get the Line number in the xml file

[Haydar1990]

Hello ,

I'm trying to parse a .xml file then with xpath read some nodes and attribute then i want to make some logical test to see if my xml file some contents error has and then i want to show the line number of the xml file with the error.

can someone help me please.

Thank you.

[cecilios]

I think pugixml does not provides line information. So in my library (https://github.com/lenmus/lomse) I re-read the file for counting lines and creating a table relating node offset to line number. This is the code (MIT licensed):

//---------------------------------------------------------------------------------------
bool XmlParser::build_offset_data(const char* filename)
{
    //AWARE:
    // * Windows and DOS use a pair of CR (\r) and LF (\n) chars to end lines
    // * UNIX (including Linux and FreeBSD) uses only an LF char
    // * OS X also uses a single LF character
    // * The old classic Mac operating system used a single CR char
    //This code does not handle old Mac-style line breaks but it is not expected
    //to run in these old machines.
    //Also, this code does not handle tabs, that are counted as 1 char

    m_offsetData.clear();

    FILE* f = fopen(filename, "rb");
    if (!f)
        return false;

    ptrdiff_t offset = 0;

    char buffer[1024];
    size_t size;

    while ((size = fread(buffer, 1, sizeof(buffer), f)) > 0)
    {
        for (size_t i = 0; i < size; ++i)
            if (buffer[i] == '\n')
                m_offsetData.push_back(offset + i);

        offset += size;
    }

    fclose(f);

    return true;
}

//---------------------------------------------------------------------------------------
std::pair<int, int> XmlParser::get_location(ptrdiff_t offset)
{
    vector<ptrdiff_t>::const_iterator it =
        std::lower_bound(m_offsetData.begin(), m_offsetData.end(), offset);
    size_t index = it - m_offsetData.begin();

    return std::make_pair(1 + index, index == 0 ? offset + 1
                                                : offset - m_offsetData[index - 1]);
}

//---------------------------------------------------------------------------------------
int XmlParser::get_line_number(XmlNode* node)
{
    ptrdiff_t offset = node->offset();
    if (!m_fOffsetDataReady && !m_filename.empty())
        m_fOffsetDataReady = build_offset_data(m_filename.c_str());

    if ( m_fOffsetDataReady)
    {
        std::pair<int, int> pos = get_location(offset);
        return pos.first;
    }
    else
        return 0;
}

[Haydar1990]

I think pugixml does not provides line information. So in my library (https://github.com/lenmus/lomse) I re-read the file for counting lines and creating a table relating node offset to line number. This is the code (MIT licensed):

//---------------------------------------------------------------------------------------
bool XmlParser::build_offset_data(const char* filename)
{
    //AWARE:
    // * Windows and DOS use a pair of CR (\r) and LF (\n) chars to end lines
    // * UNIX (including Linux and FreeBSD) uses only an LF char
    // * OS X also uses a single LF character
    // * The old classic Mac operating system used a single CR char
    //This code does not handle old Mac-style line breaks but it is not expected
    //to run in these old machines.
    //Also, this code does not handle tabs, that are counted as 1 char

    m_offsetData.clear();

    FILE* f = fopen(filename, "rb");
    if (!f)
        return false;

    ptrdiff_t offset = 0;

    char buffer[1024];
    size_t size;

    while ((size = fread(buffer, 1, sizeof(buffer), f)) > 0)
    {
        for (size_t i = 0; i < size; ++i)
            if (buffer[i] == '\n')
                m_offsetData.push_back(offset + i);

        offset += size;
    }

    fclose(f);

    return true;
}

//---------------------------------------------------------------------------------------
std::pair<int, int> XmlParser::get_location(ptrdiff_t offset)
{
    vector<ptrdiff_t>::const_iterator it =
        std::lower_bound(m_offsetData.begin(), m_offsetData.end(), offset);
    size_t index = it - m_offsetData.begin();

    return std::make_pair(1 + index, index == 0 ? offset + 1
                                                : offset - m_offsetData[index - 1]);
}

//---------------------------------------------------------------------------------------
int XmlParser::get_line_number(XmlNode* node)
{
    ptrdiff_t offset = node->offset();
    if (!m_fOffsetDataReady && !m_filename.empty())
        m_fOffsetDataReady = build_offset_data(m_filename.c_str());

    if ( m_fOffsetDataReady)
    {
        std::pair<int, int> pos = get_location(offset);
        return pos.first;
    }
    else
        return 0;
}

Thank you i'll try it.

[zeux]

Also see #12.