fork(fix): Clone AMLL 并修复 BUG

- 将AMLL Clone到本以地进行修复和优化(emm虽然这很不优雅但是暂时无时间做子模块和Fork)
- 修复在当前播放歌词行不可见的视口Seek会出现滚动偏移的问题

amll-local/packages/lyric/test/eslrc.test.ts

@@ -0,0 +1,112 @@
+import { describe, expect, it } from "vitest";
+import { parseEslrc, stringifyEslrc } from "../src/formats/eslrc";
+
+describe("eslrc", () => {
+	it("parses basic word-ended-timestamp lines", () => {
+		const lines = parseEslrc(
+			"[00:10.82]Test[00:10.97] Word[00:12.62]\n[00:12.62]Next[00:13.20] line[00:14.10]",
+		);
+
+		expect(lines).toHaveLength(2);
+		expect(lines[0].startTime).toBe(10820);
+		expect(lines[0].endTime).toBe(12620);
+		expect(lines[0].words[0].word).toBe("Test");
+		expect(lines[0].words[0].startTime).toBe(10820);
+		expect(lines[0].words[0].endTime).toBe(10970);
+		expect(lines[0].words[1].word).toBe(" Word");
+		expect(lines[0].words[1].startTime).toBe(10970);
+		expect(lines[0].words[1].endTime).toBe(12620);
+	});
+
+	it("handles CRLF and ignores malformed lines", () => {
+		const lines = parseEslrc(
+			"[00:10.82]Ok[00:11.00]\r\nno timestamp\r\n[00:12.00]Broken no end\r\n[00:12.00]AlsoBroken[invalid]\r\n[00:13.00]Fine[00:13.50]",
+		);
+
+		expect(lines).toHaveLength(2);
+		expect(lines[0].words.map((w) => w.word).join("")).toBe("Ok");
+		expect(lines[1].words.map((w) => w.word).join("")).toBe("Fine");
+	});
+
+	it("sorts parsed lines by first word timestamp", () => {
+		const lines = parseEslrc(
+			"[00:20.00]Second[00:21.00]\n[00:10.00]First[00:11.00]",
+		);
+
+		expect(lines).toHaveLength(2);
+		expect(lines[0].words.map((w) => w.word).join("")).toBe("First");
+		expect(lines[1].words.map((w) => w.word).join("")).toBe("Second");
+	});
+
+	it("clamps parsed timestamps to max lrc time", () => {
+		const lines = parseEslrc("[999:99.999]Max[1000:40.000]");
+
+		expect(lines).toHaveLength(1);
+		expect(lines[0].startTime).toBe(60039999);
+		expect(lines[0].endTime).toBe(60039999);
+		expect(lines[0].words[0].startTime).toBe(60039999);
+		expect(lines[0].words[0].endTime).toBe(60039999);
+	});
+
+	it("ignores empty lines and lines with only whitespace", () => {
+		const lines = parseEslrc(
+			"[00:01.000]   \n[00:02.000]\n[00:10.82]Test[00:10.97] Word[00:12.62]\n   \n[00:12.62]Next[00:13.20] line[00:14.10]\n   \n",
+		);
+		expect(lines).toHaveLength(2);
+		expect(lines[0].words[0].word).toBe("Test");
+		expect(lines[1].words[0].word).toBe("Next");
+	});
+
+	it("stringifies to expected eslrc text", () => {
+		const result = stringifyEslrc([
+			{
+				startTime: 0,
+				endTime: 0,
+				words: [
+					{ startTime: 10820, endTime: 10970, word: "Test", romanWord: "" },
+					{ startTime: 10970, endTime: 12620, word: " Word", romanWord: "" },
+				],
+				translatedLyric: "",
+				romanLyric: "",
+				isBG: false,
+				isDuet: false,
+			},
+		]);
+
+		expect(result).toBe("[00:10.820]Test[00:10.970] Word[00:12.620]");
+	});
+
+	it("normalizes invalid timestamps when stringifying", () => {
+		const result = stringifyEslrc([
+			{
+				startTime: 0,
+				endTime: 0,
+				words: [
+					{
+						startTime: Number.NaN,
+						endTime: Number.POSITIVE_INFINITY,
+						word: "Hello",
+						romanWord: "",
+					},
+					{ startTime: -1, endTime: -2, word: "World", romanWord: "" },
+				],
+				translatedLyric: "",
+				romanLyric: "",
+				isBG: false,
+				isDuet: false,
+			},
+		]);
+
+		expect(result).toBe("[00:00.000]Hello[00:00.000]World[00:00.000]");
+	});
+
+	it("keeps parse -> stringify -> parse stable for content and timing", () => {
+		const input =
+			"[00:10.82]Test[00:10.97] Word[00:12.62]\n[00:12.62]Next[00:13.20] line[00:14.10]";
+		const first = parseEslrc(input);
+		const text = stringifyEslrc(first);
+		const second = parseEslrc(text);
+
+		expect(second).toEqual(first);
+	});
+});