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module RSpec
module Mocks
# @private
class TargetBase
def initialize(target)
@target = target
end
def self.delegate_to(matcher_method)
define_method(:to) do |matcher, &block|
unless matcher_allowed?(matcher)
raise_unsupported_matcher(:to, matcher)
end
define_matcher(matcher, matcher_method, &block)
end
end
def self.delegate_not_to(matcher_method, options={})
method_name = options.fetch(:from)
define_method(method_name) do |matcher, &block|
case matcher
when Matchers::Receive, Matchers::HaveReceived
define_matcher(matcher, matcher_method, &block)
when Matchers::ReceiveMessages, Matchers::ReceiveMessageChain
raise_negation_unsupported(method_name, matcher)
else
raise_unsupported_matcher(method_name, matcher)
end
end
end
def self.disallow_negation(method_name)
define_method(method_name) do |matcher, *_args|
raise_negation_unsupported(method_name, matcher)
end
end
private
def matcher_allowed?(matcher)
matcher.class.name.start_with?("RSpec::Mocks::Matchers".freeze)
end
def define_matcher(matcher, name, &block)
matcher.__send__(name, @target, &block)
end
def raise_unsupported_matcher(method_name, matcher)
raise UnsupportedMatcherError,
"only the `receive`, `have_received` and `receive_messages` matchers are supported " \
"with `#{expression}(...).#{method_name}`, but you have provided: #{matcher}"
end
def raise_negation_unsupported(method_name, matcher)
raise NegationUnsupportedError,
"`#{expression}(...).#{method_name} #{matcher.name}` is not supported since it " \
"doesn't really make sense. What would it even mean?"
end
def expression
self.class::EXPRESSION
end
end
# @private
class AllowanceTarget < TargetBase
EXPRESSION = :allow
delegate_to :setup_allowance
disallow_negation :not_to
disallow_negation :to_not
end
# @private
class ExpectationTarget < TargetBase
EXPRESSION = :expect
delegate_to :setup_expectation
delegate_not_to :setup_negative_expectation, :from => :not_to
delegate_not_to :setup_negative_expectation, :from => :to_not
end
# @private
class AnyInstanceAllowanceTarget < TargetBase
EXPRESSION = :allow_any_instance_of
delegate_to :setup_any_instance_allowance
disallow_negation :not_to
disallow_negation :to_not
end
# @private
class AnyInstanceExpectationTarget < TargetBase
EXPRESSION = :expect_any_instance_of
delegate_to :setup_any_instance_expectation
delegate_not_to :setup_any_instance_negative_expectation, :from => :not_to
delegate_not_to :setup_any_instance_negative_expectation, :from => :to_not
end
end
end
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