/*
 * Copyright (c) 2023 looly(loolly@aliyun.com)
 * Hutool is licensed under Mulan PSL v2.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          https://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */

package org.dromara.hutool.core.text.finder;

import org.dromara.hutool.core.lang.Assert;

import java.util.function.Predicate;

/**
 * 字符匹配查找器<br>
 * 查找满足指定{@link Predicate} 匹配的字符所在位置，此类长用于查找某一类字符，如数字等
 *
 * @since 5.7.14
 * @author looly
 */
public class CharMatcherFinder extends TextFinder {
	private static final long serialVersionUID = 1L;

	private final Predicate<Character> matcher;

	/**
	 * 构造
	 * @param matcher 被查找的字符匹配器
	 */
	public CharMatcherFinder(final Predicate<Character> matcher) {
		this.matcher = matcher;
	}

	@Override
	public int start(final int from) {
		Assert.notNull(this.text, "Text to find must be not null!");
		final int limit = getValidEndIndex();
		if(negative){
			for (int i = from; i > limit; i--) {
				if(null == matcher || matcher.test(text.charAt(i))){
					return i;
				}
			}
		} else {
			for (int i = from; i < limit; i++) {
				if(null == matcher || matcher.test(text.charAt(i))){
					return i;
				}
			}
		}
		return -1;
	}

	@Override
	public int end(final int start) {
		if(start < 0){
			return -1;
		}
		return start + 1;
	}
}
