forked from miao-moe/QZMusic_PC
110 lines
2.7 KiB
TypeScript
110 lines
2.7 KiB
TypeScript
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/**
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* @fileoverview ESLyric 逐词歌词格式解析与生成。
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* 每行以行首时间戳开头，后续每个单词后都跟一个结束时间戳。
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*
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* 格式示例：
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* [00:10.82]Test[00:10.97] Word[00:12.62]
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* [00:12.62]Next[00:13.20] line[00:14.10]
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*/
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import type { LyricLine, LyricWord } from "../types";
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import {
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clampTimestamp,
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createLine,
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createWord,
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formatTime,
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parseTime,
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} from "../utils";
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const TIME_REGEX = /^\[((?:\d+:)*\d+(?:\.\d+)?)\]/;
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function parseTimestampPrefix(
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src: string,
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): { time: number; length: number } | null {
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const match = src.match(TIME_REGEX);
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if (!match) return null;
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const [raw, timeStr] = match;
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return { time: parseTime(timeStr), length: raw.length };
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}
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function parseEslrcLine(rawLine: string): LyricLine | null {
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let src = rawLine.trim();
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const first = parseTimestampPrefix(src);
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if (!first) return null;
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src = src.slice(first.length);
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let startTime = first.time;
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if (!src.trim()) return null;
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const words: LyricWord[] = [];
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while (src.trim().length > 0) {
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const nextTimePos = src.indexOf("[");
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if (nextTimePos <= 0) return null;
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const word = src.slice(0, nextTimePos);
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const nextTime = parseTimestampPrefix(src.slice(nextTimePos));
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if (!nextTime) return null;
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words.push(
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createWord({
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word,
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startTime,
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endTime: nextTime.time,
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}),
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);
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src = src.slice(nextTimePos + nextTime.length);
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startTime = nextTime.time;
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}
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return createLine({ words });
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}
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/**
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* 解析 ESLyric 逐词歌词格式字符串
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* @param eslrc 歌词字符串
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* @returns 成功解析出来的歌词
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*/
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export function parseEslrc(eslrc: string): LyricLine[] {
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const result: LyricLine[] = [];
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for (const rawLine of eslrc.split(/\r?\n/)) {
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const line = parseEslrcLine(rawLine);
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if (line) result.push(line);
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}
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result.sort(
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(a, b) =>
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(a.words[0]?.startTime ?? Number.MAX_SAFE_INTEGER) -
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(b.words[0]?.startTime ?? Number.MAX_SAFE_INTEGER),
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);
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for (const line of result) {
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for (const word of line.words) {
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word.startTime = clampTimestamp(word.startTime);
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word.endTime = clampTimestamp(word.endTime);
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}
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line.startTime = clampTimestamp(line.words[0]?.startTime ?? 0);
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line.endTime = clampTimestamp(
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line.words[line.words.length - 1]?.endTime ?? 0,
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);
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}
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return result;
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}
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/**
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* 将歌词数组转换为 ESLyric 逐词歌词格式字符串
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* @param lines 歌词数组
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* @returns ESLyric 逐词歌词格式字符串
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*/
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export function stringifyEslrc(lines: LyricLine[]): string {
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return lines
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.map((line) => {
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if (!line.words.length) return "";
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return `[${formatTime(clampTimestamp(line.words[0].startTime))}]${line.words
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.map(
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(word) => `${word.word}[${formatTime(clampTimestamp(word.endTime))}]`,
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)
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.join("")}`;
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})
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.filter(Boolean)
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.join("\n");
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}
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