLORS_16.key?(col)
			return self.new(col, mode: 16)
		end
	when Array
		return self.new(col, mode: true)
	when String
		if (m=col.match(/\A(?:rgb)?256[+:-]?(?<grey>gr[ae]y)?(?<red>\d+)(?:[+:-](?<green>\d+)[+:-](?<blue>\d+))?\z/))
			grey=m[:grey]; red=m[:red]&.to_i; green=m[:green]&.to_i; blue=m[:blue]&.to_i
			if grey
				return self.new(GREY256+red, mode: 256)
			elsif green and blue
				return self.new([red, green, blue], mode: 256)
			else
				raise WrongRGBColor.new(col) if green
				return self.new(red, mode: 256)
			end
		elsif (m=col.match(/\A(?:rgb[+:-]?)?(?<red>\d+)[+:-](?<green>\d+)[+:-](?<blue>\d+)\z/))
			red=m[:red]&.to_i; green=m[:green]&.to_i; blue=m[:blue]&.to_i
			return self.new([red, green, blue], mode: :truecolor)
		elsif (m=col.match(/\A#?(?<hex_color>[[:xdigit:]]{3}{1,2})\z/)) # 3 or 6 hex chars
			return self.new(rgb_hex(m[:hex_color]), mode: :truecolor)
		end
	end
	if color_names && (c=color_names[col])
		return self.parse(c, color_names: nil)
	else
		# fallback to parsing col.to_s?
		raise WrongRGBColor.new(col)
	end
end

#rgb_hex(string) ⇒ Object

Creates RGB color from a HTML-like color definition string



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# File 'lib/simplecolor/rgb.rb', line 17

def rgb_hex(string)
	case string.size
	when 6
		string.each_char.each_slice(2).map{ |hex_color| hex_color.join.to_i(16) }
	when 3
		string.each_char.map{ |hex_color_half| (hex_color_half*2).to_i(16) }
	else
		raise WrongRGBColor.new(string)
	end
end