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dd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ ZdS )au  MIME-Type Parser

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

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.
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aR  Parses a mime-type into its component parts.

    Carves up a mime-type and returns a tuple of the (type, subtype, params)
    where 'params' is a dictionary of all the parameters for the media range.
    For example, the media range 'application/xhtml;q=0.5' would get parsed
    into:

       ('application', 'xhtml', {'q', '0.5'})
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ÿr   c                 C   s\   t | ƒ\}}}d|vs%|d r%t|d ƒr%t|d ƒdks%t|d ƒdk r)d|d< |||fS )aï  Parse a media-range into its component parts.

    Carves up a media range and returns a tuple of the (type, subtype,
    params) where 'params' is a dictionary of all the parameters for the media
    range.  For example, the media range 'application/*;q=0.5' would 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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þ
r!   c                    sÌ   d}d}t | ƒ\}}}|D ]R\}}‰ ||kp|dkp|dk}	||kp)|dkp)|dk}
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 }q|t|ƒfS )a³  Find the best match for a mime-type amongst parsed media-ranges.

    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 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' must be a list of parsed media ranges.
    éÿÿÿÿr   r   c                 S   s   | | S ©Nr   )ÚxÚyr   r   r   Ú<lambda>i   s    z,fitness_and_quality_parsed.<locals>.<lambda>c                    s0   g | ]\}}|d kr|ˆ v r|ˆ | krd‘qS )r   r   r   )r	   ÚkeyÚvalue©r   r   r   r   j   s
    þz.fitness_and_quality_parsed.<locals>.<listcomp>éd   é
   r   )r!   r   Úitemsr   )r   Úparsed_rangesÚbest_fitnessÚ
best_fit_qÚtarget_typeÚtarget_subtypeÚtarget_paramsr   r   Ú
type_matchÚsubtype_matchÚparam_matchesÚfitnessr   r)   r   Úfitness_and_quality_parsedV   s.   	ÿ
þù	€r7   c                 C   s   t | |ƒd S )a–  Find the best match for a mime-type amongst parsed media-ranges.

    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
    bahaves the same as quality() except that 'parsed_ranges' must be a list of
    parsed media ranges.
    r   )r7   )r   r-   r   r   r   Úquality_parsed{   s   
r8   c                 C   s   dd„ |  d¡D ƒ}t| |ƒS )aK  Return the quality ('q') of a mime-type against a list of media-ranges.

    Returns the quality 'q' of a mime-type when compared 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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r?   c                 C   st   t | d¡ƒ}dd„ |D ƒ}g }d}| D ]}| t||ƒ||f¡ |d7 }q| ¡  |d d d r8|d d p9dS )	aY  Return mime-type with the highest quality ('q') from list of candidates.

    Takes a list of supported mime-types and finds the best match for all the
    media-ranges listed in header. 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. The list of supported mime-types should be sorted
    in order of increasing desirability, in case of a situation where there is
    a tie.

    >>> best_match(['application/xbel+xml', 'text/xml'],
                   'text/*;q=0.5,*/*; q=0.1')
    'text/xml'
    r=   c                 S   r9   r   r:   r;   r   r   r   r   §   r   zbest_match.<locals>.<listcomp>r   r   r"   é   r   )Ú_filter_blankr   Úappendr7   Úsort)Ú	supportedÚheaderÚsplit_headerÚparsed_headerÚweighted_matchesÚposr   r   r   r   Ú
best_match˜   s   ÿ
 rJ   c                 c   s   � | D ]	}|  ¡ r|V  qd S r#   r   )Úir
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