Class: ActionDispatch::Journey::NFA::Simulator

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

Overview

:nodoc:

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/nfa/simulator.rb', line 19

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/nfa/simulator.rb', line 17

def tt
  @tt
end

Instance Method Details

#simulate(string) ⇒ Object Also known as: =~, match 



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# File 'lib/action_dispatch/journey/nfa/simulator.rb', line 23

def simulate(string)
  input = StringScanner.new(string)
  state = tt.eclosure(0)
  until input.eos?
    sym   = input.scan(%r([/.?]|[^/.?]+))

    # FIXME: tt.eclosure is not needed for the GTG
    state = tt.eclosure(tt.move(state, sym))
  end

  acceptance_states = state.find_all { |s|
    tt.accepting?(tt.eclosure(s).sort.last)
  }

  return if acceptance_states.empty?

  memos = acceptance_states.flat_map { |x| tt.memo(x) }.compact

  MatchData.new(memos)
end