Function countCodePointsWithSeqLength

src/Client/ClientBaseHelpers.cpp:146–156

Issue: https://github.com/ClickHouse/ClickHouse/issues/83987 countCodePointsWithSeqLength calculates utf-8 code point position consistently with colors vector allocation (with iteration and `UTF8::seqLength`). This function replaces the use of `UTF8::countCodePoints()`, since, `UTF8::countCodePoints` and `UTF8::seqLength` seem to handle invalid utf-8 sequences inconsistently (e.g., hex literals li

/// and crashes. TODO: @bharatnc fix `UTF8::countCodePoints` to handle invalid utf-8 sequences consistently
/// with `UTF8::seqLength` so that this helper function's usage can be removed.
static size_t countCodePointsWithSeqLength(const String & query, const char * end)
{
    size_t code_points = 0;
    const char * pos = query.data();
    while (pos < end)
    {
        pos += UTF8::seqLength(*pos);
        ++code_points;
    }
    return code_points;
}

void highlight(const String & query, std::vector<replxx::Replxx::Color> & colors, const Context & context, int cursor_position, bool rainbow_parentheses)
{