CSS Colours

This module defines helpers for dealing with CSS colour strings.

The following constants are available:

• PREDEFINED: Tuple of the predefined colour literals available in most web

  browsers

• HEX_MATCHCompiled regular expression for HEX CSS colour values such as

  #F1A or #AB4CD9

• RGB_MATCHCompiled regular expression for rgb function calls such as

  rgb(0, 12, 255)

• RGBA_MATCH: Compiled regular expression for rgba function calls such as

  rgba(0, 12, 255, 0.3)

• HSL_MATCH: Compiled regular expression for hsl function calls such as

  hsl(120, 5%, 200%)

• HSLA_MATCH: Compiled regular expression for hsla function calls such as

  hsla(120, 5%, 200%, 0.3)

awl.css_colours.colour_to_rgb(colour)

Takes a web colour name or hex value and returns a tuple containing the corresponding decimal RGB values

Parameters:

colour – web colour name (e.g. “pink”) or hex colur (e.g. “#f0f”, “#f2d5e3”

Returns:

tuple with decimal RGB values

awl.css_colours.colour_to_rgb_string(colour)

Takes a web colour name or hex value and returns an rgb() string that can be used in a CSS file.

Parameters:

colour – web colour name (e.g. “pink”) or hex colur (e.g. “#f0f”, “#f2d5e3”

Returns:

CSS rgb() function string (e.g. rgb(102, 51, 153) )

awl.css_colours.is_colour(value)

Returns True if the value given is a valid CSS colour, i.e. matches one of the regular expressions in the module or is in the list of predetefined values by the browser.