33 lines
939 B
Nim
33 lines
939 B
Nim
discard """
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output: "pie"
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"""
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import tables, lists
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type
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EventArgs = object of RootObj
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EventEmitter = object of RootObj
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events*: Table[string, DoublyLinkedList[proc(e: EventArgs) {.nimcall.}]]
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proc emit*(emitter: EventEmitter, event: string, args: EventArgs) =
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for func in nodes(emitter.events[event]):
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func.value(args) #call function with args.
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proc on*(emitter: var EventEmitter, event: string,
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func: proc(e: EventArgs) {.nimcall.}) =
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if not hasKey(emitter.events, event):
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var list: DoublyLinkedList[proc(e: EventArgs) {.nimcall.}]
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add(emitter.events, event, list) #if not, add it.
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append(emitter.events.mget(event), func)
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proc initEmitter(emitter: var EventEmitter) =
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emitter.events = initTable[string,
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DoublyLinkedList[proc(e: EventArgs) {.nimcall.}]]()
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var
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ee: EventEmitter
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args: EventArgs
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initEmitter(ee)
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ee.on("print", proc(e: EventArgs) = echo("pie"))
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ee.emit("print", args)
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