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ReplaceScanner.java
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ReplaceScanner.java
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/*
* SPDX-License-Identifier: (MIT OR CECILL-C)
*
* Copyright (C) 2006-2023 INRIA and contributors
*
* Spoon is available either under the terms of the MIT License (see LICENSE-MIT.txt) or the Cecill-C License (see LICENSE-CECILL-C.txt). You as the user are entitled to choose the terms under which to adopt Spoon.
*/
package spoon.generating.replace;
import spoon.Launcher;
import spoon.SpoonException;
import spoon.generating.ReplacementVisitorGenerator;
import spoon.reflect.code.CtAssignment;
import spoon.reflect.code.CtBlock;
import spoon.reflect.code.CtComment;
import spoon.reflect.code.CtConstructorCall;
import spoon.reflect.code.CtExpression;
import spoon.reflect.code.CtFieldAccess;
import spoon.reflect.code.CtInvocation;
import spoon.reflect.code.CtThisAccess;
import spoon.reflect.code.CtTypeAccess;
import spoon.reflect.declaration.CtClass;
import spoon.reflect.declaration.CtConstructor;
import spoon.reflect.declaration.CtField;
import spoon.reflect.declaration.CtInterface;
import spoon.reflect.declaration.CtMethod;
import spoon.reflect.declaration.CtParameter;
import spoon.reflect.declaration.CtType;
import spoon.reflect.declaration.CtTypeParameter;
import spoon.reflect.factory.Factory;
import spoon.reflect.reference.CtExecutableReference;
import spoon.reflect.reference.CtTypeParameterReference;
import spoon.reflect.reference.CtTypeReference;
import spoon.reflect.visitor.CtScanner;
import spoon.reflect.visitor.filter.TypeFilter;
import spoon.support.util.internal.ElementNameMap;
import spoon.support.util.ModelList;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class ReplaceScanner extends CtScanner {
public static final String TARGET_REPLACE_PACKAGE = "spoon.support.visitor.replace";
public static final String GENERATING_REPLACE_PACKAGE = "spoon.generating.replace";
public static final String GENERATING_REPLACE_VISITOR = GENERATING_REPLACE_PACKAGE + ".ReplacementVisitor";
private final Map<String, CtClass<?>> listeners = new HashMap<>();
private final CtClass<Object> target;
private final CtExecutableReference<?> element;
private final CtExecutableReference<?> list;
private final CtExecutableReference<?> map;
private final CtExecutableReference<?> set;
public ReplaceScanner(CtClass<Object> target) {
this.target = target;
this.element = target.getMethodsByName("replaceElementIfExist").get(0).getReference();
this.list = target.getMethodsByName("replaceInListIfExist").get(0).getReference();
this.map = target.getMethodsByName("replaceInMapIfExist").get(0).getReference();
this.set = target.getMethodsByName("replaceInSetIfExist").get(0).getReference();
}
@Override
public <T> void visitCtMethod(CtMethod<T> element) {
if (!element.getSimpleName().startsWith("visitCt")) {
return;
}
Factory factory = element.getFactory();
CtMethod<T> clone = element.clone();
factory.Annotation().annotate(clone, Override.class);
clone.getBody().getStatements().clear();
for (int i = 1; i < element.getBody().getStatements().size() - 1; i++) {
CtInvocation<?> inv = element.getBody().getStatement(i);
List<CtExpression<?>> invArgs = new ArrayList<>(inv.getArguments());
if (invArgs.size() <= 1) {
throw new RuntimeException("You forget the role argument in line " + i + " of method " + element.getSimpleName() + " from " + element.getDeclaringType().getQualifiedName());
}
//remove role argument
invArgs.remove(0);
CtInvocation<?> getter = (CtInvocation<?>) invArgs.get(0);
if (clone.getComments().isEmpty()) {
// Add auto-generated comment.
final CtComment comment = factory.Core().createComment();
comment.setCommentType(CtComment.CommentType.INLINE);
comment.setContent("auto-generated, see " + ReplacementVisitorGenerator.class.getName());
clone.addComment(comment);
}
Class<?> actualClass = getter.getType().getActualClass();
CtInvocation<?> invocation = createInvocation(factory, element, invArgs, getter, actualClass);
clone.getBody().addStatement(invocation);
}
target.addMethod(clone);
}
private static Set<String> modelCollectionTypes = new HashSet<>(Arrays.asList(ModelList.class.getName(), ElementNameMap.class.getName()));
private <T> CtInvocation<?> createInvocation(Factory factory, CtMethod<T> candidate, List<CtExpression<?>> invArgs, CtInvocation<?> getter, Class<?> getterTypeClass) {
CtInvocation<?> invocation;
Type type;
if (getterTypeClass.equals(Collection.class) || List.class.isAssignableFrom(getterTypeClass)) {
invocation = factory.Code().createInvocation(null, this.list, invArgs);
type = Type.LIST;
} else if (getterTypeClass.equals(Map.class)) {
invocation = factory.Code().createInvocation(null, this.map, invArgs);
type = Type.MAP;
} else if (getterTypeClass.equals(Set.class)) {
invocation = factory.Code().createInvocation(null, this.set, invArgs);
type = Type.SET;
} else {
invocation = factory.Code().createInvocation(null, this.element, invArgs);
type = Type.ELEMENT;
}
// Listener
final String name = getter.getExecutable().getSimpleName().substring(3);
final String listenerName = getter.getExecutable().getDeclaringType().getSimpleName() + name + "ReplaceListener";
CtClass<?> listener;
if (listeners.containsKey(listenerName)) {
listener = listeners.get(listenerName);
} else {
final CtTypeReference<?> getterType = getGetterType(factory, getter);
CtTypeReference<?> setterParamType = getterType;
if (modelCollectionTypes.contains(setterParamType.getQualifiedName())) {
setterParamType = factory.Type().createReference(Collection.class);
}
listener = createListenerClass(factory, listenerName, setterParamType, type);
final CtMethod<?> setter = getSetter(name, getter.getTarget().getType().getDeclaration());
final CtField<?> field = updateField(listener, setter.getDeclaringType().getReference());
updateConstructor(listener, setter.getDeclaringType().getReference());
updateSetter(factory, (CtMethod<?>) listener.getMethodsByName("set").get(0), setterParamType, field, setter);
// Add auto-generated comment.
final CtComment comment = factory.Core().createComment();
comment.setCommentType(CtComment.CommentType.INLINE);
comment.setContent("auto-generated, see " + ReplacementVisitorGenerator.class.getName());
listener.addComment(comment);
listeners.put(listenerName, listener);
}
invocation.addArgument(getConstructorCall(listener, factory.Code().createVariableRead(candidate.getParameters().get(0).getReference(), false)));
return invocation;
}
private CtTypeReference<?> getGetterType(Factory factory, CtInvocation<?> getter) {
CtTypeReference<?> getterType;
final CtTypeReference<?> type = getter.getType();
if (type instanceof CtTypeParameterReference) {
getterType = getTypeFromTypeParameterReference((CtTypeParameterReference) getter.getExecutable().getDeclaration().getType());
} else {
getterType = type.clone();
}
getterType.getActualTypeArguments().clear();
return getterType;
}
private CtTypeReference<?> getTypeFromTypeParameterReference(CtTypeParameterReference ctTypeParameterRef) {
final CtMethod<?> parentMethod = ctTypeParameterRef.getParent(CtMethod.class);
for (CtTypeParameter formal : parentMethod.getFormalCtTypeParameters()) {
if (formal.getSimpleName().equals(ctTypeParameterRef.getSimpleName())) {
return ((CtTypeParameterReference) formal).getBoundingType();
}
}
final CtInterface<?> parentInterface = ctTypeParameterRef.getParent(CtInterface.class);
for (CtTypeParameter formal : parentInterface.getFormalCtTypeParameters()) {
if (formal.getSimpleName().equals(ctTypeParameterRef.getSimpleName())) {
return formal.getReference().getBoundingType();
}
}
throw new SpoonException("Can't get the type of the CtTypeParameterReference " + ctTypeParameterRef);
}
private CtClass<?> createListenerClass(Factory factory, String listenerName, CtTypeReference<?> getterType, Type type) {
CtClass<?> listener;
// prototype class to use, we'll change its name and code later
listener = Launcher.parseClass("static class XXX implements ReplaceListener<CtElement> { \n"
+ "private final CtElement element XXX(CtElement element) { this.element = element; }\n"
+ "@java.lang.Override public void set(CtElement replace) {}\n"
+ "}");
listener.setSimpleName(listenerName);
target.addNestedType(listener);
final List<CtTypeReference<?>> references = listener.getElements(new TypeFilter<CtTypeReference<?>>(CtTypeReference.class) {
@Override
public boolean matches(CtTypeReference<?> reference) {
return (TARGET_REPLACE_PACKAGE + ".CtListener").equals(reference.getQualifiedName());
}
});
for (CtTypeReference<?> reference : references) {
reference.setPackage(listener.getPackage().getReference());
}
final CtTypeReference<Object> theInterface = factory.Class().createReference(TARGET_REPLACE_PACKAGE + "." + type.name);
theInterface.addActualTypeArgument(getterType);
final Set<CtTypeReference<?>> interfaces = new HashSet<>();
interfaces.add(theInterface);
listener.setSuperInterfaces(interfaces);
return listener;
}
private CtParameter<?> updateConstructor(CtClass<?> listener, CtTypeReference<?> type) {
final CtConstructor<?> ctConstructor = (CtConstructor<?>) listener.getConstructors().toArray(new CtConstructor[listener.getConstructors().size()])[0];
CtAssignment<?,?> assign = (CtAssignment<?,?>) ctConstructor.getBody().getStatement(1);
CtThisAccess<?> fieldAccess = (CtThisAccess<?>) ((CtFieldAccess<?>) assign.getAssigned()).getTarget();
((CtTypeAccess<?>) fieldAccess.getTarget()).getAccessedType().setImplicit(true);
final CtParameter<?> aParameter = (CtParameter<?>) ctConstructor.getParameters().get(0);
aParameter.setType(type);
return aParameter;
}
private CtField<?> updateField(CtClass<?> listener, CtTypeReference<?> type) {
final CtField<?> field = listener.getField("element");
field.setType(type);
return field;
}
private void updateSetter(Factory factory, CtMethod<?> setListener, CtTypeReference<?> getterType, CtField<?> field, CtMethod<?> setter) {
setListener.getParameters().get(0).setType(getterType);
CtInvocation<?> ctInvocation = factory.Code().createInvocation(//
factory.Code().createVariableRead(field.getReference(), false), //
setter.getReference(), //
factory.Code().createVariableRead(setListener.getParameters().get(0).getReference(), false) //
);
CtBlock<?> ctBlock = factory.Code().createCtBlock(ctInvocation);
setListener.setBody(ctBlock);
}
private CtMethod<?> getSetter(String name, CtType<?> declaration) {
Set<CtMethod<?>> allMethods = declaration.getAllMethods();
CtMethod<?> setter = null;
for (CtMethod<?> aMethod : allMethods) {
if (("set" + name).equals(aMethod.getSimpleName())) {
setter = aMethod;
break;
}
}
return setter;
}
private CtConstructorCall<?> getConstructorCall(CtClass<?> listener, CtExpression<?> argument) {
return listener.getFactory().Code().createConstructorCall(listener.getReference(), argument);
}
enum Type {
ELEMENT("ReplaceListener"), LIST("ReplaceListListener"), SET("ReplaceSetListener"), MAP("ReplaceMapListener");
String name;
Type(String name) {
this.name = name;
}
}
}