Create InputHandler which performs C0 actions

Part of #459

src/InputHandler.ts

@@ -0,0 +1,50 @@
+import { IInputHandler, ITerminal } from './Interfaces';
+
+export class InputHandler implements IInputHandler {
+  // TODO: We want to type _terminal when it's pulled into TS
+  constructor(private _terminal: any) { }
+
+  public bell(): void {
+    if (!this._terminal.visualBell) {
+      return;
+    }
+    this._terminal.element.style.borderColor = 'white';
+    setTimeout(() => this._terminal.element.style.borderColor = '', 10);
+    if (this._terminal.popOnBell) {
+      this._terminal.focus();
+    }
+  }
+
+  public lineFeed(): void {
+    if (this._terminal.convertEol) {
+      this._terminal.x = 0;
+    }
+    this._terminal.y++;
+    if (this._terminal.y > this._terminal.scrollBottom) {
+      this._terminal.y--;
+      this._terminal.scroll();
+    }
+  }
+
+  public carriageReturn(): void {
+    this._terminal.x = 0;
+  }
+
+  public backspace(): void {
+    if (this._terminal.x > 0) {
+      this._terminal.x--;
+    }
+  }
+
+  public tab(): void {
+    this._terminal.x = this._terminal.nextStop();
+  }
+
+  public shiftOut(): void {
+    this._terminal.setgLevel(1);
+  }
+
+  public shiftIn(): void {
+    this._terminal.setgLevel(0);
+  }
+}