feat: Extract reason using regex

[shaohuzhang1]

feat: Extract reason using regex

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[shaohuzhang1]

The provided code has several issues and can be optimized:

Issues Found:

1. Inconsistent Handling of JSON Parsing:

   • In parse_classification_result, there's inconsistent handling of parsing errors using json.loads. The error case should handle exceptions more robustly.

2. Duplicate Code Block:

   • There's a duplicate block of code in execute that can be minimized by combining the two branches into a single condition.

3. Parsing Reason for Classification Results:

   • The parse_result_reason function has multiple regular expression patterns to extract reasons from different formats, which is inefficient due to repeated regex searches on each parse attempt.

4. Unused Variable matched_branch_id:

   • The variable matched_branch_id is not used within the function, so it can be removed for clarity.

5. Return Values:

   • The return values seem ambiguous. For example, when no branch matches and normal intents are available, some functions default to 'unknown' instead of returning a structured dictionary like {'id': '', 'content': ''}.

Optimization Suggestions:

1. Refactor and Simplify Logic for Classifying Result Reason:

   def parse_result_reason(self, result: str) -> str:
       """解析分类的结果原因"""
       try:
           result_json = json.loads(result)
           return result_json.get('reason', '')
       except Exception as e:
           match = re.search(
               '(?P<delim>["\s]*):(?=\s*\breason\b)(.*?)"reason"', result, re.DOTALL
           )
           if match:
               reason = match.group(1).strip()
               # Clean up possible tailing characters
               reason = re.sub(r'[,"\s]*$', '', reason)
               return reason
   
           return ''

2. Combine Condition in Execute Method:

   matched_branch = self.find_matched_branch(history_message, user_input, branch)
   
   if not matched_branch or (not matched_branch['enabled'] and matched_branch != 'other'):
       matched_branch = {key: key for key in ('id', 'content')} if other_branch else normal_intents[0]

These changes will improve the consistency, readability, and efficiency of the code while addressing potential issues such as redundant code blocks and insufficient exception handling.