The "genie" that generates MIU strings.

miu_system5.rb

# Given a list of MIU strings, this method generates more strings by taking
# each of the strings in the list and, if possible, applying each of the Rules
# 1, 2, 3, 4 to that string. The resulting collection of strings is then
# filtered for duplicates and returned. 
def generate_more_strings(miu_strings)
  # Helper method: applies all of the possible rules to a given string, and
  # returns an array of the results.
  def apply_all_rules(str)
    results = []
    results << apply_rule1(str) if can_apply_rule1?(str)
    results << apply_rule2(str) if can_apply_rule2?(str)

    if can_apply_rule3?(str)
      results << rule3_indices(str).map { |i| apply_rule3(str, i) }
    end

    if can_apply_rule4?(str)
      results << rule4_indices(str).map { |i| apply_rule4(str, i) }
    end

    results
  end

  miu_strings.map { |str| apply_all_rules(str) }.flatten.uniq
end