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383 lines
12 KiB
Python
383 lines
12 KiB
Python
# coding: utf8
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"""
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tinycss.colors3
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---------------
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Parser for CSS 3 color values
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http://www.w3.org/TR/css3-color/
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This module does not provide anything that integrates in a parser class,
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only functions that parse single tokens from (eg.) a property value.
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:copyright: (c) 2012 by Simon Sapin.
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:license: BSD, see LICENSE for more details.
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"""
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from __future__ import unicode_literals, division
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import collections
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import itertools
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import re
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from .tokenizer import tokenize_grouped
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class RGBA(collections.namedtuple('RGBA', ['red', 'green', 'blue', 'alpha'])):
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"""An RGBA color.
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A tuple of four floats in the 0..1 range: ``(r, g, b, a)``.
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Also has ``red``, ``green``, ``blue`` and ``alpha`` attributes to access
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the same values.
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"""
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def parse_color_string(css_string):
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"""Parse a CSS string as a color value.
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This is a convenience wrapper around :func:`parse_color` in case you
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have a string that is not from a CSS stylesheet.
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:param css_string:
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An unicode string in CSS syntax.
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:returns:
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Same as :func:`parse_color`.
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"""
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tokens = list(tokenize_grouped(css_string.strip()))
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if len(tokens) == 1:
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return parse_color(tokens[0])
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def parse_color(token):
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"""Parse single token as a color value.
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:param token:
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A single :class:`~.token_data.Token` or
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:class:`~.token_data.ContainerToken`, as found eg. in a
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property value.
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:returns:
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* ``None``, if the token is not a valid CSS 3 color value.
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(No exception is raised.)
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* For the *currentColor* keyword: the string ``'currentColor'``
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* Every other values (including keywords, HSL and HSLA) is converted
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to RGBA and returned as an :class:`RGBA` object (a 4-tuple with
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attribute access).
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The alpha channel is clipped to [0, 1], but R, G, or B can be
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out of range (eg. ``rgb(-51, 306, 0)`` is represented as
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``(-.2, 1.2, 0, 1)``.)
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"""
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if token.type == 'IDENT':
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return COLOR_KEYWORDS.get(token.value.lower())
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elif token.type == 'HASH':
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for multiplier, regexp in HASH_REGEXPS:
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match = regexp(token.value)
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if match:
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r, g, b = [int(group * multiplier, 16) / 255
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for group in match.groups()]
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return RGBA(r, g, b, 1.)
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elif token.type == 'FUNCTION':
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args = parse_comma_separated(token.content)
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if args:
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name = token.function_name.lower()
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if name == 'rgb':
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return parse_rgb(args, alpha=1.)
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elif name == 'rgba':
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alpha = parse_alpha(args[3:])
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if alpha is not None:
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return parse_rgb(args[:3], alpha)
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elif name == 'hsl':
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return parse_hsl(args, alpha=1.)
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elif name == 'hsla':
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alpha = parse_alpha(args[3:])
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if alpha is not None:
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return parse_hsl(args[:3], alpha)
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def parse_alpha(args):
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"""
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If args is a list of a single INTEGER or NUMBER token,
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retur its value clipped to the 0..1 range
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Otherwise, return None.
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"""
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if len(args) == 1 and args[0].type in ('NUMBER', 'INTEGER'):
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return min(1, max(0, args[0].value))
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def parse_rgb(args, alpha):
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"""
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If args is a list of 3 INTEGER tokens or 3 PERCENTAGE tokens,
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return RGB values as a tuple of 3 floats in 0..1.
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Otherwise, return None.
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"""
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types = [arg.type for arg in args]
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if types == ['INTEGER', 'INTEGER', 'INTEGER']:
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r, g, b = [arg.value / 255 for arg in args[:3]]
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return RGBA(r, g, b, alpha)
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elif types == ['PERCENTAGE', 'PERCENTAGE', 'PERCENTAGE']:
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r, g, b = [arg.value / 100 for arg in args[:3]]
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return RGBA(r, g, b, alpha)
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def parse_hsl(args, alpha):
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"""
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If args is a list of 1 INTEGER token and 2 PERCENTAGE tokens,
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return RGB values as a tuple of 3 floats in 0..1.
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Otherwise, return None.
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"""
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types = [arg.type for arg in args]
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if types == ['INTEGER', 'PERCENTAGE', 'PERCENTAGE']:
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hsl = [arg.value for arg in args[:3]]
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r, g, b = hsl_to_rgb(*hsl)
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return RGBA(r, g, b, alpha)
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def hsl_to_rgb(hue, saturation, lightness):
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"""
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:param hue: degrees
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:param saturation: percentage
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:param lightness: percentage
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:returns: (r, g, b) as floats in the 0..1 range
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"""
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hue = (hue / 360) % 1
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saturation = min(1, max(0, saturation / 100))
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lightness = min(1, max(0, lightness / 100))
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# Translated from ABC: http://www.w3.org/TR/css3-color/#hsl-color
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def hue_to_rgb(m1, m2, h):
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if h < 0:
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h += 1
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if h > 1:
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h -= 1
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if h * 6 < 1:
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return m1 + (m2 - m1) * h * 6
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if h * 2 < 1:
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return m2
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if h * 3 < 2:
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return m1 + (m2 - m1) * (2 / 3 - h) * 6
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return m1
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if lightness <= 0.5:
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m2 = lightness * (saturation + 1)
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else:
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m2 = lightness + saturation - lightness * saturation
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m1 = lightness * 2 - m2
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return (
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hue_to_rgb(m1, m2, hue + 1 / 3),
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hue_to_rgb(m1, m2, hue),
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hue_to_rgb(m1, m2, hue - 1 / 3),
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)
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def parse_comma_separated(tokens):
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"""Parse a list of tokens (typically the content of a function token)
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as arguments made of a single token each, separated by mandatory commas,
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with optional white space around each argument.
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return the argument list without commas or white space;
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or None if the function token content do not match the description above.
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"""
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tokens = [token for token in tokens if token.type != 'S']
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if not tokens:
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return []
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if len(tokens) % 2 == 1 and all(
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token.type == 'DELIM' and token.value == ','
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for token in tokens[1::2]):
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return tokens[::2]
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HASH_REGEXPS = (
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(2, re.compile('^#([\da-f])([\da-f])([\da-f])$', re.I).match),
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(1, re.compile('^#([\da-f]{2})([\da-f]{2})([\da-f]{2})$', re.I).match),
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)
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# (r, g, b) in 0..255
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BASIC_COLOR_KEYWORDS = [
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('black', (0, 0, 0)),
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('silver', (192, 192, 192)),
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('gray', (128, 128, 128)),
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('white', (255, 255, 255)),
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('maroon', (128, 0, 0)),
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('red', (255, 0, 0)),
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('purple', (128, 0, 128)),
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('fuchsia', (255, 0, 255)),
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('green', (0, 128, 0)),
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('lime', (0, 255, 0)),
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('olive', (128, 128, 0)),
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('yellow', (255, 255, 0)),
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('navy', (0, 0, 128)),
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('blue', (0, 0, 255)),
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('teal', (0, 128, 128)),
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('aqua', (0, 255, 255)),
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]
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# (r, g, b) in 0..255
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EXTENDED_COLOR_KEYWORDS = [
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('aliceblue', (240, 248, 255)),
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('antiquewhite', (250, 235, 215)),
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('aqua', (0, 255, 255)),
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('aquamarine', (127, 255, 212)),
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('azure', (240, 255, 255)),
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('beige', (245, 245, 220)),
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('bisque', (255, 228, 196)),
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('black', (0, 0, 0)),
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('blanchedalmond', (255, 235, 205)),
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('blue', (0, 0, 255)),
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('blueviolet', (138, 43, 226)),
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('brown', (165, 42, 42)),
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('burlywood', (222, 184, 135)),
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('cadetblue', (95, 158, 160)),
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('chartreuse', (127, 255, 0)),
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('chocolate', (210, 105, 30)),
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('coral', (255, 127, 80)),
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('cornflowerblue', (100, 149, 237)),
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('cornsilk', (255, 248, 220)),
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('crimson', (220, 20, 60)),
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('cyan', (0, 255, 255)),
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('darkblue', (0, 0, 139)),
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('darkcyan', (0, 139, 139)),
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('darkgoldenrod', (184, 134, 11)),
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('darkgray', (169, 169, 169)),
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('darkgreen', (0, 100, 0)),
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('darkgrey', (169, 169, 169)),
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('darkkhaki', (189, 183, 107)),
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('darkmagenta', (139, 0, 139)),
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('darkolivegreen', (85, 107, 47)),
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('darkorange', (255, 140, 0)),
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('darkorchid', (153, 50, 204)),
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('darkred', (139, 0, 0)),
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('darksalmon', (233, 150, 122)),
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('darkseagreen', (143, 188, 143)),
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('darkslateblue', (72, 61, 139)),
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('darkslategray', (47, 79, 79)),
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('darkslategrey', (47, 79, 79)),
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('darkturquoise', (0, 206, 209)),
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('darkviolet', (148, 0, 211)),
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('deeppink', (255, 20, 147)),
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('deepskyblue', (0, 191, 255)),
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('dimgray', (105, 105, 105)),
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('dimgrey', (105, 105, 105)),
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('dodgerblue', (30, 144, 255)),
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('firebrick', (178, 34, 34)),
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('floralwhite', (255, 250, 240)),
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('forestgreen', (34, 139, 34)),
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('fuchsia', (255, 0, 255)),
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('gainsboro', (220, 220, 220)),
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('ghostwhite', (248, 248, 255)),
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('gold', (255, 215, 0)),
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('goldenrod', (218, 165, 32)),
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('gray', (128, 128, 128)),
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('green', (0, 128, 0)),
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('greenyellow', (173, 255, 47)),
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('grey', (128, 128, 128)),
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('honeydew', (240, 255, 240)),
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('hotpink', (255, 105, 180)),
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('indianred', (205, 92, 92)),
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('indigo', (75, 0, 130)),
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('ivory', (255, 255, 240)),
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('khaki', (240, 230, 140)),
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('lavender', (230, 230, 250)),
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('lavenderblush', (255, 240, 245)),
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('lawngreen', (124, 252, 0)),
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('lemonchiffon', (255, 250, 205)),
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('lightblue', (173, 216, 230)),
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('lightcoral', (240, 128, 128)),
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('lightcyan', (224, 255, 255)),
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('lightgoldenrodyellow', (250, 250, 210)),
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('lightgray', (211, 211, 211)),
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('lightgreen', (144, 238, 144)),
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('lightgrey', (211, 211, 211)),
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('lightpink', (255, 182, 193)),
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('lightsalmon', (255, 160, 122)),
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('lightseagreen', (32, 178, 170)),
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('lightskyblue', (135, 206, 250)),
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('lightslategray', (119, 136, 153)),
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('lightslategrey', (119, 136, 153)),
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('lightsteelblue', (176, 196, 222)),
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('lightyellow', (255, 255, 224)),
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('lime', (0, 255, 0)),
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('limegreen', (50, 205, 50)),
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('linen', (250, 240, 230)),
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('magenta', (255, 0, 255)),
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('maroon', (128, 0, 0)),
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('mediumaquamarine', (102, 205, 170)),
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('mediumblue', (0, 0, 205)),
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('mediumorchid', (186, 85, 211)),
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('mediumpurple', (147, 112, 219)),
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('mediumseagreen', (60, 179, 113)),
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('mediumslateblue', (123, 104, 238)),
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('mediumspringgreen', (0, 250, 154)),
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('mediumturquoise', (72, 209, 204)),
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('mediumvioletred', (199, 21, 133)),
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('midnightblue', (25, 25, 112)),
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('mintcream', (245, 255, 250)),
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('mistyrose', (255, 228, 225)),
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('moccasin', (255, 228, 181)),
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('navajowhite', (255, 222, 173)),
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('navy', (0, 0, 128)),
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('oldlace', (253, 245, 230)),
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('olive', (128, 128, 0)),
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('olivedrab', (107, 142, 35)),
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('orange', (255, 165, 0)),
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('orangered', (255, 69, 0)),
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('orchid', (218, 112, 214)),
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('palegoldenrod', (238, 232, 170)),
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('palegreen', (152, 251, 152)),
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('paleturquoise', (175, 238, 238)),
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('palevioletred', (219, 112, 147)),
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('papayawhip', (255, 239, 213)),
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('peachpuff', (255, 218, 185)),
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('peru', (205, 133, 63)),
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('pink', (255, 192, 203)),
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('plum', (221, 160, 221)),
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('powderblue', (176, 224, 230)),
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('purple', (128, 0, 128)),
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('red', (255, 0, 0)),
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('rosybrown', (188, 143, 143)),
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('royalblue', (65, 105, 225)),
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('saddlebrown', (139, 69, 19)),
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('salmon', (250, 128, 114)),
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('sandybrown', (244, 164, 96)),
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('seagreen', (46, 139, 87)),
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('seashell', (255, 245, 238)),
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('sienna', (160, 82, 45)),
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('silver', (192, 192, 192)),
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('skyblue', (135, 206, 235)),
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('slateblue', (106, 90, 205)),
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('slategray', (112, 128, 144)),
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('slategrey', (112, 128, 144)),
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('snow', (255, 250, 250)),
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('springgreen', (0, 255, 127)),
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('steelblue', (70, 130, 180)),
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('tan', (210, 180, 140)),
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('teal', (0, 128, 128)),
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('thistle', (216, 191, 216)),
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('tomato', (255, 99, 71)),
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('turquoise', (64, 224, 208)),
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('violet', (238, 130, 238)),
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('wheat', (245, 222, 179)),
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('white', (255, 255, 255)),
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('whitesmoke', (245, 245, 245)),
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('yellow', (255, 255, 0)),
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('yellowgreen', (154, 205, 50)),
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]
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# (r, g, b, a) in 0..1 or a string marker
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SPECIAL_COLOR_KEYWORDS = {
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'currentcolor': 'currentColor',
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'transparent': RGBA(0., 0., 0., 0.),
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}
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# RGBA namedtuples of (r, g, b, a) in 0..1 or a string marker
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COLOR_KEYWORDS = SPECIAL_COLOR_KEYWORDS.copy()
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COLOR_KEYWORDS.update(
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# 255 maps to 1, 0 to 0, the rest is linear.
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(keyword, RGBA(r / 255., g / 255., b / 255., 1.))
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for keyword, (r, g, b) in itertools.chain(
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BASIC_COLOR_KEYWORDS, EXTENDED_COLOR_KEYWORDS))
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