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Truffle SL is an example language implemented using the Truffle API.
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/*
 * Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * SOFTWARE.
 */
package com.oracle.truffle.sl.nodes.expression;

import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.NodeInfo;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.sl.nodes.SLExpressionNode;

/**
 * A {@link SLExpressionNode} that represents a parenthesized expression; it simply returns the
 * value of the enclosed (child) expression. It is represented separately in the AST for the purpose
 * of correct source attribution; this preserves the lexical relationship between the two
 * parentheses and allows a tool to describe the expression as distinct from its contents.
 */
@NodeInfo(description = "A parenthesized expression")
public class SLParenExpressionNode extends SLExpressionNode {

    @Child private SLExpressionNode expression;

    public SLParenExpressionNode(SLExpressionNode expression) {
        this.expression = expression;
    }

    @Override
    public Object executeGeneric(VirtualFrame frame) {
        return expression.executeGeneric(frame);
    }

    @Override
    public long executeLong(VirtualFrame frame) throws UnexpectedResultException {
        return expression.executeLong(frame);
    }

    @Override
    public boolean executeBoolean(VirtualFrame frame) throws UnexpectedResultException {
        return expression.executeBoolean(frame);
    }
}