Mercurial > libervia-backend
view libervia/frontends/tools/css_color.py @ 4116:23fa52acf72c
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author | Goffi <goffi@goffi.org> |
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date | Mon, 21 Aug 2023 15:19:45 +0200 |
parents | 26b7ed2817da |
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#!/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) ] )