Mercurial > hg > openjdk > jigsaw > nashorn
view src/jdk/nashorn/internal/ir/TernaryNode.java @ 143:4be452026847
8010652: Eliminate non-child references in Block/FunctionNode, and make few node types immutable
Reviewed-by: jlaskey, lagergren
author | attila |
---|---|
date | Sat, 23 Mar 2013 00:58:39 +0100 |
parents | a971adb68f38 |
children |
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/* * 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 jdk.nashorn.internal.ir.visitor.NodeVisitor; import jdk.nashorn.internal.runtime.Source; /** * TernaryNode nodes represent three operand operations (?:). */ public class TernaryNode extends BinaryNode { /** Third argument. */ private Node third; /** * Constructor * * @param source the source * @param token token * @param lhs left hand side node * @param rhs right hand side node * @param third third node */ public TernaryNode(final Source source, final long token, final Node lhs, final Node rhs, final Node third) { super(source, token, lhs, rhs); this.finish = third.getFinish(); this.third = third; } private TernaryNode(final TernaryNode ternaryNode, final CopyState cs) { super(ternaryNode, cs); this.third = cs.existingOrCopy(ternaryNode.third); } @Override protected Node copy(final CopyState cs) { return new TernaryNode(this, cs); } @Override public boolean equals(final Object other) { if (!super.equals(other)) { return false; } return third.equals(((TernaryNode)other).third()); } @Override public int hashCode() { return super.hashCode() ^ third().hashCode(); } @Override public Node accept(final NodeVisitor visitor) { if (visitor.enterTernaryNode(this) != null) { final Node newLhs = lhs().accept(visitor); final Node newRhs = rhs().accept(visitor); final Node newThird = third.accept(visitor); return visitor.leaveTernaryNode((TernaryNode)setThird(newThird).setLHS(newLhs).setRHS(newRhs)); } return this; } @Override public void toString(final StringBuilder sb) { final boolean lhsParen = tokenType().needsParens(lhs().tokenType(), true); final boolean rhsParen = tokenType().needsParens(rhs().tokenType(), false); final boolean thirdParen = tokenType().needsParens(third().tokenType(), false); if (lhsParen) { sb.append('('); } lhs().toString(sb); if (lhsParen) { sb.append(')'); } sb.append(" ? "); if (rhsParen) { sb.append('('); } rhs().toString(sb); if (rhsParen) { sb.append(')'); } sb.append(" : "); if (thirdParen) { sb.append('('); } third().toString(sb); if (thirdParen) { sb.append(')'); } } /** * Get the "third" node for this ternary expression, i.e. "z" in x ? y : z * @return a node */ public Node third() { return third; } /** * Reset the "third" node for this ternary expression, i.e. "z" in x ? y : z * @param third a node * @return a node equivalent to this one except for the requested change. */ public TernaryNode setThird(final Node third) { if(this.third == third) return this; final TernaryNode n = (TernaryNode)clone(); n.third = third; return n; } }