Moved philo files into a philo subdirectory and added a setup.py file. Philo can...

[philo.git] / philo / templatetags / nodes.py

diff --git a/philo/templatetags/nodes.py b/philo/templatetags/nodes.py
new file mode 100644 (file)
index 0000000..5ae507d
--- /dev/null
+++ b/philo/templatetags/nodes.py
@@ -0,0 +1,114 @@
+from django import template
+from django.conf import settings
+from django.contrib.sites.models import Site
+from django.core.urlresolvers import reverse, NoReverseMatch
+from django.template.defaulttags import kwarg_re
+from django.utils.encoding import smart_str
+from philo.exceptions import ViewCanNotProvideSubpath
+
+
+register = template.Library()
+
+
+class NodeURLNode(template.Node):
+       def __init__(self, node, as_var, with_obj=None, view_name=None, args=None, kwargs=None):
+               self.as_var = as_var
+               self.view_name = view_name
+               
+               # Because the following variables have already been compiled as filters if they exist, they don't need to be re-scanned as template variables.
+               self.node = node
+               self.with_obj = with_obj
+               self.args = args
+               self.kwargs = kwargs
+       
+       def render(self, context):
+               if self.node:
+                       node = self.node.resolve(context)
+               else:
+                       node = context.get('node', None)
+               
+               if not node:
+                       return settings.TEMPLATE_STRING_IF_INVALID
+               
+               if self.with_obj is None and self.view_name is None:
+                       url = node.get_absolute_url()
+               else:
+                       if not node.view.accepts_subpath:
+                               return settings.TEMPLATE_STRING_IF_INVALID
+                       
+                       if self.with_obj is not None:
+                               try:
+                                       view_name, args, kwargs = node.view.get_reverse_params(self.with_obj.resolve(context))
+                               except ViewCanNotProvideSubpath:
+                                       return settings.TEMPLATE_STRING_IF_INVALID
+                       else: # self.view_name is not None
+                               view_name = self.view_name
+                               args = [arg.resolve(context) for arg in self.args]
+                               kwargs = dict([(smart_str(k, 'ascii'), v.resolve(context)) for k, v in self.kwargs.items()])
+                       
+                       url = ''
+                       try:
+                               subpath = reverse(view_name, urlconf=node.view, args=args, kwargs=kwargs)
+                       except NoReverseMatch:
+                               if self.as_var is None:
+                                       if settings.TEMPLATE_DEBUG:
+                                               raise
+                                       return settings.TEMPLATE_STRING_IF_INVALID
+                       else:
+                               url = node.construct_url(subpath)
+               
+               if self.as_var:
+                       context[self.as_var] = url
+                       return ''
+               else:
+                       return url
+
+
+@register.tag(name='node_url')
+def do_node_url(parser, token):
+       """
+       {% node_url [for <node>] [as <var>] %}
+       {% node_url with <obj> [for <node>] [as <var>] %}
+       {% node_url <view_name> [<arg1> [<arg2> ...] ] [for <node>] [as <var>] %}
+       {% node_url <view_name> [<key1>=<value1> [<key2>=<value2> ...] ] [for <node>] [as <var>]%}
+       """
+       params = token.split_contents()
+       tag = params[0]
+       as_var = None
+       with_obj = None
+       node = None
+       params = params[1:]
+       
+       if len(params) >= 2 and params[-2] == 'as':
+               as_var = params[-1]
+               params = params[:-2]
+       
+       if len(params) >= 2 and params[-2] == 'for':
+               node = parser.compile_filter(params[-1])
+               params = params[:-2]
+       
+       if len(params) >= 2 and params[-2] == 'with':
+               with_obj = parser.compile_filter(params[-1])
+               params = params[:-2]
+       
+       if with_obj is not None:
+               if params:
+                       raise template.TemplateSyntaxError('`%s` template tag accepts no arguments or keyword arguments if with <obj> is specified.' % tag)
+               return NodeURLNode(with_obj=with_obj, node=node, as_var=as_var)
+       
+       if params:
+               args = []
+               kwargs = {}
+               view_name = params.pop(0)
+               for param in params:
+                       match = kwarg_re.match(param)
+                       if not match:
+                               raise TemplateSyntaxError("Malformed arguments to `%s` tag" % tag)
+                       name, value = match.groups()
+                       if name:
+                               kwargs[name] = parser.compile_filter(value)
+                       else:
+                               args.append(parser.compile_filter(value))
+               return NodeURLNode(view_name=view_name, args=args, kwargs=kwargs, node=node, as_var=as_var)
+       
+       return NodeURLNode(node=node, as_var=as_var)
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