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annotate roundup/cgi/accept_language.py @ 5418:55f09ca366c4

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Python 3 preparation: StringIO. This generally arranges for StringIO and cStringIO references to use io.StringIO for Python 3 but io.BytesIO for Python 2, consistent with the string representations generally used in Roundup. A special FasterStringIO in the TAL code, which referenced internals of the old Python 2 StringIO module, is cut down so it doesn't actually do anything beyond the StringIO class it inherits from (it would also be reasonable to remove FasterStringIO completely). One place in roundup_server.py clearly needing binary I/O is made to use io.BytesIO unconditionally.
author Joseph Myers <jsm@polyomino.org.uk>
date Wed, 25 Jul 2018 09:08:29 +0000
parents 74476eaac38a
children b00cd44fea16
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 = "([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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