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 ?÷     """Find modules used by a script, using introspection."""
# This module should be kept compatible with Python 2.2, see PEP 291.

from __future__ import generators
import dis
import imp
import marshal
import os
import sys
import types
import struct

if hasattr(sys.__stdout__, "newlines"):
    READ_MODE = "U"  # universal line endings
else:
    # remain compatible with Python  < 2.3
    READ_MODE = "r"

LOAD_CONST = chr(dis.opname.index('LOAD_CONST'))
IMPORT_NAME = chr(dis.opname.index('IMPORT_NAME'))
STORE_NAME = chr(dis.opname.index('STORE_NAME'))
STORE_GLOBAL = chr(dis.opname.index('STORE_GLOBAL'))
STORE_OPS = [STORE_NAME, STORE_GLOBAL]
HAVE_ARGUMENT = chr(dis.HAVE_ARGUMENT)

# Modulefinder does a good job at simulating Python's, but it can not
# handle __path__ modifications packages make at runtime.  Therefore there
# is a mechanism whereby you can register extra paths in this map for a
# package, and it will be honored.

# Note this is a mapping is lists of paths.
packagePathMap = {}

# A Public interface
def AddPackagePath(packagename, path):
    paths = packagePathMap.get(packagename, [])
    paths.append(path)
    packagePathMap[packagename] = paths

replacePackageMap = {}

# This ReplacePackage mechanism allows modulefinder to work around the
# way the _xmlplus package injects itself under the name "xml" into
# sys.modules at runtime by calling ReplacePackage("_xmlplus", "xml")
# before running ModuleFinder.

def ReplacePackage(oldname, newname):
    replacePackageMap[oldname] = newname


class Module:

    def __init__(self, name, file=None, path=None):
        self.__name__ = name
        self.__file__ = file
        self.__path__ = path
        self.__code__ = None
        # The set of global names that are assigned to in the module.
        # This includes those names imported through starimports of
        # Python modules.
        self.globalnames = {}
        # The set of starimports this module did that could not be
        # resolved, ie. a starimport from a non-Python module.
        self.starimports = {}

    def __repr__(self):
        s = "Module(%r" % (self.__name__,)
        if self.__file__ is not None:
            s = s + ", %r" % (self.__file__,)
        if self.__path__ is not None:
            s = s + ", %r" % (self.__path__,)
        s = s + ")"
        return s

class ModuleFinder:

    def __init__(self, path=None, debug=0, excludes=[], replace_paths=[]):
        if path is None:
            path = sys.path
        self.path = path
        self.modules = {}
        self.badmodules = {}
        self.debug = debug
        self.indent = 0
        self.excludes = excludes
        self.replace_paths = replace_paths
        self.processed_paths = []   # Used in debugging only

    def msg(self, level, str, *args):
        if level <= self.debug:
            for i in range(self.indent):
                print "   ",
            print str,
            for arg in args:
                print repr(arg),
            print

    def msgin(self, *args):
        level = args[0]
        if level <= self.debug:
            self.indent = self.indent + 1
            self.msg(*args)

    def msgout(self, *args):
        level = args[0]
        if level <= self.debug:
            self.indent = self.indent - 1
            self.msg(*args)

    def run_script(self, pathname):
        self.msg(2, "run_script", pathname)
        fp = open(pathname, READ_MODE)
        stuff = ("", "r", imp.PY_SOURCE)
        self.load_module('__main__', fp, pathname, stuff)

    def load_file(self, pathname):
        dir, name = os.path.split(pathname)
        name, ext = os.path.splitext(name)
        fp = open(pathname, READ_MODE)
        stuff = (ext, "r", imp.PY_SOURCE)
        self.load_module(name, fp, pathname, stuff)

    def import_hook(self, name, caller=None, fromlist=None, level=-1):
        self.msg(3, "import_hook", name, caller, fromlist, level)
        parent = self.determine_parent(caller, level=level)
        q, tail = self.find_head_package(parent, name)
        m = self.load_tail(q, tail)
        if not f