[clang-format] do not break before { in JS comments

In JavaScript some @tags can be followed by `{`, and machinery that parses
these comments will fail to understand the comment if followed by a line break.

clang-format already handles this case by not breaking before `{` in comments.
However this was not working in cases when the column limit falls within `@tag`
or between `@tag` and `{`. This adapts clang-format for this case.

Reviewed By: mprobst

Differential Revision: https://reviews.llvm.org/D90908

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index da26a9b..d140fe5 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -2184,6 +2184,16 @@ TEST_F(FormatTestJS, JSDocAnnotations) {
                " * @lala {lala {lalala\n"
                " */\n",
                getGoogleJSStyleWithColumns(20));
+  // cases where '{' is around the column limit
+  for (int ColumnLimit = 6; ColumnLimit < 13; ++ColumnLimit) {
+    verifyFormat("/**\n"
+                 " * @param {type}\n"
+                 " */",
+                 "/**\n"
+                 " * @param {type}\n"
+                 " */",
+                 getGoogleJSStyleWithColumns(ColumnLimit));
+  }
   verifyFormat("/**\n"
                " * @see http://very/very/long/url/is/long\n"
                " */",