151 lines
7.5 KiB
Protocol Buffer
151 lines
7.5 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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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: kenton@google.com (Kenton Varda)
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//
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// WARNING: The plugin interface is currently EXPERIMENTAL and is subject to
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// change.
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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 go_package = "plugin_go";
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import "google/protobuf/descriptor.proto";
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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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// 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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repeated FileDescriptorProto proto_file = 15;
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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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// 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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}
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repeated File file = 15;
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}
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