org.mozilla.javascript.ast.XmlElemRef 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;
import org.mozilla.javascript.Token;
/**
* AST node for an E4X XML {@code [expr]} member-ref expression.
* The node type is {@link Token#REF_MEMBER}.
*
* Syntax:
*
*
@opt ns:: opt [ expr ]
*
* Examples include {@code ns::[expr]}, {@code @ns::[expr]}, {@code @[expr]},
* {@code *::[expr]} and {@code @*::[expr]}.
*
* Note that the form {@code [expr]} (i.e. no namespace or
* attribute-qualifier) is not a legal {@code XmlElemRef} expression,
* since it's already used for standard JavaScript {@link ElementGet}
* array-indexing. Hence, an {@code XmlElemRef} node always has
* either the attribute-qualifier, a non-{@code null} namespace node,
* or both.
*
* The node starts at the {@code @} token, if present. Otherwise it starts
* at the namespace name. The node bounds extend through the closing
* right-bracket, or if it is missing due to a syntax error, through the
* end of the index expression.
*/
public class XmlElemRef extends XmlRef {
private AstNode indexExpr;
private int lb = -1;
private int rb = -1;
{
type = Token.REF_MEMBER;
}
public XmlElemRef() {
}
public XmlElemRef(int pos) {
super(pos);
}
public XmlElemRef(int pos, int len) {
super(pos, len);
}
/**
* Returns index expression: the 'expr' in {@code @[expr]}
* or {@code @*::[expr]}.
*/
public AstNode getExpression() {
return indexExpr;
}
/**
* Sets index expression, and sets its parent to this node.
* @throws IllegalArgumentException if {@code expr} is {@code null}
*/
public void setExpression(AstNode expr) {
assertNotNull(expr);
indexExpr = expr;
expr.setParent(this);
}
/**
* Returns left bracket position, or -1 if missing.
*/
public int getLb() {
return lb;
}
/**
* Sets left bracket position, or -1 if missing.
*/
public void setLb(int lb) {
this.lb = lb;
}
/**
* Returns left bracket position, or -1 if missing.
*/
public int getRb() {
return rb;
}
/**
* Sets right bracket position, -1 if missing.
*/
public void setRb(int rb) {
this.rb = rb;
}
/**
* Sets both bracket positions.
*/
public void setBrackets(int lb, int rb) {
this.lb = lb;
this.rb = rb;
}
@Override
public String toSource(int depth) {
StringBuilder sb = new StringBuilder();
sb.append(makeIndent(depth));
if (isAttributeAccess()) {
sb.append("@");
}
if (namespace != null) {
sb.append(namespace.toSource(0));
sb.append("::");
}
sb.append("[");
sb.append(indexExpr.toSource(0));
sb.append("]");
return sb.toString();
}
/**
* Visits this node, then the namespace if provided, then the
* index expression.
*/
@Override
public void visit(NodeVisitor v) {
if (v.visit(this)) {
if (namespace != null) {
namespace.visit(v);
}
indexExpr.visit(v);
}
}
}