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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Steve Yegge
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript.ast;
import org.mozilla.javascript.Token;
/**
* AST node for an indexed property reference, such as {@code foo['bar']} or
* {@code foo[2]}. This is sometimes called an "element-get" operation, hence
* the name of the node.
*
* Node type is {@link Token#GETELEM}.
*
* The node bounds extend from the beginning position of the target through the
* closing right-bracket. In the presence of a syntax error, the right bracket
* position is -1, and the node ends at the end of the element expression.
*/
public class ElementGet extends AstNode {
private AstNode target;
private AstNode element;
private int lb = -1;
private int rb = -1;
{
type = Token.GETELEM;
}
public ElementGet() {
}
public ElementGet(int pos) {
super(pos);
}
public ElementGet(int pos, int len) {
super(pos, len);
}
public ElementGet(AstNode target, AstNode element) {
setTarget(target);
setElement(element);
}
/**
* Returns the object on which the element is being fetched.
*/
public AstNode getTarget() {
return target;
}
/**
* Sets target object, and sets its parent to this node.
* @param target expression evaluating to the object upon which
* to do the element lookup
* @throws IllegalArgumentException if target is {@code null}
*/
public void setTarget(AstNode target) {
assertNotNull(target);
this.target = target;
target.setParent(this);
}
/**
* Returns the element being accessed
*/
public AstNode getElement() {
return element;
}
/**
* Sets the element being accessed, and sets its parent to this node.
* @throws IllegalArgumentException if element is {@code null}
*/
public void setElement(AstNode element) {
assertNotNull(element);
this.element = element;
element.setParent(this);
}
/**
* Returns left bracket position
*/
public int getLb() {
return lb;
}
/**
* Sets left bracket position
*/
public void setLb(int lb) {
this.lb = lb;
}
/**
* Returns right bracket position, -1 if missing
*/
public int getRb() {
return rb;
}
/**
* Sets right bracket position, -1 if not present
*/
public void setRb(int rb) {
this.rb = rb;
}
public void setParens(int lb, int rb) {
this.lb = lb;
this.rb = rb;
}
@Override
public String toSource(int depth) {
StringBuilder sb = new StringBuilder();
sb.append(makeIndent(depth));
sb.append(target.toSource(0));
sb.append("[");
sb.append(element.toSource(0));
sb.append("]");
return sb.toString();
}
/**
* Visits this node, the target, and the index expression.
*/
@Override
public void visit(NodeVisitor v) {
if (v.visit(this)) {
target.visit(v);
element.visit(v);
}
}
}