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/*
* 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 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"
struct google_protobuf_FileDescriptorProto;
#ifdef __cplusplus
extern "C" {
#endif
/* Definitions. ***************************************************************/
/* The symbol table maps names to various kinds of symbols. */
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 upb_symbol_ref ref;
};
struct upb_context {
struct upb_strtable symtab; /* The context's symbol table. */
struct upb_strtable psymtab; /* Private symbols, for internal use. */
struct upb_msg *fds_msg; /* This is in psymtab, ptr here for convenience. */
/* A list of the FileDescriptorProtos we own (from having parsed them
* ourselves) and must free on destruction. */
size_t fds_size, fds_len;
struct google_protobuf_FileDescriptorSet **fds;
};
/* Initializes and frees a upb_context, respectively. */
bool upb_context_init(struct upb_context *c);
void upb_context_free(struct upb_context *c);
/* Looking up symbols. ********************************************************/
/* 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);
INLINE struct upb_symtab_entry *upb_context_symbegin(struct upb_context *c) {
return (struct upb_symtab_entry*)upb_strtable_begin(&c->symtab);
}
INLINE struct upb_symtab_entry *upb_context_symnext(
struct upb_context *c, struct upb_symtab_entry *cur) {
return (struct upb_symtab_entry*)upb_strtable_next(&c->symtab, &cur->e);
}
/* Adding symbols. ************************************************************/
/* 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). fd may not attempt to define any names that are already
* defined in this context.
*
* Caller retains ownership of fd, but the context will contain references to
* it, so it must outlive the context.
*
* upb_context_addfd only returns true or false; it does not give any hint
* about what happened in the case of failure. This is because the descriptor
* is expected to have been validated at the time it was parsed/generated. */
bool upb_context_addfd(struct upb_context *c,
struct google_protobuf_FileDescriptorProto *fd);
bool upb_context_parsefds(struct upb_context *c, struct upb_string *fds);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UPB_PARSE_H_ */
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