Function get_token_string

Source/Utils/json.hpp:7319–7340

return the last read token (for errors only). Will never contain EOF (an arbitrary value that is not a valid char value, often -1), because 255 may legitimately occur. May contain NUL, which should be escaped.

            /// (an arbitrary value that is not a valid char value, often -1), because
            /// 255 may legitimately occur.  May contain NUL, which should be escaped.
            std::string get_token_string() const
            {
                // escape control characters
                std::string result;
                for (const auto c : token_string)
                {
                    if (static_cast<unsigned char>(c) <= '\x1F')
                    {
                        // escape control characters
                        std::array<char, 9> cs{ {} };
                        (std::snprintf)(cs.data(), cs.size(), "<U+%.4X>", static_cast<unsigned char>(c));
                        result += cs.data();
                    }
                    else
                    {
                        // add character as is
                        result.push_back(static_cast<std::string::value_type>(c));
                    }
                }

                return result;
            }

            /// return syntax error message
            JSON_HEDLEY_RETURNS_NON_NULL