plugin.py

linux下的一款播放器

# 
# ***** BEGIN LICENSE BLOCK *****
# Source last modified: $Id: plugin.py,v 1.2 2004/07/07 22:00:04 hubbe Exp $
# 
# Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
# 
# The contents of this file, and the files included with this file,
# are subject to the current version of the RealNetworks Public
# Source License (the "RPSL") available at
# http://www.helixcommunity.org/content/rpsl unless you have licensed
# the file under the current version of the RealNetworks Community
# Source License (the "RCSL") available at
# http://www.helixcommunity.org/content/rcsl, in which case the RCSL
# will apply. You may also obtain the license terms directly from
# RealNetworks.  You may not use this file except in compliance with
# the RPSL or, if you have a valid RCSL with RealNetworks applicable
# to this file, the RCSL.  Please see the applicable RPSL or RCSL for
# the rights, obligations and limitations governing use of the
# contents of the file.
# 
# Alternatively, the contents of this file may be used under the
# terms of the GNU General Public License Version 2 or later (the
# "GPL") in which case the provisions of the GPL are applicable
# instead of those above. If you wish to allow use of your version of
# this file only under the terms of the GPL, and not to allow others
# to use your version of this file under the terms of either the RPSL
# or RCSL, indicate your decision by deleting the provisions above
# and replace them with the notice and other provisions required by
# the GPL. If you do not delete the provisions above, a recipient may
# use your version of this file under the terms of any one of the
# RPSL, the RCSL or the GPL.
# 
# This file is part of the Helix DNA Technology. RealNetworks is the
# developer of the Original Code and owns the copyrights in the
# portions it created.
# 
# This file, and the files included with this file, is distributed
# and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
# KIND, EITHER EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS
# ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET
# ENJOYMENT OR NON-INFRINGEMENT.
# 
# Technology Compatibility Kit Test Suite(s) Location:
#    http://www.helixcommunity.org/content/tck
# 
# Contributor(s):
# 
# ***** END LICENSE BLOCK *****
# 
"""Build system plugin loader."""

import os
import sys
import string
import outmsg
import err


def load_local_class():
    ## plugins 
    filename = None
    if os.path.isfile('Buildfil'): filename = 'Buildfil'
    if os.path.isfile('buildfil'): filename = 'buildfil'

    ## no local plugin found
    if not filename: return None

    ## set up the namespace to invoke the plugin with
    plugin_ns = {}

    ## give it the current 'sys' so it gets the current sys.path
    plugin_ns['sys'] = sys
    execfile(filename, plugin_ns)

    ## get the plugin class reference
    plugin_class = None
    if plugin_ns.has_key('get_collate_class'):
        func = plugin_ns['get_collate_class']
        plugin_class = func()

    return plugin_class


def load_class(module):
    ## first try to load a locally defined collation class
    plugin_class = load_local_class()
    if plugin_class:
        return plugin_class

    ## load a built-in collater
    if module.type == module.MODULE_CVS:
        import compile
        plugin_class = compile.get_collate_class()

    return plugin_class