DestructuringDeclTreeImpl.java revision 1739:4a6a1fd3d3dd 
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
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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.
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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).
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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
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24 */
25
26package jdk.nashorn.api.tree;
27
28import jdk.nashorn.internal.ir.ExpressionStatement;
29import jdk.nashorn.internal.parser.TokenType;
30
31// This implementation of VariableTree represents a destructuring declaration
32final 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(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}
78