Mercurial > libervia-backend

annotate sat/tools/common/utils.py @ 3327:ddc10f76fb7e

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changelog: update
author Goffi <goffi@goffi.org>
date Sun, 02 Aug 2020 20:31:06 +0200
parents 84f77f04aa08
children be6d91572633
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python3
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2
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3 # SàT: a XMPP client
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4 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 """Misc utils for both backend and frontends"""
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20
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21 import collections.abc
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22
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23
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24 def per_luminance(red, green, blue):
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25 """Caculate the perceived luminance of a RGB color
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26
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27 @param red(int): 0-1 normalized value of red
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28 @param green(int): 0-1 normalized value of green
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29 @param blue(int): 0-1 normalized value of blue
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30 @return (float): 0-1 value of luminance (<0.5 is dark, else it's light)
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31 """
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32 # cf. https://stackoverflow.com/a/1855903, thanks Gacek
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33
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34 return 0.299 * red + 0.587 * green + 0.114 * blue
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35
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36
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37 def recursive_update(ori: dict, update: dict):
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38 """Recursively update a dictionary"""
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39 # cf. https://stackoverflow.com/a/3233356, thanks Alex Martelli
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40 for k, v in update.items():
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41 if isinstance(v, collections.abc.Mapping):
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42 ori[k] = recursive_update(ori.get(k, {}), v)
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43 else:
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44 ori[k] = v
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45 return ori
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46
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47 class OrderedSet(collections.abc.MutableSet):
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48 """A mutable sequence which doesn't keep duplicates"""
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49 # TODO: complete missing set methods
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50
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51 def __init__(self, values=None):
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52 self._dict = {}
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53 if values is not None:
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54 self.update(values)
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55
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56 def __len__(self):
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57 return len(self._dict)
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58
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59 def __iter__(self):
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60 return iter(self._dict.keys())
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61
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62 def __contains__(self, item):
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63 return item in self._dict
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64
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65 def add(self, item):
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66 self._dict[item] = None
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67
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68 def discard(self, item):
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69 try:
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70 del self._dict[item]
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71 except KeyError:
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72 pass
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73
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74 def update(self, items):
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75 self._dict.update({i: None for i in items})