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#------------------------------------------------------------------------------
# Copyright (c) 2013-2025, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
#------------------------------------------------------------------------------
""" A utility module for dealing with CSS3 color strings.
"""
from colorsys import hls_to_rgb
import re
from atom.api import Coerced
from .colorext import Color
#: Regex sub-expressions used for building more complex expression.
_int = r'\s*((?:\+|\-)?[0-9]+)\s*'
_real = r'\s*((?:\+|\-)?[0-9]*(?:\.[0-9]+)?)\s*'
_perc = r'\s*((?:\+|\-)?[0-9]*(?:\.[0-9]+)?)%\s*'
#: Regular expressions used by the parsing routines.
_HEX_RE = re.compile(r'^#([A-Fa-f0-9]{3}|[A-Fa-f0-9]{6})$', re.UNICODE)
_HEXA_RE = re.compile(r'^#([A-Fa-f0-9]{4}|[A-Fa-f0-9]{8})$', re.UNICODE)
_RGB_NUM_RE = re.compile(r'^rgb\(%s,%s,%s\)$' % (_int, _int, _int), re.UNICODE)
_RGB_PER_RE = re.compile(r'^rgb\(%s,%s,%s\)$' % (_perc, _perc, _perc), re.UNICODE)
_RGBA_NUM_RE = re.compile(r'^rgba\(%s,%s,%s,%s\)$' % (_int, _int, _int, _real), re.UNICODE)
_RGBA_PER_RE = re.compile(r'^rgba\(%s,%s,%s,%s\)$' % (_perc, _perc, _perc, _real), re.UNICODE)
_HSL_RE = re.compile(r'^hsl\(%s,%s,%s\)$' % (_real, _perc, _perc), re.UNICODE)
_HSLA_RE = re.compile(r'^hsla\(%s,%s,%s,%s\)$' % (_real, _perc, _perc, _real), re.UNICODE)
#: A table of all 147 named SVG colors supported by CSS3.
SVG_COLORS = {
'aliceblue': Color(240, 248, 255),
'antiquewhite': Color(250, 235, 215),
'aqua': Color(0, 255, 255),
'aquamarine': Color(127, 255, 212),
'azure': Color(240, 255, 255),
'beige': Color(245, 245, 220),
'bisque': Color(255, 228, 196),
'black': Color(0, 0, 0),
'blanchedalmond': Color(255, 235, 205),
'blue': Color(0, 0, 255),
'blueviolet': Color(138, 43, 226),
'brown': Color(165, 42, 42),
'burlywood': Color(222, 184, 135),
'cadetblue': Color(95, 158, 160),
'chartreuse': Color(127, 255, 0),
'chocolate': Color(210, 105, 30),
'coral': Color(255, 127, 80),
'cornflowerblue': Color(100, 149, 237),
'cornsilk': Color(255, 248, 220),
'crimson': Color(220, 20, 60),
'cyan': Color(0, 255, 255),
'darkblue': Color(0, 0, 139),
'darkcyan': Color(0, 139, 139),
'darkgoldenrod': Color(184, 134, 11),
'darkgray': Color(169, 169, 169),
'darkgreen': Color(0, 100, 0),
'darkgrey': Color(169, 169, 169),
'darkkhaki': Color(189, 183, 107),
'darkmagenta': Color(139, 0, 139),
'darkolivegreen': Color(85, 107, 47),
'darkorange': Color(255, 140, 0),
'darkorchid': Color(153, 50, 204),
'darkred': Color(139, 0, 0),
'darksalmon': Color(233, 150, 122),
'darkseagreen': Color(143, 188, 143),
'darkslateblue': Color(72, 61, 139),
'darkslategray': Color(47, 79, 79),
'darkslategrey': Color(47, 79, 79),
'darkturquoise': Color(0, 206, 209),
'darkviolet': Color(148, 0, 211),
'deeppink': Color(255, 20, 147),
'deepskyblue': Color(0, 191, 255),
'dimgray': Color(105, 105, 105),
'dimgrey': Color(105, 105, 105),
'dodgerblue': Color(30, 144, 255),
'firebrick': Color(178, 34, 34),
'floralwhite': Color(255, 250, 240),
'forestgreen': Color(34, 139, 34),
'fuchsia': Color(255, 0, 255),
'gainsboro': Color(220, 220, 220),
'ghostwhite': Color(248, 248, 255),
'gold': Color(255, 215, 0),
'goldenrod': Color(218, 165, 32),
'gray': Color(128, 128, 128),
'grey': Color(128, 128, 128),
'green': Color(0, 128, 0),
'greenyellow': Color(173, 255, 47),
'honeydew': Color(240, 255, 240),
'hotpink': Color(255, 105, 180),
'indianred': Color(205, 92, 92),
'indigo': Color(75, 0, 130),
'ivory': Color(255, 255, 240),
'khaki': Color(240, 230, 140),
'lavender': Color(230, 230, 250),
'lavenderblush': Color(255, 240, 245),
'lawngreen': Color(124, 252, 0),
'lemonchiffon': Color(255, 250, 205),
'lightblue': Color(173, 216, 230),
'lightcoral': Color(240, 128, 128),
'lightcyan': Color(224, 255, 255),
'lightgoldenrodyellow': Color(250, 250, 210),
'lightgray': Color(211, 211, 211),
'lightgreen': Color(144, 238, 144),
'lightgrey': Color(211, 211, 211),
'lightpink': Color(255, 182, 193),
'lightsalmon': Color(255, 160, 122),
'lightseagreen': Color(32, 178, 170),
'lightskyblue': Color(135, 206, 250),
'lightslategray': Color(119, 136, 153),
'lightslategrey': Color(119, 136, 153),
'lightsteelblue': Color(176, 196, 222),
'lightyellow': Color(255, 255, 224),
'lime': Color(0, 255, 0),
'limegreen': Color(50, 205, 50),
'linen': Color(250, 240, 230),
'magenta': Color(255, 0, 255),
'maroon': Color(128, 0, 0),
'mediumaquamarine': Color(102, 205, 170),
'mediumblue': Color(0, 0, 205),
'mediumorchid': Color(186, 85, 211),
'mediumpurple': Color(147, 112, 219),
'mediumseagreen': Color(60, 179, 113),
'mediumslateblue': Color(123, 104, 238),
'mediumspringgreen': Color(0, 250, 154),
'mediumturquoise': Color(72, 209, 204),
'mediumvioletred': Color(199, 21, 133),
'midnightblue': Color(25, 25, 112),
'mintcream': Color(245, 255, 250),
'mistyrose': Color(255, 228, 225),
'moccasin': Color(255, 228, 181),
'navajowhite': Color(255, 222, 173),
'navy': Color(0, 0, 128),
'oldlace': Color(253, 245, 230),
'olive': Color(128, 128, 0),
'olivedrab': Color(107, 142, 35),
'orange': Color(255, 165, 0),
'orangered': Color(255, 69, 0),
'orchid': Color(218, 112, 214),
'palegoldenrod': Color(238, 232, 170),
'palegreen': Color(152, 251, 152),
'paleturquoise': Color(175, 238, 238),
'palevioletred': Color(219, 112, 147),
'papayawhip': Color(255, 239, 213),
'peachpuff': Color(255, 218, 185),
'peru': Color(205, 133, 63),
'pink': Color(255, 192, 203),
'plum': Color(221, 160, 221),
'powderblue': Color(176, 224, 230),
'purple': Color(128, 0, 128),
'red': Color(255, 0, 0),
'rosybrown': Color(188, 143, 143),
'royalblue': Color(65, 105, 225),
'saddlebrown': Color(139, 69, 19),
'salmon': Color(250, 128, 114),
'sandybrown': Color(244, 164, 96),
'seagreen': Color(46, 139, 87),
'seashell': Color(255, 245, 238),
'sienna': Color(160, 82, 45),
'silver': Color(192, 192, 192),
'skyblue': Color(135, 206, 235),
'slateblue': Color(106, 90, 205),
'slategray': Color(112, 128, 144),
'slategrey': Color(112, 128, 144),
'snow': Color(255, 250, 250),
'springgreen': Color(0, 255, 127),
'steelblue': Color(70, 130, 180),
'tan': Color(210, 180, 140),
'teal': Color(0, 128, 128),
'thistle': Color(216, 191, 216),
'tomato': Color(255, 99, 71),
'turquoise': Color(64, 224, 208),
'violet': Color(238, 130, 238),
'wheat': Color(245, 222, 179),
'white': Color(255, 255, 255),
'whitesmoke': Color(245, 245, 245),
'yellow': Color(255, 255, 0),
'yellowgreen': Color(154, 205, 50),
}
def _parse_hex_color(color):
""" Parse a CSS color string which starts with the '#' character.
"""
int_ = int
match = _HEX_RE.match(color)
if match is not None:
hex_str = match.group(1)
if len(hex_str) == 3:
r = int_(hex_str[0], 16)
r |= (r << 4)
g = int_(hex_str[1], 16)
g |= (g << 4)
b = int_(hex_str[2], 16)
b |= (b << 4)
else:
r = int_(hex_str[:2], 16)
g = int_(hex_str[2:4], 16)
b = int_(hex_str[4:6], 16)
return Color(r, g, b, 255)
match = _HEXA_RE.match(color)
if match is not None:
hex_str = match.group(1)
if len(hex_str) == 4:
r = int_(hex_str[0], 16)
r |= (r << 4)
g = int_(hex_str[1], 16)
g |= (g << 4)
b = int_(hex_str[2], 16)
b |= (b << 4)
a = int_(hex_str[3], 16)
a |= (a << 4)
else:
r = int_(hex_str[:2], 16)
g = int_(hex_str[2:4], 16)
b = int_(hex_str[4:6], 16)
a = int_(hex_str[6:8], 16)
return Color(r, g, b, a)
def _parse_rgb_color(color):
""" Parse a CSS color string which starts with the 'r' character.
"""
int_ = int
min_ = min
max_ = max
match = _RGB_NUM_RE.match(color)
if match is not None:
rs, gs, bs = match.groups()
r = max_(0, min_(255, int_(rs)))
g = max_(0, min_(255, int_(gs)))
b = max_(0, min_(255, int_(bs)))
return Color(r, g, b, 255)
float_ = float
match = _RGB_PER_RE.match(color)
if match is not None:
rs, gs, bs = match.groups()
r = max_(0.0, min_(100.0, float_(rs))) / 100.0
g = max_(0.0, min_(100.0, float_(gs))) / 100.0
b = max_(0.0, min_(100.0, float_(bs))) / 100.0
r = int_(255 * r)
g = int_(255 * g)
b = int_(255 * b)
return Color(r, g, b, 255)
match = _RGBA_NUM_RE.match(color)
if match is not None:
rs, gs, bs, as_ = match.groups()
r = max_(0, min_(255, int_(rs)))
g = max_(0, min_(255, int_(gs)))
b = max_(0, min_(255, int_(bs)))
a = max_(0.0, min_(1.0, float_(as_)))
a = int_(255 * a)
return Color(r, g, b, a)
match = _RGBA_PER_RE.match(color)
if match is not None:
rs, gs, bs, as_ = match.groups()
r = max_(0.0, min_(100.0, float_(rs))) / 100.0
g = max_(0.0, min_(100.0, float_(gs))) / 100.0
b = max_(0.0, min_(100.0, float_(bs))) / 100.0
a = max_(0.0, min_(1.0, float_(as_)))
r = int_(255 * r)
g = int_(255 * g)
b = int_(255 * b)
a = int_(255 * a)
return Color(r, g, b, a)
def _parse_hsl_color(color):
""" Parse a CSS color string that starts with the 'h' character.
"""
float_ = float
int_ = int
min_ = min
max_ = max
match = _HSL_RE.match(color)
if match is not None:
hs, ss, ls = match.groups()
h = ((float_(hs) % 360.0 + 360.0) % 360.0) / 360.0
s = max_(0.0, min_(100.0, float_(ss))) / 100.0
l = max_(0.0, min_(100.0, float_(ls))) / 100.0
r, g, b = hls_to_rgb(h, l, s)
r = int_(255 * r)
g = int_(255 * g)
b = int_(255 * b)
return Color(r, g, b, 255)
match = _HSLA_RE.match(color)
if match is not None:
hs, ss, ls, as_ = match.groups()
h = ((float_(hs) % 360.0 + 360.0) % 360.0) / 360.0
s = max_(0.0, min_(100.0, float_(ss))) / 100.0
l = max_(0.0, min_(100.0, float_(ls))) / 100.0
a = max_(0.0, min_(1.0, float_(as_)))
r, g, b = hls_to_rgb(h, l, s)
r = int_(255 * r)
g = int_(255 * g)
b = int_(255 * b)
a = int_(255 * a)
return Color(r, g, b, a)
#: A dispatch table of color parser functions.
_COLOR_PARSERS = {
'#': _parse_hex_color,
'r': _parse_rgb_color,
'h': _parse_hsl_color,
}
def parse_color(color):
""" Parse a CSS3 color string into a tuple of RGBA values.
Parameters
----------
color : string
A CSS3 string representation of the color.
Returns
-------
result : Color or None
A color object representing the parsed color. If the string
is invalid, None will be returned.
"""
if color in SVG_COLORS:
return SVG_COLORS[color]
color = color.strip()
if color:
key = color[0]
if key in _COLOR_PARSERS:
return _COLOR_PARSERS[key](color)
def coerce_color(color):
""" The coercing function for the ColorMember.
"""
if isinstance(color, str):
return parse_color(color)
class ColorMember(Coerced):
""" An Atom member class which coerces a value to a color.
A color member can be set to a Color, a string, or None. A string
color will be parsed into a Color object. If the parsing fails,
the color will be None.
"""
__slots__ = ()
def __init__(self, default=None, factory=None):
""" Initialize a ColorMember.
default : Color, string, or None, optional
The default color to use for the member.
factory : callable, optional
An optional callable which takes no arguments and returns
the default value for the member. If this is provided, it
will override any value passed as 'default'.
Notes
-----
When providing a default color value, prefer using a Color
object or a named color string as these color objects will be
shared among all instances of the class. Using a color string
which must be parsed will result in a new Color object being
created for each class instance.
"""
if factory is None:
factory = lambda: default
kind = (Color, type(None))
sup = super(ColorMember, self)
sup.__init__(kind, factory=factory, coercer=coerce_color)
|
