add: line spliter and ID Tag extractor for LRC parser

add: corresponding test for parser

src/lib/lyrics/parser.ts

@@ -0,0 +1,49 @@
+export interface ScriptItem {
+    start: number;
+    text: string;
+    end: number;
+    translation?: string;
+    words?: ScriptWordsItem[];
+    singer?: number;
+    chorus?: string;
+}
+
+export interface ScriptWordsItem {
+    start: number;
+    end: number;
+    beginIndex: number;
+    endIndex: number;
+}
+
+export interface LrcJsonData {
+    ar?: string;
+    ti?: string;
+    al?: string;
+    scripts?: ScriptItem[];
+
+    [key: string]: any;
+}
+
+interface IDTag {
+    [key: string]: string;
+}
+
+export function splitLine(str: string) {
+    return str.split('\n').filter((str) => str.trim() !== '');
+}
+
+export function ExtractIDTags(lines: string[]) {
+    let result: IDTag = {};
+    const IDTagRegex = /^\[(\w*): (.*?)]$/;
+    let lastMatch = 0;
+    for (let i = 0; i < lines.length; i++) {
+        const line = lines[i];
+        const matchResult = line.trim().match(IDTagRegex);
+        if (matchResult && matchResult.length == 3) {
+            const tagName = matchResult[1];
+            const tagValue = matchResult[2];
+            result[tagName] = tagValue;
+        }
+    }
+    return result;
+}

src/test/lrcParser.test.ts

@@ -0,0 +1,19 @@
+import { describe, expect, it } from 'vitest';
+import fs from 'fs';
+import { ExtractIDTags, splitLine } from '$lib/lyrics/parser';
+
+describe('LRC parser test', () => {
+    const test01Buffer = fs.readFileSync('./src/test/resources/test-01.lrc');
+    const test01Text = test01Buffer.toString('utf-8');
+    it('Line Split', () => {
+        const lyrics = test01Text;
+        const lines = splitLine(lyrics);
+        expect(lines[26]).toBe('[01:52.991]');
+    });
+    it('IDTag Extract', () => {
+        const lyrics = test01Text;
+        const lines = splitLine(lyrics);
+        const idTags = ExtractIDTags(lines);
+        expect(idTags['ar']).toBe('洛天依');
+    });
+});

src/test/resources/test-01.lrc

@@ -0,0 +1,56 @@
+[ti: 中华少女·终]
+[ar: 洛天依]
+[al: 中华少女]
+[tool: 歌词滚动姬 https://lrc-maker.github.io]
+[00:46.706] 我想要仗剑天涯却陷入纷乱
+[00:49.588] 因果与恩怨牵杂等谁来诊断
+[00:52.284] 暗箭在身后是否该回身看
+[00:55.073] 人心有了鬼心房便要过鬼门关
+[00:57.875] 早已茫然染了谁的血的这抹长衫
+[01:00.702] 独木桥上独目瞧的人一夫当关
+[01:03.581] 复仇或是诅咒缠在身上的宿命
+[01:06.591] 棋子在棋盘被固定移动不停转
+[01:09.241] 仇恨与仇恨周而复始往返
+[01:12.586] 酒楼深胭脂一点分隔光暗
+[01:15.205] 数求问天涯海角血债偿还
+[01:18.015] 终是神念迷茫只做旁观
+[01:21.087] 是非恩怨三生纠葛轮转
+[01:23.709] 回望从前苦笑将杯酒斟满
+[01:26.573] 那时明月今日仍旧皎洁
+[01:29.115] 只叹换拨人看
+[01:31.024] 你可是这样的少年
+[01:33.971] 梦想着穿越回从前
+[01:36.554] 弦月下着青衫抚长剑
+[01:42.341] 风起时以血绘长卷
+[01:45.276] 三寸剑只手撼江山
+[01:47.838] 拂衣去逍遥天地间
+[01:52.991]
+[02:16.707] 黄藓绿斑苔痕将岁月扒谱
+[02:20.077] 望眼欲穿你何时寄来家书
+[02:22.788] 踱步间院落飞絮聚散化作愁字
+[02:25.601] 当泪水成河能否凫上一位游子
+[02:28.050] 当庭间嫣红轻轻闻着雨声
+[02:30.841] 电闪雷鸣院中青翠摇曳倚风
+[02:33.362] 青丝落指尖模糊记忆更为清晰
+[02:36.334] 那一朵英姿遮挡于一抹旌旗飘
+[02:39.511] 厮杀与厮杀周而复始招摇
+[02:42.576] 血渍滑落于枪尖映照宵小
+[02:45.726] 城池下红莲飞溅绽放照耀
+[02:48.509] 碧落黄泉再无叨扰
+[02:51.338] 北风呼啸三生等待轮转
+[02:53.660] 山崖古道思绪被光阴晕染
+[02:56.895] 那时明月今日仍旧皎洁
+[02:59.293] 只叹孤身人看
+[03:01.335] 你可是这样的少年
+[03:04.377] 梦想着穿越回从前
+[03:06.924] 北风里铁衣冷槊光寒
+[03:12.607] 一朝去大小三百战
+[03:15.623] 岁月欺万里定江山
+[03:18.126] 再与她同游天地间
+[03:24.356] 说书人或许会留恋
+[03:27.057] 但故事毕竟有终点
+[03:29.590] 最好的惊堂木是时间
+[03:35.157] 就让我合上这书卷
+[03:38.242] 愿那些梦中的玩伴
+[03:40.857] 梦醒后仍然是少年
+[03:46.139]