text: #-----------------------------------------------------------------------------
  # Copyright (c) 2012 - 2021, Anaconda, Inc., and Bokeh Contributors.
  # All rights reserved.
  #
  # The full license is in the file LICENSE.txt, distributed with this software.
  #-----------------------------------------------------------------------------
  """ Provide color related properties.
  
  """
  
  #-----------------------------------------------------------------------------
  # Boilerplate
  #-----------------------------------------------------------------------------
  from __future__ import annotations
  
  import logging # isort:skip
  log = logging.getLogger(__name__)
  
  #-----------------------------------------------------------------------------
  # Imports
  #-----------------------------------------------------------------------------
  
  # Standard library imports
  import re
  
  # Bokeh imports
  from ... import colors
  from .. import enums
  from .bases import Property
  from .container import Tuple
  from .either import Either
  from .enum import Enum
  from .numeric import Byte, Percent
  from .singletons import Undefined
  from .string import Regex
  
  #-----------------------------------------------------------------------------
  # Globals and constants
  #-----------------------------------------------------------------------------
  
  __all__ = (
      'Alpha',
      'Color',
      'RGB',
      'ColorHex',
  )
  
  #-----------------------------------------------------------------------------
  # General API
  #-----------------------------------------------------------------------------
  
  
  class RGB(Property):
      """ Accept colors.RGB values.
  
      """
  
      def validate(self, value, detail=True):
          super().validate(value, detail)
  
          if isinstance(value, colors.RGB):
              return
  
          msg = "" if not detail else f"expected RGB value, got {value!r}"
          raise ValueError(msg)
  
  
  class Color(Either):
      """ Accept color values in a variety of ways.
  
      * If a color is provided as a string, Bokeh determines whether this string
        represents one of the |named CSS colors| (such as "red"), a CSS4 color
        string (such as "rgb(0, 200, 0)"), or a hex value (such as "#00FF00").
      * If a 3-tuple is provided, it is treated as RGB values (between 0 and
        255).
      * If a 4-tuple is provided, it is treated as RGBA values (between 0 and
        255 for RGB and alpha as a float between 0 and 1).
      * If a 32-bit unsigned integer is provided, it is treated as RGBA values in
        a 0xRRGGBBAA byte order pattern.
  
      Example:
  
          .. code-block:: python
  
              >>> class ColorModel(HasProps):
              ...     prop = Color()
              ...
  
              >>> m = ColorModel()
  
              >>> m.prop = "firebrick"
  
              >>> m.prop = "#a240a2"
  
              >>> m.prop = (100, 100, 255)
  
              >>> m.prop = (100, 100, 255, 0.5)
  
              >>> m.prop = "junk"              # ValueError !!
  
              >>> m.prop = (100.2, 57.3, 10.2) # ValueError !!
  
      """
  
      _default_help = """\
      Acceptable values are:
  
      - any of the |named CSS colors|, e.g ``'green'``, ``'indigo'``
      - RGB(A) hex strings, e.g., ``'#FF0000'``, ``'#44444444'``
      - CSS4 color strings, e.g., ``'rgba(255, 0, 127, 0.6)'``,
        ``'rgb(0 127 0 / 1.0)'``, or ``'hsl(60deg 100% 50% / 1.0)'``
      - a 3-tuple of integers (r, g, b) between 0 and 255
      - a 4-tuple of (r, g, b, a) where r, g, b are integers between 0 and 255,
        and a is between 0 and 1
      - a 32-bit unsigned integer using the 0xRRGGBBAA byte order pattern
  
      """
  
      def __init__(self, default=Undefined, help=None):
          types = (Enum(enums.NamedColor),
                   Regex(r"^#[0-9a-fA-F]{3}$"),
                   Regex(r"^#[0-9a-fA-F]{4}$"),
                   Regex(r"^#[0-9a-fA-F]{6}$"),
                   Regex(r"^#[0-9a-fA-F]{8}$"),
                   Regex(r"^rgba\(((25[0-5]|2[0-4]\d|1\d{1,2}|\d\d?)\s*,"
                         r"\s*?){2}(25[0-5]|2[0-4]\d|1\d{1,2}|\d\d?)\s*,"
                         r"\s*([01]\.?\d*?)\)"),
                   Regex(r"^rgb\(((25[0-5]|2[0-4]\d|1\d{1,2}|\d\d?)\s*,"
                         r"\s*?){2}(25[0-5]|2[0-4]\d|1\d{1,2}|\d\d?)\s*?\)"),
                   Tuple(Byte, Byte, Byte),
                   Tuple(Byte, Byte, Byte, Percent),
                   RGB)
          help = f"{help or ''}\n{self._default_help}"
          super().__init__(*types, default=default, help=help)
  
      def __str__(self):
          return self.__class__.__name__
  
      def transform(self, value):
          if isinstance(value, tuple):
              value = colors.RGB(*value).to_css()
          return value
  
  
  class ColorHex(Color):
      """ ref Color
  
      The only difference to Color is that this class transforms values into
      hexadecimal strings to be sent to BokehJS.
  
      """
  
      def transform(self, value):
          if isinstance(value, str):
              value = value.lower()
              if value.startswith('rgb'):
                  value = colors.RGB(*[int(val) for val in re.findall(r"\d+", value)[:3]]).to_hex()
              elif value in enums.NamedColor:
                  value = getattr(colors.named, value).to_hex()
          elif isinstance(value, tuple):
              value = colors.RGB(*value).to_hex()
          else:
              value = value.to_hex()
          return value.lower()
  
  
  class Alpha(Percent):
  
      _default_help = """\
      Acceptable values are floating-point numbers between 0 and 1 (0 being
      transparent and 1 being opaque).
      """
  
      def __init__(self, default=1.0, help=None):
          help = f"{help or ''}\n{self._default_help}"
          super().__init__(default=default, help=help)
  
  #-----------------------------------------------------------------------------
  # Dev API
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Private API
  #-----------------------------------------------------------------------------
  
  #-----------------------------------------------------------------------------
  # Code
  #-----------------------------------------------------------------------------
  