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#ifndef UPB_STDCPP_H_
#define UPB_STDCPP_H_
#include "upb/sink.h"
namespace upb {
template <class T>
class FillStringHandler {
public:
static void SetHandler(BytesHandler* handler) {
upb_byteshandler_setstartstr(handler, &FillStringHandler::StartString,
NULL);
upb_byteshandler_setstring(handler, &FillStringHandler::StringBuf, NULL);
}
private:
// TODO(haberman): add UpbBind/UpbMakeHandler support to BytesHandler so these
// can be prettier callbacks.
static void* StartString(void *c, const void *hd, size_t size) {
UPB_UNUSED(hd);
UPB_UNUSED(size);
T* str = static_cast<T*>(c);
str->clear();
return c;
}
static size_t StringBuf(void* c, const void* hd, const char* buf, size_t n,
const BufferHandle* h) {
UPB_UNUSED(hd);
UPB_UNUSED(h);
T* str = static_cast<T*>(c);
try {
str->append(buf, n);
return n;
} catch (const std::exception&) {
return 0;
}
}
};
class StringSink {
public:
template <class T>
explicit StringSink(T* target) {
// TODO(haberman): we need to avoid rebuilding a new handler every time,
// but with class globals disallowed for google3 C++ this is tricky.
FillStringHandler<T>::SetHandler(&handler_);
input_.Reset(&handler_, target);
}
BytesSink* input() { return &input_; }
private:
BytesHandler handler_;
BytesSink input_;
};
} // namespace upb
#endif // UPB_STDCPP_H_
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