gistfile1.txt

void
basic_parser::
parse_null(char_stream& cs0)
{
    state st;
    detail::local_char_stream cs(cs0);
    if(BOOST_JSON_LIKELY(stk_.empty()))
    {
        BOOST_ASSERT(cs[0] == 'n');
        if(BOOST_JSON_LIKELY(cs.remain() >= 4))
        {
            if(BOOST_JSON_LIKELY(
                cs[1] == 'u' &&
                cs[2] == 'l' &&
                cs[3] == 'l'))
            {
                this->on_null(ec_);
                if(BOOST_JSON_LIKELY(! ec_))
                    cs.skip(4);
                return;
            }
            ec_ = error::expected_null;
            return;
        }
        cs.get();
        st = state::nul1;
    }
    else
    {
        stk_.pop(st);
    }
    char c;
    switch(st)
    {
    case state::nul1:
        c = cs.peek();
        if(c != 'u')
        {
            if(c != 0)
            {
                ec_ = error::expected_null;
                return;
            }
            stk_.push(state::nul1);
            ec_ = error::end_of_stream;
            return;
        }
        cs.get();
        BOOST_FALLTHROUGH;

    case state::nul2:
        c = cs.peek();
        if(c != 'l')
        {
            if(c != 0)
            {
                ec_ = error::expected_null;
                return;
            }
            stk_.push(state::nul2);
            ec_ = error::end_of_stream;
            return;
        }
        cs.get();
        BOOST_FALLTHROUGH;

    case state::nul3:
        c = cs.peek();
        if(c != 'l')
        {
            if(c != 0)
            {
                ec_ = error::expected_null;
                return;
            }
            stk_.push(state::nul3);
            ec_ = error::end_of_stream;
            return;
        }
        cs.get();
        break;
    }

    this->on_null(ec_);
}