#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (c) 2009-2010, Nicolas Clairon
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the University of California, Berkeley nor the
# names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[docs]class SchemaOperator(object):
repr = None
def __init__(self, *args):
assert self.repr is not None
self._operands = list(args)
def __repr__(self):
return str(self)
def __iter__(self):
for operand in self._operands:
yield operand
def __eq__(self, other):
return type(self) == type(other) and self._operands == other._operands
[docs] def validate(self, value):
raise NotImplementedError
[docs]class OR(SchemaOperator):
repr = 'or'
def __init__(self, *args):
super(OR, self).__init__(*args)
def __str__(self):
repr = ' %s ' % self.repr
return '<'+repr.join([i.__name__ for i in self._operands]) + '>'
[docs] def validate(self, value):
return isinstance(value, tuple(self._operands))
[docs]class NOT(SchemaOperator):
repr = 'not'
def __init__(self, *args):
super(NOT, self).__init__(*args)
def __str__(self):
repr = ', %s ' % self.repr
return '<not '+repr.join([i.__name__ for i in self._operands]) + '>'
[docs] def validate(self, value):
return not isinstance(value, tuple(self._operands))
[docs]class IS(SchemaOperator):
repr = 'is'
def __init__(self, *args):
super(IS, self).__init__(*args)
def __str__(self):
representation = ' or %s ' % self.repr
return '<is '+representation.join([repr(i) for i in self._operands]) + '>'
[docs] def validate(self, value):
if value in self._operands:
for op in self._operands:
if value == op and isinstance(value, type(op)):
return True
return False