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.mrkl;
  
  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.HashMap;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import static com.alibaba.langengine.core.agent.mrkl.PromptConstants.FORMAT_INSTRUCTIONS;
  
  /**
   * MRKL OutputParser
   *
   * @author xiaoxuan.lp
   */
  @Data
  public class MRKLOutputParser extends AgentOutputParser {
  
      private static final String FINAL_ANSWER_ACTION = "Final Answer:";
  
      public String getFormatInstructions() {
          return FORMAT_INSTRUCTIONS;
      }
  
      @Override
      public String getParserType() {
          return "mrkl";
      }
  
      @Override
      public Object parse(String text) {
          if(text.indexOf(FINAL_ANSWER_ACTION) >= 0) {
              Map<String, Object> returnValues = new HashMap<>();
              returnValues.put("output", text.substring(text.indexOf(FINAL_ANSWER_ACTION) + FINAL_ANSWER_ACTION.length()));
              AgentFinish agentFinish = new AgentFinish();
              agentFinish.setReturnValues(returnValues);
              agentFinish.setLog(text);
              return agentFinish;
          }
          String regex = "Action\\s*\\d*\\s*:[\\s]*(.*?)[\\s]*Action\\s*\\d*\\s*Input\\s*\\d*\\s*:[\\s]*(.*)";
          Pattern pattern = Pattern.compile(regex, Pattern.DOTALL);
          Matcher matcher = pattern.matcher(text);
          if(matcher.find()) {
              String action = matcher.group(1);
              String actionInput = matcher.group(2);
              AgentAction agentAction = new AgentAction();
              agentAction.setTool(action);
              agentAction.setToolInput(actionInput);
              agentAction.setLog(text);
              return agentAction;
          }
          throw new RuntimeException(String.format("Could not parse LLM output: %s", text));
      }
  }
  