web.py 文件源码

def __call__(self, request):
        """Called by HTTPServer to execute the request."""
        transforms = [t(request) for t in self.transforms]
        handler = None
        args = []
        kwargs = {}
        handlers = self._get_host_handlers(request)

        if not handlers:
            handler = RedirectHandler(
                request, "http://" + self.default_host + "/")
        else:
            for spec in handlers:
                match = spec.regex.match(request.path)
                if match:
                    # None-safe wrapper around urllib.unquote to handle
                    # unmatched optional groups correctly
                    def unquote(s):
                        if s is None: return s
                        return urllib.unquote(s)
                    handler = spec.handler_class(self, request, **spec.kwargs)
                    # Pass matched groups to the handler.  Since
                    # match.groups() includes both named and unnamed groups,
                    # we want to use either groups or groupdict but not both.
                    kwargs = dict((k, unquote(v))
                                  for (k, v) in match.groupdict().iteritems())
                    if kwargs:
                        args = []
                    else:
                        args = [unquote(s) for s in match.groups()]
                    break
            if not handler:
                handler = ErrorHandler(self, request, 404)

        # In debug mode, re-compile templates and reload static files on every
        # request so you don't need to restart to see changes
        if self.settings.get("debug"):
            if getattr(RequestHandler, "_templates", None):
              map(lambda loader: loader.reset(),
                  RequestHandler._templates.values())
            RequestHandler._static_hashes = {}

        # ????????:
        handler._execute(transforms, *args, **kwargs)
        return handler