def editable(parsed, context, token):
    """
    Add the required HTML to the parsed content for in-line editing, such as
    the icon and edit form if the object is deemed to be editable - either it
    has an ``editable`` method which returns ``True``, or the logged in user
    has change permissions for the model.
    """
    def parse_field(field):
        field = field.split(".")
        obj = context[field.pop(0)]
        attr = field.pop()
        while field:
            obj = getattr(obj, field.pop(0))
        return obj, attr

    fields = [parse_field(f) for f in token.split_contents()[1:]]
    if fields:
        fields = [f for f in fields if len(f) == 2 and f[0] is fields[0][0]]
    if not parsed.strip():
        try:
            parsed = "".join([unicode(getattr(*field)) for field in fields])
        except AttributeError:
            pass
    if fields and "request" in context:
        obj = fields[0][0]
        if isinstance(obj, Model) and is_editable(obj, context["request"]):
            field_names = ",".join([f[1] for f in fields])
            context["form"] = get_edit_form(obj, field_names)
            context["original"] = parsed
            t = get_template("includes/editable_form.html", context)
            return t.render(Context(context))
    return parsed

def edit(request):
    """
    Process the inline editing form.
    """
    model = get_model(request.POST["app"], request.POST["model"])
    obj = model.objects.get(id=request.POST["id"])
    form = get_edit_form(obj, request.POST["fields"], data=request.POST,
                        files=request.FILES)
    if not is_editable(obj, request):
        response = "Permission denied"
    elif form.is_valid():
        form.save()
        response = ""
    else:
        response = form.errors.values()[0][0]
    return HttpResponse(unicode(response))

def edit(request):
    """
    Process the inline editing form.
    """
    model = get_model(request.POST["app"], request.POST["model"])
    obj = model.objects.get(id=request.POST["id"])
    form = get_edit_form(obj, request.POST["fields"], data=request.POST, files=request.FILES)
    if not is_editable(obj, request):
        response = _("Permission denied")
    elif form.is_valid():
        form.save()
        model_admin = ModelAdmin(model, admin.site)
        message = model_admin.construct_change_message(request, form, None)
        model_admin.log_change(request, obj, message)
        response = ""
    else:
        response = form.errors.values()[0][0]
    return HttpResponse(unicode(response))

def widget_list(request):
    """
    Renders widget options based on supplied widget
    class or displays a select screen
    """
    data = {}
    if not is_editable(Widget(), request):
        response = _("Permission denied")
        data = {
            'error': [response],
            'permission': False
        }
    else:
        if request.POST:
            "widget class exists so render widget options if any"
            ctx = RequestContext(request)
            widget_form = WidgetForm(request.POST)
            widget_class = request.POST["widget_class"]
            widget_class_obj = get_widget(widget_class)

#            if hasattr(widget_class_obj, "options"):
            "Widget has options, lets generate the options form"
            options_form = WidgetOptionsForm(widget_class)
            if widget_form.is_valid():
                o = get_template("widget/options.html")
                ctx.update({'options_form': options_form,
                            'widget_class': widget_class_obj })

                options = o.render(ctx)
                data = {'valid': False, 'type':'fi', 'data':options}
            else:
                data = ajaxerror(widget_form)
            return HttpResponse(json_serializer.encode(data), mimetype='application/json')

        else:
            return HttpResponseRedirect("/")

def create_widget(request, **kwargs):
    """
    Renders widget options based on supplied widget
    class or displays a select screen
    """
    data = {}
    if not is_editable(Widget(), request):
        response = _("Permission denied")
        data = {
            'error': {"_all_": [response]},
            'permission': False
        }
    else:
        if request.POST:
            widget_class = request.POST["widget_class"]
            slot = request.POST["widgetslot"]
            try:
                page_obj = Page.objects.published(request.user)\
                                .get(id=request.POST["page"])
                options_form = WidgetOptionsForm(widget_class, request.POST)
                if options_form.is_valid():
                    try:
                        "update widget if it exists"
                        widget = Widget.objects.get(id=request.POST["widget"])
                    except Exception:
                        widget = Widget(widgetslot=slot, page=page_obj,
                                        widget_class=widget_class,
                                        user=request.user)
                        widget.save()

                    if options_form.save(widget=widget):
                        data = {'valid': True, 'form': 'saved'}
                elif options_form.errors:
                    data = ajaxerror(options_form)
            except Exception, e:
                data = {"valid": "false", "error": { "_all_": ["Something went wrong, please refresh the page"],}}