def _makeOne(self, family=None):
from zope.index.text.lexicon import Lexicon
from zope.index.text.lexicon import Splitter
if family is None:
family = self._getBTreesFamily()
lexicon = Lexicon(Splitter())
return self._getTargetClass()(lexicon, family=family)
def tfIdfBlock(self, data, field):
'''Creates TF/IDF canopy of a given set of data'''
class CustomStopWordRemover(object):
stop_words = self.stop_words[field].copy()
def process(self, lst):
return [w for w in lst if not w in self.stop_words]
index = TextIndex(Lexicon(Splitter(), CustomStopWordRemover()))
index.index = CosineIndex(index.lexicon)
index_to_id = {}
base_tokens = {}
for i, (record_id, doc) in enumerate(data, 1) :
index_to_id[i] = record_id
base_tokens[i] = doc
index.index_doc(i, doc)
canopies = (tfidf._createCanopies(index,
base_tokens,
threshold,
field)
for threshold in self.tfidf_fields[field])
for canopy in canopies :
key, index_canopy = canopy
id_canopy = dict((index_to_id[k], index_to_id[v])
for k,v in index_canopy.iteritems())
self.canopies[key] = defaultdict(str, id_canopy)
def _default_indexes():
return {
'title':
CatalogFieldIndex(get_title),
'description':
CatalogFieldIndex(get_description),
'type_name':
CatalogFieldIndex(get_type_name),
'sortable_title':
CatalogFieldIndex(get_sortable_title),
'path':
CatalogPathIndex(get_path),
'searchable_text':
CatalogTextIndex(get_searchable_text,
lexicon=Lexicon(Splitter(), CaseNormalizer())),
'uid':
CatalogFieldIndex(get_uid),
'tags':
CatalogKeywordIndex(get_tags),
'search_visible':
CatalogFieldIndex(get_search_visible),
'date':
CatalogFieldIndex(get_date),
'modified':
CatalogFieldIndex(get_modified),
'created':
CatalogFieldIndex(get_created),
'wf_state':
CatalogFieldIndex(get_wf_state),
'workflow':
CatalogFieldIndex(get_workflow),
}.items()
def _makeIndexAndParser(self):
from zope.index.text.lexicon import Lexicon
from zope.index.text.lexicon import Splitter
from zope.index.text.queryparser import QueryParser
lexicon = Lexicon(Splitter())
parser = QueryParser(lexicon)
index = FauxIndex()
return index, parser
def __init__(self, field, stop_words=[]):
self.field = field
splitter = Splitter()
stop_word_remover = CustomStopWordRemover(stop_words)
operator_escaper = OperatorEscaper()
lexicon = Lexicon(splitter, stop_word_remover, operator_escaper)
self._index = TextIndex(lexicon)
self._index.index = CosineIndex(self._index.lexicon)
self._i_to_id = {}
self._parseTerms = self._index.lexicon.parseTerms
def __init__(self, lexicon=None, index=None):
"""Provisional constructor.
This creates the lexicon and index if not passed in.
"""
_explicit_lexicon = True
if lexicon is None:
_explicit_lexicon = False
lexicon = Lexicon(Splitter(), CaseNormalizer(), StopWordRemover())
if index is None:
index = OkapiIndex(lexicon)
self.lexicon = _explicit_lexicon and lexicon or index.lexicon
self.index = index
def __init__(self, discriminator, lexicon=None, index=None):
_lexicon = lexicon
if lexicon is None:
_lexicon = Lexicon(
Splitter(),
CaseNormalizer(),
StopWordRemover(),
)
if index is None:
index = OkapiIndex(_lexicon, family=self.family)
super(TextIndex, self).__init__(discriminator, lexicon, index)
if lexicon is None:
self.lexicon = index.lexicon
self.index = index
self.clear()
def stopWords(data) :
index = TextIndex(Lexicon(Splitter()))
for i, (_, doc) in enumerate(data, 1) :
index.index_doc(i, doc)
doc_freq = [(len(index.index._wordinfo[wid]), word)
for word, wid in index.lexicon.items()]
doc_freq.sort(reverse=True)
N = float(index.index.documentCount())
threshold = int(max(1000, N * 0.05))
stop_words = set([])
for frequency, word in doc_freq :
if frequency > threshold :
stop_words.add(word)
else :
break
return stop_words
def _makeLexicon(self, *pipeline):
from zope.index.text.lexicon import Lexicon
from zope.index.text.lexicon import Splitter
if not pipeline:
pipeline = (Splitter(),)
return Lexicon(*pipeline)
def _makeLexicon(self):
from zope.index.text.lexicon import Lexicon
return Lexicon(*self._makePipeline())
def _create_full_text_index(self, language):
lexicon = Lexicon(
FullTextIndexProcessor(language, self.stemming)
)
return OkapiIndex(lexicon)
