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package oml.ast.transformers;
import com.strobel.assembler.metadata.MemberReference;
import com.strobel.assembler.metadata.MetadataFilters;
import com.strobel.assembler.metadata.MetadataHelper;
import com.strobel.assembler.metadata.MethodBinder;
import com.strobel.assembler.metadata.MethodDefinition;
import com.strobel.assembler.metadata.MethodReference;
import com.strobel.assembler.metadata.TypeReference;
import com.strobel.core.StringUtilities;
import com.strobel.core.VerifyArgument;
import com.strobel.decompiler.DecompilerContext;
import com.strobel.decompiler.languages.java.ast.ArrayCreationExpression;
import com.strobel.decompiler.languages.java.ast.ArrayInitializerExpression;
import com.strobel.decompiler.languages.java.ast.AstNode;
import com.strobel.decompiler.languages.java.ast.AstNodeCollection;
import com.strobel.decompiler.languages.java.ast.CastExpression;
import com.strobel.decompiler.languages.java.ast.ContextTrackingVisitor;
import com.strobel.decompiler.languages.java.ast.DepthFirstAstVisitor;
import com.strobel.decompiler.languages.java.ast.Expression;
import com.strobel.decompiler.languages.java.ast.InvocationExpression;
import com.strobel.decompiler.languages.java.ast.JavaResolver;
import com.strobel.decompiler.languages.java.ast.Keys;
import com.strobel.decompiler.languages.java.ast.MemberReferenceExpression;
import com.strobel.decompiler.languages.java.ast.ObjectCreationExpression;
import com.strobel.decompiler.languages.java.ast.transforms.IAstTransform;
import com.strobel.decompiler.semantics.ResolveResult;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Thiakil on 12/07/2018.
*/
public class VaragsFixer implements IAstTransform {
private final DecompilerContext _context;
public VaragsFixer(final DecompilerContext context) {
_context = VerifyArgument.notNull(context, "context");
}
@Override
public void run(AstNode compilationUnit) {
compilationUnit.acceptVisitor(new Visitor(_context), null);
}
class Visitor extends ContextTrackingVisitor<Void> {
private final JavaResolver _resolver;
protected Visitor(DecompilerContext context) {
super(context);
_resolver = new JavaResolver(context);
}
//remove `new Object[0]` on varagrs as the normal tranformer doesnt do them
@Override
public Void visitInvocationExpression(InvocationExpression node, Void data) {
super.visitInvocationExpression(node, data);
MemberReference definition = node.getUserData(Keys.MEMBER_REFERENCE);
if (definition instanceof MethodDefinition && ((MethodDefinition) definition).isVarArgs()){
AstNodeCollection<Expression> arguments = node.getArguments();
Expression lastParam = arguments.lastOrNullObject();
if (!lastParam.isNull() && lastParam instanceof ArrayCreationExpression){
ArrayCreationExpression varargArray = (ArrayCreationExpression)lastParam;
if (varargArray.getInitializer().isNull() || varargArray.getInitializer().getElements().isEmpty()){
lastParam.remove();
} else {
for (Expression e : varargArray.getInitializer().getElements()){
arguments.insertBefore(varargArray, e.clone());
}
varargArray.remove();
}
}
}
return null;
}
//applies the vararg transform to object creation
@Override
public Void visitObjectCreationExpression(ObjectCreationExpression node, Void data) {
super.visitObjectCreationExpression(node, data);
final AstNodeCollection<Expression> arguments = node.getArguments();
final Expression lastArgument = arguments.lastOrNullObject();
Expression arrayArg = lastArgument;
if (arrayArg instanceof CastExpression)
arrayArg = ((CastExpression) arrayArg).getExpression();
if (arrayArg == null ||
arrayArg.isNull() ||
!(arrayArg instanceof ArrayCreationExpression &&
node.getTarget() instanceof MemberReferenceExpression)) {
return null;
}
final ArrayCreationExpression newArray = (ArrayCreationExpression) arrayArg;
final MemberReferenceExpression target = (MemberReferenceExpression) node.getTarget();
if (!newArray.getAdditionalArraySpecifiers().hasSingleElement()) {
return null;
}
final MethodReference method = (MethodReference) node.getUserData(Keys.MEMBER_REFERENCE);
if (method == null) {
return null;
}
final MethodDefinition resolved = method.resolve();
if (resolved == null || !resolved.isVarArgs()) {
return null;
}
final List<MethodReference> candidates;
final Expression invocationTarget = target.getTarget();
if (invocationTarget == null || invocationTarget.isNull()) {
candidates = MetadataHelper.findMethods(
context.getCurrentType(),
MetadataFilters.matchName(resolved.getName())
);
}
else {
final ResolveResult targetResult = _resolver.apply(invocationTarget);
if (targetResult == null || targetResult.getType() == null) {
return null;
}
candidates = MetadataHelper.findMethods(
targetResult.getType(),
MetadataFilters.matchName(resolved.getName())
);
}
final List<TypeReference> argTypes = new ArrayList<>();
for (final Expression argument : arguments) {
final ResolveResult argResult = _resolver.apply(argument);
if (argResult == null || argResult.getType() == null) {
return null;
}
argTypes.add(argResult.getType());
}
final MethodBinder.BindResult c1 = MethodBinder.selectMethod(candidates, argTypes);
if (c1.isFailure() || c1.isAmbiguous()) {
return null;
}
argTypes.remove(argTypes.size() - 1);
final ArrayInitializerExpression initializer = newArray.getInitializer();
final boolean hasElements = !initializer.isNull() && !initializer.getElements().isEmpty();
if (hasElements) {
for (final Expression argument : initializer.getElements()) {
final ResolveResult argResult = _resolver.apply(argument);
if (argResult == null || argResult.getType() == null) {
return null;
}
argTypes.add(argResult.getType());
}
}
final MethodBinder.BindResult c2 = MethodBinder.selectMethod(candidates, argTypes);
if (c2.isFailure() ||
c2.isAmbiguous() ||
!StringUtilities.equals(c2.getMethod().getErasedSignature(), c1.getMethod().getErasedSignature())) {
return null;
}
lastArgument.remove();
if (!hasElements) {
lastArgument.remove();
return null;
}
for (final Expression newArg : initializer.getElements()) {
newArg.remove();
arguments.add(newArg);
}
return null;
}
}
}
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