HeaderMapCollector.h

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//===-- 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 {
 
/// 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] = std::string(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