2 files changed, 32 insertions, 5 deletions
diff --git a/src/shared/settings/Key.ts b/src/shared/settings/Key.ts
index b11eeb2..3a3eb3b 100644
--- a/src/shared/settings/Key.ts
+++ b/src/shared/settings/Key.ts
@@ -1,3 +1,5 @@
+const digits = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];
+
 export default class Key {
   public readonly key: string;
 
@@ -9,12 +11,18 @@ export default class Key {
 
   public readonly meta: boolean;
 
-  constructor({ key, shift, ctrl, alt, meta }: {
+  constructor({
+    key,
+    shift = false,
+    ctrl = false,
+    alt = false,
+    meta = false,
+  }: {
     key: string;
-    shift: boolean;
-    ctrl: boolean;
-    alt: boolean;
-    meta: boolean;
+    shift?: boolean;
+    ctrl?: boolean;
+    alt?: boolean;
+    meta?: boolean;
   }) {
     this.key = key;
     this.shift = shift;
@@ -51,6 +59,10 @@ export default class Key {
     });
   }
 
+  isDigit(): boolean {
+    return digits.includes(this.key);
+  }
+
   equals(key: Key) {
     return this.key === key.key &&
       this.ctrl === key.ctrl &&
diff --git a/src/shared/settings/KeySequence.ts b/src/shared/settings/KeySequence.ts
index abae61a..de1c6bb 100644
--- a/src/shared/settings/KeySequence.ts
+++ b/src/shared/settings/KeySequence.ts
@@ -26,6 +26,21 @@ export default class KeySequence {
     return true;
   }
 
+  isDigitOnly(): boolean {
+    return this.keys.every(key => key.isDigit());
+  }
+
+  splitNumericPrefix(): [KeySequence, KeySequence] {
+    let nonDigitIndex = this.keys.findIndex(key => !key.isDigit());
+    if (nonDigitIndex === -1) {
+      return [this, new KeySequence([])];
+    }
+    return [
+      new KeySequence(this.keys.slice(0, nonDigitIndex)),
+      new KeySequence(this.keys.slice(nonDigitIndex)),
+    ];
+  }
+
   static fromMapKeys(keys: string): KeySequence {
     const fromMapKeysRecursive = (
       remaining: string, mappedKeys: Key[],