[clang] [clang-format][NFC] Use the newly added AllowLiteralDigitSeparator (PR #185165)

[via cfe-commits]

https://github.com/owenca created https://github.com/llvm/llvm-project/pull/185165

Use LangOptions::AllowLiteralDigitSeparator added in #184235 for the IntegerLiteralSeparator option.

>From 64f7a9ef1f67f9196732c4c9dd9bbc8878013d16 Mon Sep 17 00:00:00 2001
From: Owen Pan <owenpiano at gmail.com>
Date: Sat, 7 Mar 2026 00:49:23 -0800
Subject: [PATCH] [clang-format][NFC] Use the newly added
 AllowLiteralDigitSeparator

Use LangOptions::AllowLiteralDigitSeparator added in #184235 for the
IntegerLiteralSeparator option.
---
 clang/lib/Format/IntegerLiteralSeparatorFixer.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/clang/lib/Format/IntegerLiteralSeparatorFixer.cpp b/clang/lib/Format/IntegerLiteralSeparatorFixer.cpp
index 5f40100c2b968..eea9fcc56af63 100644
--- a/clang/lib/Format/IntegerLiteralSeparatorFixer.cpp
+++ b/clang/lib/Format/IntegerLiteralSeparatorFixer.cpp
@@ -44,6 +44,8 @@ static Base getBase(StringRef IntegerLiteral) {
 std::pair<tooling::Replacements, unsigned>
 IntegerLiteralSeparatorFixer::process(const Environment &Env,
                                       const FormatStyle &Style) {
+  const auto LangOpts = getFormattingLangOpts(Style);
+
   switch (Style.Language) {
   case FormatStyle::LK_CSharp:
   case FormatStyle::LK_Java:
@@ -53,11 +55,10 @@ IntegerLiteralSeparatorFixer::process(const Environment &Env,
   case FormatStyle::LK_C:
   case FormatStyle::LK_Cpp:
   case FormatStyle::LK_ObjC:
-    if (Style.Standard >= FormatStyle::LS_Cpp14) {
-      Separator = '\'';
-      break;
-    }
-    [[fallthrough]];
+    if (!LangOpts.AllowLiteralDigitSeparator)
+      return {};
+    Separator = '\'';
+    break;
   default:
     return {};
   }
@@ -94,7 +95,6 @@ IntegerLiteralSeparatorFixer::process(const Environment &Env,
   AffectedRangeManager AffectedRangeMgr(SourceMgr, Env.getCharRanges());
 
   const auto ID = Env.getFileID();
-  const auto LangOpts = getFormattingLangOpts(Style);
   Lexer Lex(ID, SourceMgr.getBufferOrFake(ID), SourceMgr, LangOpts);
   Lex.SetCommentRetentionState(true);