From 976aa4fbee8a070f362cab6f6ec84e9251a90cf9 Mon Sep 17 00:00:00 2001
From: William Boman <william@redwill.se>
Date: Fri, 8 Jul 2022 18:34:38 +0200
Subject: refactor: add mason-schemas and mason-core modules (#29)

* refactor: add mason-schemas and move generated filetype map to mason-lspconfig

* refactor: add mason-core module
---
 lua/mason-core/EventEmitter.lua | 64 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 lua/mason-core/EventEmitter.lua

(limited to 'lua/mason-core/EventEmitter.lua')

diff --git a/lua/mason-core/EventEmitter.lua b/lua/mason-core/EventEmitter.lua
new file mode 100644
index 00000000..672c1778
--- /dev/null
+++ b/lua/mason-core/EventEmitter.lua
@@ -0,0 +1,64 @@
+---@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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