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annotate roundup/cgi/accept_language.py @ 4905:6e313bdf6b69 routing

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routing: Add new roundup.web namespace with router component This branch is to untangle hardcoded Roundup URL scheme, make it more readable and customizable with extensions. Right now it doesn't seem possible to write extension that renders static HTML page at /about without modifying Roundup DB, and this web component should not depend on DB schema.
author anatoly techtonik <techtonik@gmail.com>
date Tue, 15 Jul 2014 13:33:43 +0300
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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