Mercurial > libervia-backend

annotate libervia/backend/tools/common/utils.py @ 4071:4b842c1fb686

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refactoring: renamed `sat` package to `libervia.backend`
author Goffi <goffi@goffi.org>
date Fri, 02 Jun 2023 11:49:51 +0200
parents sat/tools/common/utils.py@524856bd7b19
children e11b13418ba6
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1 #!/usr/bin/env python3
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2
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7550ae9cfbac Renamed the project from "Salut à Toi" to "Libervia":
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3 # Libervia: an XMPP client
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be6d91572633 date update
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4 # Copyright (C) 2009-2021 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 size_units = {
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23 "b": 1,
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24 "kb": 1000,
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25 "mb": 1000**2,
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26 "gb": 1000**3,
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27 "tb": 1000**4,
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28 "pb": 1000**5,
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29 "eb": 1000**6,
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30 "zb": 1000**7,
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31 "yb": 1000**8,
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32 "o": 1,
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33 "ko": 1000,
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34 "mo": 1000**2,
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35 "go": 1000**3,
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36 "to": 1000**4,
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37 "po": 1000**5,
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38 "eo": 1000**6,
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39 "zo": 1000**7,
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40 "yo": 1000**8,
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41 "kib": 1024,
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42 "mib": 1024**2,
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43 "gib": 1024**3,
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44 "tib": 1024**4,
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45 "pib": 1024**5,
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46 "eib": 1024**6,
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47 "zib": 1024**7,
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48 "yib": 1024**8,
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49 "kio": 1024,
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50 "mio": 1024**2,
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51 "gio": 1024**3,
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52 "tio": 1024**4,
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53 "pio": 1024**5,
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54 "eio": 1024**6,
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55 "zio": 1024**7,
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56 "yio": 1024**8,
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57 }
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58
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59
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60 def per_luminance(red, green, blue):
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61 """Caculate the perceived luminance of a RGB color
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62
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63 @param red(int): 0-1 normalized value of red
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64 @param green(int): 0-1 normalized value of green
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65 @param blue(int): 0-1 normalized value of blue
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66 @return (float): 0-1 value of luminance (<0.5 is dark, else it's light)
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67 """
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68 # cf. https://stackoverflow.com/a/1855903, thanks Gacek
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69
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70 return 0.299 * red + 0.587 * green + 0.114 * blue
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71
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72
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73 def recursive_update(ori: dict, update: dict):
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74 """Recursively update a dictionary"""
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75 # cf. https://stackoverflow.com/a/3233356, thanks Alex Martelli
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76 for k, v in update.items():
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77 if isinstance(v, collections.abc.Mapping):
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78 ori[k] = recursive_update(ori.get(k, {}), v)
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79 else:
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80 ori[k] = v
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81 return ori
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82
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83 class OrderedSet(collections.abc.MutableSet):
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84 """A mutable sequence which doesn't keep duplicates"""
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85 # TODO: complete missing set methods
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86
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87 def __init__(self, values=None):
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88 self._dict = {}
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89 if values is not None:
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90 self.update(values)
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91
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92 def __len__(self):
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93 return len(self._dict)
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94
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95 def __iter__(self):
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96 return iter(self._dict.keys())
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97
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98 def __contains__(self, item):
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99 return item in self._dict
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100
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101 def add(self, item):
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102 self._dict[item] = None
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103
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104 def discard(self, item):
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105 try:
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106 del self._dict[item]
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107 except KeyError:
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108 pass
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109
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110 def update(self, items):
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111 self._dict.update({i: None for i in items})
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112
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113
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114 def parse_size(size):
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115 """Parse a file size with optional multiple symbole"""
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116 try:
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117 return int(size)
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118 except ValueError:
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119 number = []
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120 symbol = []
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121 try:
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122 for c in size:
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123 if c == " ":
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124 continue
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125 if c.isdigit():
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126 number.append(c)
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127 elif c.isalpha():
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128 symbol.append(c)
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129 else:
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130 raise ValueError("unexpected char in size: {c!r} (size: {size!r})")
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131 number = int("".join(number))
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132 symbol = "".join(symbol)
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133 if symbol:
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134 try:
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135 multiplier = size_units[symbol.lower()]
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136 except KeyError:
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137 raise ValueError(
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138 "unknown size multiplier symbole: {symbol!r} (size: {size!r})")
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139 else:
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140 return number * multiplier
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141 return number
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142 except Exception as e:
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143 raise ValueError(f"invalid size: {e}")
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144
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145
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146 def get_size_multiplier(size, suffix="o"):
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147 """Get multiplier of a file size"""
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148 size = int(size)
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149 #  cf. https://stackoverflow.com/a/1094933 (thanks)
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150 for unit in ["", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"]:
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151 if abs(size) < 1024.0:
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152 return size, f"{unit}{suffix}"
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153 size /= 1024.0
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154 return size, f"Yi{suffix}"
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155
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156
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157 def get_human_size(size, suffix="o", sep=" "):
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158 size, symbol = get_size_multiplier(size, suffix)
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159 return f"{size:.2f}{sep}{symbol}"