[clang] [clang-format] Add OneLineFormatOffRegex option (PR #137577)

[Björn Schäpers via cfe-commits]

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@@ -83,8 +83,42 @@ FormatTokenLexer::FormatTokenLexer(
 ArrayRef<FormatToken *> FormatTokenLexer::lex() {
   assert(Tokens.empty());
   assert(FirstInLineIndex == 0);
+  const llvm::Regex FormatOffRegex(Style.OneLineFormatOffRegex);
+  enum { FO_None, FO_CurrentLine, FO_NextLine } FormatOff = FO_None;
   do {
     Tokens.push_back(getNextToken());
+    auto &Tok = *Tokens.back();
+    const auto NewlinesBefore = Tok.NewlinesBefore;
+    switch (FormatOff) {
+    case FO_CurrentLine:
+      if (NewlinesBefore == 0)
+        Tok.Finalized = true;
+      else
+        FormatOff = FO_None;
+      break;
+    case FO_NextLine:
+      if (NewlinesBefore == 1) {
+        FormatOff = FO_CurrentLine;
+        Tok.Finalized = true;
+      } else {
+        FormatOff = FO_None;
+      }
+      break;
+    default:
+      if (!FormattingDisabled && FormatOffRegex.match(Tok.TokenText)) {
+        if (Tok.TokenText.starts_with("//") &&
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HazardyKnusperkeks wrote:

What about `/*`? I'm thinking of using it inside a macro definition.

https://github.com/llvm/llvm-project/pull/137577