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agents-flex-core/src/main/java/com/agentsflex/core/react/ReActStepParser.java

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+/*
+ *  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: (\\{.*?})",
+            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:";
+    }
+}