Add Binding#implicit_parameters, etc.

This changeset introduces:

* `Binding#implicit_parameters`
* `Binding#implicit_parameter_get`
* `Binding#implicit_parameter_defined?`

[Bug #21049]

1 files changed, 54 insertions, 0 deletions

diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index 2eeb7a94eb..d6b2d80469 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -1691,6 +1691,60 @@ class TestProc < Test::Unit::TestCase
     end
   end
 
+  def test_implicit_parameters
+    x = x = 1
+    assert_raise(NameError) { binding.implicit_parameter_get(:x) }
+    assert_raise(NameError) { binding.implicit_parameter_defined?(:x) }
+
+    "foo".tap do
+      _5 and flunk
+      assert_equal([:_1, :_2, :_3, :_4, :_5], binding.implicit_parameters)
+      assert_equal("foo", binding.implicit_parameter_get(:_1))
+      assert_equal(nil, binding.implicit_parameter_get(:_5))
+      assert_raise(NameError) { binding.implicit_parameter_get(:_6) }
+      assert_equal(true, binding.implicit_parameter_defined?(:_1))
+      assert_equal(true, binding.implicit_parameter_defined?(:_5))
+      assert_equal(false, binding.implicit_parameter_defined?(:_6))
+      "bar".tap do
+        assert_equal([], binding.implicit_parameters)
+        assert_raise(NameError) { binding.implicit_parameter_get(:_1) }
+        assert_raise(NameError) { binding.implicit_parameter_get(:_6) }
+        assert_equal(false, binding.implicit_parameter_defined?(:_1))
+        assert_equal(false, binding.implicit_parameter_defined?(:_6))
+      end
+      assert_equal([:_1, :_2, :_3, :_4, :_5], binding.implicit_parameters)
+      assert_equal("foo", binding.implicit_parameter_get(:_1))
+      assert_equal(nil, binding.implicit_parameter_get(:_5))
+      assert_raise(NameError) { binding.implicit_parameter_get(:_6) }
+      assert_equal(true, binding.implicit_parameter_defined?(:_1))
+      assert_equal(true, binding.implicit_parameter_defined?(:_5))
+      assert_equal(false, binding.implicit_parameter_defined?(:_6))
+    end
+
+    "foo".tap do
+      assert_equal([], binding.implicit_parameters)
+      assert_raise(NameError) { binding.implicit_parameter_get(:_1) }
+      assert_raise(NameError) { binding.implicit_parameter_get(:_6) }
+      assert_equal(false, binding.implicit_parameter_defined?(:_1))
+      assert_equal(false, binding.implicit_parameter_defined?(:_6))
+      "bar".tap do
+        _5 and flunk
+        assert_equal([:_1, :_2, :_3, :_4, :_5], binding.implicit_parameters)
+        assert_equal("bar", binding.implicit_parameter_get(:_1))
+        assert_equal(nil, binding.implicit_parameter_get(:_5))
+        assert_raise(NameError) { binding.implicit_parameter_get(:_6) }
+        assert_equal(true, binding.implicit_parameter_defined?(:_1))
+        assert_equal(true, binding.implicit_parameter_defined?(:_5))
+        assert_equal(false, binding.implicit_parameter_defined?(:_6))
+      end
+      assert_equal([], binding.implicit_parameters)
+      assert_raise(NameError) { binding.implicit_parameter_get(:_1) }
+      assert_raise(NameError) { binding.implicit_parameter_get(:_6) }
+      assert_equal(false, binding.implicit_parameter_defined?(:_1))
+      assert_equal(false, binding.implicit_parameter_defined?(:_6))
+    end
+  end
+
   def test_it_is_not_local_variable
     "foo".tap do
       it