import copy from loguru import logger from magic_pdf.libs.Constants import LINES_DELETED, CROSS_PAGE from magic_pdf.libs.ocr_content_type import BlockType, ContentType LINE_STOP_FLAG = ('.', '!', '?', '。', '！', '？', ')', '）', '"', '”', ':', '：', ';', '；') LIST_END_FLAG = ('.', '。', ';', '；') class ListLineTag: IS_LIST_START_LINE = "is_list_start_line" IS_LIST_END_LINE = "is_list_end_line" def __process_blocks(blocks): # 对所有block预处理 # 1.通过title和interline_equation将block分组 # 2.bbox边界根据line信息重置 result = [] current_group = [] for i in range(len(blocks)): current_block = blocks[i] # 如果当前块是 text 类型 if current_block['type'] == 'text': current_block["bbox_fs"] = copy.deepcopy(current_block["bbox"]) if 'lines' in current_block and len(current_block["lines"]) > 0: current_block['bbox_fs'] = [min([line['bbox'][0] for line in current_block['lines']]), min([line['bbox'][1] for line in current_block['lines']]), max([line['bbox'][2] for line in current_block['lines']]), max([line['bbox'][3] for line in current_block['lines']])] current_group.append(current_block) # 检查下一个块是否存在 if i + 1 < len(blocks): next_block = blocks[i + 1] # 如果下一个块不是 text 类型且是 title 或 interline_equation 类型 if next_block['type'] in ['title', 'interline_equation']: result.append(current_group) current_group = [] # 处理最后一个 group if current_group: result.append(current_group) return result def __is_list_or_index_block(block): # 一个block如果是list block 应该同时满足以下特征 # 1.block内有多个line 2.block 内有多个line左侧顶格写 3.block内有多个line 右侧不顶格（狗牙状） # 1.block内有多个line 2.block 内有多个line左侧顶格写 3.多个line以endflag结尾 # 1.block内有多个line 2.block 内有多个line左侧顶格写 3.block内有多个line 左侧不顶格 # index block 是一种特殊的list block # 一个block如果是index block 应该同时满足以下特征 # 1.block内有多个line 2.block 内有多个line两侧均顶格写 3.line的开头或者结尾均为数字 if len(block['lines']) >= 2: first_line = block['lines'][0] line_height = first_line['bbox'][3] - first_line['bbox'][1] block_weight = block['bbox_fs'][2] - block['bbox_fs'][0] left_close_num = 0 left_not_close_num = 0 right_not_close_num = 0 right_close_num = 0 lines_text_list = [] multiple_para_flag = False last_line = block['lines'][-1] # 如果首行左边不顶格而右边顶格,末行左边顶格而右边不顶格 （第一行可能可以右边不顶格） if (first_line['bbox'][0] - block['bbox_fs'][0] > line_height / 2 and # block['bbox_fs'][2] - first_line['bbox'][2] < line_height and abs(last_line['bbox'][0] - block['bbox_fs'][0]) < line_height / 2 and block['bbox_fs'][2] - last_line['bbox'][2] > line_height ): multiple_para_flag = True for line in block['lines']: line_text = "" for span in line['spans']: span_type = span['type'] if span_type == ContentType.Text: line_text += span['content'].strip() lines_text_list.append(line_text) # 计算line左侧顶格数量是否大于2，是否顶格用abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height/2 来判断 if abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height / 2: left_close_num += 1 elif line['bbox'][0] - block['bbox_fs'][0] > line_height: # logger.info(f"{line_text}, {block['bbox_fs']}, {line['bbox']}") left_not_close_num += 1 # 计算右侧是否顶格 if abs(block['bbox_fs'][2] - line['bbox'][2]) < line_height: right_close_num += 1 else: # 右侧不顶格情况下是否有一段距离，拍脑袋用0.3block宽度做阈值 closed_area = 0.26 * block_weight # closed_area = 5 * line_height if block['bbox_fs'][2] - line['bbox'][2] > closed_area: right_not_close_num += 1 # 判断lines_text_list中的元素是否有超过80%都以LIST_END_FLAG结尾 line_end_flag = False # 判断lines_text_list中的元素是否有超过80%都以数字开头或都以数字结尾 line_num_flag = False num_start_count = 0 num_end_count = 0 flag_end_count = 0 if len(lines_text_list) > 0: for line_text in lines_text_list: if len(line_text) > 0: if line_text[-1] in LIST_END_FLAG: flag_end_count += 1 if line_text[0].isdigit(): num_start_count += 1 if line_text[-1].isdigit(): num_end_count += 1 if flag_end_count / len(lines_text_list) >= 0.8: line_end_flag = True if num_start_count / len(lines_text_list) >= 0.8 or num_end_count / len(lines_text_list) >= 0.8: line_num_flag = True # 有的目录右侧不贴边, 目前认为左边或者右边有一边全贴边，且符合数字规则极为index if ((left_close_num/len(block['lines']) >= 0.8 or right_close_num/len(block['lines']) >= 0.8) and line_num_flag ): for line in block['lines']: line[ListLineTag.IS_LIST_START_LINE] = True return BlockType.Index # @TODO 全部line都居中的特殊list识别，每行都需要换行，特征是多行，且大多数行都前后not_close,每line中点x坐标接近 elif left_close_num >= 2 and ( right_not_close_num >= 2 or line_end_flag or left_not_close_num >= 2) and not multiple_para_flag: # 处理一种特殊的没有缩进的list，所有行都贴左边，通过右边的空隙判断是否是item尾 if left_close_num / len(block['lines']) > 0.8: # 这种是每个item只有一行，且左边都贴边的短item list if flag_end_count == 0 and right_close_num / len(block['lines']) < 0.5: for line in block['lines']: if abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height / 2: line[ListLineTag.IS_LIST_START_LINE] = True # 这种是大部分line item 都有结束标识符的情况，按结束标识符区分不同item elif line_end_flag: for i, line in enumerate(block['lines']): if lines_text_list[i][-1] in LIST_END_FLAG: line[ListLineTag.IS_LIST_END_LINE] = True if i + 1 < len(block['lines']): block['lines'][i+1][ListLineTag.IS_LIST_START_LINE] = True # line item基本没有结束标识符，而且也没有缩进，按右侧空隙判断哪些是item end else: line_start_flag = False for i, line in enumerate(block['lines']): if line_start_flag: line[ListLineTag.IS_LIST_START_LINE] = True line_start_flag = False # elif abs(block['bbox_fs'][2] - line['bbox'][2]) > line_height: if abs(block['bbox_fs'][2] - line['bbox'][2]) > 0.1 * block_weight: line[ListLineTag.IS_LIST_END_LINE] = True line_start_flag = True # 一种有缩进的特殊有序list,start line 左侧不贴边且以数字开头，end line 以 IS_LIST_END_LINE 结尾且数量和start line 一致 elif num_start_count >= 2 and num_start_count == flag_end_count: # 简单一点先不考虑左侧不贴边的情况 for i, line in enumerate(block['lines']): if lines_text_list[i][0].isdigit(): line[ListLineTag.IS_LIST_START_LINE] = True if lines_text_list[i][-1] in LIST_END_FLAG: line[ListLineTag.IS_LIST_END_LINE] = True else: # 正常有缩进的list处理 for line in block['lines']: if abs(block['bbox_fs'][0] - line['bbox'][0]) < line_height / 2: line[ListLineTag.IS_LIST_START_LINE] = True if abs(block['bbox_fs'][2] - line['bbox'][2]) > line_height: line[ListLineTag.IS_LIST_END_LINE] = True return BlockType.List else: return BlockType.Text else: return BlockType.Text def __merge_2_text_blocks(block1, block2): if len(block1['lines']) > 0: first_line = block1['lines'][0] line_height = first_line['bbox'][3] - first_line['bbox'][1] block1_weight = block1['bbox'][2] - block1['bbox'][0] block2_weight = block2['bbox'][2] - block2['bbox'][0] min_block_weight = min(block1_weight, block2_weight) if abs(block1['bbox_fs'][0] - first_line['bbox'][0]) < line_height / 2: last_line = block2['lines'][-1] if len(last_line['spans']) > 0: last_span = last_line['spans'][-1] line_height = last_line['bbox'][3] - last_line['bbox'][1] if (abs(block2['bbox_fs'][2] - last_line['bbox'][2]) < line_height and not last_span['content'].endswith(LINE_STOP_FLAG) and # 两个block宽度差距超过2倍也不合并 abs(block1_weight - block2_weight) < min_block_weight ): if block1['page_num'] != block2['page_num']: for line in block1['lines']: for span in line['spans']: span[CROSS_PAGE] = True block2['lines'].extend(block1['lines']) block1['lines'] = [] block1[LINES_DELETED] = True return block1, block2 def __merge_2_list_blocks(block1, block2): if block1['page_num'] != block2['page_num']: for line in block1['lines']: for span in line['spans']: span[CROSS_PAGE] = True block2['lines'].extend(block1['lines']) block1['lines'] = [] block1[LINES_DELETED] = True return block1, block2 def __is_list_group(text_blocks_group): # list group的特征是一个group内的所有block都满足以下条件 # 1.每个block都不超过3行 2. 每个block 的左边界都比较接近(逻辑简单点先不加这个规则) for block in text_blocks_group: if len(block['lines']) > 3: return False return True def __para_merge_page(blocks): page_text_blocks_groups = __process_blocks(blocks) for text_blocks_group in page_text_blocks_groups: if len(text_blocks_group) > 0: # 需要先在合并前对所有block判断是否为list or index block for block in text_blocks_group: block_type = __is_list_or_index_block(block) block['type'] = block_type # logger.info(f"{block['type']}:{block}") if len(text_blocks_group) > 1: # 在合并前判断这个group 是否是一个 list group is_list_group = __is_list_group(text_blocks_group) # 倒序遍历 for i in range(len(text_blocks_group) - 1, -1, -1): current_block = text_blocks_group[i] # 检查是否有前一个块 if i - 1 >= 0: prev_block = text_blocks_group[i - 1] if current_block['type'] == 'text' and prev_block['type'] == 'text' and not is_list_group: __merge_2_text_blocks(current_block, prev_block) elif ( (current_block['type'] == BlockType.List and prev_block['type'] == BlockType.List) or (current_block['type'] == BlockType.Index and prev_block['type'] == BlockType.Index) ): __merge_2_list_blocks(current_block, prev_block) else: continue def para_split(pdf_info_dict, debug_mode=False): all_blocks = [] for page_num, page in pdf_info_dict.items(): blocks = copy.deepcopy(page['preproc_blocks']) for block in blocks: block['page_num'] = page_num all_blocks.extend(blocks) __para_merge_page(all_blocks) for page_num, page in pdf_info_dict.items(): page['para_blocks'] = [] for block in all_blocks: if block['page_num'] == page_num: page['para_blocks'].append(block) if __name__ == '__main__': input_blocks = [] # 调用函数 groups = __process_blocks(input_blocks) for group_index, group in enumerate(groups): print(f"Group {group_index}: {group}")