Apache Ant Source Code Files are inside the Apache Ant source package file like apache-ant-1.10.10-src.zip. Unzip the source package file and go to the "src/main" sub-directory, you will see source code files.

Here is the list of Java source code files of the Apache Ant 1.10.10 in \Users\fyicenter\apache-ant-1.10.10\src\main:

⏎ org/apache/tools/ant/property/ParseNextProperty.java

/*
 *  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
 *
 *      https://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.Project;

/**
 * Helper for {@link PropertyExpander PropertyExpander} that can be
 * used to expand property references to values.
 * @since Ant 1.8.0
 */
public interface ParseNextProperty {
    /**
     * Get the current project.
     * @return the current ant project.
     */
    Project getProject();

    /**
     * Return any property that can be parsed from the specified position
     * in the specified String.
     * @param value String to parse
     * @param pos ParsePosition
     * @return Object or null if no property is at the current location.
     */
    Object parseNextProperty(String value, ParsePosition pos);
}

⏎ org/apache/tools/ant/property/ParseNextProperty.java

Or download all of them as a single archive file:

File name: apache-ant-1.10.10-fyi.zip
File size: 2392938 bytes
Release date: 2021-04-17
Download 

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