Denote/denote/search.py
2016-01-17 18:48:14 +01:00

200 lines
5.9 KiB
Python
Executable File

# -*- coding: utf-8 -*-
"""
Copyright 2016 Grégory Soutadé
This file is part of Dénote.
Dynastie is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Dynastie is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Dynastie. If not, see <http://www.gnu.org/licenses/>.
"""
import re
import unicodedata
import os
import operator
import pickle
from django.db import models
import models
#from models import Note
class Search:
MINIMUM_LETTERS = 3
def __init__(self):
self.report = ''
self.tagreg = re.compile('<[^>]+>')
self.htmlreg = re.compile('&[^;]+;')
self.numreg = re.compile('[0-9]+')
self.pat = re.compile(r'\s+')
self.replace_by_space = (u'(', u')', u'#', u'\'', u'{', u'}', u'[', u']',
u'-', u'|', u'\t', u'\\', u'_', u'^' '=', u'+', u'$',
u'£', u'%', u'µ', u'*', u',', u'?', u';', u'.', u'/',
u':', u'!', u'§', u'', u'²')
# Imported from generator.py
def _addReport(self, string, color=''):
if color != '':
self.report = self.report + '<span style="color:' + color + '">'
self.report = self.report + '<b>' + self.__class__.__name__ + '</b> : '
self.report = self.report + string
if color != '':
self.report = self.report + '</span>'
self.report = self.report + '<br/>\n'
def _addWarning(self, string):
self.addReport(string, 'yellow')
def _addError(self, string):
self.addReport(string, 'red')
def _saveDatabase(self, hashtable):
d = pickle.dumps(hashtable)
f = open(os.environ['DENOTE_ROOT'] + '/_search.db', 'w')
f.write(d)
f.close()
def _loadDatabase(self):
filename = os.environ['DENOTE_ROOT'] + '/_search.db'
if not os.path.exists(filename):
print 'No search index !'
return {}
f = open(filename, 'rb')
hashtable = pickle.load(f)
f.close()
return hashtable
def _strip_accents(self, s):
return ''.join((c for c in unicodedata.normalize('NFD', s) if unicodedata.category(c) != 'Mn'))
def _remove_tag(self, content):
content = self.htmlreg.sub('', content)
content = self.numreg.sub('', content)
content = content.replace('\n', '')
content = content.replace('\r', '')
content = content.replace('"', '')
for c in self.replace_by_space:
content = content.replace(c, ' ')
content = self.tagreg.sub('', content)
content = self.pat.sub(' ', content)
return content
def _prepare_string(self, content):
content = self._remove_tag(content)
content = self._strip_accents(content)
return content
def _indexContent(self, hashtable, index, content, word_weight):
content = self._prepare_string(content)
wordlist = content.split(' ')
for word in wordlist:
if len(word) < self.MINIMUM_LETTERS:
continue
word = word.lower()
if not word in hashtable:
hashtable[word] = []
if not index in hashtable[word]:
hashtable[word].insert(0, [index, word_weight])
else:
weight = hashtable[word][1]
hashtable[word][1] = weight + word_weight
def _index(self, hashtable, index):
try:
note = Note.objects.get(pk=index)
except:
return
self._indexContent(hashtable, index, note.text, 1)
self._indexContent(hashtable, index, note.title.encode('utf-8'), 5)
def _index_note(self, note, saveDatabase=True):
hashtable = self._loadDatabase()
self._index(hashtable, int(note))
if saveDatabase:
self._saveDatabase(hashtable)
def _remove_note(self, note, saveDatabase=True):
hashtable = self._loadDatabase()
if hashtable is None: return
for k, v in hashtable.items():
# For tuples in values
for t in v:
if note == v[0]:
v.remove(t)
if saveDatabase:
self._saveDatabase(hashtable)
def generate_index(self, notes):
hashtable = self._loadDatabase()
for note in notes:
self._indexContent(hashtable, note.id, note.text, 1)
self._indexContent(hashtable, note.id, note.title, 5)
self._saveDatabase(hashtable)
def index_note(self, note):
return self._index_note(note, True)
def delete_note(self, note):
return self._remove_note(note, True)
def edit_note(self, note, saveDatabase=True):
self._remove_note(note, False)
self._index_note(note, True)
def search(self, string):
hashtable = self._loadDatabase()
string = self._prepare_string(string.encode('utf-8'))
wordlist = string.split(' ')
res = {}
for word in wordlist:
if len(word) < Search.MINIMUM_LETTERS:
continue
word = word.lower()
reg = re.compile('.*' + word + '.*')
for key in hashtable.keys():
if reg.match(key):
for note in hashtable[key]:
res[note[0]] = res.get(note[0],0) + note[1]
sorted_res = sorted(res.iteritems(), key=operator.itemgetter(1))
sorted_res.reverse()
res = [sorted_res[i][0] for i in range(len(sorted_res))]
return res