Add support for expression bodies to IndexerDeclaration.

ICSharpCode.Decompiler/CSharp/OutputVisitor/CSharpOutputVisitor.cs

@@ -2096,15 +2096,24 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 			WriteKeyword(IndexerDeclaration.ThisKeywordRole);
 			Space(policy.SpaceBeforeMethodDeclarationParentheses);
 			WriteCommaSeparatedListInBrackets(indexerDeclaration.Parameters, policy.SpaceWithinMethodDeclarationParentheses);
-			OpenBrace(policy.PropertyBraceStyle);
-			// output get/set in their original order
-			foreach (AstNode node in indexerDeclaration.Children) {
-				if (node.Role == IndexerDeclaration.GetterRole || node.Role == IndexerDeclaration.SetterRole) {
-					node.AcceptVisitor(this);
+
+			if (indexerDeclaration.ExpressionBody.IsNull) {
+				OpenBrace(policy.PropertyBraceStyle);
+				// output get/set in their original order
+				foreach (AstNode node in indexerDeclaration.Children) {
+					if (node.Role == IndexerDeclaration.GetterRole || node.Role == IndexerDeclaration.SetterRole) {
+						node.AcceptVisitor(this);
+					}
 				}
+				CloseBrace(policy.PropertyBraceStyle);
+				NewLine();
+			} else {
+				Space();
+				WriteToken(Roles.Arrow);
+				Space();
+				indexerDeclaration.ExpressionBody.AcceptVisitor(this);
+				Semicolon();
 			}
-			CloseBrace(policy.PropertyBraceStyle);
-			NewLine();
 			EndNode(indexerDeclaration);
 		}
 		

ICSharpCode.Decompiler/CSharp/Syntax/TypeMembers/IndexerDeclaration.cs

@@ -35,6 +35,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		public static readonly TokenRole ThisKeywordRole = new TokenRole ("this");
 		public static readonly Role<Accessor> GetterRole = PropertyDeclaration.GetterRole;
 		public static readonly Role<Accessor> SetterRole = PropertyDeclaration.SetterRole;
+		public static readonly Role<Expression> ExpressionBodyRole = new Role<Expression>("ExpressionBody", Expression.Null);
 
 		public override SymbolKind SymbolKind {
 			get { return SymbolKind.Indexer; }
@@ -94,6 +95,11 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 			get { return GetChildByRole (Roles.RBrace); }
 		}
 
+		public Expression ExpressionBody {
+			get { return GetChildByRole(ExpressionBodyRole); }
+			set { SetChildByRole(ExpressionBodyRole, value); }
+		}
+
 		public override void AcceptVisitor (IAstVisitor visitor)
 		{
 			visitor.VisitIndexerDeclaration (this);
@@ -116,7 +122,8 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 				&& this.MatchAttributesAndModifiers(o, match) && this.ReturnType.DoMatch(o.ReturnType, match)
 				&& this.PrivateImplementationType.DoMatch(o.PrivateImplementationType, match)
 				&& this.Parameters.DoMatch(o.Parameters, match)
-				&& this.Getter.DoMatch(o.Getter, match) && this.Setter.DoMatch(o.Setter, match);
+				&& this.Getter.DoMatch(o.Getter, match) && this.Setter.DoMatch(o.Setter, match)
+				&& this.ExpressionBody.DoMatch(o.ExpressionBody, match);
 		}
 	}
 }