text: import inspect
  from amitools.vamos.astructs import LibraryStruct
  from amitools.vamos.error import VamosInternalError
  
  
  class LibImpl(object):
      """base class for all Python-based library implementations"""
  
      def get_struct_def(self):
          """return the structure of your library pos_size"""
          return LibraryStruct
  
      def get_version(self):
          return 40
  
      def setup_lib(self, ctx, base_addr):
          pass
  
      def finish_lib(self, ctx):
          pass
  
      def open_lib(self, ctx, open_cnt):
          pass
  
      def close_lib(self, ctx, open_cnt):
          pass
  
  
  class LibImplScan(object):
      """scan result of a vamos library implementation
  
       it contains extracted function lists"""
  
      TAG_VALID = "valid"
      TAG_ERROR = "error"
      TAG_INVALID = "invalid"
      TAG_MISSING = "missing"
  
      def __init__(self, name, impl, fd):
          self.name = name
          self.impl = impl
          self.fd = fd
          self.valid_funcs = {}
          self.missing_funcs = {}
          self.invalid_funcs = {}
          self.error_funcs = {}
          self.func_tags = {}
  
      def get_name(self):
          return self.name
  
      def get_impl(self):
          return self.impl
  
      def get_fd(self):
          return self.fd
  
      def get_valid_funcs(self):
          """return map: name -> (fd_func, method)"""
          return self.valid_funcs
  
      def get_missing_funcs(self):
          """return map: name -> fd_func"""
          return self.missing_funcs
  
      def get_invalid_funcs(self):
          """return map: name -> method"""
          return self.invalid_funcs
  
      def get_error_funcs(self):
          """return map: name -> (fd_func, method)"""
          return self.error_funcs
  
      def get_valid_func_names(self):
          return sorted(self.valid_funcs.keys())
  
      def get_missing_func_names(self):
          return sorted(self.missing_funcs.keys())
  
      def get_invalid_func_names(self):
          return sorted(self.invalid_funcs.keys())
  
      def get_error_func_names(self):
          return sorted(self.error_funcs.keys())
  
      def get_num_valid_funcs(self):
          return len(self.valid_funcs)
  
      def get_num_missing_funcs(self):
          return len(self.missing_funcs)
  
      def get_num_invalid_funcs(self):
          return len(self.invalid_funcs)
  
      def get_num_error_funcs(self):
          return len(self.error_funcs)
  
      def get_func_tags(self):
          """return a map of name -> tag"""
          return self.func_tags
  
  
  class LibImplScanner(object):
      """scan an implementation of a library for functions"""
  
      def scan(self, name, impl, fd, inc_std_funcs=False):
          """scan a library implementation with a functable"""
          res = LibImplScan(name, impl, fd)
          found_names = []
          members = inspect.getmembers(impl, predicate=inspect.ismethod)
          for name, method in members:
              tag = None
              # is a func in the fd?
              if fd.has_func(name):
                  func = fd.get_func_by_name(name)
                  if self._check_argspec(method):
                      res.valid_funcs[name] = (func, method)
                      tag = LibImplScan.TAG_VALID
                  else:
                      res.error_funcs[name] = (func, method)
                      tag = LibImplScan.TAG_ERROR
                  found_names.append(name)
              # not a func name
              else:
                  # if name is camel case then it is invalid
                  if name[0].isupper():
                      res.invalid_funcs[name] = method
                      tag = LibImplScan.TAG_INVALID
              # store func tag
              if tag:
                  res.func_tags[name] = tag
          # now check for missing functions
          funcs = fd.get_funcs()
          if len(funcs) != len(found_names):
              for func in funcs:
                  # skip std functions
                  if inc_std_funcs or not func.is_std():
                      name = func.get_name()
                      if name not in found_names:
                          res.missing_funcs[name] = func
                          res.func_tags[name] = LibImplScan.TAG_MISSING
          # return scan result
          return res
  
      def scan_checked(self, name, impl, fd, inc_std_funcs=False, ignore_invalid=False):
          res = self.scan(name, impl, fd, inc_std_funcs)
          # raise an error if impl is not valid
          num_invalid = res.get_num_invalid_funcs()
          num_error = res.get_num_error_funcs()
          if num_invalid > 0 and not ignore_invalid:
              names = res.get_invalid_func_names()
              txt = ",".join(names)
              raise VamosInternalError(
                  "'%s' impl has %d invalid funcs: %s" % (name, num_invalid, txt)
              )
          if num_error > 0:
              names = res.get_error_func_names()
              txt = ",".join(names)
              raise VamosInternalError(
                  "'%s' impl has %d error funcs: %s" % (name, num_error, txt)
              )
  
      def _check_argspec(self, method):
          fas = inspect.getfullargspec(method)
          if fas.varargs is not None:
              return False
          if fas.varkw is not None:
              return False
          if fas.defaults is not None:
              return False
          return fas.args == ["self", "ctx"]
  