220 lines
8.1 KiB
Python
220 lines
8.1 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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# from flask_app.general.format_change import docx2pdf # 确保此模块可用
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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，合并多个正则表达式为一个
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text = re.sub(
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r'(^\s*\d+\s*(?=\D))|(\s+\d+\s*$)|(\s*/\s*\d+\s*)|(\s*[—-]\s*\d+\s*[—-]\s*)',
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'',
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text,
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flags=re.MULTILINE
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)
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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(set(line.strip() for line in first_lines if line.strip()))
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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 = set.intersection(*headers)
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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。
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"""
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try:
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base_file_name = os.path.splitext(os.path.basename(pdf_path))[0]
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output_pdf_path = os.path.join(output_folder, f"{base_file_name}_{output_suffix}.pdf")
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if start_page is None or end_page is None 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 find_page_indices(pdf_document, begin_pattern, end_pattern, begin_page, common_header):
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"""
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查找起始页和结束页的索引。
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"""
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start_page = None
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end_page = None
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total_pages = len(pdf_document.pages)
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for i, page in enumerate(pdf_document.pages):
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if i <= begin_page:
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continue
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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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if start_page is None and re.search(begin_pattern, cleaned_text):
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start_page = i
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continue
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if start_page is not None and re.search(end_pattern, cleaned_text):
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end_page = i
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break
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return start_page, end_page if end_page else total_pages - 1
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def extract_pages(pdf_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix):
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"""
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根据开始和结束模式提取PDF页面。
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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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start_page, end_page = find_page_indices(pdf_document, begin_pattern, end_pattern, begin_page, common_header)
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if output_suffix == "format" and start_page is None:
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print(f"{output_suffix}: 未找到起始页，尝试二次提取！ 文件: {pdf_path}")
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# 二次提取逻辑，保留原有功能
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start_page, end_page = find_page_indices(
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pdf_document,
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re.compile(r'^(?:响应|投标).*?格式.*', re.MULTILINE),
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end_pattern,
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begin_page,
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common_header
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)
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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}")
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return ""
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if start_page is None:
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print(f"未找到起始页，提取失败！ 文件: {pdf_path}")
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return ""
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if end_page is None:
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end_page = len(pdf_document.pages) - 1
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print(f"{output_suffix}: 未找到结束页，默认截取到文件末尾。 文件: {pdf_path}")
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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, end_pattern, 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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return extract_pages(pdf_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix) or ""
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def process_input(input_path, output_folder, begin_pattern, begin_page, end_pattern, 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, end_pattern, output_suffix)
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generated_files.append(result)
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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, end_pattern, output_suffix)
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generated_files.append(result)
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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/Word文件。")
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return [f for f in generated_files if f] # 过滤空字符串
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def truncate_pdf_main(input_path, output_folder, selection):
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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_page = 10
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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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re.MULTILINE
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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]+',
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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 []
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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, end_pattern, local_output_suffix)
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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 []
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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\\包头市公安支队机动车查验监管系统招标文201907.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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