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This module provides basic functions for handling mime-types. It can handle
matching mime-types against a list of media-ranges. See section 14.1 of
the HTTP specification [RFC 2616] for a complete explanation.

   http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.1

Based on mimeparse 0.1.2 by Joe Gregorio:

    http://code.google.com/p/mimeparse/

Contents:
    - parse_mime_type():   Parses a mime-type into its component parts.
    - parse_media_range(): Media-ranges are mime-types with wild-cards and a 'q' quality parameter.
    - quality():           Determines the quality ('q') of a mime-type when compared against a list of media-ranges.
    - quality_parsed():    Just like quality() except the second parameter must be pre-parsed.
    - best_match():        Choose the mime-type with the highest quality ('q') from a list of candidates.
    - desired_matches():   Filter against a list of desired mime-types in the order the server prefers.

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Carves up a mime-type and returns a tuple of the
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       get parsed into:

       ('application', '*', {'q', '0.5'})

       In addition this function also guarantees that there
       is a value for 'q' in the params dictionary, filling it
       in with a proper default if necessary.
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Find the best match for a given mime-type against
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       parsed by parse_media_range(). Returns a tuple of
       the fitness value and the value of the 'q' quality
       parameter of the best match, or (-1, 0) if no match
       was found. Just as for quality_parsed(), 'parsed_ranges'
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Find the best match for a given mime-type against
    a list of media_ranges that have already been
    parsed by parse_media_range(). Returns the
    'q' quality parameter of the best match, 0 if no
    match was found. This function behaves the same as quality()
    except that 'parsed_ranges' must be a list of
    parsed media ranges.i
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    against the media-ranges in ranges. For example:

    >>> quality('text/html','text/*;q=0.3, text/html;q=0.7, text/html;level=1, text/html;level=2;q=0.4, */*;q=0.5')
    0.7

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Takes a list of supported mime-types and finds the best
    match for all the media-ranges listed in header. In case of
    ambiguity, whatever comes first in the list will be chosen.
    The value of header must be a string that conforms to the format
    of the HTTP Accept: header. The value of 'supported' is a list
    of mime-types.

    >>> best_match(['application/xbel+xml', 'text/xml'], 'text/*;q=0.5,*/*; q=0.1')
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    one reads the specification. This function is provided for a server to
    declare a set of desired mime-types it supports, and returns a subset of
    the desired list in the same order should each one be Accepted by the
    browser.

    >>> desired_matches(['text/html', 'application/xml'],     ...     'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png')
    ['text/html', 'application/xml']
    >>> desired_matches(['text/html', 'application/xml'], 'application/xml,application/json')
    ['application/xml']
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