clang-tidy/modernize/UseStdNumbersCheck.h

//===--- UseStdNumbersCheck.h - clang-tidy ----------------------*- 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USESTDNUMBERSCHECK_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USESTDNUMBERSCHECK_H

#include "../ClangTidyCheck.h"
#include "../utils/IncludeInserter.h"

namespace clang::tidy::modernize {

/// Finds constants and function calls to math functions that can be replaced
/// with c++20's mathematical constants from the ``numbers`` header and
/// offers fix-it hints.
/// Does not match the use of variables with that value, and instead,
/// offers a replacement at the definition of those variables.
///
/// For the user-facing documentation see:
/// http://clang.llvm.org/extra/clang-tidy/checks/modernize/use-std-numbers.html
class UseStdNumbersCheck : public ClangTidyCheck {
public:
  UseStdNumbersCheck(StringRef Name, ClangTidyContext *Context);

  bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
    return LangOpts.CPlusPlus20;
  }
  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
  void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
                           Preprocessor *ModuleExpanderPP) override;
  void storeOptions(ClangTidyOptions::OptionMap &Opts) override;
  std::optional<TraversalKind> getCheckTraversalKind() const override {
    return TK_IgnoreUnlessSpelledInSource;
  }

private:
  utils::IncludeInserter IncludeInserter;
  StringRef DiffThresholdString;
  double DiffThreshold;
};

} // namespace clang::tidy::modernize

#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MODERNIZE_USESTDNUMBERSCHECK_H