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require 'facets/more/functor'
module Namespace
#
def namespace(name, &block)
define_method(name) do
Functor.new do |op, *args|
send("#{name}:#{op}",*args)
end
end
begin
@namespace = name
module_eval &block
ensure
@namespace = nil
end
end
#
def method_added(name)
return if @method_being_added
if @namespace
@method_being_added = true
alias_method "#{@namespace}:#{name}", name
undef_method name
@method_being_added = false
end
end
end
class X
extend Namespace
def initialize(x)
@x = x
end
namespace :m do
def x ; @x; end
end
end
x = X.new(6)
p x.m.x
p x.x
exit
require 'facets/more/functor'
require 'facets/core/module/basename'
class Module
# Define a simple namespace.
#
# class A
# attr_writer :x
# namespace :inside do
# def x; @x; end
# end
# end
# a = A.new
# a.x = 10
# a.inside.x #=> 10
# a.x # no method error
def namespace( mod, &blk )
# If block is given then create a module, othewise
# get the name of the module.
if block_given?
name = mod.to_s
mod = Module.new(&blk)
else
name = mod.basename.downcase
mod = mod.dup
end
# We have to work around name clashes.
nameclashes = mod.instance_methods & instance_methods
nameclashes.each do |n|
alias_method "#{n}:namespace", n
end
# Include the module. This is neccessary, otherwise
# Ruby won't let us bind the instance methods.
include mod
# Undefine the instance methods of the module.
mod.instance_methods.each{ |m| undef_method m }
# Redefine the methods that clashed.
nameclashes.each do |n|
alias_method n, "#{n}:namespace"
undef_method "#{n}:namespace"
end
# Add a method for the namespace that delegates
# via the Functor to the module instance methods.
define_method(name) do
Functor.new(mod) do |op, base, *args|
base.instance_method(op).bind(self).call(*args)
end
end
end
end
=begin test
require 'test/unit'
class TestNamespace1 < Test::Unit::TestCase
module M
def x; "x"; end
end
class C
namespace M
end
def test_01
c = C.new
assert_equal('x', c.m.x)
end
def test_02
c = C.new
assert_raises(NoMethodError){ c.x }
end
end
class TestNamespace2 < Test::Unit::TestCase
class B
def x; 1; end
end
class C < B
def x; super; end
namespace :m do
def x; "x"; end
end
end
def test_01
c = C.new
assert_equal('x', c.m.x)
end
def test_02
c = C.new
assert_equal(1, c.x)
end
end
=end
|
