-# ==========
-# = Search =
-# ==========
-
-def _no_diacritics_regexp(query):
- """ returns a regexp for searching for a query without diacritics
-
- should be locale-aware """
- 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 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 """
- s = list(query)
- for i, c in enumerate(query):
- if re.match(r'(?u)(\W)', c) and re.match(r'[\x00-\x7e]', c):
- if c == "\000":
- s[i] = "\\000"
- else:
- s[i] = "\\" + c
- return query[:0].join(s)
-
-
-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 = {}
-
- 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
-
- return Q(**kwargs)
-
-
-def _word_starts_with_regexp(prefix):
- prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
- return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
-
-
-def _sqlite_word_starts_with(name, prefix):
- """ version of _word_starts_with for SQLite
-
- SQLite in Django uses Python re module
- """
- kwargs = {'%s__iregex' % name: _word_starts_with_regexp(prefix)}
- return Q(**kwargs)
-
-
-if hasattr(settings, 'DATABASES'):
- if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
- _word_starts_with = _sqlite_word_starts_with
-elif settings.DATABASE_ENGINE == 'sqlite3':
- _word_starts_with = _sqlite_word_starts_with
-
-
-class App:
- def __init__(self, name, view):
- self.name = name
- self._view = view
- self.lower = name.lower()
- self.category = 'application'
-
- def view(self):
- return reverse(*self._view)
-
-_apps = (
- App(u'Leśmianator', (u'lesmianator', )),
- )
-
-
-def _tags_starting_with(prefix, user=None):
- prefix = prefix.lower()
- # PD counter
- book_stubs = BookStub.objects.filter(_word_starts_with('title', prefix))
- authors = Author.objects.filter(_word_starts_with('name', prefix))
-
- books = Book.objects.filter(_word_starts_with('title', prefix))
- tags = Tag.objects.filter(_word_starts_with('name', prefix))
- if user and user.is_authenticated():
- tags = tags.filter(~Q(category='set') | Q(user=user))
- else:
- tags = tags.exclude(category='set')
-
- prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
- return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + \
- list(authors)
-
-
-def _get_result_link(match, tag_list):
- if isinstance(match, Tag):
- return reverse('catalogue.views.tagged_object_list',
- kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])})
- elif isinstance(match, App):
- return match.view()
- else:
- return match.get_absolute_url()
-
-
-def _get_result_type(match):
- if isinstance(match, Book) or isinstance(match, BookStub):
- match_type = 'book'
- else:
- match_type = match.category
- return match_type
-
-
-def books_starting_with(prefix):
- prefix = prefix.lower()
- return Book.objects.filter(_word_starts_with('title', prefix))
-
-
-def find_best_matches(query, user=None):
- """ Finds a Book, Tag, BookStub or Author 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))
- # remove pdcounter stuff
- book_titles = set(match.pretty_title().lower() for match in result
- if isinstance(match, Book))
- authors = set(match.name.lower() for match in result
- if isinstance(match, Tag) and match.category == 'author')
- result = tuple(res for res in result if not (
- (isinstance(res, BookStub) and res.pretty_title().lower() in book_titles) or
- (isinstance(res, Author) and res.name.lower() in authors)
- ))
-
- exact_matches = tuple(res for res in result if res.name.lower() == query)
- if exact_matches:
- return exact_matches
- else:
- return tuple(result)[:1]
-
-
-def search(request):
- tags = request.GET.get('tags', '')
- prefix = request.GET.get('q', '')
-
- try:
- tag_list = Tag.get_tag_list(tags)
- except (Tag.DoesNotExist, Tag.MultipleObjectsReturned, Tag.UrlDeprecationWarning):
- tag_list = []
-
- 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))
-
- 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))
- else:
- form = PublishingSuggestForm(initial={"books": prefix + ", "})
- return render_to_response(
- 'catalogue/search_no_hits.html',
- {'tags': tag_list, 'prefix': prefix, "pubsuggest_form": form},
- context_instance=RequestContext(request))
-
-
-def tags_starting_with(request):
- prefix = request.GET.get('q', '')
- # Prefix must have at least 2 characters
- if len(prefix) < 2:
- return HttpResponse('')
- tags_list = []
- result = ""
- for tag in _tags_starting_with(prefix, request.user):
- if tag.name not in tags_list:
- result += "\n" + tag.name
- tags_list.append(tag.name)
- return HttpResponse(result)
-
-
-def json_tags_starting_with(request, callback=None):
- # Callback for JSONP
- prefix = request.GET.get('q', '')
- callback = request.GET.get('callback', '')
- # Prefix must have at least 2 characters
- if len(prefix) < 2:
- return HttpResponse('')
- tags_list = []
- for tag in _tags_starting_with(prefix, request.user):
- if tag.name not in tags_list:
- tags_list.append(tag.name)
- if request.GET.get('mozhint', ''):
- result = [prefix, tags_list]
- else:
- result = {"matches": tags_list}
- response = JsonResponse(result, safe=False)
- if callback:
- response.content = callback + "(" + response.content + ");"
- return response
-
-
fnp / wolnelektury.git / blobdiff