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comparison libervia/frontends/tools/css_color.py @ 4074:26b7ed2817da

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refactoring: rename `sat_frontends` to `libervia.frontends`
author Goffi <goffi@goffi.org>
date Fri, 02 Jun 2023 14:12:38 +0200
parents sat_frontends/tools/css_color.py@4b842c1fb686
children
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4073:7c5654c54fed 4074:26b7ed2817da
1 #!/usr/bin/env python3
2
3
4 # CSS color parsing
5 # Copyright (C) 2009-2021 Jérome-Poisson
6
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
11
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
16
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
19
20 from libervia.backend.core.log import getLogger
21
22 log = getLogger(__name__)
23
24
25 CSS_COLORS = {
26 "black": "000000",
27 "silver": "c0c0c0",
28 "gray": "808080",
29 "white": "ffffff",
30 "maroon": "800000",
31 "red": "ff0000",
32 "purple": "800080",
33 "fuchsia": "ff00ff",
34 "green": "008000",
35 "lime": "00ff00",
36 "olive": "808000",
37 "yellow": "ffff00",
38 "navy": "000080",
39 "blue": "0000ff",
40 "teal": "008080",
41 "aqua": "00ffff",
42 "orange": "ffa500",
43 "aliceblue": "f0f8ff",
44 "antiquewhite": "faebd7",
45 "aquamarine": "7fffd4",
46 "azure": "f0ffff",
47 "beige": "f5f5dc",
48 "bisque": "ffe4c4",
49 "blanchedalmond": "ffebcd",
50 "blueviolet": "8a2be2",
51 "brown": "a52a2a",
52 "burlywood": "deb887",
53 "cadetblue": "5f9ea0",
54 "chartreuse": "7fff00",
55 "chocolate": "d2691e",
56 "coral": "ff7f50",
57 "cornflowerblue": "6495ed",
58 "cornsilk": "fff8dc",
59 "crimson": "dc143c",
60 "darkblue": "00008b",
61 "darkcyan": "008b8b",
62 "darkgoldenrod": "b8860b",
63 "darkgray": "a9a9a9",
64 "darkgreen": "006400",
65 "darkgrey": "a9a9a9",
66 "darkkhaki": "bdb76b",
67 "darkmagenta": "8b008b",
68 "darkolivegreen": "556b2f",
69 "darkorange": "ff8c00",
70 "darkorchid": "9932cc",
71 "darkred": "8b0000",
72 "darksalmon": "e9967a",
73 "darkseagreen": "8fbc8f",
74 "darkslateblue": "483d8b",
75 "darkslategray": "2f4f4f",
76 "darkslategrey": "2f4f4f",
77 "darkturquoise": "00ced1",
78 "darkviolet": "9400d3",
79 "deeppink": "ff1493",
80 "deepskyblue": "00bfff",
81 "dimgray": "696969",
82 "dimgrey": "696969",
83 "dodgerblue": "1e90ff",
84 "firebrick": "b22222",
85 "floralwhite": "fffaf0",
86 "forestgreen": "228b22",
87 "gainsboro": "dcdcdc",
88 "ghostwhite": "f8f8ff",
89 "gold": "ffd700",
90 "goldenrod": "daa520",
91 "greenyellow": "adff2f",
92 "grey": "808080",
93 "honeydew": "f0fff0",
94 "hotpink": "ff69b4",
95 "indianred": "cd5c5c",
96 "indigo": "4b0082",
97 "ivory": "fffff0",
98 "khaki": "f0e68c",
99 "lavender": "e6e6fa",
100 "lavenderblush": "fff0f5",
101 "lawngreen": "7cfc00",
102 "lemonchiffon": "fffacd",
103 "lightblue": "add8e6",
104 "lightcoral": "f08080",
105 "lightcyan": "e0ffff",
106 "lightgoldenrodyellow": "fafad2",
107 "lightgray": "d3d3d3",
108 "lightgreen": "90ee90",
109 "lightgrey": "d3d3d3",
110 "lightpink": "ffb6c1",
111 "lightsalmon": "ffa07a",
112 "lightseagreen": "20b2aa",
113 "lightskyblue": "87cefa",
114 "lightslategray": "778899",
115 "lightslategrey": "778899",
116 "lightsteelblue": "b0c4de",
117 "lightyellow": "ffffe0",
118 "limegreen": "32cd32",
119 "linen": "faf0e6",
120 "mediumaquamarine": "66cdaa",
121 "mediumblue": "0000cd",
122 "mediumorchid": "ba55d3",
123 "mediumpurple": "9370db",
124 "mediumseagreen": "3cb371",
125 "mediumslateblue": "7b68ee",
126 "mediumspringgreen": "00fa9a",
127 "mediumturquoise": "48d1cc",
128 "mediumvioletred": "c71585",
129 "midnightblue": "191970",
130 "mintcream": "f5fffa",
131 "mistyrose": "ffe4e1",
132 "moccasin": "ffe4b5",
133 "navajowhite": "ffdead",
134 "oldlace": "fdf5e6",
135 "olivedrab": "6b8e23",
136 "orangered": "ff4500",
137 "orchid": "da70d6",
138 "palegoldenrod": "eee8aa",
139 "palegreen": "98fb98",
140 "paleturquoise": "afeeee",
141 "palevioletred": "db7093",
142 "papayawhip": "ffefd5",
143 "peachpuff": "ffdab9",
144 "peru": "cd853f",
145 "pink": "ffc0cb",
146 "plum": "dda0dd",
147 "powderblue": "b0e0e6",
148 "rosybrown": "bc8f8f",
149 "royalblue": "4169e1",
150 "saddlebrown": "8b4513",
151 "salmon": "fa8072",
152 "sandybrown": "f4a460",
153 "seagreen": "2e8b57",
154 "seashell": "fff5ee",
155 "sienna": "a0522d",
156 "skyblue": "87ceeb",
157 "slateblue": "6a5acd",
158 "slategray": "708090",
159 "slategrey": "708090",
160 "snow": "fffafa",
161 "springgreen": "00ff7f",
162 "steelblue": "4682b4",
163 "tan": "d2b48c",
164 "thistle": "d8bfd8",
165 "tomato": "ff6347",
166 "turquoise": "40e0d0",
167 "violet": "ee82ee",
168 "wheat": "f5deb3",
169 "whitesmoke": "f5f5f5",
170 "yellowgreen": "9acd32",
171 "rebeccapurple": "663399",
172 }
173 DEFAULT = "000000"
174
175
176 def parse(raw_value, as_string=True):
177 """parse CSS color value and return normalised value
178
179 @param raw_value(unicode): CSS value
180 @param as_string(bool): if True return a string,
181 else return a tuple of int
182 @return (unicode, tuple): normalised value
183 if as_string is True, value is 3 or 4 hex words (e.g. u"ff00aabb")
184 else value is a 3 or 4 tuple of int (e.g.: (255, 0, 170, 187)).
185 If present, the 4th value is the alpha channel
186 If value can't be parsed, a warning message is logged, and DEFAULT is returned
187 """
188 raw_value = raw_value.strip().lower()
189 if raw_value.startswith("#"):
190 # we have a hexadecimal value
191 str_value = raw_value[1:]
192 if len(raw_value) in (3, 4):
193 str_value = "".join([2 * v for v in str_value])
194 elif raw_value.startswith("rgb"):
195 left_p = raw_value.find("(")
196 right_p = raw_value.find(")")
197 rgb_values = [v.strip() for v in raw_value[left_p + 1 : right_p].split(",")]
198 expected_len = 4 if raw_value.startswith("rgba") else 3
199 if len(rgb_values) != expected_len:
200 log.warning("incorrect value: {}".format(raw_value))
201 str_value = DEFAULT
202 else:
203 int_values = []
204 for rgb_v in rgb_values:
205 p_idx = rgb_v.find("%")
206 if p_idx == -1:
207 # base 10 value
208 try:
209 int_v = int(rgb_v)
210 if int_v > 255:
211 raise ValueError("value exceed 255")
212 int_values.append(int_v)
213 except ValueError:
214 log.warning("invalid int: {}".format(rgb_v))
215 int_values.append(0)
216 else:
217 # percentage
218 try:
219 int_v = int(int(rgb_v[:p_idx]) / 100.0 * 255)
220 if int_v > 255:
221 raise ValueError("value exceed 255")
222 int_values.append(int_v)
223 except ValueError:
224 log.warning("invalid percent value: {}".format(rgb_v))
225 int_values.append(0)
226 str_value = "".join(["{:02x}".format(v) for v in int_values])
227 elif raw_value.startswith("hsl"):
228 log.warning("hue-saturation-lightness not handled yet") # TODO
229 str_value = DEFAULT
230 else:
231 try:
232 str_value = CSS_COLORS[raw_value]
233 except KeyError:
234 log.warning("unrecognised format: {}".format(raw_value))
235 str_value = DEFAULT
236
237 if as_string:
238 return str_value
239 else:
240 return tuple(
241 [
242 int(str_value[i] + str_value[i + 1], 16)
243 for i in range(0, len(str_value), 2)
244 ]
245 )