U Ú²g‚ã@sldZddlmZddlmZdZdZdZdZdZ d d „Z d d „Z d d„Z dd„Z dd„Zdd„Zdd„ZdS)auMIME-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. é)Úabsolute_import)Úreducez0.1.3z Joe Gregoriozjoe@bitworking.orgz MIT LicenseÚcCs\| d¡}tdd„|dd…Dƒƒ}|d ¡}|dkr/sz.parse_mime_type...ú=é)ÚtupleÚsplit)r Úparamrrr r /sz#parse_mime_type..rNrÚ*z*/*ú/)rÚdictr)Ú mime_typeÚpartsÚparamsZ full_typeÚtypeÚsubtyperrr Úparse_mime_type#s ÿ rcCs\t|ƒ\}}}d|ksJ|drJt|dƒrJt|dƒdksJt|dƒdkrRd|d<|||fS)aïParse 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. ÚqrrÚ1)rÚfloat)Úrangerrrrrr Úparse_media_range;sÿþ ýüûrc sÌd}d}t|ƒ\}}}|D]¤\}}‰||kp:|dkp:|dk} ||kpR|dkpR|dk} | r| rtdd„‡fdd„| ¡Dƒdƒ} ||krŠdpŒd} | ||krœd pžd7} | | 7} | |kr| }ˆd }q|t|ƒfS) a³Find 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. éÿÿÿÿrrcSs||S©Nr)ÚxÚyrrr Úióz,fitness_and_quality_parsed..cs0g|](\}}|dkr|ˆkr|ˆ|krd‘qS)rrr)r ÚkeyÚvalue©rrr r js  þz.fitness_and_quality_parsed..édé r)rrÚitemsr) rÚ parsed_rangesZ best_fitnessZ best_fit_qZ target_typeZtarget_subtypeZ target_paramsrrZ type_matchZ subtype_matchZ param_matchesZfitnessrr(r Úfitness_and_quality_parsedVs, ÿ þù  r-cCst||ƒdS)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)r-)rr,rrr Úquality_parsed{s r.cCsdd„| d¡Dƒ}t||ƒS)aKReturn 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 cSsg|] }t|ƒ‘qSr©r©r Úrrrr r “szquality..ú,)rr.)rÚrangesr,rrr Úqualityˆs r4cCstt| d¡ƒ}dd„|Dƒ}g}d}|D]"}| t||ƒ||f¡|d7}q(| ¡|dddrp|ddprdS) aYReturn 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' r2cSsg|] }t|ƒ‘qSrr/r0rrr r §szbest_match..rrr ér)Ú _filter_blankrÚappendr-Úsort)Ú supportedÚheaderZ split_headerZ parsed_headerZweighted_matchesÚposrrrr Ú best_match˜sÿ r<ccs|D]}| ¡r|VqdSr!r)Úir rrr r6´sr6N)Ú__doc__Ú __future__rÚ functoolsrÚ __version__Ú __author__Ú __email__Ú __license__Ú __credits__rrr-r.r4r<r6rrrr Ús  %