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e#6d_e$6dSe[6e\e\6e]e]6Z^d`�Z_daS(bs*Defines operators used in SQL expressions.i����(
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Base of comparison and logical operators.

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    :meth:`~sqlalchemy.sql.operators.Operators.__and__`,
    :meth:`~sqlalchemy.sql.operators.Operators.__or__`,
    :meth:`~sqlalchemy.sql.operators.Operators.__invert__`.

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    cCs|jt
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        When used with SQL expressions, results in an
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            a & b

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            from sqlalchemy import and_
            and_(a, b)

        Care should be taken when using ``&`` regarding
        operator precedence; the ``&`` operator has the highest precedence.
        The operands should be enclosed in parenthesis if they contain
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            (a == 2) & (b == 4)

        (toperateR
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            from sqlalchemy import or_
            or_(a, b)

        Care should be taken when using ``|`` regarding
        operator precedence; the ``|`` operator has the highest precedence.
        The operands should be enclosed in parenthesis if they contain
        further sub expressions::

            (a == 2) | (b == 4)

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Implement the ``~`` operator.

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            ~a

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            from sqlalchemy import not_
            not_(a)

        (RR(
R((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyt
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|||����
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�}|S(s!produce a generic operator function.

        e.g.::

          somecolumn.op("*")(5)

        produces::

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        This function can also be used to make bitwise operators explicit. For
        example::

          somecolumn.op('&')(0xff)

        is a bitwise AND of the value in ``somecolumn``.

        :param operator: a string which will be output as the infix operator
          between this element and the expression passed to the
          generated function.

        :param precedence: precedence to apply to the operator, when
         parenthesizing expressions.  A lower number will cause the expression
         to be parenthesized when applied against another operator with
         higher precedence.  The default value of ``0`` is lower than all
         operators except for the comma (``,``) and ``AS`` operators.
         A value of 100 will be higher or equal to all operators, and -100
         will be lower than or equal to all operators.

        :param is_comparison: if True, the operator will be considered as a
         "comparison" operator, that is which evaluates to a boolean
         true/false value, like ``==``, ``>``, etc.  This flag should be set
         so that ORM relationships can establish that the operator is a
         comparison operator when used in a custom join condition.

         .. versionadded:: 0.9.2 - added the
            :paramref:`.Operators.op.is_comparison` flag.

        :param return_type: a :class:`.TypeEngine` class or object that will
          force the return type of an expression produced by this operator
          to be of that type.   By default, operators that specify
          :paramref:`.Operators.op.is_comparison` will resolve to
          :class:`.Boolean`, and those that do not will be of the same
          type as the left-hand operand.

          .. versionadded:: 1.2.0b3 - added the
             :paramref:`.Operators.op.return_type` argument.

        .. seealso::

            :ref:`types_operators`

            :ref:`relationship_custom_operator`

        c

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Return a custom boolean operator.

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        :meth:`.Operators.op` and passing the
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        flag with True.

        .. versionadded:: 1.2.0b3

        .. seealso::

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        R R!(R#tTrue(RRR ((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytbool_op�scOstt
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        For example, overriding :class:`.ColumnOperators`
        to apply ``func.lower()`` to the left and right
        side::

            class MyComparator(ColumnOperators):
                def operate(self, op, other):
                    return op(func.lower(self), func.lower(other))

        :param op:  Operator callable.
        :param \*other: the 'other' side of the operation. Will
         be a single scalar for most operations.
        :param \**kwargs: modifiers.  These may be passed by special
         operators such as :meth:`ColumnOperators.contains`.


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    used directly when programmatically constructing expressions.   E.g.
    to represent the "factorial" operation::

        from sqlalchemy.sql import UnaryExpression
        from sqlalchemy.sql import operators
        from sqlalchemy import Numeric

        unary = UnaryExpression(table.c.somecolumn,
                modifier=operators.custom_op("!"),
                type_=Numeric)


    .. seealso::

        :meth:`.Operators.op`

        :meth:`.Operators.bool_op`

    RicCsO|
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		tColumnOperatorscBs�
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Defines boolean, comparison, and other operators for
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    :meth:`.operate` or :meth:`.reverse_operate`,
    passing in the appropriate operator function from the
    Python builtin ``operator`` module or
    a SQLAlchemy-specific operator function from
    :mod:`sqlalchemy.expression.operators`.   For example
    the ``__eq__`` function::

        def __eq__(self, other):
            return self.operate(operators.eq, other)

    Where ``operators.eq`` is essentially::

        def eq(a, b):
            return a == b

    The core column expression unit :class:`.ColumnElement`
    overrides :meth:`.Operators.operate` and others
    to return further :class:`.ColumnElement` constructs,
    so that the ``==`` operation above is replaced by a clause
    construct.

    .. seealso::

        :ref:`types_operators`

        :attr:`.TypeEngine.comparator_factory`

        :class:`.ColumnOperators`

        :class:`.PropComparator`

    cCs|jt
|
�S(
sdImplement the ``<`` operator.

        In a column context, produces the clause ``a < b``.

        (RR
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scCs|jt
|
�S(
sfImplement the ``<=`` operator.

        In a column context, produces the clause ``a <= b``.

        (RR(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyt__le__\
scCs|jt
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�S(
s�Implement the ``==`` operator.

        In a column context, produces the clause ``a = b``.
        If the target is ``None``, produces ``a IS NULL``.

        (RR(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyR5f
scCs|jt
|
�S(
s�Implement the ``!=`` operator.

        In a column context, produces the clause ``a != b``.
        If the target is ``None``, produces ``a IS NOT NULL``.

        (RR
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scCs|jt
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�S(
s�Implement the ``IS DISTINCT FROM`` operator.

        Renders "a IS DISTINCT FROM b" on most platforms;
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        (Rtis_distinct_from(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyR@x
s	cCs|jt
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�S(
s�Implement the ``IS NOT DISTINCT FROM`` operator.

        Renders "a IS NOT DISTINCT FROM b" on most platforms;
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        (Rtisnot_distinct_from(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyRA�
s	cCs|jt
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�S(
sdImplement the ``>`` operator.

        In a column context, produces the clause ``a > b``.

        (RR(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyt__gt__�
scCs|jt
|
�S(
sfImplement the ``>=`` operator.

        In a column context, produces the clause ``a >= b``.

        (RR(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyt__ge__�
sc

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saImplement the ``-`` operator.

        In a column context, produces the clause ``-a``.

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scCs|jt
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�S(
N(RR(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyt__contains__�
s
cCs|jt
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�S(
s�Implement the [] operator.

        This can be used by some database-specific types
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scCs|jt
|
�S(
s�implement the << operator.

        Not used by SQLAlchemy core, this is provided
        for custom operator systems which want to use
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scCs|jt
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�S(
s�implement the >> operator.

        Not used by SQLAlchemy core, this is provided
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scCs|jt
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�S(
s�Implement the 'concat' operator.

        In a column context, produces the clause ``a || b``,
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scCs|jt
|
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Implement the ``like`` operator.

        In a column context, produces the expression::

            a LIKE other

        E.g.::

            stmt = select([sometable]).\
                where(sometable.c.column.like("%foobar%"))

        :param other: expression to be compared
        :param escape: optional escape character, renders the ``ESCAPE``
          keyword, e.g.::

            somecolumn.like("foo/%bar", escape="/")

        .. seealso::

            :meth:`.ColumnOperators.ilike`

        tescape(Rtlike_op(RRRL((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytlike�
scCs|jt
|
d
|�
S(s�Implement the ``ilike`` operator, e.g. case insensitive LIKE.

        In a column context, produces an expression either of the form::

            lower(a) LIKE lower(other)

        Or on backends that support the ILIKE operator::

            a ILIKE other

        E.g.::

            stmt = select([sometable]).\
                where(sometable.c.column.ilike("%foobar%"))

        :param other: expression to be compared
        :param escape: optional escape character, renders the ``ESCAPE``
          keyword, e.g.::

            somecolumn.ilike("foo/%bar", escape="/")

        .. seealso::

            :meth:`.ColumnOperators.like`

        RL(Rtilike_op(RRRL((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytilike�
scCs|jt
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Implement the ``in`` operator.

        In a column context, produces the clause ``column IN <other>``.

        The given parameter ``other`` may be:

        * A list of literal values, e.g.::

            stmt.where(column.in_([1, 2, 3]))

          In this calling form, the list of items is converted to a set of
          bound parameters the same length as the list given::

            WHERE COL IN (?, ?, ?)

        * An empty list, e.g.::

            stmt.where(column.in_([]))

          In this calling form, the expression renders a "false" expression,
          e.g.::

            WHERE 1 != 1

          This "false" expression has historically had different behaviors
          in older SQLAlchemy versions, see
          :paramref:`.create_engine.empty_in_strategy` for behavioral options.

          .. versionchanged:: 1.2 simplified the behavior of "empty in"
             expressions

        * A bound parameter, e.g. :func:`.bindparam`, may be used if it
          includes the :paramref:`.bindparam.expanding` flag::

            stmt.where(column.in_(bindparam('value', expanding=True)))

          In this calling form, the expression renders a special non-SQL
          placeholder expression that looks like::

            WHERE COL IN ([EXPANDING_value])

          This placeholder expression is intercepted at statement execution
          time to be converted into the variable number of bound parameter
          form illustrated earlier.   If the statement were executed as::

            connection.execute(stmt, {"value": [1, 2, 3]})

          The database would be passed a bound parameter for each value::

            WHERE COL IN (?, ?, ?)

          .. versionadded:: 1.2 added "expanding" bound parameters

          If an empty list is passed, a special "empty list" expression,
          which is specific to the database in use, is rendered.  On
          SQLite this would be::

            WHERE COL IN (SELECT 1 FROM (SELECT 1) WHERE 1!=1)

          .. versionadded:: 1.3 "expanding" bound parameters now support
             empty lists

        * a :func:`.select` construct, which is usually a correlated
          scalar select::

            stmt.where(
                column.in_(
                    select([othertable.c.y]).
                    where(table.c.x == othertable.c.x)
                )
            )

          In this calling form, :meth:`.ColumnOperators.in_` renders as given::

            WHERE COL IN (SELECT othertable.y
            FROM othertable WHERE othertable.x = table.x)

        :param other: a list of literals, a :func:`.select` construct,
         or a :func:`.bindparam` construct that includes the
         :paramref:`.bindparam.expanding` flag set to True.

        (Rtin_op(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytin_sScCs|jt
|
�S(
s�implement the ``NOT IN`` operator.

        This is equivalent to using negation with
        :meth:`.ColumnOperators.in_`, i.e. ``~x.in_(y)``.

        In the case that ``other`` is an empty sequence, the compiler
        produces an "empty not in" expression.   This defaults to the
        expression "1 = 1" to produce true in all cases.  The
        :paramref:`.create_engine.empty_in_strategy` may be used to
        alter this behavior.

        .. versionchanged:: 1.2  The :meth:`.ColumnOperators.in_` and
           :meth:`.ColumnOperators.notin_` operators
           now produce a "static" expression for an empty IN sequence
           by default.

        .. seealso::

            :meth:`.ColumnOperators.in_`

        (Rtnotin_op(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytnotin_XscCs|jt
|
d
|�
S(s�implement the ``NOT LIKE`` operator.

        This is equivalent to using negation with
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        .. seealso::

            :meth:`.ColumnOperators.like`

        RL(Rt
notlike_op(RRRL((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytnotlikepscCs|jt
|
d
|�
S(s�implement the ``NOT ILIKE`` operator.

        This is equivalent to using negation with
        :meth:`.ColumnOperators.ilike`, i.e. ``~x.ilike(y)``.

        .. seealso::

            :meth:`.ColumnOperators.ilike`

        RL(Rtnotilike_op(RRRL((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pytnotilike}scCs|jt
|
�S(
sV
Implement the ``IS`` operator.

        Normally, ``IS`` is generated automatically when comparing to a
        value of ``None``, which resolves to ``NULL``.  However, explicit
        usage of ``IS`` may be desirable if comparing to boolean values
        on certain platforms.

        .. seealso:: :meth:`.ColumnOperators.isnot`

        (Rtis_(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyRY�scCs|jt
|
�S(
s`
Implement the ``IS NOT`` operator.

        Normally, ``IS NOT`` is generated automatically when comparing to a
        value of ``None``, which resolves to ``NULL``.  However, explicit
        usage of ``IS NOT`` may be desirable if comparing to boolean values
        on certain platforms.

        .. seealso:: :meth:`.ColumnOperators.is_`

        (Rtisnot(RR((sK/opt/alt/python27/lib64/python2.7/site-packages/sqlalchemy/sql/operators.pyRZ�scKs|jt
|
|�S(
s�Implement the ``startswith`` operator.

        Produces a LIKE expression that tests against a match for the start
        of a string value::

            column LIKE <other> || '%'

        E.g.::

            stmt = select([sometable]).\
                where(sometable.c.column.startswith("foobar"))

        Since the operator uses ``LIKE``, wildcard characters
        ``"%"`` and ``"_"`` that are present inside the <other> expression
        will behave like wildcards as well.   For literal string
        values, the :paramref:`.ColumnOperators.startswith.autoescape` flag
        may be set to ``True`` to apply escaping to occurrences of these
        characters within the string value so that they match as themselves
        and not as wildcard characters.  Alternatively, the
        :paramref:`.ColumnOperators.startswith.escape` parameter will establish
        a given character as an escape character which can be of use when
        the target expression is not a literal string.

        :param other: expression to be compared.   This is usually a plain
          string value, but can also be an arbitrary SQL expression.  LIKE
          wildcard characters ``%`` and ``_`` are not escaped by default unless
          the :paramref:`.ColumnOperators.startswith.autoescape` flag is
          set to True.

        :param autoescape: boolean; when True, establishes an escape character
          within the LIKE expression, then applies it to all occurrences of
          ``"%"``, ``"_"`` and the escape character itself within the
          comparison value, which is assumed to be a literal string and not a
          SQL expression.

          An expression such as::

            somecolumn.startswith("foo%bar", autoescape=True)

          Will render as::

            somecolumn LIKE :param || '%' ESCAPE '/'

          With the value of :param as ``"foo/%bar"``.

          .. versionadded:: 1.2

          .. versionchanged:: 1.2.0 The
            :paramref:`.ColumnOperators.startswith.autoescape` parameter is
             now a simple boolean rather than a character; the escape
             character itself is also escaped, and defaults to a forwards
             slash, which itself can be customized using the
             :paramref:`.ColumnOperators.startswith.escape` parameter.

        :param escape: a character which when given will render with the
          ``ESCAPE`` keyword to establish that character as the escape
          character.  This character can then be placed preceding occurrences
          of ``%`` and ``_`` to allow them to act as themselves and not
          wildcard characters.

          An expression such as::

            somecolumn.startswith("foo/%bar", escape="^")

          Will render as::

            somecolumn LIKE :param || '%' ESCAPE '^'

          The parameter may also be combined with
          :paramref:`.ColumnOperators.startswith.autoescape`::

            somecolumn.startswith("foo%bar^bat", escape="^", autoescape=True)

          Where above, the given literal parameter will be converted to
          ``"foo^%bar^^bat"`` before being passed to the database.

        .. seealso::

            :meth:`.ColumnOperators.endswith`

            :meth:`.ColumnOperators.contains`

            :meth:`.ColumnOperators.like`

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          An expression such as::

            somecolumn.endswith("foo%bar", autoescape=True)

          Will render as::

            somecolumn LIKE '%' || :param ESCAPE '/'

          With the value of :param as ``"foo/%bar"``.

          .. versionadded:: 1.2

          .. versionchanged:: 1.2.0 The
            :paramref:`.ColumnOperators.endswith.autoescape` parameter is
             now a simple boolean rather than a character; the escape
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            somecolumn.endswith("foo/%bar", escape="^")

          Will render as::

            somecolumn LIKE '%' || :param ESCAPE '^'

          The parameter may also be combined with
          :paramref:`.ColumnOperators.endswith.autoescape`::

            somecolumn.endswith("foo%bar^bat", escape="^", autoescape=True)

          Where above, the given literal parameter will be converted to
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        .. seealso::

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