[clang] [clang-format][NFC] Refactor UnwrappedLineParser::parseLabel (PR #207674)

[via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/207674

See https://github.com/llvm/llvm-project/pull/196815#issuecomment-4470006692

>From 183586940251a89cf568126883a1cdf89f444c7e Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Mon, 6 Jul 2026 00:33:07 -0700
Subject: [PATCH] [clang-format][NFC] Refactor UnwrappedLineParser::parseLabel

See https://github.com/llvm/llvm-project/pull/196815#issuecomment-4470006692
---
 clang/lib/Format/UnwrappedLineParser.cpp | 36 +++++++++++-------------
 clang/lib/Format/UnwrappedLineParser.h   |  3 +-
 2 files changed, 18 insertions(+), 21 deletions(-)

diff --git a/clang/lib/Format/UnwrappedLineParser.cpp b/clang/lib/Format/UnwrappedLineParser.cpp
index 0a211f5325e6f..c9913e0627a21 100644
--- a/clang/lib/Format/UnwrappedLineParser.cpp
+++ b/clang/lib/Format/UnwrappedLineParser.cpp
@@ -1773,7 +1773,7 @@ void UnwrappedLineParser::parseStructuralElement(
       if (!Line->InMacroBody || CurrentLines->size() > 1)
         Line->Tokens.begin()->Tok->MustBreakBefore = true;
       FormatTok->setFinalizedType(TT_GotoLabelColon);
-      parseLabel(Style.IndentGotoLabels);
+      parseLabel(/*IsGotoLabel=*/true);
       if (HasLabel)
         *HasLabel = true;
       return;
@@ -3431,28 +3431,24 @@ void UnwrappedLineParser::parseDoWhile() {
   parseStructuralElement();
 }
 
-void UnwrappedLineParser::parseLabel(
-    FormatStyle::IndentGotoLabelStyle IndentGotoLabels) {
-  const bool IsGotoLabel = FormatTok->is(TT_GotoLabelColon);
+void UnwrappedLineParser::parseLabel(bool IsGotoLabel) {
   nextToken();
-  unsigned OldLineLevel = Line->Level;
 
-  switch (IndentGotoLabels) {
-  case FormatStyle::IGLS_NoIndent:
-    Line->Level = 0;
-    break;
-  case FormatStyle::IGLS_OuterIndent:
-    if (Line->Level > 1 || (!Line->InPPDirective && Line->Level > 0))
-      --Line->Level;
-    break;
-  case FormatStyle::IGLS_HalfIndent:
-  case FormatStyle::IGLS_InnerIndent:
-    break;
+  const auto IndentGotoLabel = Style.IndentGotoLabels;
+  const auto OldLineLevel = Line->Level;
+  auto &Level = Line->Level;
+
+  if (IsGotoLabel && IndentGotoLabel == FormatStyle::IGLS_NoIndent)
+    Level = 0;
+
+  if (!IsGotoLabel || IndentGotoLabel == FormatStyle::IGLS_OuterIndent) {
+    if (OldLineLevel > 1 || (!Line->InPPDirective && OldLineLevel > 0))
+      --Level;
   }
 
   if (!IsGotoLabel && !Style.IndentCaseBlocks &&
       CommentsBeforeNextToken.empty() && FormatTok->is(tok::l_brace)) {
-    CompoundStatementIndenter Indenter(this, Line->Level,
+    CompoundStatementIndenter Indenter(this, Level,
                                        Style.BraceWrapping.AfterCaseLabel,
                                        Style.BraceWrapping.IndentBraces);
     parseBlock();
@@ -3462,7 +3458,7 @@ void UnwrappedLineParser::parseLabel(
         addUnwrappedLine();
         if (!Style.IndentCaseBlocks &&
             Style.BreakBeforeBraces == FormatStyle::BS_Whitesmiths) {
-          ++Line->Level;
+          ++Level;
         }
       }
       parseStructuralElement();
@@ -3473,7 +3469,9 @@ void UnwrappedLineParser::parseLabel(
       nextToken();
     addUnwrappedLine();
   }
-  Line->Level = OldLineLevel;
+
+  Level = OldLineLevel;
+
   if (FormatTok->isNot(tok::l_brace)) {
     parseStructuralElement();
     addUnwrappedLine();
diff --git a/clang/lib/Format/UnwrappedLineParser.h b/clang/lib/Format/UnwrappedLineParser.h
index 22803a837cc63..8fa4e9f7540d5 100644
--- a/clang/lib/Format/UnwrappedLineParser.h
+++ b/clang/lib/Format/UnwrappedLineParser.h
@@ -162,8 +162,7 @@ class UnwrappedLineParser {
   void parseLoopBody(bool KeepBraces, bool WrapRightBrace);
   void parseForOrWhileLoop(bool HasParens = true);
   void parseDoWhile();
-  void parseLabel(FormatStyle::IndentGotoLabelStyle IndentGotoLabels =
-                      FormatStyle::IGLS_OuterIndent);
+  void parseLabel(bool IsGotoLabel = false);
   void parseCaseLabel();
   void parseSwitch(bool IsExpr);
   void parseNamespace();