module RSpec::Matchers::BuiltIn::BeHelpers

def args_to_s
  @args.empty? ? "" : parenthesize(inspected_args.join(', '))
end

def args_to_sentence
  to_sentence(@args)
end

def expected_to_sentence
  split_words(@expected)
end

def inspected_args
  @args.collect{|a| a.inspect}
end

def parenthesize(string)
  "(#{string})"
end