Import lwIP contrib rep

... from http://git.savannah.gnu.org/cgit/lwip/lwip-contrib.git/ into contrib/ subdir, STABLE-2_1_0_RELEASE tag
lwIP contrib is now officially frozen
TODO: Fix build

contrib/apps/LwipMibCompiler/SharpSnmpLib/Mib/Elements/Imports.cs

@@ -0,0 +1,81 @@
+/*
+ * Created by SharpDevelop.
+ * User: lextm
+ * Date: 2008/5/31
+ * Time: 12:07
+ * 
+ * To change this template use Tools | Options | Coding | Edit Standard Headers.
+ */
+
+using System.Collections.Generic;
+
+namespace Lextm.SharpSnmpLib.Mib.Elements
+{
+    /// <summary>
+    /// The IMPORTS construct is used to specify items used in the current MIB module which are defined in another MIB module or ASN.1 module.
+    /// </summary>
+    public sealed class Imports : List<ImportsFrom>, IElement
+    {
+        private IModule _module;
+
+        /// <summary>
+        /// Creates an <see cref="Imports"/> instance.
+        /// </summary>
+        /// <param name="lexer"></param>
+        public Imports(IModule module, ISymbolEnumerator symbols)
+        {
+            _module = module;
+
+            Symbol current;
+            while ((current = symbols.NextSymbol()) != Symbol.Semicolon)
+            {
+                if (current == Symbol.EOL)
+                {
+                    continue;
+                }
+
+                ImportsFrom imports = new ImportsFrom(current, symbols);
+
+                this.Add(imports);
+            }
+        }
+
+        public IList<string> Dependents
+        {
+            get
+            {
+                List<string> result = new List<string>();
+
+                foreach (ImportsFrom import in this)
+                {
+                    result.Add(import.Module);
+                }
+
+                return result;
+            }
+        }
+
+        public ImportsFrom GetImportFromType(string type)
+        {
+            foreach (ImportsFrom import in this)
+            {
+                if (import.Types.Contains(type))
+                {
+                    return import;
+                }
+            }
+
+            return null;
+        }
+       
+        #region IElement Member
+
+        public IModule Module
+        {
+            get { return _module; }
+        }
+
+        #endregion
+
+    }
+}