Mercurial > libervia-backend
view sat/tools/common/utils.py @ 3395:d6a482a78bda
tools (xml_tools): added `with_parent` and `with_children` argument to `elementCopy`
author | Goffi <goffi@goffi.org> |
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date | Thu, 12 Nov 2020 14:53:15 +0100 |
parents | 84f77f04aa08 |
children | be6d91572633 |
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#!/usr/bin/env python3 # SàT: a XMPP client # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. """Misc utils for both backend and frontends""" import collections.abc def per_luminance(red, green, blue): """Caculate the perceived luminance of a RGB color @param red(int): 0-1 normalized value of red @param green(int): 0-1 normalized value of green @param blue(int): 0-1 normalized value of blue @return (float): 0-1 value of luminance (<0.5 is dark, else it's light) """ # cf. https://stackoverflow.com/a/1855903, thanks Gacek return 0.299 * red + 0.587 * green + 0.114 * blue def recursive_update(ori: dict, update: dict): """Recursively update a dictionary""" # cf. https://stackoverflow.com/a/3233356, thanks Alex Martelli for k, v in update.items(): if isinstance(v, collections.abc.Mapping): ori[k] = recursive_update(ori.get(k, {}), v) else: ori[k] = v return ori class OrderedSet(collections.abc.MutableSet): """A mutable sequence which doesn't keep duplicates""" # TODO: complete missing set methods def __init__(self, values=None): self._dict = {} if values is not None: self.update(values) def __len__(self): return len(self._dict) def __iter__(self): return iter(self._dict.keys()) def __contains__(self, item): return item in self._dict def add(self, item): self._dict[item] = None def discard(self, item): try: del self._dict[item] except KeyError: pass def update(self, items): self._dict.update({i: None for i in items})