public function addRoute(string $prefix, $route)
    {
        list($prefix, $staticPrefix) = $this->getCommonPrefix($prefix, $prefix);

        for ($i = \count($this->items) - 1; 0 <= $i; --$i) {
            $item = $this->items[$i];

            list($commonPrefix, $commonStaticPrefix) = $this->getCommonPrefix($prefix, $this->prefixes[$i]);

            if ($this->prefix === $commonPrefix) {
                // the new route and a previous one have no common prefix, let's see if they are exclusive to each others

                if ($this->prefix !== $staticPrefix && $this->prefix !== $this->staticPrefixes[$i]) {
                    // the new route and the previous one have exclusive static prefixes
                    continue;
                }

                if ($this->prefix === $staticPrefix && $this->prefix === $this->staticPrefixes[$i]) {
                    // the new route and the previous one have no static prefix
                    break;
                }

                if ($this->prefixes[$i] !== $this->staticPrefixes[$i] && $this->prefix === $this->staticPrefixes[$i]) {
                    // the previous route is non-static and has no static prefix
                    break;
                }

                if ($prefix !== $staticPrefix && $this->prefix === $staticPrefix) {
                    // the new route is non-static and has no static prefix
                    break;
                }

                continue;
            }

            if ($item instanceof self && $this->prefixes[$i] === $commonPrefix) {
                // the new route is a child of a previous one, let's nest it
                $item->addRoute($prefix, $route);
            } else {
                // the new route and a previous one have a common prefix, let's merge them
                $child = new self($commonPrefix);
                list($child->prefixes[0], $child->staticPrefixes[0]) = $child->getCommonPrefix($this->prefixes[$i], $this->prefixes[$i]);
                list($child->prefixes[1], $child->staticPrefixes[1]) = $child->getCommonPrefix($prefix, $prefix);
                $child->items = [$this->items[$i], $route];

                $this->staticPrefixes[$i] = $commonStaticPrefix;
                $this->prefixes[$i] = $commonPrefix;
                $this->items[$i] = $child;
            }

            return;
        }

        // No optimised case was found, in this case we simple add the route for possible
        // grouping when new routes are added.
        $this->staticPrefixes[] = $staticPrefix;
        $this->prefixes[] = $prefix;
        $this->items[] = $route;
    }