1 files changed, 61 insertions, 0 deletions
diff --git a/src/main/kotlin/asyncio.kt b/src/main/kotlin/asyncio.kt
new file mode 100644
index 0000000..e14fea9
--- /dev/null
+++ b/src/main/kotlin/asyncio.kt
@@ -0,0 +1,61 @@
+import kotlin.coroutines.*
+
+class IORunner : Continuation<Unit> {
+	var nextStep: Continuation<Unit>? = null
+	val eventQueue = ArrayDeque<String>()
+	fun _CALLED_BY_JS_onInput(str: String) {
+		eventQueue.addLast(str)
+		awake()
+	}
+
+	fun _CALLED_BY_JS_onWhatever() {
+		awake()
+	}
+
+	private fun awake() {
+		val step = nextStep
+		if (step != null) {
+			nextStep = null
+			step.resume(Unit)
+		}
+	}
+
+	suspend fun wait() {
+		return suspendCoroutine { c ->
+			console.log("SUSPENDING COROUTINE")
+			nextStep = c
+		}
+	}
+
+	override val context: CoroutineContext
+		get() = EmptyCoroutineContext
+
+	override fun resumeWith(result: Result<Unit>) {
+		if (result.isFailure) {
+			result.exceptionOrNull()?.printStackTrace()
+		} else {
+			println("IORunner exited successfully")
+		}
+	}
+
+	companion object {
+		fun runOnIO(block: suspend IORunner.() -> Unit): IORunner {
+			val r = IORunner()
+			block.startCoroutine(r, r)
+			return r
+		}
+	}
+}
+
+
+suspend fun IORunner.getOneKey(): String {
+	while (true) {
+		val x = eventQueue.removeFirstOrNull()
+		if (x == null)
+			wait()
+		else {
+			return x
+		}
+	}
+}
+