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/usr/lib/python3/dist-packages/crank/dispatchstate.py is in python3-crank 0.7.2-3.

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"""
This module implements the :class:`DispatchState` class
"""
from crank.util import default_path_translator, noop_translation

try:
    string_type = basestring
except NameError: # pragma: no cover
    string_type = str


class DispatchState(object):
    """
    This class keeps around all the pertainent info for the state
    of the dispatch as it traverses through the tree.  This allows
    us to attach things like routing args and to keep track of the
    path the controller takes along the system.
    
    Arguments:
        request 
              object, must have a path_info attribute if path_info is not provided
        dispatcher
              dispatcher object to get the ball rolling
        params
              parameters to pass into the dispatch state will use request.params
        path_info
              pre-split list of path elements, will use request.pathinfo if not used
        strip_extension
              Whenever crank should strip the url extension or not resolving the path
        path_translator
              Function used to perform path escaping when looking for controller methods,
              can be None to perform no escaping or True to use default escaping function.
    """

    def __init__(self, request, dispatcher=None, params=None, path_info=None,
                 ignore_parameters=None, strip_extension=True, path_translator=None):
        path = path_info
        if path is None:
            path = request.path_info[1:]
            path = path.split('/')
        elif isinstance(path, string_type):
            path = path.split('/')

        try:
            if not path[0]:
                path = path[1:]
        except IndexError:
            pass

        try:
            while not path[-1]:
                path = path[:-1]
        except IndexError:
            pass

        if path_translator is None:
            path_translator = noop_translation
        elif path_translator is True:
            path_translator = default_path_translator

        self.request = request
        self.extension = None
        self.path_translator = path_translator

        #rob the extension
        if strip_extension and len(path) > 0 and '.' in path[-1]:
            end = path[-1]
            end, ext = end.rsplit('.', 1)
            self.extension = ext
            path[-1] = end

        self.path = path

        if params is not None:
            self.params = params
        else:
            self.params = request.params

        #remove the ignore params from self.params
        if ignore_parameters:
            remove_params = ignore_parameters
            for param in remove_params:
                if param in self.params:
                    del self.params[param]

        self.controller = None
        self.controller_path = []
        self.routing_args = {}
        self.method = None
        self.remainder = None
        self.dispatcher = dispatcher
        self.add_controller('/', dispatcher)
        self._notfound_stack = []

    def add_controller(self, location, controller):
        """Add a controller object to the stack"""
        self.controller = controller
        self.controller_path.append((location, controller))

    def add_method(self, method, remainder):
        """Add the final method that will be called in the _call method"""
        self.method = method
        self.remainder = remainder

    def add_routing_args(self, current_path, remainder, fixed_args, var_args):
        """
        Add the "intermediate" routing args for a given controller mounted
        at the current_path
        """
        i = 0
        for i, arg in enumerate(fixed_args):
            if i >= len(remainder):
                break
            self.routing_args[arg] = remainder[i]
        remainder = remainder[i:]
        if var_args and remainder:
            self.routing_args[current_path] = remainder