CoffeeScript Color parser

color.coffee

PopKit.Color = SC.Object.extend SC.Copyable,
  rgb: (->
    PopKit.Color.hsbToRgb(@get("hsb"))
  ).property("hsb")
  
  copy: -> PopKit.Color.create(hsb: @get("hsb"))

PopKit.Color.reopenClass
  hsbToRgb: (hsb) ->
    [h, s, b] = hsb
    br = Math.round(b / 100 * 255)
    
    if s == 0
      [br, br, br]
    else
      hue = h % 360
      f = hue % 60
      p = Math.round((hsb[2] * (100 - s)) / 10000 * 255)
      q = Math.round((hsb[2] * (6000 - s * f)) / 600000 * 255)
      t = Math.round((hsb[2] * (6000 - s * (60 - f))) / 600000 * 255)
      switch Math.floor(hue / 60)
        when 0 then [br, t, p]
        when 1 then [q, br, p]
        when 2 then [p, br, t]
        when 3 then [p, q, br]
        when 4 then [t, p, br]
        when 5 then [br, p, q]
        else false

  rgbToHsb: (rgb) ->
    [red, green, blue] = rgb
    hue = 0
    
    max = Math.max(red, green, blue)
    min = Math.min(red, green, blue)
        
    delta = max - min
    brightness = max / 255
    saturation = if (max != 0) then (delta / max) else 0
    
    if saturation != 0
      rr = (max - red) / delta
      gr = (max - green) / delta
      br = (max - blue) / delta
      if (red == max) 
        hue = br - gr
      else if (green == max) 
        hue = 2 + rr - br
      else 
        hue = 4 + gr - rr
      hue /= 6
      if (hue < 0) 
        hue++
    
    [
      Math.round(hue * 360)
      Math.round(saturation * 100)
      Math.round(brightness * 100)
    ]

  hexToRgba: (hexString) ->
    hex = hexString.match(/^#?(\w{1,2})(\w{1,2})(\w{1,2})(\w{1,2})?$/)
    hex[4] ||= "ff"
    
    parts = for part in hex.slice(1)
      part += part if part.length == 1
      parseInt(part, 16)
  
  nameMap:
    aliceblue: "#F0F8FF"
    antiquewhite: "#FAEBD7"
    aqua: "#00FFFF"
    aquamarine: "#7FFFD4"
    azure: "#F0FFFF"
    beige: "#F5F5DC"
    bisque: "#FFE4C4"
    black: "#000000"
    blanchedalmond: "#FFEBCD"
    blue: "#0000FF"
    blueviolet: "#8A2BE2"
    brown: "#A52A2A"
    burlywood: "#DEB887"
    cadetblue: "#5F9EA0"
    chartreuse: "#7FFF00"
    chocolate: "#D2691E"
    coral: "#FF7F50"
    cornflowerblue: "#6495ED"
    cornsilk: "#FFF8DC"
    crimson: "#DC143C"
    cyan: "#00FFFF"
    darkblue: "#00008B"
    darkcyan: "#008B8B"
    darkgoldenrod: "#B8860B"
    darkgray: "#A9A9A9"
    darkgreen: "#006400"
    darkgrey: "#A9A9A9"
    darkkhaki: "#BDB76B"
    darkmagenta: "#8B008B"
    darkolivegreen: "#556B2F"
    darkorange: "#FF8C00"
    darkorchid: "#9932CC"
    darkred: "#8B0000"
    darksalmon: "#E9967A"
    darkseagreen: "#8FBC8F"
    darkslateblue: "#483D8B"
    darkslategray: "#2F4F4F"
    darkslategrey: "#2F4F4F"
    darkturquoise: "#00CED1"
    darkviolet: "#9400D3"
    deeppink: "#FF1493"
    deepskyblue: "#00BFFF"
    dimgray: "#696969"
    dimgrey: "#696969"
    dodgerblue: "#1E90FF"
    firebrick: "#B22222"
    floralwhite: "#FFFAF0"
    forestgreen: "#228B22"
    fuchsia: "#FF00FF"
    gainsboro: "#DCDCDC"
    ghostwhite: "#F8F8FF"
    gold: "#FFD700"
    goldenrod: "#DAA520"
    gray: "#808080"
    green: "#008000"
    greenyellow: "#ADFF2F"
    grey: "#808080"
    honeydew: "#F0FFF0"
    hotpink: "#FF69B4"
    indianred: "#CD5C5C"
    indigo: "#4B0082"
    ivory: "#FFFFF0"
    khaki: "#F0E68C"
    lavender: "#E6E6FA"
    lavenderblush: "#FFF0F5"
    lawngreen: "#7CFC00"
    lemonchiffon: "#FFFACD"
    lightblue: "#ADD8E6"
    lightcoral: "#F08080"
    lightcyan: "#E0FFFF"
    lightgoldenrodyellow: "#FAFAD2"
    lightgray: "#D3D3D3"
    lightgreen: "#90EE90"
    lightgrey: "#D3D3D3"
    lightpink: "#FFB6C1"
    lightsalmon: "#FFA07A"
    lightseagreen: "#20B2AA"
    lightskyblue: "#87CEFA"
    lightslategray: "#778899"
    lightslategrey: "#778899"
    lightsteelblue: "#B0C4DE"
    lightyellow: "#FFFFE0"
    lime: "#00FF00"
    limegreen: "#32CD32"
    linen: "#FAF0E6"
    magenta: "#FF00FF"
    maroon: "#800000"
    mediumaquamarine: "#66CDAA"
    mediumblue: "#0000CD"
    mediumorchid: "#BA55D3"
    mediumpurple: "#9370DB"
    mediumseagreen: "#3CB371"
    mediumslateblue: "#7B68EE"
    mediumspringgreen: "#00FA9A"
    mediumturquoise: "#48D1CC"
    mediumvioletred: "#C71585"
    midnightblue: "#191970"
    mintcream: "#F5FFFA"
    mistyrose: "#FFE4E1"
    moccasin: "#FFE4B5"
    navajowhite: "#FFDEAD"
    navy: "#000080"
    oldlace: "#FDF5E6"
    olive: "#808000"
    olivedrab: "#6B8E23"
    orange: "#FFA500"
    orangered: "#FF4500"
    orchid: "#DA70D6"
    palegoldenrod: "#EEE8AA"
    palegreen: "#98FB98"
    paleturquoise: "#AFEEEE"
    palevioletred: "#DB7093"
    papayawhip: "#FFEFD5"
    peachpuff: "#FFDAB9"
    peru: "#CD853F"
    pink: "#FFC0CB"
    plum: "#DDA0DD"
    powderblue: "#B0E0E6"
    purple: "#800080"
    red: "#FF0000"
    rosybrown: "#BC8F8F"
    royalblue: "#4169E1"
    saddlebrown: "#8B4513"
    salmon: "#FA8072"
    sandybrown: "#F4A460"
    seagreen: "#2E8B57"
    seashell: "#FFF5EE"
    sienna: "#A0522D"
    silver: "#C0C0C0"
    skyblue: "#87CEEB"
    slateblue: "#6A5ACD"
    slategray: "#708090"
    slategrey: "#708090"
    snow: "#FFFAFA"
    springgreen: "#00FF7F"
    steelblue: "#4682B4"
    tan: "#D2B48C"
    teal: "#008080"
    thistle: "#D8BFD8"
    tomato: "#FF6347"
    turquoise: "#40E0D0"
    violet: "#EE82EE"
    wheat: "#F5DEB3"
    white: "#FFFFFF"
    whitesmoke: "#F5F5F5"
    yellow: "#FFFF00"
    yellowgreen: "#9ACD32"

  nameToRgba: (name) -> 
    @hexToRgba(@nameMap[name])
    
  rgbToHex: (args...) ->
    args[3] = Math.ceil(args[3] * 255) if args[3]
  
    hex = for arg in args
      bit = (arg - 0).toString(16)
      
      if (bit.length == 1)
        "0#{bit}"
      else
        bit
    
    "##{hex.join('')}"