--- /dev/null
+/*
+** upb::json::Printer
+**
+** Handlers that emit JSON according to a specific protobuf schema.
+*/
+
+#ifndef UPB_JSON_TYPED_PRINTER_H_
+#define UPB_JSON_TYPED_PRINTER_H_
+
+#include "upb/sink.h"
+
+#ifdef __cplusplus
+namespace upb {
+namespace json {
+class PrinterPtr;
+} /* namespace json */
+} /* namespace upb */
+#endif
+
+/* upb_json_printer ***********************************************************/
+
+#define UPB_JSON_PRINTER_SIZE 192
+
+struct upb_json_printer;
+typedef struct upb_json_printer upb_json_printer;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Native C API. */
+upb_json_printer *upb_json_printer_create(upb_arena *a, const upb_handlers *h,
+ upb_bytessink output);
+upb_sink upb_json_printer_input(upb_json_printer *p);
+const upb_handlers *upb_json_printer_newhandlers(const upb_msgdef *md,
+ bool preserve_fieldnames,
+ const void *owner);
+
+/* Lazily builds and caches handlers that will push encoded data to a bytessink.
+ * Any msgdef objects used with this object must outlive it. */
+upb_handlercache *upb_json_printer_newcache(bool preserve_proto_fieldnames);
+
+#ifdef __cplusplus
+} /* extern "C" */
+
+/* Prints an incoming stream of data to a BytesSink in JSON format. */
+class upb::json::PrinterPtr {
+ public:
+ PrinterPtr(upb_json_printer* ptr) : ptr_(ptr) {}
+
+ static PrinterPtr Create(Arena *arena, const upb::Handlers *handlers,
+ BytesSink output) {
+ return PrinterPtr(
+ upb_json_printer_create(arena->ptr(), handlers, output.sink()));
+ }
+
+ /* The input to the printer. */
+ Sink input() { return upb_json_printer_input(ptr_); }
+
+ static const size_t kSize = UPB_JSON_PRINTER_SIZE;
+
+ static HandlerCache NewCache(bool preserve_proto_fieldnames) {
+ return upb_json_printer_newcache(preserve_proto_fieldnames);
+ }
+
+ private:
+ upb_json_printer* ptr_;
+};
+
+#endif /* __cplusplus */
+
+#endif /* UPB_JSON_TYPED_PRINTER_H_ */