Roslyn Code Generator for MonoBehaviours

Brainshack · May 28, 2024, 8:13pm

Hi!

I am currently trying out Roslyn Code Generators and am currently working on something harkening back to the good old Times of GenerateAuthoringComponent in older ECS Versions. However I seem to have run into somewhat of a roadblock, when it comes to generate the Authroring Behaviours.

My Code Generator seems to work fine. When I inspect the Solution in Rider, the Authoring file is there and has no compilation errors. But I cannot add it as a Component to a GameObject. I also compared my generated code to some old sample code from the Entities 0.17 days with the GenerateAuthoringComponent Generator. I was hoping maybe to be able to browse old Entities code, but it doesnt seem to be publicly available? I probably need to do something special for unity to recognize my Generated Behaviour as a component, but my searches so far only have lead to some old unresolved threads. That’s why I started this thread in hope someone from the Unity Team could share some wisdom about Roslyn Code Generators. I am using an Incremental Code Generator. The whole code is on github. Here is a link to the specific Generator in Question:

github.com

Brainshack/generateauthoring/blob/master/SourceGen~/SourceGenerator/SourceGenerator/SourceGenerator/AuthoringCodeGenerator.cs

using System.Collections.Immutable;
using System.Linq;
using System.Text;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Text;

namespace SourceGenerator;

[Generator]
public class AuthoringCodeGenerator: IIncrementalGenerator
{
    private string _attributeSourceCode = @"// <auto-generated/>

namespace Generators
{
    [System.AttributeUsage(System.AttributeTargets.Struct)]
    internal class GenerateAuthoringAttribute : System.Attribute
    {
    }

This file has been truncated. show original

WAYNGames · May 29, 2024, 6:20am

Why is your generated class internal on line 72 ?

Laicasaane · May 30, 2024, 6:33am

It is, if you know where to look for
https://github.com/needle-mirror/com.unity.entities/commit/d82a3289fef3f803d95412161e81fd3da125783d

However, iirc, at that time they didn’t use source generator but IL weaving through cecil.

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Roslyn Code Generator for MonoBehaviours

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