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Add Object#instance_exec and Proc#bind

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3469 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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sstephenson committed Jan 23, 2006
1 parent 9c24899 commit d921b799747aacb47dc8bbca9b2eefe25159e9d5
@@ -1,5 +1,9 @@
*SVN*

* Add Object#instance_exec, like instance_eval but passes its arguments to the block. (Active Support will not override the Ruby 1.9 implementation of this method.) [Sam Stephenson]

* Add Proc#bind(object) for changing a proc or block's self by returning a Method bound to the given object. Based on why the lucky stiff's "cloaker" method. [Sam Stephenson]

* Fix merge and dup for hashes with indifferent access #3404 [kenneth.miller@bitfield.net]

* Fix the requires in option_merger_test to unbreak AS tests. [Sam Stephenson]
@@ -65,6 +65,12 @@ def instance_values
def to_json
ActiveSupport::JSON.encode(self)
end

unless defined? instance_exec # 1.9
def instance_exec(*arguments, &block)
block.bind(self)[*arguments]
end
end
end

class Class #:nodoc:
@@ -0,0 +1,12 @@
class Proc #:nodoc:
def bind(object)
block, time = self, Time.now
(class << object; self end).class_eval do
method_name = "__bind_#{time.to_i}_#{time.usec}"
define_method(method_name, &block)
method = instance_method(method_name)
remove_method(method_name)
method
end.bind(object)
end
end
@@ -111,4 +111,10 @@ def test_instance_values
object.instance_variable_set :@b, 2
assert_equal({'a' => 1, 'b' => 2}, object.instance_values)
end

def test_instance_exec_passes_arguments_to_block
block = Proc.new { |value| [self, value] }
assert_equal %w(hello goodbye), 'hello'.instance_exec('goodbye', &block)
end

end
@@ -0,0 +1,12 @@
require 'test/unit'
require File.dirname(__FILE__) + '/../../lib/active_support/core_ext/proc'

class ProcTests < Test::Unit::TestCase
def test_bind_returns_method_with_changed_self
block = Proc.new { self }
assert_equal self, block.call
bound_block = block.bind("hello")
assert_not_equal block, bound_block
assert_equal "hello", bound_block.call
end
end

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