Class: Gullah::LoopCheck

Inherits:
Object
  • Object
show all
Defined in:
lib/gullah.rb

Instance Method Summary collapse

Constructor Details

#initialize(link) ⇒ LoopCheck

Returns a new instance of LoopCheck.



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# File 'lib/gullah.rb', line 586

def initialize(link)
  @seen = Set.new(link)
  @seeking = link.last
end

Instance Method Details

#add(link, grammar) ⇒ Object 



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# File 'lib/gullah.rb', line 591

def add(link, grammar)
  if @seeking == link.first
    if @seen.include? link.last
      grammar.instance_variable_set :@do_unary_branch_check, true
      throw :looped
    end
    LoopCheck.new(@seen.to_a + [link.last])
  end
end