book/picture-only tags
[wolnelektury.git] / src / search / views.py
1 # -*- coding: utf-8 -*-
2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
4 #
5 from django.conf import settings
6 from django.shortcuts import render_to_response
7 from django.template import RequestContext
8 from django.views.decorators import cache
9 from django.http import HttpResponse, JsonResponse
10
11 from catalogue.utils import split_tags
12 from catalogue.models import Book, Tag
13 from search.index import Search, SearchResult
14 from suggest.forms import PublishingSuggestForm
15 import re
16 import json
17
18 from wolnelektury.utils import re_escape
19
20
21 def match_word_re(word):
22     if 'sqlite' in settings.DATABASES['default']['ENGINE']:
23         return r"\b%s\b" % word
24     elif 'mysql' in settings.DATABASES['default']['ENGINE']:
25         return "[[:<:]]%s[[:>:]]" % word
26
27
28 query_syntax_chars = re.compile(r"[\\/*:(){}]")
29
30
31 def remove_query_syntax_chars(query, replace=' '):
32     return query_syntax_chars.sub(replace, query)
33
34
35 def did_you_mean(query, tokens):
36     return query
37     # change = {}
38     # for t in tokens:
39     #     authors = Tag.objects.filter(category='author', name__iregex=match_word_re(t))
40     #     if len(authors) > 0:
41     #         continue
42
43     #     if False:
44     #         if not dictionary.check(t):
45     #             try:
46     #                 change_to = dictionary.suggest(t)[0].lower()
47     #                 if change_to != t.lower():
48     #                     change[t] = change_to
49     #             except IndexError:
50     #                 pass
51
52     # if change == {}:
53     #     return None
54
55     # for frm, to in change.items():
56     #     query = query.replace(frm, to)
57
58     # return query
59
60
61 @cache.never_cache
62 def hint(request):
63     prefix = request.GET.get('term', '')
64     if len(prefix) < 2:
65         return JsonResponse([], safe=False)
66
67     prefix = re_escape(' '.join(remove_query_syntax_chars(prefix).split()))
68
69     try:
70         limit = int(request.GET.get('max', ''))
71     except ValueError:
72         limit = 20
73     else:
74         if limit < 1:
75             limit = 20
76
77     authors = Tag.objects.filter(
78         category='author', name_pl__iregex='\m' + prefix).only('name', 'id', 'slug', 'category')
79     data = [
80         {
81             'label': author.name,
82             'id': author.id,
83             'url': author.get_absolute_url(),
84         }
85         for author in authors[:limit]
86     ]
87     if len(data) < limit:
88         data += [
89             {
90                 'label': '<cite>%s</cite>, %s' % (b.title, b.author_unicode()),
91                 'id': b.id,
92                 'url': b.get_absolute_url()
93             }
94             for b in Book.objects.filter(title__iregex='\m' + prefix)[:limit-len(data)]
95         ]
96     callback = request.GET.get('callback', None)
97     if callback:
98         return HttpResponse("%s(%s);" % (callback, json.dumps(data)),
99                             content_type="application/json; charset=utf-8")
100     else:
101         return JsonResponse(data, safe=False)
102
103
104 @cache.never_cache
105 def main(request):
106     query = request.GET.get('q', '')
107     query = ' '.join(query.split())
108     # filter out private use characters
109     import unicodedata
110     query = ''.join(ch for ch in query if unicodedata.category(ch) != 'Co')
111
112     if len(query) < 2:
113         return render_to_response(
114             'catalogue/search_too_short.html', {'prefix': query},
115             context_instance=RequestContext(request))
116     elif len(query) > 256:
117         return render_to_response(
118             'catalogue/search_too_long.html', {'prefix': query}, context_instance=RequestContext(request))
119
120     query = remove_query_syntax_chars(query)
121
122     words = query.split()
123     if len(words) > 10:
124         query = ' '.join(words[:10])
125
126     search = Search()
127
128     tags = search.hint_tags(query, pdcounter=True, prefix=False)
129     tags = split_tags(tags)
130
131     results_parts = []
132
133     search_fields = []
134     fieldsets = (
135         (['authors'], True),
136         (['title'], True),
137         (['metadata'], True),
138         (['text', 'themes_pl'], False),
139     )
140     for fieldset, is_book in fieldsets:
141         search_fields += fieldset
142         results_parts.append(search.search_words(words, search_fields, book=is_book))
143
144     results = []
145     ids_results = {}
146     for results_part in results_parts:
147         for result in sorted(SearchResult.aggregate(results_part), reverse=True):
148             book_id = result.book_id
149             if book_id in ids_results:
150                 ids_results[book_id].merge(result)
151             else:
152                 results.append(result)
153                 ids_results[book_id] = result
154
155     for result in results:
156         search.get_snippets(result, query, num=3)
157
158     suggestion = u''
159
160     def ensure_exists(r):
161         try:
162             return r.book
163         except Book.DoesNotExist:
164             return False
165
166     results = filter(ensure_exists, results)
167
168     if not results:
169         form = PublishingSuggestForm(initial={"books": query + ", "})
170         return render_to_response(
171             'catalogue/search_no_hits.html',
172             {
173                 'tags': tags,
174                 'prefix': query,
175                 'form': form,
176                 'did_you_mean': suggestion
177             },
178             context_instance=RequestContext(request))
179
180     return render_to_response(
181         'catalogue/search_multiple_hits.html',
182         {
183             'tags': tags['author'] + tags['kind'] + tags['genre'] + tags['epoch'] + tags['theme'],
184             'prefix': query,
185             'results': results,
186             'did_you_mean': suggestion
187         },
188         context_instance=RequestContext(request))