1 files changed, 38 insertions, 0 deletions
diff --git a/src/background/key-queue.js b/src/background/key-queue.js
new file mode 100644
index 0000000..e21399e
--- /dev/null
+++ b/src/background/key-queue.js
@@ -0,0 +1,38 @@
+import * as keys from './keys';
+import * as actions from '../shared/actions';
+
+const DEFAULT_KEYMAP = [
+  { keys: [{ code: KeyboardEvent.DOM_VK_K }], action: [ actions.SCROLL_UP, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_J }], action: [ actions.SCROLL_DOWN, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_G }, { code: KeyboardEvent.DOM_VK_G }], action: [ actions.SCROLL_TOP ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_G, shift: true }], action: [ actions.SCROLL_BOTTOM ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_H }], action: [ actions.TABS_PREV, 1 ]},
+  { keys: [{ code: KeyboardEvent.DOM_VK_L }], action: [ actions.TABS_NEXT, 1 ]},
+]
+
+export default class KeyQueue {
+
+  constructor(keymap) {
+    this.data = [];
+    this.keymap = keymap;
+  }
+
+  push(key) {
+    this.data.push(key);
+    let filtered = DEFAULT_KEYMAP.filter((map) => {
+      return keys.hasPrefix(map.keys, this.data)
+    });
+
+    if (filtered.length == 0) {
+      this.data = [];
+      return;
+    } else if (filtered.length == 1) {
+      let map = filtered[0];
+      if (map.keys.length == this.data.length) {
+        this.data = [];
+        return map.action;
+      }
+    }
+    return null;
+  }
+}