Class: RLSM::RegExp::Union

Inherits:
Object show all
Defined in:
lib/rlsm_regexp.rb

Instance Method Summary collapse

Constructor Details

#initialize(parent, str) ⇒ Union

Returns a new instance of Union.



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# File 'lib/rlsm_regexp.rb', line 320

def initialize(parent, str)
  @parent = parent
  @childs = _split(str).map do |substr|
    NodeFactory.new_node(self, substr)
  end
end

Instance Method Details

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rlsm_regexp.rb', line 376

def empty?
  false
end

#first ⇒ Object 



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# File 'lib/rlsm_regexp.rb', line 331

def first
  res = []
  @childs.each do |child|
    child.first.each do |f|
      res << f
    end
  end

  res
end

#follow ⇒ Object 



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# File 'lib/rlsm_regexp.rb', line 353

def follow
  res = []
  @childs.each do |child|
    child.follow.each do |f|
      res << f
    end
  end

  res
end

#lambda? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rlsm_regexp.rb', line 372

def lambda?
  false
end

#last ⇒ Object 



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# File 'lib/rlsm_regexp.rb', line 342

def last
  res = []
  @childs.each do |child|
    child.last.each do |l|
      res << l
    end
  end

  res
end

#null? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rlsm_regexp.rb', line 327

def null?
  @childs.any? { |child| child.null? }
end

#to_s ⇒ Object 



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# File 'lib/rlsm_regexp.rb', line 364

def to_s
  if @parent.nil? or @parent.class == Union or @paarent.class == Star
    return @childs.map { |child| child.to_s }.join('|')
  else
    return '(' + @childs.map { |child| child.to_s }.join('|') + ')'
  end
end