mirror of
https://github.com/janeczku/calibre-web
synced 2024-08-19 06:06:21 +00:00
161 lines
4.7 KiB
Python
161 lines
4.7 KiB
Python
# Copyright (C) 2013 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
|
|
|
|
from .base import ischema_names
|
|
from ... import types as sqltypes
|
|
|
|
__all__ = ('INT4RANGE', 'INT8RANGE', 'NUMRANGE')
|
|
|
|
class RangeOperators(object):
|
|
"""
|
|
This mixin provides functionality for the Range Operators
|
|
listed in Table 9-44 of the `postgres documentation`__ for Range
|
|
Functions and Operators. It is used by all the range types
|
|
provided in the ``postgres`` dialect and can likely be used for
|
|
any range types you create yourself.
|
|
|
|
__ http://www.postgresql.org/docs/devel/static/functions-range.html
|
|
|
|
No extra support is provided for the Range Functions listed in
|
|
Table 9-45 of the postgres documentation. For these, the normal
|
|
:func:`~sqlalchemy.sql.expression.func` object should be used.
|
|
|
|
.. versionadded:: 0.8.2 Support for Postgresql RANGE operations.
|
|
|
|
"""
|
|
|
|
class comparator_factory(sqltypes.Concatenable.Comparator):
|
|
"""Define comparison operations for range types."""
|
|
|
|
def __ne__(self, other):
|
|
"Boolean expression. Returns true if two ranges are not equal"
|
|
return self.expr.op('<>')(other)
|
|
|
|
def contains(self, other, **kw):
|
|
"""Boolean expression. Returns true if the right hand operand,
|
|
which can be an element or a range, is contained within the
|
|
column.
|
|
"""
|
|
return self.expr.op('@>')(other)
|
|
|
|
def contained_by(self, other):
|
|
"""Boolean expression. Returns true if the column is contained
|
|
within the right hand operand.
|
|
"""
|
|
return self.expr.op('<@')(other)
|
|
|
|
def overlaps(self, other):
|
|
"""Boolean expression. Returns true if the column overlaps
|
|
(has points in common with) the right hand operand.
|
|
"""
|
|
return self.expr.op('&&')(other)
|
|
|
|
def strictly_left_of(self, other):
|
|
"""Boolean expression. Returns true if the column is strictly
|
|
left of the right hand operand.
|
|
"""
|
|
return self.expr.op('<<')(other)
|
|
|
|
__lshift__ = strictly_left_of
|
|
|
|
def strictly_right_of(self, other):
|
|
"""Boolean expression. Returns true if the column is strictly
|
|
right of the right hand operand.
|
|
"""
|
|
return self.expr.op('>>')(other)
|
|
|
|
__rshift__ = strictly_right_of
|
|
|
|
def not_extend_right_of(self, other):
|
|
"""Boolean expression. Returns true if the range in the column
|
|
does not extend right of the range in the operand.
|
|
"""
|
|
return self.expr.op('&<')(other)
|
|
|
|
def not_extend_left_of(self, other):
|
|
"""Boolean expression. Returns true if the range in the column
|
|
does not extend left of the range in the operand.
|
|
"""
|
|
return self.expr.op('&>')(other)
|
|
|
|
def adjacent_to(self, other):
|
|
"""Boolean expression. Returns true if the range in the column
|
|
is adjacent to the range in the operand.
|
|
"""
|
|
return self.expr.op('-|-')(other)
|
|
|
|
def __add__(self, other):
|
|
"""Range expression. Returns the union of the two ranges.
|
|
Will raise an exception if the resulting range is not
|
|
contigous.
|
|
"""
|
|
return self.expr.op('+')(other)
|
|
|
|
class INT4RANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the Postgresql INT4RANGE type.
|
|
|
|
.. versionadded:: 0.8.2
|
|
|
|
"""
|
|
|
|
__visit_name__ = 'INT4RANGE'
|
|
|
|
ischema_names['int4range'] = INT4RANGE
|
|
|
|
class INT8RANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the Postgresql INT8RANGE type.
|
|
|
|
.. versionadded:: 0.8.2
|
|
|
|
"""
|
|
|
|
__visit_name__ = 'INT8RANGE'
|
|
|
|
ischema_names['int8range'] = INT8RANGE
|
|
|
|
class NUMRANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the Postgresql NUMRANGE type.
|
|
|
|
.. versionadded:: 0.8.2
|
|
|
|
"""
|
|
|
|
__visit_name__ = 'NUMRANGE'
|
|
|
|
ischema_names['numrange'] = NUMRANGE
|
|
|
|
class DATERANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the Postgresql DATERANGE type.
|
|
|
|
.. versionadded:: 0.8.2
|
|
|
|
"""
|
|
|
|
__visit_name__ = 'DATERANGE'
|
|
|
|
ischema_names['daterange'] = DATERANGE
|
|
|
|
class TSRANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the Postgresql TSRANGE type.
|
|
|
|
.. versionadded:: 0.8.2
|
|
|
|
"""
|
|
|
|
__visit_name__ = 'TSRANGE'
|
|
|
|
ischema_names['tsrange'] = TSRANGE
|
|
|
|
class TSTZRANGE(RangeOperators, sqltypes.TypeEngine):
|
|
"""Represent the Postgresql TSTZRANGE type.
|
|
|
|
.. versionadded:: 0.8.2
|
|
|
|
"""
|
|
|
|
__visit_name__ = 'TSTZRANGE'
|
|
|
|
ischema_names['tstzrange'] = TSTZRANGE
|