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