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annotate roundup/cgi/accept_language.py @ 5920:ff7e089fd4ef

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support python 3.4 testing python 3.4 is not supported by any 1.4 release of mysqlclient. Pip is installing the 1.4.4 version even when run from python 3.4. Check version and install 1.3.14 on python 3.4 but newest one on all other versions.
author John Rouillard <rouilj@ieee.org>
date Sun, 13 Oct 2019 14:17:33 -0400
parents 936275dfe1fa
children ed8a9974c1bd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 = r"([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 whitespace = ' \t\n\r\v\f'
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39 try:
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40 # Python 3.
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41 remove_ws = (str.maketrans('', '', whitespace),)
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42 except AttributeError:
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43 # Python 2.
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44 remove_ws = (None, whitespace)
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45
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46 def parse(language_header):
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47 """parse(string_with_accept_header_content) -> languages list"""
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48
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49 if language_header is None: return []
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50
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51 # strip whitespaces.
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52 lh = language_header.translate(*remove_ws)
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53
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54 # if nothing, return
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55 if lh == "": return []
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56
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57 # split by commas and parse the quality values.
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58 pls = [lre.findall(x) for x in lh.split(',')]
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59
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60 # drop uncomformant
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61 qls = [x[0] for x in pls if len(x) > 0]
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62
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63 # use a heap queue to sort by quality values.
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64 # the value of each item is 1.0 complement.
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65 pq = []
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66 for l in qls:
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67 if l[0] != '':
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68 heapq.heappush(pq, (0.0, l[0]))
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69 else:
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70 heapq.heappush(pq, (1.0-float(l[2]), l[1]))
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71
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72 # get the languages ordered by quality
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73 # and replace - by _
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74 return [x[1].replace('-','_') for x in pq]
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75
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76 if __name__ == "__main__":
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77 import doctest
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78 doctest.testmod()
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79
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80 # vim: set et sts=4 sw=4 :
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