302 lines
12 KiB
Python
302 lines
12 KiB
Python
from PyPDF2 import PdfReader, PdfWriter
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import re # 导入正则表达式库
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import os # 用于文件和文件夹操作
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def clean_page_content(text, common_header):
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"""
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清理页面内容，通过删除公共抬头和页码。
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"""
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if common_header:
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for header_line in common_header.split('\n'):
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if header_line.strip():
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# 替换首次出现的完整行
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text = re.sub(r'^' + re.escape(header_line.strip()) + r'\n?', '', text, count=1)
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# 删除页码，支持多种格式
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text = re.sub(r'^\s*\d+\s*(?=\D)', '', text) # 删除开头的页码，仅当紧跟非数字字符时
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text = re.sub(r'\s+\d+\s*$', '', text) # 删除结尾的页码
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text = re.sub(r'\s*\/\s*\d+\s*', '', text) # 删除形如 /129 的页码
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text = re.sub(r'\s*[—-]\s*\d+\s*[—-]\s*', '', text) # 删除形如 '—2—' 或 '-2-' 的页码
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return text
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def extract_common_header(pdf_path):
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"""
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从PDF的前几页提取公共抬头。
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"""
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pdf_document = PdfReader(pdf_path)
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headers = []
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total_pages = len(pdf_document.pages)
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# 确定要读取的页数和起始页
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pages_to_read = 2 if total_pages == 2 else 3
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start_page = 0 if total_pages == 2 else max(0, (total_pages // 2) - 1)
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for i in range(start_page, min(start_page + pages_to_read, total_pages)):
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page = pdf_document.pages[i]
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text = page.extract_text() or ""
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if text:
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# 只取每页的前三行
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first_lines = text.strip().split('\n')[:3]
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headers.append(first_lines)
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if len(headers) < 2:
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return "" # 如果没有足够的页来比较，返回空字符串
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# 寻找每一行中的公共部分，按顺序保留
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common_headers = []
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for lines in zip(*headers):
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first_words = lines[0].split()
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common_line = [word for word in first_words if all(word in line.split() for line in lines[1:])]
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if common_line:
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common_headers.append(' '.join(common_line))
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return '\n'.join(common_headers)
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def is_pdf_or_doc(filename):
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"""
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判断文件是否为PDF或Word文档。
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"""
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return filename.lower().endswith(('.pdf', '.doc', '.docx'))
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# def convert_to_pdf(file_path):
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# """
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# 如果是Word文档，则转换为PDF。
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# """
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# if file_path.lower().endswith(('.doc', '.docx')):
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# return docx2pdf(file_path)
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# return file_path
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def save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix):
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"""
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将提取的页面保存为新的PDF文件，统一命名为 "bid_format.pdf" 并存放在独立的子文件夹中。
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"""
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try:
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output_pdf_path = os.path.join(output_folder, "bid_format.pdf")
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# 检查 start_page 和 end_page 是否为 None
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if start_page is None or end_page is None:
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print(f"起始页或结束页为 None: start_page={start_page}, end_page={end_page} 文件: {pdf_path}")
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return ""
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if start_page < 0 or end_page >= len(pdf_document.pages) or start_page > end_page:
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print(f"无效的页面范围: {start_page} 到 {end_page} 文件: {pdf_path}")
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return ""
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output_doc = PdfWriter()
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for page_num in range(start_page, end_page + 1):
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output_doc.add_page(pdf_document.pages[page_num])
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with open(output_pdf_path, 'wb') as f:
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output_doc.write(f)
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print(f"{output_suffix} 已截取并保存页面从 {start_page} 到 {end_page} 为 {output_pdf_path}")
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return output_pdf_path
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except Exception as e:
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print(f"Error in save_extracted_pages for file {pdf_path}: {e}")
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return "" # 返回空字符串
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def extract_pages_generic(pdf_document, begin_pattern, begin_page, common_header, total_pages):
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"""
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通用函数，根据开始模式提取起始页，并将结束页设为文件末尾。
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参数:
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- pdf_document: PdfReader 对象。
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- begin_pattern: 用于匹配起始页的正则模式。
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- begin_page: 起始页的页面索引下限。
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- common_header: 公共页头，用于清理页面内容。
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- total_pages: PDF文档的总页数（索引从0开始）。
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返回:
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- start_page: 匹配到的起始页的页面索引。
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- end_page: 结束页的页面索引（设为文件末尾）。
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"""
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start_page = None
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end_page = total_pages # 结束页设为文件末尾
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for i in range(total_pages, -1, -1):
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page = pdf_document.pages[i]
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text = page.extract_text() or ""
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cleaned_text = clean_page_content(text, common_header)
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# print(cleaned_text) # 可根据需要取消注释以调试
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if re.search(begin_pattern, cleaned_text) and i > begin_page:
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start_page = i
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print(f"找到起始页: 页码 {i + 1}") # 页码通常从1开始
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break # 找到起始页后退出循环
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return start_page, end_page
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def extract_pages_twice(pdf_path, output_folder, output_suffix, common_header):
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"""
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二次提取PDF页面，仅根据开始模式从后往前提取。
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参数:
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- pdf_path: PDF文件的路径。
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- output_folder: 提取后页面的输出文件夹。
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- output_suffix: 输出文件的后缀名。
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- common_header: 公共页头，用于清理页面内容。
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返回:
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- 提取的页面保存结果，或空字符串表示失败。
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"""
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try:
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pdf_document = PdfReader(pdf_path)
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total_pages = len(pdf_document.pages) - 1 # 获取总页数（索引从0开始）
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begin_page = 10 # 起始页的页面索引下限
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start_page = None
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end_page = total_pages # 结束页设为文件末尾
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# 定义开始模式列表
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begin_patterns = [
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re.compile(r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(?:响应|投标).*?格式.*', re.MULTILINE),
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re.compile(r"\s*(投标文件格式|响应文件格式|响应性文件格式)\s*")
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]
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# 定义排除模式
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exclusion_pattern = re.compile(r'文件的构成|文件的组成|目录|评标办法|技术标准|其他材料|合同')
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# 遍历每个开始模式
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for begin_pattern in begin_patterns:
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# 从后往前遍历页面
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for i in range(total_pages, -1, -1):
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page = pdf_document.pages[i]
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text = page.extract_text() or ""
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cleaned_text = clean_page_content(text, common_header)
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# 如果页面内容匹配排除模式，则跳过
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if exclusion_pattern and re.search(exclusion_pattern, cleaned_text):
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continue
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# 检查是否匹配开始模式，并且页面索引大于 begin_page
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if re.search(begin_pattern, cleaned_text) and i > begin_page:
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start_page = i
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print(f"二次提取找到起始页: 页码 {i + 1}") # 页码通常从1开始
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break # 找到起始页后退出循环
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if start_page is not None:
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break # 如果找到起始页，退出外层循环
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if start_page is None:
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print(f"{output_suffix}: 未找到起始页，二次提取失败！ 文件: {pdf_path}")
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return ""
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# end_page 已经设为文件末尾
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return save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix)
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except Exception as e:
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print(f"Error processing {pdf_path} in extract_pages_twice: {e}")
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return ""
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def extract_pages(pdf_path, output_folder, begin_pattern, begin_page, output_suffix):
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"""
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根据开始模式从后往前提取PDF页面。
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参数:
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- pdf_path: PDF文件的路径。
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- output_folder: 提取后页面的输出文件夹。
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- begin_pattern: 用于匹配起始页的正则模式。
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- begin_page: 起始页的页面索引下限。
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- output_suffix: 输出文件的后缀名。
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"""
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try:
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common_header = extract_common_header(pdf_path)
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pdf_document = PdfReader(pdf_path)
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total_pages = len(pdf_document.pages) - 1 # 获取总页数（索引从0开始）
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# 提取起始页，结束页直接设为文件末尾
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start_page, end_page = extract_pages_generic(pdf_document, begin_pattern, begin_page, common_header,
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total_pages)
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if output_suffix == "format":
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if start_page is None:
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print(f"{output_suffix}: 未找到起始页，提取失败！ 文件: {pdf_path} 尝试二次提取！")
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return extract_pages_twice(pdf_path, output_folder, output_suffix, common_header)
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# end_page 已经设为文件末尾
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return save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix)
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# 如果 output_suffix 不是 "format"，同样保存提取的页面
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return save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix)
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except Exception as e:
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print(f"Error processing {pdf_path}: {e}")
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return ""
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def process_files(file_path, output_folder, begin_pattern, begin_page, output_suffix):
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"""
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处理单个文件：转换为PDF（如果需要）并提取页面。
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"""
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# pdf_path = convert_to_pdf(file_path)
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pdf_path=file_path
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result = extract_pages(pdf_path, output_folder, begin_pattern, begin_page, output_suffix)
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return result or ""
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def process_input(input_path, output_folder, begin_pattern, begin_page,output_suffix):
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"""
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处理输入路径，可以是文件或目录。
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"""
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if not os.path.exists(output_folder):
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os.makedirs(output_folder)
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generated_files = []
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if os.path.isdir(input_path):
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for file_name in os.listdir(input_path):
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file_path = os.path.join(input_path, file_name)
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if is_pdf_or_doc(file_path):
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result = process_files(file_path, output_folder, begin_pattern, begin_page, output_suffix)
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if isinstance(result, tuple):
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generated_files.extend([f if f else "" for f in result]) # 保留空字符串
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else:
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generated_files.append(result) # 直接添加result，可能是空字符串
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elif os.path.isfile(input_path) and is_pdf_or_doc(input_path):
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result = process_files(input_path, output_folder, begin_pattern, begin_page, output_suffix)
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if isinstance(result, tuple):
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generated_files.extend([f if f else "" for f in result]) # 保留空字符串
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else:
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generated_files.append(result) # 直接添加result，可能是空字符串
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else:
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print("提供的路径既不是文件夹也不是PDF文件。")
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return generated_files
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def truncate_pdf_main(input_path, output_folder, selection,begin_page=10):
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"""
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主函数，根据选择截取PDF内容。
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"""
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try:
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if selection == 1: # 投标文件格式
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begin_pattern = re.compile(
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r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(?:响应|投标).*?格式.*'
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)
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# end_pattern = re.compile(
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# r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE
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# )
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local_output_suffix = "format"
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else:
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print("无效的选择:请选择1")
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return None
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# 调用相应的处理函数
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return process_input(input_path, output_folder, begin_pattern, begin_page, local_output_suffix) or ""
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except Exception as e:
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print(f"Error in truncate_pdf_main: {e}")
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return "" # 返回空字符串
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if __name__ == "__main__":
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# 定义输入和输出路径
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# input_path = "C:\\Users\\Administrator\\Desktop\\货物标\\zbfiles"
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input_path="C:\\Users\\Administrator\\Desktop\\招标文件\\招标test文件夹\\zbtest2.pdf"
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output_folder = "C:\\Users\\Administrator\\Desktop\\货物标\\zbfiles\\新建文件夹"
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selection = 1 # 1 - 投标文件格式
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# 执行截取
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generated_files = truncate_pdf_main(input_path, output_folder, selection)
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print("生成的文件:", generated_files)
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