Add Ruby 1.8.7 compatibility

.rspec

@@ -0,0 +1,2 @@
+--color
+--order random

.travis.yml

@@ -1,10 +1,20 @@
+before_install:
+  - gem update --system 2.1.11
+  - gem --version
 bundler_args: --without development
 language: ruby
 rvm:
+  - 1.8.7
+  - 1.9.2
+  - 1.9.3
   - 2.0.0
   - 2.1.0
+  - jruby
+  - jruby-head
+  - rbx
   - ruby-head
 matrix:
   allow_failures:
+    - rvm: jruby-head
     - rvm: ruby-head
   fast_finish: true

Changelog.md

@@ -3,4 +3,4 @@
 Features:
 
   - New "pebble" mode (Guilherme Carvalho)
-      
+

Gemfile

@@ -7,12 +7,21 @@ gem 'rake'
 
 group :development do
   gem 'guard'
-  gem 'guard-rspec'
   gem 'guard-bundler'
+  gem 'guard-rspec'
+  gem 'pry'
+  gem 'pry-rescue'
 end
 
 group :test do
-  gem "libnotify"
-  gem 'coveralls', require: false
+  gem 'coveralls', :require => false
+  gem 'libnotify'
+  gem 'mime-types', '~> 1.25', :platforms => [:jruby, :ruby_18]
   gem 'rspec', '~> 2.14'
 end
+
+platforms :rbx do
+  gem 'json'
+  gem 'rubinius-coverage', '~> 2.0'
+  gem 'rubysl', '~> 2.0'
+end

README.markdown

@@ -176,8 +176,8 @@ null_io = NullIO.new
 
 null_io << "foo"                # => nil
 null_io.readline                # => nil
-null_io.foobar                  # => 
-# ~> -:11:in `<main>': undefined method `foobar' for 
+null_io.foobar                  # =>
+# ~> -:11:in `<main>': undefined method `foobar' for
 #  <null:IO>:NullIO (NoMethodError)
 ```
 
@@ -268,8 +268,8 @@ null = NullObject.instance
 
 null.__id__                     # => 17844080
 NullObject.instance.__id__      # => 17844080
-NullObject.new                  # => 
-# ~> -:11:in `<main>': private method `new' called for 
+NullObject.new                  # =>
+# ~> -:11:in `<main>': private method `new' called for
 #  NullObject:Class (NoMethodError)
 ```
 
@@ -303,7 +303,7 @@ NullObject = Naught.build do |config|
   else
     config.singleton
   end
-end  
+end
 ```
 
 The only caveat is that when swapping between singleton and

lib/naught/basic_object.rb

@@ -0,0 +1,13 @@
+module Naught
+  if defined? ::BasicObject
+    class BasicObject < ::BasicObject
+    end
+  else
+    class BasicObject #:nodoc:
+      keep = %w[! != == __id__ __send__ equal? instance_eval instance_exec method_missing singleton_method_added singleton_method_removed singleton_method_undefined]
+      instance_methods.each do |method_name|
+        undef_method(method_name) unless keep.include?(method_name)
+      end
+    end
+  end
+end

lib/naught/conversions.rb

@@ -0,0 +1,57 @@
+module Naught
+  module Conversions
+
+    def self.included(null_class)
+      unless class_variable_defined?(:@@included) && @@included
+        @@null_class = null_class
+        @@null_equivs = null_class::NULL_EQUIVS
+        @@included = true
+      end
+      super
+    end
+
+    def Null(object=:nothing_passed)
+      case object
+      when NullObjectTag
+        object
+      when :nothing_passed, *@@null_equivs
+        @@null_class.get(:caller => caller(1))
+      else
+        raise ArgumentError, "#{object.inspect} is not null!"
+      end
+    end
+
+    def Maybe(object=nil)
+      object = yield if block_given?
+      case object
+      when NullObjectTag
+        object
+      when *@@null_equivs
+        @@null_class.get(:caller => caller(1))
+      else
+        object
+      end
+    end
+
+    def Just(object=nil)
+      object = yield if block_given?
+      case object
+      when NullObjectTag, *@@null_equivs
+        raise ArgumentError, "Null value: #{object.inspect}"
+      else
+        object
+      end
+    end
+
+    def Actual(object=nil)
+      object = yield if block_given?
+      case object
+      when NullObjectTag
+        nil
+      else
+        object
+      end
+    end
+
+  end
+end

lib/naught/null_class_builder.rb

@@ -1,4 +1,5 @@
-require 'naught/null_class_builder/conversions_module'
+require 'naught/basic_object'
+require 'naught/conversions'
 
 module Naught
   class NullClassBuilder
@@ -10,8 +11,8 @@ module Commands
 
     def initialize
       @interface_defined = false
-      @base_class        = BasicObject
-      @inspect_proc      = ->{ "<null>" }
+      @base_class        = Naught::BasicObject
+      @inspect_proc      = lambda { "<null>" }
       @stub_strategy     = :stub_method_returning_nil
       define_basic_methods
     end
@@ -33,10 +34,6 @@ def null_equivalents
       @null_equivalents ||= [nil]
     end
 
-    def generate_conversions_module(null_class)
-      ConversionsModule.new(null_class, null_equivalents)
-    end
-
     def generate_class
       respond_to_any_message unless interface_defined?
       generation_mod    = Module.new
@@ -48,7 +45,13 @@ def generate_class
       null_class = Class.new(@base_class) do
         const_set :GeneratedMethods, generation_mod
         const_set :Customizations, customization_mod
-        const_set :Conversions, builder.generate_conversions_module(self)
+        const_set :NULL_EQUIVS, builder.null_equivalents
+        include Conversions
+        remove_const :NULL_EQUIVS
+        Conversions.instance_methods.each do |instance_method|
+          undef_method(instance_method)
+        end
+        const_set :Conversions, Conversions
 
         include NullObjectTag
         include generation_mod
@@ -70,11 +73,20 @@ def method_missing(method_name, *args, &block)
       end
     end
 
-    def respond_to_missing?(method_name, include_private=false)
-      command_name = command_name_for_method(method_name)
-      Commands.const_defined?(command_name) || super
-    rescue NameError
-      super
+    if RUBY_VERSION >= '1.9'
+      def respond_to_missing?(method_name, include_private=false)
+        command_name = command_name_for_method(method_name)
+        Commands.const_defined?(command_name) || super
+      rescue NameError
+        super
+      end
+    else
+      def respond_to?(method_name, include_private=false)
+        command_name = command_name_for_method(method_name)
+        Commands.const_defined?(command_name) || super
+      rescue NameError
+        super
+      end
     end
 
     ############################################################################
@@ -88,7 +100,7 @@ def black_hole
     end
 
     def respond_to_any_message
-      defer(prepend: true) do |subject|
+      defer(:prepend => true) do |subject|
         subject.module_eval do
           def respond_to?(*)
             true
@@ -136,7 +148,7 @@ def initialize(*)
     end
 
     def define_basic_class_methods
-      defer(class: true) do |subject|
+      defer(:class => true) do |subject|
         subject.module_eval do
           class << self
             alias get new

lib/naught/null_class_builder/commands/mimic.rb

@@ -1,3 +1,4 @@
+require 'naught/basic_object'
 require 'naught/null_class_builder/command'
 
 module Naught::NullClassBuilder::Commands
@@ -11,7 +12,7 @@ def initialize(builder, class_to_mimic, options={})
       @include_super = options.fetch(:include_super) { true }
 
       builder.base_class   = root_class_of(class_to_mimic)
-      builder.inspect_proc = -> { "<null:#{class_to_mimic}>" }
+      builder.inspect_proc = lambda { "<null:#{class_to_mimic}>" }
       builder.interface_defined = true
     end
 
@@ -29,7 +30,7 @@ def root_class_of(klass)
       if klass.ancestors.include?(Object)
         Object
       else
-        BasicObject
+        Naught::BasicObject
       end
     end
 

lib/naught/null_class_builder/commands/singleton.rb

@@ -3,7 +3,7 @@
 module Naught::NullClassBuilder::Commands
   class Singleton < Naught::NullClassBuilder::Command
     def call
-      defer(class: true) do |subject|
+      defer(:class => true) do |subject|
         require 'singleton'
         subject.module_eval do
           include ::Singleton

lib/naught/null_class_builder/commands/traceable.rb

@@ -8,7 +8,11 @@ def call
           attr_reader :__file__, :__line__
 
           def initialize(options={})
-            backtrace = options.fetch(:caller) { Kernel.caller(4) }
+            backtrace = if RUBY_VERSION.to_f == 1.9 && RUBY_PLATFORM != 'java'
+              options.fetch(:caller) { Kernel.caller(4) }
+            else
+              options.fetch(:caller) { Kernel.caller(3) }
+            end
             @__file__, line, _ = backtrace[0].split(':')
             @__line__ = line.to_i
           end

spec/base_object_spec.rb

@@ -23,7 +23,7 @@
     Naught.build do |b|
       default_base_class = b.base_class
     end
-    expect(default_base_class).to eq(BasicObject)
+    expect(default_base_class).to eq(Naught::BasicObject)
   end
 
   describe 'singleton null object' do

spec/basic_null_object_spec.rb

@@ -32,4 +32,4 @@
     expect(null_class.get.class).to be(null_class)
   end
 
-end
+end

spec/blackhole_spec.rb

@@ -13,4 +13,4 @@
     expect(null.foobaz).to be(null)
     expect(null << "bar").to be(null)
   end
-end
+end

spec/conversions_spec.rb → spec/explicit_conversions_spec.rb

@@ -13,8 +13,12 @@
     expect(null.to_a).to eq([])
     expect(null.to_i).to eq(0)
     expect(null.to_f).to eq(0.0)
-    expect(null.to_c).to eq(Complex(0))
-    expect(null.to_r).to eq(Rational(0))
-    expect(null.to_h).to eq({})
+    if RUBY_VERSION >= '1.9'
+      expect(null.to_c).to eq(Complex(0))
+      expect(null.to_r).to eq(Rational(0))
+    end
+    if RUBY_VERSION >= '2.0'
+      expect(null.to_h).to eq({})
+    end
   end
-end
+end

spec/functions/actual_spec.rb

@@ -19,4 +19,4 @@
     expect(Actual{ConvertableNull.new}).to be_nil
     expect(Actual{"foo"}).to eq("foo")
   end
-end
+end