Implementation:Infiniflow Ragflow QueryBase

Knowledge Sources	Infiniflow_Ragflow
Domains	Search, NLP
Last Updated	2026-02-12 06:00 GMT

Overview

Concrete abstract base class for search query construction with text analysis utilities for Chinese and English text processing provided by the RAGFlow common library.

Description

The QueryBase class provides static methods for detecting Chinese text, escaping special regex characters, removing common stop words in both Chinese and English, adding spaces between mixed CJK/Latin text, and an abstract question method for subclasses to implement query generation strategies.

Usage

Subclass QueryBase when implementing a new search query construction strategy that needs multilingual text preprocessing. The static utility methods can also be used standalone.

Code Reference

Source Location

• Repository: Infiniflow_Ragflow
• File: common/query_base.py
• Lines: 1-73

Signature

class QueryBase:
    @staticmethod
    def is_chinese(line: str) -> bool:
        """Detect if text is primarily Chinese."""

    @staticmethod
    def sub_special_char(line: str) -> str:
        """Escape special regex characters."""

    @staticmethod
    def rmWWW(txt: str) -> str:
        """Remove common stop words (Chinese and English)."""

    @staticmethod
    def add_space_between_eng_zh(txt: str) -> str:
        """Add spaces between English and Chinese text."""

    def question(self, text: str, tbl: str, min_match: float):
        """Abstract method for query generation."""

Import

from common.query_base import QueryBase

I/O Contract

Inputs

Name	Type	Required	Description
line	str	Yes	Text to analyze for language detection
txt	str	Yes	Text to preprocess
text	str	Yes	Query text (for question method)
tbl	str	Yes	Target table/index name
min_match	float	Yes	Minimum match threshold

Outputs

Name	Type	Description
is_chinese() returns	bool	Whether text is primarily Chinese
rmWWW() returns	str	Text with stop words removed
question() returns	varies	Constructed query (subclass-defined)

Usage Examples

from common.query_base import QueryBase

is_zh = QueryBase.is_chinese("你好世界 hello")  # True
cleaned = QueryBase.rmWWW("the quick brown fox")  # "quick brown fox"
spaced = QueryBase.add_space_between_eng_zh("hello你好")  # "hello 你好"

Related Pages

• Environment:Infiniflow_Ragflow_Python_Runtime