chroma-js/src/io/css/hsl2css.js

JavaScript library for color conversions

const {unpack, last} = require('../../utils');
const rnd = (a) => Math.round(a*100)/100;

/*
 * supported arguments:
 * - hsl2css(h,s,l)
 * - hsl2css(h,s,l,a)
 * - hsl2css([h,s,l], mode)
 * - hsl2css([h,s,l,a], mode)
 * - hsl2css({h,s,l,a}, mode)
 */
const hsl2css = (...args) => {
    const hsla = unpack(args, 'hsla');
    let mode = last(args) || 'lsa';
    hsla[0] = rnd(hsla[0] || 0);
    hsla[1] = rnd(hsla[1]*100) + '%';
    hsla[2] = rnd(hsla[2]*100) + '%';
    if (mode === 'hsla' || (hsla.length > 3 && hsla[3]<1)) {
        hsla[3] = hsla.length > 3 ? hsla[3] : 1;
        mode = 'hsla';
    } else {
        hsla.length = 3;
    }
    return `${mode}(${hsla.join(',')})`;
}

module.exports = hsl2css;