feat: metagpt-Python-PDF-Feedback-UI-20260326

docs/system_design/20260326175651.json

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+{"Implementation approach":"使用pypdf库实现PDF文件的读取和文本提取，该库安装简单、API直观，完全满足'尽量简单'的要求。程序通过Python标准库argparse接收命令行参数，支持指定PDF文件路径和可选的页码范围。异常处理使用Python内置异常机制，覆盖文件不存在、格式错误、权限不足等常见情况。整个程序只需一个主文件，依赖最小化。","File list":["main.py"],"Data structures and interfaces":"\nclassDiagram\n    class PDFOpener {\n        -str file_path\n        -int start_page\n        -int end_page\n        +__init__(file_path: str, start_page: int, end_page: int)\n        +open() PdfReader\n        +get_info(reader: PdfReader) dict\n        +extract_text(reader: PdfReader) list[str]\n        +display_info(info: dict) None\n        +display_text(texts: list[str]) None\n        +run() None\n    }\n    class Main {\n        +parse_args() argparse.Namespace\n        +main() None\n    }\n    Main --> PDFOpener : creates and uses\n","Program call flow":"\nsequenceDiagram\n    participant M as Main\n    participant AP as argparse\n    participant PO as PDFOpener\n    participant PR as PdfReader(pypdf)\n\n    M->>AP: parse_args()\n    AP-->>M: args(file_path, start_page, end_page)\n    M->>PO: __init__(file_path, start_page, end_page)\n    M->>PO: run()\n    PO->>PO: open()\n    PO->>PR: PdfReader(file_path)\n    PR-->>PO: reader\n    PO->>PO: get_info(reader)\n    PR-->>PO: info(num_pages, metadata)\n    PO->>PO: display_info(info)\n    PO-->>M: print info to console\n    PO->>PO: extract_text(reader)\n    loop for each page in range\n        PR-->>PO: page.extract_text()\n    end\n    PO->>PO: display_text(texts)\n    PO-->>M: print text to console\n","Anything UNCLEAR":"当前需求已较为清晰，按最简单的文本提取功能实现。程序仅支持文本内容提取和基本信息展示，不支持复制、搜索、保存等高级操作。若后续需要支持加密PDF的解密或表格提取，可考虑升级为pdfplumber或pymupdf库。"}