[FE-discuss] OneOf Validator list as callable

[Gregor Horvath]

Hello,

For late evaluation I need a OneOf Validator with a list argument as
callable. (or list / tuple)
I therefore made on enhanced version.
Is a patch / test desired?

Greg


class OneOf(FancyValidator):

"""
Tests that the value is one of the members of a given list.

If ``testValueList=True``, then if the input value is a list or
tuple, all the members of the sequence will be checked (i.e., the
input must be a subset of the allowed values).

Use ``hideList=True`` to keep the list of valid values out of the
error message in exceptions.

oneof = OneOf([1, 2, 3])
oneof.to_python(1)

1

oneof.to_python(4)

Traceback (most recent call last):
...
Invalid: Value must be one of: 1; 2; 3 (not 4)

oneof(testValueList=True).to_python([2, 3, [1, 2, 3]])

[2, 3, [1, 2, 3]]

oneof.to_python([2, 3, [1, 2, 3]])

Traceback (most recent call last):
...
Invalid: Value must be one of: 1; 2; 3 (not [2, 3, [1, 2, 3]])
"""

list = None
testValueList = False
hideList = False

__unpackargs__ = ('list',)

messages = {
'invalid': _("Invalid value"),
'notIn': _("Value must be one of: %(items)s (not %(value)r)"),
}

def validate_python(self, value, state):
try:
self.list = self.list()
except TypeError:
pass

if self.testValueList and isinstance(value, (list, tuple)):
for v in value:
self.validate_python(v, state)
else:
if not value in self.list:
if self.hideList:
raise Invalid(self.message('invalid', state),
value, state)
else:
items = '; '.join(map(str, self.list))
raise Invalid(self.message('notIn', state,
items=items,
value=value),
value, state)

[Andrea Riciputi]

Hi Gregor,
I was struggling with the very same problem today when I noticed your email. That's exactly what I need, and it works! Hope someone can notice your patch and apply it to the trunk. Have you already tried to email Ian directly?

Cheers,
Andrea

Post by Gregor Horvath
Hello,
For late evaluation I need a OneOf Validator with a list argument as
callable. (or list / tuple)
I therefore made on enhanced version.
Is a patch / test desired?
Greg
"""
Tests that the value is one of the members of a given list.
If ``testValueList=True``, then if the input value is a list or
tuple, all the members of the sequence will be checked (i.e., the
input must be a subset of the allowed values).
Use ``hideList=True`` to keep the list of valid values out of the
error message in exceptions.

oneof = OneOf([1, 2, 3])
oneof.to_python(1)

1

oneof.to_python(4)

...
Invalid: Value must be one of: 1; 2; 3 (not 4)

oneof(testValueList=True).to_python([2, 3, [1, 2, 3]])

[2, 3, [1, 2, 3]]

oneof.to_python([2, 3, [1, 2, 3]])

...
Invalid: Value must be one of: 1; 2; 3 (not [2, 3, [1, 2, 3]])
"""
list = None
testValueList = False
hideList = False
__unpackargs__ = ('list',)
messages = {
'invalid': _("Invalid value"),
'notIn': _("Value must be one of: %(items)s (not %(value)r)"),
}
self.list = self.list()
pass
self.validate_python(v, state)
raise Invalid(self.message('invalid', state),
value, state)
items = '; '.join(map(str, self.list))
raise Invalid(self.message('notIn', state,
items=items,
value=value),
value, state)
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