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aˆÑÙ „n¸×¿× ?÷ a""" Import utilities Exported classes: ImportManager Manage the import process Importer Base class for replacing standard import functions BuiltinImporter Emulate the import mechanism for builtin and frozen modules DynLoadSuffixImporter """ from warnings import warnpy3k warnpy3k("the imputil module has been removed in Python 3.0", stacklevel=2) del warnpy3k # note: avoid importing non-builtin modules import imp ### not available in Jython? import sys import __builtin__ # for the DirectoryImporter import struct import marshal __all__ = ["ImportManager","Importer","BuiltinImporter"] _StringType = type('') _ModuleType = type(sys) ### doesn't work in Jython... class ImportManager: "Manage the import process." def install(self, namespace=vars(__builtin__)): "Install this ImportManager into the specified namespace." if isinstance(namespace, _ModuleType): namespace = vars(namespace) # Note: we have no notion of "chaining" # Record the previous import hook, then install our own. self.previous_importer = namespace['__import__'] self.namespace = namespace namespace['__import__'] = self._import_hook ### fix this #namespace['reload'] = self._reload_hook def uninstall(self): "Restore the previous import mechanism." self.namespace['__import__'] = self.previous_importer def add_suffix(self, suffix, importFunc): assert hasattr(importFunc, '__call__') self.fs_imp.add_suffix(suffix, importFunc) ###################################################################### # # PRIVATE METHODS # clsFilesystemImporter = None def __init__(self, fs_imp=None): # we're definitely going to be importing something in the future, # so let's just load the OS-related facilities. if not _os_stat: _os_bootstrap() # This is the Importer that we use for grabbing stuff from the # filesystem. It defines one more method (import_from_dir) for our use. if fs_imp is None: cls = self.clsFilesystemImporter or _FilesystemImporter fs_imp = cls() self.fs_imp = fs_imp # Initialize the set of suffixes that we recognize and import. # The default will import dynamic-load modules first, followed by # .py files (or a .py file's cached bytecode) for desc in imp.get_suffixes(): if desc[2] == imp.C_EXTENSION: self.add_suffix(desc[0], DynLoadSuffixImporter(desc).import_file) self.add_suffix('.py', py_suffix_importer) def _import_hook(self, fqname, globals=None, locals=None, fromlist=None): """Python calls this hook to locate and import a module.""" parts = fqname.split('.') # determine the context of this import parent = self._determine_import_context(globals) # if there is a parent, then its importer should manage this import if parent: module = parent.__importer__._do_import(parent, parts, fromlist) if module: return module # has the top module already been imported? try: top_module = sys.modules[parts[0]] except KeyError: # look for the topmost module top_module = self._import_top_module(parts[0]) if not top_module: # the topmost module wasn't found at all. raise ImportError, 'No module named ' + fqname # fast-path simple imports if len(parts) == 1: if