From a988b668d321f846555fa38bb4d9d0ebb95775dc Mon Sep 17 00:00:00 2001
From: Sam Harwell <sam@tunnelvisionlabs.com>
Date: Sat, 23 Feb 2013 23:12:51 -0600
Subject: [PATCH] Add RuleVersionAttribute

---
 .../Antlr4.Runtime/Antlr4.Runtime.csproj      |  1 +
 .../Antlr4.Runtime/RuleVersionAttribute.cs    | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 runtime/CSharp/Antlr4.Runtime/RuleVersionAttribute.cs

diff --git a/runtime/CSharp/Antlr4.Runtime/Antlr4.Runtime.csproj b/runtime/CSharp/Antlr4.Runtime/Antlr4.Runtime.csproj
index 4c7557413..c3d07473e 100644
--- a/runtime/CSharp/Antlr4.Runtime/Antlr4.Runtime.csproj
+++ b/runtime/CSharp/Antlr4.Runtime/Antlr4.Runtime.csproj
@@ -145,6 +145,7 @@
     <Compile Include="RecognitionException.cs" />
     <Compile Include="Recognizer`2.cs" />
     <Compile Include="RuleContext.cs" />
+    <Compile Include="RuleVersionAttribute.cs" />
     <Compile Include="Sharpen\Arrays.cs" />
     <Compile Include="Sharpen\AtomicReference`1.cs" />
     <Compile Include="Sharpen\BitSet.cs" />
diff --git a/runtime/CSharp/Antlr4.Runtime/RuleVersionAttribute.cs b/runtime/CSharp/Antlr4.Runtime/RuleVersionAttribute.cs
new file mode 100644
index 000000000..2fa8ed137
--- /dev/null
+++ b/runtime/CSharp/Antlr4.Runtime/RuleVersionAttribute.cs
@@ -0,0 +1,23 @@
+namespace Antlr4.Runtime
+{
+    using System;
+
+    [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = false)]
+    public sealed class RuleVersionAttribute : Attribute
+    {
+        private readonly int _version;
+
+        public RuleVersionAttribute(int version)
+        {
+            _version = version;
+        }
+
+        public int Version
+        {
+            get
+            {
+                return _version;
+            }
+        }
+    }
+}