class Regexp::Expression::Conditional::Expression

def <<(exp)
  expressions.last << exp
end

def branch(exp = nil)
  raise TooManyBranches.new if branches.length == 2
  sequence = Branch.new(level, set_level, conditional_level + 1)
  expressions << sequence
  branches << expressions.last
end

def condition=(exp)
  @condition = exp
  expressions << exp
end

def initialize(token, options = {})
  super
  @branches  = []
end

def quantify(token, text, min = nil, max = nil, mode = :greedy)
  branches.last.last.quantify(token, text, min, max, mode)
end

def to_s(_format = :full)
  text + condition.text + branches.join('|') + ')'
end