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51a8604dcb
### What problem does this PR solve? Fix context loss caused by separating markdown tables from original text. #6871, #8804. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)
107 lines
4.1 KiB
Python
107 lines
4.1 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright 2025 The InfiniFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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import re
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from markdown import markdown
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class RAGFlowMarkdownParser:
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def __init__(self, chunk_token_num=128):
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self.chunk_token_num = int(chunk_token_num)
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def extract_tables_and_remainder(self, markdown_text, separate_tables=True):
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tables = []
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working_text = markdown_text
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def replace_tables_with_rendered_html(pattern, table_list, render=True):
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new_text = ""
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last_end = 0
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for match in pattern.finditer(working_text):
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raw_table = match.group()
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table_list.append(raw_table)
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if separate_tables:
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# Skip this match (i.e., remove it)
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new_text += working_text[last_end:match.start()] + "\n\n"
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else:
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# Replace with rendered HTML
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html_table = markdown(raw_table, extensions=['markdown.extensions.tables']) if render else raw_table
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new_text += working_text[last_end:match.start()] + html_table + "\n\n"
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last_end = match.end()
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new_text += working_text[last_end:]
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return new_text
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if "|" in markdown_text: # for optimize performance
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# Standard Markdown table
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border_table_pattern = re.compile(
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r'''
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(?:\n|^)
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(?:\|.*?\|.*?\|.*?\n)
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(?:\|(?:\s*[:-]+[-| :]*\s*)\|.*?\n)
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(?:\|.*?\|.*?\|.*?\n)+
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''', re.VERBOSE)
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working_text = replace_tables_with_rendered_html(border_table_pattern, tables)
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# Borderless Markdown table
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no_border_table_pattern = re.compile(
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r'''
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(?:\n|^)
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(?:\S.*?\|.*?\n)
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(?:(?:\s*[:-]+[-| :]*\s*).*?\n)
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(?:\S.*?\|.*?\n)+
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''', re.VERBOSE)
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working_text = replace_tables_with_rendered_html(no_border_table_pattern, tables)
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if "<table>" in working_text.lower(): # for optimize performance
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#HTML table extraction - handle possible html/body wrapper tags
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html_table_pattern = re.compile(
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r'''
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(?:\n|^)
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\s*
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(?:
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# case1: <html><body><table>...</table></body></html>
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(?:<html[^>]*>\s*<body[^>]*>\s*<table[^>]*>.*?</table>\s*</body>\s*</html>)
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# case2: <body><table>...</table></body>
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(?:<body[^>]*>\s*<table[^>]*>.*?</table>\s*</body>)
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# case3: only<table>...</table>
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(?:<table[^>]*>.*?</table>)
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)
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\s*
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(?=\n|$)
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''',
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re.VERBOSE | re.DOTALL | re.IGNORECASE
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)
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def replace_html_tables():
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nonlocal working_text
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new_text = ""
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last_end = 0
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for match in html_table_pattern.finditer(working_text):
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raw_table = match.group()
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tables.append(raw_table)
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if separate_tables:
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new_text += working_text[last_end:match.start()] + "\n\n"
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else:
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new_text += working_text[last_end:match.start()] + raw_table + "\n\n"
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last_end = match.end()
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new_text += working_text[last_end:]
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working_text = new_text
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replace_html_tables()
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return working_text, tables
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