frontends (tools): added a module to parse CSS colors
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frontends/src/tools/css_color.py
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frontends/src/tools/css_color.py
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#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# CSS color parsing
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# Copyright (C) 2009-2016 Jérome-Poisson
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from sat.core.log import getLogger
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log = getLogger(__name__)
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CSS_COLORS = {
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u"black": u"000000",
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u"silver": u"c0c0c0",
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u"gray": u"808080",
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u"white": u"ffffff",
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u"maroon": u"800000",
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u"red": u"ff0000",
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u"purple": u"800080",
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u"fuchsia": u"ff00ff",
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u"green": u"008000",
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u"lime": u"00ff00",
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u"olive": u"808000",
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u"yellow": u"ffff00",
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u"navy": u"000080",
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u"blue": u"0000ff",
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u"teal": u"008080",
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u"aqua": u"00ffff",
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u"orange": u"ffa500",
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u"aliceblue": u"f0f8ff",
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u"antiquewhite": u"faebd7",
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u"aquamarine": u"7fffd4",
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u"azure": u"f0ffff",
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u"beige": u"f5f5dc",
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u"bisque": u"ffe4c4",
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u"blanchedalmond": u"ffebcd",
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u"blueviolet": u"8a2be2",
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u"brown": u"a52a2a",
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u"burlywood": u"deb887",
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u"cadetblue": u"5f9ea0",
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u"chartreuse": u"7fff00",
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u"chocolate": u"d2691e",
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u"coral": u"ff7f50",
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u"cornflowerblue": u"6495ed",
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u"cornsilk": u"fff8dc",
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u"crimson": u"dc143c",
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u"darkblue": u"00008b",
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u"darkcyan": u"008b8b",
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u"darkgoldenrod": u"b8860b",
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u"darkgray": u"a9a9a9",
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u"darkgreen": u"006400",
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u"darkgrey": u"a9a9a9",
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u"darkkhaki": u"bdb76b",
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u"darkmagenta": u"8b008b",
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u"darkolivegreen": u"556b2f",
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u"darkorange": u"ff8c00",
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u"darkorchid": u"9932cc",
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u"darkred": u"8b0000",
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u"darksalmon": u"e9967a",
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u"darkseagreen": u"8fbc8f",
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u"darkslateblue": u"483d8b",
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u"darkslategray": u"2f4f4f",
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u"darkslategrey": u"2f4f4f",
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u"darkturquoise": u"00ced1",
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u"darkviolet": u"9400d3",
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u"deeppink": u"ff1493",
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u"deepskyblue": u"00bfff",
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u"dimgray": u"696969",
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u"dimgrey": u"696969",
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u"dodgerblue": u"1e90ff",
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u"firebrick": u"b22222",
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u"floralwhite": u"fffaf0",
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u"forestgreen": u"228b22",
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u"gainsboro": u"dcdcdc",
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u"ghostwhite": u"f8f8ff",
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u"gold": u"ffd700",
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u"goldenrod": u"daa520",
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u"greenyellow": u"adff2f",
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u"grey": u"808080",
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u"honeydew": u"f0fff0",
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u"hotpink": u"ff69b4",
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u"indianred": u"cd5c5c",
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u"indigo": u"4b0082",
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u"ivory": u"fffff0",
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u"khaki": u"f0e68c",
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u"lavender": u"e6e6fa",
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u"lavenderblush": u"fff0f5",
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u"lawngreen": u"7cfc00",
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u"lemonchiffon": u"fffacd",
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u"lightblue": u"add8e6",
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u"lightcoral": u"f08080",
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u"lightcyan": u"e0ffff",
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u"lightgoldenrodyellow": u"fafad2",
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u"lightgray": u"d3d3d3",
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u"lightgreen": u"90ee90",
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u"lightgrey": u"d3d3d3",
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u"lightpink": u"ffb6c1",
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u"lightsalmon": u"ffa07a",
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u"lightseagreen": u"20b2aa",
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u"lightskyblue": u"87cefa",
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u"lightslategray": u"778899",
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u"lightslategrey": u"778899",
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u"lightsteelblue": u"b0c4de",
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u"lightyellow": u"ffffe0",
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u"limegreen": u"32cd32",
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u"linen": u"faf0e6",
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u"mediumaquamarine": u"66cdaa",
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u"mediumblue": u"0000cd",
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u"mediumorchid": u"ba55d3",
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u"mediumpurple": u"9370db",
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u"mediumseagreen": u"3cb371",
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u"mediumslateblue": u"7b68ee",
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u"mediumspringgreen": u"00fa9a",
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u"mediumturquoise": u"48d1cc",
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u"mediumvioletred": u"c71585",
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u"midnightblue": u"191970",
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u"mintcream": u"f5fffa",
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u"mistyrose": u"ffe4e1",
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u"moccasin": u"ffe4b5",
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u"navajowhite": u"ffdead",
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u"oldlace": u"fdf5e6",
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u"olivedrab": u"6b8e23",
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u"orangered": u"ff4500",
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u"orchid": u"da70d6",
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u"palegoldenrod": u"eee8aa",
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u"palegreen": u"98fb98",
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u"paleturquoise": u"afeeee",
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u"palevioletred": u"db7093",
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u"papayawhip": u"ffefd5",
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u"peachpuff": u"ffdab9",
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u"peru": u"cd853f",
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u"pink": u"ffc0cb",
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u"plum": u"dda0dd",
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u"powderblue": u"b0e0e6",
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u"rosybrown": u"bc8f8f",
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u"royalblue": u"4169e1",
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u"saddlebrown": u"8b4513",
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u"salmon": u"fa8072",
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u"sandybrown": u"f4a460",
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u"seagreen": u"2e8b57",
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u"seashell": u"fff5ee",
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u"sienna": u"a0522d",
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u"skyblue": u"87ceeb",
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u"slateblue": u"6a5acd",
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u"slategray": u"708090",
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u"slategrey": u"708090",
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u"snow": u"fffafa",
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u"springgreen": u"00ff7f",
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u"steelblue": u"4682b4",
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u"tan": u"d2b48c",
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u"thistle": u"d8bfd8",
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u"tomato": u"ff6347",
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u"turquoise": u"40e0d0",
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u"violet": u"ee82ee",
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u"wheat": u"f5deb3",
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u"whitesmoke": u"f5f5f5",
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u"yellowgreen": u"9acd32",
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u"rebeccapurple": u"663399"
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}
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DEFAULT = u"000000"
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def parse(raw_value, as_string=True):
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"""parse CSS color value and return normalised value
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@param raw_value(unicode): CSS value
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@param as_string(bool): if True return a string,
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else return a tuple of int
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@return (unicode, tuple): normalised value
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if as_string is True, value is 3 or 4 hex words (e.g. u"ff00aabb")
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else value is a 3 or 4 tuple of int (e.g.: (255, 0, 170, 187)).
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If present, the 4th value is the alpha channel
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If value can't be parsed, a warning message is logged, and DEFAULT is returned
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"""
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raw_value = raw_value.strip().lower()
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if raw_value.startswith(u'#'):
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# we have a hexadecimal value
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str_value = raw_value[1:]
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if len(raw_value) in (3,4):
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str_value = u''.join([2*v for v in str_value])
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elif raw_value.startswith(u'rgb'):
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left_p = raw_value.find(u'(')
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right_p = raw_value.find(u')')
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rgb_values = [v.strip() for v in raw_value[left_p+1:right_p].split(',')]
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expected_len = 4 if raw_value.startswith(u'rgba') else 3
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if len(rgb_values) != expected_len:
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log.warning(u"incorrect value: {}".format(raw_value))
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str_value = DEFAULT
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else:
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int_values = []
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for rgb_v in rgb_values:
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p_idx = rgb_v.find(u'%')
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if p_idx == -1:
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# base 10 value
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try:
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int_v = int(rgb_v)
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if int_v > 255:
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raise ValueError(u"value exceed 255")
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int_values.append(int_v)
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except ValueError:
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log.warning(u"invalid int: {}".format(rgb_v))
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int_values.append(0)
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else:
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# percentage
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try:
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int_v = int(int(rgb_v[:p_idx]) / 100.0 * 255)
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if int_v > 255:
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raise ValueError(u"value exceed 255")
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int_values.append(int_v)
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except ValueError:
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log.warning(u"invalid percent value: {}".format(rgb_v))
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int_values.append(0)
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str_value = u''.join([u"{:02x}".format(v) for v in int_values])
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elif raw_value.startswith(u'hsl'):
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log.warning(u"hue-saturation-lightness not handled yet") # TODO
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str_value = DEFAULT
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else:
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try:
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str_value = CSS_COLORS[raw_value]
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except KeyError:
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log.warning(u"unrecognised format: {}".format(raw_value))
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str_value = DEFAULT
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if as_string:
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return str_value
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else:
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return tuple([int(str_value[i]+str_value[i+1], 16) for i in xrange(0, len(str_value), 2)])
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