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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import copy
from tika import parser
import re
from io import BytesIO
from rag.nlp import bullets_category, is_english, tokenize, remove_contents_table, \
hierarchical_merge, make_colon_as_title, naive_merge, random_choices, tokenize_table, add_positions, \
tokenize_chunks, find_codec
from rag.nlp import rag_tokenizer
from deepdoc.parser import PdfParser, DocxParser, PlainParser, HtmlParser
class Pdf(PdfParser):
def __call__(self, filename, binary=None, from_page=0,
to_page=100000, zoomin=3, callback=None):
callback(msg="OCR is running...")
self.__images__(
filename if not binary else binary,
zoomin,
from_page,
to_page,
callback)
callback(msg="OCR finished")
from timeit import default_timer as timer
start = timer()
self._layouts_rec(zoomin)
callback(0.67, "Layout analysis finished")
print("layouts:", timer() - start)
self._table_transformer_job(zoomin)
callback(0.68, "Table analysis finished")
self._text_merge()
tbls = self._extract_table_figure(True, zoomin, True, True)
self._naive_vertical_merge()
self._filter_forpages()
self._merge_with_same_bullet()
callback(0.75, "Text merging finished.")
callback(0.8, "Text extraction finished")
return [(b["text"] + self._line_tag(b, zoomin), b.get("layoutno", ""))
for b in self.boxes], tbls
def chunk(filename, binary=None, from_page=0, to_page=100000,
lang="Chinese", callback=None, **kwargs):
"""
Supported file formats are docx, pdf, txt.
Since a book is long and not all the parts are useful, if it's a PDF,
please setup the page ranges for every book in order eliminate negative effects and save elapsed computing time.
"""
doc = {
"docnm_kwd": filename,
"title_tks": rag_tokenizer.tokenize(re.sub(r"\.[a-zA-Z]+$", "", filename))
}
doc["title_sm_tks"] = rag_tokenizer.fine_grained_tokenize(doc["title_tks"])
pdf_parser = None
sections, tbls = [], []
if re.search(r"\.docx$", filename, re.IGNORECASE):
callback(0.1, "Start to parse.")
doc_parser = DocxParser()
# TODO: table of contents need to be removed
sections, tbls = doc_parser(
binary if binary else filename, from_page=from_page, to_page=to_page)
remove_contents_table(sections, eng=is_english(
random_choices([t for t, _ in sections], k=200)))
tbls = [((None, lns), None) for lns in tbls]
callback(0.8, "Finish parsing.")
elif re.search(r"\.pdf$", filename, re.IGNORECASE):
pdf_parser = Pdf() if kwargs.get(
"parser_config", {}).get(
"layout_recognize", True) else PlainParser()
sections, tbls = pdf_parser(filename if not binary else binary,
from_page=from_page, to_page=to_page, callback=callback)
elif re.search(r"\.txt$", filename, re.IGNORECASE):
callback(0.1, "Start to parse.")
txt = ""
if binary:
encoding = find_codec(binary)
txt = binary.decode(encoding, errors="ignore")
else:
with open(filename, "r") as f:
while True:
l = f.readline()
if not l:
break
txt += l
sections = txt.split("\n")
sections = [(l, "") for l in sections if l]
remove_contents_table(sections, eng=is_english(
random_choices([t for t, _ in sections], k=200)))
callback(0.8, "Finish parsing.")
elif re.search(r"\.(htm|html)$", filename, re.IGNORECASE):
callback(0.1, "Start to parse.")
sections = HtmlParser()(filename, binary)
sections = [(l, "") for l in sections if l]
remove_contents_table(sections, eng=is_english(
random_choices([t for t, _ in sections], k=200)))
callback(0.8, "Finish parsing.")
elif re.search(r"\.doc$", filename, re.IGNORECASE):
callback(0.1, "Start to parse.")
binary = BytesIO(binary)
doc_parsed = parser.from_buffer(binary)
sections = doc_parsed['content'].split('\n')
sections = [(l, "") for l in sections if l]
remove_contents_table(sections, eng=is_english(
random_choices([t for t, _ in sections], k=200)))
callback(0.8, "Finish parsing.")
else:
raise NotImplementedError(
"file type not supported yet(doc, docx, pdf, txt supported)")
make_colon_as_title(sections)
bull = bullets_category(
[t for t in random_choices([t for t, _ in sections], k=100)])
if bull >= 0:
chunks = ["\n".join(ck)
for ck in hierarchical_merge(bull, sections, 5)]
else:
sections = [s.split("@") for s, _ in sections]
sections = [(pr[0], "@" + pr[1]) if len(pr) == 2 else (pr[0], '') for pr in sections ]
chunks = naive_merge(
sections, kwargs.get(
"chunk_token_num", 256), kwargs.get(
"delimer", "\n。；！？"))
# is it English
# is_english(random_choices([t for t, _ in sections], k=218))
eng = lang.lower() == "english"
res = tokenize_table(tbls, doc, eng)
res.extend(tokenize_chunks(chunks, doc, eng, pdf_parser))
return res
if __name__ == "__main__":
import sys
def dummy(prog=None, msg=""):
pass
chunk(sys.argv[1], from_page=1, to_page=10, callback=dummy)
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