AccessNode.java revision 1668:bafd733be429 
1/*
2 * Copyright (c) 2010, 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
26package jdk.nashorn.internal.ir;
27
28import jdk.nashorn.internal.codegen.types.Type;
29import jdk.nashorn.internal.ir.annotations.Immutable;
30import jdk.nashorn.internal.ir.visitor.NodeVisitor;
31
32/**
33 * IR representation of a property access (period operator.)
34 */
35@Immutable
36public final class AccessNode extends BaseNode {
37    private static final long serialVersionUID = 1L;
38
39    /** Property name. */
40    private final String property;
41
42    /**
43     * Constructor
44     *
45     * @param token     token
46     * @param finish    finish
47     * @param base      base node
48     * @param property  property
49     */
50    public AccessNode(final long token, final int finish, final Expression base, final String property) {
51        super(token, finish, base, false, false);
52        this.property = property;
53    }
54
55    private AccessNode(final AccessNode accessNode, final Expression base, final String property, final boolean isFunction,
56                       final Type type, final int id, final boolean isSuper) {
57        super(accessNode, base, isFunction, type, id, isSuper);
58        this.property = property;
59    }
60
61    /**
62     * Assist in IR navigation.
63     * @param visitor IR navigating visitor.
64     */
65    @Override
66    public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
67        if (visitor.enterAccessNode(this)) {
68            return visitor.leaveAccessNode(
69                setBase((Expression)base.accept(visitor)));
70        }
71        return this;
72    }
73
74    @Override
75    public void toString(final StringBuilder sb, final boolean printType) {
76        final boolean needsParen = tokenType().needsParens(getBase().tokenType(), true);
77
78        if (printType) {
79            optimisticTypeToString(sb);
80        }
81
82        if (needsParen) {
83            sb.append('(');
84        }
85
86        base.toString(sb, printType);
87
88        if (needsParen) {
89            sb.append(')');
90        }
91        sb.append('.');
92
93        sb.append(property);
94    }
95
96    /**
97     * Get the property name
98     *
99     * @return the property name
100     */
101    public String getProperty() {
102        return property;
103    }
104
105    private AccessNode setBase(final Expression base) {
106        if (this.base == base) {
107            return this;
108        }
109        return new AccessNode(this, base, property, isFunction(), type, programPoint, isSuper());
110    }
111
112    @Override
113    public AccessNode setType(final Type type) {
114        if (this.type == type) {
115            return this;
116        }
117        return new AccessNode(this, base, property, isFunction(), type, programPoint, isSuper());
118    }
119
120    @Override
121    public AccessNode setProgramPoint(final int programPoint) {
122        if (this.programPoint == programPoint) {
123            return this;
124        }
125        return new AccessNode(this, base, property, isFunction(), type, programPoint, isSuper());
126    }
127
128    @Override
129    public AccessNode setIsFunction() {
130        if (isFunction()) {
131            return this;
132        }
133        return new AccessNode(this, base, property, true, type, programPoint, isSuper());
134    }
135
136    @Override
137    public AccessNode setIsSuper() {
138        if (isSuper()) {
139            return this;
140        }
141        return new AccessNode(this, base, property, isFunction(), type, programPoint, true);
142    }
143}
144