text: """Parse a Python module and describe its classes and methods.
  
  Parse enough of a Python file to recognize imports and class and
  method definitions, and to find out the superclasses of a class.
  
  The interface consists of a single function:
          readmodule_ex(module [, path])
  where module is the name of a Python module, and path is an optional
  list of directories where the module is to be searched.  If present,
  path is prepended to the system search path sys.path.  The return
  value is a dictionary.  The keys of the dictionary are the names of
  the classes defined in the module (including classes that are defined
  via the from XXX import YYY construct).  The values are class
  instances of the class Class defined here.  One special key/value pair
  is present for packages: the key '__path__' has a list as its value
  which contains the package search path.
  
  A class is described by the class Class in this module.  Instances
  of this class have the following instance variables:
          module -- the module name
          name -- the name of the class
          super -- a list of super classes (Class instances)
          methods -- a dictionary of methods
          file -- the file in which the class was defined
          lineno -- the line in the file on which the class statement occurred
  The dictionary of methods uses the method names as keys and the line
  numbers on which the method was defined as values.
  If the name of a super class is not recognized, the corresponding
  entry in the list of super classes is not a class instance but a
  string giving the name of the super class.  Since import statements
  are recognized and imported modules are scanned as well, this
  shouldn't happen often.
  
  A function is described by the class Function in this module.
  Instances of this class have the following instance variables:
          module -- the module name
          name -- the name of the class
          file -- the file in which the class was defined
          lineno -- the line in the file on which the class statement occurred
  """
  
  import sys
  import imp
  import tokenize
  from token import NAME, DEDENT, OP
  from operator import itemgetter
  
  __all__ = ["readmodule", "readmodule_ex", "Class", "Function"]
  
  _modules = {}                           # cache of modules we've seen
  
  # each Python class is represented by an instance of this class
  class Class:
      '''Class to represent a Python class.'''
      def __init__(self, module, name, super, file, lineno):
          self.module = module
          self.name = name
          if super is None:
              super = []
          self.super = super
          self.methods = {}
          self.file = file
          self.lineno = lineno
  
      def _addmethod(self, name, lineno):
          self.methods[name] = lineno
  
  class Function:
      '''Class to represent a top-level Python function'''
      def __init__(self, module, name, file, lineno):
          self.module = module
          self.name = name
          self.file = file
          self.lineno = lineno
  
  def readmodule(module, path=None):
      '''Backwards compatible interface.
  
      Call readmodule_ex() and then only keep Class objects from the
      resulting dictionary.'''
  
      res = {}
      for key, value in _readmodule(module, path or []).items():
          if isinstance(value, Class):
              res[key] = value
      return res
  
  def readmodule_ex(module, path=None):
      '''Read a module file and return a dictionary of classes.
  
      Search for MODULE in PATH and sys.path, read and parse the
      module and return a dictionary with one entry for each class
      found in the module.
      '''
      return _readmodule(module, path or [])
  
  def _readmodule(module, path, inpackage=None):
      '''Do the hard work for readmodule[_ex].
  
      If INPACKAGE is given, it must be the dotted name of the package in
      which we are searching for a submodule, and then PATH must be the
      package search path; otherwise, we are searching for a top-level
      module, and PATH is combined with sys.path.
      '''
      # Compute the full module name (prepending inpackage if set)
      if inpackage is not None:
          fullmodule = "%s.%s" % (inpackage, module)
      else:
          fullmodule = module
  
      # Check in the cache
      if fullmodule in _modules:
          return _modules[fullmodule]
  
      # Initialize the dict for this module's contents
      dict = {}
  
      # Check if it is a built-in module; we don't do much for these
      if module in sys.builtin_module_names and inpackage is None:
          _modules[module] = dict
          return dict
  
      # Check for a dotted module name
      i = module.rfind('.')
      if i >= 0:
          package = module[:i]
          submodule = module[i+1:]
          parent = _readmodule(package, path, inpackage)
          if inpackage is not None:
              package = "%s.%s" % (inpackage, package)
          if not '__path__' in parent:
              raise ImportError('No package named {}'.format(package))
          return _readmodule(submodule, parent['__path__'], package)
  
      # Search the path for the module
      f = None
      if inpackage is not None:
          f, fname, (_s, _m, ty) = imp.find_module(module, path)
      else:
          f, fname, (_s, _m, ty) = imp.find_module(module, path + sys.path)
      if ty == imp.PKG_DIRECTORY:
          dict['__path__'] = [fname]
          path = [fname] + path
          f, fname, (_s, _m, ty) = imp.find_module('__init__', [fname])
      _modules[fullmodule] = dict
      if ty != imp.PY_SOURCE:
          # not Python source, can't do anything with this module
          f.close()
          return dict
  
      stack = [] # stack of (class, indent) pairs
  
      g = tokenize.generate_tokens(f.readline)
      try:
          for tokentype, token, start, _end, _line in g:
              if tokentype == DEDENT:
                  lineno, thisindent = start
                  # close nested classes and defs
                  while stack and stack[-1][1] >= thisindent:
                      del stack[-1]
              elif token == 'def':
                  lineno, thisindent = start
                  # close previous nested classes and defs
                  while stack and stack[-1][1] >= thisindent:
                      del stack[-1]
                  tokentype, meth_name, start = g.next()[0:3]
                  if tokentype != NAME:
                      continue # Syntax error
                  if stack:
                      cur_class = stack[-1][0]
                      if isinstance(cur_class, Class):
                          # it's a method
                          cur_class._addmethod(meth_name, lineno)
                      # else it's a nested def
                  else:
                      # it's a function
                      dict[meth_name] = Function(fullmodule, meth_name,
                                                 fname, lineno)
                  stack.append((None, thisindent)) # Marker for nested fns
              elif token == 'class':
                  lineno, thisindent = start
                  # close previous nested classes and defs
                  while stack and stack[-1][1] >= thisindent:
                      del stack[-1]
                  tokentype, class_name, start = g.next()[0:3]
                  if tokentype != NAME:
                      continue # Syntax error
                  # parse what follows the class name
                  tokentype, token, start = g.next()[0:3]
                  inherit = None
                  if token == '(':
                      names = [] # List of superclasses
                      # there's a list of superclasses
                      level = 1
                      super = [] # Tokens making up current superclass
                      while True:
                          tokentype, token, start = g.next()[0:3]
                          if token in (')', ',') and level == 1:
                              n = "".join(super)
                              if n in dict:
                                  # we know this super class
                                  n = dict[n]
                              else:
                                  c = n.split('.')
                                  if len(c) > 1:
                                      # super class is of the form
                                      # module.class: look in module for
                                      # class
                                      m = c[-2]
                                      c = c[-1]
                                      if m in _modules:
                                          d = _modules[m]
                                          if c in d:
                                              n = d[c]
                              names.append(n)
                              super = []
                          if token == '(':
                              level += 1
                          elif token == ')':
                              level -= 1
                              if level == 0:
                                  break
                          elif token == ',' and level == 1:
                              pass
                          # only use NAME and OP (== dot) tokens for type name
                          elif tokentype in (NAME, OP) and level == 1:
                              super.append(token)
                          # expressions in the base list are not supported
                      inherit = names
                  cur_class = Class(fullmodule, class_name, inherit,
                                    fname, lineno)
                  if not stack:
                      dict[class_name] = cur_class
                  stack.append((cur_class, thisindent))
              elif token == 'import' and start[1] == 0:
                  modules = _getnamelist(g)
                  for mod, _mod2 in modules:
                      try:
                          # Recursively read the imported module
                          if inpackage is None:
                              _readmodule(mod, path)
                          else:
                              try:
                                  _readmodule(mod, path, inpackage)
                              except ImportError:
                                  _readmodule(mod, [])
                      except:
                          # If we can't find or parse the imported module,
                          # too bad -- don't die here.
                          pass
              elif token == 'from' and start[1] == 0:
                  mod, token = _getname(g)
                  if not mod or token != "import":
                      continue
                  names = _getnamelist(g)
                  try:
                      # Recursively read the imported module
                      d = _readmodule(mod, path, inpackage)
                  except:
                      # If we can't find or parse the imported module,
                      # too bad -- don't die here.
                      continue
                  # add any classes that were defined in the imported module
                  # to our name space if they were mentioned in the list
                  for n, n2 in names:
                      if n in d:
                          dict[n2 or n] = d[n]
                      elif n == '*':
                          # don't add names that start with _
                          for n in d:
                              if n[0] != '_':
                                  dict[n] = d[n]
      except StopIteration:
          pass
  
      f.close()
      return dict
  
  def _getnamelist(g):
      # Helper to get a comma-separated list of dotted names plus 'as'
      # clauses.  Return a list of pairs (name, name2) where name2 is
      # the 'as' name, or None if there is no 'as' clause.
      names = []
      while True:
          name, token = _getname(g)
          if not name:
              break
          if token == 'as':
              name2, token = _getname(g)
          else:
              name2 = None
          names.append((name, name2))
          while token != "," and "\n" not in token:
              token = g.next()[1]
          if token != ",":
              break
      return names
  
  def _getname(g):
      # Helper to get a dotted name, return a pair (name, token) where
      # name is the dotted name, or None if there was no dotted name,
      # and token is the next input token.
      parts = []
      tokentype, token = g.next()[0:2]
      if tokentype != NAME and token != '*':
          return (None, token)
      parts.append(token)
      while True:
          tokentype, token = g.next()[0:2]
          if token != '.':
              break
          tokentype, token = g.next()[0:2]
          if tokentype != NAME:
              break
          parts.append(token)
      return (".".join(parts), token)
  
  def _main():
      # Main program for testing.
      import os
      mod = sys.argv[1]
      if os.path.exists(mod):
          path = [os.path.dirname(mod)]
          mod = os.path.basename(mod)
          if mod.lower().endswith(".py"):
              mod = mod[:-3]
      else:
          path = []
      dict = readmodule_ex(mod, path)
      objs = dict.values()
      objs.sort(lambda a, b: cmp(getattr(a, 'lineno', 0),
                                 getattr(b, 'lineno', 0)))
      for obj in objs:
          if isinstance(obj, Class):
              print "class", obj.name, obj.super, obj.lineno
              methods = sorted(obj.methods.iteritems(), key=itemgetter(1))
              for name, lineno in methods:
                  if name != "__path__":
                      print "  def", name, lineno
          elif isinstance(obj, Function):
              print "def", obj.name, obj.lineno
  
  if __name__ == "__main__":
      _main()
  