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path: root/textoutpc/tags/builtin/__color__.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
""" HTML/CSS like color parsing, mainly for the `[color]` tag.
	Defines the `get_color()` function which returns an rgba value.
"""

import re as _re
import colorsys as _color
import math as _math

__all__ = ["get_color"]

# ---
# Color names and correspondances.
# ---

_colors = {
	# Standard CSS color names.
	'aliceblue': '#F0F8FF', 'antiquewhite': '#FAEBD7', 'aqua': '#00FFFF',
	'aquamarine': '#7FFFD4', 'azure': '#F0FFFF', 'beige': '#F5F5DC',
	'bisque': '#FFE4C4', 'black': '#000000', 'blanchedalmond': '#FFEBCD',
	'blue': '#0000FF', 'blueviolet': '#8A2BE2', 'brown': '#A52A2A',
	'burlywood': '#DEB887', 'cadetblue': '#5F9EA0', 'chartreuse': '#7FFF00',
	'chocolate': '#D2691E', 'coral': '#FF7F50', 'cornflowerblue': '#6495ED',
	'cornsilk': '#FFF8DC', 'crimson': '#DC143C', 'cyan': '#00FFFF',
	'darkblue': '#00008B', 'darkcyan': '#008B8B', 'darkgoldenrod': '#B8860B',
	'darkgray': '#A9A9A9', 'darkgrey': '#A9A9A9', 'darkgreen': '#006400',
	'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',
	'fuchsia': '#FF00FF', 'gainsboro': '#DCDCDC', 'ghostwhite': '#F8F8FF',
	'gold': '#FFD700', 'goldenrod': '#DAA520', 'gray': '#808080',
	'grey': '#808080', 'green': '#008000', 'greenyellow': '#ADFF2F',
	'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', 'lightgrey': '#D3D3D3', 'lightgreen': '#90EE90',
	'lightpink': '#FFB6C1', 'lightsalmon': '#FFA07A',
	'lightseagreen': '#20B2AA', 'lightskyblue': '#87CEFA',
	'lightslategray': '#778899', 'lightslategrey': '#778899',
	'lightsteelblue': '#B0C4DE', 'lightyellow': '#FFFFE0',
	'lime': '#00FF00', 'limegreen': '#32CD32', 'linen': '#FAF0E6',
	'magenta': '#FF00FF', 'maroon': '#800000', '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', 'navy': '#000080',
	'oldlace': '#FDF5E6', 'olive': '#808000', 'olivedrab': '#6B8E23',
	'orange': '#FFA500', 'olivedrab': '#6B8E23', 'orange': '#FFA500',
	'orangered': '#FF4500', 'orchid': '#DA70D6', 'palegoldenrod': '#EEE8AA',
	'palegreen': '#98FB98', 'paleturquoise': '#AFEEEE',
	'palevioletred': '#DB7093', 'papayawhip': '#FFEFD5',
	'peachpuff': '#FFDAB9', 'peru': '#CD853F', 'pink': '#FFC0CB',
	'plum': '#DDA0DD', 'powderblue': 'B0E0E6', 'purple': '#800080',
	'rebeccapurple': '#663399', 'red': '#FF0000', 'rosybrown': '#BC8F8F',
	'royalblue': '#4169E1', 'saddlebrown': '#8B4513', 'salmon': '#FA8072',
	'sandybrown': '#F4A460', 'seagreen': '#2E8B57', 'seashell': '#FFF5EE',
	'sienna': '#A0522D', 'silver': '#C0C0C0', 'skyblue': '#87CEEB',
	'slateblue': '#6A5ACD', 'slategray': '#708090', 'slategrey': '#708090',
	'snow': '#FFFAFA', 'springgreen': '#00FF7F', 'steelblue': '#4682B4',
	'tan': '#D2B48C', 'teal': '#008080', 'thistle': '#D8BFD8',
	'tomato': '#FF6347', 'turquoise': '#40E0D0', 'violet': '#EE82EE',
	'wheat': '#F5DEB3', 'white': '#FFFFFF', 'whitesmoke': '#F5F5F5',
	'yellow': '#FFFF00', 'yellowgreen': '#9ACD32',

	# Planète Casio special colors.
	'transparent': 'rgba(0, 0, 0, 0)',
}

_cr = _re.compile(''
	'rgba?\s*\('
		'\s*' '(?P<rgb_r>[0-9]{1,3})' '\s*,'
		'\s*' '(?P<rgb_g>[0-9]{1,3})' '\s*,'
		'\s*' '(?P<rgb_b>[0-9]{1,3})' '\s*(,'
			'\s*' '((?P<rgb_a_per>0*[0-9]{0,3}(\.[0-9]*)?)%'
			'|(?P<rgb_a_flt>0*(\.[0-9]*)?))' '\s*)?'
	'\)'
	'|hsla?\s*\('
		'\s*' '(?P<hsl_hue>-?0*[0-9]{1,3}(\.[0-9]*)?)'
			'(?P<hsl_agl>deg|grad|rad|turn|)' '\s*[,\\s]'
		'\s*' '((?P<hsl_sat_per>0*[0-9]{1,3}(\.[0-9]*)?)%'
			'|(?P<hsl_sat_flt>0*(\.[0-9]*)?))' '\s*[,\\s]'
		'\s*' '((?P<hsl_lgt_per>0*[0-9]{1,3}(\.[0-9]*)?)%'
			'|(?P<hsl_lgt_flt>0*(\.[0-9]*)?))' '\s*([,\\s]'
		'\s*' '((?P<hsl_aph_per>0*[0-9]{0,3}(\.[0-9]*)?)%'
			'|(?P<hsl_aph_flt>0*(\.[0-9]*)?))' '\s*)?'
	'\)'
	'|hlsa?\s*\('
		'\s*' '(?P<hls_hue>-?0*[0-9]{1,3}(\.[0-9]*)?)'
			'(?P<hls_agl>deg|grad|rad|turn|)' '\s*[,\\s]'
		'\s*' '((?P<hls_lgt_per>0*[0-9]{1,3}(\.[0-9]*)?)%'
			'|(?P<hls_lgt_flt>0*(\.[0-9]*)?))' '\s*[,\\s]'
		'\s*' '((?P<hls_sat_per>0*[0-9]{1,3}(\.[0-9]*)?)%'
			'|(?P<hls_sat_flt>0*(\.[0-9]*)?))' '\s*([,\\s]'
		'\s*' '((?P<hls_aph_per>0*[0-9]{0,3}(\.[0-9]*)?)%'
			'|(?P<hls_aph_flt>0*(\.[0-9]*)?))' '\s*)?'
	'\)'
	'|hwb\s*\('
		'\s*' '(?P<hwb_hue>-?0*[0-9]{1,3}(\.[0-9]*)?)'
			'(?P<hwb_agl>deg|grad|rad|turn|)' '\s*[,\\s]'
		'\s*' '((?P<hwb_wht_per>0*[0-9]{1,3})%'
			'|(?P<hwb_wht_flt>0*(\.[0-9]*)?))' '\s*[,\\s]'
		'\s*' '((?P<hwb_blk_per>0*[0-9]{1,3})%'
			'|(?P<hwb_blk_flt>0*(\.[0-9]*)?))' '\s*'
	'\)'
	'|(?P<hex_hash>\#?)'
		'(?P<hex_digits>[0-9a-z]*)'
'', _re.I)

# ---
# Utilitaires.
# ---

def _hwb_to_rgb(h, w, b):
	""" Convert HWB to RGB color.
		https://drafts.csswg.org/css-color/#hwb-to-rgb """

	r, g, b = _color.hls_to_rgb(h, 0.5, 1.0)
	f = lambda x: x * (1 - w - b) + w
	return f(r), f(g), f(b)

# ---
# Main function.
# ---

def get_color(value):
	""" Get a color from a string.
		Returns an (r, g, b, a) color.
		Raises an exception if there's a problem. """

	# Check if is a color name.
	try:    value = _colors[value.lower()]
	except: pass

	# Initialize the alpha.
	alpha = 1.0

	# Get the match.
	match = _cr.match(value).groupdict()
	if   match['hex_digits']:
		# Imitate the Netscape behaviour. Find more about this here:
		# https://stackoverflow.com/a/8333464

		hx = match['hex_digits'].lower()
		hx = ''.join(c if c in '0123456789abcdef' \
			else ('0', '00')[ord(c) > 0xFFFF] for c in hx)[:128]
		if match['hex_hash'] and len(hx) == 3:
			hx = hx[0] * 2 + hx[1] * 2 + hx[2] * 2

		iv = _math.ceil(len(hx) / 3)
		of = iv - 8 if iv > 8 else 0
		sz = iv - of
		gr = list(map(lambda i: hx[i * iv + of:i * iv + iv] \
			.ljust(sz, '0'), range(3)))
		pre = min(map(lambda x: len(x) - len(x.lstrip('0')), gr))
		pre = min(pre, sz - 2)

		r, g, b = map(lambda x: int('0' + x[pre:pre + 2], 16), gr)
	elif match['rgb_r']:
		r = int(match['rgb_r'])
		g = int(match['rgb_g'])
		b = int(match['rgb_b'])

		# Alpha value.
		if   match['rgb_a_per']:
			alpha = float(match['rgb_a_per']) / 100.0
		elif match['rgb_a_flt']:
			alpha = float(match['rgb_a_flt'])
	elif match['hsl_hue'] or match['hls_hue']:
		if match['hsl_hue']:
			hue = float(match['hsl_hue'])
			agl = match['hsl_agl']

			# Saturation.
			if match['hsl_sat_per']:
				sat = float(match['hsl_sat_per']) / 100.0
			else:
				sat = float(match['hsl_sat_flt'])
				if sat > 1.0:
					sat /= 100.0

			# Light.
			if match['hsl_lgt_per']:
				lgt = float(match['hsl_lgt_per']) / 100.0
			else:
				lgt = float(match['hsl_lgt_flt'])
				if lgt > 1.0:
					lgt /= 100.0

			# Alpha value.
			if   match['hsl_aph_per']:
				alpha = float(match['hsl_aph_per']) / 100.0
			elif match['hsl_aph_flt']:
				alpha = float(match['hsl_aph_flt'])
		else:
			hue = float(match['hls_hue'])
			agl = match['hls_agl']

			# Saturation.
			if match['hls_sat_per']:
				sat = float(match['hls_sat_per']) / 100.0
			else:
				sat = float(match['hls_sat_flt'])

			# Light.
			if match['hls_lgt_per']:
				lgt = float(match['hls_lgt_per']) / 100.0
			else:
				lgt = float(match['hls_lgt_flt'])

			# Alpha value.
			if   match['hls_aph_per']:
				alpha = float(match['hls_aph_per']) / 100.0
			elif match['hls_aph_flt']:
				alpha = float(match['hls_aph_flt'])

		# Prepare the angle.
		if   agl == 'grad':
			hue = hue * 400.0
		elif agl == 'rad':
			hue = hue / (2 * math.pi)
		elif not agl or agl == 'deg':
			hue = hue / 360.0
		hue = hue % 1.0

		if sat > 1 or lgt > 1:
			raise Exception

		r, g, b = _color.hls_to_rgb(hue, lgt, sat)
		r, g, b = map(lambda x:int(round(x * 255)), (r, g, b))
	elif match['hwb_hue']:
		hue = float(match['hwb_hue'])
		agl = match['hwb_agl']

		# Saturation.
		if match['hwb_wht_per']:
			wht = float(match['hwb_wht_per']) / 100.0
		else:
			wht = float(match['hwb_wht_flt'])

		# Light.
		if match['hwb_blk_per']:
			blk = float(match['hwb_blk_per']) / 100.0
		else:
			blk = float(match['hwb_blk_flt'])

		# Prepare the angle.
		if   agl == 'grad':
			hue = hue * 400.0
		elif agl == 'rad':
			hue = hue / (2 * math.pi)
		elif not agl or agl == 'deg':
			hue = hue / 360.0
		hue = hue % 1.0

		if wht > 1 or blk > 1:
			raise Exception
		r, g, b = _hwb_to_rgb(hue, wht, blk)
		r, g, b = map(lambda x: int(round(x * 255)), (r, g, b))

	if r < 0 or r > 255 or g < 0 or g > 255 or b < 0 or b > 255:
		raise Exception
	if alpha < 0.0 or alpha > 1.0:
		raise Exception

	return (r, g, b, alpha)

# End of file.