Provide pattern matching for OpenStruct

lib/ostruct.rb

@@ -428,6 +428,35 @@ def hash # :nodoc:
     @table.hash
   end
 
+  #
+  # Returns a hash of attributes for the given keys. Provides the pattern
+  # matching interface for matching against hash patterns. For example:
+  #
+  #   require "ostruct"
+  #
+  #   def greeting_for(person)
+  #     case person
+  #     in { name: "Mary" }
+  #       "Welcome back, Mary!"
+  #     in { name: }
+  #       "Welcome stranger!"
+  #     end
+  #   end
+  #
+  #   person = OpenStruct.new(name: "Mary")
+  #   greeting_for(person) # => "Welcome back, Mary!"
+  #
+  #   person = OpenStruct.new
+  #   greeting_for(person) # => "Welcome stranger!"
+  #
+  def deconstruct_keys(keys)
+    deconstructed = {}
+    keys.each do |key|
+      deconstructed[key] = public_send(key)
+    end
+    deconstructed
+  end
+
   #
   # Provides marshalling support for use by the YAML library.
   #

test/ostruct/test_ostruct.rb

@@ -412,4 +412,16 @@ def test_class
     assert_equal('my-class', os.class)
     assert_equal(OpenStruct, os.class!)
   end
+
+  def test_pattern_matching
+    os = OpenStruct.new(class: 'my-class', method: 'post')
+    instance_eval(<<~RUBY)
+      case os
+      in { class: 'my-class', method: 'post' }
+        assert true
+      else
+        assert false
+      end
+    RUBY
+  end if RUBY_VERSION >= '2.7'
 end