1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
/*
* upb - a minimalist implementation of protocol buffers.
*
* A context represents a namespace of proto definitions, sort of like an
* interpreter's symbol table. It is mostly empty when first constructed.
* Clients add definitions to the context by supplying unserialized or
* serialized descriptors (as defined in descriptor.proto).
*
* Copyright (c) 2009 Joshua Haberman. See LICENSE for details.
*/
#ifndef UPB_CONTEXT_H_
#define UPB_CONTEXT_H_
#include "upb.h"
#include "upb_table.h"
#ifdef __cplusplus
extern "C" {
#endif
enum upb_symbol_type {
UPB_SYM_MESSAGE,
UPB_SYM_ENUM,
UPB_SYM_SERVICE,
UPB_SYM_EXTENSION
};
struct upb_symtab_entry {
struct upb_strtable_entry e;
enum upb_symbol_type type;
union {
struct upb_msg *msg;
struct upb_enum *_enum;
struct upb_svc *svc;
} p;
};
struct upb_context {
struct upb_strtable symtab;
};
/* Initializes and frees a upb_context, respectively. Newly initialized
* contexts will always have the types in descriptor.proto defined. */
bool upb_context_init(struct upb_context *c);
void upb_context_free(struct upb_context *c);
/* Looking up symbols. ********************************************************/
/* Nested type names are separated by periods. */
#define UPB_CONTEXT_SEPARATOR '.'
#define UPB_SYM_MAX_LENGTH 256
/* Resolves the given symbol using the rules described in descriptor.proto,
* namely:
*
* If the name starts with a '.', it is fully-qualified. Otherwise, C++-like
* scoping rules are used to find the type (i.e. first the nested types
* within this message are searched, then within the parent, on up to the
* root namespace).
*
* Returns NULL if the symbol has not been defined. */
struct upb_symtab_entry *upb_context_resolve(struct upb_context *c,
struct upb_string *base,
struct upb_string *symbol);
/* Find an entry in the symbol table with this exact name. Returns NULL if no
* such symbol name exists. */
struct upb_symtab_entry *upb_context_lookup(struct upb_context *c,
struct upb_string *symbol);
/* TODO: let the client enumerate the symbols. */
/* Adding symbols. ************************************************************/
/* Enum controlling what happens if a symbol is redefined. */
enum upb_onredef {
UPB_ONREDEF_REPLACE, /* Replace existing definition (must be same type). */
UPB_ONREDEF_KEEP, /* Keep existing definition, ignore new one. */
UPB_ONREDEF_ERROR /* Error on redefinition. */
};
/* Adds the definitions in the given file descriptor to this context. All
* types that are referenced from fd must have previously been defined (or be
* defined in fd). onredef controls the behavior in the case that fd attempts
* to define a type that is already defined.
*
* Caller retains ownership of fd, but the context will contain references to
* it, so it must outlive the context. */
bool upb_context_addfd(struct upb_context *c,
google_protobuf_FileDescriptorProto *fd,
int onredef);
/* Adds the serialized FileDescriptorSet proto contained in fdss to the context,
* and adds symbol table entries for all the objects defined therein. onredef
* controls the behavior in the case the fds attempts to define a type that is
* already defined.
*
* Returns true if the protobuf in fds was parsed successfully and all
* references were successfully resolved. If false is returned, the context is
* unmodified. */
bool upb_context_parsefds(struct upb_context *c, struct upb_string *fds,
int onredef);
/* Like the previous, but for a single FileDescriptorProto instead of a set. */
bool upb_context_parsefd(struct upb_context *c, struct upb_string *fds,
int onredef);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UPB_PARSE_H_ */
|
