class RSpec::Matchers::BuiltIn::OperatorMatcher

def self.use_custom_matcher_or_delegate(operator)
  define_method(operator) do |expected|
    if !has_non_generic_implementation_of?(operator) && (matcher = OperatorMatcher.get(@actual.class, operator))
      @actual.__send__(::RSpec::Matchers.last_expectation_handler.should_method, matcher.new(expected))
    else
      eval_match(@actual, operator, expected)
    end
  end
  negative_operator = operator.sub(/^=/, '!')
  if negative_operator != operator && respond_to?(negative_operator)
    define_method(negative_operator) do |_expected|
      opposite_should = ::RSpec::Matchers.last_expectation_handler.opposite_should_method
      raise "RSpec does not support `#{::RSpec::Matchers.last_expectation_handler.should_method} #{negative_operator} expected`.  " \
        "Use `#{opposite_should} #{operator} expected` instead."
    end
  end
end

def description
  "#{@operator} #{RSpec::Support::ObjectFormatter.format(@expected)}"
end

def eval_match(actual, operator, expected)
  ::RSpec::Matchers.last_matcher = self
  @operator, @expected = operator, expected
  __delegate_operator(actual, operator, expected)
end

def fail_with_message(message)
  RSpec::Expectations.fail_with(message, @expected, @actual)
end

def get(klass, operator)
  klass.ancestors.each do |ancestor|
    matcher = registry[ancestor] && registry[ancestor][operator]
    return matcher if matcher
  end
  nil
end

def has_non_generic_implementation_of?(op)
  Support.method_handle_for(@actual, op).owner != ::Kernel
rescue NameError
  false
end

def initialize(actual)
  @actual = actual
end

def register(klass, operator, matcher)
  registry[klass] ||= {}
  registry[klass][operator] = matcher
end

def registry
  @registry ||= {}
end

def unregister(klass, operator)
  registry[klass] && registry[klass].delete(operator)
end