/* MIT license */
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var colorNames = require('color-name');
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var swizzle = require('simple-swizzle');
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var hasOwnProperty = Object.hasOwnProperty;
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var reverseNames = Object.create(null);
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// create a list of reverse color names
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for (var name in colorNames) {
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if (hasOwnProperty.call(colorNames, name)) {
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reverseNames[colorNames[name]] = name;
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}
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}
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var cs = module.exports = {
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to: {},
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get: {}
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};
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cs.get = function (string) {
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var prefix = string.substring(0, 3).toLowerCase();
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var val;
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var model;
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switch (prefix) {
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case 'hsl':
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val = cs.get.hsl(string);
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model = 'hsl';
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break;
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case 'hwb':
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val = cs.get.hwb(string);
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model = 'hwb';
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break;
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default:
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val = cs.get.rgb(string);
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model = 'rgb';
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break;
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}
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if (!val) {
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return null;
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}
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return {model: model, value: val};
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};
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cs.get.rgb = function (string) {
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if (!string) {
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return null;
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}
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var abbr = /^#([a-f0-9]{3,4})$/i;
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var hex = /^#([a-f0-9]{6})([a-f0-9]{2})?$/i;
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var rgba = /^rgba?\(\s*([+-]?\d+)(?=[\s,])\s*(?:,\s*)?([+-]?\d+)(?=[\s,])\s*(?:,\s*)?([+-]?\d+)\s*(?:[,|\/]\s*([+-]?[\d\.]+)(%?)\s*)?\)$/;
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var per = /^rgba?\(\s*([+-]?[\d\.]+)\%\s*,?\s*([+-]?[\d\.]+)\%\s*,?\s*([+-]?[\d\.]+)\%\s*(?:[,|\/]\s*([+-]?[\d\.]+)(%?)\s*)?\)$/;
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var keyword = /^(\w+)$/;
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var rgb = [0, 0, 0, 1];
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var match;
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var i;
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var hexAlpha;
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if (match = string.match(hex)) {
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hexAlpha = match[2];
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match = match[1];
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for (i = 0; i < 3; i++) {
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// https://jsperf.com/slice-vs-substr-vs-substring-methods-long-string/19
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var i2 = i * 2;
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rgb[i] = parseInt(match.slice(i2, i2 + 2), 16);
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}
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if (hexAlpha) {
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rgb[3] = parseInt(hexAlpha, 16) / 255;
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}
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} else if (match = string.match(abbr)) {
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match = match[1];
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hexAlpha = match[3];
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for (i = 0; i < 3; i++) {
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rgb[i] = parseInt(match[i] + match[i], 16);
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}
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if (hexAlpha) {
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rgb[3] = parseInt(hexAlpha + hexAlpha, 16) / 255;
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}
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} else if (match = string.match(rgba)) {
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for (i = 0; i < 3; i++) {
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rgb[i] = parseInt(match[i + 1], 0);
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}
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if (match[4]) {
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if (match[5]) {
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rgb[3] = parseFloat(match[4]) * 0.01;
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} else {
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rgb[3] = parseFloat(match[4]);
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}
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}
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} else if (match = string.match(per)) {
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for (i = 0; i < 3; i++) {
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rgb[i] = Math.round(parseFloat(match[i + 1]) * 2.55);
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}
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if (match[4]) {
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if (match[5]) {
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rgb[3] = parseFloat(match[4]) * 0.01;
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} else {
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rgb[3] = parseFloat(match[4]);
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}
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}
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} else if (match = string.match(keyword)) {
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if (match[1] === 'transparent') {
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return [0, 0, 0, 0];
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}
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if (!hasOwnProperty.call(colorNames, match[1])) {
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return null;
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}
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rgb = colorNames[match[1]];
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rgb[3] = 1;
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return rgb;
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} else {
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return null;
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}
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for (i = 0; i < 3; i++) {
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rgb[i] = clamp(rgb[i], 0, 255);
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}
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rgb[3] = clamp(rgb[3], 0, 1);
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return rgb;
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};
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cs.get.hsl = function (string) {
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if (!string) {
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return null;
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}
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var hsl = /^hsla?\(\s*([+-]?(?:\d{0,3}\.)?\d+)(?:deg)?\s*,?\s*([+-]?[\d\.]+)%\s*,?\s*([+-]?[\d\.]+)%\s*(?:[,|\/]\s*([+-]?(?=\.\d|\d)(?:0|[1-9]\d*)?(?:\.\d*)?(?:[eE][+-]?\d+)?)\s*)?\)$/;
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var match = string.match(hsl);
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if (match) {
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var alpha = parseFloat(match[4]);
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var h = ((parseFloat(match[1]) % 360) + 360) % 360;
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var s = clamp(parseFloat(match[2]), 0, 100);
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var l = clamp(parseFloat(match[3]), 0, 100);
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var a = clamp(isNaN(alpha) ? 1 : alpha, 0, 1);
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return [h, s, l, a];
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}
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return null;
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};
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cs.get.hwb = function (string) {
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if (!string) {
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return null;
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}
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var hwb = /^hwb\(\s*([+-]?\d{0,3}(?:\.\d+)?)(?:deg)?\s*,\s*([+-]?[\d\.]+)%\s*,\s*([+-]?[\d\.]+)%\s*(?:,\s*([+-]?(?=\.\d|\d)(?:0|[1-9]\d*)?(?:\.\d*)?(?:[eE][+-]?\d+)?)\s*)?\)$/;
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var match = string.match(hwb);
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if (match) {
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var alpha = parseFloat(match[4]);
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var h = ((parseFloat(match[1]) % 360) + 360) % 360;
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var w = clamp(parseFloat(match[2]), 0, 100);
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var b = clamp(parseFloat(match[3]), 0, 100);
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var a = clamp(isNaN(alpha) ? 1 : alpha, 0, 1);
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return [h, w, b, a];
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}
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return null;
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};
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cs.to.hex = function () {
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var rgba = swizzle(arguments);
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return (
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'#' +
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hexDouble(rgba[0]) +
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hexDouble(rgba[1]) +
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hexDouble(rgba[2]) +
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(rgba[3] < 1
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? (hexDouble(Math.round(rgba[3] * 255)))
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: '')
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);
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};
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cs.to.rgb = function () {
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var rgba = swizzle(arguments);
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return rgba.length < 4 || rgba[3] === 1
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? 'rgb(' + Math.round(rgba[0]) + ', ' + Math.round(rgba[1]) + ', ' + Math.round(rgba[2]) + ')'
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: 'rgba(' + Math.round(rgba[0]) + ', ' + Math.round(rgba[1]) + ', ' + Math.round(rgba[2]) + ', ' + rgba[3] + ')';
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};
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cs.to.rgb.percent = function () {
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var rgba = swizzle(arguments);
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var r = Math.round(rgba[0] / 255 * 100);
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var g = Math.round(rgba[1] / 255 * 100);
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var b = Math.round(rgba[2] / 255 * 100);
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return rgba.length < 4 || rgba[3] === 1
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? 'rgb(' + r + '%, ' + g + '%, ' + b + '%)'
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: 'rgba(' + r + '%, ' + g + '%, ' + b + '%, ' + rgba[3] + ')';
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};
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cs.to.hsl = function () {
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var hsla = swizzle(arguments);
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return hsla.length < 4 || hsla[3] === 1
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? 'hsl(' + hsla[0] + ', ' + hsla[1] + '%, ' + hsla[2] + '%)'
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: 'hsla(' + hsla[0] + ', ' + hsla[1] + '%, ' + hsla[2] + '%, ' + hsla[3] + ')';
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};
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// hwb is a bit different than rgb(a) & hsl(a) since there is no alpha specific syntax
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// (hwb have alpha optional & 1 is default value)
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cs.to.hwb = function () {
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var hwba = swizzle(arguments);
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var a = '';
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if (hwba.length >= 4 && hwba[3] !== 1) {
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a = ', ' + hwba[3];
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}
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return 'hwb(' + hwba[0] + ', ' + hwba[1] + '%, ' + hwba[2] + '%' + a + ')';
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};
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cs.to.keyword = function (rgb) {
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return reverseNames[rgb.slice(0, 3)];
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};
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// helpers
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function clamp(num, min, max) {
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return Math.min(Math.max(min, num), max);
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}
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function hexDouble(num) {
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var str = Math.round(num).toString(16).toUpperCase();
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return (str.length < 2) ? '0' + str : str;
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}
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