Class JSString

Dependencies/napi/source/js_native_api_JavaScriptCore.cc:20–103

namespace {
  class JSString {
   public:
    JSString(const JSString&) = delete;

    JSString(JSString&& other) {
      _string = other._string;
      other._string = nullptr;
    }

    JSString(const char* string, size_t length = NAPI_AUTO_LENGTH)
      : _string{JSStringCreateWithUTF8CString(length == NAPI_AUTO_LENGTH ? string : std::string(string, length).data())} {
    }

    JSString(const JSChar* string, size_t length = NAPI_AUTO_LENGTH)
      : _string{JSStringCreateWithCharacters(string, length == NAPI_AUTO_LENGTH ? std::char_traits<JSChar>::length(string) : length)} {
    }

    ~JSString() {
      if (_string != nullptr) {
        JSStringRelease(_string);
      }
    }

    static JSString Attach(JSStringRef string) {
      return {string};
    }

    operator JSStringRef() const {
      return _string;
    }

    size_t Length() const {
      return JSStringGetLength(_string);
    }

    size_t LengthUTF8() const {
      std::vector<char> buffer(JSStringGetMaximumUTF8CStringSize(_string));
      return JSStringGetUTF8CString(_string, buffer.data(), buffer.size()) - 1;
    }

    size_t LengthLatin1() const {
      // Latin1 has the same length as Unicode.
      return JSStringGetLength(_string);
    }

    void CopyTo(JSChar* buf, size_t bufsize, size_t* result) const {
      size_t length{JSStringGetLength(_string)};
      const JSChar* chars{JSStringGetCharactersPtr(_string)};
      size_t size{std::min(length, bufsize - 1)};
      std::memcpy(buf, chars, size);
      buf[size] = 0;
      if (result != nullptr) {
        *result = size;
      }
    }

    void CopyToUTF8(char* buf, size_t bufsize, size_t* result) const {
      size_t size{JSStringGetUTF8CString(_string, buf, bufsize)};