1 from django import template
2 from django.conf import settings
3 from django.utils.safestring import SafeUnicode, mark_safe
4 from django.core.exceptions import ObjectDoesNotExist
5 from django.contrib.contenttypes.models import ContentType
8 register = template.Library()
11 class ContainerNode(template.Node):
12 child_nodelists = ('nodelist_main', 'nodelist_empty',)
14 def __init__(self, name, references=None, as_var=None, nodelist_main=None, nodelist_empty=None):
17 self.references = references
19 if nodelist_main is None:
20 self.nodelist_main = template.NodeList()
22 self.nodelist_main = nodelist_main
24 if nodelist_empty is None:
25 self.nodelist_empty = template.NodeList()
27 self.nodelist_empty = nodelist_empty
29 def render(self, context):
30 content = settings.TEMPLATE_STRING_IF_INVALID
32 container_content = self.get_container_content(context['page'])
34 if self.nodelist_main is None:
36 if container_content and self.as_var:
37 context[self.as_var] = container_content
39 return container_content
42 if self.as_var is None:
43 self.as_var = self.name
45 context[self.as_var] = container_content
46 return nodelist_main.render(context)
48 if nodelist_empty is not None:
49 return nodelist_empty.render(context)
53 def get_container_content(self, page):
56 contentreference = page.contentreferences.get(name__exact=self.name, content_type=self.references)
57 content = contentreference.content
58 except ObjectDoesNotExist:
62 contentlet = page.contentlets.get(name__exact=self.name)
63 if contentlet.dynamic:
65 content = mark_safe(template.Template(contentlet.content, name=contentlet.name).render(context))
66 except template.TemplateSyntaxError, error:
68 content = ('[Error parsing contentlet \'%s\': %s]' % self.name, error)
70 content = contentlet.content
71 except ObjectDoesNotExist:
75 def do_container(parser, token):
77 {% container <name> [[references <type>] as <variable>] %}
78 {% blockcontainer <name> [[references <type>] as <variable>] %} [ {% empty %} ] {% endblockcontainer %}
80 params = token.split_contents()
83 name = params[1].strip('"')
87 remaining_tokens = params[2:]
88 while remaining_tokens:
89 option_token = remaining_tokens.pop(0)
90 if option_token == 'references':
92 app_label, model = remaining_tokens.pop(0).strip('"').split('.')
93 references = ContentType.objects.get(app_label=app_label, model=model)
95 raise template.TemplateSyntaxError('"%s" template tag option "references" requires an argument specifying a content type' % tag)
97 raise template.TemplateSyntaxError('"%s" template tag option "references" requires an argument of the form app_label.model (see django.contrib.contenttypes)' % tag)
98 except ObjectDoesNotExist:
99 raise template.TemplateSyntaxError('"%s" template tag option "references" requires an argument of the form app_label.model which refers to an installed content type (see django.contrib.contenttypes)' % tag)
100 elif option_token == 'as':
102 as_var = remaining_tokens.pop(0)
104 raise template.TemplateSyntaxError('"%s" template tag option "as" requires an argument specifying a variable name' % tag)
105 if references and not as_var:
106 raise template.TemplateSyntaxError('"%s" template tags using "references" option require additional use of the "as" option specifying a variable name' % tag)
107 if tag == 'container':
108 return ContainerNode(name, references, as_var)
110 nodelist_main = parser.parse(('empty','endblockcontainer',))
111 token = parser.next_token()
113 if token.contents == 'empty':
114 nodelist_empty = parser.parse(('endblockcontainer',))
115 parser.delete_first_token()
117 nodelist_empty = None
118 return BlockContainerNode(name, references, as_var, nodelist_main, nodelist_empty)
121 raise template.TemplateSyntaxError('"%s" template tag provided without arguments (at least one required)' % tag)
122 register.tag('container', do_container)