Mercurial > p > roundup > code
comparison roundup/cgi/accept_language.py @ 3426:52f89836d05b
Parse the Accept-Language header as defined in RFC2616.
| author | Alexander Smishlajev <a1s@users.sourceforge.net> |
|---|---|
| date | Sat, 03 Dec 2005 09:31:37 +0000 |
| parents | |
| children | 74476eaac38a |
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| 3425:2b27c92d64dc | 3426:52f89836d05b |
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| 1 """Parse the Accept-Language header as defined in RFC2616. | |
| 2 | |
| 3 See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4 | |
| 4 for details. This module should follow the spec. | |
| 5 Author: Hernan M. Foffani (hfoffani@gmail.com) | |
| 6 Some use samples: | |
| 7 | |
| 8 >>> parse("da, en-gb;q=0.8, en;q=0.7") | |
| 9 ['da', 'en_gb', 'en'] | |
| 10 >>> parse("en;q=0.2, fr;q=1") | |
| 11 ['fr', 'en'] | |
| 12 >>> parse("zn; q = 0.2 ,pt-br;q =1") | |
| 13 ['pt_br', 'zn'] | |
| 14 >>> parse("es-AR") | |
| 15 ['es_AR'] | |
| 16 >>> parse("es-es-cat") | |
| 17 ['es_es_cat'] | |
| 18 >>> parse("") | |
| 19 [] | |
| 20 >>> parse(None) | |
| 21 [] | |
| 22 >>> parse(" ") | |
| 23 [] | |
| 24 >>> parse("en,") | |
| 25 ['en'] | |
| 26 """ | |
| 27 | |
| 28 import re | |
| 29 import heapq | |
| 30 | |
| 31 # regexp for languange-range search | |
| 32 nqlre = "([A-Za-z]+[-[A-Za-z]+]*)$" | |
| 33 # regexp for languange-range search with quality value | |
| 34 qlre = "([A-Za-z]+[-[A-Za-z]+]*);q=([\d\.]+)" | |
| 35 # both | |
| 36 lre = re.compile(nqlre + "|" + qlre) | |
| 37 | |
| 38 ascii = ''.join([chr(x) for x in xrange(256)]) | |
| 39 whitespace = ' \t\n\r\v\f' | |
| 40 | |
| 41 def parse(language_header): | |
| 42 """parse(string_with_accept_header_content) -> languages list""" | |
| 43 | |
| 44 if language_header is None: return [] | |
| 45 | |
| 46 # strip whitespaces. | |
| 47 lh = language_header.translate(ascii, whitespace) | |
| 48 | |
| 49 # if nothing, return | |
| 50 if lh == "": return [] | |
| 51 | |
| 52 # split by commas and parse the quality values. | |
| 53 pls = [lre.findall(x) for x in lh.split(',')] | |
| 54 | |
| 55 # drop uncomformant | |
| 56 qls = [x[0] for x in pls if len(x) > 0] | |
| 57 | |
| 58 # use a heap queue to sort by quality values. | |
| 59 # the value of each item is 1.0 complement. | |
| 60 pq = [] | |
| 61 for l in qls: | |
| 62 if l[0] != '': | |
| 63 heapq.heappush(pq, (0.0, l[0])) | |
| 64 else: | |
| 65 heapq.heappush(pq, (1.0-float(l[2]), l[1])) | |
| 66 | |
| 67 # get the languages ordered by quality | |
| 68 # and replace - by _ | |
| 69 return [x[1].replace('-','_') for x in pq] | |
| 70 | |
| 71 if __name__ == "__main__": | |
| 72 import doctest | |
| 73 doctest.testmod() | |
| 74 | |
| 75 # vim: set et sts=4 sw=4 : |