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"""

webencodings.mklabels
    ~~~~~~~~~~~~~~~~~~~~~

Regenarate the webencodings.labels module.

:copyright: Copyright 2012 by Simon Sapin
    :license: BSD, see LICENSE for details.

"""

import json
try:
    from urllib import urlopen
except ImportError:
    from urllib.request import urlopen

def assert_lower(string):
    assert string == string.lower()
    return string

def generate(url):
    parts = ['''\
"""

webencodings.labels
    ~~~~~~~~~~~~~~~~~~~

Map encoding labels to their name.

:copyright: Copyright 2012 by Simon Sapin
    :license: BSD, see LICENSE for details.

"""

# XXX Do not edit!
# This file is automatically generated by mklabels.py

LABELS = {
''']
    labels = [
        (repr(assert_lower(label)).lstrip('u'),
         repr(encoding['name']).lstrip('u'))
        for category in json.loads(urlopen(url).read().decode('ascii'))
        for encoding in category['encodings']
        for label in encoding['labels']]
    max_len = max(len(label) for label, name in labels)
    parts.extend(
        '    %s:%s %s,\n' % (label, ' ' * (max_len - len(label)), name)
        for label, name in labels)
    parts.append('}')
    return ''.join(parts)

if __name__ == '__main__':
    print(generate('http://encoding.spec.whatwg.org/encodings.json'))

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