clang-format: Fix C99 designated initializers corner cases

Summary:
This fixes the missing space before the designated initializer when `Cpp11BracedListStyle=false` :

  const struct A a = { .a = 1, .b = 2 };
                      ^

Also, wrapping between opening brace and designated array initializers used to have an excessive penalty (like breaking between an expression and the subscript operator), leading to unexpected wrapping:

  const struct Aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaa =
      {[1] = aaaaaaaaaaaaaaaaaaaaaaaaaaa,
       [2] = bbbbbbbbbbbbbbbbbbbbbbbbbbb};

instead of:

  const struct Aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaa = {
      [1] = aaaaaaaaaaaaaaaaaaaaaaaaaaa,
      [2] = bbbbbbbbbbbbbbbbbbbbbbbbbbb};

Finally, designated array initializers are not binpacked, just like designated member initializers.

Reviewers: djasper

Reviewed By: djasper

Subscribers: cfe-commits, krasimir, klimek

Differential Revision: https://reviews.llvm.org/D33491

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@305696 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/unittests/Format/FormatTest.cpp b/unittests/Format/FormatTest.cpp
index bae7fba0a6..51849d9650 100644
--- a/unittests/Format/FormatTest.cpp
+++ b/unittests/Format/FormatTest.cpp
@@ -1704,6 +1704,19 @@ TEST_F(FormatTest, DesignatedInitializers) {
                "    .eeeeeeeeeeeeeeeeeeeeeeeeeee = 5};");
 
   verifyGoogleFormat("const struct A a = {.a = 1, .b = 2};");
+
+  verifyFormat("const struct A a = {[0] = 1, [1] = 2};");
+  verifyFormat("const struct A a = {[1] = aaaaaaaaaa,\n"
+               "                    [2] = bbbbbbbbbb,\n"
+               "                    [3] = cccccccccc,\n"
+               "                    [4] = dddddddddd,\n"
+               "                    [5] = eeeeeeeeee};");
+  verifyFormat("const struct Aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaa = {\n"
+               "    [1] = aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
+               "    [2] = bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb,\n"
+               "    [3] = cccccccccccccccccccccccccccccccccccccc,\n"
+               "    [4] = dddddddddddddddddddddddddddddddddddddd,\n"
+               "    [5] = eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee};");
 }
 
 TEST_F(FormatTest, NestedStaticInitializers) {
@@ -6010,6 +6023,8 @@ TEST_F(FormatTest, LayoutCxx11BraceInitializers) {
                "  T member = {arg1, arg2};\n"
                "};");
   verifyFormat("vector<int> foo = {::SomeGlobalFunction()};");
+  verifyFormat("const struct A a = {.a = 1, .b = 2};");
+  verifyFormat("const struct A a = {[0] = 1, [1] = 2};");
   verifyFormat("static_assert(std::is_integral<int>{} + 0, \"\");");
   verifyFormat("int a = std::is_integral<int>{} + 0;");
 
@@ -6175,6 +6190,8 @@ TEST_F(FormatTest, LayoutCxx11BraceInitializers) {
                "    aaaaaaa,\n"
                "    a};");
   verifyFormat("vector<int> foo = { ::SomeGlobalFunction() };", ExtraSpaces);
+  verifyFormat("const struct A a = { .a = 1, .b = 2 };", ExtraSpaces);
+  verifyFormat("const struct A a = { [0] = 1, [1] = 2 };", ExtraSpaces);
 }
 
 TEST_F(FormatTest, FormatsBracedListsInColumnLayout) {