1 files changed, 64 insertions, 0 deletions
diff --git a/src/content/domains/KeySequence.ts b/src/content/domains/KeySequence.ts
new file mode 100644
index 0000000..6a05c2f
--- /dev/null
+++ b/src/content/domains/KeySequence.ts
@@ -0,0 +1,64 @@
+import Key, * as keyUtils from './Key';
+
+export default class KeySequence {
+  private keys: Key[];
+
+  private constructor(keys: Key[]) {
+    this.keys = keys;
+  }
+
+  static from(keys: Key[]): KeySequence {
+    return new KeySequence(keys);
+  }
+
+  push(key: Key): number {
+    return this.keys.push(key);
+  }
+
+  length(): number {
+    return this.keys.length;
+  }
+
+  startsWith(o: KeySequence): boolean {
+    if (this.keys.length < o.keys.length) {
+      return false;
+    }
+    for (let i = 0; i < o.keys.length; ++i) {
+      if (!keyUtils.equals(this.keys[i], o.keys[i])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  getKeyArray(): Key[] {
+    return this.keys;
+  }
+}
+
+export const fromMapKeys = (keys: string): KeySequence => {
+  const fromMapKeysRecursive = (
+    remainings: string, mappedKeys: Key[],
+  ): Key[] => {
+    if (remainings.length === 0) {
+      return mappedKeys;
+    }
+
+    let nextPos = 1;
+    if (remainings.startsWith('<')) {
+      let ltPos = remainings.indexOf('>');
+      if (ltPos > 0) {
+        nextPos = ltPos + 1;
+      }
+    }
+
+    return fromMapKeysRecursive(
+      remainings.slice(nextPos),
+      mappedKeys.concat([keyUtils.fromMapKey(remainings.slice(0, nextPos))])
+    );
+  };
+
+  let data = fromMapKeysRecursive(keys, []);
+  return KeySequence.from(data);
+};
+