* lib/ostruct.rb: Finish defining OpenStruct attributes lazily.

  Patch by @sferik in [GH-1037]: https://github.com/ruby/ruby/pull/1037
  This commit is an addendum to https://github.com/ruby/ruby/pull/1033.
  It:
  1. lazily defines attribute accessors for copied and marshaled objects,
  2. returns nil when an attribute reader is not defined, and
  3. defines respond_to_missing? to maintain the same respond_to? behavior

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52125 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 3 deletions

diff --git a/lib/ostruct.rb b/lib/ostruct.rb
index a48ae9af05..63146075be 100644
--- a/lib/ostruct.rb
+++ b/lib/ostruct.rb
@@ -98,7 +98,6 @@ class OpenStruct
   def initialize_copy(orig)
     super
     @table = @table.dup
-    @table.each_key{|key| new_ostruct_member(key)}
   end
 
   #
@@ -140,7 +139,6 @@ class OpenStruct
   #
   def marshal_load(x)
     @table = x
-    @table.each_key{|key| new_ostruct_member(key)}
   end
 
   #
@@ -172,6 +170,11 @@ class OpenStruct
   end
   protected :new_ostruct_member
 
+  def respond_to_missing?(mid, include_private = false)
+    mname = mid.to_s.chomp("=").to_sym
+    @table.key?(mname) || super
+  end
+
   def method_missing(mid, *args) # :nodoc:
     len = args.length
     if mname = mid[/.*(?==\z)/m]
@@ -180,7 +183,10 @@ class OpenStruct
       end
       modifiable[new_ostruct_member(mname)] = args[0]
     elsif len == 0
-      @table[mid]
+      if @table.key?(mid)
+        new_ostruct_member(mid)
+        @table[mid]
+      end
     else
       err = NoMethodError.new "undefined method `#{mid}' for #{self}", mid, args
       err.set_backtrace caller(1)