mirror of
https://github.com/hwchase17/langchain
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125 lines
4.0 KiB
Python
125 lines
4.0 KiB
Python
"""Test LLM-generated structured query parsing."""
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from typing import Any, cast
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import lark
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import pytest
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from langchain.chains.query_constructor.ir 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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)
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from langchain.chains.query_constructor.parser import get_parser
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DEFAULT_PARSER = get_parser()
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@pytest.mark.parametrize("x", ("", "foo", 'foo("bar", "baz")'))
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def test_parse_invalid_grammar(x: str) -> None:
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with pytest.raises((ValueError, lark.exceptions.UnexpectedToken)):
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DEFAULT_PARSER.parse(x)
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def test_parse_comparison() -> None:
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comp = 'gte("foo", 2)'
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expected = Comparison(comparator=Comparator.GTE, attribute="foo", value=2)
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for input in (
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comp,
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comp.replace('"', "'"),
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comp.replace(" ", ""),
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comp.replace(" ", " "),
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comp.replace("(", " ("),
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comp.replace(",", ", "),
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comp.replace("2", "2.0"),
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):
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actual = DEFAULT_PARSER.parse(input)
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assert expected == actual
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def test_parse_operation() -> None:
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op = 'and(eq("foo", "bar"), lt("baz", 1995.25))'
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eq = Comparison(comparator=Comparator.EQ, attribute="foo", value="bar")
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lt = Comparison(comparator=Comparator.LT, attribute="baz", value=1995.25)
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expected = Operation(operator=Operator.AND, arguments=[eq, lt])
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for input in (
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op,
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op.replace('"', "'"),
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op.replace(" ", ""),
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op.replace(" ", " "),
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op.replace("(", " ("),
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op.replace(",", ", "),
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op.replace("25", "250"),
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):
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actual = DEFAULT_PARSER.parse(input)
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assert expected == actual
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def test_parse_nested_operation() -> None:
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op = 'and(or(eq("a", "b"), eq("a", "c"), eq("a", "d")), not(eq("z", "foo")))'
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eq1 = Comparison(comparator=Comparator.EQ, attribute="a", value="b")
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eq2 = Comparison(comparator=Comparator.EQ, attribute="a", value="c")
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eq3 = Comparison(comparator=Comparator.EQ, attribute="a", value="d")
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eq4 = Comparison(comparator=Comparator.EQ, attribute="z", value="foo")
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_not = Operation(operator=Operator.NOT, arguments=[eq4])
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_or = Operation(operator=Operator.OR, arguments=[eq1, eq2, eq3])
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expected = Operation(operator=Operator.AND, arguments=[_or, _not])
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actual = DEFAULT_PARSER.parse(op)
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assert expected == actual
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def test_parse_disallowed_comparator() -> None:
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parser = get_parser(allowed_comparators=[Comparator.EQ])
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with pytest.raises(ValueError):
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parser.parse('gt("a", 2)')
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def test_parse_disallowed_operator() -> None:
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parser = get_parser(allowed_operators=[Operator.AND])
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with pytest.raises(ValueError):
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parser.parse('not(gt("a", 2))')
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def _test_parse_value(x: Any) -> None:
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parsed = cast(Comparison, (DEFAULT_PARSER.parse(f'eq("x", {x})')))
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actual = parsed.value
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assert actual == x
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@pytest.mark.parametrize("x", (-1, 0, 1_000_000))
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def test_parse_int_value(x: int) -> None:
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_test_parse_value(x)
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@pytest.mark.parametrize("x", (-1.001, 0.00000002, 1_234_567.6543210))
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def test_parse_float_value(x: float) -> None:
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_test_parse_value(x)
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@pytest.mark.parametrize("x", ([], [1, "b", "true"]))
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def test_parse_list_value(x: list) -> None:
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_test_parse_value(x)
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@pytest.mark.parametrize("x", ('""', '" "', '"foo"', "'foo'"))
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def test_parse_string_value(x: str) -> None:
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parsed = cast(Comparison, DEFAULT_PARSER.parse(f'eq("x", {x})'))
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actual = parsed.value
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assert actual == x[1:-1]
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@pytest.mark.parametrize("x", ("true", "True", "TRUE", "false", "False", "FALSE"))
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def test_parse_bool_value(x: str) -> None:
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parsed = cast(Comparison, DEFAULT_PARSER.parse(f'eq("x", {x})'))
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actual = parsed.value
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expected = x.lower() == "true"
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assert actual == expected
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@pytest.mark.parametrize("op", ("and", "or"))
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@pytest.mark.parametrize("arg", ('eq("foo", 2)', 'and(eq("foo", 2), lte("bar", 1.1))'))
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def test_parser_unpack_single_arg_operation(op: str, arg: str) -> None:
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expected = DEFAULT_PARSER.parse(arg)
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actual = DEFAULT_PARSER.parse(f"{op}({arg})")
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assert expected == actual
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