| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.ir; |
| |
| import jdk.nashorn.internal.codegen.types.Type; |
| import jdk.nashorn.internal.ir.annotations.Immutable; |
| import jdk.nashorn.internal.ir.visitor.NodeVisitor; |
| /** |
| * IR representation of an indexed access (brackets operator.) |
| */ |
| @Immutable |
| public final class IndexNode extends BaseNode { |
| private static final long serialVersionUID = 1L; |
| |
| /** Property index. */ |
| private final Expression index; |
| |
| /** |
| * Constructors |
| * |
| * @param token token |
| * @param finish finish |
| * @param base base node for access |
| * @param index index for access |
| */ |
| public IndexNode(final long token, final int finish, final Expression base, final Expression index) { |
| super(token, finish, base, false, false); |
| this.index = index; |
| } |
| |
| private IndexNode(final IndexNode indexNode, final Expression base, final Expression index, final boolean isFunction, |
| final Type type, final int programPoint, final boolean isSuper) { |
| super(indexNode, base, isFunction, type, programPoint, isSuper); |
| this.index = index; |
| } |
| |
| @Override |
| public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { |
| if (visitor.enterIndexNode(this)) { |
| return visitor.leaveIndexNode( |
| setBase((Expression)base.accept(visitor)). |
| setIndex((Expression)index.accept(visitor))); |
| } |
| return this; |
| } |
| |
| @Override |
| public void toString(final StringBuilder sb, final boolean printType) { |
| final boolean needsParen = tokenType().needsParens(base.tokenType(), true); |
| |
| if (needsParen) { |
| sb.append('('); |
| } |
| |
| if (printType) { |
| optimisticTypeToString(sb); |
| } |
| |
| base.toString(sb, printType); |
| |
| if (needsParen) { |
| sb.append(')'); |
| } |
| |
| sb.append('['); |
| index.toString(sb, printType); |
| sb.append(']'); |
| } |
| |
| /** |
| * Get the index expression for this IndexNode |
| * @return the index |
| */ |
| public Expression getIndex() { |
| return index; |
| } |
| |
| private IndexNode setBase(final Expression base) { |
| if (this.base == base) { |
| return this; |
| } |
| return new IndexNode(this, base, index, isFunction(), type, programPoint, isSuper()); |
| } |
| |
| /** |
| * Set the index expression for this node |
| * @param index new index expression |
| * @return a node equivalent to this one except for the requested change. |
| */ |
| public IndexNode setIndex(final Expression index) { |
| if(this.index == index) { |
| return this; |
| } |
| return new IndexNode(this, base, index, isFunction(), type, programPoint, isSuper()); |
| } |
| |
| @Override |
| public IndexNode setType(final Type type) { |
| if (this.type == type) { |
| return this; |
| } |
| return new IndexNode(this, base, index, isFunction(), type, programPoint, isSuper()); |
| } |
| |
| @Override |
| public IndexNode setIsFunction() { |
| if (isFunction()) { |
| return this; |
| } |
| return new IndexNode(this, base, index, true, type, programPoint, isSuper()); |
| } |
| |
| @Override |
| public IndexNode setProgramPoint(final int programPoint) { |
| if (this.programPoint == programPoint) { |
| return this; |
| } |
| return new IndexNode(this, base, index, isFunction(), type, programPoint, isSuper()); |
| } |
| |
| @Override |
| public IndexNode setIsSuper() { |
| if (isSuper()) { |
| return this; |
| } |
| return new IndexNode(this, base, index, isFunction(), type, programPoint, true); |
| } |
| } |