container_app_conf/entry/range.py
# Copyright (c) 2019 Markus Ressel
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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from py_range_parse import Range, parse_range
from container_app_conf import ConfigEntry
class RangeConfigEntry(ConfigEntry):
_example = "[-5..5]"
def _value_to_type(self, value: any) -> Range or None:
"""
Tries to convert the given value to a range.
:param value: the value to parse
:return: the parsed range value
"""
if isinstance(value, Range):
return value
elif isinstance(value, str):
parsed = parse_range(value)
if parsed is None:
raise ValueError("Cannot parse the range format: {}".format(value))
return parsed
else:
raise ValueError("Unsupported type: {}".format(type(value)))