[clang-format] Improve BlockIndent at ColumnLimit

Fixes llvm#55731
Fixes llvm#73584

The reported formatting problems were related to ignoring deep nesting
of "simple" functions (causing llvm#54808) and to allowing the trailing
annotation to become separated from the closing parens, which allowed a
break to occur between the closing parens and the trailing annotation.
The fix for the nesting of "simple" functions is to detect them more
carefully. "Simple" was defined in a comment as being a single
non-expression argument. I tried to stay as close to the original intent
of the implementation while fixing the various bad formatting reports.

In the process of fixing these bugs, some latent bugs were discovered
related to how JavaScript Template Strings are handled. Those are also
fixed here.

Author: gedare

clang/lib/Format/ContinuationIndenter.cpp

@@ -803,6 +803,46 @@ void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
     return !Tok.Previous->isOneOf(TT_CastRParen, tok::kw_for, tok::kw_while,
                                   tok::kw_switch);
   };
+  // Detecting functions is brittle. It would be better if we could annotate
+  // the LParen type of functions/calls.
+  const auto IsFunctionDeclParen = [&](const FormatToken &Tok) {
+    return Tok.is(tok::l_paren) && Tok.Previous &&
+           (Tok.Previous->is(TT_FunctionDeclarationName) ||
+            (Tok.Previous->Previous &&
+             Tok.Previous->Previous->is(tok::coloncolon) &&
+             Tok.Previous->Previous->Previous &&
+             Tok.Previous->Previous->Previous->is(TT_FunctionDeclarationName)));
+  };
+  const auto IsFunctionCallParen = [&](const FormatToken &Tok) {
+    return Tok.is(tok::l_paren) && Tok.ParameterCount > 0 && Tok.Previous &&
+           Tok.Previous->is(tok::identifier);
+  };
+  const auto IsInTemplateString = [&](const FormatToken &Tok) {
+    if (!Style.isJavaScript())
+      return false;
+    for (const FormatToken *Prev = &Tok; Prev; Prev = Prev->Previous) {
+      if (Prev->is(TT_TemplateString) && Prev->opensScope())
+        return true;
+      if (Prev->is(TT_TemplateString) && Prev->closesScope())
+        break;
+    }
+    return false;
+  };
+  const auto IsNotSimpleFunction = [&](const FormatToken &Tok) {
+    const auto *Previous = Tok.Previous;
+    const auto *Next = Tok.Next;
+    if (Tok.FakeLParens.size() > 0 && Tok.FakeLParens.back() > prec::Unknown)
+      return true;
+    if (Previous &&
+        (IsFunctionDeclParen(*Previous) || IsFunctionCallParen(*Previous))) {
+      if (!IsOpeningBracket(Tok) && Next && !Next->isMemberAccess() &&
+          !IsInTemplateString(Tok) && !IsFunctionDeclParen(*Next) &&
+          !IsFunctionCallParen(*Next)) {
+        return true;
+      }
+    }
+    return false;
+  };
   if ((Style.AlignAfterOpenBracket == FormatStyle::BAS_AlwaysBreak ||
        Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent) &&
       IsOpeningBracket(Previous) && State.Column > getNewLineColumn(State) &&
@@ -813,10 +853,10 @@ void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
       //       caaaaaaaaaaaall(
       //           caaaaaaaaaaaall(
       //               caaaaaaaaaaaaaaaaaaaaaaall(aaaaaaaaaaaaaa, aaaaaaaaa))));
-      Current.FakeLParens.size() > 0 &&
-      Current.FakeLParens.back() > prec::Unknown) {
+      IsNotSimpleFunction(Current)) {
     CurrentState.NoLineBreak = true;
   }
+
   if (Previous.is(TT_TemplateString) && Previous.opensScope())
     CurrentState.NoLineBreak = true;
 
@@ -831,7 +871,8 @@ void ContinuationIndenter::addTokenOnCurrentLine(LineState &State, bool DryRun,
       Previous.isNot(TT_TableGenDAGArgOpenerToBreak) &&
       !(Current.MacroParent && Previous.MacroParent) &&
       (Current.isNot(TT_LineComment) ||
-       Previous.isOneOf(BK_BracedInit, TT_VerilogMultiLineListLParen))) {
+       Previous.isOneOf(BK_BracedInit, TT_VerilogMultiLineListLParen)) &&
+      !IsInTemplateString(Current)) {
     CurrentState.Indent = State.Column + Spaces;
     CurrentState.IsAligned = true;
   }

clang/lib/Format/TokenAnnotator.cpp

@@ -6157,6 +6157,12 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
     return !(Previous && (Previous->is(tok::kw_for) || Previous->isIf()));
   }
 
+  if (Left.isOneOf(tok::r_paren, TT_TrailingAnnotation) &&
+      Right.is(TT_TrailingAnnotation) &&
+      Style.AlignAfterOpenBracket == FormatStyle::BAS_BlockIndent) {
+    return false;
+  }
+
   // Allow breaking after a trailing annotation, e.g. after a method
   // declaration.
   if (Left.is(TT_TrailingAnnotation)) {

clang/unittests/Format/FormatTest.cpp

@@ -9305,6 +9305,28 @@ TEST_F(FormatTest, AlignsAfterOpenBracket) {
       "    aaaaaaaaaaaaaaaa\n"
       ");",
       Style);
+  verifyFormat(
+      "bool aaaaaaaaaaaaaaaaaaaaaaaaaaa(\n"
+      "    const bool &aaaaaaaaa, const void *aaaaaaaaaa\n"
+      ") const {\n"
+      "  return true;\n"
+      "}",
+      Style);
+  verifyFormat(
+      "bool aaaaaaaaaaaaaaaaaaaaaaaa(\n"
+      "    const bool &aaaaaaaaaa, const void *aaaaaaaaaa\n"
+      ") const;",
+      Style);
+  verifyFormat(
+      "void aaaaaaaaa(\n"
+      "    int aaaaaa, int bbbbbb, int cccccc, int dddddddddd\n"
+      ") const noexcept -> std::vector<of_very_long_type>;",
+      Style);
+  verifyFormat(
+      "aaaaaaaaaaaaaaaaaaa(\n"
+      "    \"a aaaaaaa aaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaa aaaaaaaaaaaaa\"\n"
+      ");",
+      Style);
 }
 
 TEST_F(FormatTest, ParenthesesAndOperandAlignment) {