Source Code for Module languageHandler

  1  import config 
  2  import os 
  3  import ctypes 
  4  import locale 
  5  import gettext 
  6   
  7  #a few Windows locale constants 
  8  LOCALE_SLANGUAGE=0x2 
  9  LOCALE_SLANGDISPLAYNAME=0x6f 
 10   
 11  curLang="en" 
 12   
 13 -def localeNameToWindowsLCID(localeName): 
 14          """Retreave the Windows locale identifier (LCID) for the given locale name 
 15          @param localeName: a string of 2letterLanguage_2letterCountry or or just 2letterLanguage 
 16          @type localeName: string 
 17          @returns: a Windows LCID 
 18          @rtype: integer 
 19          """  
 20          localeName=locale.normalize(localeName) 
 21          if '.' in localeName: 
 22                  localeName=localeName.split('.')[0] 
 23          #Windows Vista is able to convert locale names to LCIDs 
 24          func_LocaleNameToLCID=getattr(ctypes.windll.kernel32,'LocaleNameToLCID',None) 
 25          if func_LocaleNameToLCID is not None: 
 26                  localeName=localeName.replace('_','-') 
 27                  LCID=func_LocaleNameToLCID(unicode(localeName),0) 
 28          else: #Windows doesn't have this functionality, manually search Python's windows_locale dictionary for the LCID 
 29                  LCList=[x[0] for x in locale.windows_locale.iteritems() if x[1]==localeName] 
 30                  if len(LCList)>0: 
 31                          LCID=LCList[0] 
 32                  else: 
 33                          LCID=0 
 34          return LCID 
 35   
 36 -def getLanguageDescription(language): 
 37          """Finds out the description (licalized full name) of a given local name""" 
 38          LCID=localeNameToWindowsLCID(language) 
 39          if LCID==0: return None 
 40          buf=ctypes.create_unicode_buffer(1024) 
 41          #If the original locale didn't have country info (was just language) then make sure we just get language from Windows 
 42          if '_' not in language: 
 43                  res=ctypes.windll.kernel32.GetLocaleInfoW(LCID,LOCALE_SLANGDISPLAYNAME,buf,1024) 
 44          else: 
 45                  res=0 
 46          if res==0: 
 47                  res=ctypes.windll.kernel32.GetLocaleInfoW(LCID,LOCALE_SLANGUAGE,buf,1024) 
 48          sLanguage=buf.value 
 49          return sLanguage 
 50   
 51 -def getAvailableLanguages(): 
 52          """generates a list of locale names, plus their full localized language and country names. 
 53          @rtype: list of tuples 
 54          """ 
 55          #Make a list of all the locales found in NVDA's locale dir 
 56          l=[x for x in os.listdir('locale') if not x.startswith('.')] 
 57          l=[x for x in l if os.path.isfile('locale/%s/LC_MESSAGES/nvda.mo'%x)] 
 58          #Make sure that en (english) is in the list as it may not have any locale files, but is default 
 59          if 'en' not in l: 
 60                  l.append('en') 
 61                  l.sort() 
 62          #For each locale, ask Windows for its human readable display name 
 63          d=[] 
 64          for i in l: 
 65                  desc=getLanguageDescription(i) 
 66                  label="%s, %s"%(desc,i) if desc else i 
 67                  d.append(label) 
 68          #include a 'user default, windows' language, which just represents the default language for this user account 
 69          l.append("Windows") 
 70          d.append("User default, windows") 
 71          #return a zipped up version of both the lists (a list with tuples of locale,label) 
 72          return zip(l,d) 
 73   
 74 -def setLanguage(lang): 
 75          global curLang 
 76          try: 
 77                  if lang=="Windows": 
 78                          windowsLCID=ctypes.windll.kernel32.GetUserDefaultUILanguage() 
 79                          localeName=locale.windows_locale[windowsLCID] 
 80                          gettext.translation('nvda',localedir='locale',languages=[localeName]).install(True) 
 81                          curLang=localeName 
 82                  else: 
 83                          gettext.translation("nvda", localedir="locale", languages=[lang]).install(True) 
 84                          curLang=lang 
 85                          localeChanged=False 
 86                          #Try setting Python's locale to lang 
 87                          try: 
 88                                  locale.setlocale(locale.LC_ALL,lang) 
 89                                  localeChanged=True 
 90                          except: 
 91                                  pass 
 92                          if not localeChanged and '_' in lang: 
 93                                  #Python couldn'tsupport the language_country locale, just try language. 
 94                                  try: 
 95                                          locale.setlocale(locale.LC_ALL,lang.split('_')[0]) 
 96                                  except: 
 97                                          pass 
 98                          #Set the windows locale for this thread (NVDA core) to this locale. 
 99                          LCID=localeNameToWindowsLCID(lang) 
100                          ctypes.windll.kernel32.SetThreadLocale(LCID) 
101                  config.conf["general"]["language"]=lang 
102                  return True 
103          except IOError: 
104                  gettext.install("nvda", unicode=True) 
105                  curLang="en" 
106                  return False 
107   
108 -def getLanguage(): 
109          return curLang 
110   
111 -def normalizeLanguage(lang): 
112          """ 
113          Normalizes a  language-dialect string  in to a standard form we can deal with. 
114          Converts  any dash to underline, and makes sure that language is lowercase and dialect is upercase. 
115          """ 
116          lang=lang.replace('-','_') 
117          ld=lang.split('_') 
118          ld[0]=ld[0].lower() 
119          #Filter out meta languages such as x-western 
120          if ld[0]=='x': 
121                  return None 
122          if len(ld)>=2: 
123                  ld[1]=ld[1].upper() 
124          return "_".join(ld) 
125