Function writeWithEscapeCharacters

choc/text/choc_JSON.h:110–157

template <typename OutputStreamType>
void writeWithEscapeCharacters (OutputStreamType& out, text::UTF8Pointer source)
{
    auto writeUnicode = [] (OutputStreamType& o, auto digit)
    {
        auto hexDigit = [] (auto value) -> char { return "0123456789abcdef"[value & 15]; };

        o << "\\u" << hexDigit (digit >> 12) << hexDigit (digit >> 8) << hexDigit (digit >> 4) << hexDigit (digit);
    };

    for (;;)
    {
        auto c = *source;

        switch (c)
        {
            case 0:  return;

            case '\"':   out << "\\\""; break;
            case '\\':   out << "\\\\"; break;
            case '\n':   out << "\\n";  break;
            case '\r':   out << "\\r";  break;
            case '\t':   out << "\\t";  break;
            case '\a':   out << "\\a";  break;
            case '\b':   out << "\\b";  break;
            case '\f':   out << "\\f";  break;

            default:
                if (c > 31 && c < 127)
                {
                    out << (char) c;
                    break;
                }

                if (c >= 0x10000)
                {
                    auto pair = choc::text::splitCodePointIntoSurrogatePair (c);
                    writeUnicode (out, pair.high);
                    writeUnicode (out, pair.low);
                    break;
                }

                writeUnicode (out, c);
                break;
        }

        ++source;
    }
}

inline std::string addEscapeCharacters (text::UTF8Pointer source)
{