/*
** Defs are upb's internal representation of the constructs that can appear
** in a .proto file:
**
** - upb_msgdef: describes a "message" construct.
** - upb_fielddef: describes a message field.
** - upb_filedef: describes a .proto file and its defs.
** - upb_enumdef: describes an enum.
** - upb_oneofdef: describes a oneof.
**
** TODO: definitions of services.
*/

#ifndef UPB_DEF_H_
#define UPB_DEF_H_

#include "upb/upb.h"
#include "upb/table.int.h"
#include "google/protobuf/descriptor.upb.h"

#include "upb/port_def.inc"

#ifdef __cplusplus
extern "C" {
#endif  /* __cplusplus */

struct upb_enumdef;
typedef struct upb_enumdef upb_enumdef;
struct upb_fielddef;
typedef struct upb_fielddef upb_fielddef;
struct upb_filedef;
typedef struct upb_filedef upb_filedef;
struct upb_msgdef;
typedef struct upb_msgdef upb_msgdef;
struct upb_oneofdef;
typedef struct upb_oneofdef upb_oneofdef;
struct upb_symtab;
typedef struct upb_symtab upb_symtab;

typedef enum {
  UPB_SYNTAX_PROTO2 = 2,
  UPB_SYNTAX_PROTO3 = 3
} upb_syntax_t;

/* All the different kind of well known type messages. For simplicity of check,
 * number wrappers and string wrappers are grouped together. Make sure the
 * order and merber of these groups are not changed.
 */
typedef enum {
  UPB_WELLKNOWN_UNSPECIFIED,
  UPB_WELLKNOWN_ANY,
  UPB_WELLKNOWN_FIELDMASK,
  UPB_WELLKNOWN_DURATION,
  UPB_WELLKNOWN_TIMESTAMP,
  /* number wrappers */
  UPB_WELLKNOWN_DOUBLEVALUE,
  UPB_WELLKNOWN_FLOATVALUE,
  UPB_WELLKNOWN_INT64VALUE,
  UPB_WELLKNOWN_UINT64VALUE,
  UPB_WELLKNOWN_INT32VALUE,
  UPB_WELLKNOWN_UINT32VALUE,
  /* string wrappers */
  UPB_WELLKNOWN_STRINGVALUE,
  UPB_WELLKNOWN_BYTESVALUE,
  UPB_WELLKNOWN_BOOLVALUE,
  UPB_WELLKNOWN_VALUE,
  UPB_WELLKNOWN_LISTVALUE,
  UPB_WELLKNOWN_STRUCT
} upb_wellknowntype_t;

/* upb_fielddef ***************************************************************/

/* Maximum field number allowed for FieldDefs.  This is an inherent limit of the
 * protobuf wire format. */
#define UPB_MAX_FIELDNUMBER ((1 << 29) - 1)

const char *upb_fielddef_fullname(const upb_fielddef *f);
upb_fieldtype_t upb_fielddef_type(const upb_fielddef *f);
upb_descriptortype_t upb_fielddef_descriptortype(const upb_fielddef *f);
upb_label_t upb_fielddef_label(const upb_fielddef *f);
uint32_t upb_fielddef_number(const upb_fielddef *f);
const char *upb_fielddef_name(const upb_fielddef *f);
const char *upb_fielddef_jsonname(const upb_fielddef *f);
bool upb_fielddef_isextension(const upb_fielddef *f);
bool upb_fielddef_lazy(const upb_fielddef *f);
bool upb_fielddef_packed(const upb_fielddef *f);
const upb_filedef *upb_fielddef_file(const upb_fielddef *f);
const upb_msgdef *upb_fielddef_containingtype(const upb_fielddef *f);
const upb_oneofdef *upb_fielddef_containingoneof(const upb_fielddef *f);
const upb_oneofdef *upb_fielddef_realcontainingoneof(const upb_fielddef *f);
uint32_t upb_fielddef_index(const upb_fielddef *f);
bool upb_fielddef_issubmsg(const upb_fielddef *f);
bool upb_fielddef_isstring(const upb_fielddef *f);
bool upb_fielddef_isseq(const upb_fielddef *f);
bool upb_fielddef_isprimitive(const upb_fielddef *f);
bool upb_fielddef_ismap(const upb_fielddef *f);
int64_t upb_fielddef_defaultint64(const upb_fielddef *f);
int32_t upb_fielddef_defaultint32(const upb_fielddef *f);
uint64_t upb_fielddef_defaultuint64(const upb_fielddef *f);
uint32_t upb_fielddef_defaultuint32(const upb_fielddef *f);
bool upb_fielddef_defaultbool(const upb_fielddef *f);
float upb_fielddef_defaultfloat(const upb_fielddef *f);
double upb_fielddef_defaultdouble(const upb_fielddef *f);
const char *upb_fielddef_defaultstr(const upb_fielddef *f, size_t *len);
bool upb_fielddef_hassubdef(const upb_fielddef *f);
bool upb_fielddef_haspresence(const upb_fielddef *f);
const upb_msgdef *upb_fielddef_msgsubdef(const upb_fielddef *f);
const upb_enumdef *upb_fielddef_enumsubdef(const upb_fielddef *f);
const upb_msglayout_field *upb_fielddef_layout(const upb_fielddef *f);

/* Internal only. */
uint32_t upb_fielddef_selectorbase(const upb_fielddef *f);

/* upb_oneofdef ***************************************************************/

typedef upb_inttable_iter upb_oneof_iter;

const char *upb_oneofdef_name(const upb_oneofdef *o);
const upb_msgdef *upb_oneofdef_containingtype(const upb_oneofdef *o);
int upb_oneofdef_numfields(const upb_oneofdef *o);
uint32_t upb_oneofdef_index(const upb_oneofdef *o);
bool upb_oneofdef_issynthetic(const upb_oneofdef *o);

/* Oneof lookups:
 * - ntof:  look up a field by name.
 * - ntofz: look up a field by name (as a null-terminated string).
 * - itof:  look up a field by number. */
const upb_fielddef *upb_oneofdef_ntof(const upb_oneofdef *o,
                                      const char *name, size_t length);
UPB_INLINE const upb_fielddef *upb_oneofdef_ntofz(const upb_oneofdef *o,
                                                  const char *name) {
  return upb_oneofdef_ntof(o, name, strlen(name));
}
const upb_fielddef *upb_oneofdef_itof(const upb_oneofdef *o, uint32_t num);

/*  upb_oneof_iter i;
 *  for(upb_oneof_begin(&i, e); !upb_oneof_done(&i); upb_oneof_next(&i)) {
 *    // ...
 *  }
 */
void upb_oneof_begin(upb_oneof_iter *iter, const upb_oneofdef *o);
void upb_oneof_next(upb_oneof_iter *iter);
bool upb_oneof_done(upb_oneof_iter *iter);
upb_fielddef *upb_oneof_iter_field(const upb_oneof_iter *iter);
void upb_oneof_iter_setdone(upb_oneof_iter *iter);
bool upb_oneof_iter_isequal(const upb_oneof_iter *iter1,
                            const upb_oneof_iter *iter2);

/* upb_msgdef *****************************************************************/

typedef upb_inttable_iter upb_msg_field_iter;
typedef upb_strtable_iter upb_msg_oneof_iter;

/* Well-known field tag numbers for map-entry messages. */
#define UPB_MAPENTRY_KEY   1
#define UPB_MAPENTRY_VALUE 2

/* Well-known field tag numbers for Any messages. */
#define UPB_ANY_TYPE 1
#define UPB_ANY_VALUE 2

/* Well-known field tag numbers for timestamp messages. */
#define UPB_DURATION_SECONDS 1
#define UPB_DURATION_NANOS 2

/* Well-known field tag numbers for duration messages. */
#define UPB_TIMESTAMP_SECONDS 1
#define UPB_TIMESTAMP_NANOS 2

const char *upb_msgdef_fullname(const upb_msgdef *m);
const upb_filedef *upb_msgdef_file(const upb_msgdef *m);
const char *upb_msgdef_name(const upb_msgdef *m);
int upb_msgdef_numfields(const upb_msgdef *m);
int upb_msgdef_numoneofs(const upb_msgdef *m);
int upb_msgdef_numrealoneofs(const upb_msgdef *m);
upb_syntax_t upb_msgdef_syntax(const upb_msgdef *m);
bool upb_msgdef_mapentry(const upb_msgdef *m);
upb_wellknowntype_t upb_msgdef_wellknowntype(const upb_msgdef *m);
bool upb_msgdef_iswrapper(const upb_msgdef *m);
bool upb_msgdef_isnumberwrapper(const upb_msgdef *m);
const upb_fielddef *upb_msgdef_itof(const upb_msgdef *m, uint32_t i);
const upb_fielddef *upb_msgdef_ntof(const upb_msgdef *m, const char *name,
                                    size_t len);
const upb_oneofdef *upb_msgdef_ntoo(const upb_msgdef *m, const char *name,
                                    size_t len);
const upb_msglayout *upb_msgdef_layout(const upb_msgdef *m);
const upb_fielddef *_upb_msgdef_field(const upb_msgdef *m, int i);

UPB_INLINE const upb_oneofdef *upb_msgdef_ntooz(const upb_msgdef *m,
                                               const char *name) {
  return upb_msgdef_ntoo(m, name, strlen(name));
}

UPB_INLINE const upb_fielddef *upb_msgdef_ntofz(const upb_msgdef *m,
                                                const char *name) {
  return upb_msgdef_ntof(m, name, strlen(name));
}

/* Internal-only. */
size_t upb_msgdef_selectorcount(const upb_msgdef *m);
uint32_t upb_msgdef_submsgfieldcount(const upb_msgdef *m);

/* Lookup of either field or oneof by name.  Returns whether either was found.
 * If the return is true, then the found def will be set, and the non-found
 * one set to NULL. */
bool upb_msgdef_lookupname(const upb_msgdef *m, const char *name, size_t len,
                           const upb_fielddef **f, const upb_oneofdef **o);

UPB_INLINE bool upb_msgdef_lookupnamez(const upb_msgdef *m, const char *name,
                                       const upb_fielddef **f,
                                       const upb_oneofdef **o) {
  return upb_msgdef_lookupname(m, name, strlen(name), f, o);
}

/* Returns a field by either JSON name or regular proto name. */
const upb_fielddef *upb_msgdef_lookupjsonname(const upb_msgdef *m,
                                              const char *name, size_t len);

/* Iteration over fields and oneofs.  For example:
 *
 * upb_msg_field_iter i;
 * for(upb_msg_field_begin(&i, m);
 *     !upb_msg_field_done(&i);
 *     upb_msg_field_next(&i)) {
 *   upb_fielddef *f = upb_msg_iter_field(&i);
 *   // ...
 * }
 *
 * For C we don't have separate iterators for const and non-const.
 * It is the caller's responsibility to cast the upb_fielddef* to
 * const if the upb_msgdef* is const. */
void upb_msg_field_begin(upb_msg_field_iter *iter, const upb_msgdef *m);
void upb_msg_field_next(upb_msg_field_iter *iter);
bool upb_msg_field_done(const upb_msg_field_iter *iter);
upb_fielddef *upb_msg_iter_field(const upb_msg_field_iter *iter);
void upb_msg_field_iter_setdone(upb_msg_field_iter *iter);
bool upb_msg_field_iter_isequal(const upb_msg_field_iter * iter1,
                                const upb_msg_field_iter * iter2);

/* Similar to above, we also support iterating through the oneofs in a
 * msgdef. */
void upb_msg_oneof_begin(upb_msg_oneof_iter * iter, const upb_msgdef *m);
void upb_msg_oneof_next(upb_msg_oneof_iter * iter);
bool upb_msg_oneof_done(const upb_msg_oneof_iter *iter);
const upb_oneofdef *upb_msg_iter_oneof(const upb_msg_oneof_iter *iter);
void upb_msg_oneof_iter_setdone(upb_msg_oneof_iter * iter);
bool upb_msg_oneof_iter_isequal(const upb_msg_oneof_iter *iter1,
                                const upb_msg_oneof_iter *iter2);

/* upb_enumdef ****************************************************************/

typedef upb_strtable_iter upb_enum_iter;

const char *upb_enumdef_fullname(const upb_enumdef *e);
const char *upb_enumdef_name(const upb_enumdef *e);
const upb_filedef *upb_enumdef_file(const upb_enumdef *e);
int32_t upb_enumdef_default(const upb_enumdef *e);
int upb_enumdef_numvals(const upb_enumdef *e);

/* Enum lookups:
 * - ntoi:  look up a name with specified length.
 * - ntoiz: look up a name provided as a null-terminated string.
 * - iton:  look up an integer, returning the name as a null-terminated
 *          string. */
bool upb_enumdef_ntoi(const upb_enumdef *e, const char *name, size_t len,
                      int32_t *num);
UPB_INLINE bool upb_enumdef_ntoiz(const upb_enumdef *e,
                                  const char *name, int32_t *num) {
  return upb_enumdef_ntoi(e, name, strlen(name), num);
}
const char *upb_enumdef_iton(const upb_enumdef *e, int32_t num);

/*  upb_enum_iter i;
 *  for(upb_enum_begin(&i, e); !upb_enum_done(&i); upb_enum_next(&i)) {
 *    // ...
 *  }
 */
void upb_enum_begin(upb_enum_iter *iter, const upb_enumdef *e);
void upb_enum_next(upb_enum_iter *iter);
bool upb_enum_done(upb_enum_iter *iter);
const char *upb_enum_iter_name(upb_enum_iter *iter);
int32_t upb_enum_iter_number(upb_enum_iter *iter);

/* upb_filedef ****************************************************************/

const char *upb_filedef_name(const upb_filedef *f);
const char *upb_filedef_package(const upb_filedef *f);
const char *upb_filedef_phpprefix(const upb_filedef *f);
const char *upb_filedef_phpnamespace(const upb_filedef *f);
upb_syntax_t upb_filedef_syntax(const upb_filedef *f);
int upb_filedef_depcount(const upb_filedef *f);
int upb_filedef_msgcount(const upb_filedef *f);
int upb_filedef_enumcount(const upb_filedef *f);
const upb_filedef *upb_filedef_dep(const upb_filedef *f, int i);
const upb_msgdef *upb_filedef_msg(const upb_filedef *f, int i);
const upb_enumdef *upb_filedef_enum(const upb_filedef *f, int i);

/* upb_symtab *****************************************************************/

upb_symtab *upb_symtab_new(void);
void upb_symtab_free(upb_symtab* s);
const upb_msgdef *upb_symtab_lookupmsg(const upb_symtab *s, const char *sym);
const upb_msgdef *upb_symtab_lookupmsg2(
    const upb_symtab *s, const char *sym, size_t len);
const upb_enumdef *upb_symtab_lookupenum(const upb_symtab *s, const char *sym);
const upb_filedef *upb_symtab_lookupfile(const upb_symtab *s, const char *name);
const upb_filedef *upb_symtab_lookupfile2(
    const upb_symtab *s, const char *name, size_t len);
int upb_symtab_filecount(const upb_symtab *s);
const upb_filedef *upb_symtab_addfile(
    upb_symtab *s, const google_protobuf_FileDescriptorProto *file,
    upb_status *status);

/* For generated code only: loads a generated descriptor. */
typedef struct upb_def_init {
  struct upb_def_init **deps;     /* Dependencies of this file. */
  const upb_msglayout **layouts;  /* Pre-order layouts of all messages. */
  const char *filename;
  upb_strview descriptor;         /* Serialized descriptor. */
} upb_def_init;

bool _upb_symtab_loaddefinit(upb_symtab *s, const upb_def_init *init);

#include "upb/port_undef.inc"

#ifdef __cplusplus
}  /* extern "C" */
#endif  /* __cplusplus */

#endif /* UPB_DEF_H_ */