Differences

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--- tutorial:mixin_examples [2023/12/18 02:18] – [Capturing local values] solidblock
+++ tutorial:mixin_examples [2024/11/18 15:52] (current) – fixed some of the argument names in mixinextra section bemoty
@@ Line 272: / Line 272: @@
 ==== Capture locals with MixinExtras ====
+:!: See the oficial MixinExtra's [[https://github.com/LlamaLad7/MixinExtras/wiki/Local|Wiki]].
 :!: MixinExtras required Fabric Loader 0.15 or above, or you have to manually specify it in ''build.gradle''.
-:!: If ther are multiple locals with that type, you have to specify ''ordinal'' or it will throw an error.
+:!: If there are multiple locals with that type, you have to specify ''ordinal'' or it will throw an error.
 Mixin:
@@ Line 280: / Line 282: @@
 @Inject(method = "foo()V", at = @At(value = "TAIL"))
 private void injected(CallbackInfo ci, @Local TypeArg2 arg2) {
-  arg1.doSomething4();
+  arg2.doSomething4();
 }
 </code>
@@ Line 296: / Line 298: @@
 </code>
-==== Capturing locals from multiple locals of a type ====
+==== Capturing one of multiple locals of a type ====
 Mixin:
 <code java>
 @Inject(method = "foo()V", at = @At(value = "TAIL"))
 private void injected(CallbackInfo ci, @Local(ordinal = 2) TypeArg arg) {
-  arg1.doSomething4();
+  arg.doSomething4();
 }
 </code>
@@ Line 314: / Line 316: @@
     doSomething();
 +   injected(new CallbackInfo("foo", false), arg3);
+  }
+</code>
+===== Modifying locals =====
+This requires MixinExtras.
+Mixin:
+<code java>
+  @Inject(method = "foo()V", at = @At(value = "INVOKE", target = "doSomething()V", shift = At.Shift.AFTER))
+  private static void injected(CallbackInfo ci, @Local LocalRef<String> localRef) {
+    localRef.set(localRef.get() + " - modified")
+  }
+</code>
+Result:
+<code diff>
+  public void foo() {
+    String s = "example string";
+    doSomething();
++   s = s + " - modified";
+    doSomething2(s);
   }
 </code>