"""Find modules used by a script, using introspection."""
import dis
import imp
import marshal
import os
import re
import string
import sys
if sys.platform=="win32":
# On Windows, we can locate modules in the registry with
# the help of the win32api package.
try:
import win32api
except ImportError:
print "The win32api module is not available - modules listed"
print "in the registry will not be found."
win32api = None
IMPORT_NAME = dis.opname.index('IMPORT_NAME')
IMPORT_FROM = dis.opname.index('IMPORT_FROM')
# 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 honoured.
# 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
class Module:
def __init__(self, name, file=None, path=None):
self.__name__ = name
self.__file__ = file
self.__path__ = path
self.__code__ = None
def __repr__(self):
s = "Module(%s" % `self.__name__`
if self.__file__ is not None:
s = s + ", %s" % `self.__file__`
if self.__path__ is not None:
s = s + ", %s" % `self.__path__`
s = s + ")"
return s
class ModuleFinder:
def __init__(self, path=None, debug=0, excludes = []):
if path is None:
path = sys.path
self.path = path
self.modules = {}
self.badmodules = {}
self.debug = debug
self.indent = 0
self.excludes = excludes
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
apply(self.msg, args)
def msgout(self, *args):
level = args[0]
if level <= self.debug:
self.indent = self.indent - 1
apply(self.msg, args)
def run_script(self, pathname):
self.msg(2, "run_script", pathname)
fp = open(pathname)
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)
stuff = (ext, "r", imp.PY_SOURCE)
self.load_module(name, fp, pathname, stuff)
def import_hook(self, name, caller=None, fromlist=None):
self.msg(3, "import_hook", name, caller, fromlist)
parent = self.determine_parent(caller)
q, tail = self.find_head_package(parent, name)
m = self.load_tail(q, tail)
if not fromlist:
return q
if m.__path__:
self.ensure_fromlist(m, fromlist)
def determine_parent(self, caller):
self.msgin(4, "determine_parent", caller)
if not caller:
self.msgout(4, "determine_parent -> None")
return None
pname = caller.__name__
if caller.__path__:
parent = self.modules[pname]
assert caller is parent
self.msgout(4, "determine_parent ->", parent)
return parent
if '.' in pname:
i = string.rfind(pname, '.')
pname = pname[:i]
parent = self.modules[pname]
assert parent.__name__ == pname
self.msgout(4, "determine_parent ->", parent)
return parent
self.msgout(4, "determine_parent -> None")
return None
def find_head_package(self, parent, name):
self.msgin(4, "find_head_package", parent, name)
if '.' in name:
i = string.find(name, '.')
head = name[:i]
tail = name[i+1:]
else:
head = name
tail = ""
if parent:
qname = "%s.%s" % (parent.__name__, head)
else:
qname = head
q = self.import_module(head, qname, parent)
if q:
self.msgout(4, "find_head_package ->", (q, tail))
return q, tail
if parent:
qname = head
parent = None
q = self.import_module(head, qname, parent)
if q:
self.msgout(4, "find_head_package ->", (q, tail))
return q, tail
self.msgout(4, "raise ImportError: No module named", qname)
raise ImportError, "No module named " + qname
def load_tail(self, q, tail):
self.msgin(4, "load_tail", q, tail)
m = q
while tail:
i = string.find(tail, '.')
if i < 0: i = len(tail)
head, tail = tail[:i], tail[i+1:]
mname = "%s.%s" % (m.__name__, head)
m = self.import_module(head, mname, m)
if not m:
self.msgout(4, "raise ImportError: No module named", mname)
raise ImportError, "No module named " + mname
self.msgout(4, "load_tail ->", m)
return m
def ensure_fromlist(self, m, fromlist, recursive=0):
self.msg(4, "ensure_fromlist", m, fromlist, recursive)
for sub in fromlist:
if sub == "*":
if not recursive:
all = self.find_all_submodules(m)
if all:
self.ensure_fromlist(m, all, 1)
elif not hasattr(m, sub):
subname = "%s.%s" % (m.__name__, sub)
submod = self.import_module(sub, subname, m)
if not submod:
raise ImportError, "No module named " + subname
def find_all_submodules(self, m):
if not m.__path__:
return
modules = {}
suffixes = [".py", ".pyc", ".pyo"]
for dir in m.__path__:
try:
names = os.listdir(dir)
except os.error:
self.msg(2, "can't list directory", dir)
continue
for name in names:
mod = None
for suff in suffixes:
n = len(suff)
if name[-n:] == suff:
mod = name[:-n]
break
if mod and mod != "__init__":
modules[mod] = mod
return modules.keys()
def import_module(self, partname, fqname, parent):
self.msgin(3, "import_module", partname, fqname, parent)
try:
m = self.modules[fqname]
except KeyError:
pass
else:
self.msgout(3, "import_module ->", m)
return m
if self.badmodules.has_key(fqname):
self.msgout(3, "import_module -> None")
if parent:
self.badmodules[fqname][parent.__name__] = None
return None
try:
fp, pathname, stuff = self.find_module(partname,
parent and parent.__path__)
except ImportError:
self.msgout(3, "import_module ->", None)
return None
try:
m = self.load_module(fqname, fp, pathname, stuff)
finally:
if fp: fp.close()
if parent:
setattr(parent, partname, m)
self.msgout(3, "import_module ->", m)
return m
def load_module(self, fqname, fp, pathname, (suffix, mode, type)):
self.msgin(2, "load_module", fqname, fp and "fp", pathname)
if type == imp.PKG_DIRECTORY:
m = self.load_package(fqname, pathname)
self.msgout(2, "load_module ->", m)
return m
if type == imp.PY_SOURCE:
co = compile(fp.read()+'\n', pathname, 'exec')
elif type == imp.PY_COMPILED:
if fp.read(4) != imp.get_magic():
self.msgout(2, "raise ImportError: Bad magic number", pathname)
raise ImportError, "Bad magic number in %s", pathname
fp.read(4)
co = marshal.load(fp)
else:
co = None
m = self.add_module(fqname)
m.__file__ = pathname
if co:
m.__code__ = co
self.scan_code(co, m)
self.msgout(2, "load_module ->", m)
return m
def scan_code(self, co, m):
code = co.co_code
n = len(code)
i = 0
lastname = None
while i < n:
c = code[i]
i = i+1
op = ord(c)
if op >= dis.HAVE_ARGUMENT:
oparg = ord(code[i]) + ord(code[i+1])*256
i = i+2
if op == IMPORT_NAME:
name = lastname = co.co_names[oparg]
if not self.badmodules.has_key(lastname):
try:
self.import_hook(name, m)
except ImportError, msg:
self.msg(2, "ImportError:", str(msg))
if not self.badmodules.has_key(name):
self.badmodules[name] = {}
self.badmodules[name][m.__name__] = None
elif op == IMPORT_FROM:
name = co.co_names[oparg]
assert lastname is not None
if not self.badmodules.has_key(lastname):
try:
self.import_hook(lastname, m, [name])
except ImportError, msg:
self.msg(2, "ImportError:", str(msg))
fullname = lastname + "." + name
if not self.badmodules.has_key(fullname):
self.badmodules[fullname] = {}
self.badmodules[fullname][m.__name__] = None
else:
lastname = None
for c in co.co_consts:
if isinstance(c, type(co)):
self.scan_code(c, m)
def load_package(self, fqname, pathname):
self.msgin(2, "load_package", fqname, pathname)
m = self.add_module(fqname)
m.__file__ = pathname
m.__path__ = [pathname]
# As per comment at top of file, simulate runtime __path__ additions.
m.__path__ = m.__path__ + packagePathMap.get(fqname, [])
fp, buf, stuff = self.find_module("__init__", m.__path__)
self.load_module(fqname, fp, buf, stuff)
self.msgout(2, "load_package ->", m)
return m
def add_module(self, fqname):
if self.modules.has_key(fqname):
return self.modules[fqname]
self.modules[fqname] = m = Module(fqname)
return m
def find_module(self, name, path):
if name in self.excludes:
self.msgout(3, "find_module -> Excluded")
raise ImportError, name
if path is None:
if name in sys.builtin_module_names:
return (None, None, ("", "", imp.C_BUILTIN))
# Emulate the Registered Module support on Windows.
if sys.platform=="win32" and win32api is not None:
HKEY_LOCAL_MACHINE = 0x80000002
try:
pathname = win32api.RegQueryValue(HKEY_LOCAL_MACHINE, "Software\\Python\\PythonCore\\%s\\Modules\\%s" % (sys.winver, name))
fp = open(pathname, "rb")
# XXX - To do - remove the hard code of C_EXTENSION.
stuff = "", "rb", imp.C_EXTENSION
return fp, pathname, stuff
except win32api.error:
pass
path = self.path
return imp.find_module(name, path)
def report(self):
print
print " %-25s %s" % ("Name", "File")
print " %-25s %s" % ("----", "----")
# Print modules found
keys = self.modules.keys()
keys.sort()
for key in keys:
m = self.modules[key]
if m.__path__:
print "P",
else:
print "m",
print "%-25s" % key, m.__file__ or ""
# Print missing modules
keys = self.badmodules.keys()
keys.sort()
for key in keys:
# ... but not if they were explicitely excluded.
if key not in self.excludes:
mods = self.badmodules[key].keys()
mods.sort()
print "?", key, "from", string.join(mods, ', ')
def test():
# Parse command line
import getopt
try:
opts, args = getopt.getopt(sys.argv[1:], "dmp:qx:")
except getopt.error, msg:
print msg
return
# Process options
debug = 1
domods = 0
addpath = []
exclude = []
for o, a in opts:
if o == '-d':
debug = debug + 1
if o == '-m':
domods = 1
if o == '-p':
addpath = addpath + string.split(a, os.pathsep)
if o == '-q':
debug = 0
if o == '-x':
exclude.append(a)
# Provide default arguments
if not args:
script = "hello.py"
else:
script = args[0]
# Set the path based on sys.path and the script directory
path = sys.path[:]
path[0] = os.path.dirname(script)
path = addpath + path
if debug > 1:
print "path:"
for item in path:
print " ", `item`
# Create the module finder and turn its crank
mf = ModuleFinder(path, debug, exclude)
for arg in args[1:]:
if arg == '-m':
domods = 1
continue
if domods:
if arg[-2:] == '.*':
mf.import_hook(arg[:-2], None, ["*"])
else:
mf.import_hook(arg)
else:
mf.load_file(arg)
mf.run_script(script)
mf.report()
if __name__ == '__main__':
try:
test()
except KeyboardInterrupt:
print "\n[interrupt]"
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