/**
* For parsing color values
* @module RGBColor
* @author Stoyan Stefanov <sstoo@gmail.com>
* @see https://www.phpied.com/rgb-color-parser-in-javascript/
* @license MIT
*/
const simpleColors = {
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'
};
// array of color definition objects
const colorDefs = [
{
re: /^rgb\((\d{1,3}),\s*(\d{1,3}),\s*(\d{1,3})\)$/,
// re: /^rgb\((?<r>\d{1,3}),\s*(?<g>\d{1,3}),\s*(?<b>\d{1,3})\)$/,
example: ['rgb(123, 234, 45)', 'rgb(255,234,245)'],
process (_, ...bits) {
return bits.map((b) => parseInt(b));
}
},
{
re: /^(\w{2})(\w{2})(\w{2})$/,
// re: /^(?<r>\w{2})(?<g>\w{2})(?<b>\w{2})$/,
example: ['#00ff00', '336699'],
process (_, ...bits) {
return bits.map((b) => parseInt(b, 16));
}
},
{
re: /^(\w{1})(\w{1})(\w{1})$/,
// re: /^(?<r>\w{1})(?<g>\w{1})(?<b>\w{1})$/,
example: ['#fb0', 'f0f'],
process (_, ...bits) {
return bits.map((b) => parseInt(b + b, 16));
}
}
];
/**
* A class to parse color values.
*/
export default class RGBColor {
/**
* @param {string} colorString
*/
constructor (colorString) {
this.ok = false;
// strip any leading #
if (colorString.charAt(0) === '#') { // remove # if any
colorString = colorString.substr(1, 6);
}
colorString = colorString.replace(/ /g, '');
colorString = colorString.toLowerCase();
// before getting into regexps, try simple matches
// and overwrite the input
if (colorString in simpleColors) {
colorString = simpleColors[colorString];
}
// end of simple type-in colors
// search through the definitions to find a match
colorDefs.forEach(({re, process: processor}) => {
const bits = re.exec(colorString);
if (bits) {
const [r, g, b] = processor(...bits);
Object.assign(this, {r, g, b});
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
/**
* @returns {string}
*/
toRGB () {
return 'rgb(' + this.r + ', ' + this.g + ', ' + this.b + ')';
}
/**
* @returns {string}
*/
toHex () {
let r = this.r.toString(16);
let g = this.g.toString(16);
let 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;
}
/**
* Offers a bulleted list of help.
* @returns {HTMLUListElement}
*/
static getHelpXML () {
const examples = [
// add regexps
...colorDefs.flatMap(({example}) => {
return example;
}),
// add type-in colors
...Object.keys(simpleColors)
];
const xml = document.createElement('ul');
xml.setAttribute('id', 'rgbcolor-examples');
xml.append(...examples.map((example) => {
try {
const listItem = document.createElement('li');
const listColor = new RGBColor(example);
const exampleDiv = document.createElement('div');
exampleDiv.style.cssText = `
margin: 3px;
border: 1px solid black;
background: ${listColor.toHex()};
color: ${listColor.toHex()};`;
exampleDiv.append('test');
const listItemValue = ` ${example} -> ${listColor.toRGB()} -> ${listColor.toHex()}`;
listItem.append(exampleDiv, listItemValue);
return listItem;
} catch (e) {
return '';
}
}));
return xml;
}
}