inline bool JSON_Parser::handle_unescape_char()

in Include/json_cpp/details/json_parsing.hpp [707:774]

• 57 lines of code
• 13 McCabe index (conditional complexity)

inline bool JSON_Parser<CharType>::handle_unescape_char(Token &token)
{
    token.has_unescape_symbol = true;

    // This function converts unescaped character pairs (e.g. "\t") into their ASCII or Unicode representations (e.g. tab sign)
    // Also it handles \u + 4 hexadecimal digits
    auto ch = NextCharacter();
    switch (ch)
    {
        case '\"':
            token.string_val.push_back('\"');
            return true;
        case '\\':
            token.string_val.push_back('\\');
            return true;
        case '/':
            token.string_val.push_back('/');
            return true;
        case 'b':
            token.string_val.push_back('\b');
            return true;
        case 'f':
            token.string_val.push_back('\f');
            return true;
        case 'r':
            token.string_val.push_back('\r');
            return true;
        case 'n':
            token.string_val.push_back('\n');
            return true;
        case 't':
            token.string_val.push_back('\t');
            return true;
        case 'u':
        {
            // A four-hexdigit Unicode character.
            // Transform into a 16 bit code point.
            int decoded = 0;
            for (int i = 0; i < 4; ++i)
            {
                ch = NextCharacter();
                int ch_int = static_cast<int>(ch);
                if (ch_int < 0 || ch_int > 127)
                    return false;
#ifdef _WIN32
                const int isxdigitResult = _isxdigit_l(ch_int, utility::details::scoped_c_thread_locale::c_locale());
#else
                const int isxdigitResult = isxdigit(ch_int);
#endif
                if (!isxdigitResult)
                    return false;

                int val = _hexval[static_cast<size_t>(ch_int)];
                _ASSERTE(val != -1);

                // Add the input char to the decoded number
                decoded |= (val << (4 * (3 - i)));
            }

            // Construct the character based on the decoded number
			convert_append_unicode_code_unit(token, static_cast<utf16char>(decoded));

            return true;
        }
        default:
            return false;
    }
}