Initial commit

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

CHANGELOG.rdoc

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+= Unextendable CHANGELOG
+
+== Version 0.1.0 (April 30, 2011)
+
+* Initial release

Gemfile

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+source "http://rubygems.org"
+
+gemspec

MIT-LICENSE

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+Copyright (c) 2011 Paul Engel
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.textile

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+h1. Unextendable
+
+A small gem making unextending extended modules within instances possible
+
+h2. Introduction
+
+A small gem making unextending extended modules within instances possible
+
+h2. Installation
+
+h3. Using Unextendable in Rails 3
+
+Add Unextendable in @Gemfile@ as a gem dependency:
+
+<pre>
+  gem "unextendable"
+</pre>
+
+Run the following in your console to install with Bundler:
+
+<pre>
+  bundle install
+</pre>
+
+h3. Using Unextendable in Rails 2
+
+Add Unextendable in @environment.rb@ as a gem dependency:
+
+<pre>
+  config.gem "unextendable"
+</pre>
+
+Run the following in your console:
+
+<pre>
+  sudo rake gems:install
+</pre>
+
+h2. Getting started
+
+Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+
+h2. Contact me
+
+For support, remarks and requests please mail me at "paul.engel@holder.nl":mailto:paul.engel@holder.nl.
+
+h2. License
+
+Copyright (c) 2011 Paul Engel, released under the MIT license
+
+"http://holder.nl":http://holder.nl – "http://codehero.es":http://codehero.es – "http://gettopup.com":http://gettopup.com – "http://twitter.com/archan937":http://twitter.com/archan937 – "paul.engel@holder.nl":mailto:paul.engel@holder.nl
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Rakefile

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+require "bundler"
+Bundler::GemHelper.install_tasks
+
+require "rake/testtask"
+Rake::TestTask.new(:test) do |test|
+  test.pattern = "test/**/*_test.rb"
+  test.verbose = true
+end
+
+task :default => :test

VERSION

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+0.1.0

lib/unextendable.rb

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+require File.expand_path("../unextendable/module" , __FILE__)
+require File.expand_path("../unextendable/object" , __FILE__)
+require File.expand_path("../unextendable/version", __FILE__)

lib/unextendable/module.rb

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+class Module
+
+  def unextendable
+    @unextendable = true
+  end
+
+  def unextendable?
+    !!@unextendable
+  end
+
+end

lib/unextendable/object.rb

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+class Object
+
+  def meta_class(&block)
+    class << self
+      yield if block_given?
+      self
+    end
+  end
+  alias :singleton_class :meta_class
+
+  meta_class do
+    def extended_modules
+      @extended_modules ||= []
+    end
+
+    def method_procs
+      @method_procs ||= {}
+    end
+  end
+
+  def extend(*modules)
+    modules.each do |mod|
+      wrap_unextendable_module mod if mod.unextendable?
+      add_extended_module mod
+      super(mod)
+    end
+  end
+
+  def unextend(*modules)
+    if modules.empty?
+      meta_class.extended_modules.delete_if{|mod| mod.unextendable?}
+    else
+      modules.each do |mod|
+        meta_class.extended_modules.delete mod
+      end
+    end
+  end
+
+private
+
+  def wrap_unextendable_module(mod)
+    return unless (mod.class == Module) && mod.unextendable?
+
+    mod.instance_methods.each do |method_name|
+      wrap_unextendable_method method_name
+    end
+  end
+
+  def wrap_unextendable_method(name)
+    return if meta_class.method_procs.key? name
+
+    meta_class.method_procs[name] = method(name).to_proc
+
+    instance_eval <<-CODE
+      def #{name}(*args, &block)
+        call_unextendable_method :#{name}, *args, &block
+      end
+    CODE
+  end
+
+  def add_extended_module(mod)
+    meta_class.extended_modules.delete  mod
+    meta_class.extended_modules.unshift mod
+  end
+
+  def call_unextendable_method(method_name, *args, &block)
+    method_for(method_name).call(*args, &block)
+  end
+
+  def method_for(method_name)
+    mod = meta_class.extended_modules.detect{|x| x.instance_methods.include? method_name.to_s}
+    mod ? mod.instance_method(method_name).bind(self) : proc_for(method_name)
+  end
+
+  def proc_for(method_name)
+    meta_class.method_procs[method_name.to_s] || method(method_name.to_s)
+  end
+
+end

lib/unextendable/version.rb

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+module Unextendable
+  VERSION = "0.1.0"
+end

script/console

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+#!/usr/bin/env ruby
+system "irb -r ./lib/unextendable.rb -r ./script/definitions.rb"

script/definitions.rb

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+module A
+  def name
+    "A"
+  end
+end
+
+module U
+  unextendable
+  def name
+    "U"
+  end
+end
+
+class C
+  attr_accessor :title
+  def salutation
+    [title, name].reject{|x| x.nil? || x.empty?}.join " "
+  end
+  def name
+    "C"
+  end
+end
+
+@c = C.new
+@c.title = "Mr."

test/module_test.rb

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+require File.expand_path("../test_helper", __FILE__)
+
+class ModuleTest < Test::Unit::TestCase
+
+  context "A module" do
+    setup do
+      module A
+      end
+    end
+
+    should "be able to be marked as unextendable" do
+      assert A.respond_to?(:unextendable)
+    end
+
+    should "respond to :unextendable?" do
+      assert A.respond_to?(:unextendable?)
+    end
+
+    context "which is not unextendable" do
+      should "return false when asked to be unextendable" do
+        assert !A.unextendable?
+      end
+    end
+
+    context "which is unextendable" do
+      setup do
+        module U
+          unextendable
+          def name
+            "U"
+          end
+        end
+      end
+
+      should "return true when asked to be unextendable" do
+        assert U.unextendable?
+      end
+    end
+  end
+
+end