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