common.js

function rgbToHex(r, g, b) {
    return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
}

function colorFromString(value) {
    var immutable = MSImmutableColor.colorWithSVGString_(value);
    return MSColor.alloc().initWithImmutableObject_(immutable);
}