Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/attr/converters.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
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1 """
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2 Commonly useful converters.
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3 """
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4
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5 from __future__ import absolute_import, division, print_function
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6
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7 from ._make import NOTHING, Factory, pipe
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8
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9
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10 __all__ = [
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11 "pipe",
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12 "optional",
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13 "default_if_none",
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14 ]
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15
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16
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17 def optional(converter):
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18 """
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19 A converter that allows an attribute to be optional. An optional attribute
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20 is one which can be set to ``None``.
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21
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22 :param callable converter: the converter that is used for non-``None``
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23 values.
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24
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25 .. versionadded:: 17.1.0
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26 """
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27
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28 def optional_converter(val):
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29 if val is None:
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30 return None
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31 return converter(val)
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32
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33 return optional_converter
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34
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35
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36 def default_if_none(default=NOTHING, factory=None):
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37 """
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38 A converter that allows to replace ``None`` values by *default* or the
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39 result of *factory*.
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40
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41 :param default: Value to be used if ``None`` is passed. Passing an instance
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42 of `attr.Factory` is supported, however the ``takes_self`` option
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43 is *not*.
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44 :param callable factory: A callable that takes not parameters whose result
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45 is used if ``None`` is passed.
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46
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47 :raises TypeError: If **neither** *default* or *factory* is passed.
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48 :raises TypeError: If **both** *default* and *factory* are passed.
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49 :raises ValueError: If an instance of `attr.Factory` is passed with
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50 ``takes_self=True``.
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51
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52 .. versionadded:: 18.2.0
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53 """
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54 if default is NOTHING and factory is None:
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55 raise TypeError("Must pass either `default` or `factory`.")
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56
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57 if default is not NOTHING and factory is not None:
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58 raise TypeError(
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59 "Must pass either `default` or `factory` but not both."
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60 )
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61
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62 if factory is not None:
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63 default = Factory(factory)
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64
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65 if isinstance(default, Factory):
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66 if default.takes_self:
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67 raise ValueError(
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68 "`takes_self` is not supported by default_if_none."
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69 )
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70
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71 def default_if_none_converter(val):
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72 if val is not None:
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73 return val
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74
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75 return default.factory()
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76
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77 else:
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78
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79 def default_if_none_converter(val):
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80 if val is not None:
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81 return val
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82
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83 return default
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84
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85 return default_if_none_converter