181 lines
8.4 KiB
Protocol Buffer
181 lines
8.4 KiB
Protocol Buffer
// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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// Author: kenton@google.com (Kenton Varda)
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//
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// protoc (aka the Protocol Compiler) can be extended via plugins. A plugin is
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// just a program that reads a CodeGeneratorRequest from stdin and writes a
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// CodeGeneratorResponse to stdout.
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//
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// Plugins written using C++ can use google/protobuf/compiler/plugin.h instead
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// of dealing with the raw protocol defined here.
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//
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// A plugin executable needs only to be placed somewhere in the path. The
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// plugin should be named "protoc-gen-$NAME", and will then be used when the
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// flag "--${NAME}_out" is passed to protoc.
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syntax = "proto2";
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package google.protobuf.compiler;
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option java_package = "com.google.protobuf.compiler";
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option java_outer_classname = "PluginProtos";
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option csharp_namespace = "Google.Protobuf.Compiler";
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option go_package = "google.golang.org/protobuf/types/pluginpb";
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import "google/protobuf/descriptor.proto";
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// The version number of protocol compiler.
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message Version {
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optional int32 major = 1;
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optional int32 minor = 2;
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optional int32 patch = 3;
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// A suffix for alpha, beta or rc release, e.g., "alpha-1", "rc2". It should
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// be empty for mainline stable releases.
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optional string suffix = 4;
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}
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// An encoded CodeGeneratorRequest is written to the plugin's stdin.
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message CodeGeneratorRequest {
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// The .proto files that were explicitly listed on the command-line. The
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// code generator should generate code only for these files. Each file's
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// descriptor will be included in proto_file, below.
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repeated string file_to_generate = 1;
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// The generator parameter passed on the command-line.
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optional string parameter = 2;
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// FileDescriptorProtos for all files in files_to_generate and everything
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// they import. The files will appear in topological order, so each file
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// appears before any file that imports it.
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//
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// Note: the files listed in files_to_generate will include runtime-retention
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// options only, but all other files will include source-retention options.
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// The source_file_descriptors field below is available in case you need
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// source-retention options for files_to_generate.
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//
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// protoc guarantees that all proto_files will be written after
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// the fields above, even though this is not technically guaranteed by the
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// protobuf wire format. This theoretically could allow a plugin to stream
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// in the FileDescriptorProtos and handle them one by one rather than read
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// the entire set into memory at once. However, as of this writing, this
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// is not similarly optimized on protoc's end -- it will store all fields in
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// memory at once before sending them to the plugin.
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//
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// Type names of fields and extensions in the FileDescriptorProto are always
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// fully qualified.
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repeated FileDescriptorProto proto_file = 15;
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// File descriptors with all options, including source-retention options.
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// These descriptors are only provided for the files listed in
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// files_to_generate.
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repeated FileDescriptorProto source_file_descriptors = 17;
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// The version number of protocol compiler.
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optional Version compiler_version = 3;
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}
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// The plugin writes an encoded CodeGeneratorResponse to stdout.
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message CodeGeneratorResponse {
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// Error message. If non-empty, code generation failed. The plugin process
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// should exit with status code zero even if it reports an error in this way.
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//
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// This should be used to indicate errors in .proto files which prevent the
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// code generator from generating correct code. Errors which indicate a
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// problem in protoc itself -- such as the input CodeGeneratorRequest being
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// unparseable -- should be reported by writing a message to stderr and
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// exiting with a non-zero status code.
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optional string error = 1;
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// A bitmask of supported features that the code generator supports.
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// This is a bitwise "or" of values from the Feature enum.
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optional uint64 supported_features = 2;
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// Sync with code_generator.h.
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enum Feature {
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FEATURE_NONE = 0;
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FEATURE_PROTO3_OPTIONAL = 1;
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FEATURE_SUPPORTS_EDITIONS = 2;
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}
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// The minimum edition this plugin supports. This will be treated as an
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// Edition enum, but we want to allow unknown values. It should be specified
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// according the edition enum value, *not* the edition number. Only takes
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// effect for plugins that have FEATURE_SUPPORTS_EDITIONS set.
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optional int32 minimum_edition = 3;
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// The maximum edition this plugin supports. This will be treated as an
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// Edition enum, but we want to allow unknown values. It should be specified
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// according the edition enum value, *not* the edition number. Only takes
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// effect for plugins that have FEATURE_SUPPORTS_EDITIONS set.
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optional int32 maximum_edition = 4;
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// Represents a single generated file.
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message File {
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// The file name, relative to the output directory. The name must not
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// contain "." or ".." components and must be relative, not be absolute (so,
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// the file cannot lie outside the output directory). "/" must be used as
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// the path separator, not "\".
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//
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// If the name is omitted, the content will be appended to the previous
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// file. This allows the generator to break large files into small chunks,
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// and allows the generated text to be streamed back to protoc so that large
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// files need not reside completely in memory at one time. Note that as of
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// this writing protoc does not optimize for this -- it will read the entire
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// CodeGeneratorResponse before writing files to disk.
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optional string name = 1;
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// If non-empty, indicates that the named file should already exist, and the
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// content here is to be inserted into that file at a defined insertion
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// point. This feature allows a code generator to extend the output
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// produced by another code generator. The original generator may provide
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// insertion points by placing special annotations in the file that look
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// like:
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// @@protoc_insertion_point(NAME)
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// The annotation can have arbitrary text before and after it on the line,
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// which allows it to be placed in a comment. NAME should be replaced with
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// an identifier naming the point -- this is what other generators will use
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// as the insertion_point. Code inserted at this point will be placed
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// immediately above the line containing the insertion point (thus multiple
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// insertions to the same point will come out in the order they were added).
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// The double-@ is intended to make it unlikely that the generated code
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// could contain things that look like insertion points by accident.
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//
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// For example, the C++ code generator places the following line in the
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// .pb.h files that it generates:
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// // @@protoc_insertion_point(namespace_scope)
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// This line appears within the scope of the file's package namespace, but
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// outside of any particular class. Another plugin can then specify the
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// insertion_point "namespace_scope" to generate additional classes or
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// other declarations that should be placed in this scope.
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//
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// Note that if the line containing the insertion point begins with
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// whitespace, the same whitespace will be added to every line of the
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// inserted text. This is useful for languages like Python, where
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// indentation matters. In these languages, the insertion point comment
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// should be indented the same amount as any inserted code will need to be
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// in order to work correctly in that context.
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//
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// The code generator that generates the initial file and the one which
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// inserts into it must both run as part of a single invocation of protoc.
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// Code generators are executed in the order in which they appear on the
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// command line.
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//
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// If |insertion_point| is present, |name| must also be present.
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optional string insertion_point = 2;
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// The file contents.
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optional string content = 15;
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// Information describing the file content being inserted. If an insertion
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// point is used, this information will be appropriately offset and inserted
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// into the code generation metadata for the generated files.
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optional GeneratedCodeInfo generated_code_info = 16;
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}
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repeated File file = 15;
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}
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