Function toString

src/common/style/CartoCSS.js:2941–2946

(env)

            color: color,
            mode: mode,
            toString(env) {
                return '\n\t<stop value="' + val.ev(env) + '"' +
                    (color ? ' color="' + color.ev(env) + '" ' : '') +
                    (mode ? ' mode="' + mode.ev(env) + '" ' : '') +
                    '/>';
            }
        };
    },
    hsl: function (h, s, l) {