1 files changed, 40 insertions, 0 deletions
diff --git a/lib/chef/node_filter.rb b/lib/chef/node_filter.rb
new file mode 100644
index 0000000000..7df59b572b
--- /dev/null
+++ b/lib/chef/node_filter.rb
@@ -0,0 +1,40 @@
+class Chef
+  class NodeMapValue
+    def initialize(&filter)
+    end
+
+    def <=>(other)
+      priority <=> other.priority
+    end
+    def priority
+      Float::INFINITY
+    end
+    def value
+      filter.call(run_context)
+    end
+  end
+
+  class FilteredValue
+    def initialize(name, os: nil, platform: nil, platform_family: nil, &filter)
+      @name = name
+      @os = os
+      @platform = platform
+      @platform_family = platform_family
+      super(&filter)
+    end
+
+    def <=>(other)
+      if other.is_a?(FilteredValue)
+        if platform_family != other.platform_family
+          return platform_family ? -1 : 1
+        end
+        if platform != other.platform
+          return platform ? -1 : 1
+        end
+        if os != other.os
+          return os ? -1 : 1
+        end
+      end
+    end
+  end
+end