SmartMirror-Projektarbeit/node_modules/rgb2hex/rgb2hex.js

;(function(window) {

    var rgb2hex = function(color) {

        if(typeof color !== 'string') {
            // throw error of input isn't typeof string
            throw new Error('color has to be type of `string`');
        } else if (color.substr(0, 1) === '#') {
            // or return if already rgb color
            return {
                hex: color,
                alpha: 1
            };
        }

        /**
         * strip spaces
         */
        var strippedColor = color.replace(/\s+/g,'');

        /**
         * parse input
         */
        var digits = /(.*?)rgb(a)??\((\d{1,3}),(\d{1,3}),(\d{1,3})(,([01]|1.0*|0??\.([0-9]{0,})))??\)/.exec(strippedColor);

        if(!digits) {
            // or throw error if input isn't a valid rgb(a) color
            throw new Error('given color (' + color + ') isn\'t a valid rgb or rgba color');
        }

        var red = parseInt(digits[3], 10);
        var green = parseInt(digits[4], 10);
        var blue = parseInt(digits[5], 10);
        var alpha = digits[6] ? /([0-9\.]+)/.exec(digits[6])[0] : '1';
        var rgb = ((blue | green << 8 | red << 16) | 1 << 24).toString(16).slice(1);

        // parse alpha value into float
        if(alpha.substr(0,1) === '.') {
            alpha = parseFloat('0' + alpha);
        }

        // limit alpha value to 1
        if(alpha > 1) {
            alpha = 1;
        }

        // cut alpha value after 2 digits after comma
        alpha = parseFloat(Math.round(alpha * 100)) / 100;

        return {
            hex: '#' + rgb.toString(16),
            alpha: alpha
        };

    };

    if(typeof define === 'function' && define.amd) {
        define('rgb2hex', function () {
            return rgb2hex;
        });
    } else {
        window.rgb2hex = rgb2hex;
    }

}(window));