Preloading audio for Edge TTS and other fixes (#138)

* Blacklist some low-quality web tts voices

* Dropdown layout tweaks

* Handle no audio data received in Edge TTS

* Preloading audio for Edge TTS

apps/readest-app/src/utils/lru.ts

@@ -0,0 +1,54 @@
+export class LRUCache<K, V> {
+  private capacity: number;
+  private map: Map<K, V>;
+
+  constructor(capacity: number) {
+    if (capacity <= 0) {
+      throw new Error('LRUCache capacity must be greater than 0');
+    }
+    this.capacity = capacity;
+    this.map = new Map();
+  }
+
+  get(key: K): V | undefined {
+    if (!this.map.has(key)) {
+      return undefined;
+    }
+    const value = this.map.get(key)!;
+    this.map.delete(key);
+    this.map.set(key, value);
+    return value;
+  }
+
+  set(key: K, value: V): void {
+    if (this.map.has(key)) {
+      this.map.delete(key);
+    } else if (this.map.size === this.capacity) {
+      const oldestKey = this.map.keys().next().value;
+      if (oldestKey) {
+        this.map.delete(oldestKey);
+      }
+    }
+    this.map.set(key, value);
+  }
+
+  has(key: K): boolean {
+    return this.map.has(key);
+  }
+
+  delete(key: K): boolean {
+    return this.map.delete(key);
+  }
+
+  clear(): void {
+    this.map.clear();
+  }
+
+  size(): number {
+    return this.map.size;
+  }
+
+  entries(): Array<[K, V]> {
+    return Array.from(this.map).reverse();
+  }
+}

apps/readest-app/src/utils/ssml.ts

@@ -20,7 +20,12 @@ export const parseSSMLMarks = (ssml: string) => {
       markTagEndIndex,
       nextMarkIndex !== -1 ? nextMarkIndex : ssml.length,
     );
-    const cleanedChunk = nextChunk.replace(/<[^>]+>/g, '').trimStart();
+    const cleanedChunk = nextChunk
+      .replace(/<[^>]+>/g, '')
+      .replace(/\r\n/g, '  ')
+      .replace(/\r/g, ' ')
+      .replace(/\n/g, ' ')
+      .trimStart();
     plainText += cleanedChunk;
 
     const offset = plainText.length - cleanedChunk.length;