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# frozen_string_literal: true
module Contracts
module MethodDecorators
def self.extended(klass)
Engine.apply(klass)
end
def inherited(subclass)
Engine.fetch_from(subclass).set_eigenclass_owner
super
end
def method_added(name)
MethodHandler.new(name, false, self).handle
super
end
def singleton_method_added(name)
MethodHandler.new(name, true, self).handle
super
end
end
class Decorator
# an attr_accessor for a class variable:
class << self; attr_accessor :decorators; end
def self.inherited(klass)
super
name = klass.name.gsub(/^./) { |m| m.downcase }
return if name =~ /^[^A-Za-z_]/ || name =~ /[^0-9A-Za-z_]/
# the file and line parameters set the text for error messages
# make a new method that is the name of your decorator.
# that method accepts random args and a block.
# inside, `decorate` is called with those params.
MethodDecorators.module_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
def #{klass}(*args, &blk)
::Contracts::Engine.fetch_from(self).decorate(#{klass}, *args, &blk)
end
RUBY_EVAL
end
def initialize(klass, method)
@method = method
end
end
end
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