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# -*- coding: utf-8 -*-
"""
colorful
~~~~~~~~
Terminal string styling done right, in Python.
:copyright: (c) 2017 by Timo Furrer <tuxtimo@gmail.com>
:license: MIT, see LICENSE for more details.
"""
import re
def hex_to_rgb(value):
"""
Convert the given hex string to a
valid RGB channel triplet.
"""
value = value.lstrip('#')
check_hex(value)
length = len(value)
step = int(length / 3)
return tuple(int(value[i:i+step], 16) for i in range(0, length, step))
def check_hex(value):
"""
Check if the given hex value is a valid RGB color
It should match the format: [0-9a-fA-F]
and be of length 3 or 6.
"""
length = len(value)
if length not in (3, 6):
raise ValueError('Hex string #{} is too long'.format(value))
regex = r'[0-9a-f]{{{length}}}'.format(length=length)
if not re.search(regex, value, re.I):
raise ValueError('Invalid Hex String: #{}'.format(value))
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