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Add reflection helpers as metaclass expansion (#295)
* reflection helpers as metaclass expansion * move examples to custom/ & more
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-27
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6 files changed

+195
-27
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‎examples/postInit/custom/experiments.groovy

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@@ -0,0 +1,16 @@
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// no_run
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def ore_iron = ore('ingotIron')
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def item_iron = item('minecraft:iron_ingot')
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log.info(item_iron in ore_iron) // true
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log.info(item_iron in item_iron) // true
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log.info(ore_iron in item_iron) // false
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log.info(item_iron << ore_iron) // true
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log.info((item_iron * 3) << ore_iron) // false
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log.info(ore_iron >> item_iron) // true
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log.info(ore_iron >> (item_iron * 3)) // false
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file('config/').eachFile { file ->
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println file.path
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}

‎examples/postInit/custom/reflection.groovy

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// side: client
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import net.minecraft.client.gui.GuiMainMenu
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import net.minecraftforge.client.event.GuiOpenEvent
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// not a typo
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GuiMainMenu.metaClass.makePublic('minceraftRoll')
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GuiMainMenu.metaClass.makeMutable('minceraftRoll')
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eventManager.listen(GuiOpenEvent) {
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if (gui instanceof GuiMainMenu) {
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// value is randomly set in constructor and checked if its smaller than 1e-4 during rendering
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// this forces the minceraft title to always activate
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gui.minceraftRoll = 0.00001
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}
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}

‎examples/postInit/custom/vanilla.groovy

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Original file line numberDiff line numberDiff line change
@@ -5,22 +5,6 @@ import net.minecraftforge.event.entity.living.EnderTeleportEvent
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import net.minecraftforge.event.world.BlockEvent
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import net.minecraft.util.text.TextComponentString
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/*
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def ore_iron = ore('ingotIron')
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def item_iron = item('minecraft:iron_ingot')
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log.info(item_iron in ore_iron) // true
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log.info(item_iron in item_iron) // true
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log.info(ore_iron in item_iron) // false
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log.info(item_iron << ore_iron) // true
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log.info((item_iron * 3) << ore_iron) // false
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log.info(ore_iron >> item_iron) // true
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log.info(ore_iron >> (item_iron * 3)) // false
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*/
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/*file('config/').eachFile { file ->
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println file.path
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}*/
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for (var stack in mods.minecraft.allItems[5..12]) {
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log.info stack
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}

‎src/main/java/com/cleanroommc/groovyscript/helper/MetaClassExpansion.java

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package com.cleanroommc.groovyscript.helper;
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import com.cleanroommc.groovyscript.api.GroovyLog;
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import groovy.lang.MetaClass;
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import groovy.lang.MetaMethod;
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import groovy.lang.MetaProperty;
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import org.codehaus.groovy.ast.ClassNode;
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import org.codehaus.groovy.reflection.CachedField;
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import org.codehaus.groovy.reflection.CachedMethod;
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public class MetaClassExpansion {
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/**
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* Allows making any fields or methods with a specific name public. Logs an error if there is no method or field with that name. The member must be a normal
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* field/method from java and not some special cases like {@link groovy.lang.MetaBeanProperty} or other injected members via groovy.
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* Note that the {@link java.lang.reflect.Field Field} instance groovy stores and the one you get from {@link Class#getDeclaredField(String)} are different.
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* This means that calling this method will make the member only public for groovy, but not for java.
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*
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* @param mc self meta class
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* @param memberName name of members to make public
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*/
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public static void makePublic(MetaClass mc, String memberName) {
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boolean success = false;
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MetaProperty mp = mc.getMetaProperty(memberName);
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if (mp instanceof CachedField cachedField) {
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ReflectionHelper.makeFieldPublic(cachedField.getCachedField());
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success = true;
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}
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for (MetaMethod mm : mc.getMethods()) {
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if (memberName.equals(mm.getName()) && mm instanceof CachedMethod cachedMethod) {
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ReflectionHelper.makeMethodPublic(cachedMethod.getCachedMethod());
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success = true;
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}
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}
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if (!success) {
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GroovyLog.get().error("Failed to make member '{}' of class {} public, because no member was found!", memberName, getName(mc));
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}
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}
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/**
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* Allows making a field with a specific name non-final. Does nothing if the field is already non-final.
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* Logs an error if there is no field with that name. The field must be a normal field from java and not some special cases like
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* {@link groovy.lang.MetaBeanProperty} or other injected members via groovy. Note that the {@link java.lang.reflect.Field Field} instance groovy stores and
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* the one you get from {@link Class#getDeclaredField(String)} are different. This means that calling this method will make the member only non-final for
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* groovy, but not for java.
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*
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* @param mc self meta class
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* @param fieldName name of field to make non-final
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*/
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public static void makeMutable(MetaClass mc, String fieldName) {
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MetaProperty mp = mc.getMetaProperty(fieldName);
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if (mp instanceof CachedField cachedField) {
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ReflectionHelper.setFinal(cachedField.getCachedField(), false);
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return;
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}
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GroovyLog.get().error("Failed to make member '{}' of class {} mutable, because no field was found!", fieldName, getName(mc));
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}
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public static String getName(MetaClass mc) {
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ClassNode cn = mc.getClassNode();
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return cn == null ? "Unknown" : cn.getName();
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}
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}

‎src/main/java/com/cleanroommc/groovyscript/helper/ReflectionHelper.java

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@@ -5,23 +5,91 @@
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import java.lang.invoke.MethodHandle;
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import java.lang.invoke.MethodHandles;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.lang.reflect.Modifier;
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1011
public class ReflectionHelper {
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1213
private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
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private static Field modifiersField;
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private static Field fieldModifiersField;
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private static Field methodModifiersField;
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private static MethodHandle fieldModifiersSetter;
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private static MethodHandle methodModifiersSetter;
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15-
public static boolean setFinal(Field field, boolean isFinal) throws Throwable {
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public static Field getFieldModifiersField() {
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if (fieldModifiersField == null) {
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try {
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fieldModifiersField = Field.class.getDeclaredField("modifiers");
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} catch (NoSuchFieldException e) {
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// something is very wrong if this crashes
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throw new RuntimeException(e);
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}
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fieldModifiersField.setAccessible(true);
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}
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return fieldModifiersField;
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}
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public static Field getMethodModifiersField() {
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if (methodModifiersField == null) {
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try {
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methodModifiersField = Method.class.getDeclaredField("modifiers");
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} catch (NoSuchFieldException e) {
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// something is very wrong if this crashes
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throw new RuntimeException(e);
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}
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methodModifiersField.setAccessible(true);
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}
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return methodModifiersField;
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}
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private static MethodHandle getFieldModifiersSetter() {
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if (fieldModifiersSetter == null) {
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try {
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fieldModifiersSetter = LOOKUP.unreflectSetter(getFieldModifiersField());
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} catch (IllegalAccessException e) {
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// something is very wrong if this crashes
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throw new RuntimeException(e);
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}
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}
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return fieldModifiersSetter;
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}
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57+
public static MethodHandle getMethodModifiersSetter() {
58+
if (methodModifiersSetter == null) {
59+
try {
60+
methodModifiersSetter = LOOKUP.unreflectSetter(getMethodModifiersField());
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} catch (IllegalAccessException e) {
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// something is very wrong if this crashes
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throw new RuntimeException(e);
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}
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}
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return methodModifiersSetter;
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}
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public static void setModifiers(Field field, int modifiers) {
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try {
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getFieldModifiersSetter().invokeExact(field, modifiers);
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} catch (Throwable e) {
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// unlikely to crash
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throw new RuntimeException(e);
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}
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}
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public static void setModifiers(Method method, int modifiers) {
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try {
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getMethodModifiersSetter().invokeExact(method, modifiers);
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} catch (Throwable e) {
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// unlikely to crash
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throw new RuntimeException(e);
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}
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}
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public static boolean setFinal(Field field, boolean isFinal) {
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int m = field.getModifiers();
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if (Modifier.isFinal(m) == isFinal) return false;
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if (modifiersField == null) {
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modifiersField = Field.class.getDeclaredField("modifiers");
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modifiersField.setAccessible(true);
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}
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if (isFinal) m |= Modifier.FINAL;
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else m &= ~Modifier.FINAL;
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LOOKUP.unreflectSetter(modifiersField).invokeExact(field, m);
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setModifiers(field, m);
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return true;
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}
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@@ -77,4 +145,23 @@ public static Object getField(Object owner, String name) {
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return null;
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}
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}
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public static int makeModifiersPublic(int modifiers) {
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if (!Modifier.isPublic(modifiers)) modifiers |= Modifier.PUBLIC;
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if (Modifier.isProtected(modifiers)) modifiers &= ~Modifier.PROTECTED;
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if (Modifier.isPrivate(modifiers)) modifiers &= ~Modifier.PRIVATE;
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return modifiers;
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}
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public static void makeFieldPublic(Field field) {
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int mod = field.getModifiers();
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int newMod = makeModifiersPublic(mod);
159+
if (mod != newMod) setModifiers(field, newMod);
160+
}
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public static void makeMethodPublic(Method method) {
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int mod = method.getModifiers();
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int newMod = makeModifiersPublic(mod);
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if (mod != newMod) setModifiers(method, newMod);
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}
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}

‎src/main/java/com/cleanroommc/groovyscript/sandbox/GroovyScriptSandbox.java

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@@ -10,13 +10,12 @@
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import com.cleanroommc.groovyscript.event.ScriptRunEvent;
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import com.cleanroommc.groovyscript.helper.Alias;
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import com.cleanroommc.groovyscript.helper.GroovyHelper;
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import com.cleanroommc.groovyscript.helper.MetaClassExpansion;
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import com.cleanroommc.groovyscript.registry.ReloadableRegistryManager;
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import com.cleanroommc.groovyscript.sandbox.expand.ExpansionHelper;
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import com.cleanroommc.groovyscript.sandbox.transformer.GroovyScriptCompiler;
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import com.cleanroommc.groovyscript.sandbox.transformer.GroovyScriptEarlyCompiler;
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import groovy.lang.Binding;
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import groovy.lang.Closure;
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import groovy.lang.GroovyRuntimeException;
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import groovy.lang.Script;
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import groovy.lang.*;
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import groovy.util.ResourceException;
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import groovy.util.ScriptException;
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import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
@@ -60,6 +59,8 @@ public GroovyScriptSandbox() {
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registerBinding("Log", GroovyLog.get());
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registerBinding("EventManager", GroovyEventManager.INSTANCE);
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ExpansionHelper.mixinClass(MetaClass.class, MetaClassExpansion.class);
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getImportCustomizer().addStaticStars(GroovyHelper.class.getName(), MathHelper.class.getName());
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getImportCustomizer().addImports(
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"net.minecraft.world.World",

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