Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/attr/setters.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """ |
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2 Commonly used hooks for on_setattr. |
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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 . import _config |
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8 from .exceptions import FrozenAttributeError |
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9 |
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10 |
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11 def pipe(*setters): |
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12 """ |
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13 Run all *setters* and return the return value of the last one. |
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14 |
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15 .. versionadded:: 20.1.0 |
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16 """ |
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17 |
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18 def wrapped_pipe(instance, attrib, new_value): |
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19 rv = new_value |
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20 |
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21 for setter in setters: |
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22 rv = setter(instance, attrib, rv) |
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23 |
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24 return rv |
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25 |
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26 return wrapped_pipe |
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27 |
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28 |
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29 def frozen(_, __, ___): |
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30 """ |
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31 Prevent an attribute to be modified. |
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32 |
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33 .. versionadded:: 20.1.0 |
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34 """ |
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35 raise FrozenAttributeError() |
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36 |
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37 |
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38 def validate(instance, attrib, new_value): |
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39 """ |
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40 Run *attrib*'s validator on *new_value* if it has one. |
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41 |
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42 .. versionadded:: 20.1.0 |
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43 """ |
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44 if _config._run_validators is False: |
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45 return new_value |
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46 |
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47 v = attrib.validator |
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48 if not v: |
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49 return new_value |
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50 |
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51 v(instance, attrib, new_value) |
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52 |
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53 return new_value |
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54 |
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55 |
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56 def convert(instance, attrib, new_value): |
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57 """ |
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58 Run *attrib*'s converter -- if it has one -- on *new_value* and return the |
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59 result. |
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60 |
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61 .. versionadded:: 20.1.0 |
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62 """ |
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63 c = attrib.converter |
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64 if c: |
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65 return c(new_value) |
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66 |
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67 return new_value |
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68 |
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69 |
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70 NO_OP = object() |
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71 """ |
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72 Sentinel for disabling class-wide *on_setattr* hooks for certain attributes. |
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73 |
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74 Does not work in `pipe` or within lists. |
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75 |
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76 .. versionadded:: 20.1.0 |
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77 """ |