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/*
 * Copyright (c) 2020-2030, Shuigedeng ([email protected] & https://blog.taotaocloud.top/).
 *
 * Licensed 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 com.taotao.boot.pinyin.support.style;

import com.taotao.boot.pinyin.model.CharToneInfo;

/**
 * 不带声调的注音形式
 *
 * （1）直接使用便利替换，避免 regex 的开销。 （2）原理上来复杂度都是 O(n)
 *
 * 一个拼音只会有一个声调，如果有直接返回即可。
 */
public class NormalPinyinToneStyle extends AbstractPinyinToneStyle {

    @Override
    protected String getCharFormat(String tone, CharToneInfo toneInfo) {
        int index = toneInfo.getIndex();

        // 没有音调，直接返回
        if (index < 0) {
            return tone;
        }

        char letter = toneInfo.getToneItem().getLetter();
        return super.connector(tone, index, String.valueOf(letter));
    }
}