Teuchos_MatrixMarket_generic.hpp

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// @HEADER
// *****************************************************************************
//          Tpetra: Templated Linear Algebra Services Package
//
// Copyright 2008 NTESS and the Tpetra contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef __Teuchos_MatrixMarket_generic_hpp
#define __Teuchos_MatrixMarket_generic_hpp

#include "Teuchos_ConfigDefs.hpp"
#ifdef HAVE_TEUCHOS_COMPLEX
#  include <complex>
#endif // HAVE_TEUCHOS_COMPLEX
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <type_traits>
#include <vector>

namespace Teuchos {
  namespace MatrixMarket {

    int maxLineLength();

    TEUCHOSNUMERICS_LIB_DLL_EXPORT bool
    checkCommentLine (const std::string& line,
                      size_t& start,
                      size_t& size,
                      const size_t lineNumber,
                      const bool tolerant,
                      const bool maybeBannerLine = false);

    template<class Ordinal>
    bool
    readPatternData (std::istream& istr,
                     Ordinal& rowIndex,
                     Ordinal& colIndex,
                     const size_t lineNumber,
                     const bool tolerant)
    {
      Ordinal the_rowIndex, the_colIndex;

      if (istr.eof() || istr.fail())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Unable to read any data from line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      istr >> the_rowIndex;
      if (istr.fail())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Failed to get row index from line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      else if (istr.eof())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "No more data after row index on line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      istr >> the_colIndex;
      if (istr.fail())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Failed to get column index from line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      rowIndex = the_rowIndex;
      colIndex = the_colIndex;
      return true;
    }

    template<class Ordinal, class Real>
    bool
    readRealData (std::istream& istr,
                  Ordinal& rowIndex,
                  Ordinal& colIndex,
                  Real& realValue,
                  const size_t lineNumber,
                  const bool tolerant)
    {
      Real the_realValue;
      if (! readPatternData (istr, rowIndex, colIndex, lineNumber, tolerant))
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Failed to read pattern data from line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      if (istr.eof())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "No more data after pattern data on line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      {
        if (std::is_same<Real, float>::value) {
          double dblVal {};
          istr >> dblVal;
          the_realValue = static_cast<Real> (dblVal);
        }
        else {
          istr >> the_realValue;
        }
      }
      if (istr.fail())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Failed to get real value from line " << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      realValue = the_realValue;
      return true;
    }

#ifdef HAVE_TEUCHOS_COMPLEX

    template<class Ordinal, class Real>
    bool
    readComplexData (std::istream& istr,
                     Ordinal& rowIndex,
                     Ordinal& colIndex,
                     Real& realPart,
                     Real& imagPart,
                     const size_t lineNumber,
                     const bool tolerant)
    {
      Real the_realPart, the_imagPart;
      if (! readRealData (istr, rowIndex, colIndex, the_realPart, lineNumber, tolerant))
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Failed to read pattern data and/or real value from line "
                 << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      if (istr.eof())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "No more data after real value on line "
                 << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      istr >> the_imagPart;
      if (istr.fail())
        {
          if (tolerant)
            return false;
          else
            {
              std::ostringstream os;
              os << "Failed to get imaginary value from line "
                 << lineNumber << " of input";
              throw std::invalid_argument(os.str());
            }
        }
      realPart = the_realPart;
      imagPart = the_imagPart;
      return true;
    }
#endif // HAVE_TEUCHOS_COMPLEX

    template<class Ordinal>
    bool
    readPatternLine (const std::string& line, // only the data-containing part
                     Ordinal& rowIndex,
                     Ordinal& colIndex,
                     const size_t lineNumber,
                     const bool tolerant)
    {
      // The part of the line that contains data
      std::istringstream istr (line);
      return readPatternData (istr, rowIndex, colIndex, lineNumber, tolerant);
    }

    template<class Ordinal, class Real>
    bool
    readRealLine (const std::string& line,
                  Ordinal& rowIndex,
                  Ordinal& colIndex,
                  Real& realValue,
                  const size_t lineNumber,
                  const bool tolerant)
    {
      size_t start, size;
      if (checkCommentLine (line, start, size, lineNumber, tolerant)) {
        return false; // It's a comment line
      }
      // If it's an empty line, checkCommentLine() will throw an
      // exception if non-tolerant parsing is being performed, so
      // we need only return false otherwise.
      if (size == 0) {
        if (! tolerant) {
          throw std::logic_error("Should never get here! checkCommentLine() "
                                 "is supposed to catch empty lines.");
        }
        else {
          return false;
        }
      }
      // The part of the line that contains data
      std::istringstream istr (line.substr (start, size));
      return readRealData (istr, rowIndex, colIndex, realValue, lineNumber, tolerant);
    }

#ifdef HAVE_TEUCHOS_COMPLEX
    template<class Ordinal, class Real>
    bool
    readComplexLine (const std::string& line,
                     Ordinal& rowIndex,
                     Ordinal& colIndex,
                     Real& realPart,
                     Real& imagPart,
                     const size_t lineNumber,
                     const bool tolerant)
    {
      size_t start, end;
      if (checkCommentLine (line, start, end, lineNumber, tolerant))
        return false; // It's a comment line
      // If it's an empty line, checkCommentLine() will throw an
      // exception if non-tolerant parsing is being performed, so
      // we need only return false otherwise.
      if (end == 0)
        {
          if (tolerant)
            throw std::logic_error("Should never get here! checkCommentLine() "
                                   "is supposed to catch empty lines.");
          else
            return false;
        }
      // The part of the line that contains data
      std::istringstream istr (line.substr (start, end));
      // Read the data
      Real the_realPart, the_imagPart;
      const bool success =
        readComplexData (istr, rowIndex, colIndex, the_realPart, the_imagPart,
                         lineNumber, tolerant);
      if (success)
        {
          realPart = the_realPart;
          imagPart = the_imagPart;
        }
      return success;
    }
#endif // HAVE_TEUCHOS_COMPLEX

    template<class Ordinal, class PatternCallback>
    std::pair<bool, std::vector<size_t> >
    readPatternCoordinateData (std::istream& in,
                               PatternCallback add,
                               const size_t startingLineNumber,
                               const bool tolerant)
    {
      std::string line;
      size_t lineNumber = startingLineNumber;
      bool anySucceeded = false;
      bool allSucceeded = true;
      std::vector<size_t> badLineNumbers;
      while (getline (in, line)) {
        size_t start, size;
        if (checkCommentLine (line, start, size, lineNumber, tolerant)) {
          continue; // it's a comment line
        }
        const std::string theLine = line.substr (start, size);

        Ordinal rowIndex, colIndex;
        const bool localSuccess =
          readPatternLine (theLine, rowIndex, colIndex,
                           lineNumber++, tolerant);
        anySucceeded = anySucceeded || localSuccess;
        allSucceeded = allSucceeded && localSuccess;
        if (! localSuccess) {
          badLineNumbers.push_back (lineNumber);
        }
        else {
          // Add the newly read entry to the sparse graph.
          add(rowIndex, colIndex);
        }
      }
      if (lineNumber == startingLineNumber) {
        anySucceeded = true; // Trivially true
      }

      return std::make_pair (allSucceeded, badLineNumbers);
    }


    template<class Ordinal>
    bool
    readCoordinateDimensions (std::istream& in,
                              Ordinal& numRows,
                              Ordinal& numCols,
                              Ordinal& numNonzeros,
                              size_t& lineNumber,
                              const bool tolerant)
    {
      using std::endl;

      Ordinal the_numRows, the_numCols, the_numNonzeros;
      std::string line;

      // Keep reading lines from the input stream until we find a
      // non-comment line, or until we run out of lines.  The latter
      // is an error, since every "coordinate" format Matrix Market
      // file must have a dimensions line after the banner (even if
      // the matrix has zero rows or columns, or zero entries).
      bool commentLine = true;
      while (commentLine)
        {
          // Is it even valid to read from the input stream?
          if (in.eof () || in.fail ()) {
            if (tolerant) {
              return false;
            }
            else {
              std::ostringstream os;
              os << "Unable to get coordinate dimensions line (at all) "
                "from (line " << lineNumber << ") of input stream; the "
                "input stream claims that it is at \"end-of-file\" or has "
                "an otherwise \"fail\"ed state.";
              throw std::invalid_argument(os.str());
            }
          }
          // Try to get the next line from the input stream.
          if (! getline (in, line)) {
            if (tolerant) {
              return false;
            }
            else {
              std::ostringstream os;
              os << "Failed to read coordinate dimensions line (at all) "
                "from (line " << lineNumber << " from input stream.  The "
                "line should contain the coordinate matrix dimensions in "
                 << " the form \"<numRows> <numCols> <numNonzeros>\".";
              throw std::invalid_argument(os.str());
            }
          }
          // Is the current line a comment line?  Ignore start and
          // size; they are only useful for reading the actual matrix
          // entries.  (We could use them here as an optimization, but
          // we've chosen not to.)
          size_t start = 0, size = 0;
          commentLine = checkCommentLine (line, start, size,
                                          lineNumber, tolerant);
          // This ensures that any error messages in this file are
          // correct.
          if (commentLine) {
            ++lineNumber;
          }
        }

      // The current line is now not a comment line.
      // Try to read the coordinate dimensions from it.
      std::istringstream istr (line);
      if (istr.eof () || istr.fail ()) {
        if (tolerant) {
          return false;
        }
        else {
          std::ostringstream os;
          os << "Unable to read any coordinate dimensions data from line "
             << lineNumber << " of input stream.  Offending line:" << endl
             << line;
          throw std::invalid_argument(os.str());
        }
      }
      istr >> the_numRows;
      if (istr.fail ()) {
        if (tolerant) {
          return false;
        }
        else {
          std::ostringstream os;
          os << "Failed to get number of rows from the coordinate "
            "dimensions line (line " << lineNumber << " of input stream)."
            "   Offending line:" << endl << line;
          throw std::invalid_argument(os.str());
        }
      }
      else if (istr.eof ()) {
        if (tolerant) {
          return false;
        }
        else {
          std::ostringstream os;
          os << "No more data after number of rows, in the coordinate "
            "dimensions line (line " << lineNumber << " of input stream)."
            "   Offending line:" << endl << line;
          throw std::invalid_argument(os.str());
        }
      }
      istr >> the_numCols;
      if (istr.fail ()) {
        if (tolerant) {
          return false;
        }
        else {
          std::ostringstream os;
          os << "Failed to get number of columns from the coordinate "
            "dimensions line (line " << lineNumber << " of input stream)."
            "   Offending line:" << endl << line;
          throw std::invalid_argument(os.str());
        }
      }
      else if (istr.eof ()) {
        if (tolerant) {
          return false;
        }
        else {
          std::ostringstream os;
          os << "No more data after number of columns, in the coordinate "
            "dimensions line (line " << lineNumber << " of input stream)."
            "   Offending line:" << endl << line;
          throw std::invalid_argument (os.str ());
        }
      }
      istr >> the_numNonzeros;
      if (istr.fail ()) {
        if (tolerant) {
          return false;
        }
        else {
          std::ostringstream os;
          os << "Failed to get number of nonzeros from the coordinate "
            "dimensions line (line " << lineNumber << " of input stream)."
            "   Offending line:" << endl << line;
          throw std::invalid_argument (os.str ());
        }
      }
      numRows = the_numRows;
      numCols = the_numCols;
      numNonzeros = the_numNonzeros;
      // This function only increments the line number when it reads a
      // comment line successfully, or when it reads all the
      // coordinate dimensions successfully.
      ++lineNumber;
      return true;
    }

  } // namespace MatrixMarket
} // namespace Teuchos

#endif // __Teuchos_MatrixMarket_generic_hpp