""" returns a regexp for searching for a query without diacritics
should be locale-aware """
- names = {'a':u'ą', 'c':u'ć', 'e':u'ę', 'l': u'ł', 'n':u'ń', 'o':u'ó', 's':u'ś', 'z':u'ź|ż'}
+ names = {
+ u'a':u'aąĄ', u'c':u'cćĆ', u'e':u'eęĘ', u'l': u'lłŁ', u'n':u'nńŃ', u'o':u'oóÓ', u's':u'sśŚ', u'z':u'zźżŹŻ',
+ u'ą':u'ąĄ', u'ć':u'ćĆ', u'ę':u'ęĘ', u'ł': u'łŁ', u'ń':u'ńŃ', u'ó':u'óÓ', u'ś':u'śŚ', u'ź':u'źŹ', u'ż':u'żŻ'
+ }
def repl(m):
l = m.group()
- return "(%s|%s)" % (l, names[l])
- return re.sub('[%s]'%(''.join(names.keys())), repl, query)
+ return u"(%s)" % '|'.join(names[l])
+ return re.sub(u'[%s]'%(u''.join(names.keys())), repl, query)
+
+def unicode_re_escape(query):
+ """ Unicode-friendly version of re.escape """
+ return re.sub('(?u)(\W)', r'\\\1', query)
def _word_starts_with(name, prefix):
"""returns a Q object getting models having `name` contain a word
starting with `prefix`
+
+ We define word characters as alphanumeric and underscore, like in JS.
+
+ Works for MySQL, PostgreSQL, Oracle.
+ For SQLite, _sqlite* version is substituted for this.
"""
kwargs = {}
- if settings.DATABASE_ENGINE in ('mysql', 'postgresql_psycopg2', 'postgresql'):
- prefix = _no_diacritics_regexp(re.escape(prefix))
- # we could use a [[:<:]] (word start),
- # but we want both `xy` and `(xy` to catch `(xyz)`
- kwargs['%s__iregex' % name] = u"(^|[^[:alpha:]])%s" % prefix
- else:
- # don't know how to do a generic regex
- # checking for simple icontain instead
- kwargs['%s__icontains' % name] = prefix
+
+ prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
+ # can't use [[:<:]] (word start),
+ # but we want both `xy` and `(xy` to catch `(xyz)`
+ kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
+ print kwargs['%s__iregex' % name]
+
return Q(**kwargs)
+
+def _sqlite_word_starts_with(name, prefix):
+ """ version of _word_starts_with for SQLite
+
+ SQLite in Django uses Python re module
+ """
+ kwargs = {}
+ prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
+ kwargs['%s__iregex' % name] = ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
+ return Q(**kwargs)
-def _tags_exact_matches(prefix, user):
- book_stubs = models.BookStub.objects.filter(title__iexact = prefix)
- books = models.Book.objects.filter(title__iexact = prefix)
- book_stubs = filter(lambda x: x not in books, book_stubs)
- tags = models.Tag.objects.filter(name__iexact = prefix)
- if user.is_authenticated():
- tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
- else:
- tags = tags.filter(~Q(category='book') & ~Q(category='set'))
- return list(books) + list(tags) + list(book_stubs)
+if settings.DATABASE_ENGINE == 'sqlite3':
+ _word_starts_with = _sqlite_word_starts_with
def _tags_starting_with(prefix, user):
+ prefix = prefix.lower()
book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
books = models.Book.objects.filter(_word_starts_with('title', prefix))
book_stubs = filter(lambda x: x not in books, book_stubs)
+def find_best_matches(query, user):
+ """ Finds a Book, Tag or Bookstub best matching a query.
+
+ Returns a with:
+ - zero elements when nothing is found,
+ - one element when a best result is found,
+ - more then one element on multiple exact matches
+
+ Raises a ValueError on too short a query.
+ """
+
+ query = query.lower()
+ if len(query) < 2:
+ raise ValueError("query must have at least two characters")
+
+ result = tuple(_tags_starting_with(query, user))
+ exact_matches = tuple(res for res in result if res.name.lower() == query)
+ if exact_matches:
+ return exact_matches
+ else:
+ return result[:1]
+
+
def search(request):
tags = request.GET.get('tags', '')
prefix = request.GET.get('q', '')
tag_list = models.Tag.get_tag_list(tags)
except:
tag_list = []
-
- # Prefix must have at least 2 characters
- if len(prefix) < 2:
+
+ try:
+ result = find_best_matches(prefix, request.user)
+ except ValueError:
return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
context_instance=RequestContext(request))
-
- result = _tags_exact_matches(prefix, request.user)
-
- if len(result) > 1:
- # multiple exact matches
+
+ if len(result) == 1:
+ return HttpResponseRedirect(_get_result_link(result[0], tag_list))
+ elif len(result) > 1:
return render_to_response('catalogue/search_multiple_hits.html',
{'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
context_instance=RequestContext(request))
-
- if not result:
- # no exact matches
- result = _tags_starting_with(prefix, request.user)
-
- if result:
- return HttpResponseRedirect(_get_result_link(result[0], tag_list))
else:
return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
context_instance=RequestContext(request))
fnp / wolnelektury.git / blobdiff