class RSpec::Mocks::Matchers::ReceiveMessages

def any_instance_of(subject)
  ::RSpec::Mocks.any_instance_recorder_for(subject)
end

def each_message_on(host)
  @message_return_value_hash.each do |message, value|
    yield host, message, value
  end
end

def initialize(message_return_value_hash)
  @message_return_value_hash = message_return_value_hash
  @backtrace_line = CallerFilter.first_non_rspec_line
end

def name
  "receive_messages"
end

def proxy_on(subject)
  ::RSpec::Mocks.proxy_for(subject)
end

def setup_allowance(subject)
  warn_about_block if block_given?
  each_message_on( proxy_on(subject) ) do |host, message, return_value|
    host.add_simple_stub(message, return_value)
  end
end

def setup_any_instance_allowance(subject)
  warn_about_block if block_given?
  any_instance_of(subject).stub(@message_return_value_hash)
end

def setup_any_instance_expectation(subject)
  warn_about_block if block_given?
  each_message_on( any_instance_of(subject) ) do |host, message, return_value|
    host.should_receive(message).and_return(return_value)
  end
end

def setup_expectation(subject)
  warn_about_block if block_given?
  each_message_on( proxy_on(subject) ) do |host, message, return_value|
    host.add_simple_expectation(message, return_value, @backtrace_line)
  end
end

def setup_negative_expectation(subject)
  raise NegationUnsupportedError,
    "`expect(...).to_not receive_messages` is not supported since it " +
    "doesn't really make sense. What would it even mean?"
end

def warn_about_block
  raise "Implementation blocks aren't supported with `receive_messages`"
end