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import logging
import os
class TypeData:
def __init__(self, default_type, as_type):
self.default_type = default_type
self.as_type = as_type
def __repr__(self):
return f"{self.__class__.__name__}(base={self.default_type}, as={self.as_type})"
def convert(self, value):
return self.default_type(value)
class BoolType(TypeData):
BOOLEAN_STATES = {
"1": True,
"yes": True,
"true": True,
"on": True,
"0": False,
"no": False,
"false": False,
"off": False,
}
def convert(self, value):
if value.lower() not in self.BOOLEAN_STATES:
raise ValueError(f"Not a boolean: {value}")
return self.BOOLEAN_STATES[value.lower()]
class NoneType(TypeData):
def convert(self, value):
if not value:
return None
return str(value)
class ListType(TypeData):
def _validate(self):
""" """
def convert(self, value, flatten=True): # noqa: U100
values = self.split_values(value)
result = []
for value in values:
sub_values = value.split(os.pathsep)
result.extend(sub_values)
converted = [self.as_type(i) for i in result]
return converted
def split_values(self, value):
"""Split the provided value into a list.
First this is done by newlines. If there were no newlines in the text,
then we next try to split by comma.
"""
if isinstance(value, (str, bytes)):
# Use `splitlines` rather than a custom check for whether there is
# more than one line. This ensures that the full `splitlines()`
# logic is supported here.
values = value.splitlines()
if len(values) <= 1:
values = value.split(",")
values = filter(None, [x.strip() for x in values])
else:
values = list(value)
return values
def convert(value, as_type, source):
"""Convert the value as a given type where the value comes from the given source"""
try:
return as_type.convert(value)
except Exception as exception:
logging.warning("%s failed to convert %r as %r because %r", source, value, as_type, exception)
raise
_CONVERT = {bool: BoolType, type(None): NoneType, list: ListType}
def get_type(action):
default_type = type(action.default)
as_type = default_type if action.type is None else action.type
return _CONVERT.get(default_type, TypeData)(default_type, as_type)
__all__ = [
"convert",
"get_type",
]