CountingStreamBuffer.h

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#ifndef COUNTING_STREAM_BUFFER_H_
#define COUNTING_STREAM_BUFFER_H_
 
#include <cstddef>
#include <iostream>
#include <fstream>
#include <string>
#include <streambuf>
 
 
class CountingStreamBuffer final : public std::streambuf {
 
  public:
 
 
    CountingStreamBuffer(const std::string& _filename);
 
    // Disallow copy and assignment
    CountingStreamBuffer(const CountingStreamBuffer&) = delete;
    CountingStreamBuffer& operator=(const CountingStreamBuffer&) = delete;
 
 
    size_t LineNumber() const;
 
    size_t PrevLineNumber() const;
 
    size_t Column() const;
 
    std::streamsize FilePos() const;
 
    std::string Where() const;
 
 
  private:
 
 
    virtual std::streambuf::int_type underflow() override;
 
    virtual std::streambuf::int_type uflow() override;
 
    virtual std::streambuf::int_type pbackfail(std::streambuf::int_type _c)
        override;
 
    virtual std::ios::pos_type seekoff(std::ios::off_type _pos,
        std::ios_base::seekdir _dir, std::ios_base::openmode _mode) override;
 
    virtual std::ios::pos_type seekpos(std::ios::pos_type _pos,
        std::ios_base::openmode _mode) override;
 
 
    std::string m_filename;                  
    std::ifstream m_fileStream;              
    std::streambuf* m_streamBuffer{nullptr}; 
    std::streamsize m_filePos;               
 
    size_t m_line;                      
    size_t m_prevLine;                  
    size_t m_column;                    
    size_t m_prevColumn;                
 
 
};
 
#endif