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package ftbsc.lll.mixin;
import ftbsc.lll.IInjector;
import ftbsc.lll.exceptions.InjectionException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.objectweb.asm.tree.ClassNode;
import org.spongepowered.asm.mixin.extensibility.IMixinConfigPlugin;
import org.spongepowered.asm.mixin.extensibility.IMixinInfo;
import java.util.*;
/**
* Allows you to load your mod's Lillero patches as a Mixin plugin.
* Extend this class and specify the child as a plugin in your mod's Mixin
* config. Refer to your mod loader's instructions for details on how this
* is done.
* Methods are left non-final in case you want to alter their behaviour in
* any way, but I can't really see any merit in doing so.
*/
public abstract class LilleroMixinPlugin implements IMixinConfigPlugin {
/**
* The {@link Logger} used by this library.
*/
protected static final Logger LOGGER = LogManager.getLogger(LilleroMixinPlugin.class);
/**
* Maps each fully-qualified name to its associated class.
*/
private final Map<String, List<IInjector>> injectorMap = new HashMap<>();
/**
* Whether Lillero should take precedence over regular mixins.
*/
private final boolean precedence;
/**
* The constructor.
* @param precedence whether Lillero should take precedence over regular mixins
*/
public LilleroMixinPlugin(boolean precedence) {
this.precedence = precedence;
}
/**
* Called after the plugin is instantiated, do any setup here.
* @param mixinPackage The mixin root package from the config
*/
@Override
public void onLoad(String mixinPackage) {
for(IInjector inj : ServiceLoader.load(IInjector.class, this.getClass().getClassLoader())) {
LOGGER.info("Registering injector {}", inj.name());
List<IInjector> injectors = this.injectorMap.get(inj.targetClass());
if(injectors == null) {
injectors = new ArrayList<>();
injectorMap.put(inj.targetClass(), injectors);
}
injectors.add(inj);
}
}
/**
* Returns null, so it's effectively ignored.
* @return always null
*/
@Override
public String getRefMapperConfig() {
return null;
}
/**
* Tells Mixin to always apply these patches.
* Lillero doesn't support conditional patches: any check should happen
* within the patch code itself, with the patch code's scope.
* @param targetClassName fully qualified class name of the target class
* @param mixinClassName fully qualified class name of the mixin
* @return always true
*/
@Override
public boolean shouldApplyMixin(String targetClassName, String mixinClassName) {
return true;
}
/**
* Does nothing, as we don't need to alter the target class list.
* @param myTargets target class set from the companion config
* @param otherTargets target class set incorporating targets from all other
* configs, read-only
*/
@Override
public void acceptTargets(Set<String> myTargets, Set<String> otherTargets) {}
/**
* This does not apply any additional mixins.
* @return always null
*/
@Override
public List<String> getMixins() {
return null;
}
/**
* Called immediately before a mixin is applied to a target class.
* Will apply Lillero patches if {@link #precedence} is true.
* @param className transformed name of the target class
* @param clazz target class tree
* @param mixinClassName name of the mixin class
* @param mixinInfo information about this mixin
*/
@Override
public void preApply(String className, ClassNode clazz, String mixinClassName, IMixinInfo mixinInfo) {
if(precedence) this.applyLilleroPatches(className, clazz);
}
/**
* Called immediately after a mixin is applied to a target class.
* Will apply Lillero patches if {@link #precedence} is false.
* @param className transformed name of the target class
* @param clazz target class tree
* @param mixinClassName name of the mixin class
* @param mixinInfo information about this mixin
*/
@Override
public void postApply(String className, ClassNode clazz, String mixinClassName, IMixinInfo mixinInfo) {
if(!precedence) this.applyLilleroPatches(className, clazz);
}
/**
* Applies the appropriate Lillero patches given a node and a class name.
* @param className the class' fully qualified name
* @param clazz the target class
*/
protected void applyLilleroPatches(String className, ClassNode clazz) {
List<IInjector> injectors = this.injectorMap.remove(className); // remove so it's only once
if(injectors != null) {
injectors.forEach((inj) -> clazz.methods.stream()
.filter(m -> m.name.equals(inj.methodName()) && m.desc.equals(inj.methodDesc()))
.forEach(m -> {
try {
LOGGER.info(
"Patching {}.{} with {} ({})",
className, m.name,
inj.name(),
inj.reason());
inj.inject(clazz, m);
} catch (InjectionException exception) {
LOGGER.error("Error applying patch '{}' : {}", inj.name(), exception);
}
}));
}
}
}
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zaaarf