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/*
* 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);
this.index = index;
}
private IndexNode(final IndexNode indexNode, final Expression base, final Expression index, final boolean isFunction, final Type type, final int programPoint) {
super(indexNode, base, isFunction, type, programPoint);
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);
}
/**
* 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);
}
@Override
public IndexNode setType(final Type type) {
if (this.type == type) {
return this;
}
return new IndexNode(this, base, index, isFunction(), type, programPoint);
}
@Override
public IndexNode setIsFunction() {
if (isFunction()) {
return this;
}
return new IndexNode(this, base, index, true, type, programPoint);
}
@Override
public IndexNode setProgramPoint(final int programPoint) {
if (this.programPoint == programPoint) {
return this;
}
return new IndexNode(this, base, index, isFunction(), type, programPoint);
}
}
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