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       1                 :            : // *****************************************************************************
       2                 :            : /*!
       3                 :            :   \file      src/IO/MeshDetect.cpp
       4                 :            :   \copyright 2012-2015 J. Bakosi,
       5                 :            :              2016-2018 Los Alamos National Security, LLC.,
       6                 :            :              2019-2021 Triad National Security, LLC.
       7                 :            :              All rights reserved. See the LICENSE file for details.
       8                 :            :   \brief     Unstructured mesh file format detection
       9                 :            :   \details   Unstructured mesh file format detection functions.
      10                 :            : */
      11                 :            : // *****************************************************************************
      12                 :            : 
      13                 :            : #include <string>
      14                 :            : #include <fstream>
      15                 :            : #include <stdexcept>
      16                 :            : 
      17                 :            : #include "MeshDetect.hpp"
      18                 :            : #include "Exception.hpp"
      19                 :            : #include "Reader.hpp"
      20                 :            : 
      21                 :            : namespace tk {
      22                 :            : 
      23                 :            : MeshReaderType
      24                 :        842 : detectInput( const std::string& filename )
      25                 :            : // *****************************************************************************
      26                 :            : //  Detect input mesh file type
      27                 :            : //! \param[in] filename File to open and detect its type
      28                 :            : //! \return enum specifying the mesh reader type
      29                 :            : // *****************************************************************************
      30                 :            : {
      31                 :       1683 :   std::ifstream inFile;
      32                 :            : 
      33                 :            :   // Check if file exists, throw exception if it does not
      34         [ +  - ]:        842 :   inFile.open( filename, std::ifstream::in );
      35 [ -  + ][ -  - ]:        842 :   ErrChk( inFile.good(), "Failed to open file: " + filename );
         [ -  - ][ -  - ]
         [ -  - ][ -  - ]
      36                 :            : 
      37                 :            :   // Attempt to read a character, throw if it fails
      38                 :            :   // It is curious that on some systems opening a directory instead of a file
      39                 :            :   // with the above ifstream::open() call does not set the failbit. Thus we get
      40                 :            :   // here fine, so we try to read a character from it. If the read fails, we
      41                 :            :   // assume it is a directory and assume that it is in Omega_h osh file format.
      42                 :            :   // Read more at: http://stackoverflow.com/questions/9591036/
      43                 :            :   // ifstream-open-doesnt-set-error-bits-when-argument-is-a-directory.
      44         [ +  - ]:        842 :   inFile.get();
      45         [ +  - ]:        842 :   if (!inFile.good()) return MeshReaderType::OMEGA_H;
      46                 :            : 
      47                 :            :   // Close it
      48         [ +  - ]:        842 :   inFile.close();
      49 [ -  + ][ -  - ]:        842 :   ErrChk( !inFile.fail(), "Failed to close file: " + filename );
         [ -  - ][ -  - ]
         [ -  - ][ -  - ]
      50                 :            : 
      51                 :            :   // Get first three letters from input file
      52 [ +  - ][ +  - ]:       1685 :   std::string s( Reader( filename ).firstline().substr(0,4) );
                 [ +  - ]
      53                 :            : 
      54         [ +  + ]:        842 :   if ( s.find("$Me") != std::string::npos ) {
      55                 :            :     return MeshReaderType::GMSH;
      56 [ +  + ][ -  + ]:        847 :   } else if ( s.find("CDF") != std::string::npos ||
      57                 :            :               s.find("HDF") != std::string::npos ) {
      58                 :        827 :     return MeshReaderType::EXODUSII;
      59         [ +  + ]:         10 :   } else if ( s.find("<?x") != std::string::npos ) {
      60                 :            :     return MeshReaderType::HYPER;
      61         [ +  + ]:          9 :   } else if ( s.find("*nd") != std::string::npos ) {
      62                 :            :     return MeshReaderType::ASC;
      63         [ +  + ]:          5 :   } else if ( s.find("   ") != std::string::npos ) {
      64                 :            :     return MeshReaderType::UGRID;
      65         [ +  + ]:          4 :   } else if ( s.find(" npo") != std::string::npos ) {
      66                 :            :     return MeshReaderType::RDGFLO;
      67                 :            :   } else {
      68                 :            :     try {
      69                 :            :       // cppcheck-suppress ignoredReturnValue
      70                 :            :       std::stoi(s);    // try to convert to an integer
      71                 :          2 :     } catch ( const std::invalid_argument& ) {
      72 [ +  - ][ +  - ]:          2 :       Throw( "Input mesh file type could not be determined from header: " +
         [ +  - ][ -  + ]
                 [ -  + ]
      73                 :            :              filename );
      74                 :            :     }
      75                 :            :     // could also catch std::out_of_range, the other exception potentially
      76                 :            :     // thrown by std::stoi(), but a three-digit integer will always fit into int
      77                 :            : 
      78                 :            :     // if we got here, the above string-to-integer conversion succeeded
      79                 :            :     return MeshReaderType::NETGEN;
      80                 :            :   }
      81                 :            : }
      82                 :            : 
      83                 :            : MeshWriterType
      84                 :         18 : pickOutput( const std::string& filename )
      85                 :            : // *****************************************************************************
      86                 :            : //  Determine output mesh file type
      87                 :            : //! \param[in] filename Filename to pick its type based on extension given
      88                 :            : //! \return enum specifying the mesh writer type
      89                 :            : // *****************************************************************************
      90                 :            : {
      91                 :            :   // Get extension of input file name
      92                 :            :   std::string fn = filename;
      93         [ +  - ]:         18 :   std::string ext( fn.substr(fn.find_last_of(".") + 1) );
      94                 :            : 
      95         [ +  + ]:         18 :   if ( ext == "msh" ) {
      96                 :            :     return MeshWriterType::GMSH;
      97 [ +  + ][ -  + ]:         18 :   } else if ( ext == "exo" || ext == "h5" ) {
      98                 :         10 :     return MeshWriterType::EXODUSII;
      99         [ -  + ]:          4 :   } else if ( ext == "mesh" ) {
     100                 :            :     return MeshWriterType::NETGEN;
     101                 :            :   } else {
     102 [ -  - ][ -  - ]:          0 :     Throw( "Output mesh file type could not be determined from extension of "
         [ -  - ][ -  - ]
         [ -  - ][ -  - ]
         [ -  - ][ -  - ]
     103                 :            :            "filename '" + filename + "'; valid extensions are: "
     104                 :            :            "'msh' for Gmsh, 'exo' or 'h5' for ExodusII, 'mesh' for Netgen's "
     105                 :            :            "neutral" );
     106                 :            :   }
     107                 :            : }
     108                 :            : 
     109                 :            : } // tk::