Method ExpandPath

IO/Geometry/vtkOpenFOAMReader.cxx:2052–2237

  // Member Functions

  std::string ExpandPath(const std::string& pathIn, const std::string& defaultPath)
  {
    std::string expandedPath;
    bool isExpanded = false, wasPathSeparator = true;
    size_t charI = 0;
    const size_t nChars = pathIn.length();

    std::string::size_type delim = 0;

    if ('<' == pathIn[0] && (delim = pathIn.find(">/")) != std::string::npos)
    {
      // Expand a leading <tag>/
      // Convenient for frequently used directories - see OpenFOAM stringOps.C
      //
      // Handle
      //   <case>/       => FOAM_CASE directory
      //   <constant>/   => FOAM_CASE/constant directory
      //   <system>/     => FOAM_CASE/system directory
      //   <etc>/        => not handled

      const std::string tag(pathIn, 1, delim - 2);

      if (tag == "case")
      {
        expandedPath = this->CasePath + '/';
        isExpanded = true;
        wasPathSeparator = false;
      }
      else if (tag == "constant" || tag == "system")
      {
        expandedPath = this->CasePath + '/' + tag + '/';
        isExpanded = true;
        wasPathSeparator = false;
      }
      // <etc> in not handled

      if (isExpanded)
      {
        charI = delim + 2;
      }
    }

    while (charI < nChars)
    {
      const char c = pathIn[charI];
      switch (c)
      {
        case '$': // $-variable expansion
        {
          std::string variable;
          ++charI; // skip the '$'
          while (charI < nChars && (isalnum(pathIn[charI]) || pathIn[charI] == '_'))
          {
            variable += pathIn[charI++];
          }
          if (variable == "FOAM_CASE") // discard path until the variable
          {
            expandedPath = this->CasePath;