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Merge branch 'version3' into dev

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zaaarf 2023-03-18 17:24:43 +01:00
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15 changed files with 1052 additions and 279 deletions
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2
build.gradle
View file

@ -20,7 +20,7 @@ repositories {
dependencies {
implementation 'com.squareup:javapoet:1.13.0'
implementation 'ftbsc:lll:0.3.0'
implementation 'ftbsc:lll:0.3.4'
}
jar {

25
src/main/java/ftbsc/lll/exceptions/AmbiguousDefinitionException.java Normal file
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@ -0,0 +1,25 @@
package ftbsc.lll.exceptions;
/**
* Thrown when the processor finds multiple methods matching the
* given criteria.
*/
public class AmbiguousDefinitionException extends RuntimeException {
/**
* Constructs a new ambiguous definition exception with the specified detail message.
* @param message the detail message
*/
public AmbiguousDefinitionException(String message) {
super(message);
}
/**
* Constructs a new ambiguous definition exception with the specified detail message and cause.
* @param message the detail message
* @param cause the cause, may be null (indicating nonexistent or unknown cause)
*/
public AmbiguousDefinitionException(String message, Throwable cause) {
super(message, cause);
}
}

22
src/main/java/ftbsc/lll/exceptions/InvalidResourceException.java Normal file
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@ -0,0 +1,22 @@
package ftbsc.lll.exceptions;
/**
* Thrown when a resource passed as an argument is not found.
*/
public class InvalidResourceException extends RuntimeException {
/**
* Empty constructor, used when the provided resource exists but is empty.
*/
public InvalidResourceException() {
super("The specified resource was empty!");
}
/**
* Named constructor, used when the specified resource doesn't exist.
* @param name the resource name
*/
public InvalidResourceException(String name) {
super(String.format("Specified resource %s was not found!", name));
}
}

27
src/main/java/ftbsc/lll/exceptions/MappingNotFoundException.java Normal file
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@ -0,0 +1,27 @@
package ftbsc.lll.exceptions;
import ftbsc.lll.processor.tools.obfuscation.ObfuscationMapper;
/**
* Thrown upon failure to find the requested mapping within a loaded {@link ObfuscationMapper}.
*/
public class MappingNotFoundException extends RuntimeException {
/**
* Constructs a new mapping not found exception for the specified mapping.
* @param mapping the relevant mapping
*/
public MappingNotFoundException(String mapping) {
super(String.format("Could not find mapping for %s!", mapping));
}
/**
* Constructs a new mapping not found exception for the specified mapping
* with the specified reason.
* @param mapping the relevant mapping
* @param reason the reason message
*/
public MappingNotFoundException(String mapping, String reason) {
this(mapping + ": " + reason);
}
}

15
src/main/java/ftbsc/lll/exceptions/TargetNotFoundException.java Normal file
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@ -0,0 +1,15 @@
package ftbsc.lll.exceptions;
/**
* Thrown upon failure to find an existing method from a stub.
*/
public class TargetNotFoundException extends RuntimeException {
/**
* Constructs a new target not found exception for the specified method stub.
* @param stub the stub's name (and descriptor possibly)
*/
public TargetNotFoundException(String stub) {
super(String.format("Could not find member corresponding to stub: %s.", stub));
}
}

126
src/main/java/ftbsc/lll/processor/ASTUtils.java
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@ -1,126 +0,0 @@
package ftbsc.lll.processor;
import com.squareup.javapoet.ArrayTypeName;
import com.squareup.javapoet.ClassName;
import com.squareup.javapoet.MethodSpec;
import com.squareup.javapoet.TypeName;
import ftbsc.lll.tools.DescriptorBuilder;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.TypeMirror;
import java.lang.annotation.Annotation;
import java.util.List;
import java.util.stream.Collectors;
/**
* Collection of static utils that didn't really fit into the main class.
*/
public class ASTUtils {
/**
* Finds, among the methods of a class cl, the one annotated with ann, and tries to build
* a {@link ExecutableElement} from it.
* @param cl the {@link ExecutableElement} for the class containing the desired method
* @param ann the {@link Class} corresponding to the desired annotation
* @return a {@link List} of {@link MethodSpec}s annotated with the given annotation
* @since 0.2.0
*/
public static List<ExecutableElement> findAnnotatedMethods(TypeElement cl, Class<? extends Annotation> ann) {
return cl.getEnclosedElements()
.stream()
.filter(e -> e.getAnnotation(ann) != null)
.map(e -> (ExecutableElement) e)
.collect(Collectors.toList());
}
/**
* Builds a type descriptor from the given {@link TypeMirror}
* @param t the {@link TypeMirror} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeMirror t) {
TypeName type = TypeName.get(t);
StringBuilder desc = new StringBuilder();
//add array brackets
while(type instanceof ArrayTypeName) {
desc.append("[");
type = ((ArrayTypeName) type).componentType;
}
if(type instanceof ClassName) {
ClassName var = (ClassName) type;
desc.append(DescriptorBuilder.nameToDescriptor(var.canonicalName(), 0));
} else {
if(TypeName.BOOLEAN.equals(type))
desc.append("Z");
else if(TypeName.CHAR.equals(type))
desc.append("C");
else if(TypeName.BYTE.equals(type))
desc.append("B");
else if(TypeName.SHORT.equals(type))
desc.append("S");
else if(TypeName.INT.equals(type))
desc.append("I");
else if(TypeName.FLOAT.equals(type))
desc.append("F");
else if(TypeName.LONG.equals(type))
desc.append("J");
else if(TypeName.DOUBLE.equals(type))
desc.append("D");
else if(TypeName.VOID.equals(type))
desc.append("V");
}
return desc.toString();
}
/**
* Builds a method descriptor from the given {@link ExecutableElement}.
* @param m the {@link ExecutableElement} for the method
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromExecutableElement(ExecutableElement m) {
StringBuilder methodSignature = new StringBuilder();
methodSignature.append("(");
m.getParameters().forEach(p -> methodSignature.append(descriptorFromType(p.asType())));
methodSignature.append(")");
methodSignature.append(descriptorFromType(m.getReturnType()));
return methodSignature.toString();
}
/**
* Maps a {@link javax.lang.model.element.Modifier} to its reflective
* {@link java.lang.reflect.Modifier} equivalent.
* @param m the {@link Modifier} to map
* @return an integer representing the modifier
* @see java.lang.reflect.Modifier
* @since 0.2.0
*/
public static int mapModifier(Modifier m) {
switch(m) {
case PUBLIC:
return java.lang.reflect.Modifier.PUBLIC;
case PROTECTED:
return java.lang.reflect.Modifier.PROTECTED;
case PRIVATE:
return java.lang.reflect.Modifier.PRIVATE;
case ABSTRACT:
return java.lang.reflect.Modifier.ABSTRACT;
case STATIC:
return java.lang.reflect.Modifier.STATIC;
case FINAL:
return java.lang.reflect.Modifier.FINAL;
case TRANSIENT:
return java.lang.reflect.Modifier.TRANSIENT;
case VOLATILE:
return java.lang.reflect.Modifier.VOLATILE;
case SYNCHRONIZED:
return java.lang.reflect.Modifier.SYNCHRONIZED;
case NATIVE:
return java.lang.reflect.Modifier.NATIVE;
case STRICTFP:
return java.lang.reflect.Modifier.STRICT;
default:
return 0;
}
}
}

335
src/main/java/ftbsc/lll/processor/LilleroProcessor.java
View file

@ -2,33 +2,32 @@ package ftbsc.lll.processor;
import com.squareup.javapoet.*;
import ftbsc.lll.IInjector;
import ftbsc.lll.exceptions.AmbiguousDefinitionException;
import ftbsc.lll.exceptions.InvalidResourceException;
import ftbsc.lll.processor.annotations.*;
import ftbsc.lll.processor.tools.obfuscation.ObfuscationMapper;
import ftbsc.lll.proxies.FieldProxy;
import ftbsc.lll.proxies.MethodProxy;
import ftbsc.lll.tools.SrgMapper;
import javax.annotation.processing.*;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.*;
import javax.lang.model.type.ExecutableType;
import javax.lang.model.type.MirroredTypeException;
import javax.lang.model.type.TypeMirror;
import javax.tools.Diagnostic;
import javax.tools.FileObject;
import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
import java.io.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.*;
import java.util.stream.Collectors;
import static ftbsc.lll.processor.ASTUtils.*;
import static ftbsc.lll.processor.tools.ASTUtils.*;
import static ftbsc.lll.processor.tools.ASTUtils.getClassFullyQualifiedName;
import static ftbsc.lll.processor.tools.JavaPoetUtils.*;
/**
* The actual annotation processor behind the magic.
@ -36,6 +35,7 @@ import static ftbsc.lll.processor.ASTUtils.*;
*/
@SupportedAnnotationTypes("ftbsc.lll.processor.annotations.Patch")
@SupportedSourceVersion(SourceVersion.RELEASE_8)
@SupportedOptions("mappingsFile")
public class LilleroProcessor extends AbstractProcessor {
/**
* A {@link Set} of {@link String}s that will contain the fully qualified names
@ -43,6 +43,50 @@ public class LilleroProcessor extends AbstractProcessor {
*/
private final Set<String> generatedInjectors = new HashSet<>();
/**
* The {@link ObfuscationMapper} used to convert classes and variables
* to their obfuscated equivalent. Will be null when no mapper is in use.
*/
private ObfuscationMapper mapper;
/**
* Initializes the processor with the processing environment by
* setting the {@code processingEnv} field to the value of the
* {@code processingEnv} argument.
* @param processingEnv environment to access facilities the tool framework
* provides to the processor
* @throws IllegalStateException if this method is called more than once.
* @since 0.3.0
*/
@Override
public synchronized void init(ProcessingEnvironment processingEnv) {
super.init(processingEnv);
String location = processingEnv.getOptions().get("mappingsFile");
if(location == null)
mapper = null;
else {
InputStream targetStream;
try {
URI target = new URI(location);
targetStream = target.toURL().openStream();
} catch(URISyntaxException | IOException e) {
//may be a local file path
File f = new File(location);
if(!f.exists())
throw new InvalidResourceException(location);
try {
targetStream = new FileInputStream(f);
} catch(FileNotFoundException ex) {
throw new InvalidResourceException(location);
}
}
//assuming its tsrg file
//todo: replace crappy homebaked parser with actual library
this.mapper = new ObfuscationMapper(new BufferedReader(new InputStreamReader(targetStream,
StandardCharsets.UTF_8)).lines());
}
}
/**
* Where the actual processing happens.
* It filters through whatever annotated class it's fed, and checks whether it contains
@ -56,7 +100,7 @@ public class LilleroProcessor extends AbstractProcessor {
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
for (TypeElement annotation : annotations) {
if(annotation.getQualifiedName().toString().equals(Patch.class.getName())) {
if(annotation.getQualifiedName().contentEquals(Patch.class.getName())) {
Set<TypeElement> validInjectors =
roundEnv.getElementsAnnotatedWith(annotation)
.stream()
@ -64,7 +108,7 @@ public class LilleroProcessor extends AbstractProcessor {
.filter(this::isValidInjector)
.collect(Collectors.toSet());
if(!validInjectors.isEmpty()) {
validInjectors.forEach(this::generateInjector);
validInjectors.forEach(this::generateInjectors);
if (!this.generatedInjectors.isEmpty()) {
generateServiceProvider();
return true;
@ -96,55 +140,117 @@ public class LilleroProcessor extends AbstractProcessor {
})) return true;
else {
processingEnv.getMessager().printMessage(Diagnostic.Kind.WARNING,
"Missing valid @Injector method in @Patch class " + elem + ", skipping.");
String.format("Missing valid @Injector method in @Patch class %s, skipping.", elem));
return false;
}
}
/**
* Generates the Injector corresponding to the given class.
* Generates the Injector(s) contained in the given class.
* Basically implements the {@link IInjector} interface for you.
* @param cl the {@link TypeElement} for the given class
*/
private void generateInjector(TypeElement cl) {
SrgMapper mapper;
try { //TODO: cant we get it from local?
URL url = new URL("https://data.fantabos.co/output.tsrg");
InputStream is = url.openStream();
mapper = new SrgMapper(new BufferedReader(new InputStreamReader(is,
StandardCharsets.UTF_8)).lines());
is.close();
} catch(IOException e) {
throw new RuntimeException("Could not open the specified TSRG file!", e);
}
Patch ann = cl.getAnnotation(Patch.class);
String targetClassCanonicalName;
try {
targetClassCanonicalName = ann.value().getCanonicalName();
} catch(MirroredTypeException e) {
targetClassCanonicalName = e.getTypeMirror().toString();
} //pretty sure class names de facto never change but better safe than sorry
String targetClassSrgName = mapper.getMcpClass(targetClassCanonicalName.replace('.', '/'));
ExecutableElement targetMethod = findAnnotatedMethods(cl, Target.class).get(0); //there should only be one
String targetMethodDescriptor = descriptorFromMethodSpec(targetMethod);
String targetMethodSrgName = mapper.getSrgMember(
targetClassCanonicalName.replace('.', '/'),
targetMethod.getSimpleName() + " " + targetMethodDescriptor
);
ExecutableElement injectorMethod = findAnnotatedMethods(cl, Injector.class).get(0); //there should only be one
private void generateInjectors(TypeElement cl) {
//find class information
Patch patchAnn = cl.getAnnotation(Patch.class);
String targetClassFQN =
findClassName(getClassFullyQualifiedName(patchAnn, Patch::value), this.mapper)
.replace('/', '.');
//find package information
Element packageElement = cl.getEnclosingElement();
while (packageElement.getKind() != ElementKind.PACKAGE)
packageElement = packageElement.getEnclosingElement();
String packageName = packageElement.toString();
String injectorSimpleClassName = cl.getSimpleName().toString() + "Injector";
String injectorClassName = packageName + "." + injectorSimpleClassName;
MethodSpec stubOverride = MethodSpec.overriding(targetMethod)
//find injector(s) and target(s)
List<ExecutableElement> injectors = findAnnotatedMethods(cl, Injector.class);
List<ExecutableElement> targets = findAnnotatedMethods(cl, Target.class);
//declare it once for efficiency
List<String> targetNames =
targets.stream()
.map(ExecutableElement::getSimpleName)
.map(Object::toString)
.collect(Collectors.toList());
//this will contain the classes to generate: the key is the class name
Map<String, InjectorInfo> toGenerate = new HashMap<>();
for(ExecutableElement inj : injectors) {
Injector[] minjAnn = inj.getAnnotationsByType(Injector.class);
int iterationNumber = 1;
for(Injector injectorAnn : minjAnn) { //java is dumb
List<ExecutableElement> injectionCandidates = targets;
if(!injectorAnn.targetName().equals("") && targetNames.contains(injectorAnn.targetName())) {
//case 1: it has a name, try to match it
injectionCandidates =
injectionCandidates
.stream()
.filter(i -> i.getSimpleName().contentEquals(injectorAnn.targetName()))
.collect(Collectors.toList());
} else if(targets.size() == 1) {
//case 2: there is only one target
injectionCandidates = new ArrayList<>();
injectionCandidates.add(targets.get(0));
} else {
//case 3: try to match by injectTargetName
String inferredName = inj.getSimpleName()
.toString()
.replaceFirst("inject", "");
injectionCandidates =
injectionCandidates
.stream()
.filter(t -> t.getSimpleName().toString().equalsIgnoreCase(inferredName))
.collect(Collectors.toList());
}
ExecutableElement injectionTarget = null;
if(injectionCandidates.size() == 1)
injectionTarget = injectionCandidates.get(0);
else {
List<TypeMirror> params = classArrayFromAnnotation(injectorAnn, Injector::params, processingEnv.getElementUtils());
if(params.size() != 0) {
StringBuilder descr = new StringBuilder("(");
for(TypeMirror p : params)
descr.append(descriptorFromType(TypeName.get(p)));
descr.append(")");
injectionCandidates =
injectionCandidates
.stream()
.filter(t -> //we care about arguments but not really about return type
descr.toString()
.split("\\)")[0]
.equalsIgnoreCase(descriptorFromExecutableElement(t).split("\\)")[0])
).collect(Collectors.toList());
}
if(injectionCandidates.size() == 1)
injectionTarget = injectionCandidates.get(0);
}
//if we haven't found it yet, it's an ambiguity
if(injectionTarget == null)
throw new AmbiguousDefinitionException(String.format("Unclear target for injector %s::%s!", cl.getSimpleName(), inj.getSimpleName()));
else toGenerate.put(
String.format("%sInjector%d", cl.getSimpleName(), iterationNumber),
new InjectorInfo(inj, injectionTarget)
);
iterationNumber++;
}
}
//iterate over the map and generate the classes
for(String injName : toGenerate.keySet()) {
String targetMethodDescriptor = descriptorFromExecutableElement(toGenerate.get(injName).target);
String targetMethodName = findMemberName(targetClassFQN, toGenerate.get(injName).target.getSimpleName().toString(), targetMethodDescriptor, this.mapper);
MethodSpec stubOverride = MethodSpec.overriding(toGenerate.get(injName).targetStub)
.addStatement("throw new $T($S)", RuntimeException.class, "This is a stub and should not have been called")
.build();
@ -160,24 +266,25 @@ public class LilleroProcessor extends AbstractProcessor {
TypeName.get(processingEnv
.getElementUtils()
.getTypeElement("org.objectweb.asm.tree.MethodNode").asType()), "main").build())
.addStatement("super." + injectorMethod.getSimpleName() + "(clazz, main)", TypeName.get(cl.asType()))
.addStatement(String.format("super.%s(clazz, main)", toGenerate.get(injName).injector.getSimpleName()), TypeName.get(cl.asType()))
.build();
TypeSpec injectorClass = TypeSpec.classBuilder(injectorSimpleClassName)
TypeSpec injectorClass = TypeSpec.classBuilder(injName)
.addModifiers(Modifier.PUBLIC)
.superclass(cl.asType())
.addSuperinterface(ClassName.get(IInjector.class))
.addMethod(buildStringReturnMethod("name", cl.getSimpleName().toString()))
.addMethod(buildStringReturnMethod("reason", ann.reason()))
.addMethod(buildStringReturnMethod("targetClass", targetClassSrgName.replace('/', '.')))
.addMethod(buildStringReturnMethod("methodName", targetMethodSrgName))
.addMethod(buildStringReturnMethod("reason", patchAnn.reason()))
.addMethod(buildStringReturnMethod("targetClass", targetClassFQN))
.addMethod(buildStringReturnMethod("methodName", targetMethodName))
.addMethod(buildStringReturnMethod("methodDesc", targetMethodDescriptor))
.addMethods(generateRequestedProxies(cl, mapper))
.addMethods(generateRequestedProxies(cl, this.mapper))
.addMethod(stubOverride)
.addMethod(inject)
.build();
JavaFile javaFile = JavaFile.builder(packageName, injectorClass).build();
String injectorClassName = String.format("%s.%s", packageName, injName);
try {
JavaFileObject injectorFile = processingEnv.getFiler().createSourceFile(injectorClassName);
@ -190,20 +297,6 @@ public class LilleroProcessor extends AbstractProcessor {
this.generatedInjectors.add(injectorClassName);
}
/**
* Builds a {@link MethodSpec} for a public method whose body simply returns a {@link String}.
* @param name the name of the method
* @param returnString the {@link String} to return
* @return the built {@link MethodSpec}
*/
private static MethodSpec buildStringReturnMethod(String name, String returnString) {
return MethodSpec.methodBuilder(name)
.addModifiers(Modifier.PUBLIC)
.addAnnotation(Override.class)
.returns(String.class)
.addStatement("return $S", returnString)
.build();
}
/**
@ -213,71 +306,75 @@ public class LilleroProcessor extends AbstractProcessor {
* @return a {@link List} of method specs
* @since 0.2.0
*/
private List<MethodSpec> generateRequestedProxies(TypeElement cl, SrgMapper mapper) {
private List<MethodSpec> generateRequestedProxies(TypeElement cl, ObfuscationMapper mapper) {
List<MethodSpec> generated = new ArrayList<>();
findAnnotatedMethods(cl, FindMethod.class)
.stream()
.filter(m -> !m.getModifiers().contains(Modifier.STATIC)) //skip static stuff as we can't override it
.filter(m -> !m.getModifiers().contains(Modifier.FINAL)) //in case someone is trying to be funny
.forEach(m -> {
FindMethod ann = m.getAnnotation(FindMethod.class);
String targetMethodName = ann.name().equals("") ? m.getSimpleName().toString() : ann.name();
try {
ExecutableElement targetMethod = (ExecutableElement) findMemberFromStub(m, processingEnv);
MethodSpec.Builder b = MethodSpec.overriding(m);
Method targetMethod = ann.parent().getMethod(
targetMethodName,
ann.params()
);
String targetParentFQN = findClassName(((TypeElement) targetMethod.getEnclosingElement()).getQualifiedName().toString(), mapper);
b.addStatement("$T bd = $T.builder($S)",
MethodProxy.Builder.class,
MethodProxy.class,
targetMethodName
);
b.addStatement("bd.setParent($S)", targetMethod.getDeclaringClass().getCanonicalName());
b.addStatement("bd.setModifier($L)", targetMethod.getModifiers());
for(Class<?> p : targetMethod.getParameterTypes())
b.addStatement("bd.addParameter($T.class)", p);
b.addStatement("bd.setReturnType($T.class)", targetMethod.getReturnType());
b.addStatement("return bd.build()");
generated.add(b.build());
} catch(NoSuchMethodException e) {
processingEnv.getMessager().printMessage(
Diagnostic.Kind.ERROR,
"Method not found: " + targetMethodName
findMemberName(targetParentFQN, targetMethod.getSimpleName().toString(), descriptorFromExecutableElement(targetMethod), mapper)
);
b.addStatement("bd.setParent($S)", targetParentFQN);
for(Modifier mod : targetMethod.getModifiers())
b.addStatement("bd.addModifier($L)", mapModifier(mod));
for(VariableElement p : targetMethod.getParameters()) {
if(p.asType().getKind().isPrimitive())
b.addStatement("bd.addParameter($T.class)", p.asType());
else b.addStatement("bd.addParameter($S, $L)", getInnermostComponentType(p.asType()), getArrayLevel(p.asType()));
}
if(targetMethod.getReturnType().getKind().isPrimitive())
b.addStatement("bd.setReturnType($T.class)", targetMethod.getReturnType());
else b.addStatement("bd.setReturnType($S, $L)", getInnermostComponentType(targetMethod.getReturnType()), getArrayLevel(targetMethod.getReturnType()));
b.addStatement("return bd.build()");
generated.add(b.build());
});
findAnnotatedMethods(cl, FindField.class)
.stream()
.filter(m -> !m.getModifiers().contains(Modifier.STATIC))
.filter(m -> !m.getModifiers().contains(Modifier.FINAL))
.forEach(m -> {
FindField ann = m.getAnnotation(FindField.class);
String targetFieldName = ann.name().equals("") ? m.getSimpleName().toString() : ann.name();
try {
VariableElement targetField = (VariableElement) findMemberFromStub(m, processingEnv);
MethodSpec.Builder b = MethodSpec.overriding(m);
Field targetField = ann.parent().getField(targetFieldName);
String targetParentFQN = findClassName(((TypeElement) targetField.getEnclosingElement()).getQualifiedName().toString(), mapper);
b.addStatement("$T bd = $T.builder($S)",
FieldProxy.Builder.class,
FieldProxy.class,
targetFieldName
findMemberName(targetParentFQN, targetField.getSimpleName().toString(), null, mapper)
);
b.addStatement("bd.setParent($S)", targetField.getDeclaringClass().getCanonicalName());
b.addStatement("bd.setModifier($L)", targetField.getModifiers());
b.addStatement("bd.setType($T.class)", targetField.getType());
b.addStatement("bd.setParent($S)", ((TypeElement) targetField.getEnclosingElement()).getQualifiedName().toString());
for(Modifier mod : targetField.getModifiers())
b.addStatement("bd.addModifier($L)", mapModifier(mod));
if(targetField.asType().getKind().isPrimitive())
b.addStatement("bd.setType($T.class)", targetField.asType());
else b.addStatement("bd.setType($S, $L)", getInnermostComponentType(targetField.asType()), getArrayLevel(targetField.asType()));
b.addStatement("return bd.build()");
generated.add(b.build());
} catch(NoSuchFieldException e) {
processingEnv.getMessager().printMessage(
Diagnostic.Kind.ERROR,
"Field not found: " + targetFieldName + " in class " + ann.parent().getCanonicalName()
);
}
});
return generated;
}
/**
* Generates the Service Provider file for the generated injectors.
*/
@ -294,4 +391,36 @@ public class LilleroProcessor extends AbstractProcessor {
throw new RuntimeException(e);
}
}
/**
* Container for information about a class that is to be generated.
* Only used internally.
*/
private class InjectorInfo {
/**
* The {@link ExecutableElement} corresponding to the injector method.
*/
public final ExecutableElement injector;
/**
* The {@link ExecutableElement} corresponding to the target method stub.
*/
public final ExecutableElement targetStub;
/**
* The {@link ExecutableElement} corresponding to the target method.
*/
private final ExecutableElement target;
/**
* Public constructor.
* @param injector the injector {@link ExecutableElement}
* @param targetStub the target {@link ExecutableElement}
*/
public InjectorInfo(ExecutableElement injector, ExecutableElement targetStub) {
this.injector = injector;
this.targetStub = targetStub;
this.target = (ExecutableElement) findMemberFromStub(targetStub, processingEnv);
}
}
}

12
src/main/java/ftbsc/lll/processor/annotations/FindField.java
View file

@ -16,6 +16,16 @@ import java.lang.annotation.RetentionPolicy;
@Retention(RetentionPolicy.CLASS)
@java.lang.annotation.Target(ElementType.METHOD)
public @interface FindField {
Class<?> parent();
/**
* @return the {@link Class} object containing the desired field,
* or the {@link Object} class if not specified (the {@link Class}
* from {@link Patch#value()} is instead used)
*/
Class<?> parent() default Object.class;
/**
* @return the name of the field, will default to the empty string
* (the name of the annotated method will instead be used)
*/
String name() default "";
}

20
src/main/java/ftbsc/lll/processor/annotations/FindMethod.java
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@ -17,7 +17,23 @@ import java.lang.annotation.RetentionPolicy;
@Retention(RetentionPolicy.CLASS)
@java.lang.annotation.Target(ElementType.METHOD)
public @interface FindMethod {
Class<?> parent();
/**
* @return the {@link Class} object containing the desired method,
* or the {@link Object} class if not specified (the {@link Class}
* from {@link Patch#value()} is instead used)
*/
Class<?> parent() default Object.class;
/**
* @return the name of the method, will default to the empty string
* (the name of the annotated method will instead be used)
*/
String name() default "";
Class<?>[] params();
/**
* @return a list of the parameters of the method, will default to empty
* array (in that case, an attempt will be made to match a method without
* args first)
*/
Class<?>[] params() default {};
}

18
src/main/java/ftbsc/lll/processor/annotations/Injector.java
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@ -1,6 +1,7 @@
package ftbsc.lll.processor.annotations;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
@ -10,9 +11,24 @@ import java.lang.annotation.RetentionPolicy;
* as parameters. It will be discarded otherwise.
* It will also be discarded unless the containing class is annotated with {@link Patch}
* and another method within the class is annotated with {@link Target}.
* This annotation may be added multiple times, in order to target multiple methods.
* @see Patch
* @see Target
*/
@Retention(RetentionPolicy.CLASS)
@Repeatable(MultipleInjectors.class)
@java.lang.annotation.Target(ElementType.METHOD)
public @interface Injector {}
public @interface Injector {
/**
* @return the name of the stub annotated with {@link Target} this is referring to.
* @since 0.3.0
*/
String targetName() default "";
/**
* @return the parameters of the stub annotated with {@link Target} this is referring
* to (used to discern in case of method stubs by the same name)
* @since 0.3.0
*/
Class<?>[] params() default {};
}

19
src/main/java/ftbsc/lll/processor/annotations/MultipleInjectors.java Normal file
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@ -0,0 +1,19 @@
package ftbsc.lll.processor.annotations;
import java.lang.annotation.ElementType;
import java.lang.annotation.Repeatable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* Used to support {@link Injector} as a {@link Repeatable} annotation.
* @since 0.3.0
*/
@Retention(RetentionPolicy.CLASS)
@java.lang.annotation.Target(ElementType.METHOD)
public @interface MultipleInjectors {
/**
* @return the {@link Injector} annotations, as an array
*/
Injector[] value();
}

13
src/main/java/ftbsc/lll/processor/annotations/Target.java
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@ -15,4 +15,15 @@ import java.lang.annotation.RetentionPolicy;
*/
@Retention(RetentionPolicy.CLASS)
@java.lang.annotation.Target(ElementType.METHOD)
public @interface Target {}
public @interface Target {
/**
* When set to false, tells the processor to first try to match a single method by name,
* and to only check parameters if further clarification is needed.
* @implNote While non-strict mode is more computationally efficient, it's ultimately not
* relevant, as it only matters at compile time. Do not set this to false unless
* you know what you're doing.
* @since 0.3.0
*/
boolean strict() default true;
}

299
src/main/java/ftbsc/lll/processor/tools/ASTUtils.java Normal file
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@ -0,0 +1,299 @@
package ftbsc.lll.processor.tools;
import com.squareup.javapoet.*;
import ftbsc.lll.exceptions.AmbiguousDefinitionException;
import ftbsc.lll.exceptions.MappingNotFoundException;
import ftbsc.lll.exceptions.TargetNotFoundException;
import ftbsc.lll.processor.annotations.FindField;
import ftbsc.lll.processor.annotations.FindMethod;
import ftbsc.lll.processor.annotations.Patch;
import ftbsc.lll.processor.annotations.Target;
import ftbsc.lll.processor.tools.obfuscation.ObfuscationMapper;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.*;
import javax.lang.model.type.*;
import javax.lang.model.util.Elements;
import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Function;
import java.util.stream.Collectors;
import static ftbsc.lll.processor.tools.JavaPoetUtils.descriptorFromExecutableElement;
import static ftbsc.lll.processor.tools.JavaPoetUtils.methodDescriptorFromParams;
/**
* Collection of AST-related static utils that didn't really fit into the main class.
*/
public class ASTUtils {
/**
* Finds, among the methods of a class cl, the one annotated with ann, and tries to build
* a {@link ExecutableElement} from it.
* @param cl the {@link ExecutableElement} for the class containing the desired method
* @param ann the {@link Class} corresponding to the desired annotation
* @return a {@link List} of {@link MethodSpec}s annotated with the given annotation
* @since 0.2.0
*/
public static List<ExecutableElement> findAnnotatedMethods(TypeElement cl, Class<? extends Annotation> ann) {
return cl.getEnclosedElements()
.stream()
.filter(e -> e.getAnnotationsByType(ann).length != 0)
.map(e -> (ExecutableElement) e)
.collect(Collectors.toList());
}
/**
* Maps a {@link javax.lang.model.element.Modifier} to its reflective
* {@link java.lang.reflect.Modifier} equivalent.
* @param m the {@link Modifier} to map
* @return an integer representing the modifier
* @see java.lang.reflect.Modifier
* @since 0.2.0
*/
public static int mapModifier(Modifier m) {
switch(m) {
case PUBLIC:
return java.lang.reflect.Modifier.PUBLIC;
case PROTECTED:
return java.lang.reflect.Modifier.PROTECTED;
case PRIVATE:
return java.lang.reflect.Modifier.PRIVATE;
case ABSTRACT:
return java.lang.reflect.Modifier.ABSTRACT;
case STATIC:
return java.lang.reflect.Modifier.STATIC;
case FINAL:
return java.lang.reflect.Modifier.FINAL;
case TRANSIENT:
return java.lang.reflect.Modifier.TRANSIENT;
case VOLATILE:
return java.lang.reflect.Modifier.VOLATILE;
case SYNCHRONIZED:
return java.lang.reflect.Modifier.SYNCHRONIZED;
case NATIVE:
return java.lang.reflect.Modifier.NATIVE;
case STRICTFP:
return java.lang.reflect.Modifier.STRICT;
default:
return 0;
}
}
/**
* Calculates the array nesting level for a {@link TypeMirror}.
* @param t the type mirror to get it for
* @return the array nesting level
* @since 0.3.0
*/
public static int getArrayLevel(TypeMirror t) {
int arrayLevel = 0;
while(t.getKind() == TypeKind.ARRAY) {
t = ((ArrayType) t).getComponentType();
arrayLevel++;
}
return arrayLevel;
}
/**
* Calculates the array nesting level for a {@link TypeMirror}.
* @param t the type mirror to get it for
* @return the array nesting level
* @since 0.3.0
*/
public static TypeMirror getInnermostComponentType(TypeMirror t) {
while(t.getKind() == TypeKind.ARRAY)
t = ((ArrayType) t).getComponentType();
return t;
}
/**
* Safely extracts a {@link Class} from an annotation and gets its fully qualified name.
* @param ann the annotation containing the class
* @param fun the annotation function returning the class
* @return the fully qualified name of the given class
* @since 0.3.0
*/
public static <T extends Annotation> String getClassFullyQualifiedName(T ann, Function<T, Class<?>> fun) {
try {
return fun.apply(ann).getCanonicalName();
} catch(MirroredTypeException e) {
return e.getTypeMirror().toString();
}
}
/**
* Safely extracts a {@link Class} array from an annotation.
* @param ann the annotation containing the class
* @param fun the annotation function returning the class
* @param elementUtils the element utils corresponding to the {@link ProcessingEnvironment}
* @return a list of {@link TypeMirror}s representing the classes
* @since 0.3.0
*/
public static <T extends Annotation> List<TypeMirror> classArrayFromAnnotation(T ann, Function<T, Class<?>[]> fun, Elements elementUtils) {
List<TypeMirror> params = new ArrayList<>();
try {
params.addAll(Arrays.stream(fun.apply(ann))
.map(Class::getCanonicalName)
.map(fqn -> elementUtils.getTypeElement(fqn).asType())
.collect(Collectors.toList()));
} catch(MirroredTypesException e) {
params.addAll(e.getTypeMirrors());
}
return params;
}
/**
* Finds the class name and maps it to the correct format.
* @param name the fully qualified name of the class to convert
* @param mapper the {@link ObfuscationMapper} to use, may be null
* @return the fully qualified class name
* @since 0.3.0
*/
public static String findClassName(String name, ObfuscationMapper mapper) {
try {
return mapper == null ? name : mapper.obfuscateClass(name).replace('/', '.');
} catch(MappingNotFoundException e) {
return name;
}
}
/**
* Finds the class name and maps it to the correct format.
* @param patchAnn the {@link Patch} annotation containing target class info
* @param finderAnn an annotation containing metadata about the target, may be null
* @param parentFun the function to get the parent from the finderAnn
* @return the fully qualified class name
* @since 0.3.0
*/
private static <T extends Annotation> String findClassName(Patch patchAnn, T finderAnn, Function<T, Class<?>> parentFun) {
String fullyQualifiedName;
if(finderAnn != null) {
fullyQualifiedName = getClassFullyQualifiedName(finderAnn, parentFun);
if(!fullyQualifiedName.equals("java.lang.Object"))
return findClassName(fullyQualifiedName, null);
}
fullyQualifiedName = getClassFullyQualifiedName(patchAnn, Patch::value);
return findClassName(fullyQualifiedName, null);
}
/**
* Finds the member name and maps it to the correct format.
* @param parentFQN the already mapped FQN of the parent class
* @param memberName the name of the member
* @param mapper the {@link ObfuscationMapper} to use, may be null
* @return the internal class name
* @since 0.3.0
*/
public static String findMemberName(String parentFQN, String memberName, String methodDescriptor, ObfuscationMapper mapper) {
try {
return mapper == null ? memberName : mapper.obfuscateMember(parentFQN, memberName, methodDescriptor);
} catch(MappingNotFoundException e) {
return memberName;
}
}
/**
* Finds a method given name, container and descriptor.
* @param parentFQN the fully qualified name of the parent class of the method
* @param name the name to search for
* @param descr the descriptor to search for
* @param strict whether the search should be strict (see {@link Target#strict()} for more info)
* @param env the {@link ProcessingEnvironment} to perform the operation in
* @return the desired method, if it exists
* @throws AmbiguousDefinitionException if it finds more than one candidate
* @throws TargetNotFoundException if it finds no valid candidate
* @since 0.3.0
*/
private static ExecutableElement findMethod(String parentFQN, String name, String descr, boolean strict, ProcessingEnvironment env) {
TypeElement parent = env.getElementUtils().getTypeElement(parentFQN);
if(parent == null)
throw new AmbiguousDefinitionException(String.format("Could not find parent class %s!", parentFQN));
//try to find by name
List<ExecutableElement> candidates = parent.getEnclosedElements()
.stream()
.filter(e -> e instanceof ExecutableElement)
.map(e -> (ExecutableElement) e)
.filter(e -> e.getSimpleName().contentEquals(name))
.collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(String.format("%s %s", name, descr));
if(candidates.size() == 1 && !strict)
return candidates.get(0);
if(descr == null) {
throw new AmbiguousDefinitionException(
String.format("Found %d methods named %s in class %s!", candidates.size(), name, parentFQN)
);
} else {
candidates = candidates.stream()
.filter(strict
? c -> descr.equals(descriptorFromExecutableElement(c))
: c -> descr.split("\\)")[0].equalsIgnoreCase(descriptorFromExecutableElement(c).split("\\)")[0])
).collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(String.format("%s %s", name, descr));
if(candidates.size() > 1)
throw new AmbiguousDefinitionException(
String.format("Found %d methods named %s in class %s!", candidates.size(), name, parentFQN)
);
return candidates.get(0);
}
}
/**
* Finds the real class member (field or method) corresponding to a stub annotated with
* {@link Target} or {@link FindMethod} or {@link FindField}.
* @param stub the {@link ExecutableElement} for the stub
* @param env the {@link ProcessingEnvironment} to perform the operation in
* @return the {@link Element} corresponding to the method or field
* @throws AmbiguousDefinitionException if it finds more than one candidate
* @throws TargetNotFoundException if it finds no valid candidate
* @since 0.3.0
*/
public static Element findMemberFromStub(ExecutableElement stub, ProcessingEnvironment env) {
//the parent always has a @Patch annotation
Patch patchAnn = stub.getEnclosingElement().getAnnotation(Patch.class);
//there should ever only be one of these
Target targetAnn = stub.getAnnotation(Target.class); //if this is null strict mode is always disabled
FindMethod findMethodAnn = stub.getAnnotation(FindMethod.class); //this may be null, it means no fallback info
FindField findFieldAnn = stub.getAnnotation(FindField.class);
String parentFQN, memberName;
if(findFieldAnn == null) { //methods
parentFQN = findClassName(patchAnn, findMethodAnn, FindMethod::parent);
String methodDescriptor =
findMethodAnn != null
? methodDescriptorFromParams(findMethodAnn, FindMethod::params, env.getElementUtils())
: descriptorFromExecutableElement(stub);
memberName =
findMethodAnn != null && !findMethodAnn.name().equals("")
? findMethodAnn.name()
: stub.getSimpleName().toString();
return findMethod(
parentFQN,
memberName,
methodDescriptor,
targetAnn != null && targetAnn.strict(),
env
);
} else { //fields
parentFQN = findClassName(patchAnn, findFieldAnn, FindField::parent);
memberName = findFieldAnn.name().equals("")
? stub.getSimpleName().toString()
: findFieldAnn.name();
TypeElement parent = env.getElementUtils().getTypeElement(parentFQN);
List<VariableElement> candidates =
parent.getEnclosedElements()
.stream()
.filter(f -> f instanceof VariableElement)
.filter(f -> f.getSimpleName().contentEquals(memberName))
.map(f -> (VariableElement) f)
.collect(Collectors.toList());
if(candidates.size() == 0)
throw new TargetNotFoundException(stub.getSimpleName().toString());
else return candidates.get(0); //there can only ever be one
}
}
}

110
src/main/java/ftbsc/lll/processor/tools/JavaPoetUtils.java Normal file
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@ -0,0 +1,110 @@
package ftbsc.lll.processor.tools;
import com.squareup.javapoet.*;
import ftbsc.lll.tools.DescriptorBuilder;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.Modifier;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.util.Elements;
import java.lang.annotation.Annotation;
import java.util.List;
import java.util.function.Function;
import static ftbsc.lll.processor.tools.ASTUtils.classArrayFromAnnotation;
/**
* Collection of static utils that rely on JavaPoet to function.
*/
public class JavaPoetUtils {
/**
* Builds a {@link MethodSpec} for a public method whose body simply returns a {@link String}.
* @param name the name of the method
* @param returnString the {@link String} to return
* @return the built {@link MethodSpec}
*/
public static MethodSpec buildStringReturnMethod(String name, String returnString) {
return MethodSpec.methodBuilder(name)
.addModifiers(Modifier.PUBLIC)
.addAnnotation(Override.class)
.returns(String.class)
.addStatement("return $S", returnString)
.build();
}
/**
* Builds a type descriptor from the given {@link TypeName}.
* @param type the {@link TypeName} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeName type) {
StringBuilder desc = new StringBuilder();
//add array brackets
while(type instanceof ArrayTypeName) {
desc.append("[");
type = ((ArrayTypeName) type).componentType;
}
if(type instanceof ClassName || type instanceof ParameterizedTypeName) {
ClassName var = type instanceof ParameterizedTypeName ? ((ParameterizedTypeName) type).rawType : (ClassName) type;
desc.append(DescriptorBuilder.nameToDescriptor(var.canonicalName(), 0));
} else {
if(TypeName.BOOLEAN.equals(type))
desc.append("Z");
else if(TypeName.CHAR.equals(type))
desc.append("C");
else if(TypeName.BYTE.equals(type))
desc.append("B");
else if(TypeName.SHORT.equals(type))
desc.append("S");
else if(TypeName.INT.equals(type))
desc.append("I");
else if(TypeName.FLOAT.equals(type))
desc.append("F");
else if(TypeName.LONG.equals(type))
desc.append("J");
else if(TypeName.DOUBLE.equals(type))
desc.append("D");
else if(TypeName.VOID.equals(type))
desc.append("V");
}
return desc.toString();
}
/**
* Builds a type descriptor from the given {@link TypeMirror}.
* @param t the {@link TypeMirror} representing the desired type
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromType(TypeMirror t) {
return descriptorFromType(TypeName.get(t));
}
/**
* Builds a method descriptor from the given {@link ExecutableElement}.
* @param m the {@link ExecutableElement} for the method
* @return a {@link String} containing the relevant descriptor
*/
public static String descriptorFromExecutableElement(ExecutableElement m) {
StringBuilder methodSignature = new StringBuilder();
methodSignature.append("(");
m.getParameters().forEach(p -> methodSignature.append(descriptorFromType(p.asType())));
methodSignature.append(")");
methodSignature.append(descriptorFromType(m.getReturnType()));
return methodSignature.toString();
}
/**
* Builds a (partial, not including the return type) method descriptor from its parameters
* @param ann the annotation containing the class
* @param fun the annotation function returning the class
* @return the method descriptor
*/
public static <T extends Annotation> String methodDescriptorFromParams(T ann, Function<T, Class<?>[]> fun, Elements elementUtils) {
List<TypeMirror> mirrors = classArrayFromAnnotation(ann, fun, elementUtils);
StringBuilder sb = new StringBuilder("(");
for(TypeMirror t : mirrors)
sb.append(descriptorFromType(t));
sb.append(")");
return sb.toString();
}
}

200
src/main/java/ftbsc/lll/processor/tools/obfuscation/ObfuscationMapper.java Normal file
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@ -0,0 +1,200 @@
package ftbsc.lll.processor.tools.obfuscation;
import ftbsc.lll.exceptions.AmbiguousDefinitionException;
import ftbsc.lll.exceptions.MappingNotFoundException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Collectors;
import java.util.stream.Stream;
/**
* Parses a .tsrg file into a mapper capable of converting from
* deobfuscated names to obfuscated ones.
* Obviously, it may only be used at runtime if the .tsrg file is
* included in the resources. However, in that case, I'd recommend
* using the built-in Forge one and refrain from including an extra
* resource for no good reason.
* TODO: CSV format
* @since 0.2.0
*/
public class ObfuscationMapper {
/**
* A Map using the deobfuscated names as keys,
* holding information for that class as value.
*/
private final Map<String, ObfuscationData> mapper = new HashMap<>();
/**
* The public constructor.
* Should be passed a {@link Stream} of Strings, one representing each line.
* Whether they contain line endings or not is irrelevant.
* @param str a {@link Stream} of strings
*/
public ObfuscationMapper(Stream<String> str) {
AtomicReference<String> currentClass = new AtomicReference<>("");
str.forEach(l -> {
if(l.startsWith("\t"))
mapper.get(currentClass.get()).addMember(l);
else {
String[] sp = l.split(" ");
ObfuscationData s = new ObfuscationData(sp[0], sp[1]);
currentClass.set(s.unobf);
mapper.put(s.unobf, s);
}
});
}
/**
* Gets the obfuscated name of the class.
* @param name the unobfuscated internal name of the desired class
* @return the obfuscated name of the class
* @throws MappingNotFoundException if no mapping is found
*/
public String obfuscateClass(String name) {
ObfuscationData data = mapper.get(name.replace('.', '/'));
if(data == null)
throw new MappingNotFoundException(name);
else return data.obf;
}
/**
* Gets the unobfuscated name of the class.
* Due to how it's implemented, it's considerably less efficient than its
* opposite operation.
* @param obfName the obfuscated internal name of the desired class
* @return the deobfuscated name of the class
*/
public String deobfuscateClass(String obfName) {
ObfuscationData data = getObfuscationData(obfName);
return data.unobf;
}
/**
* Gets the obfuscated name of a class member (field or method).
* The method signature must be in this format: "methodName methodDescriptor",
* with a space, because that's how it is in .tsrg files.
* @param parentName the unobfuscated internal name of the parent class
* @param memberName the field name or method signature
* @param methodDescriptor the optional descriptor of the member, may be null or partial
* @return the obfuscated name of the given member
* @throws MappingNotFoundException if no mapping is found
*/
public String obfuscateMember(String parentName, String memberName, String methodDescriptor) {
ObfuscationData data = mapper.get(parentName.replace('.', '/'));
if(data == null)
throw new MappingNotFoundException(parentName + "::" + memberName);
String member = data.get(memberName, methodDescriptor);
if(member == null)
throw new MappingNotFoundException(parentName + "::" + memberName);
return member;
}
/**
* Gets the unobfuscated name of the given member.
* Due to how it's implemented, it's considerably less efficient than its
* opposite operation.
* @param parentObf the obfuscated internal name of the container class
* @param memberObf the field name or method signature
* @return the deobfuscated name of the given member
*/
public String deobfuscateMember(String parentObf, String memberObf) {
ObfuscationData data = getObfuscationData(parentObf);
for(String unobf : data.members.keySet())
if(data.members.get(unobf).equals(memberObf))
return unobf;
return null;
}
/**
* Used internally. Gets the obfuscation data corresponding to the given obfuscated class name.
* @param classObfuscatedName the internal name of the obfuscated class
* @return the desired {@link ObfuscationData} object
* @throws MappingNotFoundException if no {@link ObfuscationData} object is found
*/
private ObfuscationData getObfuscationData(String classObfuscatedName) {
for(ObfuscationData s : mapper.values())
if(s.obf.equals(classObfuscatedName))
return s;
throw new MappingNotFoundException(classObfuscatedName);
}
/**
* Private class used internally for storing information about each
* class. It's private because there is no good reason anyone would
* want to access this outside of this class.
*/
private static class ObfuscationData {
/**
* The unobfuscated name (FQN with '/' instad of '.') of the class.
*/
private final String unobf;
/**
* The obfuscated internal name (FQN with '/' instad of '.') of the class.
*/
private final String obf;
/**
* A {@link Map} tying each member's name or signature to its
* obfuscated counterpart.
*/
private final Map<String, String> members;
/**
* The constructor. It takes in the names (obfuscated and non-obfuscated)
* of a class.
* @param unobf the unobfuscated name
* @param obf the obfuscated name
*/
private ObfuscationData(String unobf, String obf) {
this.unobf = unobf;
this.obf = obf;
this.members = new HashMap<>();
}
/**
* Adds a member to the target class.
* For fields only the names are required; for methods,
* this takes in the full signature ({@code name + " " + space}).
* @param s the String representing the declaration line
*/
public void addMember(String s) {
String[] split = s.trim().split(" ");
if(split.length == 2) //field
members.put(split[0], split[1]);
else if (split.length == 3) //method
members.put(split[0] + " " + split[1], split[2]);
}
/**
* Gets an obfuscated member given the method name and a method descriptor,
* which may be partial (i.e. not include return type) or null if the member
* is not a method.
* @param memberName member name
* @param methodDescriptor the method descriptor, or null if it's not a method
* @return the requested obfuscated name, or null if nothing was found
* @throws AmbiguousDefinitionException if not enough data was given to uniquely identify a mapping
*/
public String get(String memberName, String methodDescriptor) {
if(methodDescriptor == null)
return members.get(memberName);
List<String> candidates = members.keySet().stream().filter(m -> m.startsWith(memberName)).collect(Collectors.toList());
if(candidates.size() == 1)
return members.get(candidates.get(0));
String signature = memberName + " " + methodDescriptor;
candidates = candidates.stream().filter(m -> m.startsWith(signature)).collect(Collectors.toList());
switch(candidates.size()) {
case 0:
return null;
case 1:
return members.get(candidates.get(0));
default:
throw new AmbiguousDefinitionException("Mapper could not uniquely identify method " + unobf + "::" + memberName);
}
}
}
}