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)
34 if not self.nodelist_main:
36 context[self.as_var] = container_content
39 if not container_content:
42 return container_content
45 if self.as_var is None:
46 self.as_var = self.name
50 context[self.as_var] = container_content
51 nodelist = template.NodeList()
52 for node in self.nodelist_main:
53 nodelist.append(node.render(context))
55 return nodelist.render(context)
57 if self.nodelist_empty is not None:
58 return self.nodelist_empty.render(context)
62 def get_container_content(self, context):
63 page = context['page']
66 contentreference = page.contentreferences.get(name__exact=self.name, content_type=self.references)
67 content = contentreference.content
68 except ObjectDoesNotExist:
72 contentlet = page.contentlets.get(name__exact=self.name)
73 if contentlet.dynamic:
75 content = mark_safe(template.Template(contentlet.content, name=contentlet.name).render(context))
76 except template.TemplateSyntaxError, error:
78 content = ('[Error parsing contentlet \'%s\': %s]' % (self.name, error))
80 content = contentlet.content
81 except ObjectDoesNotExist:
86 def do_container(parser, token):
88 {% container <name> [[references <type>] as <variable>] %}
89 {% blockcontainer <name> [[references <type>] as <variable>] %} [ {% empty %} ] {% endblockcontainer %}
91 params = token.split_contents()
94 name = params[1].strip('"')
98 remaining_tokens = params[2:]
99 while remaining_tokens:
100 option_token = remaining_tokens.pop(0)
101 if option_token == 'references':
103 app_label, model = remaining_tokens.pop(0).strip('"').split('.')
104 references = ContentType.objects.get(app_label=app_label, model=model)
106 raise template.TemplateSyntaxError('"%s" template tag option "references" requires an argument specifying a content type' % tag)
108 raise template.TemplateSyntaxError('"%s" template tag option "references" requires an argument of the form app_label.model (see django.contrib.contenttypes)' % tag)
109 except ObjectDoesNotExist:
110 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)
111 elif option_token == 'as':
113 as_var = remaining_tokens.pop(0)
115 raise template.TemplateSyntaxError('"%s" template tag option "as" requires an argument specifying a variable name' % tag)
116 if references and not as_var:
117 raise template.TemplateSyntaxError('"%s" template tags using "references" option require additional use of the "as" option specifying a variable name' % tag)
118 if tag == 'container':
119 return ContainerNode(name, references, as_var)
121 nodelist_main = parser.parse(('empty','endblockcontainer',))
122 token = parser.next_token()
124 if token.contents == 'empty':
125 nodelist_empty = parser.parse(('endblockcontainer',))
126 parser.delete_first_token()
128 nodelist_empty = None
129 return ContainerNode(name, references, as_var, nodelist_main, nodelist_empty)
132 raise template.TemplateSyntaxError('"%s" template tag provided without arguments (at least one required)' % tag)
135 register.tag('container', do_container)
136 register.tag('blockcontainer', do_container)