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POGenerate C# from proto files and vice versa interpreting custom options
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copied!<p>I'm using <a href="http://code.google.com/p/protobuf-net/" rel="nofollow">protobuf-net</a>, and I'm trying to:</p> <ol> <li>Generate a C# class from a .proto file </li> <li>Generate a .proto file from a C# class</li> </ol> <p>That's pretty easy using respectively:</p> <ol> <li><code>protogen.exe</code> tool</li> <li><code>Serializer<T>.GetProto()</code> method</li> </ol> <p>But the thing is that I need to support protobuffer <a href="http://code.google.com/apis/protocolbuffers/docs/proto.html#options" rel="nofollow">custom options</a> and it doesn't seem to be as straightforward as I though.</p> <p>Let me explain:</p> <ol> <li>From a proto file containing custom options applied on messages and fields, I want to generate a C# class decorated by .NET custom attributes.</li> <li>From a C# class decorated by custom attributes, I would like to generate a proto file where custom options are applied on messages and fields.</li> </ol> <p>Basically, given:</p> <pre><code>message person { option (my_message_option) = true; optional string firstname = 1 [(my_field_option) = 42]; optional string lastname = 2 [(my_field_option) = 12]; optional int age = 3; } </code></pre> <p>I want to generate:</p> <pre><code>[ProtoContract, MyMessageOption(true)] public class Person { [ProtoMember(1), MyFieldOption(42)] public string Firstname; [ProtoMember(2), MyFieldOption(12)] public string Firstname; [ProtoMember(3)] public string Firstname; } </code></pre> <p>...and vice versa.</p> <p>Notes : </p> <ul> <li>The custom option definitions (<code>my_message_option</code> and <code>my_field_option</code>) can already exist in a protofile (say, my_custom_options.proto), and the custom attributes classes can also exist somewhere (<code>MyMessageOptionAttribute</code> and <code>MyFieldOptionAttribute</code>).</li> <li>I tried to use protogen.exe and a custom xslt but protogen doesn't seem to have support for custom options.</li> </ul> <p>What's the preferred way to achieve that? <strong>The solution doesn't have to rely on protobuf-net.</strong></p>

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