zbparse/flask_app/货物标/货物标截取pdf.py

from PyPDF2 import PdfReader, PdfWriter
import re  # 导入正则表达式库
import os  # 用于文件和文件夹操作
from flask_app.main.format_change import docx2pdf



def clean_page_content(text, common_header):
    # 首先删除抬头公共部分
    if common_header:  # 确保有公共抬头才进行替换
        for header_line in common_header.split('\n'):
            if header_line.strip():  # 只处理非空行
                # 替换首次出现的完整行
                text = re.sub(r'^' + re.escape(header_line.strip()) + r'\n?', '', text, count=1)

    # 删除页码 eg:89/129   这个代码分三步走可以把89/129完全删除
    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
    text = re.sub(r'\s+\d+\s*$', '', text)  # 删除结尾的页码
    text = re.sub(r'\s*\/\s*\d+\s*', '', text)  # 删除形如 /129 的页码

    return text


def extract_common_header(pdf_path):
    pdf_document = PdfReader(pdf_path)
    headers = []
    total_pages = len(pdf_document.pages)

    # 确定要读取的页数和起始页
    if total_pages == 2:
        pages_to_read = 2
        start_page = 0
    else:
        pages_to_read = 3
        middle_page = total_pages // 2
        start_page = max(0, middle_page - 1)

    for i in range(start_page, min(start_page + pages_to_read, total_pages)):
        page = pdf_document.pages[i]
        text = page.extract_text() or ""
        if text:
            # 只取每页的前三行
            first_lines = text.strip().split('\n')[:3]
            headers.append(first_lines)

    if len(headers) < 2:
        return ""  # 如果没有足够的页来比较，返回空字符串

    # 寻找每一行中的公共部分
    common_headers = []
    for lines in zip(*headers):
        # 在每一行中寻找公共单词
        common_line = set(lines[0].split()).intersection(*[set(line.split()) for line in lines[1:]])
        if common_line:
            common_headers.append(' '.join(common_line))

    return '\n'.join(common_headers)


def is_pdf_or_doc(filename):
    # 判断文件是否为PDF或Word文档
    return filename.lower().endswith(('.pdf', '.doc', '.docx'))


def convert_to_pdf(file_path):
    # 假设 docx2pdf 函数已经被定义，这里仅根据文件扩展名来决定是否需要转换
    if file_path.lower().endswith(('.doc', '.docx')):
        return docx2pdf(file_path)
    return file_path

def judge_file_exist(original_path, new_suffix):
    # 提取目录路径和原始文件名
    directory = os.path.dirname(original_path)
    original_filename = os.path.basename(original_path)

    # 替换文件名中的旧后缀为新后缀
    # 假设原始文件名格式为 '2-招标文件_qualification.pdf'
    # 需要替换 '_qualification' 部分为 '_qualification2'
    new_filename = original_filename.replace("_qualification1", f"_{new_suffix}")
    new_filename = new_filename.replace("_qualification2", f"_{new_suffix}")
    # 生成新的文件路径
    new_file_path = os.path.join(directory, new_filename)

    # 检查新文件是否存在
    if os.path.isfile(new_file_path):
        return new_file_path
    else:
        return None
def merge_pdfs(paths, output_path):
    pdf_writer = PdfWriter()
    last_page_text = None  # 用于存储上一个PDF的最后一页的文本

    for path in paths:
        pdf_reader = PdfReader(path)
        pages = pdf_reader.pages
        start_index = 0  # 从第一页开始添加

        # 如果这不是第一个文件，并且有上一个文件的最后一页文本
        if last_page_text is not None and len(pages) > 0:
            current_first_page_text = pages[0].extract_text() if pages[0].extract_text() else ""
            # 比较当前文件的第一页和上一个文件的最后一页的文本
            if current_first_page_text == last_page_text:
                start_index = 1  # 如果相同，跳过当前文件的第一页

        # 添加当前PDF的页面到写入器
        for page in range(start_index, len(pages)):
            pdf_writer.add_page(pages[page])

        # 更新last_page_text为当前PDF的最后一页的文本
        if len(pages) > 0:
            last_page_text = pages[-1].extract_text() if pages[-1].extract_text() else ""

    # 写入合并后的PDF到文件
    with open(output_path, 'wb') as out:
        pdf_writer.write(out)
def merge_and_cleanup(output_pdf_path, suffix_to_merge):
    another_file_path = judge_file_exist(output_pdf_path, suffix_to_merge)
    if another_file_path:
        paths = [output_pdf_path, another_file_path]  # 需要合并的 PDF 文件路径
        merge_pdfs(paths, output_pdf_path)
        os.remove(another_file_path)
        print(f"文件 {another_file_path} 已删除。")

def process_files(file_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix):
    pdf_path = convert_to_pdf(file_path)
    result = extract_pages(pdf_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix)
    if result:
        if output_suffix == "tobidders_notice":
            return result  # 返回包含两个路径的元组
        elif output_suffix == "qualification1":
            merge_and_cleanup(result, "qualification3")
        return result
    return None

def process_input(input_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix):
    if not os.path.exists(output_folder):
        os.makedirs(output_folder)
    generated_files = []

    # 判断输入是目录还是单个文件，并统一处理
    if os.path.isdir(input_path):
        for file_name in os.listdir(input_path):
            file_path = os.path.join(input_path, file_name)
            if is_pdf_or_doc(file_path):
                result = process_files(file_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix)
                if result:
                    if isinstance(result, tuple):
                        generated_files.extend(result)
                    else:
                        generated_files.append(result)
    elif os.path.isfile(input_path) and is_pdf_or_doc(input_path):
        result = process_files(input_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix)
        if result:
            if isinstance(result, tuple):
                generated_files.extend(result)
            else:
                generated_files.append(result)
    else:
        print("提供的路径既不是文件夹也不是PDF文件。")

    return generated_files


def extract_pages_generic(pdf_document, begin_pattern, end_pattern, begin_page, common_header, exclusion_pattern=None,output_suffix="normal"):
    start_page = None
    end_page = None
    for i, page in enumerate(pdf_document.pages):
        text = page.extract_text() or ""
        cleaned_text = clean_page_content(text, common_header)
        if output_suffix=="tobidders_notice":
            if exclusion_pattern and re.search(exclusion_pattern, cleaned_text) and start_page is not None:
                continue
        else:
            if exclusion_pattern and re.search(exclusion_pattern, cleaned_text):
                continue
        if start_page is None and re.search(begin_pattern, cleaned_text) and i > begin_page:
            start_page = i
        if start_page is not None and re.search(end_pattern, cleaned_text) and i > start_page:
            end_page = i
            break
    return start_page, end_page


def extract_pages(pdf_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix):
    try:
        common_header = extract_common_header(pdf_path)
        pdf_document = PdfReader(pdf_path)
        exclusion_pattern = None
        if output_suffix == "tobidders_notice":
            exclusion_pattern = re.compile(r'文件的构成|文件的组成|须对应|需对应|须按照|需按照|须根据|需根据')
            start_page, mid_page, end_page = extract_pages_tobidders_notice(pdf_document, begin_pattern, end_pattern,
                                                                            begin_page, common_header,exclusion_pattern)
            if start_page is None or mid_page is None or end_page is None:
                print(f"first: {output_suffix} 未找到起始或结束页在文件 {pdf_path} 中！尝试备用提取策略。")
                return extract_pages_twice_tobidders_notice(pdf_path, output_folder, output_suffix, common_header)
            path1 = save_extracted_pages(pdf_document, start_page, mid_page, pdf_path, output_folder,
                                         "tobidders_notice_part1")
            path2 = save_extracted_pages(pdf_document, mid_page, end_page, pdf_path, output_folder,
                                         "tobidders_notice_part2")
            return path1, path2
        else:
            # 原有的处理逻辑保持不变
            if output_suffix == "qualification1":
                exclusion_pattern = re.compile(r'文件的构成|文件的组成|须对应|需对应|须按照|需按照|须根据|需根据')
            start_page, end_page = extract_pages_generic(pdf_document, begin_pattern, end_pattern, begin_page, common_header, exclusion_pattern)
            if start_page is None or end_page is None:
                print(f"first: {output_suffix} 未找到起始或结束页在文件 {pdf_path} 中！尝试备用提取策略。")
                return extract_pages_twice(pdf_path, output_folder, output_suffix, common_header)
            elif output_suffix == "qualification1":
                truncate_pdf_main(pdf_path, output_folder, 2, "qualification3")
            return save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix)
    except Exception as e:
        print(f"Error processing {pdf_path}: {e}")
        return None

def extract_pages_tobidders_notice(pdf_document, begin_pattern, end_pattern, begin_page, common_header,exclusion_pattern):
    start_page = None
    mid_page = None
    end_page = None
    for i, page in enumerate(pdf_document.pages):
        text = page.extract_text() or ""
        cleaned_text = clean_page_content(text, common_header)
        if exclusion_pattern and re.search(exclusion_pattern, cleaned_text) and mid_page is not None:
            continue
        if start_page is None and re.search(begin_pattern, cleaned_text) and i > begin_page:
            start_page = i
        if start_page is not None and mid_page is None and re.search(
                r'^\s*[（(]?\s*[一1]\s*[)）]?\s*[、.]*\s*(说\s*明|总\s*则)', cleaned_text, re.MULTILINE):
            mid_page = i
        if start_page is not None and mid_page is not None and re.search(end_pattern, cleaned_text) and i > mid_page:
            end_page = i
            break
    return start_page, mid_page, end_page

def get_patterns_for_procurement():
    begin_pattern = re.compile(
        r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(?:服务|项目|商务).*?要求|'
        r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(?:采购|技术标准).*|'
        r'^[一二三四五六七八九十百千]+、\s*采购清单', re.MULTILINE)
    end_pattern = re.compile(
        r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE)
    return begin_pattern, end_pattern


def get_patterns_for_evaluation_method():
    begin_pattern = re.compile(
        r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(磋商|谈判|评标|评定|评审)(方法|办法).*', re.MULTILINE)
    end_pattern = re.compile(
        r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE)
    return begin_pattern, end_pattern


def get_patterns_for_qualification():
    # # 原始匹配逻辑
    # begin_pattern_original = re.compile(
    #     r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(资格审查).*', re.MULTILINE)
    # end_pattern_original = re.compile(
    #     r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE)

    # 新匹配逻辑
    begin_pattern_new = re.compile(
        r'^资格性检查', re.MULTILINE)
    end_pattern_new = re.compile(
        r'^附件\s*\d+|^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE)

    return  begin_pattern_new, end_pattern_new

def extract_pages_twice_tobidders_notice(pdf_path, output_folder, output_suffix, common_header):   #投标人须知前附表/正文二次提取
    begin_pattern = re.compile(
        r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*(?:(?:投标人|磋商|供应商|谈判供应商|磋商供应商)须知前附表)+'
    )
    end_pattern = re.compile(
        r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+'
    )
    pdf_document = PdfReader(pdf_path)
    exclusion_pattern = re.compile(r'文件的构成|文件的组成|须对应|需对应|须按照|需按照|须根据|需根据')
    # 提取第一部分
    start_page1, end_page1 = extract_pages_generic(pdf_document, begin_pattern, end_pattern, -1, common_header)
    if start_page1 is None or end_page1 is None:
        print(f"second: {output_suffix} 未找到起始或结束页在文件 {pdf_path} 中！")
        return None, None
    # 提取第二部分
    start_page2 = end_page1  # 第二部分的开始页就是第一部分的结束页
    _, end_page2 = extract_pages_generic(pdf_document, end_pattern, end_pattern, start_page2 - 1, common_header,exclusion_pattern)
    if end_page2 is None:
        print(f"second: {output_suffix} 未找到第二部分的结束页在文件 {pdf_path} 中！")
        return None, None

    # 保存提取的页面
    path1 = save_extracted_pages(pdf_document, start_page1, end_page1, pdf_path, output_folder, "tobidders_notice_part1")
    path2 = save_extracted_pages(pdf_document, start_page2, end_page2, pdf_path, output_folder, "tobidders_notice_part2")

    return path1, path2

def extract_pages_twice(pdf_path, output_folder, output_suffix, common_header):
    exclusion_pattern = re.compile(r'文件的构成|文件的组成|须对应|需对应|须按照|需按照|须根据|需根据')
    pdf_document = PdfReader(pdf_path)
    patterns = None
    if output_suffix == "procurement":
        patterns = [get_patterns_for_procurement()]
    elif output_suffix == "evaluation_method" or output_suffix=="qualification2" or output_suffix=="qualification3":
        patterns = [get_patterns_for_evaluation_method()]
    elif output_suffix == "qualification1":
        patterns = [get_patterns_for_qualification()]  # This now returns a tuple of pattern pairs

    # Try each set of patterns until a valid range is found
    for pattern_pair in patterns:
        start_page, end_page = extract_pages_generic(pdf_document, pattern_pair[0], pattern_pair[1], 5, common_header,
                                                     exclusion_pattern)
        if start_page is not None and end_page is not None:
            break
    if start_page is None or end_page is None:
        if output_suffix == "qualification1":
            print(f"second: {output_suffix} 未找到起始或结束页在文件 {pdf_path} 中！")
            print("third:尝试提取评分办法章节...")
            temp=truncate_pdf_main(pdf_path,output_folder,2,"qualification2")
            if len(temp) > 0:
                return temp[0]
            else:
                return None
        else:
            print(f"second: {output_suffix} 未找到起始或结束页在文件 {pdf_path} 中！")
            return ""
    return save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix)


def save_extracted_pages(pdf_document, start_page, end_page, pdf_path, output_folder, output_suffix):
    base_file_name = os.path.splitext(os.path.basename(pdf_path))[0]
    output_pdf_path = os.path.join(output_folder, f"{base_file_name}_{output_suffix}.pdf")
    output_doc = PdfWriter()
    for page_num in range(start_page, end_page + 1):
        output_doc.add_page(pdf_document.pages[page_num])
    with open(output_pdf_path, 'wb') as f:
        output_doc.write(f)
    print(f"{output_suffix} 已截取并保存页面从 {start_page} 到 {end_page} 为 {output_pdf_path}")
    return output_pdf_path


def truncate_pdf_main(input_path, output_folder, selection, output_suffix="default"):
    if selection == 1:
        # 更新的正则表达式以匹配"第x章"和"第x部分"，考虑到可能的空格和其他文字
        begin_pattern = re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(?:服务|项目|商务).*?要求|'
            r'^第[一二三四五六七八九十百千]+(?:章|部分).*?采购.*'
        )
        begin_page = 5
        end_pattern = re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+'
        )
        local_output_suffix = "procurement"
    elif selection == 2:
        begin_pattern = re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(磋商|谈判|评标|评定|评审)(方法|办法).*'
        )
        begin_page = 5
        end_pattern = re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+'
        )
        local_output_suffix = "evaluation_method"
    elif selection == 3:
        begin_pattern = re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分).*?(资格审查).*', re.MULTILINE
        )
        begin_page = 5
        end_pattern = re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE
        )
        local_output_suffix = "qualification1"
    elif selection ==4:     #投标人须知前附表和正文
        begin_page=1
        begin_pattern = re.compile(
            r'^(?:第[一二三四五六七八九十百千]+(?:章|部分)\s*(?:投标人须知|磋商须知|供应商须知)+|(?:一\s*、\s*)?(?:投标人须知|磋商须知|供应商须知)前附表)', re.MULTILINE
        )
        end_pattern=re.compile(
            r'^第[一二三四五六七八九十百千]+(?:章|部分)\s*[\u4e00-\u9fff]+', re.MULTILINE
        )
        local_output_suffix = "tobidders_notice"
    else:
        print("无效的选择")
        return None

    # 如果传入的 output_suffix 是 'default'，则使用本地生成的 output_suffix
    if output_suffix == "default":
        output_suffix = local_output_suffix

    # 调用相应的处理函数
    return process_input(input_path, output_folder, begin_pattern, begin_page, end_pattern, output_suffix)



def truncate_pdf_multiple(input_path, output_folder):
    truncate_files = []
    for selection in range(1, 5):
        files = truncate_pdf_main(input_path, output_folder, selection)
        truncate_files.extend(files)
    return truncate_files


# TODO:交通智能系统和招标(1)(1)文件有问题  sele=4的时候excludsion有问题
if __name__ == "__main__":
    input_path = "C:\\Users\\Administrator\\Desktop\\货物标\\zbfiles"
    output_folder = "C:\\Users\\Administrator\\Desktop\\货物标\\output4"
    # truncate_pdf_multiple(input_path,output_folder)
    selection = 4  # 例如：1 - 商务技术服务要求, 2 - 评标办法, 3 - 资格审查后缀有qualification1和qualification2  4.投标人须知前附表
    generated_files = truncate_pdf_main(input_path, output_folder, selection)