3 files changed, 93 insertions, 2 deletions
diff --git a/src/content/domains/KeySequence.ts b/src/content/domains/KeySequence.ts
new file mode 100644
index 0000000..4534b60
--- /dev/null
+++ b/src/content/domains/KeySequence.ts
@@ -0,0 +1,91 @@
+import Key from '../../shared/settings/Key';
+
+export default class KeySequence {
+  constructor(
+    public readonly keys: Key[],
+  ) {
+  }
+
+  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 (!this.keys[i].equals(o.keys[i])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  isDigitOnly(): boolean {
+    return this.keys.every(key => key.isDigit());
+  }
+
+  repeatCount(): number {
+    let nonDigitAt = this.keys.findIndex(key => !key.isDigit());
+    if (this.keys.length === 0 || nonDigitAt === 0) {
+      return 1;
+    }
+    if (nonDigitAt === -1) {
+      nonDigitAt = this.keys.length;
+    }
+    let digits = this.keys.slice(0, nonDigitAt)
+      .map(key => key.key)
+      .join('');
+    return Number(digits);
+  }
+
+  trimNumericPrefix(): KeySequence {
+    let nonDigitAt = this.keys.findIndex(key => !key.isDigit());
+    if (nonDigitAt === -1) {
+      nonDigitAt = this.keys.length;
+    }
+    return new KeySequence(this.keys.slice(nonDigitAt));
+  }
+
+  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[],
+    ): Key[] => {
+      if (remaining.length === 0) {
+        return mappedKeys;
+      }
+
+      let nextPos = 1;
+      if (remaining.startsWith('<')) {
+        let ltPos = remaining.indexOf('>');
+        if (ltPos > 0) {
+          nextPos = ltPos + 1;
+        }
+      }
+
+      return fromMapKeysRecursive(
+        remaining.slice(nextPos),
+        mappedKeys.concat([Key.fromMapKey(remaining.slice(0, nextPos))])
+      );
+    };
+
+    let data = fromMapKeysRecursive(keys, []);
+    return new KeySequence(data);
+  }
+}
diff --git a/src/content/repositories/KeymapRepository.ts b/src/content/repositories/KeymapRepository.ts
index 3391229..2944723 100644
--- a/src/content/repositories/KeymapRepository.ts
+++ b/src/content/repositories/KeymapRepository.ts
@@ -1,5 +1,5 @@
 import Key from '../../shared/settings/Key';
-import KeySequence from '../../shared/settings/KeySequence';
+import KeySequence from '../domains/KeySequence';
 
 export default interface KeymapRepository {
   enqueueKey(key: Key): KeySequence;
diff --git a/src/content/usecases/KeymapUseCase.ts b/src/content/usecases/KeymapUseCase.ts
index 67d667d..1707f6f 100644
--- a/src/content/usecases/KeymapUseCase.ts
+++ b/src/content/usecases/KeymapUseCase.ts
@@ -5,7 +5,7 @@ import AddonEnabledRepository from '../repositories/AddonEnabledRepository';
 import * as operations from '../../shared/operations';
 import Keymaps from '../../shared/settings/Keymaps';
 import Key from '../../shared/settings/Key';
-import KeySequence from '../../shared/settings/KeySequence';
+import KeySequence from '../domains/KeySequence';
 import AddressRepository from '../repositories/AddressRepository';
 
 type KeymapEntityMap = Map<KeySequence, operations.Operation>;