this.ok = false;

// strip any leading #

if (color_string.charAt(0) == '#') { // remove # if any

color_string = color_string.substr(1, 6);

}

color_string = color_string.replace(/ /g, '');

color_string = color_string.toLowerCase();

// before getting into regexps, try simple matches

// and overwrite the input

var simple_colors = {

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',

darkkhaki: 'bdb76b',

darkmagenta: '8b008b',

darkolivegreen: '556b2f',

darkorange: 'ff8c00',

darkorchid: '9932cc',

darkred: '8b0000',

darksalmon: 'e9967a',

darkseagreen: '8fbc8f',

darkslateblue: '483d8b',

darkslategray: '2f4f4f',

darkturquoise: '00ced1',

darkviolet: '9400d3',

deeppink: 'ff1493',

deepskyblue: '00bfff',

dimgray: '696969',

dodgerblue: '1e90ff',

feldspar: 'd19275',

firebrick: 'b22222',

floralwhite: 'fffaf0',

forestgreen: '228b22',

fuchsia: 'ff00ff',

gainsboro: 'dcdcdc',

ghostwhite: 'f8f8ff',

gold: 'ffd700',

goldenrod: 'daa520',

gray: '808080',

green: '008000',

greenyellow: 'adff2f',

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',

lightgrey: 'd3d3d3',

lightgreen: '90ee90',

lightpink: 'ffb6c1',

lightsalmon: 'ffa07a',

lightseagreen: '20b2aa',

lightskyblue: '87cefa',

lightslateblue: '8470ff',

lightslategray: '778899',

lightsteelblue: 'b0c4de',

lightyellow: 'ffffe0',

lime: '00ff00',

limegreen: '32cd32',

linen: 'faf0e6',

magenta: 'ff00ff',

maroon: '800000',

mediumaquamarine: '66cdaa',

mediumblue: '0000cd',

mediumorchid: 'ba55d3',

mediumpurple: '9370d8',

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: 'd87093',

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',

snow: 'fffafa',

springgreen: '00ff7f',

steelblue: '4682b4',

tan: 'd2b48c',

teal: '008080',

thistle: 'd8bfd8',

tomato: 'ff6347',

turquoise: '40e0d0',

violet: 'ee82ee',

violetred: 'd02090',

wheat: 'f5deb3',

white: 'ffffff',

whitesmoke: 'f5f5f5',

yellow: 'ffff00',

yellowgreen: '9acd32'

};

for (var key in simple_colors) {

if (color_string == key) {

color_string = simple_colors[key];

}

}

// emd of simple type-in colors

// array of color definition objects

var color_defs = [

{

re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,

example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],

process: function (bits) {

return [

parseInt(bits[1]),

parseInt(bits[2]),

parseInt(bits[3])

];

}

},

{

re: /^(\w{2})(\w{2})(\w{2})$/,

example: ['#00ff00', '336699'],

process: function (bits) {

return [

parseInt(bits[1], 16),

parseInt(bits[2], 16),

parseInt(bits[3], 16)

];

}

},

{

re: /^(\w{1})(\w{1})(\w{1})$/,

example: ['#fb0', 'f0f'],

process: function (bits) {

return [

parseInt(bits[1] + bits[1], 16),

parseInt(bits[2] + bits[2], 16),

parseInt(bits[3] + bits[3], 16)

];

}

}

];

// search through the definitions to find a match

for (var i = 0; i < color_defs.length; i++) {

var re = color_defs[i].re;

var processor = color_defs[i].process;

var bits = re.exec(color_string);

if (bits) {

channels = processor(bits);

this.r = channels[0];

this.g = channels[1];

this.b = channels[2];

this.ok = true;

}

}

// validate/cleanup values

this.r = (this.r < 0 || isNaN(this.r)) ? 0 : ((this.r > 255) ? 255 : this.r);

this.g = (this.g < 0 || isNaN(this.g)) ? 0 : ((this.g > 255) ? 255 : this.g);

this.b = (this.b < 0 || isNaN(this.b)) ? 0 : ((this.b > 255) ? 255 : this.b);

// some getters

this.toRGB = function () {

return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';

}

this.toHex = function () {

var r = this.r.toString(16);

var g = this.g.toString(16);

var b = this.b.toString(16);

if (r.length == 1) r = '0' + r;

if (g.length == 1) g = '0' + g;

if (b.length == 1) b = '0' + b;

return '#' + r + g + b;

}

// help

this.getHelpXML = function () {

var examples = [];

// add regexps

for (var i = 0; i < color_defs.length; i++) {

var example = color_defs[i].example;

for (var j = 0; j < example.length; j++) {

examples[examples.length] = example[j];

}

}

// add type-in colors

for (var sc in simple_colors) {

examples[examples.length] = sc;

}

var xml = document.createElement('ul');

xml.setAttribute('id', 'rgbcolor-examples');

for (var i = 0; i < examples.length; i++) {

try {

var list_item = document.createElement('li');

var list_color = new RGBColor(examples[i]);

var example_div = document.createElement('div');

example_div.style.cssText =

'margin: 3px; '

+ 'border: 1px solid black; '

+ 'background:' + list_color.toHex() + '; '

+ 'color:' + list_color.toHex()

;

example_div.appendChild(document.createTextNode('test'));

var list_item_value = document.createTextNode(

' ' + examples[i] + ' -> ' + list_color.toRGB() + ' -> ' + list_color.toHex()

);

list_item.appendChild(example_div);

list_item.appendChild(list_item_value);

xml.appendChild(list_item);

} catch (e) {

}

}

return xml;

}