def web2hex()

in chartify/_core/colour.py [0:0]

• 11 lines of code
• 10 McCabe index (conditional complexity)

def web2hex(web, force_long=False):
    """Converts WEB representation to HEX

    :param rgb: web string representation (human readable if possible)
    :rtype: 3 hex char or 6 hex char string representation

    WEB representation uses X11 rgb.txt to define conversion
    between RGB and english color names.

    Usage
    =====

    >>> from colour import web2hex

    >>> web2hex('red')
    '#f00'

    >>> web2hex('#aaa')
    '#aaa'

    >>> web2hex('#foo')  # doctest: +ELLIPSIS
    Traceback (most recent call last):
    ...
    AttributeError: '#foo' is not in web format. Need 3 or 6 hex digit.

    >>> web2hex('#aaa', force_long=True)
    '#aaaaaa'

    >>> web2hex('#aaaaaa')
    '#aaaaaa'

    >>> web2hex('#aaaa')  # doctest: +ELLIPSIS
    Traceback (most recent call last):
    ...
    AttributeError: '#aaaa' is not in web format. Need 3 or 6 hex digit.

    >>> web2hex('pinky')  # doctest: +ELLIPSIS
    Traceback (most recent call last):
    ...
    ValueError: 'pinky' is not a recognized color.

    And color names are case insensitive:

    >>> Color('RED')
    <Color red>

    """
    if web.startswith("#"):
        if LONG_HEX_COLOR.match(web) or (not force_long and SHORT_HEX_COLOR.match(web)):
            return web.lower()
        elif SHORT_HEX_COLOR.match(web) and force_long:
            return "#" + "".join([("%s" % (t,)) * 2 for t in web[1:]])
        raise AttributeError("%r is not in web format. Need 3 or 6 hex digit." % web)

    web = web.lower()
    if web not in COLOR_NAME_TO_RGB:
        raise ValueError("%r is not a recognized color." % web)

    # convert dec to hex:

    return rgb2hex([float(int(v)) / 255 for v in COLOR_NAME_TO_RGB[web]], force_long)