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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2011 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*
* upb::descriptor::Reader provides a way of building upb::Defs from
* data in descriptor.proto format.
*/
#ifndef UPB_DESCRIPTOR_H
#define UPB_DESCRIPTOR_H
#include "upb/env.h"
#include "upb/sink.h"
#ifdef __cplusplus
namespace upb {
namespace descriptor {
class Reader;
} // namespace descriptor
} // namespace upb
#endif
UPB_DECLARE_TYPE(upb::descriptor::Reader, upb_descreader);
#ifdef __cplusplus
// Class that receives descriptor data according to the descriptor.proto schema
// and use it to build upb::Defs corresponding to that schema.
class upb::descriptor::Reader {
public:
// These handlers must have come from NewHandlers() and must outlive the
// Reader.
//
// TODO: generate the handlers statically (like we do with the
// descriptor.proto defs) so that there is no need to pass this parameter (or
// to build/memory-manage the handlers at runtime at all). Unfortunately this
// is a bit tricky to implement for Handlers, but necessary to simplify this
// interface.
static Reader* Create(Environment* env, const Handlers* handlers);
// The reader's input; this is where descriptor.proto data should be sent.
Sink* input();
// Returns an array of all defs that have been parsed, and transfers ownership
// of them to "owner". The number of defs is stored in *n. Ownership of the
// returned array is retained and is invalidated by any other call into
// Reader.
//
// These defs are not frozen or resolved; they are ready to be added to a
// symtab.
upb::Def** GetDefs(void* owner, int* n);
// Builds and returns handlers for the reader, owned by "owner."
static Handlers* NewHandlers(const void* owner);
private:
UPB_DISALLOW_POD_OPS(Reader, upb::descriptor::Reader);
};
#endif
UPB_BEGIN_EXTERN_C
// C API.
upb_descreader *upb_descreader_create(upb_env *e, const upb_handlers *h);
upb_sink *upb_descreader_input(upb_descreader *r);
upb_def **upb_descreader_getdefs(upb_descreader *r, void *owner, int *n);
const upb_handlers *upb_descreader_newhandlers(const void *owner);
UPB_END_EXTERN_C
#ifdef __cplusplus
// C++ implementation details. /////////////////////////////////////////////////
namespace upb {
namespace descriptor {
inline Reader* Reader::Create(Environment* e, const Handlers *h) {
return upb_descreader_create(e, h);
}
inline Sink* Reader::input() { return upb_descreader_input(this); }
inline upb::Def** Reader::GetDefs(void* owner, int* n) {
return upb_descreader_getdefs(this, owner, n);
}
} // namespace descriptor
} // namespace upb
#endif
#endif // UPB_DESCRIPTOR_H
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