r/org.eclipse.statet.r.core/src/org/eclipse/statet/r/core/rsource/ast/SpecList.java

/*=============================================================================#
 # Copyright (c) 2007, 2019 Stephan Wahlbrink and others.
 # 
 # This program and the accompanying materials are made available under the
 # terms of the Eclipse Public License 2.0 which is available at
 # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
 # which is available at https://www.apache.org/licenses/LICENSE-2.0.
 # 
 # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
 # 
 # Contributors:
 #     Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation
 #=============================================================================*/

package org.eclipse.statet.r.core.rsource.ast;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.statet.jcommons.lang.NonNull;
import org.eclipse.statet.jcommons.lang.NonNullByDefault;
import org.eclipse.statet.jcommons.lang.Nullable;

import org.eclipse.statet.ltk.ast.core.AstNode;
import org.eclipse.statet.ltk.ast.core.AstVisitor;
import org.eclipse.statet.r.core.rlang.RTerminal;


/**
 * Comma separated list
 */
@NonNullByDefault
abstract class SpecList extends RAstNode {
	
	
	final List<SpecItem> specs= new ArrayList<>(0);
	
	
	protected SpecList() {
	}
	
	
	@Override
	public final @Nullable RTerminal getOperator(final int index) {
		return null;
	}
	
	
	@Override
	public final boolean hasChildren() {
		return (!this.specs.isEmpty());
	}
	
	@Override
	public final int getChildCount() {
		return this.specs.size();
	}
	
	@Override
	public final RAstNode getChild(final int index) {
		return this.specs.get(index);
	}
	
	@Override
	public final RAstNode[] getChildren() {
		return this.specs.toArray(new @NonNull RAstNode[this.specs.size()]);
	}
	
	@Override
	public final int getChildIndex(final AstNode child) {
		for (int i= this.specs.size() - 1; i >= 0; i--) {
			if (this.specs.get(i) == child) {
				return i;
			}
		}
		return -1;
	}
	
	@Override
	public final void acceptInRChildren(final RAstVisitor visitor) throws InvocationTargetException {
		acceptChildren(visitor, this.specs);
	}
	
	@Override
	public final void acceptInChildren(final AstVisitor visitor) throws InvocationTargetException {
		for (final RAstNode child : this.specs) {
			visitor.visit(child);
		}
	}
	
	
	@Override
	final @Nullable Expression getExpr(final RAstNode child) {
		return null;
	}
	
	@Override
	final @Nullable Expression getLeftExpr() {
		return null;
	}
	
	@Override
	final @Nullable Expression getRightExpr() {
		return null;
	}
	
	abstract SpecItem createItem();
	
	void appendItem(final SpecItem item) {
		this.specs.add(item);
	}
	
	
	@Override
	final int getMissingExprStatus(final Expression expr) {
		throw new IllegalArgumentException();
	}
	
	@Override
	final void updateEndOffset() {
	}
	
}