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from agate.data_types.base import DataType
class Text(DataType):
"""
Data representing text.
:param cast_nulls:
If :code:`True`, values in :data:`.DEFAULT_NULL_VALUES` will be
converted to `None`. Disable to retain them as strings.
"""
def __init__(self, cast_nulls=True, **kwargs):
super().__init__(**kwargs)
self.cast_nulls = cast_nulls
def cast(self, d):
"""
Cast a single value to :func:`unicode` (:func:`str` in Python 3).
:param d:
A value to cast.
:returns:
:func:`unicode` (:func:`str` in Python 3) or :code:`None`
"""
if d is None:
return d
if isinstance(d, str):
if self.cast_nulls and d.strip().lower() in self.null_values:
return None
return str(d)
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