Move database creation into Backend

ext/bg/js/backend.js

@@ -24,6 +24,7 @@
  * AudioUriBuilder
  * BackendApiForwarder
  * ClipboardMonitor
+ * Database
  * JsonSchema
  * Mecab
  * Translator
@@ -43,7 +44,8 @@
 
 class Backend {
     constructor() {
-        this.translator = new Translator();
+        this.database = new Database();
+        this.translator = new Translator(this.database);
         this.anki = new AnkiNull();
         this.mecab = new Mecab();
         this.clipboardMonitor = new ClipboardMonitor({getClipboard: this._onApiClipboardGet.bind(this)});
@@ -107,6 +109,7 @@ class Backend {
     }
 
     async prepare() {
+        await this.database.prepare();
         await this.translator.prepare();
 
         this.optionsSchema = await requestJson(chrome.runtime.getURL('/bg/data/options-schema.json'), 'GET');

ext/bg/js/translator.js

@@ -17,7 +17,6 @@
  */
 
 /* global
- * Database
  * Deinflector
  * dictEnabledSet
  * dictTagBuildSource
@@ -34,24 +33,17 @@
  */
 
 class Translator {
-    constructor() {
-        this.database = null;
+    constructor(database) {
+        this.database = database;
         this.deinflector = null;
         this.tagCache = new Map();
     }
 
     async prepare() {
-        if (!this.database) {
-            this.database = new Database();
-            await this.database.prepare();
-        }
-
-        if (!this.deinflector) {
         const url = chrome.runtime.getURL('/bg/lang/deinflect.json');
         const reasons = await requestJson(url, 'GET');
         this.deinflector = new Deinflector(reasons);
     }
-    }
 
     async purgeDatabase() {
         this.tagCache.clear();