Enable checkstyle

build.gradle

@@ -81,12 +81,12 @@ repositories {
 sourceSets {
     legacy {
         ext.languageVersion = 8
-        ext.compatibility = '1.6'
+        ext.compatibility = '1.8'
     }
     main {
         compileClasspath += legacy.output
         ext.languageVersion = 8
-        ext.compatibility = '1.6'
+        ext.compatibility = '1.8'
     }
     ap {
         compileClasspath += main.output
@@ -96,13 +96,13 @@ sourceSets {
     fernflower {
         compileClasspath += main.output
         ext.languageVersion = 8
-        ext.compatibility = '1.6'
+        ext.compatibility = '1.8'
         ext.modularityExcluded = true
     }
     agent {
         compileClasspath += main.output
         ext.languageVersion = 8
-        ext.compatibility = '1.6'
+        ext.compatibility = '1.8'
     }
     bridge {
         compileClasspath += main.output
@@ -322,7 +322,7 @@ checkstyle {
         "year"        : project.inceptionYear
     ]
     configFile = file("checkstyle.xml")
-    toolVersion = '8.44'
+    toolVersion = '10.17.0'
 }
 
 // Source compiler configuration

checkstyle.xml

@@ -9,7 +9,7 @@
     Description: none
 -->
 <module name="Checker">
-  <property name="severity" value="warning"/>
+  <property name="severity" value="error"/>
   <property name="charset" value="UTF-8"/>
   <module name="BeforeExecutionExclusionFileFilter">
     <property name="fileNamePattern" value="module\-info\.java$"/>
@@ -131,13 +131,6 @@
     <module name="UncommentedMain"/>
     <module name="SuppressionCommentFilter"/>
   </module>
-  <module name="LineLength">
-    <property name="ignorePattern" value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
-    <property name="max" value="150"/>
-  </module>
-  <module name="LineLength">
-    <property name="ignorePattern" value="^[ ]*([a-zA-Z0-9\{\}\+\|\&amp;\&quot;@\(\)\?\.\:]|//)"/>
-  </module>
   <module name="FileTabCharacter">
     <property name="eachLine" value="true"/>
   </module>

src/main/java/org/spongepowered/asm/mixin/FabricUtil.java

@@ -33,9 +33,25 @@ public final class FabricUtil {
     public static final String KEY_COMPATIBILITY = "fabric-compat";
 
     // fabric mixin version compatibility boundaries, (major * 1000 + minor) * 1000 + patch
+
+    /**
+     * Fabric compatibility version 0.9.2
+     */
     public static final int COMPATIBILITY_0_9_2 = 9002; // 0.9.2+mixin.0.8.2 incompatible local variable handling
+
+    /**
+     * Fabric compatibility version 0.10.0
+     */
     public static final int COMPATIBILITY_0_10_0 = 10000; // 0.10.0+mixin.0.8.4
+
+    /**
+     * Fabric compatibility version 0.14.0
+     */
     public static final int COMPATIBILITY_0_14_0 = 14000; // 0.14.0+mixin.0.8.6
+
+    /**
+     * Latest compatibility version
+     */
     public static final int COMPATIBILITY_LATEST = COMPATIBILITY_0_14_0;
 
     public static String getModId(IMixinConfig config) {
@@ -65,4 +81,7 @@ private static <T> T getDecoration(IMixinConfig config, String key, T defaultVal
             return defaultValue;
         }
     }
+
+    private FabricUtil() {
+    }
 }

src/main/java/org/spongepowered/asm/mixin/injection/callback/CallbackInjector.java

@@ -570,7 +570,9 @@ private void inject(final Callback callback) {
             }
         }
         this.invokeCallback(callback, callbackMethod);
-        if (callback.usesCallbackInfo) this.injectCancellationCode(callback);
+        if (callback.usesCallbackInfo) {
+            this.injectCancellationCode(callback);
+        }
 
         callback.inject();
         this.info.notifyInjected(callback.target);

src/main/java/org/spongepowered/asm/mixin/injection/invoke/util/InvokeUtil.java

@@ -32,7 +32,7 @@
 
 import java.util.Arrays;
 
-public class InvokeUtil {
+public final class InvokeUtil {
     public static Type[] getOriginalArgs(InjectionNode node) {
         return Type.getArgumentTypes(((MethodInsnNode) node.getOriginalTarget()).desc);
     }
@@ -47,4 +47,7 @@ public static Type[] getCurrentArgs(InjectionNode node) {
         }
         return currentArgs;
     }
+
+    private InvokeUtil() {
+    }
 }

src/main/java/org/spongepowered/asm/mixin/injection/struct/InjectionNodes.java

@@ -30,7 +30,6 @@
 
 import org.objectweb.asm.tree.AbstractInsnNode;
 import org.spongepowered.asm.util.Bytecode;
-import org.spongepowered.asm.util.CompareUtil;
 
 /**
  * Used to keep track of instruction nodes in a {@link Target} method which are
@@ -198,7 +197,7 @@ public <V> V getDecoration(String key) {
          */
         @Override
         public int compareTo(InjectionNode other) {
-            return other == null ? Integer.MAX_VALUE : CompareUtil.compare(this.hashCode(), other.hashCode());
+            return other == null ? Integer.MAX_VALUE : Integer.compare(this.hashCode(), other.hashCode());
         }
 
         /* (non-Javadoc)

src/main/java/org/spongepowered/asm/mixin/transformer/ClassInfo.java

@@ -232,7 +232,11 @@ public static class FrameData {
          * Frame local size 
          */
         public final int size;
-        public final int rawSize; // Fabric non-adjusted frame size for legacy support
+
+        /**
+         * Fabric: non-adjusted frame size for legacy support
+         */
+        public final int rawSize;
 
         FrameData(int index, int type, int locals, int size) {
             this.index = index;

src/main/java/org/spongepowered/asm/mixin/transformer/MethodMapper.java

@@ -122,11 +122,11 @@ public String getHandlerName(MixinInfo mixin, MixinMethodNode method) {
         String mod = MethodMapper.getMixinSourceId(mixin, "");
         String methodName = method.name;
         if (!mod.isEmpty()) {
-	    	//It's common for mods to prefix their own handlers, let's account for that happening
-	    	if (methodName.startsWith(mod) && methodName.length() > mod.length() + 1 && Chars.contains(new char[] {'_', '$'}, methodName.charAt(mod.length()))) {
-	    		methodName = methodName.substring(mod.length() + 1);
-	    	}
-	    	mod += '$';
+            //It's common for mods to prefix their own handlers, let's account for that happening
+            if (methodName.startsWith(mod) && methodName.length() > mod.length() + 1 && Chars.contains(new char[] {'_', '$'}, methodName.charAt(mod.length()))) {
+                methodName = methodName.substring(mod.length() + 1);
+            }
+            mod += '$';
         }
         String methodUID = MethodMapper.getMethodUID(methodName, method.desc, !method.isSurrogate());
         return String.format("%s$%s%s$%s%s", prefix, classUID, methodUID, mod, methodName);
@@ -145,18 +145,18 @@ public String getUniqueName(MixinInfo mixin, MethodNode method, String sessionId
         String uniqueIndex = Integer.toHexString(this.nextUniqueMethodIndex++);
         String methodName = method.name;
         if (method instanceof MethodNodeEx) {
-        	String mod = MethodMapper.getMixinSourceId(mixin, "");
-        	if (!mod.isEmpty()) {
-	        	//It's rarer for mods to prefix their @Unique methods, but let's account for it anyway
-	        	if (methodName.startsWith(mod) && methodName.length() > mod.length() + 1 && Chars.contains(new char[] {'_', '$'}, methodName.charAt(mod.length()))) {
-	        		methodName = methodName.substring(mod.length() + 1);
-	        	}
-	        	if (preservePrefix) {
-	        		methodName += '$' + mod;
-	        	} else {
-	        		methodName = mod + '$' + methodName;
-	        	}
-        	}
+            String mod = MethodMapper.getMixinSourceId(mixin, "");
+            if (!mod.isEmpty()) {
+                //It's rarer for mods to prefix their @Unique methods, but let's account for it anyway
+                if (methodName.startsWith(mod) && methodName.length() > mod.length() + 1 && Chars.contains(new char[] {'_', '$'}, methodName.charAt(mod.length()))) {
+                    methodName = methodName.substring(mod.length() + 1);
+                }
+                if (preservePrefix) {
+                    methodName += '$' + mod;
+                } else {
+                    methodName = mod + '$' + methodName;
+                }
+            }
         }
         String pattern = preservePrefix ? "%2$s_$md$%1$s$%3$s" : "md%s$%s$%s";
         return String.format(pattern, sessionId.substring(30), methodName, uniqueIndex);

src/main/java/org/spongepowered/asm/mixin/transformer/MixinApplicatorStandard.java

@@ -781,7 +781,7 @@ protected final void checkConstraints(MixinTargetContext mixin, MethodNode metho
 
     /**
      * Finds a method in the target class
-     * @param searchFor
+     * @param searchFor The method node to search for
      * 
      * @return Target method matching searchFor, or null if not found
      */
@@ -797,7 +797,7 @@ protected final MethodNode findTargetMethod(MethodNode searchFor) {
 
     /**
      * Finds a field in the target class
-     * @param searchFor
+     * @param searchFor The field node to search for
      * 
      * @return Target field matching searchFor, or null if not found
      */

src/main/java/org/spongepowered/asm/mixin/transformer/MixinConfig.java

@@ -59,7 +59,6 @@
 import org.spongepowered.asm.mixin.transformer.throwables.InvalidMixinException;
 import org.spongepowered.asm.service.IMixinService;
 import org.spongepowered.asm.service.MixinService;
-import org.spongepowered.asm.util.CompareUtil;
 import org.spongepowered.asm.util.VersionNumber;
 
 import com.google.common.base.Strings;
@@ -1374,7 +1373,7 @@ public int compareTo(MixinConfig other) {
             return 0;
         }
         if (other.priority == this.priority) {
-            return CompareUtil.compare(this.order, other.order);
+            return Integer.compare(this.order, other.order);
         } else {
             return (this.priority < other.priority) ? -1 : 1;
         }

src/main/java/org/spongepowered/asm/mixin/transformer/MixinInfo.java

@@ -73,7 +73,6 @@
 import org.spongepowered.asm.util.LanguageFeatures;
 import org.spongepowered.asm.util.asm.ASM;
 import org.spongepowered.asm.util.asm.MethodNodeEx;
-import org.spongepowered.asm.util.CompareUtil;
 import org.spongepowered.asm.util.perf.Profiler;
 import org.spongepowered.asm.util.perf.Profiler.Section;
 
@@ -1342,7 +1341,7 @@ public int compareTo(MixinInfo other) {
             return 0;
         }
         if (other.priority == this.priority) {
-            return CompareUtil.compare(this.order, other.order);
+            return Integer.compare(this.order, other.order);
         } else {
             return (this.priority < other.priority) ? -1 : 1;
         }

src/main/java/org/spongepowered/asm/mixin/transformer/MixinInheritanceTracker.java

@@ -38,62 +38,70 @@
 import org.spongepowered.asm.util.Bytecode;
 
 public enum MixinInheritanceTracker implements IListener {
-	INSTANCE;
-
-	@Override
-	public void onPrepare(MixinInfo mixin) {
-	}
-
-	@Override
-	public void onInit(MixinInfo mixin) {
-		ClassInfo mixinInfo = mixin.getClassInfo();
-		assert mixinInfo.isMixin(); //The mixin should certainly be a mixin
-
-		for (ClassInfo superType = mixinInfo.getSuperClass(); superType != null && superType.isMixin(); superType = superType.getSuperClass()) {
-			List<MixinInfo> children = parentMixins.get(superType.getName());
-
-			if (children == null) {
-				parentMixins.put(superType.getName(), children = new ArrayList<MixinInfo>());
-			}
-
-			children.add(mixin);
-		}
-	}
-
-	public List<MethodNode> findOverrides(ClassInfo owner, String name, String desc) {
-		return findOverrides(owner.getName(), name, desc);
-	}
-
-	public List<MethodNode> findOverrides(String owner, String name, String desc) {
-		List<MixinInfo> children = parentMixins.get(owner);
-		if (children == null) return Collections.emptyList();
-
-		List<MethodNode> out = new ArrayList<MethodNode>(children.size());
-
-		for (MixinInfo child : children) {
-			ClassNode node = child.getClassNode(ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);
-
-			MethodNode method = Bytecode.findMethod(node, name, desc);
-			if (method == null || Bytecode.isStatic(method)) continue;
-
-			switch (Bytecode.getVisibility(method)) {
-			case PRIVATE:
-				break;
-
-			case PACKAGE:
-				int ownerSplit = owner.lastIndexOf('/');
-				int childSplit = node.name.lastIndexOf('/');
-				//There is a reasonable chance mixins are in the same package, so it is viable that a package private method is overridden
-				if (ownerSplit != childSplit || (ownerSplit > 0 && !owner.regionMatches(0, node.name, 0, ownerSplit + 1))) break;
-
-			default:
-				out.add(method);
-				break;
-			}
-		}
-
-		return out.isEmpty() ? Collections.<MethodNode>emptyList() : out;
-	}
-
-	private final Map<String, List<MixinInfo>> parentMixins = new HashMap<String, List<MixinInfo>>();
+    INSTANCE;
+
+    @Override
+    public void onPrepare(MixinInfo mixin) {
+    }
+
+    @Override
+    public void onInit(MixinInfo mixin) {
+        ClassInfo mixinInfo = mixin.getClassInfo();
+        assert mixinInfo.isMixin(); //The mixin should certainly be a mixin
+
+        for (ClassInfo superType = mixinInfo.getSuperClass(); superType != null && superType.isMixin(); superType = superType.getSuperClass()) {
+            List<MixinInfo> children = parentMixins.get(superType.getName());
+
+            if (children == null) {
+                parentMixins.put(superType.getName(), children = new ArrayList<MixinInfo>());
+            }
+
+            children.add(mixin);
+        }
+    }
+
+    public List<MethodNode> findOverrides(ClassInfo owner, String name, String desc) {
+        return findOverrides(owner.getName(), name, desc);
+    }
+
+    public List<MethodNode> findOverrides(String owner, String name, String desc) {
+        List<MixinInfo> children = parentMixins.get(owner);
+        if (children == null) {
+            return Collections.emptyList();
+        }
+
+        List<MethodNode> out = new ArrayList<MethodNode>(children.size());
+
+        for (MixinInfo child : children) {
+            ClassNode node = child.getClassNode(ClassReader.SKIP_DEBUG | ClassReader.SKIP_FRAMES);
+
+            MethodNode method = Bytecode.findMethod(node, name, desc);
+            if (method == null || Bytecode.isStatic(method)) {
+                continue;
+            }
+
+            switch (Bytecode.getVisibility(method)) {
+            case PRIVATE:
+                break;
+
+            case PACKAGE:
+                int ownerSplit = owner.lastIndexOf('/');
+                int childSplit = node.name.lastIndexOf('/');
+                //There is a reasonable chance mixins are in the same package, so it is viable that a package private method is overridden
+                if (ownerSplit != childSplit || (ownerSplit > 0 && !owner.regionMatches(0, node.name, 0, ownerSplit + 1))) {
+                    break;
+                }
+
+                out.add(method);
+                break;
+            default:
+                out.add(method);
+                break;
+            }
+        }
+
+        return out.isEmpty() ? Collections.<MethodNode>emptyList() : out;
+    }
+
+    private final Map<String, List<MixinInfo>> parentMixins = new HashMap<String, List<MixinInfo>>();
 }

src/main/java/org/spongepowered/asm/mixin/transformer/MixinPreProcessorInterface.java

@@ -140,7 +140,7 @@ protected boolean validateField(MixinTargetContext context, FieldNode field, Ann
 
         //Making a field non-final will result in verification crashes, so @Mutable is always a mistake
         if (Annotations.getVisible(field, Mutable.class) != null) {
-        	throw new InvalidInterfaceMixinException(this.mixin, String.format("@Shadow field %s.%s is marked as mutable. This is not allowed.",
+            throw new InvalidInterfaceMixinException(this.mixin, String.format("@Shadow field %s.%s is marked as mutable. This is not allowed.",
                     this.mixin, field.name));
         }