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FML Access Transformer file specification

The access transformer file format allows for targetting classes and their members for transformation of the access_flags element of the member. This allows for transforming private methods into public methods, for example.

Java Language Specification for class files

Access transformations

  • public transforms the member to be public
  • protected transforms the member to be protected
  • private transforms the member to be private
  • default transforms the member to be package private ('default')

Any access transform can have +f or -f appended to add or remove the ACC_FINAL flag.

Targets

Targets can be classes, methods or fields.

Methods are identified by parentheses after the member name.

Comments

Comments are delimited by a # sign. All content until end of line is ignored.

Important note

An access transformation pre-processor is required to allow compilation against access-transformed compiled code.

ForgeGradle has such a tool. Other tools are available to do the same thing.

Directive lines

Class transformer

<access modifier> <classname>

Example. Transforms the class net.minecraft.world.gen.structure.StructureVillagePieces$Village to public.

public net.minecraft.world.gen.structure.StructureVillagePieces$Village

Method transformer

<access modifier> <classname> <methodname><methodsignature>

Example. Transforms the method boolean net.minecraft.world.World.isValid(BlockPos p) to public.

public net.minecraft.world.World isValid(Lnet/minecraft/util/math/BlockPos;)Z

Field transformer

<access modifier> <classname> <fieldname>

Example. Transforms the field net.minecraft.world.WorldType.worldTypes to public with the final flag removed.

public-f net.minecraft.world.WorldType worldTypes