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comparison frontends/src/tools/css_color.py @ 2077:95ad70ad815c

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frontends (tools): added a module to parse CSS colors
author Goffi <goffi@goffi.org>
date Sun, 25 Sep 2016 15:41:43 +0200
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children 8b37a62336c3
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2076:529a6d7f7f6a 2077:95ad70ad815c
1 #!/usr/bin/env python2
2 # -*- coding: utf-8 -*-
3
4 # CSS color parsing
5 # Copyright (C) 2009-2016 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 sat.core.log import getLogger
21 log = getLogger(__name__)
22
23
24 CSS_COLORS = {
25 u"black": u"000000",
26 u"silver": u"c0c0c0",
27 u"gray": u"808080",
28 u"white": u"ffffff",
29 u"maroon": u"800000",
30 u"red": u"ff0000",
31 u"purple": u"800080",
32 u"fuchsia": u"ff00ff",
33 u"green": u"008000",
34 u"lime": u"00ff00",
35 u"olive": u"808000",
36 u"yellow": u"ffff00",
37 u"navy": u"000080",
38 u"blue": u"0000ff",
39 u"teal": u"008080",
40 u"aqua": u"00ffff",
41 u"orange": u"ffa500",
42 u"aliceblue": u"f0f8ff",
43 u"antiquewhite": u"faebd7",
44 u"aquamarine": u"7fffd4",
45 u"azure": u"f0ffff",
46 u"beige": u"f5f5dc",
47 u"bisque": u"ffe4c4",
48 u"blanchedalmond": u"ffebcd",
49 u"blueviolet": u"8a2be2",
50 u"brown": u"a52a2a",
51 u"burlywood": u"deb887",
52 u"cadetblue": u"5f9ea0",
53 u"chartreuse": u"7fff00",
54 u"chocolate": u"d2691e",
55 u"coral": u"ff7f50",
56 u"cornflowerblue": u"6495ed",
57 u"cornsilk": u"fff8dc",
58 u"crimson": u"dc143c",
59 u"darkblue": u"00008b",
60 u"darkcyan": u"008b8b",
61 u"darkgoldenrod": u"b8860b",
62 u"darkgray": u"a9a9a9",
63 u"darkgreen": u"006400",
64 u"darkgrey": u"a9a9a9",
65 u"darkkhaki": u"bdb76b",
66 u"darkmagenta": u"8b008b",
67 u"darkolivegreen": u"556b2f",
68 u"darkorange": u"ff8c00",
69 u"darkorchid": u"9932cc",
70 u"darkred": u"8b0000",
71 u"darksalmon": u"e9967a",
72 u"darkseagreen": u"8fbc8f",
73 u"darkslateblue": u"483d8b",
74 u"darkslategray": u"2f4f4f",
75 u"darkslategrey": u"2f4f4f",
76 u"darkturquoise": u"00ced1",
77 u"darkviolet": u"9400d3",
78 u"deeppink": u"ff1493",
79 u"deepskyblue": u"00bfff",
80 u"dimgray": u"696969",
81 u"dimgrey": u"696969",
82 u"dodgerblue": u"1e90ff",
83 u"firebrick": u"b22222",
84 u"floralwhite": u"fffaf0",
85 u"forestgreen": u"228b22",
86 u"gainsboro": u"dcdcdc",
87 u"ghostwhite": u"f8f8ff",
88 u"gold": u"ffd700",
89 u"goldenrod": u"daa520",
90 u"greenyellow": u"adff2f",
91 u"grey": u"808080",
92 u"honeydew": u"f0fff0",
93 u"hotpink": u"ff69b4",
94 u"indianred": u"cd5c5c",
95 u"indigo": u"4b0082",
96 u"ivory": u"fffff0",
97 u"khaki": u"f0e68c",
98 u"lavender": u"e6e6fa",
99 u"lavenderblush": u"fff0f5",
100 u"lawngreen": u"7cfc00",
101 u"lemonchiffon": u"fffacd",
102 u"lightblue": u"add8e6",
103 u"lightcoral": u"f08080",
104 u"lightcyan": u"e0ffff",
105 u"lightgoldenrodyellow": u"fafad2",
106 u"lightgray": u"d3d3d3",
107 u"lightgreen": u"90ee90",
108 u"lightgrey": u"d3d3d3",
109 u"lightpink": u"ffb6c1",
110 u"lightsalmon": u"ffa07a",
111 u"lightseagreen": u"20b2aa",
112 u"lightskyblue": u"87cefa",
113 u"lightslategray": u"778899",
114 u"lightslategrey": u"778899",
115 u"lightsteelblue": u"b0c4de",
116 u"lightyellow": u"ffffe0",
117 u"limegreen": u"32cd32",
118 u"linen": u"faf0e6",
119 u"mediumaquamarine": u"66cdaa",
120 u"mediumblue": u"0000cd",
121 u"mediumorchid": u"ba55d3",
122 u"mediumpurple": u"9370db",
123 u"mediumseagreen": u"3cb371",
124 u"mediumslateblue": u"7b68ee",
125 u"mediumspringgreen": u"00fa9a",
126 u"mediumturquoise": u"48d1cc",
127 u"mediumvioletred": u"c71585",
128 u"midnightblue": u"191970",
129 u"mintcream": u"f5fffa",
130 u"mistyrose": u"ffe4e1",
131 u"moccasin": u"ffe4b5",
132 u"navajowhite": u"ffdead",
133 u"oldlace": u"fdf5e6",
134 u"olivedrab": u"6b8e23",
135 u"orangered": u"ff4500",
136 u"orchid": u"da70d6",
137 u"palegoldenrod": u"eee8aa",
138 u"palegreen": u"98fb98",
139 u"paleturquoise": u"afeeee",
140 u"palevioletred": u"db7093",
141 u"papayawhip": u"ffefd5",
142 u"peachpuff": u"ffdab9",
143 u"peru": u"cd853f",
144 u"pink": u"ffc0cb",
145 u"plum": u"dda0dd",
146 u"powderblue": u"b0e0e6",
147 u"rosybrown": u"bc8f8f",
148 u"royalblue": u"4169e1",
149 u"saddlebrown": u"8b4513",
150 u"salmon": u"fa8072",
151 u"sandybrown": u"f4a460",
152 u"seagreen": u"2e8b57",
153 u"seashell": u"fff5ee",
154 u"sienna": u"a0522d",
155 u"skyblue": u"87ceeb",
156 u"slateblue": u"6a5acd",
157 u"slategray": u"708090",
158 u"slategrey": u"708090",
159 u"snow": u"fffafa",
160 u"springgreen": u"00ff7f",
161 u"steelblue": u"4682b4",
162 u"tan": u"d2b48c",
163 u"thistle": u"d8bfd8",
164 u"tomato": u"ff6347",
165 u"turquoise": u"40e0d0",
166 u"violet": u"ee82ee",
167 u"wheat": u"f5deb3",
168 u"whitesmoke": u"f5f5f5",
169 u"yellowgreen": u"9acd32",
170 u"rebeccapurple": u"663399"
171 }
172 DEFAULT = u"000000"
173
174
175 def parse(raw_value, as_string=True):
176 """parse CSS color value and return normalised value
177
178 @param raw_value(unicode): CSS value
179 @param as_string(bool): if True return a string,
180 else return a tuple of int
181 @return (unicode, tuple): normalised value
182 if as_string is True, value is 3 or 4 hex words (e.g. u"ff00aabb")
183 else value is a 3 or 4 tuple of int (e.g.: (255, 0, 170, 187)).
184 If present, the 4th value is the alpha channel
185 If value can't be parsed, a warning message is logged, and DEFAULT is returned
186 """
187 raw_value = raw_value.strip().lower()
188 if raw_value.startswith(u'#'):
189 # we have a hexadecimal value
190 str_value = raw_value[1:]
191 if len(raw_value) in (3,4):
192 str_value = u''.join([2*v for v in str_value])
193 elif raw_value.startswith(u'rgb'):
194 left_p = raw_value.find(u'(')
195 right_p = raw_value.find(u')')
196 rgb_values = [v.strip() for v in raw_value[left_p+1:right_p].split(',')]
197 expected_len = 4 if raw_value.startswith(u'rgba') else 3
198 if len(rgb_values) != expected_len:
199 log.warning(u"incorrect value: {}".format(raw_value))
200 str_value = DEFAULT
201 else:
202 int_values = []
203 for rgb_v in rgb_values:
204 p_idx = rgb_v.find(u'%')
205 if p_idx == -1:
206 # base 10 value
207 try:
208 int_v = int(rgb_v)
209 if int_v > 255:
210 raise ValueError(u"value exceed 255")
211 int_values.append(int_v)
212 except ValueError:
213 log.warning(u"invalid int: {}".format(rgb_v))
214 int_values.append(0)
215 else:
216 # percentage
217 try:
218 int_v = int(int(rgb_v[:p_idx]) / 100.0 * 255)
219 if int_v > 255:
220 raise ValueError(u"value exceed 255")
221 int_values.append(int_v)
222 except ValueError:
223 log.warning(u"invalid percent value: {}".format(rgb_v))
224 int_values.append(0)
225 str_value = u''.join([u"{:02x}".format(v) for v in int_values])
226 elif raw_value.startswith(u'hsl'):
227 log.warning(u"hue-saturation-lightness not handled yet") # TODO
228 str_value = DEFAULT
229 else:
230 try:
231 str_value = CSS_COLORS[raw_value]
232 except KeyError:
233 log.warning(u"unrecognised format: {}".format(raw_value))
234 str_value = DEFAULT
235
236 if as_string:
237 return str_value
238 else:
239 return tuple([int(str_value[i]+str_value[i+1], 16) for i in xrange(0, len(str_value), 2)])