Introduce dynamic scope_path regexps
Instead of relying on scope_path's being "one slash deep", we should
instead allow for either:
1. scope_paths that have a pre-defined depth
2. scope_paths that can be arbitrarily deep
We achieve 1 by setting an entities scope_logic to another logic
module. We then recursively call getScopeDepth until we get to the
topmost entity (that is, an unscoped entity).
A little different is the solution to 2, since some entities can have
an arbitrarily deep scope (such as Documents), we need to have some
way of signaling this to getScopePattern. A clean solution is to
return None, rather than a number. If None is returned, the
SCOPE_PATH_ARG_PATTERN is returned as regexp instead, which will
match an arbitrarily deeply nested scope.
The solution for 2 requires that we return None somewhere in the
scope_logic chain, the most straight forward method to do so is to
override getScopeDepth anywhere such a scope is needed and make it
return None. A more elegant solution however, is to set the
scope_logic to that module in all entities that require it.
Patch by: Sverre Rabbelier
"""
Wrapper for loading templates from the filesystem.
"""
from django.conf import settings
from django.template import TemplateDoesNotExist
from django.utils._os import safe_join
def get_template_sources(template_name, template_dirs=None):
"""
Returns the absolute paths to "template_name", when appended to each
directory in "template_dirs". Any paths that don't lie inside one of the
template dirs are excluded from the result set, for security reasons.
"""
if not template_dirs:
template_dirs = settings.TEMPLATE_DIRS
for template_dir in template_dirs:
try:
yield safe_join(template_dir, template_name)
except UnicodeDecodeError:
# The template dir name was a bytestring that wasn't valid UTF-8.
raise
except ValueError:
# The joined path was located outside of this particular
# template_dir (it might be inside another one, so this isn't
# fatal).
pass
def load_template_source(template_name, template_dirs=None):
tried = []
for filepath in get_template_sources(template_name, template_dirs):
try:
return (open(filepath).read().decode(settings.FILE_CHARSET), filepath)
except IOError:
tried.append(filepath)
if tried:
error_msg = "Tried %s" % tried
else:
error_msg = "Your TEMPLATE_DIRS setting is empty. Change it to point to at least one template directory."
raise TemplateDoesNotExist, error_msg
load_template_source.is_usable = True