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495 lines
16 KiB
495 lines
16 KiB
"""
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Color definitions are used as per CSS3 specification:
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http://www.w3.org/TR/css3-color/#svg-color
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A few colors have multiple names referring to the sames colors, eg. `grey` and `gray` or `aqua` and `cyan`.
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In these cases the LAST color when sorted alphabetically takes preferences,
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eg. Color((0, 255, 255)).as_named() == 'cyan' because "cyan" comes after "aqua".
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"""
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import math
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import re
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from colorsys import hls_to_rgb, rgb_to_hls
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from typing import TYPE_CHECKING, Any, Dict, Optional, Tuple, Union, cast
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from .errors import ColorError
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from .utils import Representation, almost_equal_floats
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if TYPE_CHECKING:
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from .typing import CallableGenerator, ReprArgs
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ColorTuple = Union[Tuple[int, int, int], Tuple[int, int, int, float]]
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ColorType = Union[ColorTuple, str]
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HslColorTuple = Union[Tuple[float, float, float], Tuple[float, float, float, float]]
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class RGBA:
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"""
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Internal use only as a representation of a color.
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"""
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__slots__ = 'r', 'g', 'b', 'alpha', '_tuple'
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def __init__(self, r: float, g: float, b: float, alpha: Optional[float]):
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self.r = r
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self.g = g
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self.b = b
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self.alpha = alpha
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self._tuple: Tuple[float, float, float, Optional[float]] = (r, g, b, alpha)
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def __getitem__(self, item: Any) -> Any:
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return self._tuple[item]
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# these are not compiled here to avoid import slowdown, they'll be compiled the first time they're used, then cached
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r_hex_short = r'\s*(?:#|0x)?([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])?\s*'
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r_hex_long = r'\s*(?:#|0x)?([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})([0-9a-f]{2})?\s*'
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_r_255 = r'(\d{1,3}(?:\.\d+)?)'
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_r_comma = r'\s*,\s*'
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r_rgb = fr'\s*rgb\(\s*{_r_255}{_r_comma}{_r_255}{_r_comma}{_r_255}\)\s*'
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_r_alpha = r'(\d(?:\.\d+)?|\.\d+|\d{1,2}%)'
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r_rgba = fr'\s*rgba\(\s*{_r_255}{_r_comma}{_r_255}{_r_comma}{_r_255}{_r_comma}{_r_alpha}\s*\)\s*'
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_r_h = r'(-?\d+(?:\.\d+)?|-?\.\d+)(deg|rad|turn)?'
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_r_sl = r'(\d{1,3}(?:\.\d+)?)%'
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r_hsl = fr'\s*hsl\(\s*{_r_h}{_r_comma}{_r_sl}{_r_comma}{_r_sl}\s*\)\s*'
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r_hsla = fr'\s*hsl\(\s*{_r_h}{_r_comma}{_r_sl}{_r_comma}{_r_sl}{_r_comma}{_r_alpha}\s*\)\s*'
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# colors where the two hex characters are the same, if all colors match this the short version of hex colors can be used
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repeat_colors = {int(c * 2, 16) for c in '0123456789abcdef'}
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rads = 2 * math.pi
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class Color(Representation):
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__slots__ = '_original', '_rgba'
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def __init__(self, value: ColorType) -> None:
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self._rgba: RGBA
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self._original: ColorType
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if isinstance(value, (tuple, list)):
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self._rgba = parse_tuple(value)
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elif isinstance(value, str):
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self._rgba = parse_str(value)
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elif isinstance(value, Color):
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self._rgba = value._rgba
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value = value._original
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else:
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raise ColorError(reason='value must be a tuple, list or string')
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# if we've got here value must be a valid color
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self._original = value
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@classmethod
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def __modify_schema__(cls, field_schema: Dict[str, Any]) -> None:
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field_schema.update(type='string', format='color')
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def original(self) -> ColorType:
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"""
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Original value passed to Color
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"""
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return self._original
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def as_named(self, *, fallback: bool = False) -> str:
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if self._rgba.alpha is None:
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rgb = cast(Tuple[int, int, int], self.as_rgb_tuple())
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try:
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return COLORS_BY_VALUE[rgb]
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except KeyError as e:
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if fallback:
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return self.as_hex()
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else:
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raise ValueError('no named color found, use fallback=True, as_hex() or as_rgb()') from e
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else:
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return self.as_hex()
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def as_hex(self) -> str:
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"""
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Hex string representing the color can be 3, 4, 6 or 8 characters depending on whether the string
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a "short" representation of the color is possible and whether there's an alpha channel.
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"""
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values = [float_to_255(c) for c in self._rgba[:3]]
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if self._rgba.alpha is not None:
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values.append(float_to_255(self._rgba.alpha))
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as_hex = ''.join(f'{v:02x}' for v in values)
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if all(c in repeat_colors for c in values):
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as_hex = ''.join(as_hex[c] for c in range(0, len(as_hex), 2))
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return '#' + as_hex
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def as_rgb(self) -> str:
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"""
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Color as an rgb(<r>, <g>, <b>) or rgba(<r>, <g>, <b>, <a>) string.
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"""
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if self._rgba.alpha is None:
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return f'rgb({float_to_255(self._rgba.r)}, {float_to_255(self._rgba.g)}, {float_to_255(self._rgba.b)})'
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else:
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return (
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f'rgba({float_to_255(self._rgba.r)}, {float_to_255(self._rgba.g)}, {float_to_255(self._rgba.b)}, '
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f'{round(self._alpha_float(), 2)})'
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)
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def as_rgb_tuple(self, *, alpha: Optional[bool] = None) -> ColorTuple:
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"""
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Color as an RGB or RGBA tuple; red, green and blue are in the range 0 to 255, alpha if included is
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in the range 0 to 1.
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:param alpha: whether to include the alpha channel, options are
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None - (default) include alpha only if it's set (e.g. not None)
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True - always include alpha,
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False - always omit alpha,
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"""
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r, g, b = (float_to_255(c) for c in self._rgba[:3])
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if alpha is None:
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if self._rgba.alpha is None:
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return r, g, b
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else:
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return r, g, b, self._alpha_float()
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elif alpha:
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return r, g, b, self._alpha_float()
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else:
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# alpha is False
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return r, g, b
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def as_hsl(self) -> str:
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"""
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Color as an hsl(<h>, <s>, <l>) or hsl(<h>, <s>, <l>, <a>) string.
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"""
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if self._rgba.alpha is None:
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h, s, li = self.as_hsl_tuple(alpha=False) # type: ignore
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return f'hsl({h * 360:0.0f}, {s:0.0%}, {li:0.0%})'
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else:
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h, s, li, a = self.as_hsl_tuple(alpha=True) # type: ignore
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return f'hsl({h * 360:0.0f}, {s:0.0%}, {li:0.0%}, {round(a, 2)})'
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def as_hsl_tuple(self, *, alpha: Optional[bool] = None) -> HslColorTuple:
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"""
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Color as an HSL or HSLA tuple, e.g. hue, saturation, lightness and optionally alpha; all elements are in
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the range 0 to 1.
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NOTE: this is HSL as used in HTML and most other places, not HLS as used in python's colorsys.
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:param alpha: whether to include the alpha channel, options are
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None - (default) include alpha only if it's set (e.g. not None)
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True - always include alpha,
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False - always omit alpha,
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"""
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h, l, s = rgb_to_hls(self._rgba.r, self._rgba.g, self._rgba.b)
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if alpha is None:
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if self._rgba.alpha is None:
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return h, s, l
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else:
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return h, s, l, self._alpha_float()
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if alpha:
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return h, s, l, self._alpha_float()
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else:
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# alpha is False
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return h, s, l
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def _alpha_float(self) -> float:
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return 1 if self._rgba.alpha is None else self._rgba.alpha
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@classmethod
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def __get_validators__(cls) -> 'CallableGenerator':
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yield cls
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def __str__(self) -> str:
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return self.as_named(fallback=True)
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def __repr_args__(self) -> 'ReprArgs':
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return [(None, self.as_named(fallback=True))] + [('rgb', self.as_rgb_tuple())] # type: ignore
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def __eq__(self, other: Any) -> bool:
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return isinstance(other, Color) and self.as_rgb_tuple() == other.as_rgb_tuple()
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def __hash__(self) -> int:
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return hash(self.as_rgb_tuple())
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def parse_tuple(value: Tuple[Any, ...]) -> RGBA:
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"""
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Parse a tuple or list as a color.
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"""
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if len(value) == 3:
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r, g, b = (parse_color_value(v) for v in value)
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return RGBA(r, g, b, None)
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elif len(value) == 4:
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r, g, b = (parse_color_value(v) for v in value[:3])
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return RGBA(r, g, b, parse_float_alpha(value[3]))
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else:
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raise ColorError(reason='tuples must have length 3 or 4')
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def parse_str(value: str) -> RGBA:
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"""
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Parse a string to an RGBA tuple, trying the following formats (in this order):
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* named color, see COLORS_BY_NAME below
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* hex short eg. `<prefix>fff` (prefix can be `#`, `0x` or nothing)
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* hex long eg. `<prefix>ffffff` (prefix can be `#`, `0x` or nothing)
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* `rgb(<r>, <g>, <b>) `
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* `rgba(<r>, <g>, <b>, <a>)`
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"""
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value_lower = value.lower()
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try:
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r, g, b = COLORS_BY_NAME[value_lower]
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except KeyError:
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pass
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else:
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return ints_to_rgba(r, g, b, None)
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m = re.fullmatch(r_hex_short, value_lower)
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if m:
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*rgb, a = m.groups()
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r, g, b = (int(v * 2, 16) for v in rgb)
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if a:
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alpha: Optional[float] = int(a * 2, 16) / 255
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else:
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alpha = None
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return ints_to_rgba(r, g, b, alpha)
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m = re.fullmatch(r_hex_long, value_lower)
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if m:
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*rgb, a = m.groups()
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r, g, b = (int(v, 16) for v in rgb)
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if a:
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alpha = int(a, 16) / 255
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else:
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alpha = None
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return ints_to_rgba(r, g, b, alpha)
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m = re.fullmatch(r_rgb, value_lower)
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if m:
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return ints_to_rgba(*m.groups(), None) # type: ignore
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m = re.fullmatch(r_rgba, value_lower)
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if m:
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return ints_to_rgba(*m.groups()) # type: ignore
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m = re.fullmatch(r_hsl, value_lower)
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if m:
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h, h_units, s, l_ = m.groups()
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return parse_hsl(h, h_units, s, l_)
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m = re.fullmatch(r_hsla, value_lower)
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if m:
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h, h_units, s, l_, a = m.groups()
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return parse_hsl(h, h_units, s, l_, parse_float_alpha(a))
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raise ColorError(reason='string not recognised as a valid color')
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def ints_to_rgba(r: Union[int, str], g: Union[int, str], b: Union[int, str], alpha: Optional[float]) -> RGBA:
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return RGBA(parse_color_value(r), parse_color_value(g), parse_color_value(b), parse_float_alpha(alpha))
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def parse_color_value(value: Union[int, str], max_val: int = 255) -> float:
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"""
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Parse a value checking it's a valid int in the range 0 to max_val and divide by max_val to give a number
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in the range 0 to 1
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"""
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try:
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color = float(value)
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except ValueError:
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raise ColorError(reason='color values must be a valid number')
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if 0 <= color <= max_val:
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return color / max_val
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else:
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raise ColorError(reason=f'color values must be in the range 0 to {max_val}')
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def parse_float_alpha(value: Union[None, str, float, int]) -> Optional[float]:
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"""
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Parse a value checking it's a valid float in the range 0 to 1
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"""
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if value is None:
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return None
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try:
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if isinstance(value, str) and value.endswith('%'):
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alpha = float(value[:-1]) / 100
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else:
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alpha = float(value)
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except ValueError:
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raise ColorError(reason='alpha values must be a valid float')
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if almost_equal_floats(alpha, 1):
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return None
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elif 0 <= alpha <= 1:
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return alpha
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else:
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raise ColorError(reason='alpha values must be in the range 0 to 1')
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def parse_hsl(h: str, h_units: str, sat: str, light: str, alpha: Optional[float] = None) -> RGBA:
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"""
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Parse raw hue, saturation, lightness and alpha values and convert to RGBA.
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"""
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s_value, l_value = parse_color_value(sat, 100), parse_color_value(light, 100)
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h_value = float(h)
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if h_units in {None, 'deg'}:
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h_value = h_value % 360 / 360
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elif h_units == 'rad':
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h_value = h_value % rads / rads
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else:
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# turns
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h_value = h_value % 1
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r, g, b = hls_to_rgb(h_value, l_value, s_value)
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return RGBA(r, g, b, alpha)
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def float_to_255(c: float) -> int:
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return int(round(c * 255))
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COLORS_BY_NAME = {
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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),
|
|
'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),
|
|
}
|
|
|
|
COLORS_BY_VALUE = {v: k for k, v in COLORS_BY_NAME.items()}
|