* lib/ostruct.rb (OpenStruct#new_ostruct_member): checks if frozen.

[ruby-talk:328195], [ruby-core:22142]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@22332 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Feb 15 21:43:44 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/ostruct.rb (OpenStruct#new_ostruct_member): checks if frozen.
+	  [ruby-talk:328195], [ruby-core:22142]
+
 Sun Feb 15 21:22:48 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/test/unit/assertions.rb (Test::Unit::Assertions): aliases

lib/ostruct.rb

@@ -67,29 +67,33 @@ class OpenStruct
     @table.each_key{|key| new_ostruct_member(key)}
   end
 
+  def modifiable
+    if self.frozen?
+      raise TypeError, "can't modify frozen #{self.class}", caller(2)
+    end
+    @table
+  end
+  protected :modifiable
+
   def new_ostruct_member(name)
     name = name.to_sym
     unless self.respond_to?(name)
       class << self; self; end.class_eval do
         define_method(name) { @table[name] }
-        define_method(:"#{name}=") { |x| @table[name] = x }
+        define_method("#{name}=") { |x| modifiable[name] = x }
       end
     end
+    name
   end
 
   def method_missing(mid, *args) # :nodoc:
     mname = mid.id2name
     len = args.length
-    if mname =~ /=$/
+    if mname.chomp!('=')
       if len != 1
         raise ArgumentError, "wrong number of arguments (#{len} for 1)", caller(1)
       end
-      if self.frozen?
+      modifiable[new_ostruct_member(mname)] = args[0]
-        raise TypeError, "can't modify frozen #{self.class}", caller(1)
-      end
-      mname.chop!
-      self.new_ostruct_member(mname)
-      @table[mname.intern] = args[0]
     elsif len == 0
       @table[mid]
     else

test/ostruct/test_ostruct.rb

@@ -34,4 +34,12 @@ class TC_OpenStruct < Test::Unit::TestCase
     foo.bar.foo = foo
     assert_equal('#<OpenStruct bar=#<OpenStruct foo=#<OpenStruct ...>>>', foo.inspect)
   end
+
+  def test_frozen
+    o = OpenStruct.new
+    o.a = 'a'
+    o.freeze
+    assert_raise(TypeError) {o.b = 'b'}
+    assert_not_respond_to(o, :b)
+  end
 end