forked from miao-moe/QZMusic_PC
141 lines
4.0 KiB
TypeScript
141 lines
4.0 KiB
TypeScript
/**
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* @fileoverview YRC（网易云音乐逐词歌词）格式解析与生成。
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* 行开头为 [startTime,duration]，每个词为 (startTime,duration,0)word
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*
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* 格式示例：
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* [190871,1984](190871,361,0)For (191232,172,0)the (191404,376,0)first (191780,1075,0)time
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* [193459,4198](193459,412,0)What's (193871,574,0)past (194445,506,0)is (194951,2706,0)past
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*/
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import type { LyricLine, LyricWord } from "../types";
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import {
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createLine,
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createWord,
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normalizeDuration,
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normalizeTimestamp,
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} from "../utils";
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const beginParenPattern = /^[（(]/;
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const endParenPattern = /[）)]$/;
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function checkIsBG(words: LyricWord[]): boolean {
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return (
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words.length > 0 &&
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beginParenPattern.test(words[0].word) &&
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endParenPattern.test(words[words.length - 1].word)
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);
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}
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function trimBGParentheses(words: LyricWord[]): void {
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words[0].word = words[0].word.slice(1);
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words[words.length - 1].word = words[words.length - 1].word.slice(0, -1);
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}
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/**
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* 解析 YRC 格式的歌词字符串
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* @param yrc 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 parseYrc(yrc: string): LyricLine[] {
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const wordPattern = /^(.*?)\((\d+),(\d+),0\)/;
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const linePattern = /^\[(\d+),(\d+)\]/;
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const lines = yrc
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.split(/\r?\n/)
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.map((l) => l.trim())
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.filter((l) => l.length > 0);
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return lines
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.map((lineStr) => {
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const lineMatch = lineStr.match(linePattern);
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if (!lineMatch) return null;
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const [linePrefix, lineStartStr, lineDurStr] = lineMatch;
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const lineStart = Number(lineStartStr);
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const lineDuration = Number(lineDurStr);
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const words: LyricWord[] = [];
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let lineContent = lineStr.slice(linePrefix.length).trim();
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if (!lineContent) return null;
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let lastStart = -1;
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let lastEnd = -1;
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while (true) {
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const wordMatch = lineContent.match(wordPattern);
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if (!wordMatch) break;
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const [fullMatch, lastText, wordStartStr, wordDurStr] = wordMatch;
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if (lastText && lastStart !== -1)
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words.push(
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createWord({
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word: lastText,
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startTime: lastStart,
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endTime: lastEnd,
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}),
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);
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const wordStart = Number(wordStartStr);
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const wordDur = Number(wordDurStr);
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const wordEnd = wordStart + wordDur;
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[lastStart, lastEnd] = [wordStart, wordEnd];
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lineContent = lineContent.slice(fullMatch.length);
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}
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if (lastStart !== -1 && lineContent)
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words.push(
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createWord({
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word: lineContent,
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startTime: lastStart,
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endTime: lastEnd,
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}),
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);
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const isBG = checkIsBG(words);
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if (isBG) trimBGParentheses(words);
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return createLine({
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startTime: lineStart,
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endTime: lineStart + lineDuration,
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words,
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isBG,
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});
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})
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.filter((line): line is LyricLine => line !== null);
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}
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function makeParenthesesFull(text: string): string {
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return text.replace(/\(/g, "（").replace(/\)/g, "）");
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}
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/**
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* 将歌词数组转换为 YRC 格式的字符串
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* @param lines 歌词数组
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* @returns YRC 格式的字符串
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*/
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export function stringifyYrc(lines: LyricLine[]): string {
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return lines
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.map((line) => {
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const lineStart = normalizeTimestamp(line.startTime);
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const lineEnd = normalizeTimestamp(line.endTime);
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const lineDuration = normalizeDuration(lineEnd - lineStart);
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const lineWords: string[] = [];
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for (const [
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index,
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{ word, startTime, endTime },
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] of line.words.entries()) {
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if (!word.trim() && lineWords.length) {
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lineWords[lineWords.length - 1] += word;
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continue;
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}
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let printedWord = makeParenthesesFull(word);
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if (line.isBG) {
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if (index === 0) printedWord = `（${printedWord}`;
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if (index === line.words.length - 1) printedWord += "）";
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}
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const normalizedWordStart = normalizeTimestamp(startTime);
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const normalizedWordEnd = normalizeTimestamp(endTime);
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const wordDuration = normalizeDuration(
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normalizedWordEnd - normalizedWordStart,
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);
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lineWords.push(
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`(${normalizedWordStart},${wordDuration},0)${printedWord}`,
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);
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}
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return `[${lineStart},${lineDuration}]${lineWords.join("")}`;
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})
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.join("\n");
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}
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