support app framework base library in assemblyscript (#164)

assembly-script/wamr_app_lib/timer.ts

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2019 Intel Corporation.  All rights reserved.
+ * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+ */
+
+@external("env", "wasm_create_timer")
+declare function wasm_create_timer(a: i32, b: bool, c: bool): i32;
+
+@external("env", "wasm_timer_cancel")
+declare function wasm_timer_cancel(a: i32): void;
+
+@external("env", "wasm_timer_restart")
+declare function wasm_timer_restart(a: i32, b: i32): void;
+
+@external("env", "wasm_get_sys_tick_ms")
+declare function wasm_get_sys_tick_ms(): i32;
+
+export var timer_list = new Array<user_timer>();
+
+export class user_timer {
+    timer_id: i32 = 0;
+    timeout: i32;
+    period: bool = false;
+    cb: () => void;
+
+    constructor(cb: () => void, timeout: i32, period: bool) {
+        this.cb = cb;
+        this.timeout = timeout;
+        this.period = period
+        this.timer_id = timer_create(this.timeout, this.period, true);
+    }
+}
+
+export function timer_create(a: i32, b: bool, c: bool): i32 {
+    return wasm_create_timer(a, b, c);
+}
+
+export function setTimeout(cb: () => void, timeout: i32): user_timer {
+    var timer = new user_timer(cb, timeout, false);
+    timer_list.push(timer);
+
+    return timer;
+}
+
+export function setInterval(cb: () => void, timeout: i32): user_timer {
+    var timer = new user_timer(cb, timeout, true);
+    timer_list.push(timer);
+
+    return timer;
+}
+
+export function timer_cancel(timer: user_timer): void {
+    wasm_timer_cancel(timer.timer_id);
+
+    var i = 0;
+    for (i = 0; i < timer_list.length; i++) {
+        if (timer_list[i].timer_id == timer.timer_id)
+            break;
+    }
+
+    timer_list.splice(i, 1);
+}
+
+export function timer_restart(timer: user_timer, interval: number): void {
+    wasm_timer_restart(timer.timer_id, i32(interval));
+}
+
+export function now(): i32 {
+    return wasm_get_sys_tick_ms();
+}
+
+// This export function need to be copied to the top application file
+//
+export function on_timer_callback(on_timer_id: i32): void {
+    for (let i = 0; i < timer_list.length; i++) {
+        if (timer_list[i].timer_id == on_timer_id) {
+            timer_list[i].cb();
+        }
+    }
+}