WhyFalsy

whyfalsy.rb

class WhyFalsy
	attr_reader :msg, :backtrace

	def initialize(msg=nil)
		@msg = msg

		# Hack to get a backtrace
		begin
			raise
		rescue Exception
			@backtrace = $!.backtrace
			@backtrace.shift # Remove the reference to initialize
		end
	end

	def self.wrap(x, msg=nil)
		# The !! makes fake-falsy values (like us) work
		!!x ? x : self.new(msg)
	end

	# This is so you can convert to bool with !!
	def !@
		true
	end

	def blank?
		true
	end

	def or
		yield
	end

	def and
		self
	end
end

class FalseClass
	def or
		yield
	end

	def and
		self
	end
end

class NilClass
	def or
		yield
	end

	def and
		self
	end
end

class Object
	def or
		self
	end

	def and
		yield
	end
end