mirror of
https://github.com/hwchase17/langchain
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71 lines
2.1 KiB
Python
71 lines
2.1 KiB
Python
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"""Logic for converting internal query language to a valid AstraDB query."""
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from typing import Dict, Tuple, Union
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from langchain_core.structured_query import (
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Comparator,
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Comparison,
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Operation,
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Operator,
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StructuredQuery,
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Visitor,
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)
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MULTIPLE_ARITY_COMPARATORS = [Comparator.IN, Comparator.NIN]
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class AstraDBTranslator(Visitor):
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"""Translate AstraDB internal query language elements to valid filters."""
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"""Subset of allowed logical comparators."""
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allowed_comparators = [
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Comparator.EQ,
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Comparator.NE,
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Comparator.GT,
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Comparator.GTE,
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Comparator.LT,
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Comparator.LTE,
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Comparator.IN,
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Comparator.NIN,
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]
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"""Subset of allowed logical operators."""
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allowed_operators = [Operator.AND, Operator.OR]
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def _format_func(self, func: Union[Operator, Comparator]) -> str:
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self._validate_func(func)
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map_dict = {
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Operator.AND: "$and",
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Operator.OR: "$or",
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Comparator.EQ: "$eq",
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Comparator.NE: "$ne",
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Comparator.GTE: "$gte",
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Comparator.LTE: "$lte",
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Comparator.LT: "$lt",
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Comparator.GT: "$gt",
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Comparator.IN: "$in",
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Comparator.NIN: "$nin",
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}
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return map_dict[func]
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def visit_operation(self, operation: Operation) -> Dict:
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args = [arg.accept(self) for arg in operation.arguments]
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return {self._format_func(operation.operator): args}
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def visit_comparison(self, comparison: Comparison) -> Dict:
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if comparison.comparator in MULTIPLE_ARITY_COMPARATORS and not isinstance(
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comparison.value, list
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):
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comparison.value = [comparison.value]
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comparator = self._format_func(comparison.comparator)
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return {comparison.attribute: {comparator: comparison.value}}
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def visit_structured_query(
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self, structured_query: StructuredQuery
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) -> Tuple[str, dict]:
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if structured_query.filter is None:
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kwargs = {}
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else:
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kwargs = {"filter": structured_query.filter.accept(self)}
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return structured_query.query, kwargs
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