module Spec
  module Expectations
    
    module MatcherHandlerHelper
      def describe(matcher)
        matcher.respond_to?(:description) ? matcher.description : "[#{matcher.class.name} does not provide a description]"
      end
    end
    
    class ExpectationMatcherHandler
      class << self
        include MatcherHandlerHelper
        def handle_matcher(actual, matcher, &block)
          unless matcher.nil?
            match = matcher.matches?(actual, &block)
            ::Spec::Matchers.generated_description = "should #{describe(matcher)}"
            Spec::Expectations.fail_with(matcher.failure_message) unless match
          end
        end
      end
    end

    class NegativeExpectationMatcherHandler
      class << self
        include MatcherHandlerHelper
        def handle_matcher(actual, matcher, &block)
          unless matcher.nil?
            unless matcher.respond_to?(:negative_failure_message)
              Spec::Expectations.fail_with(
  <<-EOF
  Matcher does not support should_not.
  See Spec::Matchers for more information
  about matchers.
  EOF
  )
            end
            match = matcher.matches?(actual, &block)
            ::Spec::Matchers.generated_description = "should not #{describe(matcher)}"
            Spec::Expectations.fail_with(matcher.negative_failure_message) if match
          end
        end
      end
    end

  end
end