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Current File : //compat/linux/proc/self/root/usr/local/share/examples/python2.5/imputil/knee.py |
"""An Python re-implementation of hierarchical module import. This code is intended to be read, not executed. However, it does work -- all you need to do to enable it is "import knee". (The name is a pun on the klunkier predecessor of this module, "ni".) """ import sys, imp, __builtin__ # Replacement for __import__() def import_hook(name, globals=None, locals=None, fromlist=None): parent = determine_parent(globals) q, tail = find_head_package(parent, name) m = load_tail(q, tail) if not fromlist: return q if hasattr(m, "__path__"): ensure_fromlist(m, fromlist) return m def determine_parent(globals): if not globals or not globals.has_key("__name__"): return None pname = globals['__name__'] if globals.has_key("__path__"): parent = sys.modules[pname] assert globals is parent.__dict__ return parent if '.' in pname: i = pname.rfind('.') pname = pname[:i] parent = sys.modules[pname] assert parent.__name__ == pname return parent return None def find_head_package(parent, name): if '.' in name: i = name.find('.') head = name[:i] tail = name[i+1:] else: head = name tail = "" if parent: qname = "%s.%s" % (parent.__name__, head) else: qname = head q = import_module(head, qname, parent) if q: return q, tail if parent: qname = head parent = None q = import_module(head, qname, parent) if q: return q, tail raise ImportError, "No module named " + qname def load_tail(q, tail): m = q while tail: i = tail.find('.') if i < 0: i = len(tail) head, tail = tail[:i], tail[i+1:] mname = "%s.%s" % (m.__name__, head) m = import_module(head, mname, m) if not m: raise ImportError, "No module named " + mname return m def ensure_fromlist(m, fromlist, recursive=0): for sub in fromlist: if sub == "*": if not recursive: try: all = m.__all__ except AttributeError: pass else: ensure_fromlist(m, all, 1) continue if sub != "*" and not hasattr(m, sub): subname = "%s.%s" % (m.__name__, sub) submod = import_module(sub, subname, m) if not submod: raise ImportError, "No module named " + subname def import_module(partname, fqname, parent): try: return sys.modules[fqname] except KeyError: pass try: fp, pathname, stuff = imp.find_module(partname, parent and parent.__path__) except ImportError: return None try: m = imp.load_module(fqname, fp, pathname, stuff) finally: if fp: fp.close() if parent: setattr(parent, partname, m) return m # Replacement for reload() def reload_hook(module): name = module.__name__ if '.' not in name: return import_module(name, name, None) i = name.rfind('.') pname = name[:i] parent = sys.modules[pname] return import_module(name[i+1:], name, parent) # Save the original hooks original_import = __builtin__.__import__ original_reload = __builtin__.reload # Now install our hooks __builtin__.__import__ = import_hook __builtin__.reload = reload_hook