Method GroupFileNames

IO/Core/vtkSortFileNames.cxx:150–267

}

void vtkSortFileNames::GroupFileNames(vtkStringArray* input, vtkStringArrayVector* output)
{
  std::string baseName;
  std::string extension;
  std::string fileNamePath;
  std::string reducedName;

  std::list<unsigned int> ungroupedFiles;
  std::vector<std::string> reducedFileNames;

  vtkIdType numberOfStrings = input->GetNumberOfValues();
  for (vtkIdType i = 0; i < numberOfStrings; i++)
  {
    std::string& fileName = input->GetValue(i);
    extension = vtksys::SystemTools::GetFilenameLastExtension(fileName);
    fileNamePath = vtksys::SystemTools::GetFilenamePath(fileName);
    baseName = vtksys::SystemTools::GetFilenameWithoutLastExtension(fileName);

    // If extension is all digits, it is not a true extension, so
    // add it back onto the filename.  Note that the extension
    // includes the leading dot.
    int numericExtension = 1;
    for (unsigned int j = 1; j < extension.length(); j++)
    {
      if (!(extension[j] >= '0' && extension[j] <= '9'))
      {
        numericExtension = 0;
      }
    }
    if (numericExtension && !extension.empty())
    {
      baseName.append(extension);
      extension = "";
    }

    // Create a reduced filename that replaces all digit sequences
    // in the filename with a single digit "0". We begin by setting
    // the reduced filename to the path.
    reducedName = fileNamePath + "/";
    int inDigitBlock = 0;
    unsigned int charBlockStart = 0;
    unsigned int stringLength = static_cast<unsigned int>(baseName.length());
    for (unsigned int k = 0; k < stringLength; k++)
    {
      if (baseName[k] >= '0' && baseName[k] <= '9')
      {
        if (!inDigitBlock && k != 0)
        {
          reducedName.append(baseName.substr(charBlockStart, k - charBlockStart));
          reducedName.append("0");
        }
        inDigitBlock = 1;
      }
      else
      {
        if (inDigitBlock)
        {
          charBlockStart = k;