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module RSpec
module Matchers
# Provides a base class with as little methods as possible, so that
# most methods can be delegated via `method_missing`.
#
# On Ruby 2.0+ BasicObject could be used for this purpose, but it
# introduce some extra complexity with constant resolution, so the
# BlankSlate pattern was prefered.
# @private
class BaseDelegator
kept_methods = [
# Methods that raise warnings if removed.
:__id__, :__send__, :object_id,
# Methods that are explicitly undefined in some subclasses.
:==, :===,
# Methods we keep on purpose.
:class, :respond_to?, :__method__, :method, :dup,
:clone, :initialize_dup, :initialize_copy, :initialize_clone,
]
instance_methods.each do |method|
unless kept_methods.include?(method.to_sym)
undef_method(method)
end
end
end
# Provides the necessary plumbing to wrap a matcher with a decorator.
# @private
class MatcherDelegator < BaseDelegator
include Composable
attr_reader :base_matcher
def initialize(base_matcher)
@base_matcher = base_matcher
end
def method_missing(*args, &block)
base_matcher.__send__(*args, &block)
end
if ::RUBY_VERSION.to_f > 1.8
def respond_to_missing?(name, include_all=false)
super || base_matcher.respond_to?(name, include_all)
end
else
# :nocov:
def respond_to?(name, include_all=false)
super || base_matcher.respond_to?(name, include_all)
end
# :nocov:
end
def initialize_copy(other)
@base_matcher = @base_matcher.clone
super
end
end
end
end
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