Class: ActionDispatch::Journey::GTG::Simulator

Inherits:
Object
  • Object
show all
Defined in:
lib/action_dispatch/journey/gtg/simulator.rb

Overview

:nodoc:

Constant Summary collapse

INITIAL_STATE = 
[ [0, nil] ].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(transition_table) ⇒ Simulator

Returns a new instance of Simulator.



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# File 'lib/action_dispatch/journey/gtg/simulator.rb', line 21

def initialize(transition_table)
  @tt = transition_table
end

Instance Attribute Details

#tt ⇒ Object (readonly)

Returns the value of attribute tt.



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# File 'lib/action_dispatch/journey/gtg/simulator.rb', line 19

def tt
  @tt
end

Instance Method Details

#memos(string) ⇒ Object 



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# File 'lib/action_dispatch/journey/gtg/simulator.rb', line 25

def memos(string)
  input = StringScanner.new(string)
  state = INITIAL_STATE
  start_index = 0

  while sym = input.scan(%r([/.?]|[^/.?]+))
    end_index = start_index + sym.length

    state = tt.move(state, string, start_index, end_index)

    start_index = end_index
  end

  acceptance_states = state.each_with_object([]) do |s_d, memos|
    s, idx = s_d
    memos.concat(tt.memo(s)) if idx.nil? && tt.accepting?(s)
  end

  acceptance_states.empty? ? yield : acceptance_states
end