reuse parser in the generatedexpr.ParseExpression

## Enhancement

<img width="1920" alt="Image" src="https://github.com/user-attachments/assets/aece0676-62b9-4147-92d0-5b58ae25cd95" />


<img width="1920" alt="Image" src="https://github.com/user-attachments/assets/bcc91273-7a9e-41ff-94b0-ac517cc32c45" />