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