1 /*
   2  * Copyright (c) 2010, 2013, 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);
  52         this.property = property;
  53     }
  54 
  55     private AccessNode(final AccessNode accessNode, final Expression base, final String property, final boolean isFunction, final Type type, final int id) {
  56         super(accessNode, base, isFunction, type, id);
  57         this.property = property;
  58     }
  59 
  60     /**
  61      * Assist in IR navigation.
  62      * @param visitor IR navigating visitor.
  63      */
  64     @Override
  65     public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
  66         if (visitor.enterAccessNode(this)) {
  67             return visitor.leaveAccessNode(
  68                 setBase((Expression)base.accept(visitor)));
  69         }
  70         return this;
  71     }
  72 
  73     @Override
  74     public void toString(final StringBuilder sb, final boolean printType) {
  75         final boolean needsParen = tokenType().needsParens(getBase().tokenType(), true);
  76 
  77         if (printType) {
  78             optimisticTypeToString(sb);
  79         }
  80 
  81         if (needsParen) {
  82             sb.append('(');
  83         }
  84 
  85         base.toString(sb, printType);
  86 
  87         if (needsParen) {
  88             sb.append(')');
  89         }
  90         sb.append('.');
  91 
  92         sb.append(property);
  93     }
  94 
  95     /**
  96      * Get the property name
  97      *
  98      * @return the property name
  99      */
 100     public String getProperty() {
 101         return property;
 102     }
 103 
 104     private AccessNode setBase(final Expression base) {
 105         if (this.base == base) {
 106             return this;
 107         }
 108         return new AccessNode(this, base, property, isFunction(), type, programPoint);
 109     }
 110 
 111     @Override
 112     public AccessNode setType(final Type type) {
 113         if (this.type == type) {
 114             return this;
 115         }
 116         return new AccessNode(this, base, property, isFunction(), type, programPoint);
 117     }
 118 
 119     @Override
 120     public AccessNode setProgramPoint(final int programPoint) {
 121         if (this.programPoint == programPoint) {
 122             return this;
 123         }
 124         return new AccessNode(this, base, property, isFunction(), type, programPoint);
 125     }
 126 
 127     @Override
 128     public AccessNode setIsFunction() {
 129         if (isFunction()) {
 130             return this;
 131         }
 132         return new AccessNode(this, base, property, true, type, programPoint);
 133     }
 134 }