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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import unittest
from traits.api import HasTraits, Trait, TraitError, TraitHandler
from traits.trait_base import strx
# Validation via function
def validator(object, name, value):
if isinstance(value, str):
# arbitrary rule for testing
if value.find("fail") < 0:
return value
else:
raise TraitError
else:
raise TraitError
# Validation via Handler
class MyHandler(TraitHandler):
def validate(self, object, name, value):
try:
value = strx(value)
if value.find("fail") < 0:
return value
except:
pass
self.error(object, name, value)
def info(self):
msg = "a string not containing the character sequence 'fail'"
return msg
class Foo(HasTraits):
s = Trait("", validator)
class Bar(HasTraits):
s = Trait("", MyHandler())
class StrHandlerCase(unittest.TestCase):
def test_validator_function(self):
f = Foo()
self.assertEqual(f.s, "")
f.s = "ok"
self.assertEqual(f.s, "ok")
self.assertRaises(TraitError, setattr, f, "s", "should fail.")
self.assertEqual(f.s, "ok")
def test_validator_handler(self):
b = Bar()
self.assertEqual(b.s, "")
b.s = "ok"
self.assertEqual(b.s, "ok")
self.assertRaises(TraitError, setattr, b, "s", "should fail.")
self.assertEqual(b.s, "ok")
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