org.mozilla.javascript.ast.Label Maven / Gradle / Ivy
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/* -*- 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 representing a label. It is a distinct node type so it can
* record its length and position for code-processing tools.
* Node type is {@link Token#LABEL}.
*/
public class Label extends Jump {
private String name;
{
type = Token.LABEL;
}
public Label() {
}
public Label(int pos) {
this(pos, -1);
}
public Label(int pos, int len) {
// can't call super (Jump) for historical reasons
position = pos;
length = len;
}
public Label(int pos, int len, String name) {
this(pos, len);
setName(name);
}
/**
* Returns the label text
*/
public String getName() {
return name;
}
/**
* Sets the label text
* @throws IllegalArgumentException if name is {@code null} or the
* empty string.
*/
public void setName(String name) {
name = name == null ? null : name.trim();
if (name == null || "".equals(name))
throw new IllegalArgumentException("invalid label name");
this.name = name;
}
@Override
public String toSource(int depth) {
StringBuilder sb = new StringBuilder();
sb.append(makeIndent(depth));
sb.append(name);
sb.append(":\n");
return sb.toString();
}
/**
* Visits this label. There are no children to visit.
*/
@Override
public void visit(NodeVisitor v) {
v.visit(this);
}
}