# (C) Copyright 2005-2022 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
"""
Parsing for CSS colour values.
Supported formats:
* hex literal short: #fff
* hex literal long: #fafafa
* rgb bytes: rgb(255,100,0)
* rgb percent: rgb(100%,100%,0%)
* named color: black
"""
import string
import urllib.parse as urlparse
from pyparsing import (
nums,
Literal,
Optional,
oneOf,
Group,
StringEnd,
Combine,
Word,
alphas,
hexnums,
)
from enable.savage.svg.pathdata import number, sign
number = number.copy()
integerConstant = Word(nums + "+-").setParseAction(lambda t: int(t[0]))
# rgb format parser
comma = Literal(",").suppress()
[docs]def clampColourByte(val):
val = int(val)
return min(max(0, val), 255)
[docs]def clampColourPerc(val):
val = float(val)
return min(max(0, val), 100)
[docs]def parseColorPerc(token):
val = token[0]
val = clampColourPerc(val)
# normalize to bytes
return int(255 * (val / 100.0))
colorByte = Optional(sign) + integerConstant.setParseAction(
lambda t: clampColourByte(t[0])
)
colorPerc = number.setParseAction(parseColorPerc) + Literal("%").suppress()
rgb = (
Literal("rgb(").setParseAction(lambda t: "RGB")
+ (
# integer constants, ie 255,255,255
Group(colorByte + comma + colorByte + comma + colorByte)
^
# percentage values, ie 100%, 50%
Group(colorPerc + comma + colorPerc + comma + colorPerc)
)
+ Literal(")").suppress()
+ StringEnd()
)
[docs]def parseShortHex(t):
return tuple(int(x * 2, 16) for x in t[0])
doubleHex = Word(hexnums, exact=2).setParseAction(lambda t: int(t[0], 16))
hexLiteral = (
Literal("#").setParseAction(lambda t: "RGB")
+ (
Group(doubleHex + doubleHex + doubleHex)
| Word(hexnums, exact=3).setParseAction(parseShortHex)
)
+ StringEnd()
)
[docs]def parseNamedColour(t):
try:
return ["RGB", NamedColours[t[0].lower()]]
except KeyError:
return ["RGB", (0, 0, 0)]
namedColour = Word(alphas).setParseAction(parseNamedColour)
colourValue = rgb | hexLiteral | namedColour
# constants
NamedColours = {
# ~ #html named colours
# ~ "black":(0,0,0),
# ~ "silver": (0xc0, 0xc0, 0xc0, 255),
# ~ "gray": (0x80, 0x80, 0x80),
# ~ "white":(255,255,255),
# ~ "maroon":(0x80, 0, 0),
# ~ "red":(0xff, 0, 0),
# ~ "purple":(0x80, 0, 0x80),
# ~ "fuchsia":(0xff, 0, 0xff),
# ~ "green": (0, 0x80, 0),
# ~ "lime": (0, 0xff, 0),
# ~ "olive": (0x80, 0x80, 00),
# ~ "yellow":(0xff, 0xff, 00),
# ~ "navy": (0, 0, 0x80),
# ~ "blue": (0, 0, 0xff),
# ~ "teal": (0, 0x80, 0x80),
# ~ "aqua": (0, 0xff, 0xff),
# expanded named colors from SVG spc
"aliceblue": (240, 248, 255),
"antiquewhite": (250, 235, 215),
"aqua": (0, 255, 255),
"aquamarine": (127, 255, 212),
"azure": (240, 255, 255),
"beige": (245, 245, 220),
"bisque": (255, 228, 196),
"black": (0, 0, 0),
"blanchedalmond": (255, 235, 205),
"blue": (0, 0, 255),
"blueviolet": (138, 43, 226),
"brown": (165, 42, 42),
"burlywood": (222, 184, 135),
"cadetblue": (95, 158, 160),
"chartreuse": (127, 255, 0),
"chocolate": (210, 105, 30),
"coral": (255, 127, 80),
"cornflowerblue": (100, 149, 237),
"cornsilk": (255, 248, 220),
"crimson": (220, 20, 60),
"cyan": (0, 255, 255),
"darkblue": (0, 0, 139),
"darkcyan": (0, 139, 139),
"darkgoldenrod": (184, 134, 11),
"darkgray": (169, 169, 169),
"darkgreen": (0, 100, 0),
"darkgrey": (169, 169, 169),
"darkkhaki": (189, 183, 107),
"darkmagenta": (139, 0, 139),
"darkolivegreen": (85, 107, 47),
"darkorange": (255, 140, 0),
"darkorchid": (153, 50, 204),
"darkred": (139, 0, 0),
"darksalmon": (233, 150, 122),
"darkseagreen": (143, 188, 143),
"darkslateblue": (72, 61, 139),
"darkslategray": (47, 79, 79),
"darkslategrey": (47, 79, 79),
"darkturquoise": (0, 206, 209),
"darkviolet": (148, 0, 211),
"deeppink": (255, 20, 147),
"deepskyblue": (0, 191, 255),
"dimgray": (105, 105, 105),
"dimgrey": (105, 105, 105),
"dodgerblue": (30, 144, 255),
"firebrick": (178, 34, 34),
"floralwhite": (255, 250, 240),
"forestgreen": (34, 139, 34),
"fuchsia": (255, 0, 255),
"gainsboro": (220, 220, 220),
"ghostwhite": (248, 248, 255),
"gold": (255, 215, 0),
"goldenrod": (218, 165, 32),
"gray": (128, 128, 128),
"grey": (128, 128, 128),
"green": (0, 128, 0),
"greenyellow": (173, 255, 47),
"honeydew": (240, 255, 240),
"hotpink": (255, 105, 180),
"indianred": (205, 92, 92),
"indigo": (75, 0, 130),
"ivory": (255, 255, 240),
"khaki": (240, 230, 140),
"lavender": (230, 230, 250),
"lavenderblush": (255, 240, 245),
"lawngreen": (124, 252, 0),
"lemonchiffon": (255, 250, 205),
"lightblue": (173, 216, 230),
"lightcoral": (240, 128, 128),
"lightcyan": (224, 255, 255),
"lightgoldenrodyellow": (250, 250, 210),
"lightgray": (211, 211, 211),
"lightgreen": (144, 238, 144),
"lightgrey": (211, 211, 211),
"lightpink": (255, 182, 193),
"lightsalmon": (255, 160, 122),
"lightseagreen": (32, 178, 170),
"lightskyblue": (135, 206, 250),
"lightslategray": (119, 136, 153),
"lightslategrey": (119, 136, 153),
"lightsteelblue": (176, 196, 222),
"lightyellow": (255, 255, 224),
"lime": (0, 255, 0),
"limegreen": (50, 205, 50),
"linen": (250, 240, 230),
"magenta": (255, 0, 255),
"maroon": (128, 0, 0),
"mediumaquamarine": (102, 205, 170),
"mediumblue": (0, 0, 205),
"mediumorchid": (186, 85, 211),
"mediumpurple": (147, 112, 219),
"mediumseagreen": (60, 179, 113),
"mediumslateblue": (123, 104, 238),
"mediumspringgreen": (0, 250, 154),
"mediumturquoise": (72, 209, 204),
"mediumvioletred": (199, 21, 133),
"midnightblue": (25, 25, 112),
"mintcream": (245, 255, 250),
"mistyrose": (255, 228, 225),
"moccasin": (255, 228, 181),
"navajowhite": (255, 222, 173),
"navy": (0, 0, 128),
"oldlace": (253, 245, 230),
"olive": (128, 128, 0),
"olivedrab": (107, 142, 35),
"orange": (255, 165, 0),
"orangered": (255, 69, 0),
"orchid": (218, 112, 214),
"palegoldenrod": (238, 232, 170),
"palegreen": (152, 251, 152),
"paleturquoise": (175, 238, 238),
"palevioletred": (219, 112, 147),
"papayawhip": (255, 239, 213),
"peachpuff": (255, 218, 185),
"peru": (205, 133, 63),
"pink": (255, 192, 203),
"plum": (221, 160, 221),
"powderblue": (176, 224, 230),
"purple": (128, 0, 128),
"red": (255, 0, 0),
"rosybrown": (188, 143, 143),
"royalblue": (65, 105, 225),
"saddlebrown": (139, 69, 19),
"salmon": (250, 128, 114),
"sandybrown": (244, 164, 96),
"seagreen": (46, 139, 87),
"seashell": (255, 245, 238),
"sienna": (160, 82, 45),
"silver": (192, 192, 192),
"skyblue": (135, 206, 235),
"slateblue": (106, 90, 205),
"slategray": (112, 128, 144),
"slategrey": (112, 128, 144),
"snow": (255, 250, 250),
"springgreen": (0, 255, 127),
"steelblue": (70, 130, 180),
"tan": (210, 180, 140),
"teal": (0, 128, 128),
"thistle": (216, 191, 216),
"tomato": (255, 99, 71),
"turquoise": (64, 224, 208),
"violet": (238, 130, 238),
"wheat": (245, 222, 179),
"white": (255, 255, 255),
"whitesmoke": (245, 245, 245),
"yellow": (255, 255, 0),
"yellowgreen": (154, 205, 50),
}