crystal attempt at multidimensional array

nested_arr.cr

# start nested array if i==100
# end nested array if i==200
flat_tokens = [1, 2, 100, 3, 4, 200, 5, 100, 6, 7, 200, 8]

alias MYARR = Array(Array(Array(Int32) | Int32) | Array(Int32) | Int32)

def parse(tokens, list : MYARR)
  return {tokens, list} if tokens.empty?
  token = tokens.shift

  if token == 100
    puts "START nested"
    remaining_tokens, nested_list = parse(tokens, MYARR.new)

    puts "current list: #{list} #{list.class}"
    puts "nested list: #{nested_list} : #{nested_list.class}"

    puts "remaining tokens={#{remaining_tokens} : #{remaining_tokens.class}}"

    # list.push nested_list
    parse remaining_tokens, list
  elsif token == 200
    puts "END nested"
    return {tokens, list}
  else
    puts "token={#{token} : #{token.class}}"
    list.push token
  end

  parse tokens, list
end

puts "flat tokens={#{flat_tokens} : #{flat_tokens.class}}"
mytree = parse(flat_tokens, MYARR.new)
puts mytree