| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.ir; |
| |
| import static jdk.nashorn.internal.parser.TokenType.RETURN; |
| import static jdk.nashorn.internal.parser.TokenType.YIELD; |
| |
| import jdk.nashorn.internal.ir.annotations.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| |
| /** |
| * IR representation for RETURN or YIELD statements. |
| */ |
| @Immutable |
| public class ReturnNode extends Statement { |
| private static final long serialVersionUID = 1L; |
| |
| /** Optional expression. */ |
| private final Expression expression; |
| |
| /** |
| * Constructor |
| * |
| * @param lineNumber line number |
| * @param token token |
| * @param finish finish |
| * @param expression expression to return |
| */ |
| public ReturnNode(final int lineNumber, final long token, final int finish, final Expression expression) { |
| super(lineNumber, token, finish); |
| this.expression = expression; |
| } |
| |
| private ReturnNode(final ReturnNode returnNode, final Expression expression) { |
| super(returnNode); |
| this.expression = expression; |
| } |
| |
| @Override |
| public boolean isTerminal() { |
| return true; |
| } |
| |
| /** |
| * Return true if is a RETURN node. |
| * @return true if is RETURN node. |
| */ |
| public boolean isReturn() { |
| return isTokenType(RETURN); |
| } |
| |
| /** |
| * Check if this return node has an expression |
| * @return true if not a void return |
| */ |
| public boolean hasExpression() { |
| return expression != null; |
| } |
| |
| /** |
| * Return true if is a YIELD node. |
| * @return TRUE if is YIELD node. |
| */ |
| public boolean isYield() { |
| return isTokenType(YIELD); |
| } |
| |
| @Override |
| public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterReturnNode(this)) { |
| if (expression != null) { |
| return visitor.leaveReturnNode(setExpression((Expression)expression.accept(visitor))); |
| } |
| return visitor.leaveReturnNode(this); |
| } |
| |
| return this; |
| } |
| |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printType) { |
| sb.append(isYield() ? "yield" : "return"); |
| if (expression != null) { |
| sb.append(' '); |
| expression.toString(sb, printType); |
| } |
| } |
| |
| /** |
| * Get the expression this node returns |
| * @return return expression, or null if void return |
| */ |
| public Expression getExpression() { |
| return expression; |
| } |
| |
| /** |
| * Reset the expression this node returns |
| * @param expression new expression, or null if void return |
| * @return new or same return node |
| */ |
| public ReturnNode setExpression(final Expression expression) { |
| if (this.expression == expression) { |
| return this; |
| } |
| return new ReturnNode(this, expression); |
| } |
| |
| } |