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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.property;
import java.text.ParsePosition;
import org.apache.tools.ant.PropertyHelper;
/**
* Responsible for locating a property reference inside a String.
* @since Ant 1.8.0
*/
public interface PropertyExpander extends PropertyHelper.Delegate {
/**
* Determine whether there is a property reference at the current
* ParsePosition and return its name (or null if there is none).
*
* <p>Implementations should advance the ParsePosition to the last
* character that makes up the property reference. E.g. the
* default implementation would return <code>"foo"</code> for
* <code>${foo}</code> and advance the ParsePosition to the
* <code>}</code> character.</p>
*
* @param s the String to parse.
* @param pos the ParsePosition in use, the location is expected
* to be modified if a property reference has been found (and may
* even be modified if no reference has been found).
* @param parseNextProperty provides access to the Project and may
* be used to look up property values.
* @return property name if any, else <code>null</code>.
*/
String parsePropertyName(String s, ParsePosition pos,
ParseNextProperty parseNextProperty);
}
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