Mercurial > libervia-backend
diff libervia/frontends/tools/css_color.py @ 4074:26b7ed2817da
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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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libervia/frontends/tools/css_color.py Fri Jun 02 14:12:38 2023 +0200 @@ -0,0 +1,245 @@ +#!/usr/bin/env python3 + + +# CSS color parsing +# Copyright (C) 2009-2021 Jérome-Poisson + +# 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/>. + +from libervia.backend.core.log import getLogger + +log = getLogger(__name__) + + +CSS_COLORS = { + "black": "000000", + "silver": "c0c0c0", + "gray": "808080", + "white": "ffffff", + "maroon": "800000", + "red": "ff0000", + "purple": "800080", + "fuchsia": "ff00ff", + "green": "008000", + "lime": "00ff00", + "olive": "808000", + "yellow": "ffff00", + "navy": "000080", + "blue": "0000ff", + "teal": "008080", + "aqua": "00ffff", + "orange": "ffa500", + "aliceblue": "f0f8ff", + "antiquewhite": "faebd7", + "aquamarine": "7fffd4", + "azure": "f0ffff", + "beige": "f5f5dc", + "bisque": "ffe4c4", + "blanchedalmond": "ffebcd", + "blueviolet": "8a2be2", + "brown": "a52a2a", + "burlywood": "deb887", + "cadetblue": "5f9ea0", + "chartreuse": "7fff00", + "chocolate": "d2691e", + "coral": "ff7f50", + "cornflowerblue": "6495ed", + "cornsilk": "fff8dc", + "crimson": "dc143c", + "darkblue": "00008b", + "darkcyan": "008b8b", + "darkgoldenrod": "b8860b", + "darkgray": "a9a9a9", + "darkgreen": "006400", + "darkgrey": "a9a9a9", + "darkkhaki": "bdb76b", + "darkmagenta": "8b008b", + "darkolivegreen": "556b2f", + "darkorange": "ff8c00", + "darkorchid": "9932cc", + "darkred": "8b0000", + "darksalmon": "e9967a", + "darkseagreen": "8fbc8f", + "darkslateblue": "483d8b", + "darkslategray": "2f4f4f", + "darkslategrey": "2f4f4f", + "darkturquoise": "00ced1", + "darkviolet": "9400d3", + "deeppink": "ff1493", + "deepskyblue": "00bfff", + "dimgray": "696969", + "dimgrey": "696969", + "dodgerblue": "1e90ff", + "firebrick": "b22222", + "floralwhite": "fffaf0", + "forestgreen": "228b22", + "gainsboro": "dcdcdc", + "ghostwhite": "f8f8ff", + "gold": "ffd700", + "goldenrod": "daa520", + "greenyellow": "adff2f", + "grey": "808080", + "honeydew": "f0fff0", + "hotpink": "ff69b4", + "indianred": "cd5c5c", + "indigo": "4b0082", + "ivory": "fffff0", + "khaki": "f0e68c", + "lavender": "e6e6fa", + "lavenderblush": "fff0f5", + "lawngreen": "7cfc00", + "lemonchiffon": "fffacd", + "lightblue": "add8e6", + "lightcoral": "f08080", + "lightcyan": "e0ffff", + "lightgoldenrodyellow": "fafad2", + "lightgray": "d3d3d3", + "lightgreen": "90ee90", + "lightgrey": "d3d3d3", + "lightpink": "ffb6c1", + "lightsalmon": "ffa07a", + "lightseagreen": "20b2aa", + "lightskyblue": "87cefa", + "lightslategray": "778899", + "lightslategrey": "778899", + "lightsteelblue": "b0c4de", + "lightyellow": "ffffe0", + "limegreen": "32cd32", + "linen": "faf0e6", + "mediumaquamarine": "66cdaa", + "mediumblue": "0000cd", + "mediumorchid": "ba55d3", + "mediumpurple": "9370db", + "mediumseagreen": "3cb371", + "mediumslateblue": "7b68ee", + "mediumspringgreen": "00fa9a", + "mediumturquoise": "48d1cc", + "mediumvioletred": "c71585", + "midnightblue": "191970", + "mintcream": "f5fffa", + "mistyrose": "ffe4e1", + "moccasin": "ffe4b5", + "navajowhite": "ffdead", + "oldlace": "fdf5e6", + "olivedrab": "6b8e23", + "orangered": "ff4500", + "orchid": "da70d6", + "palegoldenrod": "eee8aa", + "palegreen": "98fb98", + "paleturquoise": "afeeee", + "palevioletred": "db7093", + "papayawhip": "ffefd5", + "peachpuff": "ffdab9", + "peru": "cd853f", + "pink": "ffc0cb", + "plum": "dda0dd", + "powderblue": "b0e0e6", + "rosybrown": "bc8f8f", + "royalblue": "4169e1", + "saddlebrown": "8b4513", + "salmon": "fa8072", + "sandybrown": "f4a460", + "seagreen": "2e8b57", + "seashell": "fff5ee", + "sienna": "a0522d", + "skyblue": "87ceeb", + "slateblue": "6a5acd", + "slategray": "708090", + "slategrey": "708090", + "snow": "fffafa", + "springgreen": "00ff7f", + "steelblue": "4682b4", + "tan": "d2b48c", + "thistle": "d8bfd8", + "tomato": "ff6347", + "turquoise": "40e0d0", + "violet": "ee82ee", + "wheat": "f5deb3", + "whitesmoke": "f5f5f5", + "yellowgreen": "9acd32", + "rebeccapurple": "663399", +} +DEFAULT = "000000" + + +def parse(raw_value, as_string=True): + """parse CSS color value and return normalised value + + @param raw_value(unicode): CSS value + @param as_string(bool): if True return a string, + else return a tuple of int + @return (unicode, tuple): normalised value + if as_string is True, value is 3 or 4 hex words (e.g. u"ff00aabb") + else value is a 3 or 4 tuple of int (e.g.: (255, 0, 170, 187)). + If present, the 4th value is the alpha channel + If value can't be parsed, a warning message is logged, and DEFAULT is returned + """ + raw_value = raw_value.strip().lower() + if raw_value.startswith("#"): + # we have a hexadecimal value + str_value = raw_value[1:] + if len(raw_value) in (3, 4): + str_value = "".join([2 * v for v in str_value]) + elif raw_value.startswith("rgb"): + left_p = raw_value.find("(") + right_p = raw_value.find(")") + rgb_values = [v.strip() for v in raw_value[left_p + 1 : right_p].split(",")] + expected_len = 4 if raw_value.startswith("rgba") else 3 + if len(rgb_values) != expected_len: + log.warning("incorrect value: {}".format(raw_value)) + str_value = DEFAULT + else: + int_values = [] + for rgb_v in rgb_values: + p_idx = rgb_v.find("%") + if p_idx == -1: + # base 10 value + try: + int_v = int(rgb_v) + if int_v > 255: + raise ValueError("value exceed 255") + int_values.append(int_v) + except ValueError: + log.warning("invalid int: {}".format(rgb_v)) + int_values.append(0) + else: + # percentage + try: + int_v = int(int(rgb_v[:p_idx]) / 100.0 * 255) + if int_v > 255: + raise ValueError("value exceed 255") + int_values.append(int_v) + except ValueError: + log.warning("invalid percent value: {}".format(rgb_v)) + int_values.append(0) + str_value = "".join(["{:02x}".format(v) for v in int_values]) + elif raw_value.startswith("hsl"): + log.warning("hue-saturation-lightness not handled yet") # TODO + str_value = DEFAULT + else: + try: + str_value = CSS_COLORS[raw_value] + except KeyError: + log.warning("unrecognised format: {}".format(raw_value)) + str_value = DEFAULT + + if as_string: + return str_value + else: + return tuple( + [ + int(str_value[i] + str_value[i + 1], 16) + for i in range(0, len(str_value), 2) + ] + )