csv-reader.h

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/*
 * Copyright (c) 2019 Lawrence Livermore National Laboratory
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Mathew Bielejeski <bielejeski1@llnl.gov>
 */
 
#ifndef NS3_CSV_READER_H_
#define NS3_CSV_READER_H_
 
#include <cstddef>
#include <cstdint>
#include <fstream>
#include <istream>
#include <string>
#include <vector>
 
namespace ns3
{
 
class CsvReader
{
  public:
    CsvReader(const std::string& filepath, char delimiter = ',');
 
    CsvReader(std::istream& stream, char delimiter = ',');
 
    virtual ~CsvReader();
 
    std::size_t ColumnCount() const;
 
    std::size_t RowNumber() const;
 
    char Delimiter() const;
 
    bool FetchNextRow();
 
    template <class T>
    bool GetValue(std::size_t columnIndex, T& value) const;
 
    bool IsBlankRow() const;
 
  private:
    bool GetValueAs(std::string input, double& value) const;
 
    bool GetValueAs(std::string input, float& value) const;
 
    bool GetValueAs(std::string input, signed char& value) const;
 
    bool GetValueAs(std::string input, short& value) const;
 
    bool GetValueAs(std::string input, int& value) const;
 
    bool GetValueAs(std::string input, long& value) const;
 
    bool GetValueAs(std::string input, long long& value) const;
 
    bool GetValueAs(std::string input, std::string& value) const;
 
    bool GetValueAs(std::string input, unsigned char& value) const;
 
    bool GetValueAs(std::string input, unsigned short& value) const;
 
    bool GetValueAs(std::string input, unsigned int& value) const;
 
    bool GetValueAs(std::string input, unsigned long& value) const;
 
    bool GetValueAs(std::string input, unsigned long long& value) const;
    bool IsDelimiter(char c) const;
 
    void ParseLine(const std::string& line);
 
    std::tuple<std::string, std::string::const_iterator> ParseColumn(
        std::string::const_iterator begin,
        std::string::const_iterator end);
 
    typedef std::vector<std::string> Columns;
 
    char m_delimiter;           
    std::size_t m_rowsRead;     
    Columns m_columns;          
    bool m_blankRow;            
    std::ifstream m_fileStream; 
 
    std::istream* m_stream;
 
}; // class CsvReader
 
/****************************************************
 *      Template implementations.
 ***************************************************/
 
template <class T>
bool
CsvReader::GetValue(std::size_t columnIndex, T& value) const
{
    if (columnIndex >= ColumnCount())
    {
        return false;
    }
 
    std::string cell = m_columns[columnIndex];
 
    return GetValueAs(std::move(cell), value);
}
 
} //  namespace ns3
 
#endif //  NS3_CSV_READER_H_