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import os
from compressor.exceptions import FilterError
def get_class(class_string, exception=FilterError):
"""
Convert a string version of a function name to the callable object.
"""
if not hasattr(class_string, "__bases__"):
try:
class_string = str(class_string)
mod_name, class_name = get_mod_func(class_string)
if class_name:
return getattr(__import__(mod_name, {}, {}, [str("")]), class_name)
except AttributeError as e:
raise exception(
"Failed to import %s. AttributeError is: %s" % (class_string, e)
)
except ImportError as e:
raise exception(
"Failed to import %s. ImportError is: %s" % (class_string, e)
)
raise exception("Invalid class path '%s'" % class_string)
def get_mod_func(callback):
"""
Converts 'django.views.news.stories.story_detail' to
('django.views.news.stories', 'story_detail')
"""
try:
dot = callback.rindex(".")
except ValueError:
return callback, ""
return callback[:dot], callback[dot + 1 :]
def get_pathext(default_pathext=None):
"""
Returns the path extensions from environment or a default
"""
if default_pathext is None:
default_pathext = os.pathsep.join([".COM", ".EXE", ".BAT", ".CMD"])
return os.environ.get("PATHEXT", default_pathext)
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