/*
 * 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 com.hw.langchain.text.splitter;

import lombok.Builder;
import lombok.experimental.SuperBuilder;

import java.util.List;

import static com.hw.langchain.text.splitter.TextSplitterUtils.splitTextWithRegex;

/**
 * Implementation of splitting text that looks at characters.
 *
 * @author HamaWhite
 */
@SuperBuilder
public class CharacterTextSplitter extends TextSplitter {

    @Builder.Default
    protected String separator = "\n\n";

    /**
     * Split incoming text and return chunks.
     */
    @Override
    public List<String> splitText(String text) {
        // First we naively split the large input into a bunch of smaller ones.
        List<String> splits = splitTextWithRegex(text, separator, keepSeparator);
        String mergedSeparator = keepSeparator ? "" : this.separator;
        return mergeSplits(splits, mergedSeparator);
    }
}
