Class: Stamina::Abbadingo::RandomDFA

Inherits:
Object
  • Object
show all
Defined in:
lib/stamina-induction/stamina/abbadingo/random_dfa.rb

Overview

Generates a random DFA using the Abbadingo protocol.

Constant Summary collapse

DEFAULT_OPTIONS = 
{
  :minimize => :hopcroft
}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.execute(*args) ⇒ Object 



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# File 'lib/stamina-induction/stamina/abbadingo/random_dfa.rb', line 49

def self.execute(*args)
  new.execute(*args)
end

Instance Method Details

#execute(state_count = 64, accepting_ratio = 0.5, options = {}) ⇒ Object 



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# File 'lib/stamina-induction/stamina/abbadingo/random_dfa.rb', line 12

def execute(state_count = 64,
            accepting_ratio = 0.5,
            options = {})
  options = DEFAULT_OPTIONS.merge(options)

  # Built dfa
  dfa = Automaton.new

  # Generate 5/4*state_count states
  (state_count.to_f * 5.0 / 4.0).to_i.times do
    dfa.add_state(:initial   => false,
                  :accepting => (Kernel.rand <= accepting_ratio),
                  :error     => false)
  end

  # Generate all edges
  dfa.each_state do |source|
    ["0", "1"].each do |symbol|
      target = dfa.ith_state(Kernel.rand(dfa.state_count))
      dfa.connect(source, target, symbol)
    end
  end

  # Choose an initial state
  dfa.ith_state(Kernel.rand(dfa.state_count)).initial!

  # Minimize the automaton and return it
  case options[:minimize]
    when :hopcroft
      Stamina::Automaton::Minimize::Hopcroft.execute(dfa)
    when :pitchies
      Stamina::Automaton::Minimize::Pitchies.execute(dfa)
    else
      dfa
  end
end