diff --git a/src/common/parser/WindowOptions.ts b/src/common/parser/WindowOptions.ts
new file mode 100644
index 00000000..a75faa63
--- /dev/null
+++ b/src/common/parser/WindowOptions.ts
@@ -0,0 +1,137 @@
+/**
+ * Copyright (c) 2019 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+interface IWindowOptions {
+  [key: string]: boolean | undefined;
+  restoreWin?: boolean;
+  minimizeWin?: boolean;
+  setWinPosition?: boolean;
+  setWinSizePixels?: boolean;
+  raiseWin?: boolean;
+  lowerWin?: boolean;
+  refreshWin?: boolean;
+  setWinSizeChars?: boolean;
+  maximizeWin?: boolean;
+  fullscreenWin?: boolean;
+  getWinState?: boolean;
+  getWinPosition?: boolean;
+  getWinSizePixels?: boolean;
+  getScreenSizePixels?: boolean;
+  getCellSizePixels?: boolean;
+  getWinSizeChars?: boolean;
+  getScreenSizeChars?: boolean;
+  getIconTitle?: boolean;
+  getWinTitle?: boolean;
+  pushTitle?: boolean;
+  popTitle?: boolean;
+  setWinLines?: boolean;
+}
+
+const enum WindowOptions {
+  restoreWin = 1 << 1,
+  minimizeWin = 1 << 2,
+  setWinPosition = 1 << 3,
+  setWinSizePixels = 1 << 4,
+  raiseWin = 1 << 5,
+  lowerWin = 1 << 6,
+  refreshWin = 1 << 7,
+  setWinSizeChars = 1 << 8,
+  maximizeWin = 1 << 9,
+  fullscreenWin = 1 << 10,
+  getWinState = 1 << 11,
+  getWinPosition = 1 << 13,
+  getWinSizePixels = 1 << 14,
+  getScreenSizePixels = 1 << 15,  // note: name not in xterm
+  getCellSizePixels = 1 << 16,    // note: name not in xterm
+  getWinSizeChars = 1 << 18,
+  getScreenSizeChars = 1 << 19,
+  getIconTitle = 1 << 20,
+  getWinTitle = 1 << 21,
+  pushTitle = 1 << 22,
+  popTitle = 1 << 23,
+  setWinLines = 1 << 24           // any param >= 24, also handles DECCOLM
+}
+
+let layer: {[key in keyof typeof WindowOptions]?: boolean}
+
+function hasOption(n: number, opts: WindowOptions): boolean {
+  return !!(opts & (1 << Math.max(n, 24)));
+}
+
+function getOptions(opts: WindowOptions): IWindowOptions {
+  /*
+  const result: IWindowOptions = {};
+  for (const key in WindowOptions) {
+    if (parseInt(key)) continue;
+    result[key] = !!(opts & WindowOptions[key as any] as unknown as number);
+  }
+  return result;
+  */
+  return {
+    restoreWin: !!(opts & WindowOptions.restoreWin),
+    minimizeWin: !!(opts & WindowOptions.minimizeWin),
+    setWinPosition: !!(opts & WindowOptions.setWinPosition),
+    setWinSizePixels: !!(opts & WindowOptions.setWinSizePixels),
+    raiseWin: !!(opts & WindowOptions.raiseWin),
+    lowerWin: !!(opts & WindowOptions.lowerWin),
+    refreshWin: !!(opts & WindowOptions.refreshWin),
+    setWinSizeChars: !!(opts & WindowOptions.setWinSizeChars),
+    maximizeWin: !!(opts & WindowOptions.maximizeWin),
+    fullscreenWin: !!(opts & WindowOptions.fullscreenWin),
+    getWinState: !!(opts & WindowOptions.getWinState),
+    getWinPosition: !!(opts & WindowOptions.getWinPosition),
+    getWinSizePixels: !!(opts & WindowOptions.getWinSizePixels),
+    getScreenSizePixels: !!(opts & WindowOptions.getScreenSizePixels),
+    getCellSizePixels: !!(opts & WindowOptions.getCellSizePixels),
+    getWinSizeChars: !!(opts & WindowOptions.getWinSizeChars),
+    getScreenSizeChars: !!(opts & WindowOptions.getScreenSizeChars),
+    getIconTitle: !!(opts & WindowOptions.getIconTitle),
+    getWinTitle: !!(opts & WindowOptions.getWinTitle),
+    pushTitle: !!(opts & WindowOptions.pushTitle),
+    popTitle: !!(opts & WindowOptions.popTitle),
+    setWinLines: !!(opts & WindowOptions.setWinLines)
+  };
+}
+
+function setOptions(v: IWindowOptions & {[key: string]: boolean}, opts: WindowOptions): WindowOptions {
+  for (const optionName in v) {
+    const value = v[optionName];
+    //const option = WindowOptions[optionName as any] as unknown as number;
+    //opts = value ? opts | option : opts & ~option;
+    switch (optionName) {
+      case 'restoreWin': opts = value ? opts | WindowOptions.restoreWin : opts & ~WindowOptions.restoreWin; break;
+      case 'minimizeWin': opts = value ? opts | WindowOptions.minimizeWin : opts & ~WindowOptions.minimizeWin; break;
+      case 'setWinPosition': opts = value ? opts | WindowOptions.setWinPosition : opts & ~WindowOptions.setWinPosition; break;
+      case 'setWinSizePixels': opts = value ? opts | WindowOptions.setWinSizePixels : opts & ~WindowOptions.setWinSizePixels; break;
+      case 'raiseWin': opts = value ? opts | WindowOptions.raiseWin : opts & ~WindowOptions.raiseWin; break;
+      case 'lowerWin': opts = value ? opts | WindowOptions.lowerWin : opts & ~WindowOptions.lowerWin; break;
+      case 'refreshWin': opts = value ? opts | WindowOptions.refreshWin : opts & ~WindowOptions.refreshWin; break;
+      case 'setWinSizeChars': opts = value ? opts | WindowOptions.setWinSizeChars : opts & ~WindowOptions.setWinSizeChars; break;
+      case 'maximizeWin': opts = value ? opts | WindowOptions.maximizeWin : opts & ~WindowOptions.maximizeWin; break;
+      case 'fullscreenWin': opts = value ? opts | WindowOptions.fullscreenWin : opts & ~WindowOptions.fullscreenWin; break;
+      case 'getWinState': opts = value ? opts | WindowOptions.getWinState : opts & ~WindowOptions.getWinState; break;
+      case 'getWinPosition': opts = value ? opts | WindowOptions.getWinPosition : opts & ~WindowOptions.getWinPosition; break;
+      case 'getWinSizePixels': opts = value ? opts | WindowOptions.getWinSizePixels : opts & ~WindowOptions.getWinSizePixels; break;
+      case 'getScreenSizePixels': opts = value ? opts | WindowOptions.getScreenSizePixels : opts & ~WindowOptions.getScreenSizePixels; break;
+      case 'getCellSizePixels': opts = value ? opts | WindowOptions.getCellSizePixels : opts & ~WindowOptions.getCellSizePixels; break;
+      case 'getWinSizeChars': opts = value ? opts | WindowOptions.getWinSizeChars : opts & ~WindowOptions.getWinSizeChars; break;
+      case 'getScreenSizeChars': opts = value ? opts | WindowOptions.getScreenSizeChars : opts & ~WindowOptions.getScreenSizeChars; break;
+      case 'getIconTitle': opts = value ? opts | WindowOptions.getIconTitle : opts & ~WindowOptions.getIconTitle; break;
+      case 'getWinTitle': opts = value ? opts | WindowOptions.getWinTitle : opts & ~WindowOptions.getWinTitle; break;
+      case 'pushTitle': opts = value ? opts | WindowOptions.pushTitle : opts & ~WindowOptions.pushTitle; break;
+      case 'popTitle': opts = value ? opts | WindowOptions.popTitle : opts & ~WindowOptions.popTitle; break;
+      case 'setWinLines': opts = value ? opts | WindowOptions.setWinLines : opts & ~WindowOptions.setWinLines; break;
+      default: throw new Error(`unknown WindowOption "${optionName}"`);
+    }
+  }
+  return opts;
+}
+
+declare const console: any;
+let opts: WindowOptions = 0;
+
+opts = setOptions({refreshWin: true, pushTitle: true, popTitle: true}, opts);
+console.log(opts);
+console.log(getOptions(opts));