Change Inflector#constantize to use eval instead of const_get

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3049 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/CHANGELOG

@@ -1,5 +1,7 @@
 *1.2.3* (November 7th, 2005)
 
+* Change Inflector#constantize to use eval instead of const_get. [Nicholas Seckar]
+
 * Fix const_missing handler to ignore the trailing '.rb' on files when comparing paths. [Nicholas Seckar]
 
 * Define kernel.rb methods in "class Object" instead of "module Kernel" to work around a Windows peculiarity [Sam Stephenson]

activesupport/lib/active_support/inflector.rb

@@ -142,9 +142,11 @@ module Inflector
   end
 
   def constantize(camel_cased_word)
-    camel_cased_word.split("::").inject(Object) do |final_type, part| 
-      final_type = final_type.const_get(part)
-    end
+    raise NameError, "#{camel_cased_word.inspect} is not a valid constant name!" unless
+      camel_cased_word.split("::").all? { |part| /^[A-Z]\w*$/ =~ part }
+    
+    camel_cased_word = "::#{camel_cased_word}" unless camel_cased_word[0, 2] == '::'
+    Object.module_eval(camel_cased_word, __FILE__, __LINE__)
   end
 
   def ordinalize(number)

activesupport/test/inflector_test.rb

@@ -276,6 +276,11 @@ class InflectorTest < Test::Unit::TestCase
     assert_equal Ace::Base::Case, Inflector.constantize("Ace::Base::Case")
     assert_equal InflectorTest, Inflector.constantize("InflectorTest")
     assert_raises(NameError) { Inflector.constantize("UnknownClass") }
+    assert_raises(NameError) { Inflector.constantize("An invalid string") }
+  end
+  
+  def test_constantize_doesnt_look_in_parent
+    assert_raises(NameError) { Inflector.constantize("Ace::Base::InflectorTest") }
   end
 
   def test_ordinal