/usr/lib/python3/dist-packages/lesscpy/lessc/color.py is in python3-lesscpy 0.13.0+ds-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 | # -*- coding: utf8 -*-
"""
.. module:: lesscpy.lessc.color
:synopsis: Lesscpy Color functions
Copyright (c)
See LICENSE for details.
.. moduleauthor:: Johann T. Mariusson <jtm@robot.is>
"""
import operator
import colorsys
import re
import six
from . import utility
from lesscpy.lib import colors
class Color():
def process(self, expression):
""" Process color expression
args:
expression (tuple): color expression
returns:
str
"""
a, o, b = expression
c1 = self._hextorgb(a)
c2 = self._hextorgb(b)
r = ['#']
for i in range(3):
v = self.operate(c1[i], c2[i], o)
if v > 0xff:
v = 0xff
if v < 0:
v = 0
r.append("%02x" % int(v))
return ''.join(r)
def operate(self, left, right, operation):
""" Do operation on colors
args:
left (str): left side
right (str): right side
operation (str): Operation
returns:
str
"""
operation = {
'+': operator.add,
'-': operator.sub,
'*': operator.mul,
'/': operator.truediv
}.get(operation)
return operation(left, right)
def rgb(self, *args):
""" Translate rgb(...) to color string
raises:
ValueError
returns:
str
"""
if len(args) == 4:
args = args[:3]
if len(args) == 3:
try:
return self._rgbatohex(list(map(int, args)))
except ValueError:
if all((a for a in args
if a[-1] == '%'
and 100 >= int(a[:-1]) >= 0)):
return self._rgbatohex([int(a[:-1]) * 255 / 100.0
for a in args])
raise ValueError('Illegal color values')
def rgba(self, *args):
""" Translate rgba(...) to color string
raises:
ValueError
returns:
str
"""
if len(args) == 4:
try:
falpha = float(list(args)[3])
if falpha > 1:
args = args[:3]
if falpha == 0:
values = self._rgbatohex_raw(list(map(int, args)))
return "rgba(%s)" % ','.join([str(a) for a in values])
return self._rgbatohex(list(map(int, args)))
except ValueError:
if all((a for a in args
if a[-1] == '%'
and 100 >= int(a[:-1]) >= 0)):
alpha = list(args)[3]
if alpha[-1] == '%' and float(alpha[:-1]) == 0:
values = self._rgbatohex_raw([int(a[:-1]) * 255 / 100.0
for a in args])
return "rgba(%s)" % ','.join([str(a) for a in values])
return self._rgbatohex([int(a[:-1]) * 255 / 100.0
for a in args])
raise ValueError('Illegal color values')
def argb(self, *args):
""" Translate argb(...) to color string
Creates a hex representation of a color in #AARRGGBB format (NOT
#RRGGBBAA!). This format is used in Internet Explorer, and .NET
and Android development.
raises:
ValueError
returns:
str
"""
if len(args) == 1 and type(args[0]) is str:
match = re.match(r'rgba\((.*)\)', args[0])
if match:
# NOTE(saschpe): Evil hack to cope with rgba(.., .., .., 0.5) passed through untransformed
rgb = re.sub(r'\s+', '', match.group(1)).split(',')
else:
rgb = list(self._hextorgb(args[0]))
else:
rgb = list(args)
if len(rgb) == 3:
return self._rgbatohex([255] + list(map(int, rgb)))
elif len(rgb) == 4:
rgb = [rgb.pop()] + rgb # Move Alpha to front
try:
fval = float(list(rgb)[0])
if fval > 1:
rgb = [255] + rgb[1:] # Clip invalid integer/float values
elif 1 >= fval >= 0:
rgb = [fval * 256] + rgb[1:] # Convert 0-1 to 0-255 range for _rgbatohex
else:
rgb = [0] + rgb[1:] # Clip lower bound
return self._rgbatohex(list(map(int, rgb)))
except ValueError:
if all((a for a in rgb
if a[-1] == '%'
and 100 >= int(a[:-1]) >= 0)):
return self._rgbatohex([int(a[:-1]) * 255 / 100.0
for a in rgb])
raise ValueError('Illegal color values')
def hsl(self, *args):
""" Translate hsl(...) to color string
raises:
ValueError
returns:
str
"""
if len(args) == 4:
return self.hsla(*args)
elif len(args) == 3:
h, s, l = args
rgb = colorsys.hls_to_rgb(int(h) / 360.0, utility.pc_or_float(l), utility.pc_or_float(s))
color = (utility.convergent_round(c * 255) for c in rgb)
return self._rgbatohex(color)
raise ValueError('Illegal color values')
def hsla(self, *args):
""" Translate hsla(...) to color string
raises:
ValueError
returns:
str
"""
if len(args) == 4:
h, s, l, a = args
rgb = colorsys.hls_to_rgb(int(h) / 360.0, utility.pc_or_float(l), utility.pc_or_float(s))
color = [float(utility.convergent_round(c * 255)) for c in rgb]
color.append(utility.pc_or_float(a))
return "rgba(%s,%s,%s,%s)" % tuple(color)
raise ValueError('Illegal color values')
def hue(self, color, *args):
""" Return the hue value of a color
args:
color (str): color
raises:
ValueError
returns:
float
"""
if color:
h, l, s = self._hextohls(color)
return utility.convergent_round(h * 360.0, 3)
raise ValueError('Illegal color values')
def saturation(self, color, *args):
""" Return the saturation value of a color
args:
color (str): color
raises:
ValueError
returns:
float
"""
if color:
h, l, s = self._hextohls(color)
return s * 100.0
raise ValueError('Illegal color values')
def lightness(self, color, *args):
""" Return the lightness value of a color
args:
color (str): color
raises:
ValueError
returns:
float
"""
if color:
h, l, s = self._hextohls(color)
return l * 100.0
raise ValueError('Illegal color values')
def opacity(self, *args):
"""
"""
pass
def lighten(self, color, diff, *args):
""" Lighten a color
args:
color (str): color
diff (str): percentage
returns:
str
"""
if color and diff:
return self._ophsl(color, diff, 1, operator.add)
raise ValueError('Illegal color values')
def darken(self, color, diff, *args):
""" Darken a color
args:
color (str): color
diff (str): percentage
returns:
str
"""
if color and diff:
return self._ophsl(color, diff, 1, operator.sub)
raise ValueError('Illegal color values')
def saturate(self, color, diff, *args):
""" Saturate a color
args:
color (str): color
diff (str): percentage
returns:
str
"""
if color and diff:
return self._ophsl(color, diff, 2, operator.add)
raise ValueError('Illegal color values')
def desaturate(self, color, diff, *args):
""" Desaturate a color
args:
color (str): color
diff (str): percentage
returns:
str
"""
if color and diff:
return self._ophsl(color, diff, 2, operator.sub)
raise ValueError('Illegal color values')
def _clamp(self, value):
# Clamp value
return min(1, max(0, value))
def greyscale(self, color, *args):
""" Simply 100% desaturate.
args:
color (str): color
returns:
str
"""
if color:
return self.desaturate(color, 100.0)
raise ValueError('Illegal color values')
def grayscale(self, color, *args):
"""Wrapper for greyscale, other spelling
"""
return self.greyscale(color, *args)
def spin(self, color, degree, *args):
""" Spin color by degree. (Increase / decrease hue)
args:
color (str): color
degree (str): percentage
raises:
ValueError
returns:
str
"""
if color and degree:
if isinstance(degree, six.string_types):
degree = float(degree.strip('%'))
h, l, s = self._hextohls(color)
h = ((h * 360.0) + degree) % 360.0
h = 360.0 + h if h < 0 else h
rgb = colorsys.hls_to_rgb(h / 360.0, l, s)
color = (utility.convergent_round(c * 255) for c in rgb)
return self._rgbatohex(color)
raise ValueError('Illegal color values')
def mix(self, color1, color2, weight=50, *args):
"""This algorithm factors in both the user-provided weight
and the difference between the alpha values of the two colors
to decide how to perform the weighted average of the two RGB values.
It works by first normalizing both parameters to be within [-1, 1],
where 1 indicates "only use color1", -1 indicates "only use color 0",
and all values in between indicated a proportionately weighted average.
Once we have the normalized variables w and a,
we apply the formula (w + a)/(1 + w*a)
to get the combined weight (in [-1, 1]) of color1.
This formula has two especially nice properties:
* When either w or a are -1 or 1, the combined weight is also that number
(cases where w * a == -1 are undefined, and handled as a special case).
* When a is 0, the combined weight is w, and vice versa
Finally, the weight of color1 is renormalized to be within [0, 1]
and the weight of color2 is given by 1 minus the weight of color1.
Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
http://sass-lang.com
args:
color1 (str): first color
color2 (str): second color
weight (int/str): weight
raises:
ValueError
returns:
str
"""
if color1 and color2:
if isinstance(weight, six.string_types):
weight = float(weight.strip('%'))
weight = ((weight / 100.0) * 2) - 1
rgb1 = self._hextorgb(color1)
rgb2 = self._hextorgb(color2)
alpha = 0
w1 = (((weight if weight * alpha == -1
else weight + alpha) / (1 + weight * alpha)) + 1)
w1 = w1 / 2.0
w2 = 1 - w1
rgb = [
rgb1[0] * w1 + rgb2[0] * w2,
rgb1[1] * w1 + rgb2[1] * w2,
rgb1[2] * w1 + rgb2[2] * w2,
]
return self._rgbatohex(rgb)
raise ValueError('Illegal color values')
def fmt(self, color):
""" Format CSS Hex color code.
uppercase becomes lowercase, 3 digit codes expand to 6 digit.
args:
color (str): color
raises:
ValueError
returns:
str
"""
if utility.is_color(color):
color = color.lower().strip('#')
if len(color) in [3, 4]:
color = ''.join([c * 2 for c in color])
return '#%s' % color
raise ValueError('Cannot format non-color')
def _rgbatohex_raw(self, rgba):
values = ["%x" % int(v) for v in
[0xff if h > 0xff else 0 if h < 0 else h for h in rgba]]
return values
def _rgbatohex(self, rgba):
return '#%s' % ''.join(["%02x" % int(v) for v in
[0xff
if h > 0xff else
0 if h < 0 else h
for h in rgba]
])
def _hextorgb(self, hex):
if hex.lower() in colors.lessColors:
hex = colors.lessColors[hex.lower()]
hex = hex.strip()
if hex[0] == '#':
hex = hex.strip('#').strip(';')
if len(hex) == 3:
hex = [c * 2 for c in hex]
else:
hex = [hex[i:i + 2] for i in range(0, len(hex), 2)]
return tuple(int(c, 16) for c in hex)
try:
return [int(hex, 16)] * 3
except:
return [float(hex)] * 3
def _hextohls(self, hex):
rgb = self._hextorgb(hex)
return colorsys.rgb_to_hls(*[c / 255.0 for c in rgb])
def _ophsl(self, color, diff, idx, operation):
if isinstance(diff, six.string_types):
diff = float(diff.strip('%'))
hls = list(self._hextohls(color))
hls[idx] = self._clamp(operation(hls[idx], diff / 100.0))
rgb = colorsys.hls_to_rgb(*hls)
color = (utility.away_from_zero_round(c * 255) for c in rgb)
return self._rgbatohex(color)
|