add queue, message, json parsing

src/queue.ts

@@ -0,0 +1,45 @@
+import * as Events from 'events'
+
+
+export class Queue<T> extends Events.EventEmitter {
+  private q : T[] = []
+
+  constructor() {
+    super()
+  }
+
+  isEmpty() : boolean {
+    return this.q.length == 0
+  }
+
+  knock() {
+    this.emit('data')
+  }
+
+  enq(x : T) {
+    this.q.push(x)
+    this.emit('data')
+  }
+
+  reenq(x : T) {
+    this.q.unshift(x)
+    this.emit('data')
+  }
+
+  deq() : T {
+    var x : T  = this.peek()
+    this.q.shift()
+
+    return x
+  }
+
+  peek() : T {
+    if (this.isEmpty()) {
+      throw new Error("queue is empty")
+    }
+
+    var x : T = this.q[0]
+
+    return x
+  }
+}