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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.annotations.Immutable;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
import jdk.nashorn.internal.runtime.Source;
/**
* TernaryNode nodes represent three operand operations (?:).
*/
@Immutable
public final class TernaryNode extends Node {
private final Node lhs;
private final Node rhs;
/** Third argument. */
private final 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, third.getFinish());
this.lhs = lhs;
this.rhs = rhs;
this.third = third;
}
private TernaryNode(final TernaryNode ternaryNode, final Node lhs, final Node rhs, final Node third) {
super(ternaryNode);
this.lhs = lhs;
this.rhs = rhs;
this.third = third;
}
@Override
public Node accept(final NodeVisitor visitor) {
if (visitor.enterTernaryNode(this)) {
final Node newLhs = lhs().accept(visitor);
final Node newRhs = rhs().accept(visitor);
final Node newThird = third.accept(visitor);
return visitor.leaveTernaryNode(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 lhs node for this ternary expression, i.e. "x" in x ? y : z
* @return a node
*/
public Node lhs() {
return lhs;
}
/**
* Get the rhs node for this ternary expression, i.e. "y" in x ? y : z
* @return a node
*/
public Node rhs() {
return rhs;
}
/**
* Get the "third" node for this ternary expression, i.e. "z" in x ? y : z
* @return a node
*/
public Node third() {
return third;
}
/**
* Set the left hand side expression for this node
* @param lhs new left hand side expression
* @return a node equivalent to this one except for the requested change.
*/
public TernaryNode setLHS(final Node lhs) {
if (this.lhs == lhs) {
return this;
}
return new TernaryNode(this, lhs, rhs, third);
}
/**
* Set the right hand side expression for this node
* @param rhs new left hand side expression
* @return a node equivalent to this one except for the requested change.
*/
public TernaryNode setRHS(final Node rhs) {
if (this.rhs == rhs) {
return this;
}
return new TernaryNode(this, lhs, rhs, 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;
}
return new TernaryNode(this, lhs, rhs, third);
}
}
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