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annotate roundup/cgi/accept_language.py @ 4994:868db43b302a

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Remove anypy.sets_ The anypy.sets_ package module is no longer used in the roundup codebase because python v2.4 is no longer supported. The anypy VERSION has been bumped to 0.3 to reflect this removal, but the version has probably never changed when other features were added in the past so this bump may be pointless.
author John Kristensen <john@jerrykan.com>
date Thu, 08 May 2014 18:44:29 +1000
parents 74476eaac38a
children b00cd44fea16
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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52f89836d05b Parse the Accept-Language header as defined in RFC2616.
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1 """Parse the Accept-Language header as defined in RFC2616.
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2
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3 See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.4
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4 for details. This module should follow the spec.
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5 Author: Hernan M. Foffani (hfoffani@gmail.com)
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6 Some use samples:
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7
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8 >>> parse("da, en-gb;q=0.8, en;q=0.7")
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9 ['da', 'en_gb', 'en']
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10 >>> parse("en;q=0.2, fr;q=1")
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11 ['fr', 'en']
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12 >>> parse("zn; q = 0.2 ,pt-br;q =1")
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13 ['pt_br', 'zn']
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14 >>> parse("es-AR")
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15 ['es_AR']
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16 >>> parse("es-es-cat")
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17 ['es_es_cat']
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18 >>> parse("")
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19 []
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20 >>> parse(None)
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21 []
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22 >>> parse(" ")
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23 []
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24 >>> parse("en,")
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25 ['en']
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26 """
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27
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28 import re
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29 import heapq
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30
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31 # regexp for languange-range search
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32 nqlre = "([A-Za-z]+[-[A-Za-z]+]*)$"
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33 # regexp for languange-range search with quality value
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34 qlre = "([A-Za-z]+[-[A-Za-z]+]*);q=([\d\.]+)"
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35 # both
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36 lre = re.compile(nqlre + "|" + qlre)
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37
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38 ascii = ''.join([chr(x) for x in range(256)])
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39 whitespace = ' \t\n\r\v\f'
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40
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41 def parse(language_header):
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42 """parse(string_with_accept_header_content) -> languages list"""
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43
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44 if language_header is None: return []
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45
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46 # strip whitespaces.
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47 lh = language_header.translate(ascii, whitespace)
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48
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49 # if nothing, return
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50 if lh == "": return []
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51
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52 # split by commas and parse the quality values.
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53 pls = [lre.findall(x) for x in lh.split(',')]
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54
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55 # drop uncomformant
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56 qls = [x[0] for x in pls if len(x) > 0]
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57
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58 # use a heap queue to sort by quality values.
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59 # the value of each item is 1.0 complement.
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60 pq = []
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61 for l in qls:
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62 if l[0] != '':
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63 heapq.heappush(pq, (0.0, l[0]))
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64 else:
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65 heapq.heappush(pq, (1.0-float(l[2]), l[1]))
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66
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67 # get the languages ordered by quality
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68 # and replace - by _
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69 return [x[1].replace('-','_') for x in pq]
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70
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71 if __name__ == "__main__":
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72 import doctest
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73 doctest.testmod()
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74
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75 # vim: set et sts=4 sw=4 :
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