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ragflow / deepdoc /parser /markdown_parser.py
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# -*- coding: utf-8 -*-
#
# Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
#
# 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 re
class RAGFlowMarkdownParser:
def __init__(self, chunk_token_num=128):
self.chunk_token_num = int(chunk_token_num)
def extract_tables_and_remainder(self, markdown_text):
tables = []
remainder = markdown_text
if "|" in markdown_text: # for optimize performance
# Standard Markdown table
border_table_pattern = re.compile(
r'''
(?:\n|^)
(?:\|.*?\|.*?\|.*?\n)
(?:\|(?:\s*[:-]+[-| :]*\s*)\|.*?\n)
(?:\|.*?\|.*?\|.*?\n)+
''', re.VERBOSE)
border_tables = border_table_pattern.findall(markdown_text)
tables.extend(border_tables)
remainder = border_table_pattern.sub('', remainder)
# Borderless Markdown table
no_border_table_pattern = re.compile(
r'''
(?:\n|^)
(?:\S.*?\|.*?\n)
(?:(?:\s*[:-]+[-| :]*\s*).*?\n)
(?:\S.*?\|.*?\n)+
''', re.VERBOSE)
no_border_tables = no_border_table_pattern.findall(remainder)
tables.extend(no_border_tables)
remainder = no_border_table_pattern.sub('', remainder)
if "<table>" in remainder.lower(): # for optimize performance
#HTML table extraction - handle possible html/body wrapper tags
html_table_pattern = re.compile(
r'''
(?:\n|^)
\s*
(?:
# case1: <html><body><table>...</table></body></html>
(?:<html[^>]*>\s*<body[^>]*>\s*<table[^>]*>.*?</table>\s*</body>\s*</html>)
|
# case2: <body><table>...</table></body>
(?:<body[^>]*>\s*<table[^>]*>.*?</table>\s*</body>)
|
# case3: only<table>...</table>
(?:<table[^>]*>.*?</table>)
)
\s*
(?=\n|$)
''',
re.VERBOSE | re.DOTALL | re.IGNORECASE
)
html_tables = html_table_pattern.findall(remainder)
tables.extend(html_tables)
remainder = html_table_pattern.sub('', remainder)
return remainder, tables