[Zope] Pre-indexing filter and accented letters (mostly solved)

[Yuri]

ZCTextindex to search and catalog accented words as non accented.

- Step 1
 
Add to Lexicon.py (around line 190) this code, which filters the things 
in the pipeline:

---

class RemoveAccented:

   def filter_word(self, w):
       """ filter the non ascii letters to ascii"""

       # trasformo la stringa w in unicode...
       parola = unicode(w,'latin-1')

       xlate={0xc0:'A', 0xc1:'A', 0xc2:'A', 0xc3:'A', 0xc4:'A', 0xc5:'A',
       0xc6:'Ae', 0xc7:'C',
       0xc8:'E', 0xc9:'E', 0xca:'E', 0xcb:'E',
       0xcc:'I', 0xcd:'I', 0xce:'I', 0xcf:'I',
       0xd0:'Th', 0xd1:'N',
       0xd2:'O', 0xd3:'O', 0xd4:'O', 0xd5:'O', 0xd6:'O', 0xd8:'O',
       0xd9:'U', 0xda:'U', 0xdb:'U', 0xdc:'U',
       0xdd:'Y', 0xde:'th', 0xdf:'ss',
       0xe0:'a', 0xe1:'a', 0xe2:'a', 0xe3:'a', 0xe4:'a', 0xe5:'a',
       0xe6:'ae', 0xe7:'c',
       0xe8:'e', 0xe9:'e', 0xea:'e', 0xeb:'e',
       0xec:'i', 0xed:'i', 0xee:'i', 0xef:'i',
       0xf0:'th', 0xf1:'n',
       0xf2:'o', 0xf3:'o', 0xf4:'o', 0xf5:'o', 0xf6:'o', 0xf8:'o',
       0xf9:'u', 0xfa:'u', 0xfb:'u', 0xfc:'u',
       0xfd:'y', 0xfe:'th', 0xff:'y',
       0xa1:'!', 0xa2:'{cent}', 0xa3:'{pound}', 0xa4:'{currency}',
       0xa5:'{yen}', 0xa6:'|', 0xa7:'{section}', 0xa8:'{umlaut}',
       0xa9:'{C}', 0xaa:'{^a}', 0xab:'<<', 0xac:'{not}',
       0xad:'-', 0xae:'{R}', 0xaf:'_', 0xb0:'{degrees}',
       0xb1:'{+/-}', 0xb2:'{^2}', 0xb3:'{^3}', 0xb4:"'",
       0xb5:'{micro}', 0xb6:'{paragraph}', 0xb7:'*', 0xb8:'{cedilla}',
       0xb9:'{^1}', 0xba:'{^o}', 0xbb:'>>',
       0xbc:'{1/4}', 0xbd:'{1/2}', 0xbe:'{3/4}', 0xbf:'?',
       0xd7:'*', 0xf7:'/'
       }

       r = ''
       for i in parola:
           if xlate.has_key(ord(i)):
               r += xlate[ord(i)]
           elif
               r += str(i)

       return r


   def process(self, lst):
       return [self.filter_word(w) for w in lst]

element_factory.registerFactory('Remove Accented',
                               'Remove Accented',
                               RemoveAccented)

---

Step 2

 Add the locale support for a latin-1 language, I added -L it_IT to zope 
start (in 2.7 you have to enable it in etc/zope.conf)

 Then you can search for "aççented" and find "accented" ;-)