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 
  26 package jdk.nashorn.internal.ir;
  27 
  28 import jdk.nashorn.internal.codegen.types.Type;
  29 import jdk.nashorn.internal.ir.annotations.Immutable;
  30 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
  31 
  32 /**
  33  * IR representation of a property access (period operator.)
  34  */
  35 @Immutable
  36 public 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 }