content: /**
   * Copyright (C) 2024 AIDC-AI
   *
   * 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
   *
   *     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.alibaba.langengine.core.agent.conversational;
  
  import com.alibaba.langengine.core.agent.AgentAction;
  import com.alibaba.langengine.core.agent.AgentFinish;
  import com.alibaba.langengine.core.agent.AgentOutputParser;
  import lombok.Data;
  
  import java.util.Collections;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * Output parser for the conversational agent.
   *
   * @author xiaoxuan.lp
   */
  @Data
  public class ConvoOutputParser extends AgentOutputParser {
  
      /**
       * Prefix to use before AI output.
       */
      private String aiPrefix = "AI";
  
      @Override
      public Object parse(String text) {
          if (text.contains(aiPrefix + ":")) {
              String[] parts = text.split(aiPrefix + ":");
              String output = parts[parts.length - 1].trim();
              return new AgentFinish(Collections.singletonMap("output", output), text);
          }
          Pattern pattern = Pattern.compile("Action: (.*?)[\\n]*Action Input: (.*)");
          Matcher matcher = pattern.matcher(text);
          if (!matcher.find()) {
              throw new RuntimeException("Could not parse LLM output: `" + text + "`");
          }
          String action = matcher.group(1);
          String actionInput = matcher.group(2);
  
          AgentAction agentAction = new AgentAction();
          agentAction.setTool(action.trim());
          agentAction.setToolInput(actionInput.trim());
          agentAction.setLog(text);
          return agentAction;
      }
  
      @Override
      public String getFormatInstructions() {
          return PromptConstants.FORMAT_INSTRUCTIONS;
      }
  
      @Override
      public String getParserType() {
          return "conversational";
      }
  }
  