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# vim: ts=4 sts=4 et ai sw=4 fileencoding=utf-8
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#
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# Copyright © 2010 Greek Research and Technology Network
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#
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import re
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from django.conf.urls.defaults import url
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_accept_re = re.compile(r'([^\s;,]+)(?:[^,]*?;\s*q=(\d*(?:\.\d+)?))?')
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def parse_accept_header(value):
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    """Parse an HTTP Accept header
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    Returns an ordered by quality list of tuples (value, quality)
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    """
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    if not value:
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        return []
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    result = []
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    for match in _accept_re.finditer(value):
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        quality = match.group(2)
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        if not quality:
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            quality = 1
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        else:
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            quality = max(min(float(quality), 1), 0)
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        result.append((match.group(1), quality))
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    # sort by quality
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    result.sort(key=lambda x: x[1])
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    return result
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def url_with_format(regex, *args, **kwargs):
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    """
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    An extended url() that adds an .json/.xml suffix to the end to avoid DRY
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    """
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    if regex[-1] == '$' and regex[-2] != '\\':
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        regex = regex[:-1]
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    regex = regex + r'(\.(?P<emitter_format>json|xml))?$'
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    return url(regex, *args, **kwargs)