1 /*
   2  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.api.tree;
  27 
  28 import jdk.nashorn.internal.ir.ExpressionStatement;
  29 import jdk.nashorn.internal.parser.TokenType;
  30 
  31 // This implementation of VariableTree represents a destructuring declaration
  32 final class DestructuringDeclTreeImpl extends StatementTreeImpl
  33         implements VariableTree {
  34 
  35     private final TokenType declType;
  36     private final ExpressionTree lhs;
  37     private final ExpressionTree init;
  38 
  39     DestructuringDeclTreeImpl(final ExpressionStatement exprStat, final ExpressionTree lhs, final ExpressionTree init) {
  40         super(exprStat);
  41         assert exprStat.destructuringDeclarationType() != null : "expecting a destructuring decl. statement";
  42 
  43         this.declType = exprStat.destructuringDeclarationType();
  44         this.lhs = lhs;
  45         this.init = init;
  46     }
  47 
  48     @Override
  49     public Kind getKind() {
  50         return Kind.VARIABLE;
  51     }
  52 
  53     @Override
  54     public ExpressionTree getBinding() {
  55         return lhs;
  56     }
  57 
  58     @Override
  59     public ExpressionTree getInitializer() {
  60         return init;
  61     }
  62 
  63     @Override
  64     public boolean isConst() {
  65         return declType == TokenType.CONST;
  66     }
  67 
  68     @Override
  69     public boolean isLet() {
  70         return declType == TokenType.LET;
  71     }
  72 
  73     @Override
  74     public <R,D> R accept(final TreeVisitor<R,D> visitor, final D data) {
  75         return visitor.visitVariable(this, data);
  76     }
  77 }