io.extendreality.malimbe

Malimbe

A collection of tools to simplify writing public API components for the Unity software.

Introduction

Malimbe for the Unity software aims to reduce repetitive boilerplate code by taking the assemblies that are created by build tools and changing the assembly itself, new functionality can be introduced and logic written as part of the source code can be altered. This process is called Intermediate Language (IL) weaving and Malimbe uses Fody to do it.

Malimbe helps running Fody and Fody addins without MSBuild or Visual Studio and additionally offers running them inside the Unity software by integrating with the Unity software compilation and build pipeline. Multiple weavers come with Malimbe to help with boilerplate one has to write when creating Unity software components that are intended for public consumption. This includes a form of "serialized properties", getting rid of duplicated documentation through XML documentation and the [Tooltip] attribute as well as weavers that help with ensuring the API is able to be called from UnityEvents and more.

Releases

Branch	Version	Explanation
release		Stable, production-ready
preview		Experimental, not production-ready

Releases follow the Semantic Versioning (SemVer) system.

Getting Started

Please follow these steps to install the package using a local location until the Unity Package Manager (UPM) allows third parties to publish packages to the UPM feed:

1. Download a release from the Releases page and extract it into your folder you use to keep your packages. It is recommended to make that folder part of your project and therefore version controlled.

2. Open your project created with the Unity software version 2018.3 (or above) and follow Unity's instructions on how to add the package to your project using UPM.

3. Anywhere in your Unity software project add a FodyWeavers.xml file.

4. Configure the various weavers Malimbe offers, e.g.:

   <?xml version="1.0" encoding="utf-8"?>
   
   <Weavers>
     <Malimbe.FodyRunner>
       <LogLevel>Error, Warning</LogLevel>
       <AssemblyNameRegex>^Zinnia</AssemblyNameRegex>
       <AssemblyNameRegex>^Assembly-CSharp</AssemblyNameRegex>
     </Malimbe.FodyRunner>
     <Malimbe.BehaviourStateRequirementMethod/>
     <Malimbe.MemberChangeMethod/>
     <Malimbe.MemberClearanceMethod/>
     <Malimbe.PropertySerializationAttribute/>
     <Malimbe.XmlDocumentationAttribute IdentifierReplacementFormat="`{0}`"/>
   </Weavers>
   

   As with any Fody weaver configuration the order of weavers is important in case a weaver should be applying to the previous weaver's changes.

   In case there are multiple configuration files all of them will be used. In that scenario, if multiple configuration files specify settings for the same weaver, a weaver will be configured using the values in the last configuration file found. A warning is logged to notify of this behavior and to allow fixing potential issues that may arise by ensuring only a single configuration exists for any used weaver.

Additional weavers are supported. To allow Malimbe's Unity software integration to find the weavers' assemblies they have to be included anywhere in the Unity software project or in one of the UPM packages the project uses.

What's In The Box

Malimbe is a collection of tools. Each project represents a solution to a specific issue.

FodyRunner

A standalone library that allows running Fody without MSBuild or Visual Studio.

• Use the XML element LogLevel to specify which log messages should be sent to the logger instance. Separate multiple levels by using multiple XML elements or separate inside an XML element by using any form of whitespace including newlines or commas. Valid values are
  • None (or don't specify LogLevel)
  • Debug
  • Info
  • Warning
  • Error
  • All
• Add XML elements AssemblyNameRegex for each assembly that should be processed. Specifying none will result in no assembly being processed and a warning being logged. The elements' values are used as (.NET Standard's) regular expressions.

FodyRunner.UnityIntegration

Weaves assemblies using FodyRunner in the Unity software Editor after the Unity softwared compiled them.

• There is no need to manually run the weaving process. The library just needs to be part of a Unity software project (it's configured to only run in the Editor) to be used. It hooks into the various callbacks the Unity software offers and automatically weaves any assembly on startup as well as when they change.

BehaviourStateRequirementMethod

A Unity software specific weaver. Changes a method to return early if a combination of the GameObject's active state and the Behaviour's enabled state doesn't match the configured state.

• Annotate a method with [RequiresBehaviourState] to use this. The method needs to be defined in a type that derives from UnityEngine.Behaviour, e.g. a MonoBehaviour.
• Use the attribute constructor's parameters to configure the specific state you need the GameObject and the Behaviour to be in.

MemberChangeMethod.Fody

A Unity software specific weaver. Calls a method before or after a data member (field or property) is changed.

• Annotate a method with [CalledBeforeChangeOf(nameof(SomeFieldOrProperty))] (or CalledAfterChangeOfAttribute) to use this. The accessibility level of the method doesn't matter and the name lookup is case insensitive.
• The method needs to follow the signature pattern void MethodName(). Use the data member's accessor in the method body to retrieve the current value. The method will only be called when Application.isPlaying is true.
• The referenced data member needs to be declared in the same type the method is declared in. For a property member a getter is required.
• A custom Editor InspectorEditor is part of FodyRunner.UnityIntegration and is automatically used to draw the inspector for any type that doesn't use a custom editor. This custom editor calls the configured methods on change of a data member annotated with one of the two attributes above.
  • Note that this is only done when the Editor is playing, as changes at design time should be handled by using PropertyAttributes and calling the same method that uses CalledAfterChangeOfAttribute for this data member in OnEnable of the declaring type. With that in place the data member's state will properly be handled, right at startup and from there on by the annotated change handling methods.
  • Inherit from InspectorEditor in custom editors for types that use one of the two attributes above and override the method DrawProperty.

MemberClearanceMethod.Fody

A generic weaver. Creates ClearMemberName() methods for any member MemberName that is of reference type. Sets the member to null in this method.

• Annotate a member with [Cleared] to use this. Both properties and fields are supported. Properties need a setter.
• Instead of ClearMemberName the method name's prefix can be customized with the XML attribute MethodNamePrefix, e.g.:

    <Malimbe.MemberClearanceMethod MethodNamePrefix="Nullify" />
  

  This will create methods named NullifyMemberName.
• In case the method already exists the instructions will be weaved into the end of the method. The method name lookup is case insensitive.

PropertySerializationAttribute.Fody

A Unity software specific weaver. Ensures the backing field for a property is serialized.

• Annotate a property with [Serialized] to use this. The property needs at least a getter or a setter.
• If the property's backing field doesn't use [SerializeField] it will be added.
• If the property is an auto-implemented property the backing field will be renamed to match the property's name for viewing in the Unity software inspector. All backing field usages inside methods of the declaring type will be updated to use this new name. Since C# doesn't allow multiple members of a type to share a name, the backing field's name will differ in the first character's case. E.g.:
  • public int Counter { get; set; } will use a backing field called counter.
  • protected bool isValid { get; private set; } will use a backing field called IsValid.

XmlDocumentationAttribute.Fody

A generic weaver (though made for the Unity software). Looks up the XML <summary> documentation for a field and adds [Tooltip] to that field with that summary.

• Annotate a field with [DocumentedByXml] to use this.
• Instead of TooltipAttribute the added attribute can be customized with the XML attribute FullAttributeName, e.g.:

    <Malimbe.XmlDocumentationAttribute FullAttributeName="Some.Other.Namespace.DocumentationAttribute" />
  

  The attribute needs to have a constructor that takes a string parameter and nothing else. Note that the attribute name has to be the full type name, i.e. prefixed by the namespace.
• In case the attribute already exists on the field it will be replaced.
• Tags in the XML documentation comment like <see cref="Something"/> will be replaced by just the "identifier" Something by default. To customize this behavior the XML attribute IdentifierReplacementFormat can be used, e.g.:

    <Malimbe.XmlDocumentationAttribute IdentifierReplacementFormat="`{0}`" />
  

  The format needs to specify a placeholder {0}, otherwise an error will be logged and the default replacement format will be used instead.

UnityPackaging

Outputs a ready-to-use folder with the appropriate hierarchy to copy into a Unity software project's Assets folder. The output includes both the Unity software integration libraries as well as all weavers and their attributes listed above.

Contributing

If you want to raise a bug report or feature request please follow SUPPORT.md.

While we intend to add more features to Malimbe when we identify a need or use case, we're always open to take contributions! Please follow the contribution guidelines found in CONTRIBUTING.md.

Naming

Inspired by Fody's naming the name "Malimbe" comes from the small birds that belong to the weaver family Ploceidae.

Tools And Products Used

• Fody

License

Malimbe is released under the MIT License.

Third-party notices can be found in THIRD_PARTY_NOTICES.md

Disclaimer

These materials are not sponsored by or affiliated with Unity Technologies or its affiliates. "Unity" and "Unity Package Manager" are trademarks or registered trademarks of Unity Technologies or its affiliates in the U.S. and elsewhere.

Changelog

9.4.0 (2019-03-21)

Bug Fixes

• MemberChange: exception thrown when using multiple attributes (d227180)
• MemberChange: only show undo/redo warning at runtime (41661a5)

Features

• MemberChange: allow handling changes to superclass member (33c2c2a)