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diff --git a/antlr-3.4/runtime/ObjC/Framework/ANTLRTokenSource.h b/antlr-3.4/runtime/ObjC/Framework/ANTLRTokenSource.h
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+++ b/antlr-3.4/runtime/ObjC/Framework/ANTLRTokenSource.h
@@ -0,0 +1,38 @@
+// [The "BSD licence"]
+// Copyright (c) 2006-2007 Kay Roepke 2010 Alan Condit
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+// 3. The name of the author may not be used to endorse or promote products
+//    derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#import "ANTLRToken.h"
+
+// Anything that responds to -nextToken can be treated as a lexer.
+// For instance this can be a flex lexer or a handwritten one or even
+// a proxy for a remotely running token source (database, lexer, whatever).
+@protocol ANTLRTokenSource <NSObject, NSCopying>
+
+- (id<ANTLRToken>) nextToken;
+- (NSString *)getSourceName;
+
+@end