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pdf2txt.py
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import glob
import pdfplumber
import re
from collections import defaultdict
import json
import os
class PDFProcessor:
def __init__(self, filepath):
self.filepath = filepath
self.pdf = pdfplumber.open(filepath)
self.all_text = defaultdict(dict)
self.allrow = 0
self.last_num = 0
def check_lines(self, page, top, buttom):
lines = page.extract_words()[::]
text = ''
last_top = 0
last_check = 0
for l in range(len(lines)):
each_line = lines[l]
check_re = '(?:。|；|单位：元|单位：万元|币种：人民币|\d|报告(?:全文)?(?:（修订版）|（修订稿）|（更正后）)?)$'
if top == '' and buttom == '':
if abs(last_top - each_line['top']) <= 2:
text = text + each_line['text']
elif last_check > 0 and (page.height * 0.9 - each_line['top']) > 0 and not re.search(check_re, text):
text = text + each_line['text']
else:
text = text + '\n' + each_line['text']
elif top == '':
if each_line['top'] > buttom:
if abs(last_top - each_line['top']) <= 2:
text = text + each_line['text']
elif last_check > 0 and (page.height * 0.85 - each_line['top']) > 0 and not re.search(check_re,
text):
text = text + each_line['text']
else:
text = text + '\n' + each_line['text']
else:
if each_line['top'] < top and each_line['top'] > buttom:
if abs(last_top - each_line['top']) <= 2:
text = text + each_line['text']
elif last_check > 0 and (page.height * 0.85 - each_line['top']) > 0 and not re.search(check_re,
text):
text = text + each_line['text']
else:
text = text + '\n' + each_line['text']
last_top = each_line['top']
last_check = each_line['x1'] - page.width * 0.85
return text
def drop_empty_cols(self, data):
# 删除所有列为空数据的列
transposed_data = list(map(list, zip(*data)))
filtered_data = [col for col in transposed_data if not all(cell == '' for cell in col)]
result = list(map(list, zip(*filtered_data)))
return result
def extract_text_and_tables(self, page):
buttom = 0
tables = page.find_tables(table_settings={'intersection_x_tolerance': 1})
if len(tables) >= 1:
count = len(tables)
for table in tables:
if table.bbox[3] < buttom:
pass
else:
count -= 1
top = table.bbox[1]
text = self.check_lines(page, top, buttom)
text_list = text.split('\n')
for _t in range(len(text_list)):
self.all_text[self.allrow] = {'page': page.page_number, 'allrow': self.allrow,
'type': 'text', 'inside': text_list[_t]}
self.allrow += 1
buttom = table.bbox[3]
new_table = table.extract()
r_count = 0
for r in range(len(new_table)):
row = new_table[r]
if row[0] is None:
r_count += 1
for c in range(len(row)):
if row[c] is not None and row[c] not in ['', ' ']:
if new_table[r - r_count][c] is None:
new_table[r - r_count][c] = row[c]
else:
new_table[r - r_count][c] += row[c]
new_table[r][c] = None
else:
r_count = 0
end_table = []
for row in new_table:
if row[0] != None:
cell_list = []
cell_check = False
for cell in row:
if cell != None:
cell = cell.replace('\n', '')
else:
cell = ''
if cell != '':
cell_check = True
cell_list.append(cell)
if cell_check == True:
end_table.append(cell_list)
end_table = self.drop_empty_cols(end_table)
for row in end_table:
self.all_text[self.allrow] = {'page': page.page_number, 'allrow': self.allrow,
'type': 'excel', 'inside': str(row)}
# self.all_text[self.allrow] = {'page': page.page_number, 'allrow': self.allrow, 'type': 'excel',
# 'inside': ' '.join(row)}
self.allrow += 1
if count == 0:
text = self.check_lines(page, '', buttom)
text_list = text.split('\n')
for _t in range(len(text_list)):
self.all_text[self.allrow] = {'page': page.page_number, 'allrow': self.allrow,
'type': 'text', 'inside': text_list[_t]}
self.allrow += 1
else:
text = self.check_lines(page, '', '')
text_list = text.split('\n')
for _t in range(len(text_list)):
self.all_text[self.allrow] = {'page': page.page_number, 'allrow': self.allrow,
'type': 'text', 'inside': text_list[_t]}
self.allrow += 1
first_re = '[^计](?:报告(?:全文)?(?:（修订版）|（修订稿）|（更正后）)?)$'
end_re = '^(?:\d|\\|\/|第|共|页|-|_| ){1,}'
if self.last_num == 0:
try:
first_text = str(self.all_text[1]['inside'])
end_text = str(self.all_text[len(self.all_text) - 1]['inside'])
if re.search(first_re, first_text) and not '[' in end_text:
self.all_text[1]['type'] = '页眉'
if re.search(end_re, end_text) and not '[' in end_text:
self.all_text[len(self.all_text) - 1]['type'] = '页脚'
except:
print(page.page_number)
else:
try:
first_text = str(self.all_text[self.last_num + 2]['inside'])
end_text = str(self.all_text[len(self.all_text) - 1]['inside'])
if re.search(first_re, first_text) and '[' not in end_text:
self.all_text[self.last_num + 2]['type'] = '页眉'
if re.search(end_re, end_text) and '[' not in end_text:
self.all_text[len(self.all_text) - 1]['type'] = '页脚'
except:
print(page.page_number)
self.last_num = len(self.all_text) - 1
def process_pdf(self):
for i in range(len(self.pdf.pages)):
self.extract_text_and_tables(self.pdf.pages[i])
def save_all_text(self, path):
for key in self.all_text.keys():
with open(path, 'a+', encoding='utf-8') as file:
file.write(json.dumps(self.all_text[key], ensure_ascii=False) + '\n')
def process_all_pdfs_in_folder(folder_path):
file_paths = glob.glob(f'{folder_path}/*')
file_paths = sorted(file_paths, reverse=True)
for file_path in file_paths:
print(file_path)
try:
processor = PDFProcessor(file_path)
processor.process_pdf()
if not os.path.exists(file_path):
os.makedirs('alltxt')
save_path = 'alltxt/' + file_path.split('/')[-1].replace('.pdf', '.txt')
processor.save_all_text(save_path)
except:
print('check')
folder_path = 'allpdf'
process_all_pdfs_in_folder(folder_path)