Function get_token_string

Source/external/json.hpp:8749–8770

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{{}};
				static_cast<void>((std::snprintf)(cs.data(), cs.size(), "<U+%.4X>", static_cast<unsigned char>(c))); // NOLINT(cppcoreguidelines-pro-type-vararg,hicpp-vararg)
				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