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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, with the
* exception of built-in types (those defined in descriptor.proto). 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
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;
struct upb_msg *fd_msg; /* This is in symtab also, kept here for convenience. */
/* A list of the FileDescriptorProtos we own (from having parsed them
* ourselves) and must free on destruction. */
size_t fd_size, fd_len;
google_protobuf_FileDescriptorProto **fd;
};
/* 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);
INLINE struct upb_symtab_entry *upb_context_symbegin(struct upb_context *c) {
return upb_strtable_begin(&c->symtab);
}
INLINE struct upb_symtab_entry *upb_context_symnext(
struct upb_context *c, struct upb_inttable_entry *cur) {
return upb_strtable_next(&c->symtab, cur);
}
/* 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. */
bool upb_context_addfd(struct upb_context *c,
google_protobuf_FileDescriptorProto *fd);
/* Like the previous, but takes a serialized FileDescriptorProto and parses
* it before adding to the context. */
bool upb_context_parsefd(struct upb_context *c, struct upb_string *fd);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* UPB_PARSE_H_ */
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