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https://github.com/zaaarf/geb-processor.git
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feat: implemented processor
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parent
2f798cb8a7
commit
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2 changed files with 135 additions and 56 deletions
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@ -18,8 +18,8 @@ repositories {
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}
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dependencies {
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implementation 'ftbsc:geb:0.1.4'
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implementation 'com.squareup:javapoet:1.13.0'
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implementation 'ftbsc:geb:0.1.0'
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}
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jar {
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@ -1,84 +1,163 @@
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package ftbsc.geb.processor;
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import ftbsc.geb.api.annotations.Event;
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import com.squareup.javapoet.*;
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import ftbsc.geb.api.annotations.Listen;
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import ftbsc.geb.api.annotations.ListenerInstance;
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import javax.annotation.processing.AbstractProcessor;
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import javax.annotation.processing.RoundEnvironment;
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import javax.annotation.processing.SupportedAnnotationTypes;
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import javax.lang.model.element.Element;
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import javax.lang.model.element.ExecutableElement;
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import javax.lang.model.element.TypeElement;
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import javax.lang.model.element.*;
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import javax.lang.model.type.TypeMirror;
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import java.lang.annotation.Annotation;
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import javax.tools.FileObject;
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import javax.tools.JavaFileObject;
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import javax.tools.StandardLocation;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.*;
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import java.util.function.BiConsumer;
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import java.util.stream.Collectors;
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/**
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*
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*/
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@SupportedAnnotationTypes({"ftbsc.geb.api.annotations.*"})
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public class GEBProcessor extends AbstractProcessor {
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private final Map<TypeMirror, Set<ListenerContainer>> listenerMap = new HashMap<>();
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private final Set<String> generatedClasses = new HashSet<>();
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@Override
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public boolean process(Set<? extends TypeElement> set, RoundEnvironment env) {
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boolean claimed = false;
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for(TypeElement ann : set) {
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BiConsumer<GEBProcessor, Element> processMethod;
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for(TypeElement ann : set)
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if(ann.getQualifiedName().contentEquals(Listen.class.getName()))
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processMethod = GEBProcessor::processListener;
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else if(ann.getQualifiedName().contentEquals(Event.class.getName()))
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processMethod = GEBProcessor::processEvent;
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else continue;
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claimed = true;
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for(Element e : env.getElementsAnnotatedWith(ann))
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processMethod.accept(this, e);
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}
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return claimed;
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for(Element e : env.getElementsAnnotatedWith(ann))
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this.processListener(e);
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if(!this.listenerMap.isEmpty()) {
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this.generateClasses();
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this.generateServiceProvider();
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return true;
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} else return false;
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}
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private final Map<Element, List<ExecutableElement>> listeners = new HashMap<>();
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private final TypeMirror listenerInterface = this.processingEnv.getElementUtils()
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.getTypeElement("ftbsc.geb.api.IListener").asType();
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private static List<Element> getMembersAnnotatedWith(TypeElement typeElement, Class<? extends Annotation> ann) {
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return typeElement.getEnclosedElements()
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.stream()
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.filter(elem -> elem.getAnnotation(ann) != null)
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.collect(Collectors.toList());
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}
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private final TypeMirror eventInterface = this.processingEnv.getElementUtils()
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.getTypeElement("ftbsc.geb.api.IEvent").asType();
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private final TypeMirror dispatcherInterface = this.processingEnv.getElementUtils()
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.getTypeElement("ftbsc.geb.api.IEventDispatcher").asType();
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private void processListener(Element target) {
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ExecutableElement listener = (ExecutableElement) target; //this will never fail
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Listen listenerAnn = target.getAnnotation(Listen.class);
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//ensure the parent is a class
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if(!(target.getEnclosingElement() instanceof TypeElement))
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return; //TODO throw error, means the annotated field was in a method
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TypeElement parent = (TypeElement) target.getEnclosingElement();
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ExecutableElement listener = (ExecutableElement) target; //this cast will never fail
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//ensure the parent is instance of IListener
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TypeElement cursor = parent;
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TypeMirror listenerInterface = this.processingEnv.getElementUtils().getTypeElement("ftbsc.geb.api.IListener").asType()
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; while(cursor != null) {
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if(cursor.getInterfaces().contains(listenerInterface))
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break;
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TypeMirror parentType = listener.getEnclosingElement().asType();
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if(!this.processingEnv.getTypeUtils().isAssignable(parentType, this.listenerInterface))
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return; //TODO throw error, parent doesn't implement the interface
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Element superclass = this.processingEnv.getTypeUtils().asElement(cursor.getSuperclass());
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if(superclass instanceof TypeElement)
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cursor = (TypeElement) superclass;
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else return; //TODO throw error, parent doesnt implement the interface
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}
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//ensure the listener method has only a single IEvent parameter
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List<? extends VariableElement> params = listener.getParameters();
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if(listener.getParameters().size() != 1)
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return; //TODO throw error, bad parameter amount
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TypeMirror event = params.get(0).asType();
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if(!this.processingEnv.getTypeUtils().isAssignable(event, this.eventInterface))
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return; //TODO throw error, bad parameter type
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List<Element> instanceSources = getMembersAnnotatedWith(parent, ListenerInstance.class);
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if(instanceSources.size() != 1)
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return; //TODO throw error, there should always be only one per class
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Element instanceSource = instanceSources.get(0);
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List<ExecutableElement> listenerList = listeners.computeIfAbsent(instanceSource, k -> new ArrayList<>());
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listenerList.add(listener);
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if(!this.listenerMap.containsKey(event))
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this.listenerMap.put(event, new HashSet<>());
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this.listenerMap.get(event).add(new ListenerContainer(listener));
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}
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private void processEvent(Element target) {
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//TODO
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private void generateClasses() {
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this.listenerMap.forEach((event, listeners) -> {
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TypeElement eventClass = (TypeElement) this.processingEnv.getTypeUtils().asElement(event);
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//reorder the injectors to follow priority
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List<ListenerContainer> ordered = listeners.stream().sorted(Comparator.comparingInt(
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container -> container.annotation.priority()
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)).collect(Collectors.toList());
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ParameterSpec eventParam = ParameterSpec.builder(TypeName.get(this.eventInterface), "event").build();
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ParameterSpec listenersParam = ParameterSpec.builder(ParameterizedTypeName.get(
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ClassName.get("java.util", "Map"), ParameterizedTypeName.get(
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ClassName.get("java.lang", "Class"),
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WildcardTypeName.subtypeOf(TypeName.get(this.dispatcherInterface))),
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ClassName.get(this.listenerInterface)), "listeners")
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.build();
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MethodSpec.Builder callListenersBuilder = MethodSpec.methodBuilder("callListeners")
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.addModifiers(Modifier.PUBLIC)
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.addAnnotation(Override.class)
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.addAnnotation(AnnotationSpec.builder(SuppressWarnings.class) //because why not
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.addMember("value" , "{$S}", "unchecked").build())
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.addParameter(eventParam)
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.addParameter(listenersParam)
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.returns(boolean.class);
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int counter = 0;
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for(ListenerContainer listener : ordered) {
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String varName = String.format("listener%d", counter);
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callListenersBuilder
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.addStatement("$T $L = $N.get($T.class)", varName, this.listenerInterface, listenersParam, listener.parent)
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.addStatement("if($L.isActive()) (($T) $L).$L($N)", varName, listener.parent,
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listener.method.getSimpleName().toString(), eventParam);
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}
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MethodSpec eventType = MethodSpec.methodBuilder("eventType")
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.addModifiers(Modifier.PUBLIC)
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.addAnnotation(Override.class)
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.returns(Class.class)
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.addStatement("return $T.class", event)
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.build();
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String clazzName = String.format("%sDispatcher", eventClass.getSimpleName());
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TypeSpec clazz = TypeSpec.classBuilder(clazzName)
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.addModifiers(Modifier.PUBLIC)
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.addSuperinterface(this.dispatcherInterface)
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.addMethod(callListenersBuilder.build())
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.addMethod(eventType)
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.build();
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String packageName = "ftbsc.geb.generated";
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JavaFile javaFile = JavaFile.builder(packageName, clazz).build();
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String resultingClassName = String.format("%s.%s", packageName, clazzName);
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try {
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JavaFileObject injectorFile = processingEnv.getFiler().createSourceFile(resultingClassName);
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PrintWriter out = new PrintWriter(injectorFile.openWriter());
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javaFile.writeTo(out);
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out.close();
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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});
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}
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/**
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* Generates the Service Provider file for the dispatchers.
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*/
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private void generateServiceProvider() {
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try {
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FileObject serviceProvider = processingEnv.getFiler().createResource(StandardLocation.CLASS_OUTPUT, "",
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"META-INF/services/ftbsc.geb.api.IEventDispatcher");
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PrintWriter out = new PrintWriter(serviceProvider.openWriter());
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this.generatedClasses.forEach(out::println);
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out.close();
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} catch(IOException e) {
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throw new RuntimeException(e);
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}
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}
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private static class ListenerContainer {
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public final ExecutableElement method;
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public final TypeMirror parent;
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public final Listen annotation;
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public ListenerContainer(ExecutableElement method) {
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this.method = method;
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this.parent = method.getEnclosingElement().asType();
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this.annotation = method.getAnnotation(Listen.class);
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}
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}
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}
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