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//===---------- IncludeInserter.h - clang-tidy ----------------------------===//
//
// 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_INCLUDEINSERTER_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_INCLUDEINSERTER_H
#include "IncludeSorter.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Lex/PPCallbacks.h"
#include <memory>
#include <string>
namespace clang {
namespace tidy {
namespace utils {
/// Produces fixes to insert specified includes to source files, if not
/// yet present.
///
/// ``IncludeInserter`` can be used in clang-tidy checks in the following way:
/// \code
/// #include "../utils/IncludeInserter.h"
/// #include "clang/Frontend/CompilerInstance.h"
///
/// class MyCheck : public ClangTidyCheck {
/// public:
/// void registerPPCallbacks(const SourceManager &SM, Preprocessor *PP,
/// Preprocessor *ModuleExpanderPP) override {
/// Inserter = std::make_unique<IncludeInserter>(
/// SM, getLangOpts(), utils::IncludeSorter::IS_Google);
/// PP->addPPCallbacks(Inserter->CreatePPCallbacks());
/// }
///
/// void registerMatchers(ast_matchers::MatchFinder* Finder) override { ... }
///
/// void check(
/// const ast_matchers::MatchFinder::MatchResult& Result) override {
/// ...
/// Inserter->CreateIncludeInsertion(
/// Result.SourceManager->getMainFileID(), "path/to/Header.h",
/// /*IsAngled=*/false);
/// ...
/// }
///
/// private:
/// std::unique_ptr<clang::tidy::utils::IncludeInserter> Inserter;
/// };
/// \endcode
class IncludeInserter {
public:
IncludeInserter(const SourceManager &SourceMgr, const LangOptions &LangOpts,
IncludeSorter::IncludeStyle Style);
~IncludeInserter();
/// Create ``PPCallbacks`` for registration with the compiler's preprocessor.
std::unique_ptr<PPCallbacks> CreatePPCallbacks();
/// Creates a \p Header inclusion directive fixit. Returns ``llvm::None`` on
/// error or if inclusion directive already exists.
llvm::Optional<FixItHint>
CreateIncludeInsertion(FileID FileID, llvm::StringRef Header, bool IsAngled);
private:
void AddInclude(StringRef FileName, bool IsAngled,
SourceLocation HashLocation, SourceLocation EndLocation);
IncludeSorter &getOrCreate(FileID FileID);
llvm::DenseMap<FileID, std::unique_ptr<IncludeSorter>> IncludeSorterByFile;
llvm::DenseMap<FileID, std::set<std::string>> InsertedHeaders;
const SourceManager &SourceMgr;
const IncludeSorter::IncludeStyle Style;
friend class IncludeInserterCallback;
};
} // namespace utils
} // namespace tidy
} // namespace clang
#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_INCLUDEINSERTER_H
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