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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.codegen.Label;
import jdk.nashorn.internal.ir.annotations.Immutable;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
/**
* IR representation of CASE clause.
* Case nodes are not BreakableNodes, but the SwitchNode is
*/
@Immutable
public final class CaseNode extends Node {
/** Test expression. */
private final Expression test;
/** Statements. */
private final Block body;
/** Case entry label. */
private final Label entry;
/**
* Constructors
*
* @param token token
* @param finish finish
* @param test case test node, can be any node in JavaScript
* @param body case body
*/
public CaseNode(final long token, final int finish, final Expression test, final Block body) {
super(token, finish);
this.test = test;
this.body = body;
this.entry = new Label("entry");
}
CaseNode(final CaseNode caseNode, final Expression test, final Block body) {
super(caseNode);
this.test = test;
this.body = body;
this.entry = new Label(caseNode.entry);
}
@Override
public boolean isTerminal() {
return body.isTerminal();
}
/**
* Assist in IR navigation.
* @param visitor IR navigating visitor.
*/
@Override
public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
if (visitor.enterCaseNode(this)) {
final Expression newTest = test == null ? null : (Expression)test.accept(visitor);
final Block newBody = body == null ? null : (Block)body.accept(visitor);
return visitor.leaveCaseNode(setTest(newTest).setBody(newBody));
}
return this;
}
@Override
public void toString(final StringBuilder sb) {
if (test != null) {
sb.append("case ");
test.toString(sb);
sb.append(':');
} else {
sb.append("default:");
}
}
/**
* Get the body for this case node
* @return the body
*/
public Block getBody() {
return body;
}
/**
* Get the entry label for this case node
* @return the entry label
*/
public Label getEntry() {
return entry;
}
/**
* Get the test expression for this case node
* @return the test
*/
public Expression getTest() {
return test;
}
/**
* Reset the test expression for this case node
* @param test new test expression
* @return new or same CaseNode
*/
public CaseNode setTest(final Expression test) {
if (this.test == test) {
return this;
}
return new CaseNode(this, test, body);
}
private CaseNode setBody(final Block body) {
if (this.body == body) {
return this;
}
return new CaseNode(this, test, body);
}
}
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