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lib.py

# Copyright (c) 2006-2008 Alex Holkner
# All rights reserved.
# 
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# 
#   * Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright 
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#     the documentation and/or other materials provided with the
#     distribution.
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#     contributors may be used to endorse or promote products
#     derived from this software without specific prior written
#     permission.
# 
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
# COPYRIGHT OWNER 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
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.


import os
import re
import sys

import ctypes
import ctypes.util

_debug_lib = False
_debug_trace = False

00042 class LibraryLoader(object):
00043     def load_library(self, *names, **kwargs):
        '''Find and load a library.  
        
        More than one name can be specified, they will be tried in order.
        Platform-specific library names (given as kwargs) are tried first.

        Raises ImportError if library is not found.
        '''
        if 'framework' in kwargs and self.platform == 'darwin':
            return self.load_framework(kwargs['framework'])
        
        platform_names = kwargs.get(self.platform, [])
        if type(platform_names) in (str, unicode):
            platform_names = [platform_names]
        elif type(platform_names) is tuple:
            platform_names = list(platform_names)

        if self.platform == 'linux2':
            platform_names.extend(['lib%s.so' % n for n in names])

        platform_names.extend(names)
        for name in platform_names:
            try:
                lib = ctypes.cdll.LoadLibrary(name)
                #if _debug_lib:
                print "Loaded library :", name
                #if _debug_trace:
                #    lib = _TraceLibrary(lib)
                return lib
            except OSError:
                path = self.find_library(name)
                if path:
                    try:
                        lib = ctypes.cdll.LoadLibrary(path)
                        if _debug_lib:
                            print path
                        if _debug_trace:
                            lib = _TraceLibrary(lib)
                        return lib
                    except OSError:
                        pass
        raise ImportError('Library "%s" not found.' % names[0])

    find_library = lambda self, name: ctypes.util.find_library(name)

    platform = sys.platform
    if platform == 'cygwin':
        platform = 'win32'

    def load_framework(self, path):
        raise RuntimeError("Can't load framework on this platform.")


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