3 files changed, 52 insertions, 50 deletions

diff --git a/ext/mixed/js/audio-system.js b/ext/mixed/js/audio-system.js
index ab6011d0..0933d90e 100644
--- a/ext/mixed/js/audio-system.js
+++ b/ext/mixed/js/audio-system.js
@@ -16,14 +16,11 @@
  */
 
 /* global
- * CacheMap
  * TextToSpeechAudio
- * api
  */
 
 class AudioSystem {
-    constructor(useCache) {
-        this._cache = new CacheMap(useCache ? 32 : 0);
+    constructor() {
         this._fallbackAudio = null;
     }
 
@@ -36,35 +33,6 @@ class AudioSystem {
         eventListeners.addEventListener(speechSynthesis, 'voiceschanged', onVoicesChanged, false);
     }
 
-    async createExpressionAudio(sources, expression, reading, details) {
-        const key = JSON.stringify([expression, reading]);
-
-        const cacheValue = this._cache.get(key);
-        if (typeof cacheValue !== 'undefined') {
-            return cacheValue;
-        }
-
-        for (let i = 0, ii = sources.length; i < ii; ++i) {
-            const source = sources[i];
-            const infoList = await await api.getExpressionAudioInfoList(source, expression, reading, details);
-            for (let j = 0, jj = infoList.length; j < jj; ++j) {
-                const info = infoList[j];
-                let audio;
-                try {
-                    audio = await this.createAudioFromInfo(info, source);
-                } catch (e) {
-                    continue;
-                }
-
-                const result = {audio, source, infoList, infoListIndex: j};
-                this._cache.set(key, result);
-                return result;
-            }
-        }
-
-        throw new Error('Could not create audio');
-    }
-
     getFallbackAudio() {
         if (this._fallbackAudio === null) {
             this._fallbackAudio = new Audio('/mixed/mp3/button.mp3');
@@ -94,17 +62,6 @@ class AudioSystem {
         return new TextToSpeechAudio(text, voice);
     }
 
-    async createAudioFromInfo(info, source) {
-        switch (info.type) {
-            case 'url':
-                return await this.createAudio(info.url, source);
-            case 'tts':
-                return this.createTextToSpeechAudio(info.text, info.voice);
-            default:
-                throw new Error(`Unsupported type: ${info.type}`);
-        }
-    }
-
     // Private
 
     _isAudioValid(audio, source) {
diff --git a/ext/mixed/js/display-audio.js b/ext/mixed/js/display-audio.js
index 0cd8a625..cc7e9e93 100644
--- a/ext/mixed/js/display-audio.js
+++ b/ext/mixed/js/display-audio.js
@@ -17,16 +17,19 @@
 
 /* global
  * AudioSystem
+ * CacheMap
+ * api
  */
 
 class DisplayAudio {
     constructor(display) {
         this._display = display;
         this._audioPlaying = null;
-        this._audioSystem = new AudioSystem(true);
+        this._audioSystem = new AudioSystem();
         this._autoPlayAudioTimer = null;
         this._autoPlayAudioDelay = 400;
         this._eventListeners = new EventListenerCollection();
+        this._cache = new CacheMap(32);
     }
 
     get autoPlayAudioDelay() {
@@ -118,7 +121,7 @@ class DisplayAudio {
             let info;
             try {
                 let source;
-                ({audio, source} = await this._audioSystem.createExpressionAudio(sources, expression, reading, {textToSpeechVoice, customSourceUrl}));
+                ({audio, source} = await this._createExpressionAudio(sources, expression, reading, {textToSpeechVoice, customSourceUrl}));
                 const sourceIndex = sources.indexOf(source);
                 info = `From source ${1 + sourceIndex}: ${source}`;
             } catch (e) {
@@ -182,4 +185,44 @@ class DisplayAudio {
         }
         return results;
     }
+
+    async _createExpressionAudio(sources, expression, reading, details) {
+        const key = JSON.stringify([expression, reading]);
+
+        const cacheValue = this._cache.get(key);
+        if (typeof cacheValue !== 'undefined') {
+            return cacheValue;
+        }
+
+        for (let i = 0, ii = sources.length; i < ii; ++i) {
+            const source = sources[i];
+            const infoList = await await api.getExpressionAudioInfoList(source, expression, reading, details);
+            for (let j = 0, jj = infoList.length; j < jj; ++j) {
+                const info = infoList[j];
+                let audio;
+                try {
+                    audio = await this._createAudioFromInfo(info, source);
+                } catch (e) {
+                    continue;
+                }
+
+                const result = {audio, source, infoList, infoListIndex: j};
+                this._cache.set(key, result);
+                return result;
+            }
+        }
+
+        throw new Error('Could not create audio');
+    }
+
+    async _createAudioFromInfo(info, source) {
+        switch (info.type) {
+            case 'url':
+                return await this._audioSystem.createAudio(info.url, source);
+            case 'tts':
+                return this._audioSystem.createTextToSpeechAudio(info.text, info.voice);
+            default:
+                throw new Error(`Unsupported type: ${info.type}`);
+        }
+    }
 }
diff --git a/ext/mixed/js/text-to-speech-audio.js b/ext/mixed/js/text-to-speech-audio.js
index 69244514..a32916f4 100644
--- a/ext/mixed/js/text-to-speech-audio.js
+++ b/ext/mixed/js/text-to-speech-audio.js
@@ -17,8 +17,8 @@
 
 class TextToSpeechAudio {
     constructor(text, voice) {
-        this.text = text;
-        this.voice = voice;
+        this._text = text;
+        this._voice = voice;
         this._utterance = null;
         this._volume = 1;
     }
@@ -26,6 +26,7 @@ class TextToSpeechAudio {
     get currentTime() {
         return 0;
     }
+
     set currentTime(value) {
         // NOP
     }
@@ -33,6 +34,7 @@ class TextToSpeechAudio {
     get volume() {
         return this._volume;
     }
+
     set volume(value) {
         this._volume = value;
         if (this._utterance !== null) {
@@ -43,10 +45,10 @@ class TextToSpeechAudio {
     async play() {
         try {
             if (this._utterance === null) {
-                this._utterance = new SpeechSynthesisUtterance(this.text || '');
+                this._utterance = new SpeechSynthesisUtterance(typeof this._text === 'string' ? this._text : '');
                 this._utterance.lang = 'ja-JP';
                 this._utterance.volume = this._volume;
-                this._utterance.voice = this.voice;
+                this._utterance.voice = this._voice;
             }
 
             speechSynthesis.cancel();