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+# sql/roles.py
+# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+from __future__ import annotations
+
+from typing import Any
+from typing import Generic
+from typing import Optional
+from typing import TYPE_CHECKING
+from typing import TypeVar
+
+from .. import util
+from ..util.typing import Literal
+
+if TYPE_CHECKING:
+ from ._typing import _PropagateAttrsType
+ from .elements import Label
+ from .selectable import _SelectIterable
+ from .selectable import FromClause
+ from .selectable import Subquery
+
+_T = TypeVar("_T", bound=Any)
+_T_co = TypeVar("_T_co", bound=Any, covariant=True)
+
+
+class SQLRole:
+ """Define a "role" within a SQL statement structure.
+
+ Classes within SQL Core participate within SQLRole hierarchies in order
+ to more accurately indicate where they may be used within SQL statements
+ of all types.
+
+ .. versionadded:: 1.4
+
+ """
+
+ __slots__ = ()
+ allows_lambda = False
+ uses_inspection = False
+
+
+class UsesInspection:
+ __slots__ = ()
+ _post_inspect: Literal[None] = None
+ uses_inspection = True
+
+
+class AllowsLambdaRole:
+ __slots__ = ()
+ allows_lambda = True
+
+
+class HasCacheKeyRole(SQLRole):
+ __slots__ = ()
+ _role_name = "Cacheable Core or ORM object"
+
+
+class ExecutableOptionRole(SQLRole):
+ __slots__ = ()
+ _role_name = "ExecutionOption Core or ORM object"
+
+
+class LiteralValueRole(SQLRole):
+ __slots__ = ()
+ _role_name = "Literal Python value"
+
+
+class ColumnArgumentRole(SQLRole):
+ __slots__ = ()
+ _role_name = "Column expression"
+
+
+class ColumnArgumentOrKeyRole(ColumnArgumentRole):
+ __slots__ = ()
+ _role_name = "Column expression or string key"
+
+
+class StrAsPlainColumnRole(ColumnArgumentRole):
+ __slots__ = ()
+ _role_name = "Column expression or string key"
+
+
+class ColumnListRole(SQLRole):
+ """Elements suitable for forming comma separated lists of expressions."""
+
+ __slots__ = ()
+
+
+class StringRole(SQLRole):
+ """mixin indicating a role that results in strings"""
+
+ __slots__ = ()
+
+
+class TruncatedLabelRole(StringRole, SQLRole):
+ __slots__ = ()
+ _role_name = "String SQL identifier"
+
+
+class ColumnsClauseRole(AllowsLambdaRole, UsesInspection, ColumnListRole):
+ __slots__ = ()
+ _role_name = (
+ "Column expression, FROM clause, or other columns clause element"
+ )
+
+ @property
+ def _select_iterable(self) -> _SelectIterable:
+ raise NotImplementedError()
+
+
+class TypedColumnsClauseRole(Generic[_T_co], SQLRole):
+ """element-typed form of ColumnsClauseRole"""
+
+ __slots__ = ()
+
+
+class LimitOffsetRole(SQLRole):
+ __slots__ = ()
+ _role_name = "LIMIT / OFFSET expression"
+
+
+class ByOfRole(ColumnListRole):
+ __slots__ = ()
+ _role_name = "GROUP BY / OF / etc. expression"
+
+
+class GroupByRole(AllowsLambdaRole, UsesInspection, ByOfRole):
+ __slots__ = ()
+ # note there's a special case right now where you can pass a whole
+ # ORM entity to group_by() and it splits out. we may not want to keep
+ # this around
+
+ _role_name = "GROUP BY expression"
+
+
+class OrderByRole(AllowsLambdaRole, ByOfRole):
+ __slots__ = ()
+ _role_name = "ORDER BY expression"
+
+
+class StructuralRole(SQLRole):
+ __slots__ = ()
+
+
+class StatementOptionRole(StructuralRole):
+ __slots__ = ()
+ _role_name = "statement sub-expression element"
+
+
+class OnClauseRole(AllowsLambdaRole, StructuralRole):
+ __slots__ = ()
+ _role_name = (
+ "ON clause, typically a SQL expression or "
+ "ORM relationship attribute"
+ )
+
+
+class WhereHavingRole(OnClauseRole):
+ __slots__ = ()
+ _role_name = "SQL expression for WHERE/HAVING role"
+
+
+class ExpressionElementRole(TypedColumnsClauseRole[_T_co]):
+ # note when using generics for ExpressionElementRole,
+ # the generic type needs to be in
+ # sqlalchemy.sql.coercions._impl_lookup mapping also.
+ # these are set up for basic types like int, bool, str, float
+ # right now
+
+ __slots__ = ()
+ _role_name = "SQL expression element"
+
+ def label(self, name: Optional[str]) -> Label[_T]:
+ raise NotImplementedError()
+
+
+class ConstExprRole(ExpressionElementRole[_T]):
+ __slots__ = ()
+ _role_name = "Constant True/False/None expression"
+
+
+class LabeledColumnExprRole(ExpressionElementRole[_T]):
+ __slots__ = ()
+
+
+class BinaryElementRole(ExpressionElementRole[_T]):
+ __slots__ = ()
+ _role_name = "SQL expression element or literal value"
+
+
+class InElementRole(SQLRole):
+ __slots__ = ()
+ _role_name = (
+ "IN expression list, SELECT construct, or bound parameter object"
+ )
+
+
+class JoinTargetRole(AllowsLambdaRole, UsesInspection, StructuralRole):
+ __slots__ = ()
+ _role_name = (
+ "Join target, typically a FROM expression, or ORM "
+ "relationship attribute"
+ )
+
+
+class FromClauseRole(ColumnsClauseRole, JoinTargetRole):
+ __slots__ = ()
+ _role_name = "FROM expression, such as a Table or alias() object"
+
+ _is_subquery = False
+
+ named_with_column: bool
+
+
+class StrictFromClauseRole(FromClauseRole):
+ __slots__ = ()
+ # does not allow text() or select() objects
+
+
+class AnonymizedFromClauseRole(StrictFromClauseRole):
+ __slots__ = ()
+
+ if TYPE_CHECKING:
+
+ def _anonymous_fromclause(
+ self, *, name: Optional[str] = None, flat: bool = False
+ ) -> FromClause: ...
+
+
+class ReturnsRowsRole(SQLRole):
+ __slots__ = ()
+ _role_name = (
+ "Row returning expression such as a SELECT, a FROM clause, or an "
+ "INSERT/UPDATE/DELETE with RETURNING"
+ )
+
+
+class StatementRole(SQLRole):
+ __slots__ = ()
+ _role_name = "Executable SQL or text() construct"
+
+ if TYPE_CHECKING:
+
+ @util.memoized_property
+ def _propagate_attrs(self) -> _PropagateAttrsType: ...
+
+ else:
+ _propagate_attrs = util.EMPTY_DICT
+
+
+class SelectStatementRole(StatementRole, ReturnsRowsRole):
+ __slots__ = ()
+ _role_name = "SELECT construct or equivalent text() construct"
+
+ def subquery(self) -> Subquery:
+ raise NotImplementedError(
+ "All SelectStatementRole objects should implement a "
+ ".subquery() method."
+ )
+
+
+class HasCTERole(ReturnsRowsRole):
+ __slots__ = ()
+
+
+class IsCTERole(SQLRole):
+ __slots__ = ()
+ _role_name = "CTE object"
+
+
+class CompoundElementRole(AllowsLambdaRole, SQLRole):
+ """SELECT statements inside a CompoundSelect, e.g. UNION, EXTRACT, etc."""
+
+ __slots__ = ()
+ _role_name = (
+ "SELECT construct for inclusion in a UNION or other set construct"
+ )
+
+
+# TODO: are we using this?
+class DMLRole(StatementRole):
+ __slots__ = ()
+
+
+class DMLTableRole(FromClauseRole):
+ __slots__ = ()
+ _role_name = "subject table for an INSERT, UPDATE or DELETE"
+
+
+class DMLColumnRole(SQLRole):
+ __slots__ = ()
+ _role_name = "SET/VALUES column expression or string key"
+
+
+class DMLSelectRole(SQLRole):
+ """A SELECT statement embedded in DML, typically INSERT from SELECT"""
+
+ __slots__ = ()
+ _role_name = "SELECT statement or equivalent textual object"
+
+
+class DDLRole(StatementRole):
+ __slots__ = ()
+
+
+class DDLExpressionRole(StructuralRole):
+ __slots__ = ()
+ _role_name = "SQL expression element for DDL constraint"
+
+
+class DDLConstraintColumnRole(SQLRole):
+ __slots__ = ()
+ _role_name = "String column name or column expression for DDL constraint"
+
+
+class DDLReferredColumnRole(DDLConstraintColumnRole):
+ __slots__ = ()
+ _role_name = (
+ "String column name or Column object for DDL foreign key constraint"
+ )