[PATCH] D79320: [clang-format [PR45791] BeforeLambdaBody is confused by comment inside lambda

[MyDeveloperDay via Phabricator via cfe-commits]

MyDeveloperDay created this revision.
MyDeveloperDay added reviewers: krasimir, sammccall, Wawha, duncan-llvm.
MyDeveloperDay added projects: clang, clang-format.

https://bugs.llvm.org/show_bug.cgi?id=45791

Lambda with line comment is incorrectly formatted

  auto k = []() // comment
  { return; };
  `



  auto k = []() // comment { return; };


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D79320

Files:
  clang/lib/Format/ContinuationIndenter.cpp
  clang/unittests/Format/FormatTest.cpp


Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -14576,6 +14576,30 @@
                LLVMWithBeforeLambdaBody);
 }
 
+TEST_F(FormatTest, LambdaWithLineComments) {
+  FormatStyle LLVMWithBeforeLambdaBody = getLLVMStyle();
+  LLVMWithBeforeLambdaBody.BreakBeforeBraces = FormatStyle::BS_Custom;
+  LLVMWithBeforeLambdaBody.BraceWrapping.BeforeLambdaBody = true;
+  LLVMWithBeforeLambdaBody.AllowShortLambdasOnASingleLine =
+      FormatStyle::ShortLambdaStyle::SLS_All;
+
+  verifyFormat("auto k = []() { return; }", LLVMWithBeforeLambdaBody);
+  verifyFormat("auto k = []() // comment\n"
+               "{ return; }",
+               LLVMWithBeforeLambdaBody);
+  verifyFormat("auto k = []() /* comment */ { return; }",
+               LLVMWithBeforeLambdaBody);
+  verifyFormat("auto k = []() /* comment */ /* comment */ { return; }",
+               LLVMWithBeforeLambdaBody);
+  verifyFormat("auto k = []() // X\n"
+               "{ return; }",
+               LLVMWithBeforeLambdaBody);
+  verifyFormat(
+      "auto k = []() // XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
+      "{ return; }",
+      LLVMWithBeforeLambdaBody);
+}
+
 TEST_F(FormatTest, EmptyLinesInLambdas) {
   verifyFormat("auto lambda = []() {\n"
                "  x(); //\n"
Index: clang/lib/Format/ContinuationIndenter.cpp
===================================================================
--- clang/lib/Format/ContinuationIndenter.cpp
+++ clang/lib/Format/ContinuationIndenter.cpp
@@ -330,7 +330,7 @@
   const FormatToken &Current = *State.NextToken;
   const FormatToken &Previous = *Current.Previous;
   if (Style.BraceWrapping.BeforeLambdaBody && Current.CanBreakBefore &&
-      Current.is(TT_LambdaLBrace)) {
+      Current.is(TT_LambdaLBrace) && Previous.isNot(TT_LineComment)) {
     auto LambdaBodyLength = getLengthToMatchingParen(Current, State.Stack);
     return (LambdaBodyLength > getColumnLimit(State));
   }


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