content: /*
   *  Copyright (c) 2023-2025, Agents-Flex (fuhai999@gmail.com).
   *  <p>
   *  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
   *  <p>
   *  http://www.apache.org/licenses/LICENSE-2.0
   *  <p>
   *  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.agentsflex.core.react;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  public interface ReActStepParser {
  
      ReActStepParser DEFAULT = new ReActStepParser() {
          private final Pattern STEP_PATTERN = Pattern.compile(
              "Thought: (.*?)\n" +
                  "Action: (.*?)\n" +
                  "Action Input: (\\{[\\s\\S]*})",
              Pattern.DOTALL
          );
  
          @Override
          public List<ReActStep> parse(String content) {
              List<ReActStep> steps = new ArrayList<>();
              Matcher matcher = STEP_PATTERN.matcher(content);
  
              while (matcher.find()) {
                  String thought = matcher.group(1).trim();
                  String action = matcher.group(2).trim();
                  String actionInput = matcher.group(3).trim();
  
                  steps.add(new ReActStep(thought, action, actionInput));
              }
  
              return steps;
          }
      };
  
  
      List<ReActStep> parse(String content);
  
  
      default boolean isFinalAnswer(String content) {
          return content.contains(getFinalAnswerFlag());
      }
  
      default boolean isReActAction(String content) {
          return content.contains("Action:") && content.contains("Action Input:");
      }
  
      default String getFinalAnswerFlag() {
          return "Final Answer:";
      }
  }
  