tree from dotted separated strings

tree.rb

#!/usr/bin/env ruby

a = {
    'uno.due.tre.otto' => 2,
    'uno.due.tre.sei' => 5,
    'uno.due.quattro' => 'ciao',
    'uno.sette.cinque' => 'true',
}

mib = {'uno' => {}}

a.each_pair do |item,val|
    cur = mib
    item.split(".").each_with_index do |part,index|
        if cur.has_key?(part)
            cur = cur[part]
        else
            if item.split(".").length - 1 == index
                cur[part] = val
            else
                cur[part] = {}
            end
            cur = cur[part]
        end
    end
end

p mib


puts mib['uno']['due']['tre']['otto']