def compare_revisions(request, document_slug):
    """Compare two wiki document revisions.

    The ids are passed as query string parameters (to and from).

    """
    locale = request.GET.get('locale', request.locale)
    doc = get_object_or_404(
        Document, locale=locale, slug=document_slug)
    if 'from' not in request.GET or 'to' not in request.GET:
        raise Http404

    from_id = smart_int(request.GET.get('from'))
    to_id = smart_int(request.GET.get('to'))
    revision_from = get_object_or_404(Revision, document=doc, id=from_id)
    revision_to = get_object_or_404(Revision, document=doc, id=to_id)

    if request.is_ajax():
        template = 'wiki/includes/revision_diff.html'
    else:
        template = 'wiki/compare_revisions.html'

    return jingo.render(request, template,
                        {'document': doc, 'revision_from': revision_from,
                         'revision_to': revision_to})

def wiki_rows(request, readout_slug):
    """Return the table contents HTML for the given readout and mode."""
    readout = _kb_readout(
        request, readout_slug, READOUTS, locale=request.GET.get("locale"), mode=smart_int(request.GET.get("mode"), None)
    )
    max_rows = smart_int(request.GET.get("max"), fallback=None)
    return HttpResponse(readout.render(max_rows=max_rows))

def wiki_rows(request, readout_slug):
    """Return the table contents HTML for the given readout and mode."""
    product = _get_product(request)

    readout = _kb_readout(request, readout_slug, READOUTS,
                          locale=request.GET.get('locale'),
                          mode=smart_int(request.GET.get('mode'), None),
                          product=product)
    max_rows = smart_int(request.GET.get('max'), fallback=None)
    return HttpResponse(readout.render(max_rows=max_rows))

def helpful_vote(request, document_slug):
    """Vote for Helpful/Not Helpful document"""
    revision = get_object_or_404(
        Revision, id=smart_int(request.POST['revision_id']))

    if not revision.has_voted(request):
        ua = request.META.get('HTTP_USER_AGENT', '')[:1000]  # 1000 max_length
        vote = HelpfulVote(revision=revision, user_agent=ua)

        if 'helpful' in request.POST:
            vote.helpful = True
            message = _('Glad to hear it — thanks for the feedback!')
        else:
            message = _('Sorry to hear that. Try searching for solutions '
                        'below.')

        if request.user.is_authenticated():
            vote.creator = request.user
        else:
            vote.anonymous_id = request.anonymous.anonymous_id

        vote.save()
        statsd.incr('wiki.vote')
    else:
        message = _('You already voted on this Article.')

    if request.is_ajax():
        return HttpResponse(json.dumps({'message': message}))

    return HttpResponseRedirect(revision.document.get_absolute_url())

def helpful_vote(request, document_slug):
    """Vote for Helpful/Not Helpful document"""
    if 'revision_id' not in request.POST:
        return HttpResponseBadRequest()

    revision = get_object_or_404(
        Revision, id=smart_int(request.POST['revision_id']))
    survey = None

    if revision.document.category == TEMPLATES_CATEGORY:
        return HttpResponseBadRequest()

    if not revision.has_voted(request):
        ua = request.META.get('HTTP_USER_AGENT', '')[:1000]  # 1000 max_length
        vote = HelpfulVote(revision=revision, user_agent=ua)

        if 'helpful' in request.POST:
            vote.helpful = True
            message = _('Glad to hear it — thanks for the feedback!')
        else:
            message = _('Sorry to hear that.')

        # If user is over the limit, don't save but pretend everything is ok.
        if not request.limited:
            if request.user.is_authenticated():
                vote.creator = request.user
            else:
                vote.anonymous_id = request.anonymous.anonymous_id

            vote.save()
            statsd.incr('wiki.vote')

            # Send a survey if flag is enabled and vote wasn't helpful.
            if 'helpful' not in request.POST:
                survey = jingo.render_to_string(
                    request, 'wiki/includes/unhelpful_survey.html',
                    {'vote_id': vote.id})

            # Save vote metadata: referrer and search query (if available)
            for name in ['referrer', 'query', 'source']:
                val = request.POST.get(name)
                if val:
                    vote.add_metadata(name, val)
    else:
        message = _('You already voted on this Article.')

    if request.is_ajax():
        r = {'message': message}
        if survey:
            r.update(survey=survey)

        return HttpResponse(json.dumps(r))

    return HttpResponseRedirect(revision.document.get_absolute_url())

def unhelpful_survey(request):
    """Ajax only view: Unhelpful vote survey processing."""
    vote = get_object_or_404(HelpfulVote,
                             id=smart_int(request.POST.get('vote_id')))

    # The survey is the posted data, minus the vote_id and button value.
    survey = request.POST.copy()
    survey.pop('vote_id')
    survey.pop('button')

    # Save the survey in JSON format, taking care not to exceed 1000 chars.
    vote.add_metadata('survey', truncated_json_dumps(survey, 1000, 'comment'))

    return HttpResponse(
        json.dumps({'message': _('Thanks for making us better!')}))

def compare_revisions(request, document_slug):
    """Compare two wiki document revisions.

    The ids are passed as query string parameters (to and from).

    """
    locale = request.GET.get("locale", request.locale)
    doc = get_object_or_404(Document, locale=locale, slug=document_slug)
    if "from" not in request.GET or "to" not in request.GET:
        raise Http404

    from_id = smart_int(request.GET.get("from"))
    to_id = smart_int(request.GET.get("to"))
    revision_from = get_object_or_404(Revision, document=doc, id=from_id)
    revision_to = get_object_or_404(Revision, document=doc, id=to_id)

    if request.is_ajax():
        template = "wiki/includes/revision_diff.html"
    else:
        template = "wiki/compare_revisions.html"

    return jingo.render(
        request, template, {"document": doc, "revision_from": revision_from, "revision_to": revision_to}
    )

def helpful_vote(request, document_slug):
    """Vote for Helpful/Not Helpful document"""
    if "revision_id" not in request.POST:
        return HttpResponseBadRequest()

    revision = get_object_or_404(Revision, id=smart_int(request.POST["revision_id"]))

    if not revision.has_voted(request):
        ua = request.META.get("HTTP_USER_AGENT", "")[:1000]  # 1000 max_length
        vote = HelpfulVote(revision=revision, user_agent=ua)

        if "helpful" in request.POST:
            vote.helpful = True
            message = _("Glad to hear it — thanks for the feedback!")
        else:
            message = _("Sorry to hear that. Try searching for solutions " "below.")

        if request.user.is_authenticated():
            vote.creator = request.user
        else:
            vote.anonymous_id = request.anonymous.anonymous_id

        vote.save()
        statsd.incr("wiki.vote")

        # Save vote metadata: referrer and search query (if available)
        for name in ["referrer", "query"]:
            val = request.POST.get(name)
            if val:
                vote.add_metadata(name, val)
    else:
        message = _("You already voted on this Article.")

    if request.is_ajax():
        return HttpResponse(json.dumps({"message": message}))

    return HttpResponseRedirect(revision.document.get_absolute_url())

def search(request, template=None):
    """Performs search or displays the search form."""

    # JSON-specific variables
    is_json = (request.GET.get('format') == 'json')
    callback = request.GET.get('callback', '').strip()
    mimetype = 'application/x-javascript' if callback else 'application/json'

    # Search "Expires" header format
    expires_fmt = '%A, %d %B %Y %H:%M:%S GMT'

    # Check callback is valid
    if is_json and callback and not jsonp_is_valid(callback):
        return HttpResponse(
            json.dumps({'error': _('Invalid callback function.')}),
            mimetype=mimetype, status=400)

    language = locale_or_default(request.GET.get('language', request.locale))
    r = request.GET.copy()
    a = request.GET.get('a', '0')

    # Search default values
    try:
        category = map(int, r.getlist('category')) or \
                   settings.SEARCH_DEFAULT_CATEGORIES
    except ValueError:
        category = settings.SEARCH_DEFAULT_CATEGORIES
    r.setlist('category', category)

    # Basic form
    if a == '0':
        r['w'] = r.get('w', constants.WHERE_BASIC)
    # Advanced form
    if a == '2':
        r['language'] = language
        r['a'] = '1'

    # TODO: Rewrite so SearchForm is unbound initially and we can use `initial`
    # on the form fields.
    if 'include_archived' not in r:
        r['include_archived'] = False

    search_form = SearchForm(r)

    if not search_form.is_valid() or a == '2':
        if is_json:
            return HttpResponse(
                json.dumps({'error': _('Invalid search data.')}),
                mimetype=mimetype,
                status=400)

        t = template if request.MOBILE else 'search/form.html'
        search_ = jingo.render(request, t,
                               {'advanced': a, 'request': request,
                                'search_form': search_form})
        search_['Cache-Control'] = 'max-age=%s' % \
                                   (settings.SEARCH_CACHE_PERIOD * 60)
        search_['Expires'] = (datetime.utcnow() +
                              timedelta(
                                minutes=settings.SEARCH_CACHE_PERIOD)) \
                              .strftime(expires_fmt)
        return search_

    cleaned = search_form.cleaned_data

    page = max(smart_int(request.GET.get('page')), 1)
    offset = (page - 1) * settings.SEARCH_RESULTS_PER_PAGE

    # get language name for display in template
    lang = language.lower()
    if settings.LANGUAGES.get(lang):
        lang_name = settings.LANGUAGES[lang]
    else:
        lang_name = ''

    wiki_s = wiki_search
    question_s = question_search
    discussion_s = discussion_search

    documents = []

    # wiki filters
    # Category filter
    if cleaned['category']:
        wiki_s = wiki_s.filter(category__in=cleaned['category'])

    # Locale filter
    wiki_s = wiki_s.filter(locale=language)

    # Product filter
    products = cleaned['product']
    for p in products:
        wiki_s = wiki_s.filter(tag=p)

    # Tags filter
    tags = [t.strip() for t in cleaned['tags'].split()]
    for t in tags:
        wiki_s = wiki_s.filter(tag=t)

    # Archived bit
#.........这里部分代码省略.........

def search_with_es(request, template=None):
    """ES-specific search view"""

    engine = "elastic"

    # Time ES and Sphinx separate. See bug 723930.
    # TODO: Remove this once Sphinx is gone.
    start = time.time()

    # JSON-specific variables
    is_json = request.GET.get("format") == "json"
    callback = request.GET.get("callback", "").strip()
    mimetype = "application/x-javascript" if callback else "application/json"

    # Search "Expires" header format
    expires_fmt = "%A, %d %B %Y %H:%M:%S GMT"

    # Check callback is valid
    if is_json and callback and not jsonp_is_valid(callback):
        return HttpResponse(json.dumps({"error": _("Invalid callback function.")}), mimetype=mimetype, status=400)

    language = locale_or_default(request.GET.get("language", request.locale))
    r = request.GET.copy()
    a = request.GET.get("a", "0")

    # Search default values
    try:
        category = map(int, r.getlist("category")) or settings.SEARCH_DEFAULT_CATEGORIES
    except ValueError:
        category = settings.SEARCH_DEFAULT_CATEGORIES
    r.setlist("category", category)

    # Basic form
    if a == "0":
        r["w"] = r.get("w", constants.WHERE_BASIC)
    # Advanced form
    if a == "2":
        r["language"] = language
        r["a"] = "1"

    # TODO: Rewrite so SearchForm is unbound initially and we can use
    # `initial` on the form fields.
    if "include_archived" not in r:
        r["include_archived"] = False

    search_form = SearchForm(r)

    if not search_form.is_valid() or a == "2":
        if is_json:
            return HttpResponse(json.dumps({"error": _("Invalid search data.")}), mimetype=mimetype, status=400)

        t = template if request.MOBILE else "search/form.html"
        search_ = jingo.render(request, t, {"advanced": a, "request": request, "search_form": search_form})
        search_["Cache-Control"] = "max-age=%s" % (settings.SEARCH_CACHE_PERIOD * 60)
        search_["Expires"] = (datetime.utcnow() + timedelta(minutes=settings.SEARCH_CACHE_PERIOD)).strftime(expires_fmt)
        return search_

    cleaned = search_form.cleaned_data

    page = max(smart_int(request.GET.get("page")), 1)
    offset = (page - 1) * settings.SEARCH_RESULTS_PER_PAGE

    # TODO: This is fishy--why does it have to be coded this way?
    # get language name for display in template
    lang = language.lower()
    if settings.LANGUAGES.get(lang):
        lang_name = settings.LANGUAGES[lang]
    else:
        lang_name = ""

    wiki_s = Document.search()
    question_s = Question.search()
    discussion_s = Thread.search()

    # wiki filters
    # Category filter
    if cleaned["category"]:
        wiki_s = wiki_s.filter(document_category__in=cleaned["category"])

    # Locale filter
    wiki_s = wiki_s.filter(document_locale=language)

    # Product filter
    products = cleaned["product"]
    for p in products:
        wiki_s = wiki_s.filter(document_tag=p)

    # Tags filter
    tags = [t.strip() for t in cleaned["tags"].split()]
    for t in tags:
        wiki_s = wiki_s.filter(document_tag=t)

    # Archived bit
    if a == "0" and not cleaned["include_archived"]:
        # Default to NO for basic search:
        cleaned["include_archived"] = False
    if not cleaned["include_archived"]:
        wiki_s = wiki_s.filter(document_is_archived=False)
    # End of wiki filters

#.........这里部分代码省略.........

 def test_sanity(self):
     eq_(10, smart_int('10'))
     eq_(10, smart_int('10.5'))

 def test_large_values(self):
     """Makes sure ints that would cause an overflow result in fallback."""
     eq_(0, smart_int('1' * 1000))

 def test_wrong_type(self):
     eq_(0, smart_int(None))
     eq_(10, smart_int([], 10))

 def test_empty_string(self):
     eq_(0, smart_int(''))

 def test_int(self):
     eq_(10, smart_int(10))

def search(request, template=None):
    """Performs search or displays the search form."""

    # JSON-specific variables
    is_json = request.GET.get("format") == "json"
    callback = request.GET.get("callback", "").strip()
    mimetype = "application/x-javascript" if callback else "application/json"

    # Search "Expires" header format
    expires_fmt = "%A, %d %B %Y %H:%M:%S GMT"

    # Check callback is valid
    if is_json and callback and not jsonp_is_valid(callback):
        return HttpResponse(json.dumps({"error": _("Invalid callback function.")}), mimetype=mimetype, status=400)

    language = locale_or_default(request.GET.get("language", request.locale))
    r = request.GET.copy()
    a = request.GET.get("a", "0")

    # Search default values
    try:
        category = map(int, r.getlist("category")) or settings.SEARCH_DEFAULT_CATEGORIES
    except ValueError:
        category = settings.SEARCH_DEFAULT_CATEGORIES
    r.setlist("category", [x for x in category if x > 0])
    exclude_category = [abs(x) for x in category if x < 0]

    # Basic form
    if a == "0":
        r["w"] = r.get("w", constants.WHERE_BASIC)
    # Advanced form
    if a == "2":
        r["language"] = language
        r["a"] = "1"

    # TODO: Rewrite so SearchForm is unbound initially and we can use `initial`
    # on the form fields.
    if "include_archived" not in r:
        r["include_archived"] = False

    search_form = SearchForm(r)

    if not search_form.is_valid() or a == "2":
        if is_json:
            return HttpResponse(json.dumps({"error": _("Invalid search data.")}), mimetype=mimetype, status=400)

        t = template if request.MOBILE else "search/form.html"
        search_ = jingo.render(request, t, {"advanced": a, "request": request, "search_form": search_form})
        search_["Cache-Control"] = "max-age=%s" % (settings.SEARCH_CACHE_PERIOD * 60)
        search_["Expires"] = (datetime.utcnow() + timedelta(minutes=settings.SEARCH_CACHE_PERIOD)).strftime(expires_fmt)
        return search_

    cleaned = search_form.cleaned_data
    search_locale = (sphinx_locale(language),)

    page = max(smart_int(request.GET.get("page")), 1)
    offset = (page - 1) * settings.SEARCH_RESULTS_PER_PAGE

    # get language name for display in template
    lang = language.lower()
    if settings.LANGUAGES.get(lang):
        lang_name = settings.LANGUAGES[lang]
    else:
        lang_name = ""

    documents = []
    filters_w = []
    filters_q = []
    filters_f = []

    # wiki filters
    # Category filter
    if cleaned["category"]:
        filters_w.append({"filter": "category", "value": cleaned["category"]})

    if exclude_category:
        filters_w.append({"filter": "category", "value": exclude_category, "exclude": True})

    # Locale filter
    filters_w.append({"filter": "locale", "value": search_locale})

    # Product filter
    products = cleaned["product"]
    if products:
        for p in products:
            filters_w.append({"filter": "tag", "value": (crc32(p),)})

    # Tags filter
    tags = [crc32(t.strip()) for t in cleaned["tags"].split()]
    if tags:
        for t in tags:
            filters_w.append({"filter": "tag", "value": (t,)})

    # Archived bit
    if a == "0" and not cleaned["include_archived"]:
        # Default to NO for basic search:
        cleaned["include_archived"] = False
    if not cleaned["include_archived"]:
        filters_w.append({"filter": "is_archived", "value": (False,)})
    # End of wiki filters
#.........这里部分代码省略.........

def search_with_es_unified(request, template=None):
    """ES-specific search view"""

    # TODO: Remove this once elastic search bucketed code is gone.
    start = time.time()

    # JSON-specific variables
    is_json = (request.GET.get('format') == 'json')
    callback = request.GET.get('callback', '').strip()
    mimetype = 'application/x-javascript' if callback else 'application/json'

    # Search "Expires" header format
    expires_fmt = '%A, %d %B %Y %H:%M:%S GMT'

    # Check callback is valid
    if is_json and callback and not jsonp_is_valid(callback):
        return HttpResponse(
            json.dumps({'error': _('Invalid callback function.')}),
            mimetype=mimetype, status=400)

    language = locale_or_default(request.GET.get('language', request.locale))
    r = request.GET.copy()
    a = request.GET.get('a', '0')

    # Search default values
    try:
        category = (map(int, r.getlist('category')) or
                    settings.SEARCH_DEFAULT_CATEGORIES)
    except ValueError:
        category = settings.SEARCH_DEFAULT_CATEGORIES
    r.setlist('category', category)

    # Basic form
    if a == '0':
        r['w'] = r.get('w', constants.WHERE_BASIC)
    # Advanced form
    if a == '2':
        r['language'] = language
        r['a'] = '1'

    # TODO: Rewrite so SearchForm is unbound initially and we can use
    # `initial` on the form fields.
    if 'include_archived' not in r:
        r['include_archived'] = False

    search_form = SearchForm(r)

    if not search_form.is_valid() or a == '2':
        if is_json:
            return HttpResponse(
                json.dumps({'error': _('Invalid search data.')}),
                mimetype=mimetype,
                status=400)

        t = template if request.MOBILE else 'search/form.html'
        search_ = jingo.render(request, t,
                               {'advanced': a, 'request': request,
                                'search_form': search_form})
        search_['Cache-Control'] = 'max-age=%s' % \
                                   (settings.SEARCH_CACHE_PERIOD * 60)
        search_['Expires'] = (datetime.utcnow() +
                              timedelta(
                                minutes=settings.SEARCH_CACHE_PERIOD)) \
                              .strftime(expires_fmt)
        return search_

    cleaned = search_form.cleaned_data

    page = max(smart_int(request.GET.get('page')), 1)
    offset = (page - 1) * settings.SEARCH_RESULTS_PER_PAGE

    lang = language.lower()
    if settings.LANGUAGES.get(lang):
        lang_name = settings.LANGUAGES[lang]
    else:
        lang_name = ''

    # Woah! object?! Yeah, so what happens is that Sphilastic is
    # really an elasticutils.S and that requires a Django ORM model
    # argument. That argument only gets used if you want object
    # results--for every hit it gets back from ES, it creates an
    # object of the type of the Django ORM model you passed in. We use
    # object here to satisfy the need for a type in the constructor
    # and make sure we don't ever ask for object results.
    searcher = Sphilastic(object)

    wiki_f = F(model='wiki_document')
    question_f = F(model='questions_question')
    discussion_f = F(model='forums_thread')

    # Start - wiki filters

    if cleaned['w'] & constants.WHERE_WIKI:
        # Category filter
        if cleaned['category']:
            wiki_f &= F(document_category__in=cleaned['category'])

        # Locale filter
        wiki_f &= F(document_locale=language)

#.........这里部分代码省略.........

def search(request, template=None):
    """ES-specific search view"""

    if (waffle.flag_is_active(request, 'esunified') or
        request.GET.get('esunified')):
        return search_with_es_unified(request, template)

    start = time.time()

    # JSON-specific variables
    is_json = (request.GET.get('format') == 'json')
    callback = request.GET.get('callback', '').strip()
    mimetype = 'application/x-javascript' if callback else 'application/json'

    # Search "Expires" header format
    expires_fmt = '%A, %d %B %Y %H:%M:%S GMT'

    # Check callback is valid
    if is_json and callback and not jsonp_is_valid(callback):
        return HttpResponse(
            json.dumps({'error': _('Invalid callback function.')}),
            mimetype=mimetype, status=400)

    language = locale_or_default(request.GET.get('language', request.locale))
    r = request.GET.copy()
    a = request.GET.get('a', '0')

    # Search default values
    try:
        category = (map(int, r.getlist('category')) or
                    settings.SEARCH_DEFAULT_CATEGORIES)
    except ValueError:
        category = settings.SEARCH_DEFAULT_CATEGORIES
    r.setlist('category', category)

    # Basic form
    if a == '0':
        r['w'] = r.get('w', constants.WHERE_BASIC)
    # Advanced form
    if a == '2':
        r['language'] = language
        r['a'] = '1'

    # TODO: Rewrite so SearchForm is unbound initially and we can use
    # `initial` on the form fields.
    if 'include_archived' not in r:
        r['include_archived'] = False

    search_form = SearchForm(r)

    if not search_form.is_valid() or a == '2':
        if is_json:
            return HttpResponse(
                json.dumps({'error': _('Invalid search data.')}),
                mimetype=mimetype,
                status=400)

        t = template if request.MOBILE else 'search/form.html'
        search_ = jingo.render(request, t,
                               {'advanced': a, 'request': request,
                                'search_form': search_form})
        search_['Cache-Control'] = 'max-age=%s' % \
                                   (settings.SEARCH_CACHE_PERIOD * 60)
        search_['Expires'] = (datetime.utcnow() +
                              timedelta(
                                minutes=settings.SEARCH_CACHE_PERIOD)) \
                              .strftime(expires_fmt)
        return search_

    cleaned = search_form.cleaned_data

    page = max(smart_int(request.GET.get('page')), 1)
    offset = (page - 1) * settings.SEARCH_RESULTS_PER_PAGE

    lang = language.lower()
    if settings.LANGUAGES.get(lang):
        lang_name = settings.LANGUAGES[lang]
    else:
        lang_name = ''

    wiki_s = Document.search()
    question_s = Question.search()
    discussion_s = Thread.search()

    # wiki filters
    # Category filter
    if cleaned['category']:
        wiki_s = wiki_s.filter(document_category__in=cleaned['category'])

    # Locale filter
    wiki_s = wiki_s.filter(document_locale=language)

    # Product filter
    products = cleaned['product']
    for p in products:
        wiki_s = wiki_s.filter(document_tag=p)

    # Tags filter
    tags = [t.strip() for t in cleaned['tags'].split()]
    for t in tags:
#.........这里部分代码省略.........

def search(request):
    """Performs search or displays the search form."""

    # JSON-specific variables
    is_json = (request.GET.get('format') == 'json')
    callback = request.GET.get('callback', '').strip()
    mimetype = 'application/x-javascript' if callback else 'application/json'

    # Search "Expires" header format
    expires_fmt = '%A, %d %B %Y %H:%M:%S GMT'

    # Check callback is valid
    if is_json and callback and not jsonp_is_valid(callback):
        return HttpResponse(
            json.dumps({'error': _('Invalid callback function.')}),
            mimetype=mimetype, status=400)

    language = locale_or_default(request.GET.get('language', request.locale))
    r = request.GET.copy()
    a = request.GET.get('a', '0')

    # Search default values
    try:
        category = map(int, r.getlist('category')) or \
                   settings.SEARCH_DEFAULT_CATEGORIES
    except ValueError:
        category = settings.SEARCH_DEFAULT_CATEGORIES
    r.setlist('category', [x for x in category if x > 0])
    exclude_category = [abs(x) for x in category if x < 0]

    try:
        fx = map(int, r.getlist('fx')) or [v.id for v in FIREFOX_VERSIONS]
    except ValueError:
        fx = [v.id for v in FIREFOX_VERSIONS]
    #r.setlist('fx', fx)

    try:
        os = map(int, r.getlist('os')) or [o.id for o in OPERATING_SYSTEMS]
    except ValueError:
        os = [o.id for o in OPERATING_SYSTEMS]
    #r.setlist('os', os)

    # Basic form
    if a == '0':
        r['w'] = r.get('w', constants.WHERE_BASIC)
    # Advanced form
    if a == '2':
        r['language'] = language
        r['a'] = '1'

    search_form = SearchForm(r)

    if not search_form.is_valid() or a == '2':
        if is_json:
            return HttpResponse(
                json.dumps({'error': _('Invalid search data.')}),
                mimetype=mimetype,
                status=400)

        search_ = jingo.render(request, 'search/form.html',
                            {'advanced': a, 'request': request,
                             'search_form': search_form})
        search_['Cache-Control'] = 'max-age=%s' % \
                                   (settings.SEARCH_CACHE_PERIOD * 60)
        search_['Expires'] = (datetime.utcnow() +
                              timedelta(
                                minutes=settings.SEARCH_CACHE_PERIOD)) \
                              .strftime(expires_fmt)
        return search_

    cleaned = search_form.cleaned_data
    search_locale = (sphinx_locale(language),)

    page = max(smart_int(request.GET.get('page')), 1)
    offset = (page - 1) * settings.SEARCH_RESULTS_PER_PAGE

    # get language name for display in template
    lang = language.lower()
    if settings.LANGUAGES.get(lang):
        lang_name = settings.LANGUAGES[lang]
    else:
        lang_name = ''

    documents = []
    filters_w = []
    filters_q = []
    filters_f = []

    # wiki filters
    # Version and OS filters
    if cleaned['fx']:
        filters_w.append({
            'filter': 'fx',
            'value': cleaned['fx'],
        })

    if cleaned['os']:
        filters_w.append({
            'filter': 'os',
            'value': cleaned['os'],
#.........这里部分代码省略.........

 def test_invalid_string(self):
     eq_(0, smart_int('invalid'))