support chorus parsing

src/plugins/synced-lyrics/parsers/lrc.test.ts

@@ -0,0 +1,86 @@
+import { test, expect } from '@playwright/test';
+
+import { LRC } from './lrc';
+
+test('empty string', () => {
+  const lrc = LRC.parse('');
+  expect(lrc).toStrictEqual({ lines: [], tags: [] });
+});
+
+test('chorus', () => {
+  const lrc = LRC.parse(`\
+[00:12.00]Line 1 lyrics
+[00:17.20]Line 2 lyrics
+[00:21.10][00:45.10]Repeating lyrics (e.g. chorus)
+[mm:ss.xx]Last lyrics line\
+`);
+
+  expect(lrc).toStrictEqual({
+    lines: [
+      { duration: 12000, text: '', time: '0:0:0', timeInMs: 0 },
+      {
+        duration: 5020,
+        text: 'Line 1 lyrics',
+        time: '00:12:00',
+        timeInMs: 12000,
+      },
+      {
+        duration: 3990,
+        text: 'Line 2 lyrics',
+        time: '00:17:20',
+        timeInMs: 17020,
+      },
+      {
+        duration: 24000,
+        text: 'Repeating lyrics (e.g. chorus)',
+        time: '00:21:10',
+        timeInMs: 21010,
+      },
+      {
+        duration: Infinity,
+        text: 'Repeating lyrics (e.g. chorus)',
+        time: '00:45:10',
+        timeInMs: 45010,
+      },
+    ],
+    tags: [],
+  });
+});
+
+test('attributes', () => {
+  const lrc = LRC.parse(
+    `[ar:Chubby Checker oppure  Beatles, The]
+[al:Hits Of The 60's - Vol. 2 – Oldies]
+[ti:Let's Twist Again]
+[au:Written by Kal Mann / Dave Appell, 1961]
+[length: 2:23]
+
+[00:12.00]Naku Penda Piya-Naku Taka Piya-Mpenziwe
+[00:15.30]Some more lyrics ...`,
+  );
+
+  expect(lrc).toStrictEqual({
+    lines: [
+      { duration: 12000, text: '', time: '0:0:0', timeInMs: 0 },
+      {
+        duration: 3030,
+        text: 'Naku Penda Piya-Naku Taka Piya-Mpenziwe',
+        time: '00:12:00',
+        timeInMs: 12000,
+      },
+      {
+        duration: Infinity,
+        text: 'Some more lyrics ...',
+        time: '00:15:30',
+        timeInMs: 15030,
+      },
+    ],
+    tags: [
+      { tag: 'ar', value: 'Chubby Checker oppure  Beatles, The' },
+      { tag: 'al', value: "Hits Of The 60's - Vol. 2 – Oldies" },
+      { tag: 'ti', value: "Let's Twist Again" },
+      { tag: 'au', value: 'Written by Kal Mann / Dave Appell, 1961' },
+      { tag: 'length', value: '2:23' },
+    ],
+  });
+});

src/plugins/synced-lyrics/parsers/lrc.ts

@@ -17,7 +17,7 @@ interface LRC {
 
 const tagRegex = /^\[(?<tag>\w+):\s*(?<value>.+?)\s*\]$/;
 // prettier-ignore
-const lyricRegex = /^\[(?<minutes>\d+):(?<seconds>\d+)\.(?<milliseconds>\d+)\](?<text>.+)$/;
+const timestampRegex = /^\[(?<minutes>\d+):(?<seconds>\d+)\.(?<milliseconds>\d+)\]/m;
 
 export const LRC = {
   parse: (text: string): LRC => {
@@ -27,13 +27,29 @@ export const LRC = {
     };
 
     let offset = 0;
-    let previousLine: LRCLine | null = null;
 
-    for (const line of text.split('\n')) {
-      if (!line.trim().startsWith('[')) continue;
+    for (let line of text.split('\n')) {
+      line = line.trim();
+      if (!line.startsWith('[')) continue;
 
-      const lyric = line.match(lyricRegex)?.groups;
-      if (!lyric) {
+      const timestamps = [];
+      let match: Record<string, string> | undefined;
+      while ((match = line.match(timestampRegex)?.groups)) {
+        const { minutes, seconds, milliseconds } = match;
+        const timeInMs =
+          parseInt(minutes) * 60 * 1000 +
+          parseInt(seconds) * 1000 +
+          parseInt(milliseconds);
+
+        timestamps.push({
+          time: `${minutes}:${seconds}:${milliseconds}`,
+          timeInMs,
+        });
+
+        line = line.replace(timestampRegex, '');
+      }
+
+      if (!timestamps.length) {
         const tag = line.match(tagRegex)?.groups;
         if (tag) {
           if (tag.tag === 'offset') {
@@ -49,29 +65,28 @@ export const LRC = {
         continue;
       }
 
-      const { minutes, seconds, milliseconds, text } = lyric;
-      const timeInMs =
-        parseInt(minutes) * 60 * 1000 +
-        parseInt(seconds) * 1000 +
-        parseInt(milliseconds);
+      const text = line.trim();
 
-      const currentLine: LRCLine = {
-        time: `${minutes}:${seconds}:${milliseconds}`,
-        timeInMs,
-        text: text.trim(),
-        duration: Infinity,
-      };
-
-      if (previousLine) {
-        previousLine.duration = timeInMs - previousLine.timeInMs;
+      for (const { time, timeInMs } of timestamps) {
+        lrc.lines.push({
+          time,
+          timeInMs,
+          text: text,
+          duration: Infinity,
+        });
       }
-
-      previousLine = currentLine;
-      lrc.lines.push(currentLine);
     }
 
-    for (const line of lrc.lines) {
-      line.timeInMs += offset;
+    lrc.lines.sort(({ timeInMs: timeA }, { timeInMs: timeB }) => timeA - timeB);
+    for (let i = 0; i < lrc.lines.length; i++) {
+      const current = lrc.lines[i];
+      const next = lrc.lines[i + 1];
+
+      current.timeInMs += offset;
+
+      if (next) {
+        current.duration = next.timeInMs - current.timeInMs;
+      }
     }
 
     const first = lrc.lines.at(0);