From c4dcdff9844e2404e3bc035f4cea9fce2f7770ab Mon Sep 17 00:00:00 2001
From: Shin'ya Ueoka <ueokande@i-beam.org>
Date: Sun, 19 May 2019 15:40:23 +0900
Subject: Add HintKeyProducer
---
src/content/usecases/FollowMasterUseCase.ts | 2 +-
src/content/usecases/HintKeyProducer.ts | 38 +++++++++++++++++++++++++++++
2 files changed, 39 insertions(+), 1 deletion(-)
create mode 100644 src/content/usecases/HintKeyProducer.ts
(limited to 'src')
diff --git a/src/content/usecases/FollowMasterUseCase.ts b/src/content/usecases/FollowMasterUseCase.ts
index c2c6835..9cbb790 100644
--- a/src/content/usecases/FollowMasterUseCase.ts
+++ b/src/content/usecases/FollowMasterUseCase.ts
@@ -4,7 +4,7 @@ import FollowMasterRepository, { FollowMasterRepositoryImpl }
from '../repositories/FollowMasterRepository';
import FollowSlaveClient, { FollowSlaveClientImpl }
from '../client/FollowSlaveClient';
-import HintKeyProducer from '../hint-key-producer';
+import HintKeyProducer from './HintKeyProducer';
import SettingRepository, { SettingRepositoryImpl }
from '../repositories/SettingRepository';
diff --git a/src/content/usecases/HintKeyProducer.ts b/src/content/usecases/HintKeyProducer.ts
new file mode 100644
index 0000000..241cd56
--- /dev/null
+++ b/src/content/usecases/HintKeyProducer.ts
@@ -0,0 +1,38 @@
+export default class HintKeyProducer {
+ private charset: string;
+
+ private counter: number[];
+
+ constructor(charset: string) {
+ if (charset.length === 0) {
+ throw new TypeError('charset is empty');
+ }
+
+ this.charset = charset;
+ this.counter = [];
+ }
+
+ produce(): string {
+ this.increment();
+
+ return this.counter.map(x => this.charset[x]).join('');
+ }
+
+ private increment(): void {
+ let max = this.charset.length - 1;
+ if (this.counter.every(x => x === max)) {
+ this.counter = new Array(this.counter.length + 1).fill(0);
+ return;
+ }
+
+ this.counter.reverse();
+ let len = this.charset.length;
+ let num = this.counter.reduce((x, y, index) => x + y * len ** index) + 1;
+ for (let i = 0; i < this.counter.length; ++i) {
+ this.counter[i] = num % len;
+ num = ~~(num / len);
+ }
+ this.counter.reverse();
+ }
+}
+
--
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