mirror of
https://github.com/hwchase17/langchain.git
synced 2026-02-21 06:33:41 +00:00
3b609642ae
Alternate implementation of #3452 that relies on a generic query constructor chain and language and then has vector store-specific translation layer. Still refactoring and updating examples but general structure is there and seems to work s well as #3452 on exampels --------- Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
84 lines
1.9 KiB
Python
84 lines
1.9 KiB
Python
"""Internal representation of a structured query language."""
|
|
from __future__ import annotations
|
|
|
|
from abc import ABC, abstractmethod
|
|
from enum import Enum
|
|
from typing import Any, List, Optional, Sequence
|
|
|
|
from pydantic import BaseModel
|
|
|
|
|
|
class Visitor(ABC):
|
|
"""Defines interface for IR translation using visitor pattern."""
|
|
|
|
allowed_comparators: Optional[Sequence[Comparator]] = None
|
|
allowed_operators: Optional[Sequence[Operator]] = None
|
|
|
|
@abstractmethod
|
|
def visit_operation(self, operation: Operation) -> Any:
|
|
"""Translate an Operation."""
|
|
|
|
@abstractmethod
|
|
def visit_comparison(self, comparison: Comparison) -> Any:
|
|
"""Translate a Comparison."""
|
|
|
|
@abstractmethod
|
|
def visit_structured_query(self, structured_query: StructuredQuery) -> Any:
|
|
"""Translate a StructuredQuery."""
|
|
|
|
|
|
def _to_snake_case(name: str) -> str:
|
|
"""Convert a name into snake_case."""
|
|
snake_case = ""
|
|
for i, char in enumerate(name):
|
|
if char.isupper() and i != 0:
|
|
snake_case += "_" + char.lower()
|
|
else:
|
|
snake_case += char.lower()
|
|
return snake_case
|
|
|
|
|
|
class Expr(BaseModel):
|
|
def accept(self, visitor: Visitor) -> Any:
|
|
return getattr(visitor, f"visit_{_to_snake_case(self.__class__.__name__)}")(
|
|
self
|
|
)
|
|
|
|
|
|
class Operator(str, Enum):
|
|
AND = "and"
|
|
OR = "or"
|
|
NOT = "not"
|
|
|
|
|
|
class Comparator(str, Enum):
|
|
EQ = "eq"
|
|
GT = "gt"
|
|
GTE = "gte"
|
|
LT = "lt"
|
|
LTE = "lte"
|
|
|
|
|
|
class FilterDirective(Expr, ABC):
|
|
"""A filtering expression."""
|
|
|
|
|
|
class Comparison(FilterDirective):
|
|
"""A comparison to a value."""
|
|
|
|
comparator: Comparator
|
|
attribute: str
|
|
value: Any
|
|
|
|
|
|
class Operation(FilterDirective):
|
|
"""A logical operation over other directives."""
|
|
|
|
operator: Operator
|
|
arguments: List[FilterDirective]
|
|
|
|
|
|
class StructuredQuery(Expr):
|
|
query: str
|
|
filter: Optional[FilterDirective]
|