353 lines
11 KiB
Python
353 lines
11 KiB
Python
|
# sql/default_comparator.py
|
||
|
|
# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
|
||
|
|
# <see AUTHORS file>
|
||
|
|
#
|
||
|
|
# This module is part of SQLAlchemy and is released under
|
||
|
|
# the MIT License: http://www.opensource.org/licenses/mit-license.php
|
||
|
|
|
||
|
|
"""Default implementation of SQL comparison operations.
|
||
|
|
"""
|
||
|
|
|
||
|
|
|
||
|
|
from . import coercions
|
||
|
|
from . import operators
|
||
|
|
from . import roles
|
||
|
|
from . import type_api
|
||
|
|
from .elements import and_
|
||
|
|
from .elements import BinaryExpression
|
||
|
|
from .elements import ClauseList
|
||
|
|
from .elements import collate
|
||
|
|
from .elements import CollectionAggregate
|
||
|
|
from .elements import False_
|
||
|
|
from .elements import Null
|
||
|
|
from .elements import or_
|
||
|
|
from .elements import True_
|
||
|
|
from .elements import UnaryExpression
|
||
|
|
from .. import exc
|
||
|
|
from .. import util
|
||
|
|
|
||
|
|
|
||
|
|
def _boolean_compare(
|
||
|
|
expr,
|
||
|
|
op,
|
||
|
|
obj,
|
||
|
|
negate=None,
|
||
|
|
reverse=False,
|
||
|
|
_python_is_types=(util.NoneType, bool),
|
||
|
|
result_type=None,
|
||
|
|
**kwargs
|
||
|
|
):
|
||
|
|
|
||
|
|
if result_type is None:
|
||
|
|
result_type = type_api.BOOLEANTYPE
|
||
|
|
|
||
|
|
if isinstance(obj, _python_is_types + (Null, True_, False_)):
|
||
|
|
|
||
|
|
# allow x ==/!= True/False to be treated as a literal.
|
||
|
|
# this comes out to "== / != true/false" or "1/0" if those
|
||
|
|
# constants aren't supported and works on all platforms
|
||
|
|
if op in (operators.eq, operators.ne) and isinstance(
|
||
|
|
obj, (bool, True_, False_)
|
||
|
|
):
|
||
|
|
return BinaryExpression(
|
||
|
|
expr,
|
||
|
|
coercions.expect(roles.ConstExprRole, obj),
|
||
|
|
op,
|
||
|
|
type_=result_type,
|
||
|
|
negate=negate,
|
||
|
|
modifiers=kwargs,
|
||
|
|
)
|
||
|
|
elif op in (
|
||
|
|
operators.is_distinct_from,
|
||
|
|
operators.is_not_distinct_from,
|
||
|
|
):
|
||
|
|
return BinaryExpression(
|
||
|
|
expr,
|
||
|
|
coercions.expect(roles.ConstExprRole, obj),
|
||
|
|
op,
|
||
|
|
type_=result_type,
|
||
|
|
negate=negate,
|
||
|
|
modifiers=kwargs,
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
# all other None/True/False uses IS, IS NOT
|
||
|
|
if op in (operators.eq, operators.is_):
|
||
|
|
return BinaryExpression(
|
||
|
|
expr,
|
||
|
|
coercions.expect(roles.ConstExprRole, obj),
|
||
|
|
operators.is_,
|
||
|
|
negate=operators.is_not,
|
||
|
|
type_=result_type,
|
||
|
|
)
|
||
|
|
elif op in (operators.ne, operators.is_not):
|
||
|
|
return BinaryExpression(
|
||
|
|
expr,
|
||
|
|
coercions.expect(roles.ConstExprRole, obj),
|
||
|
|
operators.is_not,
|
||
|
|
negate=operators.is_,
|
||
|
|
type_=result_type,
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
raise exc.ArgumentError(
|
||
|
|
"Only '=', '!=', 'is_()', 'is_not()', "
|
||
|
|
"'is_distinct_from()', 'is_not_distinct_from()' "
|
||
|
|
"operators can be used with None/True/False"
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
obj = coercions.expect(
|
||
|
|
roles.BinaryElementRole, element=obj, operator=op, expr=expr
|
||
|
|
)
|
||
|
|
|
||
|
|
if reverse:
|
||
|
|
return BinaryExpression(
|
||
|
|
obj, expr, op, type_=result_type, negate=negate, modifiers=kwargs
|
||
|
|
)
|
||
|
|
else:
|
||
|
|
return BinaryExpression(
|
||
|
|
expr, obj, op, type_=result_type, negate=negate, modifiers=kwargs
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _custom_op_operate(expr, op, obj, reverse=False, result_type=None, **kw):
|
||
|
|
if result_type is None:
|
||
|
|
if op.return_type:
|
||
|
|
result_type = op.return_type
|
||
|
|
elif op.is_comparison:
|
||
|
|
result_type = type_api.BOOLEANTYPE
|
||
|
|
|
||
|
|
return _binary_operate(
|
||
|
|
expr, op, obj, reverse=reverse, result_type=result_type, **kw
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _binary_operate(expr, op, obj, reverse=False, result_type=None, **kw):
|
||
|
|
obj = coercions.expect(
|
||
|
|
roles.BinaryElementRole, obj, expr=expr, operator=op
|
||
|
|
)
|
||
|
|
|
||
|
|
if reverse:
|
||
|
|
left, right = obj, expr
|
||
|
|
else:
|
||
|
|
left, right = expr, obj
|
||
|
|
|
||
|
|
if result_type is None:
|
||
|
|
op, result_type = left.comparator._adapt_expression(
|
||
|
|
op, right.comparator
|
||
|
|
)
|
||
|
|
|
||
|
|
return BinaryExpression(left, right, op, type_=result_type, modifiers=kw)
|
||
|
|
|
||
|
|
|
||
|
|
def _conjunction_operate(expr, op, other, **kw):
|
||
|
|
if op is operators.and_:
|
||
|
|
return and_(expr, other)
|
||
|
|
elif op is operators.or_:
|
||
|
|
return or_(expr, other)
|
||
|
|
else:
|
||
|
|
raise NotImplementedError()
|
||
|
|
|
||
|
|
|
||
|
|
def _scalar(expr, op, fn, **kw):
|
||
|
|
return fn(expr)
|
||
|
|
|
||
|
|
|
||
|
|
def _in_impl(expr, op, seq_or_selectable, negate_op, **kw):
|
||
|
|
seq_or_selectable = coercions.expect(
|
||
|
|
roles.InElementRole, seq_or_selectable, expr=expr, operator=op
|
||
|
|
)
|
||
|
|
if "in_ops" in seq_or_selectable._annotations:
|
||
|
|
op, negate_op = seq_or_selectable._annotations["in_ops"]
|
||
|
|
|
||
|
|
return _boolean_compare(
|
||
|
|
expr, op, seq_or_selectable, negate=negate_op, **kw
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _getitem_impl(expr, op, other, **kw):
|
||
|
|
if isinstance(expr.type, type_api.INDEXABLE):
|
||
|
|
other = coercions.expect(
|
||
|
|
roles.BinaryElementRole, other, expr=expr, operator=op
|
||
|
|
)
|
||
|
|
return _binary_operate(expr, op, other, **kw)
|
||
|
|
else:
|
||
|
|
_unsupported_impl(expr, op, other, **kw)
|
||
|
|
|
||
|
|
|
||
|
|
def _unsupported_impl(expr, op, *arg, **kw):
|
||
|
|
raise NotImplementedError(
|
||
|
|
"Operator '%s' is not supported on " "this expression" % op.__name__
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _inv_impl(expr, op, **kw):
|
||
|
|
"""See :meth:`.ColumnOperators.__inv__`."""
|
||
|
|
|
||
|
|
# undocumented element currently used by the ORM for
|
||
|
|
# relationship.contains()
|
||
|
|
if hasattr(expr, "negation_clause"):
|
||
|
|
return expr.negation_clause
|
||
|
|
else:
|
||
|
|
return expr._negate()
|
||
|
|
|
||
|
|
|
||
|
|
def _neg_impl(expr, op, **kw):
|
||
|
|
"""See :meth:`.ColumnOperators.__neg__`."""
|
||
|
|
return UnaryExpression(expr, operator=operators.neg, type_=expr.type)
|
||
|
|
|
||
|
|
|
||
|
|
def _match_impl(expr, op, other, **kw):
|
||
|
|
"""See :meth:`.ColumnOperators.match`."""
|
||
|
|
|
||
|
|
return _boolean_compare(
|
||
|
|
expr,
|
||
|
|
operators.match_op,
|
||
|
|
coercions.expect(
|
||
|
|
roles.BinaryElementRole,
|
||
|
|
other,
|
||
|
|
expr=expr,
|
||
|
|
operator=operators.match_op,
|
||
|
|
),
|
||
|
|
result_type=type_api.MATCHTYPE,
|
||
|
|
negate=operators.not_match_op
|
||
|
|
if op is operators.match_op
|
||
|
|
else operators.match_op,
|
||
|
|
**kw
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _distinct_impl(expr, op, **kw):
|
||
|
|
"""See :meth:`.ColumnOperators.distinct`."""
|
||
|
|
return UnaryExpression(
|
||
|
|
expr, operator=operators.distinct_op, type_=expr.type
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _between_impl(expr, op, cleft, cright, **kw):
|
||
|
|
"""See :meth:`.ColumnOperators.between`."""
|
||
|
|
return BinaryExpression(
|
||
|
|
expr,
|
||
|
|
ClauseList(
|
||
|
|
coercions.expect(
|
||
|
|
roles.BinaryElementRole,
|
||
|
|
cleft,
|
||
|
|
expr=expr,
|
||
|
|
operator=operators.and_,
|
||
|
|
),
|
||
|
|
coercions.expect(
|
||
|
|
roles.BinaryElementRole,
|
||
|
|
cright,
|
||
|
|
expr=expr,
|
||
|
|
operator=operators.and_,
|
||
|
|
),
|
||
|
|
operator=operators.and_,
|
||
|
|
group=False,
|
||
|
|
group_contents=False,
|
||
|
|
),
|
||
|
|
op,
|
||
|
|
negate=operators.not_between_op
|
||
|
|
if op is operators.between_op
|
||
|
|
else operators.between_op,
|
||
|
|
modifiers=kw,
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _collate_impl(expr, op, other, **kw):
|
||
|
|
return collate(expr, other)
|
||
|
|
|
||
|
|
|
||
|
|
def _regexp_match_impl(expr, op, pattern, flags, **kw):
|
||
|
|
if flags is not None:
|
||
|
|
flags = coercions.expect(
|
||
|
|
roles.BinaryElementRole,
|
||
|
|
flags,
|
||
|
|
expr=expr,
|
||
|
|
operator=operators.regexp_replace_op,
|
||
|
|
)
|
||
|
|
return _boolean_compare(
|
||
|
|
expr,
|
||
|
|
op,
|
||
|
|
pattern,
|
||
|
|
flags=flags,
|
||
|
|
negate=operators.not_regexp_match_op
|
||
|
|
if op is operators.regexp_match_op
|
||
|
|
else operators.regexp_match_op,
|
||
|
|
**kw
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _regexp_replace_impl(expr, op, pattern, replacement, flags, **kw):
|
||
|
|
replacement = coercions.expect(
|
||
|
|
roles.BinaryElementRole,
|
||
|
|
replacement,
|
||
|
|
expr=expr,
|
||
|
|
operator=operators.regexp_replace_op,
|
||
|
|
)
|
||
|
|
if flags is not None:
|
||
|
|
flags = coercions.expect(
|
||
|
|
roles.BinaryElementRole,
|
||
|
|
flags,
|
||
|
|
expr=expr,
|
||
|
|
operator=operators.regexp_replace_op,
|
||
|
|
)
|
||
|
|
return _binary_operate(
|
||
|
|
expr, op, pattern, replacement=replacement, flags=flags, **kw
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
# a mapping of operators with the method they use, along with
|
||
|
|
# their negated operator for comparison operators
|
||
|
|
operator_lookup = {
|
||
|
|
"and_": (_conjunction_operate,),
|
||
|
|
"or_": (_conjunction_operate,),
|
||
|
|
"inv": (_inv_impl,),
|
||
|
|
"add": (_binary_operate,),
|
||
|
|
"mul": (_binary_operate,),
|
||
|
|
"sub": (_binary_operate,),
|
||
|
|
"div": (_binary_operate,),
|
||
|
|
"mod": (_binary_operate,),
|
||
|
|
"truediv": (_binary_operate,),
|
||
|
|
"custom_op": (_custom_op_operate,),
|
||
|
|
"json_path_getitem_op": (_binary_operate,),
|
||
|
|
"json_getitem_op": (_binary_operate,),
|
||
|
|
"concat_op": (_binary_operate,),
|
||
|
|
"any_op": (_scalar, CollectionAggregate._create_any),
|
||
|
|
"all_op": (_scalar, CollectionAggregate._create_all),
|
||
|
|
"lt": (_boolean_compare, operators.ge),
|
||
|
|
"le": (_boolean_compare, operators.gt),
|
||
|
|
"ne": (_boolean_compare, operators.eq),
|
||
|
|
"gt": (_boolean_compare, operators.le),
|
||
|
|
"ge": (_boolean_compare, operators.lt),
|
||
|
|
"eq": (_boolean_compare, operators.ne),
|
||
|
|
"is_distinct_from": (_boolean_compare, operators.is_not_distinct_from),
|
||
|
|
"is_not_distinct_from": (_boolean_compare, operators.is_distinct_from),
|
||
|
|
"like_op": (_boolean_compare, operators.not_like_op),
|
||
|
|
"ilike_op": (_boolean_compare, operators.not_ilike_op),
|
||
|
|
"not_like_op": (_boolean_compare, operators.like_op),
|
||
|
|
"not_ilike_op": (_boolean_compare, operators.ilike_op),
|
||
|
|
"contains_op": (_boolean_compare, operators.not_contains_op),
|
||
|
|
"startswith_op": (_boolean_compare, operators.not_startswith_op),
|
||
|
|
"endswith_op": (_boolean_compare, operators.not_endswith_op),
|
||
|
|
"desc_op": (_scalar, UnaryExpression._create_desc),
|
||
|
|
"asc_op": (_scalar, UnaryExpression._create_asc),
|
||
|
|
"nulls_first_op": (_scalar, UnaryExpression._create_nulls_first),
|
||
|
|
"nulls_last_op": (_scalar, UnaryExpression._create_nulls_last),
|
||
|
|
"in_op": (_in_impl, operators.not_in_op),
|
||
|
|
"not_in_op": (_in_impl, operators.in_op),
|
||
|
|
"is_": (_boolean_compare, operators.is_),
|
||
|
|
"is_not": (_boolean_compare, operators.is_not),
|
||
|
|
"collate": (_collate_impl,),
|
||
|
|
"match_op": (_match_impl,),
|
||
|
|
"not_match_op": (_match_impl,),
|
||
|
|
"distinct_op": (_distinct_impl,),
|
||
|
|
"between_op": (_between_impl,),
|
||
|
|
"not_between_op": (_between_impl,),
|
||
|
|
"neg": (_neg_impl,),
|
||
|
|
"getitem": (_getitem_impl,),
|
||
|
|
"lshift": (_unsupported_impl,),
|
||
|
|
"rshift": (_unsupported_impl,),
|
||
|
|
"contains": (_unsupported_impl,),
|
||
|
|
"regexp_match_op": (_regexp_match_impl,),
|
||
|
|
"not_regexp_match_op": (_regexp_match_impl,),
|
||
|
|
"regexp_replace_op": (_regexp_replace_impl,),
|
||
|
|
}
|