1 files changed, 55 insertions, 0 deletions
diff --git a/src/components/background-input.js b/src/components/background-input.js
new file mode 100644
index 0000000..9c6ef1c
--- /dev/null
+++ b/src/components/background-input.js
@@ -0,0 +1,55 @@
+import * as inputActions from '../actions/input';
+import * as keys from '../shared/keys';
+import * as operationActions from '../actions/operation';
+
+export default class BackgroundInputComponent {
+  constructor(store) {
+    this.store = store;
+    this.keymaps = {};
+    this.prevInputs = [];
+  }
+
+  update(sender) {
+    let state = this.store.getState();
+    this.reloadSettings(state.setting);
+    this.handleKeyInputs(sender, state.input);
+  }
+
+  reloadSettings(setting) {
+    if (!setting.settings.json) {
+      return;
+    }
+    this.keymaps = JSON.parse(setting.settings.json).keymaps;
+  }
+
+  handleKeyInputs(sender, input) {
+    if (JSON.stringify(this.prevInputs) === JSON.stringify(input)) {
+      return;
+    }
+    this.prevInputs = input;
+
+    if (input.keys.length === 0) {
+      return;
+    }
+    if (sender) {
+      return this.handleKeysChanged(sender, input);
+    }
+  }
+
+  handleKeysChanged(sender, input) {
+    let prefix = keys.asKeymapChars(input.keys);
+    let matched = Object.keys(this.keymaps).filter((keyStr) => {
+      return keyStr.startsWith(prefix);
+    });
+    if (matched.length === 0) {
+      this.store.dispatch(inputActions.clearKeys(), sender);
+      return Promise.resolve();
+    } else if (matched.length > 1 ||
+      matched.length === 1 && prefix !== matched[0]) {
+      return Promise.resolve();
+    }
+    let operation = this.keymaps[matched];
+    this.store.dispatch(operationActions.exec(operation, sender.tab), sender);
+    this.store.dispatch(inputActions.clearKeys(), sender);
+  }
+}