"""Provide service-layer logic for pdf parser.""" import fitz # PyMuPDF from typing import List, Dict, Optional, Tuple from dataclasses import dataclass, field from loguru import logger import re @dataclass class PDFPageContent: """Represent the P D F Page Content type.""" page_number: int text: str tables: List[str] = field(default_factory=list) images: List[str] = field(default_factory=list) # Keep service responsibilities explicit so downstream behavior stays predictable. blocks: List[Dict] = field(default_factory=list) @dataclass class PDFDocumentContent: """Represent the P D F Document Content type.""" file_path: str total_pages: int pages: List[PDFPageContent] metadata: Dict[str, str] = field(default_factory=dict) markdown_text: str = "" class PDFParser: """Provide the P D F Parser parser.""" def __init__(self): """Initialize the P D F Parser instance.""" self.pdf = None def parse(self, file_path: str, extract_tables: bool = True, extract_images: bool = False) -> PDFDocumentContent: """Handle parse for the P D F Parser instance.""" logger.info(f"开始解析PDF文档: {file_path}") try: self.pdf = fitz.open(file_path) doc_content = PDFDocumentContent( file_path=file_path, total_pages=self.pdf.page_count, pages=[] ) # Keep service responsibilities explicit so downstream behavior stays predictable. doc_content.metadata = self._extract_metadata() # Keep service responsibilities explicit so downstream behavior stays predictable. for page_num in range(self.pdf.page_count): page = self.pdf[page_num] page_content = self._parse_page(page, page_num + 1, extract_tables, extract_images) doc_content.pages.append(page_content) # Keep service responsibilities explicit so downstream behavior stays predictable. doc_content.markdown_text = self._generate_markdown(doc_content) self.pdf.close() logger.success(f"PDF解析完成，共{doc_content.total_pages}页") return doc_content except Exception as e: logger.error(f"PDF解析失败: {e}") raise def _extract_metadata(self) -> Dict[str, str]: """Handle extract metadata for this module for the P D F Parser instance.""" metadata = {} try: meta = self.pdf.metadata metadata = { "title": meta.get("title", ""), "author": meta.get("author", ""), "subject": meta.get("subject", ""), "keywords": meta.get("keywords", ""), "creator": meta.get("creator", ""), "producer": meta.get("producer", ""), "creation_date": meta.get("creationDate", ""), "mod_date": meta.get("modDate", ""), } except Exception as e: logger.warning(f"提取元数据失败: {e}") return metadata def _parse_page(self, page: fitz.Page, page_num: int, extract_tables: bool, extract_images: bool) -> PDFPageContent: """Handle parse page for this module for the P D F Parser instance.""" page_content = PDFPageContent(page_number=page_num, text="") # Keep service responsibilities explicit so downstream behavior stays predictable. blocks = page.get_text("dict", flags=fitz.TEXT_PRESERVE_WHITESPACE)["blocks"] page_content.blocks = blocks # Keep service responsibilities explicit so downstream behavior stays predictable. text = page.get_text("text", flags=fitz.TEXT_PRESERVE_WHITESPACE) page_content.text = text.strip() # Keep service responsibilities explicit so downstream behavior stays predictable. if extract_tables: tables = self._extract_tables_from_page(page) page_content.tables = tables # Keep service responsibilities explicit so downstream behavior stays predictable. if extract_images: images = self._extract_images_from_page(page, page_num) page_content.images = images return page_content def _extract_tables_from_page(self, page: fitz.Page) -> List[str]: """Handle extract tables from page for this module for the P D F Parser instance.""" tables = [] try: # Keep service responsibilities explicit so downstream behavior stays predictable. # Keep service responsibilities explicit so downstream behavior stays predictable. tabs = page.find_tables() if tabs: for tab in tabs: table_text = tab.extract() # Keep service responsibilities explicit so downstream behavior stays predictable. markdown_table = self._table_to_markdown(table_text) tables.append(markdown_table) except AttributeError: # Keep service responsibilities explicit so downstream behavior stays predictable. logger.warning("PyMuPDF版本不支持表格提取，请升级到2.4+版本") except Exception as e: logger.warning(f"表格提取失败: {e}") return tables def _table_to_markdown(self, table_data: List[List[str]]) -> str: """Handle table to markdown for this module for the P D F Parser instance.""" if not table_data or len(table_data) < 1: return "" lines = [] # Keep service responsibilities explicit so downstream behavior stays predictable. if len(table_data) >= 1: header = table_data[0] lines.append("| " + " | ".join(str(cell).strip() for cell in header) + " |") lines.append("| " + " | ".join("---" for _ in header) + " |") # Keep service responsibilities explicit so downstream behavior stays predictable. for row in table_data[1:]: lines.append("| " + " | ".join(str(cell).strip() for cell in row) + " |") return "\n".join(lines) def _extract_images_from_page(self, page: fitz.Page, page_num: int) -> List[str]: """Handle extract images from page for this module for the P D F Parser instance.""" images = [] # Keep service responsibilities explicit so downstream behavior stays predictable. # Keep service responsibilities explicit so downstream behavior stays predictable. try: image_list = page.get_images() for img_index, img in enumerate(image_list): xref = img[0] images.append(f"image_p{page_num}_i{img_index}_xref{xref}") except Exception as e: logger.warning(f"图片提取失败: {e}") return images def _generate_markdown(self, doc_content: PDFDocumentContent) -> str: """Handle generate markdown for this module for the P D F Parser instance.""" lines = [] # Keep service responsibilities explicit so downstream behavior stays predictable. title = doc_content.metadata.get("title", "") if title: lines.append(f"# {title}\n") else: lines.append(f"# {doc_content.file_path}\n") # Keep service responsibilities explicit so downstream behavior stays predictable. lines.append("\n## 文档信息\n") for key, value in doc_content.metadata.items(): if value and key in ["author", "subject", "keywords", "creation_date"]: lines.append(f"- **{key}**: {value}") # Keep service responsibilities explicit so downstream behavior stays predictable. lines.append("\n## 正文\n") for page in doc_content.pages: # Keep service responsibilities explicit so downstream behavior stays predictable. lines.append(f"\n---\n**第 {page.page_number} 页**\n") # Keep service responsibilities explicit so downstream behavior stays predictable. text = self._process_page_text(page.text, page.blocks) lines.append(text) # Keep service responsibilities explicit so downstream behavior stays predictable. for table in page.tables: lines.append("\n" + table + "\n") return "\n".join(lines) def _process_page_text(self, text: str, blocks: List[Dict]) -> str: """Handle process page text for this module for the P D F Parser instance.""" # Keep service responsibilities explicit so downstream behavior stays predictable. processed_text = text # Keep service responsibilities explicit so downstream behavior stays predictable. # Keep service responsibilities explicit so downstream behavior stays predictable. processed_text = self._detect_headers(text, blocks) return processed_text def _detect_headers(self, text: str, blocks: List[Dict]) -> str: """Handle detect headers for this module for the P D F Parser instance.""" lines = text.split("\n") processed_lines = [] for line in lines: line = line.strip() if not line: continue # Keep service responsibilities explicit so downstream behavior stays predictable. # Keep service responsibilities explicit so downstream behavior stays predictable. if re.match(r'^第[一二三四五六七八九十百]+章\s', line): processed_lines.append(f"\n## {line}\n") elif re.match(r'^第[一二三四五六七八九十百]+节\s', line): processed_lines.append(f"\n### {line}\n") elif re.match(r'^第[一二三四五六七八九十百]+条\s', line): processed_lines.append(f"\n#### {line}\n") elif re.match(r'^[一二三四五六七八九十]+\s*[、.]', line): # Keep service responsibilities explicit so downstream behavior stays predictable. processed_lines.append(f"- {line}") else: processed_lines.append(line) return "\n".join(processed_lines) def parse_to_markdown(self, file_path: str) -> str: """Parse to markdown for the P D F Parser instance.""" doc_content = self.parse(file_path) return doc_content.markdown_text def parse_pdf(file_path: str, **kwargs) -> PDFDocumentContent: """Parse pdf.""" parser = PDFParser() return parser.parse(file_path, **kwargs) def parse_pdf_to_markdown(file_path: str) -> str: """Parse pdf to markdown.""" parser = PDFParser() return parser.parse_to_markdown(file_path)