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# -*- coding: utf-8 -*-
# Copyright (c) 2010 Mark Sandstrom
# Copyright (c) 2011-2013 Raphaël Barrois
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""Additional declarations for "fuzzy" attribute definitions."""
import random
from . import declarations
class BaseFuzzyAttribute(declarations.OrderedDeclaration):
"""Base class for fuzzy attributes.
Custom fuzzers should override the `fuzz()` method.
"""
def fuzz(self):
raise NotImplementedError()
def evaluate(self, sequence, obj, create, extra=None, containers=()):
return self.fuzz()
class FuzzyAttribute(BaseFuzzyAttribute):
"""Similar to LazyAttribute, but yields random values.
Attributes:
function (callable): function taking no parameters and returning a
random value.
"""
def __init__(self, fuzzer, **kwargs):
super(FuzzyAttribute, self).__init__(**kwargs)
self.fuzzer = fuzzer
def fuzz(self):
return self.fuzzer()
class FuzzyChoice(BaseFuzzyAttribute):
"""Handles fuzzy choice of an attribute."""
def __init__(self, choices, **kwargs):
self.choices = list(choices)
super(FuzzyChoice, self).__init__(**kwargs)
def fuzz(self):
return random.choice(self.choices)
class FuzzyInteger(BaseFuzzyAttribute):
"""Random integer within a given range."""
def __init__(self, low, high=None, **kwargs):
if high is None:
high = low
low = 0
self.low = low
self.high = high
super(FuzzyInteger, self).__init__(**kwargs)
def fuzz(self):
return random.randint(self.low, self.high)
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