not_flask.py

import re


class NotFlask():
    def __init__(self):
        self.routes = []

    @staticmethod
    def build_route_pattern(route):
        route_regex = re.sub(r'(<\w+?>)', r'(?P\1.*?)(?=/)', route)
        return re.compile("^{}$".format(route_regex))

    def route(self, route_str):
        def decorator(f):
            route_pattern = self.build_route_pattern(route_str)
            self.routes.append((route_pattern, f))

            return f

        return decorator

    def get_route_match(self, path):
        for route_pattern, view_function in self.routes:
            m = route_pattern.match(path)
            if m:
                return m.groupdict(), view_function

        return None

    def serve(self, path):
        route_match = self.get_route_match(path)
        if route_match:
            kwargs, view_function = route_match
            return view_function(**kwargs)
        else:
            raise ValueError('Route "{}"" has not been registered'.format(path))