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package lombok.eclipse.agent;
import static lombok.eclipse.Eclipse.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import org.eclipse.jdt.internal.compiler.CompilationResult;
import org.eclipse.jdt.internal.compiler.ast.ASTNode;
import org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.ast.Argument;
import org.eclipse.jdt.internal.compiler.ast.ArrayInitializer;
import org.eclipse.jdt.internal.compiler.ast.ClassLiteralAccess;
import org.eclipse.jdt.internal.compiler.ast.Clinit;
import org.eclipse.jdt.internal.compiler.ast.Expression;
import org.eclipse.jdt.internal.compiler.ast.FieldDeclaration;
import org.eclipse.jdt.internal.compiler.ast.FieldReference;
import org.eclipse.jdt.internal.compiler.ast.MemberValuePair;
import org.eclipse.jdt.internal.compiler.ast.MessageSend;
import org.eclipse.jdt.internal.compiler.ast.MethodDeclaration;
import org.eclipse.jdt.internal.compiler.ast.ReturnStatement;
import org.eclipse.jdt.internal.compiler.ast.SingleNameReference;
import org.eclipse.jdt.internal.compiler.ast.SingleTypeReference;
import org.eclipse.jdt.internal.compiler.ast.Statement;
import org.eclipse.jdt.internal.compiler.ast.ThisReference;
import org.eclipse.jdt.internal.compiler.ast.TypeDeclaration;
import org.eclipse.jdt.internal.compiler.ast.TypeReference;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileConstants;
import org.eclipse.jdt.internal.compiler.lookup.ArrayBinding;
import org.eclipse.jdt.internal.compiler.lookup.ClassScope;
import org.eclipse.jdt.internal.compiler.lookup.MethodBinding;
import org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeBinding;
import org.eclipse.jdt.internal.compiler.lookup.TypeConstants;
import lombok.eclipse.Eclipse;
import lombok.eclipse.handlers.EclipseHandlerUtil;
import lombok.patcher.Hook;
import lombok.patcher.MethodTarget;
import lombok.patcher.ScriptManager;
import lombok.patcher.StackRequest;
import lombok.patcher.scripts.ScriptBuilder;
public class PatchDelegate {
static void addPatches(ScriptManager sm, boolean ecj) {
final String CLASSSCOPE_SIG = "org.eclipse.jdt.internal.compiler.lookup.ClassScope";
sm.addScript(ScriptBuilder.exitEarly()
.target(new MethodTarget(CLASSSCOPE_SIG, "buildFieldsAndMethods", "void"))
.request(StackRequest.THIS)
.decisionMethod(new Hook(PatchDelegate.class.getName(), "handleDelegateForType", "boolean", CLASSSCOPE_SIG))
.build());
}
public static boolean handleDelegateForType(ClassScope scope) {
TypeDeclaration decl = scope.referenceContext;
if (decl == null) return false;
if (decl.fields != null) for (FieldDeclaration field : decl.fields) {
if (field.annotations == null) continue;
for (Annotation ann : field.annotations) {
if (ann.type == null) continue;
TypeBinding tb = ann.type.resolveType(decl.initializerScope);
if (!charArrayEquals("lombok", tb.qualifiedPackageName())) continue;
if (!charArrayEquals("Delegate", tb.qualifiedSourceName())) continue;
List<ClassLiteralAccess> rawTypes = new ArrayList<ClassLiteralAccess>();
for (MemberValuePair pair : ann.memberValuePairs()) {
if (pair.name == null || charArrayEquals("value", pair.name)) {
if (pair.value instanceof ArrayInitializer) {
for (Expression expr : ((ArrayInitializer)pair.value).expressions) {
if (expr instanceof ClassLiteralAccess) rawTypes.add((ClassLiteralAccess) expr);
}
}
if (pair.value instanceof ClassLiteralAccess) {
rawTypes.add((ClassLiteralAccess) pair.value);
}
}
}
List<MethodBinding> methodsToDelegate = new ArrayList<MethodBinding>();
if (rawTypes.isEmpty()) {
addAllMethodBindings(methodsToDelegate, field.type.resolveType(decl.initializerScope));
} else {
for (ClassLiteralAccess cla : rawTypes) {
addAllMethodBindings(methodsToDelegate, cla.type.resolveType(decl.initializerScope));
}
}
generateDelegateMethods(decl, methodsToDelegate, field.name, ann);
}
}
return false;
}
private static void generateDelegateMethods(TypeDeclaration type, List<MethodBinding> methods, char[] delegate, ASTNode source) {
for (MethodBinding binding : methods) {
MethodDeclaration method = generateDelegateMethod(delegate, binding, type.compilationResult, source);
if (type.methods == null) {
type.methods = new AbstractMethodDeclaration[1];
type.methods[0] = method;
} else {
int insertionPoint;
for (insertionPoint = 0; insertionPoint < type.methods.length; insertionPoint++) {
AbstractMethodDeclaration current = type.methods[insertionPoint];
if (current instanceof Clinit) continue;
if (Eclipse.isGenerated(current)) continue;
break;
}
AbstractMethodDeclaration[] newArray = new AbstractMethodDeclaration[type.methods.length + 1];
System.arraycopy(type.methods, 0, newArray, 0, insertionPoint);
if (insertionPoint <= type.methods.length) {
System.arraycopy(type.methods, insertionPoint, newArray, insertionPoint + 1, type.methods.length - insertionPoint);
}
newArray[insertionPoint] = method;
type.methods = newArray;
}
}
}
private static MethodDeclaration generateDelegateMethod(char[] name, MethodBinding binding, CompilationResult compilationResult, ASTNode source) {
MethodDeclaration method = new MethodDeclaration(compilationResult);
Eclipse.setGeneratedBy(method, source);
method.modifiers = ClassFileConstants.AccPublic;
method.returnType = Eclipse.makeType(binding.returnType, source, false);
method.annotations = EclipseHandlerUtil.createSuppressWarningsAll(source, null);
if (binding.parameters != null && binding.parameters.length > 0) {
method.arguments = new Argument[binding.parameters.length];
for (int i = 0; i < method.arguments.length; i++) {
String argName = "$p" + i;
method.arguments[i] = new Argument(
argName.toCharArray(), pos(source),
Eclipse.makeType(binding.parameters[i], source, false),
ClassFileConstants.AccFinal);
}
}
method.selector = binding.selector;
if (binding.thrownExceptions != null && binding.thrownExceptions.length > 0) {
method.thrownExceptions = new TypeReference[binding.thrownExceptions.length];
for (int i = 0; i < method.thrownExceptions.length; i++) {
method.thrownExceptions[i] = Eclipse.makeType(binding.thrownExceptions[i], source, false);
}
}
method.typeParameters = null; // TODO think about this
method.bits |= ECLIPSE_DO_NOT_TOUCH_FLAG;
FieldReference fieldRef = new FieldReference(name, pos(source));
fieldRef.receiver = new ThisReference(source.sourceStart, source.sourceEnd);
MessageSend call = new MessageSend();
call.receiver = fieldRef;
call.selector = binding.selector;
if (method.arguments != null) {
call.arguments = new Expression[method.arguments.length];
for (int i = 0; i < method.arguments.length; i++) {
call.arguments[i] = new SingleNameReference(("$p" + i).toCharArray(), pos(source));
}
}
Statement body;
if (method.returnType instanceof SingleTypeReference && ((SingleTypeReference)method.returnType).token == TypeConstants.VOID) {
body = call;
} else {
body = new ReturnStatement(call, source.sourceStart, source.sourceEnd);
}
method.statements = new Statement[] {body};
// TODO add Eclipse.setGeneratedBy everywhere.
method.bodyStart = method.declarationSourceStart = method.sourceStart = source.sourceStart;
method.bodyEnd = method.declarationSourceEnd = method.sourceEnd = source.sourceEnd;
return method;
}
private static void addAllMethodBindings(List<MethodBinding> list, TypeBinding binding) {
List<String> ban = new ArrayList<String>();
ban.addAll(METHODS_IN_OBJECT);
addAllMethodBindings(list, binding, ban);
}
private static void addAllMethodBindings(List<MethodBinding> list, TypeBinding binding, List<String> banList) {
if (binding == null) return;
if (binding instanceof ReferenceBinding) {
ReferenceBinding rb = (ReferenceBinding) binding;
for (MethodBinding mb : rb.availableMethods()) {
if (mb.isStatic()) continue;
if (mb.isBridge()) continue;
if (mb.isConstructor()) continue;
if (mb.isDefaultAbstract()) continue;
if (!mb.isPublic()) continue;
if (mb.isSynthetic()) continue;
if (mb.isFinal()) {
banList.add(printSig(mb));
continue;
}
if (banList.contains(printSig(mb))) continue;
list.add(mb);
}
addAllMethodBindings(list, rb.superclass());
ReferenceBinding[] interfaces = rb.superInterfaces();
if (interfaces != null) {
for (ReferenceBinding iface : interfaces) addAllMethodBindings(list, iface);
}
}
}
private static final List<String> METHODS_IN_OBJECT = Collections.unmodifiableList(Arrays.asList(
"hashCode()",
"equals(java.lang.Object)",
"wait()",
"wait(long)",
"wait(long, int)",
"notify()",
"notifyAll()",
"toString()",
"getClass()",
"clone()",
"finalize()"));
private static String printSig(MethodBinding binding) {
StringBuilder signature = new StringBuilder();
signature.append(binding.selector);
signature.append("(");
boolean first = true;
if (binding.parameters != null) for (TypeBinding param : binding.parameters) {
if (!first) signature.append(", ");
first = false;
signature.append(simpleTypeBindingToString(param));
}
signature.append(")");
return signature.toString();
}
private static String simpleTypeBindingToString(TypeBinding binding) {
binding = binding.erasure();
if (binding != null && binding.isBaseType()) {
return new String (binding.sourceName());
} else if (binding instanceof ReferenceBinding) {
String pkg = binding.qualifiedPackageName() == null ? "" : new String(binding.qualifiedPackageName());
String qsn = binding.qualifiedSourceName() == null ? "" : new String(binding.qualifiedSourceName());
return pkg.isEmpty() ? qsn : (pkg + "." + qsn);
} else if (binding instanceof ArrayBinding) {
StringBuilder out = new StringBuilder();
out.append(binding.leafComponentType());
for (int i = 0; i < binding.dimensions(); i++) out.append("[]");
return out.toString();
}
return "";
}
private static boolean charArrayEquals(String s, char[] c) {
if (s == null) return c == null;
if (c == null) return false;
if (s.length() != c.length) return false;
for (int i = 0; i < s.length(); i++) if (s.charAt(i) != c[i]) return false;
return true;
}
}
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