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from __future__ import annotations
from typing import Any
from typing import Type
from typing import TYPE_CHECKING
from typing import TypeVar
from typing import Union
from . import roles
from .. import util
from ..inspection import Inspectable
if TYPE_CHECKING:
from .elements import quoted_name
from .schema import DefaultGenerator
from .schema import Sequence
from .selectable import FromClause
from .selectable import NamedFromClause
from .selectable import TableClause
from .sqltypes import TupleType
from .type_api import TypeEngine
from ..util.typing import TypeGuard
_T = TypeVar("_T", bound=Any)
_ColumnsClauseElement = Union[
roles.ColumnsClauseRole,
Type,
Inspectable[roles.HasColumnElementClauseElement],
]
_FromClauseElement = Union[
roles.FromClauseRole, Type, Inspectable[roles.HasFromClauseElement]
]
_ColumnExpression = Union[
roles.ExpressionElementRole[_T],
Inspectable[roles.HasColumnElementClauseElement],
]
_PropagateAttrsType = util.immutabledict[str, Any]
_TypeEngineArgument = Union[Type["TypeEngine[_T]"], "TypeEngine[_T]"]
def is_named_from_clause(t: FromClause) -> TypeGuard[NamedFromClause]:
return t.named_with_column
def has_schema_attr(t: FromClause) -> TypeGuard[TableClause]:
return hasattr(t, "schema")
def is_quoted_name(s: str) -> TypeGuard[quoted_name]:
return hasattr(s, "quote")
def is_tuple_type(t: TypeEngine[Any]) -> TypeGuard[TupleType]:
return t._is_tuple_type
def is_has_clause_element(s: object) -> TypeGuard[roles.HasClauseElement]:
return hasattr(s, "__clause_element__")
def is_has_column_element_clause_element(
s: object,
) -> TypeGuard[roles.HasColumnElementClauseElement]:
return hasattr(s, "__clause_element__")
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