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 }