Static Analysis Adventures in Python

handlers.py

class Welcome(Handler):
  def handle(self, request):
    if request.user.is_logged_in:
      return request.redirect('Feed')
    else:
      return request.redirect('SignIn')

class SignIn(Handler):
  /* Do stuff here */
  next_handler = 'Feed'

class Feed(Handler):
  def handle(self, request):
    self.display("What's happening")
    self.quit()

class LegacySignIn(Handler):
  def handle(self, request):
    if request.user.has_active_subscription:
      return request.redirect('LegacyFeed')
    else:
      self.display('Please supply your credentials')
    

class LegacyFeed(Handler):
  def handle(self, request):
    self.display("What happened back then")
    self.quit()
    
class SomeUtilityClass:
  def do_useful_stuff(self):
    return self.done()

journey_detector.py

from ast import parse

def is_handler(ast_node):
  # implement introspection

def get_ast(file_path):
  with open(file_path) as source_file:
    source = source_file.read()
    tree = ast.parse(source).body
    return tree
  
def get_handler_nodes(tree):
  return filter(is_handler, tree)