/*
 * Copyright © 2024 Apple Inc. and the Pkl project authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.pkl.core.ast.expression.primary;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.source.SourceSection;
import org.pkl.core.ast.ExpressionNode;
import org.pkl.core.runtime.VmUtils;

// TODO: should `outer.x` work like `super.x`? (start search in enclosing scope)
// TODO: if enclosing scope is lambda scope, can't use `lambda.x` to access lambda param `x`
@NodeInfo(shortName = "outer")
public final class OuterNode extends ExpressionNode {

  public OuterNode(SourceSection sourceSection) {
    super(sourceSection);
  }

  @Override
  public Object executeGeneric(VirtualFrame frame) {
    var outer = VmUtils.getOwner(frame).getEnclosingReceiver();
    if (outer == null) {
      CompilerDirectives.transferToInterpreter();
      throw exceptionBuilder().evalError("noOuterScope").build();
    }
    return outer;
  }
}
