[clang-format] Fixes for spaces around C# object initializers

Summary: Fix spaces around typename and [] in C# object initializers.

Reviewers: MyDeveloperDay, klimek, krasimir

Reviewed By: MyDeveloperDay, krasimir

Subscribers: cfe-commits

Tags: #clang-format, #clang

Differential Revision: https://reviews.llvm.org/D72401

clang/lib/Format/TokenAnnotator.cpp

@@ -2873,6 +2873,13 @@ bool TokenAnnotator::spaceRequiredBefore(const AnnotatedLine &Line,
       if (Left.is(tok::kw_using))
         return Style.SpaceBeforeParens == FormatStyle::SBPO_ControlStatements ||
                spaceRequiredBeforeParens(Right);
+    // space between ']' and '{'
+    if (Left.is(tok::r_square) && Right.is(tok::l_brace))
+      return true;
+    // space before '{' in "new MyType {"
+    if (Right.is(tok::l_brace) && Left.Previous &&
+        Left.Previous->is(tok::kw_new))
+      return true;
   } else if (Style.Language == FormatStyle::LK_JavaScript) {
     if (Left.is(TT_JsFatArrow))
       return true;

clang/unittests/Format/FormatTestCSharp.cpp

@@ -457,5 +457,34 @@ var x = foo(className, $@"some code:
   EXPECT_EQ(Code, format(Code, Style));
 }
 
+TEST_F(FormatTestCSharp, CSharpObjectInitializers) {
+  FormatStyle Style = getGoogleStyle(FormatStyle::LK_CSharp);
+
+  // Start code fragemnts with a comment line so that C++ raw string literals
+  // as seen are identical to expected formatted code.
+
+  verifyFormat(R"(//
+Shape[] shapes = new[] {
+    new Circle {
+        Radius = 2.7281,
+        Colour = Colours.Red,
+    },
+    new Square {
+        Side = 101.1,
+        Colour = Colours.Yellow,
+    },
+};)",
+               Style);
+
+  // Omitted final `,`s will change the formatting.
+  verifyFormat(R"(//
+Shape[] shapes = new[] {new Circle {Radius = 2.7281, Colour = Colours.Red},
+                        new Square {
+                            Side = 101.1,
+                            Colour = Colours.Yellow,
+                        }};)",
+               Style);
+}
+
 } // namespace format
 } // end namespace clang