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Added impementation of "prefallbacks" list. #2764

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Added impementation of "prefallbacks" list. #2764

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6b8533d
Added impementation of "prefallbacks" list.
david-shiko Nov 5, 2021
12e0dd8
Update conversationhandler.py
david-shiko Nov 5, 2021
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16 changes: 16 additions & 0 deletions telegram/ext/conversationhandler.py
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Original file line number Diff line number Diff line change
Expand Up @@ -190,6 +190,7 @@ class ConversationHandler(Handler[Update, CCT]):
'_entry_points',
'_states',
'_fallbacks',
'_prefallbacks',
'_allow_reentry',
'_per_user',
'_per_chat',
Expand Down Expand Up @@ -219,6 +220,7 @@ def __init__(
entry_points: List[Handler[Update, CCT]],
states: Dict[object, List[Handler[Update, CCT]]],
fallbacks: List[Handler[Update, CCT]],
prefallbacks: List[Handler[Update, CCT]] = List(),
allow_reentry: bool = False,
per_chat: bool = True,
per_user: bool = True,
Expand All @@ -232,6 +234,7 @@ def __init__(
self.run_async = run_async

self._entry_points = entry_points
self._prefallbacks = prefallbacks
self._states = states
self._fallbacks = fallbacks

Expand Down Expand Up @@ -267,6 +270,7 @@ def __init__(

all_handlers: List[Handler] = []
all_handlers.extend(entry_points)
all_handlers.extend(prefallbacks)
all_handlers.extend(fallbacks)

for state_handlers in states.values():
Expand Down Expand Up @@ -323,6 +327,18 @@ def entry_points(self) -> List[Handler]:
@entry_points.setter
def entry_points(self, value: object) -> NoReturn:
raise ValueError('You can not assign a new value to entry_points after initialization.')

@property
def prefallbacks(self) -> List[Handler]:
"""List[:class:`telegram.ext.Handler`]: A list of handlers that might be used if
the user is in a conversation. This list of handlers will be processed before all the others handlers.
This list helps to reduce usage of "and not" filters.
"""
return self._prefallbacks

@prefallbacks.setter
def prefallbacks(self, value: object) -> NoReturn:
raise ValueError('You can not assign a new value to prefallbacks after initialization.')

@property
def states(self) -> Dict[object, List[Handler]]:
Expand Down
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