path_search.h

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// ---------------------------------------------------------------------
//
// Copyright (C) 2005 - 2022 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE.md at
// the top level directory of deal.II.
//
// ---------------------------------------------------------------------
 
#ifndef dealii_path_search_h
#define dealii_path_search_h
 
 
#include <deal.II/base/config.h>
 
#include <deal.II/base/exceptions.h>
 
#include <fstream>
#include <map>
#include <memory>
#include <string>
#include <vector>
 
 
DEAL_II_NAMESPACE_OPEN
 
class PathSearch
{
public:
  enum Position
  {
    back,
    front,
    after_none
  };
 
  PathSearch(const std::string &cls, const unsigned int debug = 0);
 
  std::string
  find(const std::string &filename, const char *open_mode = "r");
 
  std::string
  find(const std::string &filename,
       const std::string &suffix,
       const char *       open_mode = "r");
 
  template <class StreamType>
  void
  show(StreamType &stream) const;
 
  static void
  add_class(const std::string &cls);
 
  void
  add_path(const std::string &path, Position pos = back);
 
  void
  add_suffix(const std::string &suffix, Position pos = back);
 
  DeclException1(ExcNoClass,
                 std::string,
                 << "The class " << arg1
                 << " must be registered before referring it in PathSearch.");
  DeclException2(ExcFileNotFound,
                 std::string,
                 std::string,
                 << "The file \"" << arg1 << "\" was not found in the path for "
                 << "files of class " << arg2 << '.');
 
private:
  using map_type = std::map<std::string, std::vector<std::string>>::value_type;
 
  static void
  initialize_classes();
 
  static std::vector<std::string> &
  get_path_list(const std::string &cls);
 
  static std::vector<std::string> &
  get_suffix_list(const std::string &cls);
 
  const std::string cls;
 
  static std::map<std::string, std::vector<std::string>> path_lists;
 
  static std::map<std::string, std::vector<std::string>> suffix_lists;
 
  std::vector<std::string> &my_path_list;
 
  std::vector<std::string> &my_suffix_list;
 
  const unsigned int debug;
 
  static std::string empty;
};
 
 
/* ----------------------------- inline functions ------------------------- */
 
 
template <class StreamType>
inline void
PathSearch::show(StreamType &out) const
{
  out << "DEAL_II_" << cls << "PATH=\"";
  bool first = true;
  for (const auto &p : my_path_list)
    {
      if (!first)
        out << ':';
      out << p;
      first = false;
    }
  out << '"' << std::endl << " Suffixes";
  for (const auto &s : my_suffix_list)
    out << " \"" << s << '"';
  out << std::endl;
}
 
DEAL_II_NAMESPACE_CLOSE
 
#endif