//===-- HeaderMapCoolector.h - find all symbols------------------*- 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_FIND_ALL_SYMBOLS_HEADER_MAP_COLLECTOR_H
#define LLVM_CLANG_TOOLS_EXTRA_FIND_ALL_SYMBOLS_HEADER_MAP_COLLECTOR_H

#include "llvm/ADT/StringMap.h"
#include "llvm/Support/Regex.h"
#include <string>
#include <vector>

namespace clang {
namespace find_all_symbols {

/// \brief HeaderMappCollector collects all remapping header files. This maps
/// complete header names or header name regex patterns to header names.
class HeaderMapCollector {
public:
  typedef llvm::StringMap<std::string> HeaderMap;
  typedef std::vector<std::pair<const char *, const char *>> RegexHeaderMap;

  HeaderMapCollector() = default;
  explicit HeaderMapCollector(const RegexHeaderMap *RegexHeaderMappingTable);

  void addHeaderMapping(llvm::StringRef OrignalHeaderPath,
                        llvm::StringRef MappingHeaderPath) {
    HeaderMappingTable[OrignalHeaderPath] = MappingHeaderPath;
  };

  /// Check if there is a mapping from \p Header or a regex pattern that matches
  /// it to another header name.
  /// \param Header A header name.
  /// \return \p Header itself if there is no mapping for it; otherwise, return
  /// a mapped header name.
  llvm::StringRef getMappedHeader(llvm::StringRef Header) const;

private:
  /// A string-to-string map saving the mapping relationship.
  HeaderMap HeaderMappingTable;

  // A map from header patterns to header names.
  // The header names are not owned. This is only threadsafe because the regexes
  // never fail.
  mutable std::vector<std::pair<llvm::Regex, const char *>>
      RegexHeaderMappingTable;
};

} // namespace find_all_symbols
} // namespace clang

#endif // LLVM_CLANG_TOOLS_EXTRA_FIND_ALL_SYMBOLS_HEADER_MAP_COLLECTOR_H