mirror of
https://github.com/hwchase17/langchain
synced 2024-11-08 07:10:35 +00:00
1252ccce6f
- **Description:** Haskell language support added in text_splitter module - **Dependencies:** No - **Twitter handle:** @nisargtr If no one reviews your PR within a few days, please @-mention one of @baskaryan, @eyurtsev, @hwchase17. --------- Co-authored-by: Bagatur <baskaryan@gmail.com>
618 lines
20 KiB
Python
618 lines
20 KiB
Python
from __future__ import annotations
|
|
|
|
import re
|
|
from typing import Any, List, Optional
|
|
|
|
from langchain_text_splitters.base import Language, TextSplitter
|
|
|
|
|
|
class CharacterTextSplitter(TextSplitter):
|
|
"""Splitting text that looks at characters."""
|
|
|
|
def __init__(
|
|
self, separator: str = "\n\n", is_separator_regex: bool = False, **kwargs: Any
|
|
) -> None:
|
|
"""Create a new TextSplitter."""
|
|
super().__init__(**kwargs)
|
|
self._separator = separator
|
|
self._is_separator_regex = is_separator_regex
|
|
|
|
def split_text(self, text: str) -> List[str]:
|
|
"""Split incoming text and return chunks."""
|
|
# First we naively split the large input into a bunch of smaller ones.
|
|
separator = (
|
|
self._separator if self._is_separator_regex else re.escape(self._separator)
|
|
)
|
|
splits = _split_text_with_regex(text, separator, self._keep_separator)
|
|
_separator = "" if self._keep_separator else self._separator
|
|
return self._merge_splits(splits, _separator)
|
|
|
|
|
|
def _split_text_with_regex(
|
|
text: str, separator: str, keep_separator: bool
|
|
) -> List[str]:
|
|
# Now that we have the separator, split the text
|
|
if separator:
|
|
if keep_separator:
|
|
# The parentheses in the pattern keep the delimiters in the result.
|
|
_splits = re.split(f"({separator})", text)
|
|
splits = [_splits[i] + _splits[i + 1] for i in range(1, len(_splits), 2)]
|
|
if len(_splits) % 2 == 0:
|
|
splits += _splits[-1:]
|
|
splits = [_splits[0]] + splits
|
|
else:
|
|
splits = re.split(separator, text)
|
|
else:
|
|
splits = list(text)
|
|
return [s for s in splits if s != ""]
|
|
|
|
|
|
class RecursiveCharacterTextSplitter(TextSplitter):
|
|
"""Splitting text by recursively look at characters.
|
|
|
|
Recursively tries to split by different characters to find one
|
|
that works.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
separators: Optional[List[str]] = None,
|
|
keep_separator: bool = True,
|
|
is_separator_regex: bool = False,
|
|
**kwargs: Any,
|
|
) -> None:
|
|
"""Create a new TextSplitter."""
|
|
super().__init__(keep_separator=keep_separator, **kwargs)
|
|
self._separators = separators or ["\n\n", "\n", " ", ""]
|
|
self._is_separator_regex = is_separator_regex
|
|
|
|
def _split_text(self, text: str, separators: List[str]) -> List[str]:
|
|
"""Split incoming text and return chunks."""
|
|
final_chunks = []
|
|
# Get appropriate separator to use
|
|
separator = separators[-1]
|
|
new_separators = []
|
|
for i, _s in enumerate(separators):
|
|
_separator = _s if self._is_separator_regex else re.escape(_s)
|
|
if _s == "":
|
|
separator = _s
|
|
break
|
|
if re.search(_separator, text):
|
|
separator = _s
|
|
new_separators = separators[i + 1 :]
|
|
break
|
|
|
|
_separator = separator if self._is_separator_regex else re.escape(separator)
|
|
splits = _split_text_with_regex(text, _separator, self._keep_separator)
|
|
|
|
# Now go merging things, recursively splitting longer texts.
|
|
_good_splits = []
|
|
_separator = "" if self._keep_separator else separator
|
|
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 = []
|
|
if not new_separators:
|
|
final_chunks.append(s)
|
|
else:
|
|
other_info = self._split_text(s, new_separators)
|
|
final_chunks.extend(other_info)
|
|
if _good_splits:
|
|
merged_text = self._merge_splits(_good_splits, _separator)
|
|
final_chunks.extend(merged_text)
|
|
return final_chunks
|
|
|
|
def split_text(self, text: str) -> List[str]:
|
|
return self._split_text(text, self._separators)
|
|
|
|
@classmethod
|
|
def from_language(
|
|
cls, language: Language, **kwargs: Any
|
|
) -> RecursiveCharacterTextSplitter:
|
|
separators = cls.get_separators_for_language(language)
|
|
return cls(separators=separators, is_separator_regex=True, **kwargs)
|
|
|
|
@staticmethod
|
|
def get_separators_for_language(language: Language) -> List[str]:
|
|
if language == Language.CPP:
|
|
return [
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
# Split along function definitions
|
|
"\nvoid ",
|
|
"\nint ",
|
|
"\nfloat ",
|
|
"\ndouble ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.GO:
|
|
return [
|
|
# Split along function definitions
|
|
"\nfunc ",
|
|
"\nvar ",
|
|
"\nconst ",
|
|
"\ntype ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.JAVA:
|
|
return [
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
# Split along method definitions
|
|
"\npublic ",
|
|
"\nprotected ",
|
|
"\nprivate ",
|
|
"\nstatic ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.KOTLIN:
|
|
return [
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
# Split along method definitions
|
|
"\npublic ",
|
|
"\nprotected ",
|
|
"\nprivate ",
|
|
"\ninternal ",
|
|
"\ncompanion ",
|
|
"\nfun ",
|
|
"\nval ",
|
|
"\nvar ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\nwhen ",
|
|
"\ncase ",
|
|
"\nelse ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.JS:
|
|
return [
|
|
# Split along function definitions
|
|
"\nfunction ",
|
|
"\nconst ",
|
|
"\nlet ",
|
|
"\nvar ",
|
|
"\nclass ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
"\ndefault ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.TS:
|
|
return [
|
|
"\nenum ",
|
|
"\ninterface ",
|
|
"\nnamespace ",
|
|
"\ntype ",
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
# Split along function definitions
|
|
"\nfunction ",
|
|
"\nconst ",
|
|
"\nlet ",
|
|
"\nvar ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
"\ndefault ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.PHP:
|
|
return [
|
|
# Split along function definitions
|
|
"\nfunction ",
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nforeach ",
|
|
"\nwhile ",
|
|
"\ndo ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.PROTO:
|
|
return [
|
|
# Split along message definitions
|
|
"\nmessage ",
|
|
# Split along service definitions
|
|
"\nservice ",
|
|
# Split along enum definitions
|
|
"\nenum ",
|
|
# Split along option definitions
|
|
"\noption ",
|
|
# Split along import statements
|
|
"\nimport ",
|
|
# Split along syntax declarations
|
|
"\nsyntax ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.PYTHON:
|
|
return [
|
|
# First, try to split along class definitions
|
|
"\nclass ",
|
|
"\ndef ",
|
|
"\n\tdef ",
|
|
# Now split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.RST:
|
|
return [
|
|
# Split along section titles
|
|
"\n=+\n",
|
|
"\n-+\n",
|
|
"\n\\*+\n",
|
|
# Split along directive markers
|
|
"\n\n.. *\n\n",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.RUBY:
|
|
return [
|
|
# Split along method definitions
|
|
"\ndef ",
|
|
"\nclass ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nunless ",
|
|
"\nwhile ",
|
|
"\nfor ",
|
|
"\ndo ",
|
|
"\nbegin ",
|
|
"\nrescue ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.RUST:
|
|
return [
|
|
# Split along function definitions
|
|
"\nfn ",
|
|
"\nconst ",
|
|
"\nlet ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nwhile ",
|
|
"\nfor ",
|
|
"\nloop ",
|
|
"\nmatch ",
|
|
"\nconst ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.SCALA:
|
|
return [
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
"\nobject ",
|
|
# Split along method definitions
|
|
"\ndef ",
|
|
"\nval ",
|
|
"\nvar ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\nmatch ",
|
|
"\ncase ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.SWIFT:
|
|
return [
|
|
# Split along function definitions
|
|
"\nfunc ",
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
"\nstruct ",
|
|
"\nenum ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\ndo ",
|
|
"\nswitch ",
|
|
"\ncase ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.MARKDOWN:
|
|
return [
|
|
# First, try to split along Markdown headings (starting with level 2)
|
|
"\n#{1,6} ",
|
|
# Note the alternative syntax for headings (below) is not handled here
|
|
# Heading level 2
|
|
# ---------------
|
|
# End of code block
|
|
"```\n",
|
|
# Horizontal lines
|
|
"\n\\*\\*\\*+\n",
|
|
"\n---+\n",
|
|
"\n___+\n",
|
|
# Note that this splitter doesn't handle horizontal lines defined
|
|
# by *three or more* of ***, ---, or ___, but this is not handled
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.LATEX:
|
|
return [
|
|
# First, try to split along Latex sections
|
|
"\n\\\\chapter{",
|
|
"\n\\\\section{",
|
|
"\n\\\\subsection{",
|
|
"\n\\\\subsubsection{",
|
|
# Now split by environments
|
|
"\n\\\\begin{enumerate}",
|
|
"\n\\\\begin{itemize}",
|
|
"\n\\\\begin{description}",
|
|
"\n\\\\begin{list}",
|
|
"\n\\\\begin{quote}",
|
|
"\n\\\\begin{quotation}",
|
|
"\n\\\\begin{verse}",
|
|
"\n\\\\begin{verbatim}",
|
|
# Now split by math environments
|
|
"\n\\\begin{align}",
|
|
"$$",
|
|
"$",
|
|
# Now split by the normal type of lines
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.HTML:
|
|
return [
|
|
# First, try to split along HTML tags
|
|
"<body",
|
|
"<div",
|
|
"<p",
|
|
"<br",
|
|
"<li",
|
|
"<h1",
|
|
"<h2",
|
|
"<h3",
|
|
"<h4",
|
|
"<h5",
|
|
"<h6",
|
|
"<span",
|
|
"<table",
|
|
"<tr",
|
|
"<td",
|
|
"<th",
|
|
"<ul",
|
|
"<ol",
|
|
"<header",
|
|
"<footer",
|
|
"<nav",
|
|
# Head
|
|
"<head",
|
|
"<style",
|
|
"<script",
|
|
"<meta",
|
|
"<title",
|
|
"",
|
|
]
|
|
elif language == Language.CSHARP:
|
|
return [
|
|
"\ninterface ",
|
|
"\nenum ",
|
|
"\nimplements ",
|
|
"\ndelegate ",
|
|
"\nevent ",
|
|
# Split along class definitions
|
|
"\nclass ",
|
|
"\nabstract ",
|
|
# Split along method definitions
|
|
"\npublic ",
|
|
"\nprotected ",
|
|
"\nprivate ",
|
|
"\nstatic ",
|
|
"\nreturn ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\ncontinue ",
|
|
"\nfor ",
|
|
"\nforeach ",
|
|
"\nwhile ",
|
|
"\nswitch ",
|
|
"\nbreak ",
|
|
"\ncase ",
|
|
"\nelse ",
|
|
# Split by exceptions
|
|
"\ntry ",
|
|
"\nthrow ",
|
|
"\nfinally ",
|
|
"\ncatch ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.SOL:
|
|
return [
|
|
# Split along compiler information definitions
|
|
"\npragma ",
|
|
"\nusing ",
|
|
# Split along contract definitions
|
|
"\ncontract ",
|
|
"\ninterface ",
|
|
"\nlibrary ",
|
|
# Split along method definitions
|
|
"\nconstructor ",
|
|
"\ntype ",
|
|
"\nfunction ",
|
|
"\nevent ",
|
|
"\nmodifier ",
|
|
"\nerror ",
|
|
"\nstruct ",
|
|
"\nenum ",
|
|
# Split along control flow statements
|
|
"\nif ",
|
|
"\nfor ",
|
|
"\nwhile ",
|
|
"\ndo while ",
|
|
"\nassembly ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.COBOL:
|
|
return [
|
|
# Split along divisions
|
|
"\nIDENTIFICATION DIVISION.",
|
|
"\nENVIRONMENT DIVISION.",
|
|
"\nDATA DIVISION.",
|
|
"\nPROCEDURE DIVISION.",
|
|
# Split along sections within DATA DIVISION
|
|
"\nWORKING-STORAGE SECTION.",
|
|
"\nLINKAGE SECTION.",
|
|
"\nFILE SECTION.",
|
|
# Split along sections within PROCEDURE DIVISION
|
|
"\nINPUT-OUTPUT SECTION.",
|
|
# Split along paragraphs and common statements
|
|
"\nOPEN ",
|
|
"\nCLOSE ",
|
|
"\nREAD ",
|
|
"\nWRITE ",
|
|
"\nIF ",
|
|
"\nELSE ",
|
|
"\nMOVE ",
|
|
"\nPERFORM ",
|
|
"\nUNTIL ",
|
|
"\nVARYING ",
|
|
"\nACCEPT ",
|
|
"\nDISPLAY ",
|
|
"\nSTOP RUN.",
|
|
# Split by the normal type of lines
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
elif language == Language.HASKELL:
|
|
return [
|
|
# Split along function definitions
|
|
"\nmain :: ",
|
|
"\nmain = ",
|
|
"\nlet ",
|
|
"\nin ",
|
|
"\ndo ",
|
|
"\nwhere ",
|
|
"\n:: ",
|
|
"\n= ",
|
|
# Split along type declarations
|
|
"\ndata ",
|
|
"\nnewtype ",
|
|
"\ntype ",
|
|
"\n:: ",
|
|
# Split along module declarations
|
|
"\nmodule ",
|
|
# Split along import statements
|
|
"\nimport ",
|
|
"\nqualified ",
|
|
"\nimport qualified ",
|
|
# Split along typeclass declarations
|
|
"\nclass ",
|
|
"\ninstance ",
|
|
# Split along case expressions
|
|
"\ncase ",
|
|
# Split along guards in function definitions
|
|
"\n| ",
|
|
# Split along record field declarations
|
|
"\ndata ",
|
|
"\n= {",
|
|
"\n, ",
|
|
# Split by the normal type of lines
|
|
"\n\n",
|
|
"\n",
|
|
" ",
|
|
"",
|
|
]
|
|
else:
|
|
raise ValueError(
|
|
f"Language {language} is not supported! "
|
|
f"Please choose from {list(Language)}"
|
|
)
|