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import re
from magic_pdf.libs.boxbase import _is_in_or_part_overlap
from magic_pdf.libs.drop_tag import CONTENT_IN_FOOT_OR_HEADER, PAGE_NO
"""
copy from pre_proc/remove_footer_header.py
"""
def remove_headder_footer_one_page(
text_raw_blocks,
image_bboxes,
table_bboxes,
header_bboxs,
footer_bboxs,
page_no_bboxs,
page_w,
page_h,
):
"""
删除页眉页脚，页码
从line级别进行删除，删除之后观察这个text-block是否是空的，如果是空的，则移动到remove_list中
"""
if 1:
return image_bboxes, table_bboxes, text_raw_blocks, [], [], []
header = []
footer = []
if len(header) == 0:
model_header = header_bboxs
if model_header:
x0 = min([x for x, _, _, _ in model_header])
y0 = min([y for _, y, _, _ in model_header])
x1 = max([x1 for _, _, x1, _ in model_header])
y1 = max([y1 for _, _, _, y1 in model_header])
header = [x0, y0, x1, y1]
if len(footer) == 0:
model_footer = footer_bboxs
if model_footer:
x0 = min([x for x, _, _, _ in model_footer])
y0 = min([y for _, y, _, _ in model_footer])
x1 = max([x1 for _, _, x1, _ in model_footer])
y1 = max([y1 for _, _, _, y1 in model_footer])
footer = [x0, y0, x1, y1]
header_y0 = 0 if len(header) == 0 else header[3]
footer_y0 = page_h if len(footer) == 0 else footer[1]
if page_no_bboxs:
top_part = [b for b in page_no_bboxs if b[3] < page_h / 2]
btn_part = [b for b in page_no_bboxs if b[1] > page_h / 2]
top_max_y0 = max([b[1] for b in top_part]) if top_part else 0
btn_min_y1 = min([b[3] for b in btn_part]) if btn_part else page_h
header_y0 = max(header_y0, top_max_y0)
footer_y0 = min(footer_y0, btn_min_y1)
content_boundry = [0, header_y0, page_w, footer_y0]
header = [0, 0, page_w, header_y0]
footer = [0, footer_y0, page_w, page_h]
"""以上计算出来了页眉页脚的边界，下面开始进行删除"""
text_block_to_remove = []
# 首先检查每个textblock
for blk in text_raw_blocks:
if len(blk["lines"]) > 0:
for line in blk["lines"]:
line_del = []
for span in line["spans"]:
span_del = []
if span["bbox"][3] < header_y0:
span_del.append(span)
elif _is_in_or_part_overlap(
span["bbox"], header
) or _is_in_or_part_overlap(span["bbox"], footer):
span_del.append(span)
for span in span_del:
line["spans"].remove(span)
if not line["spans"]:
line_del.append(line)
for line in line_del:
blk["lines"].remove(line)
else:
# if not blk['lines']:
blk["tag"] = CONTENT_IN_FOOT_OR_HEADER
text_block_to_remove.append(blk)
"""有的时候由于pageNo太小了，总是会有一点和content_boundry重叠一点，被放入正文，因此对于pageNo，进行span粒度的删除"""
page_no_block_2_remove = []
if page_no_bboxs:
for pagenobox in page_no_bboxs:
for block in text_raw_blocks:
if _is_in_or_part_overlap(
pagenobox, block["bbox"]
): # 在span级别删除页码
for line in block["lines"]:
for span in line["spans"]:
if _is_in_or_part_overlap(pagenobox, span["bbox"]):
# span['text'] = ''
span["tag"] = PAGE_NO
# 检查这个block是否只有这一个span，如果是，那么就把这个block也删除
if len(line["spans"]) == 1 and len(block["lines"]) == 1:
page_no_block_2_remove.append(block)
else:
# 测试最后一个是不是页码：规则是，最后一个block仅有1个line,一个span,且text是数字，空格，符号组成，不含字母,并且包含数字
if len(text_raw_blocks) > 0:
text_raw_blocks.sort(key=lambda x: x["bbox"][1], reverse=True)
last_block = text_raw_blocks[0]
if len(last_block["lines"]) == 1:
last_line = last_block["lines"][0]
if len(last_line["spans"]) == 1:
last_span = last_line["spans"][0]
if (
last_span["text"].strip()
and not re.search("[a-zA-Z]", last_span["text"])
and re.search("[0-9]", last_span["text"])
):
last_span["tag"] = PAGE_NO
page_no_block_2_remove.append(last_block)
for b in page_no_block_2_remove:
text_block_to_remove.append(b)
for blk in text_block_to_remove:
if blk in text_raw_blocks:
text_raw_blocks.remove(blk)
text_block_remain = text_raw_blocks
image_bbox_to_remove = [
bbox
for bbox in image_bboxes
if not _is_in_or_part_overlap(bbox, content_boundry)
]
image_bbox_remain = [
bbox for bbox in image_bboxes if _is_in_or_part_overlap(bbox, content_boundry)
]
table_bbox_to_remove = [
bbox
for bbox in table_bboxes
if not _is_in_or_part_overlap(bbox, content_boundry)
]
table_bbox_remain = [
bbox for bbox in table_bboxes if _is_in_or_part_overlap(bbox, content_boundry)
]
# 1, 2, 3
return (
image_bbox_remain,
table_bbox_remain,
text_block_remain,
text_block_to_remove,
image_bbox_to_remove,
table_bbox_to_remove,
)
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