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# Copyright (c) 2002, 2005 Allan Saddi <allan@saddi.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id$
__author__ = 'Allan Saddi <allan@saddi.com>'
__version__ = '$Revision$'
import sys
import os
import imp
from resolver import *
__all__ = ['ImportingModuleResolver']
class NoDefault(object):
pass
class ImportingModuleResolver(Resolver):
"""
Constructor takes a directory name or a list of directories. Interprets
the first two components of PATH_INFO as 'module/function'. Modules
are imported as needed and must reside in the directories specified.
Module and function names beginning with underscore are ignored.
If the 'module' part of PATH_INFO is missing, it is assumed to be
self.default_module.
If the 'function' part of PATH_INFO is missing, it is assumed to be
self.index_page.
Upon successful resolution, appends the module and function names to
SCRIPT_NAME and updates PATH_INFO as the remaining components of the path.
NB: I would recommend explicitly setting all modules' __all__ list.
Otherwise, be sure all the names of module-level callables that you
don't want exported begin with underscore.
"""
# No default module by default.
default_module = None
index_page = 'index'
def __init__(self, path, defaultModule=NoDefault, index=NoDefault):
self.path = path
if defaultModule is not NoDefault:
self.default_module = defaultModule
if index is not NoDefault:
self.index_page = index
def resolve(self, request, redirect=False):
path_info = request.pathInfo.split(';')[0]
path_info = path_info.split('/')
assert len(path_info) > 0
assert not path_info[0]
while len(path_info) < 3:
path_info.append('')
module_name, func_name = path_info[1:3]
if not module_name:
module_name = self.default_module
if not func_name:
func_name = self.index_page
module = None
if module_name and (module_name[0] != '_' or redirect) and \
not module_name.count('.'):
module = _import_module(module_name, path=self.path)
if module is not None:
if func_name and (func_name[0] != '_' or redirect):
module_all = getattr(module, '__all__', None)
if module_all is None or func_name in module_all or redirect:
func = getattr(module, func_name, None)
if callable(func):
self._updatePath(request, 2)
return func
return None
def _import_module(name, path=None):
"""
Imports a module. If path is None, module will be searched for in
sys.path. If path is given (which may be a single string or a list),
the module will only be searched for in those directories.
"""
if path is not None and type(path) is not list:
path = [path]
module = sys.modules.get(name)
if module is not None:
module_file = getattr(module, '__file__')
if module_file is None or \
(path is not None and os.path.dirname(module_file) not in path):
return None
return module
fp, pathname, description = imp.find_module(name, path)
try:
return imp.load_module(name, fp, pathname, description)
finally:
if fp:
fp.close()
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