s = "{new {value1 value2 value3}} {old {value2 value1 value1}} {{old school} {value2 value3 value1}}"
os = []
level = 0
pos = 0
str = Struct.new(:key, :values)
value = ""
o = str.new("", [])
for i in 0...s.size
    x = s[i...i+1]
    case x
    when "{"
        level += 1
    when "}"
        if level == 2
            pos = 1
        end
        level -= 1
    when " "
        case level
        when 0
            o.values << value
            os << o.dup
            o = str.new("", [])
            value = ""
            pos = 0
        when 1
            if pos == 0
                pos = 1
            else
                value = ""
            end
        when 2
            if pos == 0
                o.key += x
            else
                o.values << value.dup
                value = ""
            end
        else
            raise
        end
    else
        if pos == 0
            o.key += x
        else
            value += x
        end
    end
end
o.values << value
os << o
puts os.inspect