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# Copyright 2012 GRNET S.A. 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 GRNET S.A. ``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 GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

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from imp import find_module, load_module

_modules = {}

def imp_module(fullname):

    if fullname in _modules:

        return _modules[fullname]

    components = fullname.split('.')

    if not components:

        raise ValueError('invalid module name')

    module = None

    modulepath = []

    for name in components:

        if not name:

            raise ValueError("Relative paths not allowed")

        modulepath.append(name)

        modulename = '.'.join(modulepath)

        if modulename in _modules:

            module = _modules[modulename]

        elif hasattr(module, name):

            module = getattr(module, name)

        elif not hasattr(module, '__path__'):

            m = find_module(name)

            module = load_module(modulename, *m)

        else:

            try:

                m = find_module(name, module.__path__)

                module = load_module(modulename, *m)

            except ImportError:

                m = "No module '%s' in '%s'" % (name, module.__path__)

                raise ImportError(m)

        _modules[modulename] = module

    return module

def list_modules():

    return sorted(_modules.keys())