view sat_frontends/tools/css_color.py @ 3178:98b321234068

plugin aesgcm: use 12 bytes Initialisation Vector: SàT was using 16 bytes IV when sending files withr AES-GCM, due to ChatSecure being only compatible with that. Monal, an other iOS client is only compatible with 12 bytes IV, and ChatSecure has fixed its code to also handle 12 bytes IV, so there is not reason anymore to use 16 bytes, and SàT now uses 12 bytes.
author Goffi <goffi@goffi.org>
date Tue, 18 Feb 2020 18:17:18 +0100
parents 559a625a236b
children be6d91572633
line wrap: on
line source

#!/usr/bin/env python3


# CSS color parsing
# Copyright (C) 2009-2020 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 sat.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)
            ]
        )