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The ANTLR 4 Runtime (Optimized)

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/*
 * Copyright (c) 2012 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD-3-Clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

package org.antlr.v4.runtime.tree.xpath;

import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.Tree;
import org.antlr.v4.runtime.tree.Trees;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class XPathWildcardElement extends XPathElement {
	public XPathWildcardElement() {
		super(XPath.WILDCARD);
	}

	@Override
	public Collection evaluate(final ParseTree t) {
		if ( invert ) return new ArrayList(); // !* is weird but valid (empty)
		List kids = new ArrayList();
		for (Tree c : Trees.getChildren(t)) {
			kids.add((ParseTree)c);
		}
		return kids;
	}
}