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package org.zwobble.couscous.ast.structure;
import org.zwobble.couscous.ast.*;
import org.zwobble.couscous.ast.visitors.NodeMapper;
import java.util.Collection;
import java.util.function.Predicate;
import java.util.stream.Stream;
import static org.zwobble.couscous.util.ExtraStreams.concatStreams;
public class NodeStructure {
public static Stream<? extends Node> descendantNodesAndSelf(Node node, Predicate<Node> predicate) {
return Stream.concat(Stream.of(node), descendantNodes(node, predicate));
}
public static Stream<? extends Node> descendantNodes(Node node, Predicate<Node> predicate) {
return childNodes(node)
.filter(predicate)
.flatMap(child -> descendantNodesAndSelf(child, predicate));
}
public static Stream<? extends Node> descendantNodesAndSelf(Node node) {
return Stream.concat(Stream.of(node), descendantNodes(node));
}
public static Stream<? extends Node> descendantNodes(Node node) {
return childNodes(node).flatMap(NodeStructure::descendantNodesAndSelf);
}
public static Stream<? extends Node> childNodes(Node node) {
// TODO: is this just duplicating the logic already in node.transform?
return node.accept(new NodeMapper<Stream<? extends Node>>() {
@Override
public Stream<Node> visit(LiteralNode literal) {
return Stream.empty();
}
@Override
public Stream<Node> visit(VariableReferenceNode variableReference) {
return Stream.empty();
}
@Override
public Stream<Node> visit(ThisReferenceNode reference) {
return Stream.empty();
}
@Override
public Stream<? extends Node> visit(ArrayNode array) {
return array.getElements().stream();
}
@Override
public Stream<Node> visit(AssignmentNode assignment) {
return Stream.of(assignment.getValue(), assignment.getTarget());
}
@Override
public Stream<Node> visit(TernaryConditionalNode ternaryConditional) {
return Stream.of(
ternaryConditional.getCondition(),
ternaryConditional.getIfTrue(),
ternaryConditional.getIfFalse());
}
@Override
public Stream<Node> visit(MethodCallNode methodCall) {
return Stream.concat(
Stream.of(methodCall.getReceiver()),
methodCall.getArguments().stream());
}
@Override
public Stream<? extends ExpressionNode> visit(ConstructorCallNode call) {
return call.getArguments().stream();
}
@Override
public Stream<? extends Node> visit(OperationNode operation) {
return operation.getArguments().stream();
}
@Override
public Stream<? extends Node> visit(InstanceOfNode instanceOf) {
return Stream.of(instanceOf.getLeft());
}
@Override
public Stream<Node> visit(FieldAccessNode fieldAccess) {
return Stream.of(fieldAccess.getLeft());
}
@Override
public Stream<? extends Node> visit(TypeCoercionNode typeCoercion) {
return Stream.of(typeCoercion.getExpression());
}
@Override
public Stream<? extends Node> visit(CastNode cast) {
return Stream.of(cast.getExpression());
}
@Override
public Stream<? extends Node> visit(InstanceReceiver receiver) {
return Stream.of(receiver.getExpression());
}
@Override
public Stream<? extends Node> visit(StaticReceiver receiver) {
return Stream.empty();
}
@Override
public Stream<Node> visit(ReturnNode returnNode) {
return Stream.of(returnNode.getValue());
}
@Override
public Stream<? extends Node> visit(ThrowNode throwNode) {
return Stream.of(throwNode.getValue());
}
@Override
public Stream<Node> visit(ExpressionStatementNode expressionStatement) {
return Stream.of(expressionStatement.getExpression());
}
@Override
public Stream<Node> visit(LocalVariableDeclarationNode localVariableDeclaration) {
return Stream.of(localVariableDeclaration.getInitialValue());
}
@Override
public Stream<Node> visit(IfStatementNode ifStatement) {
return concatStreams(
Stream.of(ifStatement.getCondition()),
ifStatement.getTrueBranch().stream(),
ifStatement.getFalseBranch().stream());
}
@Override
public Stream<Node> visit(WhileNode whileLoop) {
return Stream.concat(
Stream.of(whileLoop.getCondition()),
whileLoop.getBody().stream());
}
@Override
public Stream<? extends Node> visit(TryNode tryStatement) {
return Stream.concat(
tryStatement.getBody().stream(),
tryStatement.getExceptionHandlers().stream().flatMap(handler -> handler.getBody().stream()));
}
@Override
public Stream<? extends Node> visit(FormalTypeParameterNode parameter) {
return Stream.empty();
}
@Override
public Stream<? extends Node> visit(FormalArgumentNode formalArgumentNode) {
return Stream.empty();
}
@Override
public Stream<? extends Node> visit(AnnotationNode annotation) {
return Stream.empty();
}
@Override
public Stream<Node> visit(ClassNode classNode) {
return concatStreams(
Stream.of(classNode.getConstructor()),
classNode.getFields().stream(),
classNode.getMethods().stream());
}
@Override
public Stream<? extends Node> visit(InterfaceNode interfaceNode) {
return interfaceNode.getMethods().stream();
}
@Override
public Stream<? extends Node> visit(EnumNode enumNode) {
return Stream.empty();
}
@Override
public Stream<Node> visit(MethodNode methodNode) {
return concatStreams(
methodNode.getAnnotations().stream(),
methodNode.getArguments().stream(),
methodNode.getBody().map(Collection::stream).orElse(Stream.empty()));
}
@Override
public Stream<Node> visit(ConstructorNode constructorNode) {
return Stream.concat(constructorNode.getArguments().stream(), constructorNode.getBody().stream());
}
@Override
public Stream<? extends Node> visit(FieldDeclarationNode declaration) {
return Stream.empty();
}
});
}
}
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