mirror of
https://gitee.com/dify_ai/dify.git
synced 2024-12-05 12:48:32 +08:00
3241e4015b
Co-authored-by: jyong <718720800@qq.com>
69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
"""Functionality for splitting text."""
|
|
from __future__ import annotations
|
|
|
|
from typing import (
|
|
Any,
|
|
List,
|
|
Optional,
|
|
)
|
|
|
|
from langchain.text_splitter import RecursiveCharacterTextSplitter
|
|
|
|
|
|
class FixedRecursiveCharacterTextSplitter(RecursiveCharacterTextSplitter):
|
|
def __init__(self, fixed_separator: str = "\n\n", separators: Optional[List[str]] = None, **kwargs: Any):
|
|
"""Create a new TextSplitter."""
|
|
super().__init__(**kwargs)
|
|
self._fixed_separator = fixed_separator
|
|
self._separators = separators or ["\n\n", "\n", " ", ""]
|
|
|
|
def split_text(self, text: str) -> List[str]:
|
|
"""Split incoming text and return chunks."""
|
|
if self._fixed_separator:
|
|
chunks = text.split(self._fixed_separator)
|
|
else:
|
|
chunks = list(text)
|
|
|
|
final_chunks = []
|
|
for chunk in chunks:
|
|
if self._length_function(chunk) > self._chunk_size:
|
|
final_chunks.extend(self.recursive_split_text(chunk))
|
|
else:
|
|
final_chunks.append(chunk)
|
|
|
|
return final_chunks
|
|
|
|
def recursive_split_text(self, text: str) -> List[str]:
|
|
"""Split incoming text and return chunks."""
|
|
final_chunks = []
|
|
# Get appropriate separator to use
|
|
separator = self._separators[-1]
|
|
for _s in self._separators:
|
|
if _s == "":
|
|
separator = _s
|
|
break
|
|
if _s in text:
|
|
separator = _s
|
|
break
|
|
# Now that we have the separator, split the text
|
|
if separator:
|
|
splits = text.split(separator)
|
|
else:
|
|
splits = list(text)
|
|
# Now go merging things, recursively splitting longer texts.
|
|
_good_splits = []
|
|
for s in splits:
|
|
if self._length_function(s) < self._chunk_size:
|
|
_good_splits.append(s)
|
|
else:
|
|
if _good_splits:
|
|
merged_text = self._merge_splits(_good_splits, separator)
|
|
final_chunks.extend(merged_text)
|
|
_good_splits = []
|
|
other_info = self.recursive_split_text(s)
|
|
final_chunks.extend(other_info)
|
|
if _good_splits:
|
|
merged_text = self._merge_splits(_good_splits, separator)
|
|
final_chunks.extend(merged_text)
|
|
return final_chunks
|