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package org.zwobble.couscous.transforms;
import com.google.common.collect.Iterables;
import org.zwobble.couscous.ast.*;
import org.zwobble.couscous.ast.visitors.NodeTransformer;
import org.zwobble.couscous.types.ScalarType;
import java.util.*;
import static org.zwobble.couscous.util.ExtraLists.eagerFilter;
import static org.zwobble.couscous.util.ExtraLists.list;
import static org.zwobble.couscous.util.ExtraSets.set;
public class SplitStaticsFromInterface {
public static List<TypeNode> transform(List<TypeNode> typeNodes) {
List<TypeNode> result = new ArrayList<>();
Set<ScalarType> splitInterfaces = new HashSet<>();
for (TypeNode typeNode : typeNodes) {
if (isSplittable(typeNode)) {
splitInterfaces.add(typeNode.getName());
InterfaceNode interfaceNode = (InterfaceNode) typeNode;
result.add(ClassNode.declareClass(
staticTypeFor(interfaceNode.getName()),
list(),
set(),
interfaceNode.getFields(),
interfaceNode.getStaticConstructor(),
ConstructorNode.DEFAULT,
eagerFilter(interfaceNode.getMethods(), method -> method.isStatic()),
list()
));
result.add(InterfaceNode.declareInterface(
interfaceNode.getName(),
interfaceNode.getTypeParameters(),
interfaceNode.getSuperTypes(),
list(),
list(),
eagerFilter(interfaceNode.getMethods(), method -> !method.isStatic()),
interfaceNode.getInnerTypes()
));
} else {
result.add(typeNode);
}
}
NodeTransformer transformer = NodeTransformer.builder()
.transformReceiver((Receiver receiver) -> {
if (receiver instanceof StaticReceiver && splitInterfaces.contains(((StaticReceiver) receiver).getType())) {
return StaticReceiver.staticReceiver(staticTypeFor(((StaticReceiver) receiver).getType()));
} else {
return receiver;
}
})
.build();
return NodeTransformer.apply(transformer, result);
}
private static ScalarType staticTypeFor(ScalarType name) {
return ScalarType.topLevel(name.getQualifiedName() + "_static");
}
private static boolean isSplittable(TypeNode typeNode) {
if (!(typeNode instanceof InterfaceNode)) {
return false;
}
InterfaceNode interfaceNode = (InterfaceNode) typeNode;
return !interfaceNode.getFields().isEmpty() || Iterables.any(interfaceNode.getMethods(), MethodNode::isStatic);
}
}
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