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    1: """
    2: CDLI word and grapheme splitter
    3: """
    4: 
    5: from Products.ZCTextIndex.PipelineFactory import element_factory
    6: 
    7: import re
    8: import logging
    9: 
   10: def getSupportedEncoding(encodings):
   11:     for encoding in encodings:
   12:         try:
   13:             unicode('A', encoding)
   14:             return encoding
   15:         except:
   16:             pass
   17:     return 'utf-8'
   18: 
   19: 
   20: 
   21: """beta of a fulltext splitter for cdli
   22: 
   23: """
   24: ignoreLines=['$','@','#','&','>']
   25: separators=['']
   26: # kommas relevant for graphemes will not be deleted
   27: komma_exception="([^sStThH])," 
   28: # grapheme boundaries
   29: #graphemeBounds="\{|\}|<|>|\(|\)|-|_|\#|,|\||\]|\[|\!|\?"
   30: graphemeBounds="\{|\}|<|>|-|_|\#|,|\]|\[|\!|\?|\""
   31: graphemeIgnore=""
   32: # for words 
   33: #wordBounds="<|>|\(|\)|_|\#|,|\||\]|\[|\!|\?"
   34: wordBounds="_|,|\""
   35: wordIgnore="<|>|\#|\||\]|\[|\!|\?"
   36:            
   37: class cdliSplitter:
   38:     """base class for splitter. 
   39:     the difference between word and grapheme splitter 
   40:     is the word boundary list."""
   41:     
   42:     default_encoding = "utf-8"
   43:     bounds=graphemeBounds
   44:     ignore=graphemeIgnore
   45:     indexName="cdliSplitter"
   46:     
   47:     
   48:     def process(self, lst):
   49:         """gets a list of strings and returns a list of words"""
   50:         
   51:         logging.debug("cdliSplitter: %s"%self.indexName) 
   52:         result = []
   53:         pNum=None
   54:         lineNum=None
   55:     
   56:         for t in lst:
   57:             # normalise line breaks
   58:             t.replace("\r","\n")
   59:             # split lines
   60:             for s in t.split("\n"):
   61:                 if isinstance(s, str): 
   62:                     # not unicode
   63:                     s = unicode(s, self.default_encoding, 'replace')
   64:          
   65:                 if (s!=''):
   66:                     if s[0]=='&': 
   67:                         # store pNum
   68:                         pNum=s[1:8]
   69:                         logging.debug("%s processing: %s"%(self.indexName,pNum))
   70:                         
   71:                     elif not (s[0] in ignoreLines):
   72:                         # regular line
   73:                         lineparts=s.split(".")
   74:                         if len(lineparts)==1: 
   75:                             # no line number
   76:                             txt=s
   77:                         else:
   78:                             #store line number
   79:                             txt=lineparts[1]
   80:                             lineNum=lineparts[0] 
   81:                             
   82:                         # delete kommata except kommata relevant for graphemes
   83:                         txt = re.sub(komma_exception,r"\1",txt)
   84:                         # replace letters to be ignored
   85:                         txt = re.sub(self.ignore,'',txt)
   86:                         # replace word boundaries by spaces
   87:                         txt = re.sub(self.bounds,' ',txt)
   88:                         # split words
   89:                         words = txt.split(" ")
   90:                         for w in words:
   91:                             w=w.strip()
   92:                             if not (w==''):
   93:                                 result.append(w)
   94: 
   95:         #logging.debug("split '%s' into %s"%(lst,repr(result)))
   96:         return result
   97: 
   98: 
   99: class graphemeSplitter(cdliSplitter):
  100:     bounds=graphemeBounds
  101:     ignore=graphemeIgnore
  102:     indexName="graphemeSplitter"
  103:     
  104: class wordSplitter(cdliSplitter):
  105:     bounds=wordBounds
  106:     ignore=wordIgnore
  107:     indexName="wordSplitter"
  108:       
  109: try:
  110:     element_factory.registerFactory('Word Splitter',
  111:           'CDLI grapheme splitter', graphemeSplitter)
  112: except:
  113:     # in case the splitter is already registered, ValueError is raised
  114:     pass
  115: 
  116: try:
  117:     element_factory.registerFactory('Word Splitter',
  118:           'CDLI word splitter', wordSplitter)
  119: except:
  120:     # in case the splitter is already registered, ValueError is raised
  121:     pass
  122: