[clang] [libformat] Implement `TemplateTypeParameterKeyword` fixer (PR #192223)

[Björn Schäpers via cfe-commits]

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@@ -0,0 +1,180 @@
+//===--- TemplateTypeParameterKeywordFixer.cpp ------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file implements TemplateTypeParameterKeywordFixer, a TokenAnalyzer
+/// that rewrites \c typename and \c class when they introduce type template
+/// parameters or template template parameters, according to
+/// \c FormatStyle::TemplateTypeParameterKeyword.
+///
+//===----------------------------------------------------------------------===//
+
+#include "TemplateTypeParameterKeywordFixer.h"
+#include "FormatToken.h"
+#include "clang/Format/Format.h"
+#include "llvm/Support/Error.h"
+
+using llvm::cantFail;
+
+namespace clang {
+namespace format {
+namespace {
+
+bool angleIntroducesTemplateParameterList(const FormatToken *LT) {
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HazardyKnusperkeks wrote:

Please use more descriptive names.

https://github.com/llvm/llvm-project/pull/192223