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src/lyric/nrc.ts

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+import { IKaraokeWord, ILyric, ILyricLine, LyricType } from './declare'
+import { genLyricTag, parseLyricTag } from './common'
+
+/**
+ * 解析nrc歌词
+ * @param nrcxText nrc歌词文本内容
+ */
+export function parse(nrcxText: string) {
+	//结果
+	const result: ILyric = { type: LyricType.KARA, content: [] }
+
+	//逐行处理
+	nrcxText.split(/\r?\n/).forEach(line => {
+		line = line.trim()
+		const match = line.match(/^\[(\d+),(\d+)\]/)
+		if (match) {
+			const lyricLine: ILyricLine<IKaraokeWord[]> = {
+				start: parseInt(match[1]),
+				duration: parseInt(match[2]),
+				content: [],
+			}
+			line = line.substring(match[0].length)
+			while (line.length) {
+				const match = line.match(/^\((\d+),(\d+)(,(\d+))?\)([^\(]+)/)
+				if (!match) break
+				const start = parseInt(match[1])
+				const dur = parseInt(match[2])
+				const txt = match[5]
+				lyricLine.content.push({
+					start: start - lyricLine.start,
+					duration: dur,
+					content: txt,
+				})
+				line = line.substring(match[0].length)
+			}
+			if (lyricLine.content.length) result.content.push(lyricLine)
+		}
+		else parseLyricTag(result, line)
+	})
+
+	return result
+}
+
+/**
+ * 将nrc歌词转换为文本
+ * 
+ * @param lyric 歌词(只能是卡拉OK歌词)
+ */
+export function stringify(lyric: ILyric) {
+	if (lyric.type != LyricType.KARA) throw new Error(`lrc cannot stringify to nrc`)
+
+	const buffer: string[] = [...genLyricTag(lyric)]
+
+
+	lyric.content.forEach(line => {
+		if (typeof line.content === 'string') return
+
+		const text = line.content.map(word => {
+			return `(${word.start + line.start},${word.duration},${0})${word.content}`
+		}).join('')
+		buffer.push(`[${line.start},${line.duration}]${text}`)
+	})
+
+	return buffer.join('\n')
+}