CTextFileLinesParser.cpp

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
 
#include "io-precomp.h"  // Precompiled headers
 
#include <mrpt/io/CTextFileLinesParser.h>
#include <mrpt/system/string_utils.h>
#include <mrpt/core/exceptions.h>
#include <sstream>
 
using namespace mrpt::io;
using namespace std;
 
CTextFileLinesParser::CTextFileLinesParser(const std::string& fil)
{
        open(fil);
}
 
void CTextFileLinesParser::open(const std::string& fil)
{
        m_curLineNum = 0;
        m_fileName = fil;
        m_in.close();
        m_in.clear();
        m_in.open(fil.c_str());
        if (!m_in.is_open())
                THROW_EXCEPTION_FMT("Error opening file '%s' for reading", fil.c_str());
}
 
void CTextFileLinesParser::close() { m_in.close(); }
void CTextFileLinesParser::rewind()
{
        m_curLineNum = 0;
        m_in.clear();
        m_in.seekg(0);
}
 
bool CTextFileLinesParser::getNextLine(std::string& out_str)
{
        std::istringstream buf;
        if (getNextLine(buf))
        {
                out_str = buf.str();
                return true;
        }
 
        out_str.clear();
        return false;
}
 
bool CTextFileLinesParser::getNextLine(std::istringstream& buf)
{
        while (!m_in.fail())
        {
                std::string lin;
                std::getline(m_in, lin);
                m_curLineNum++;
                lin = mrpt::system::trim(lin);
                if (lin.empty()) continue;  // Ignore empty lines.
                // Ignore comments lines, starting with "#" or "//".
                if ((m_filter_SH_comments && mrpt::system::strStarts(lin, "#")) ||
                        (m_filter_C_comments && mrpt::system::strStarts(lin, "//")) ||
                        (m_filter_MATLAB_comments && mrpt::system::strStarts(lin, "%")))
                        continue;
                // Parse the line as a string stream:
                buf.str(lin);
                buf.clear();
                return true;
        };
        return false;
}
 
size_t CTextFileLinesParser::getCurrentLineNumber() const
{
        return m_curLineNum;
}
 
void CTextFileLinesParser::enableCommentFilters(
        bool filter_MATLAB_comments, bool filter_C_comments,
        bool filter_SH_comments)
{
        m_filter_MATLAB_comments = filter_MATLAB_comments;
        m_filter_C_comments = filter_C_comments;
        m_filter_SH_comments = filter_SH_comments;
}