Fixed SD2-752: Exception when classes use "global::" as base class reference

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/2.0@1275 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Project/Src/Parser/CSharp/Parser.cs

@@ -4629,7 +4629,7 @@ la.kind == Tokens.Identifier && Peek(1).kind == Tokens.DoubleColon) {
 			Expect(1);
 
 #line  2149 "cs.ATG" 
-			if (type.Type == "global") { type.IsGlobal = true; type.Type = t.val; } else type.Type += "." + t.val; 
+			if (type.Type == "global") { type.IsGlobal = true; type.Type = (t.val ?? "?"); } else type.Type += "." + (t.val ?? "?"); 
 		} else if (la.kind == 1) {
 			lexer.NextToken();
 

src/Libraries/NRefactory/Project/Src/Parser/CSharp/cs.ATG

@@ -2146,7 +2146,7 @@ PrimaryExpr<out Expression pexpr>
 		| IF (la.kind == Tokens.Identifier && Peek(1).kind == Tokens.DoubleColon)
 			ident (. type = new TypeReference(t.val); .)
 			"::"  (. pexpr = new TypeReferenceExpression(type); .)
-			ident (. if (type.Type == "global") { type.IsGlobal = true; type.Type = t.val; } else type.Type += "." + t.val; .)
+			ident (. if (type.Type == "global") { type.IsGlobal = true; type.Type = (t.val ?? "?"); } else type.Type += "." + (t.val ?? "?"); .)
 		/*--- simple name: */
 		| ident (. pexpr = new IdentifierExpression(t.val); .)
 		/*--- parenthesized expression: */

src/Libraries/NRefactory/Test/Parser/Expressions/TypeReferenceExpressionTests.cs

@@ -26,6 +26,22 @@ namespace ICSharpCode.NRefactory.Tests.AST
 	public class TypeReferenceExpressionTests
 	{
 		#region C#
+		[Test]
+		public void GlobalTypeReferenceExpression()
+		{
+			TypeReferenceExpression tr = ParseUtilCSharp.ParseExpression<TypeReferenceExpression>("global::System");
+			Assert.AreEqual("System", tr.TypeReference.Type);
+			Assert.IsTrue(tr.TypeReference.IsGlobal);
+		}
+		
+		[Test]
+		public void GlobalTypeReferenceExpressionWithoutTypeName()
+		{
+			TypeReferenceExpression tr = ParseUtilCSharp.ParseExpression<TypeReferenceExpression>("global::", true);
+			Assert.AreEqual("?", tr.TypeReference.Type);
+			Assert.IsTrue(tr.TypeReference.IsGlobal);
+		}
+		
 		[Test]
 		public void IntReferenceExpression()
 		{