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 }