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---@class EventEmitter
---@field private __event_handlers table<any, table<fun(), fun()>>
---@field private __event_handlers_once table<any, table<fun(), fun()>>
local EventEmitter = {}
EventEmitter.__index = EventEmitter
---@generic T
---@param obj T
---@return T
function EventEmitter.init(obj)
obj.__event_handlers = {}
obj.__event_handlers_once = {}
return obj
end
---@param event any
function EventEmitter:emit(event, ...)
if self.__event_handlers[event] then
for handler in pairs(self.__event_handlers[event]) do
pcall(handler, ...)
end
end
if self.__event_handlers_once[event] then
for handler in pairs(self.__event_handlers_once[event]) do
pcall(handler, ...)
self.__event_handlers_once[handler] = nil
end
end
end
---@param event any
---@param handler fun(payload: any)
function EventEmitter:on(event, handler)
if not self.__event_handlers[event] then
self.__event_handlers[event] = {}
end
self.__event_handlers[event][handler] = handler
end
---@param event any
---@parma handler fun(payload: any)
function EventEmitter:once(event, handler)
if not self.__event_handlers_once[event] then
self.__event_handlers_once[event] = {}
end
self.__event_handlers_once[event][handler] = handler
end
---@param event any
---@param handler fun(payload: any)
function EventEmitter:off(event, handler)
if vim.tbl_get(self.__event_handlers, { event, handler }) then
self.__event_handlers[event][handler] = nil
return true
end
return false
end
function EventEmitter:clear_event_handlers()
self.__event_handlers = {}
self.__event_handlers_once = {}
end
return EventEmitter
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