org.mozilla.javascript.ast.XmlRef Maven / Gradle / Ivy
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript.ast;
/**
* Base class for E4X XML attribute-access or property-get expressions.
* Such expressions can take a variety of forms. The general syntax has
* three parts:
*
*
* - optional: an {@code @}
(specifying an attribute access)
* - optional: a namespace (a {@code Name}) and double-colon
* - required: either a {@code Name} or a bracketed [expression]
*
*
* The property-name expressions (examples: {@code ns::name}, {@code @name})
* are represented as {@link XmlPropRef} nodes. The bracketed-expression
* versions (examples: {@code ns::[name]}, {@code @[name]}) become
* {@link XmlElemRef} nodes.
*
* This node type (or more specifically, its subclasses) will
* sometimes be the right-hand child of a {@link PropertyGet} node or
* an {@link XmlMemberGet} node. The {@code XmlRef} node may also
* be a standalone primary expression with no explicit target, which
* is valid in certain expression contexts such as
* {@code company..employee.(@id < 100)} - in this case, the {@code @id}
* is an {@code XmlRef} that is part of an infix '<' expression
* whose parent is an {@code XmlDotQuery} node.
*/
public abstract class XmlRef extends AstNode {
protected Name namespace;
protected int atPos = -1;
protected int colonPos = -1;
public XmlRef() {
}
public XmlRef(int pos) {
super(pos);
}
public XmlRef(int pos, int len) {
super(pos, len);
}
/**
* Return the namespace. May be {@code @null}.
*/
public Name getNamespace() {
return namespace;
}
/**
* Sets namespace, and sets its parent to this node.
* Can be {@code null}.
*/
public void setNamespace(Name namespace) {
this.namespace = namespace;
if (namespace != null)
namespace.setParent(this);
}
/**
* Returns {@code true} if this expression began with an {@code @}-token.
*/
public boolean isAttributeAccess() {
return atPos >= 0;
}
/**
* Returns position of {@code @}-token, or -1 if this is not
* an attribute-access expression.
*/
public int getAtPos() {
return atPos;
}
/**
* Sets position of {@code @}-token, or -1
*/
public void setAtPos(int atPos) {
this.atPos = atPos;
}
/**
* Returns position of {@code ::} token, or -1 if not present.
* It will only be present if the namespace node is non-{@code null}.
*/
public int getColonPos() {
return colonPos;
}
/**
* Sets position of {@code ::} token, or -1 if not present
*/
public void setColonPos(int colonPos) {
this.colonPos = colonPos;
}
}