Function writeQueryWithHighlightedErrorPositions

src/Parsers/parseQuery.cpp:70–102

Highlight the place of syntax error.

/// Highlight the place of syntax error.
void writeQueryWithHighlightedErrorPositions(
    WriteBuffer & out,
    const char * begin,
    const char * end,
    const Token * positions_to_hilite,   /// must go in ascending order
    size_t num_positions_to_hilite)
{
    const char * pos = begin;
    for (size_t position_to_hilite_idx = 0; position_to_hilite_idx < num_positions_to_hilite; ++position_to_hilite_idx)
    {
        const char * current_position_to_hilite = positions_to_hilite[position_to_hilite_idx].begin;

        chassert(current_position_to_hilite <= end);
        chassert(current_position_to_hilite >= begin);

        out.write(pos, current_position_to_hilite - pos);

        if (current_position_to_hilite == end)
        {
            out << "\033[41;1m \033[0m";
            return;
        }

        ssize_t bytes_to_hilite = std::min<ssize_t>(UTF8::seqLength(*current_position_to_hilite), end - current_position_to_hilite);

        /// Bright on red background.
        out << "\033[41;1m";
        out.write(current_position_to_hilite, bytes_to_hilite);
        out << "\033[0m";
        pos = current_position_to_hilite + bytes_to_hilite;
    }
    out.write(pos, end - pos);
}


void writeQueryAroundTheError(