//===--- HeaderSourceSwitch.h - ----------------------------------*- 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_CLANGD_HEADERSOURCESWITCH_H
#define LLVM_CLANG_TOOLS_EXTRA_CLANGD_HEADERSOURCESWITCH_H

#include "ParsedAST.h"
#include <optional>

namespace clang {
namespace clangd {

/// Given a header file, returns the best matching source file, and vice visa.
/// It only uses the filename heuristics to do the inference.
std::optional<Path> getCorrespondingHeaderOrSource(
    PathRef OriginalFile, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS);

/// Given a header file, returns the best matching source file, and vice visa.
/// The heuristics incorporate with the AST and the index (if provided).
std::optional<Path> getCorrespondingHeaderOrSource(PathRef OriginalFile,
                                                   ParsedAST &AST,
                                                   const SymbolIndex *Index);

/// Returns all indexable decls that are present in the main file of the AST.
/// Exposed for unittests.
std::vector<const Decl *> getIndexableLocalDecls(ParsedAST &AST);

} // namespace clangd
} // namespace clang

#endif // LLVM_CLANG_TOOLS_EXTRA_CLANGD_HEADERSOURCESWITCH_H