Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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90 lines
3.2 KiB
90 lines
3.2 KiB
/* |
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* upb - a minimalist implementation of protocol buffers. |
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* |
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* A context represents a namespace of proto definitions, sort of like an |
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* interpreter's symbol table. It is empty when first constructed, with the |
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* exception of built-in types (those defined in descriptor.proto). Clients |
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* add definitions to the context by supplying unserialized or serialized |
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* descriptors (as defined in descriptor.proto). |
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* |
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* Copyright (c) 2009 Joshua Haberman. See LICENSE for details. |
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*/ |
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#ifndef UPB_CONTEXT_H_ |
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#define UPB_CONTEXT_H_ |
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#include "upb.h" |
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#include "upb_table.h" |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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struct upb_symtab_entry { |
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struct upb_strtable_entry e; |
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enum upb_symbol_type type; |
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union upb_symbol_ref ref; |
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}; |
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struct upb_context { |
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struct upb_strtable symtab; |
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struct upb_msg *fd_msg; /* This is in symtab also, kept here for convenience. */ |
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/* A list of the FileDescriptorProtos we own (from having parsed them |
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* ourselves) and must free on destruction. */ |
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size_t fd_size, fd_len; |
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google_protobuf_FileDescriptorProto **fd; |
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}; |
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/* Initializes and frees a upb_context, respectively. Newly initialized |
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* contexts will always have the types in descriptor.proto defined. */ |
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bool upb_context_init(struct upb_context *c); |
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void upb_context_free(struct upb_context *c); |
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/* Looking up symbols. ********************************************************/ |
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/* Nested type names are separated by periods. */ |
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#define UPB_CONTEXT_SEPARATOR '.' |
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#define UPB_SYM_MAX_LENGTH 256 |
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/* Resolves the given symbol using the rules described in descriptor.proto, |
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* namely: |
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* |
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* If the name starts with a '.', it is fully-qualified. Otherwise, C++-like |
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* scoping rules are used to find the type (i.e. first the nested types |
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* within this message are searched, then within the parent, on up to the |
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* root namespace). |
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* |
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* Returns NULL if the symbol has not been defined. */ |
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struct upb_symtab_entry *upb_context_resolve(struct upb_context *c, |
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struct upb_string *base, |
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struct upb_string *symbol); |
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/* Find an entry in the symbol table with this exact name. Returns NULL if no |
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* such symbol name exists. */ |
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struct upb_symtab_entry *upb_context_lookup(struct upb_context *c, |
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struct upb_string *symbol); |
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/* TODO: let the client enumerate the symbols. */ |
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/* Adding symbols. ************************************************************/ |
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/* Adds the definitions in the given file descriptor to this context. All |
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* types that are referenced from fd must have previously been defined (or be |
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* defined in fd). fd may not attempt to define any names that are already |
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* defined in this context. |
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* |
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* Caller retains ownership of fd, but the context will contain references to |
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* it, so it must outlive the context. */ |
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bool upb_context_addfd(struct upb_context *c, |
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google_protobuf_FileDescriptorProto *fd); |
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/* Like the previous, but takes a serialized FileDescriptorProto and parses |
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* it before adding to the context. */ |
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bool upb_context_parsefd(struct upb_context *c, struct upb_string *fd); |
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#ifdef __cplusplus |
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} /* extern "C" */ |
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#endif |
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#endif /* UPB_PARSE_H_ */
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