507 lines
14 KiB
TypeScript
507 lines
14 KiB
TypeScript
import { cloneDeep } from 'lodash-es'
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import type { LyricLine } from '@applemusic-like-lyrics/lyric'
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import { parseTTML as parseTTMLLib } from '@applemusic-like-lyrics/lyric'
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import { extractLyricContent } from './qrc-parser'
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import { parseLrc } from './parseLrc'
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/**
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* LRC 格式类型
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*/
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export enum LrcFormat {
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/** 普通逐行 LRC */
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Line = 'line',
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/** 逐字 LRC：[00:28.850]曲[00:32.455]：[00:36.060]钱 */
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WordByWord = 'word-by-word',
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/** 增强型 LRC (ESLyric)：[01:37.305]<01:37.624>怕<01:37.943>你 */
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Enhanced = 'enhanced'
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}
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/** LyricWord 类型 */
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type LyricWord = { word: string; startTime: number; endTime: number; romanWord: string }
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// 预编译正则表达式
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const META_TAG_REGEX = /^\[[a-z]+:/i
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const TIME_TAG_REGEX = /\[(\d{2}):(\d{2})\.(\d{1,})\]/g
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const ENHANCED_TIME_TAG_REGEX = /<(\d{2}):(\d{2})\.(\d{1,})>/
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// 移除全局带状态的正则，改为在函数内使用 matchAll 或重新构建
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const LINE_TIME_REGEX = /^\[(\d{2}):(\d{2})\.(\d{1,})\]/
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// QRC 解析相关正则 - 提前编译
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const QRC_LINE_PATTERN = /^\[(\d+),(\d+)\](.*)$/
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const QRC_WORD_PATTERN = /([^(]*)\((\d+),(\d+)\)/g
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const DEFAULT_WORD_DURATION = 1000
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const ALIGN_TOLERANCE_MS = 300
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/**
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* 解析时间戳为毫秒
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* 使用字符串补齐处理，避免浮点数计算误差
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*/
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const parseTimeToMs = (min: string, sec: string, ms: string): number => {
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const minutes = parseInt(min, 10)
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const seconds = parseInt(sec, 10)
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// 补齐到 3 位 (例如 "5" -> "500", "05" -> "050", "1234" -> "123")
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const msNormalized = ms.padEnd(3, '0').slice(0, 3)
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const milliseconds = parseInt(msNormalized, 10)
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return minutes * 60 * 1000 + seconds * 1000 + milliseconds
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}
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/**
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* 创建 LyricWord 对象
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*/
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const createWord = (word: string, startTime: number, endTime: number = startTime): LyricWord => ({
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word,
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startTime,
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endTime,
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romanWord: ''
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})
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/**
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* 创建 LyricLine 对象
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*/
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const createLine = (words: LyricWord[], startTime: number, endTime: number = 0): LyricLine => ({
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words,
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startTime,
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endTime,
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translatedLyric: '',
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romanLyric: '',
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isBG: false,
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isDuet: false
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})
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/**
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* 检测 LRC 格式类型
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*/
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export const detectLrcFormat = (content: string): LrcFormat => {
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const lines = content.split(/\r?\n/)
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for (const rawLine of lines) {
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const line = rawLine.trim()
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if (!line || META_TAG_REGEX.test(line)) continue
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// 检查增强型LRC
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if (ENHANCED_TIME_TAG_REGEX.test(line)) {
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return LrcFormat.Enhanced
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}
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// 检查逐字LRC
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const matches = line.match(TIME_TAG_REGEX)
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if (matches && matches.length > 1) {
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return LrcFormat.WordByWord
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}
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}
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return LrcFormat.Line
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}
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/**
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* 解析逐字 LRC 格式
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* 优化：在解析过程中直接计算 endTime，避免二次遍历
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*/
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export const parseWordByWordLrc = (content: string): LyricLine[] => {
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const result: LyricLine[] = []
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let prevLine: LyricLine | null = null
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const WORD_BY_WORD_PATTERN = /\[(\d{2}):(\d{2})\.(\d{1,})\]([^[\\]]*)/g
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for (const rawLine of content.split(/\r?\n/)) {
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const line = rawLine.trim()
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if (!line || META_TAG_REGEX.test(line)) continue
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const words: LyricWord[] = []
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let lineStartTime = Infinity
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let prevWord: LyricWord | null = null
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const matches = line.matchAll(WORD_BY_WORD_PATTERN)
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for (const match of matches) {
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const startTime = parseTimeToMs(match[1], match[2], match[3])
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const wordText = match[4]
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if (!wordText && words.length === 0) continue
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lineStartTime = Math.min(lineStartTime, startTime)
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// 设置上一个字的结束时间
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if (prevWord) {
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prevWord.endTime = startTime
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}
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if (wordText) {
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const newWord = createWord(wordText, startTime)
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words.push(newWord)
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prevWord = newWord
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}
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}
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// 处理行内最后一个字
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if (prevWord) {
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prevWord.endTime = prevWord.startTime + DEFAULT_WORD_DURATION
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}
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if (words.length > 0) {
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const lineObj = createLine(words, lineStartTime === Infinity ? 0 : lineStartTime)
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// 设置行结束时间为最后一个字的结束时间
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lineObj.endTime = words[words.length - 1].endTime
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// 修正上一行的结束时间 (Single Pass)
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if (prevLine) {
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const prevLastWord = prevLine.words[prevLine.words.length - 1]
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// 只有当当前行开始时间晚于上一行最后一个字的开始时间时，才进行截断
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if (lineObj.startTime > prevLastWord.startTime) {
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prevLastWord.endTime = Math.min(prevLastWord.endTime, lineObj.startTime)
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prevLine.endTime = prevLastWord.endTime
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}
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}
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result.push(lineObj)
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prevLine = lineObj
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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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* 解析增强型 LRC 格式 (ESLyric)
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*/
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export const parseEnhancedLrc = (content: string): LyricLine[] => {
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const result: LyricLine[] = []
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let prevLine: LyricLine | null = null
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const ENHANCED_WORD_PATTERN = /<(\d{2}):(\d{2})\.(\d{1,})>([^<]*)/g
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for (const rawLine of content.split(/\r?\n/)) {
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const line = rawLine.trim()
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if (!line || META_TAG_REGEX.test(line)) continue
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const lineTimeMatch = LINE_TIME_REGEX.exec(line)
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if (!lineTimeMatch) continue
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const lineStartTime = parseTimeToMs(lineTimeMatch[1], lineTimeMatch[2], lineTimeMatch[3])
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const contentAfterTime = line.slice(lineTimeMatch[0].length)
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const words: LyricWord[] = []
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// 检查是否有增强型标记
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if (ENHANCED_TIME_TAG_REGEX.test(contentAfterTime)) {
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let prevWord: LyricWord | null = null
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const matches = contentAfterTime.matchAll(ENHANCED_WORD_PATTERN)
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for (const match of matches) {
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const startTime = parseTimeToMs(match[1], match[2], match[3])
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const wordText = match[4]
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if (prevWord) {
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prevWord.endTime = startTime
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}
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if (wordText) {
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const newWord = createWord(wordText, startTime)
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words.push(newWord)
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prevWord = newWord
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}
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}
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if (prevWord) {
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prevWord.endTime = prevWord.startTime + DEFAULT_WORD_DURATION // 默认兜底
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}
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} else {
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// 无增强型标记，作为整行处理
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const text = contentAfterTime.trim()
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if (text) {
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words.push(createWord(text, lineStartTime, lineStartTime + DEFAULT_WORD_DURATION)) // 默认持续1s
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}
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}
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if (words.length > 0) {
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const lineObj = createLine(words, lineStartTime)
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lineObj.endTime = words[words.length - 1].endTime
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// 修正上一行的结束时间 (Single Pass)
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if (prevLine) {
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const prevLastWord = prevLine.words[prevLine.words.length - 1]
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if (lineObj.startTime > prevLastWord.startTime) {
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prevLastWord.endTime = Math.min(prevLastWord.endTime, lineObj.startTime)
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prevLine.endTime = prevLastWord.endTime
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}
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}
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result.push(lineObj)
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prevLine = lineObj
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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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* 智能解析 LRC 歌词
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*/
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export const parseSmartLrc = (content: string): { format: LrcFormat; lines: LyricLine[] } => {
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const format = detectLrcFormat(content)
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let lines: LyricLine[]
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switch (format) {
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case LrcFormat.WordByWord:
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lines = parseWordByWordLrc(content)
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break
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case LrcFormat.Enhanced:
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lines = parseEnhancedLrc(content)
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break
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default:
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lines = parseLrc(content) || []
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}
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console.log(`[LyricParser] 检测到歌词格式: ${format}, 共 ${lines.length} 行`)
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return { format, lines }
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}
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/**
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* 判断解析结果是否为逐字格式
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*/
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export const isWordLevelFormat = (format: LrcFormat): boolean =>
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format === LrcFormat.WordByWord || format === LrcFormat.Enhanced
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/**
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* 歌词内容对齐
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* 使用双指针算法实现 O(N) 复杂度
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* @param lyrics 歌词数据 (Readonly)
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* @param otherLyrics 其他歌词数据
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* @param key 对齐类型
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* @returns 对齐后的歌词数据 (新副本)
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*/
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export const alignLyrics = (
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lyrics: Readonly<LyricLine[]>,
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otherLyrics: Readonly<LyricLine[]>,
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key: 'translatedLyric' | 'romanLyric'
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): LyricLine[] => {
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if (!lyrics.length || !otherLyrics.length) return cloneDeep(lyrics) as LyricLine[]
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const result = cloneDeep(lyrics) as LyricLine[]
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let i = 0
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let j = 0
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while (i < result.length && j < otherLyrics.length) {
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const line = result[i]
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const other = otherLyrics[j]
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const diff = line.startTime - other.startTime
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if (Math.abs(diff) <= ALIGN_TOLERANCE_MS) {
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// 匹配成功
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line[key] = other.words.map((word) => word.word).join('')
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i++
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j++
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} else if (diff < 0) {
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// 当前歌词时间较早，移动当前指针
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i++
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} else {
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// 目标歌词时间较早，移动目标指针
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j++
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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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* 解析 QRC 内容为行数据
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*/
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const parseQRCContent = (
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rawContent: string
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): Array<{
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startTime: number
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endTime: number
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words: Array<{ word: string; startTime: number; endTime: number }>
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}> => {
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// 使用策略模式提取 LyricContent (自动适配 Browser/Node 环境)
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const content = extractLyricContent(rawContent) || rawContent
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const result: Array<{
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startTime: number
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endTime: number
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words: Array<{ word: string; startTime: number; endTime: number }>
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}> = []
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for (const rawLine of content.split('\n')) {
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const line = rawLine.trim()
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if (!line) continue
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// 跳过元数据标签 [ti:xxx] [ar:xxx] 等
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if (META_TAG_REGEX.test(line)) continue
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const lineMatch = QRC_LINE_PATTERN.exec(line)
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if (!lineMatch) continue
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const lineStart = parseInt(lineMatch[1], 10)
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const lineDuration = parseInt(lineMatch[2], 10)
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const lineContent = lineMatch[3]
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// 解析逐字
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const words: Array<{ word: string; startTime: number; endTime: number }> = []
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const matches = lineContent.matchAll(QRC_WORD_PATTERN)
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for (const match of matches) {
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const wordText = match[1]
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const wordStart = parseInt(match[2], 10)
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const wordDuration = parseInt(match[3], 10)
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if (wordText) {
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words.push({
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word: wordText,
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startTime: wordStart,
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endTime: wordStart + wordDuration
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})
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}
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}
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if (words.length > 0) {
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result.push({
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startTime: lineStart,
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endTime: lineStart + lineDuration,
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words
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})
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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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* 解析 QQ 音乐 QRC 格式歌词
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* @param qrcContent QRC 原始内容
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* @param trans 翻译歌词
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* @param roma 罗马音歌词（QRC 格式）
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* @returns LyricLine 数组
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*/
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export const parseQRCLyric = (qrcContent: string, trans?: string, roma?: string): LyricLine[] => {
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// 解析主歌词
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const qrcLines = parseQRCContent(qrcContent)
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let result: LyricLine[] = qrcLines.map((qrcLine) => {
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return {
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words: qrcLine.words.map((word) => ({
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...word,
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romanWord: ''
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})),
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startTime: qrcLine.startTime,
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endTime: qrcLine.endTime,
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translatedLyric: '',
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romanLyric: '',
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isBG: false,
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isDuet: false
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}
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})
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// 处理翻译
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if (trans) {
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let transLines = parseLrc(trans)
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if (transLines?.length) {
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// 过滤包含 "//" 或 "作品的著作权" 的翻译行
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transLines = transLines.filter((line) => {
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const text = line.words.map((w) => w.word).join('')
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return !text.includes('//') && !text.includes('作品的著作权')
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})
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result = alignLyrics(result, transLines, 'translatedLyric')
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}
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}
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// 处理音译
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if (roma) {
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const qrcRomaLines = parseQRCContent(roma)
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if (qrcRomaLines?.length) {
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const romaLines: LyricLine[] = qrcRomaLines.map((line) => {
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return {
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words: [
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{
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startTime: line.startTime,
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endTime: line.endTime,
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word: line.words.map((w) => w.word).join(''),
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romanWord: ''
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}
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],
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startTime: line.startTime,
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endTime: line.endTime,
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translatedLyric: '',
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romanLyric: '',
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isBG: false,
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isDuet: false
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}
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})
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result = alignLyrics(result, romaLines, 'romanLyric')
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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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* 清洗 TTML 中不需要的翻译
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* @param ttmlContent 原始 TTML 内容
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* @returns 清洗后的 TTML 内容
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*/
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export const cleanTTMLTranslations = (ttmlContent: string): string => {
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const lang_counter = (ttml_text: string) => {
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// 使用正则匹配所有 xml:lang="xx-XX" 格式的字符串
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const langRegex = /(?<=<(span|translation)[^<>]+)xml:lang="([^"]+)"/g
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const matches = ttml_text.matchAll(langRegex)
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// 提取匹配结果并去重
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const langSet = new Set<string>()
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for (const match of matches) {
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if (match[2]) langSet.add(match[2])
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}
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return Array.from(langSet)
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}
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const lang_filter = (langs: string[]): string | null => {
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if (langs.length <= 1) return null
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const lang_matcher = (target: string) => {
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return langs.find((lang) => {
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try {
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// @ts-expect-error Intl.Locale type definition is missing maximize method
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return new Intl.Locale(lang).maximize().script === target
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} catch {
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return false
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}
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})
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}
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const hans_matched = lang_matcher('Hans')
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if (hans_matched) return hans_matched
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const hant_matched = lang_matcher('Hant')
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if (hant_matched) return hant_matched
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const major = langs.find((key) => key.startsWith('zh'))
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if (major) return major
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return langs[0]
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}
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const ttml_cleaner = (ttml_text: string, major_lang: string | null): string => {
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// 如果没有指定主语言，直接返回原文本（或者根据需求返回空）
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if (major_lang === null) return ttml_text
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/**
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* 替换逻辑回调函数
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* @param match 完整匹配到的标签字符串
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* @param lang 正则中第一个捕获组匹配到的语言代码
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*/
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const replacer = (match: string, lang: string) => (lang === major_lang ? match : '')
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const translationRegex = /<translation[^>]+xml:lang="([^"]+)"[^>]*>[\s\S]*?<\/translation>/g
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const spanRegex = /<span[^>]+xml:lang="([^" ]+)"[^>]*>[\s\S]*?<\/span>/g
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return ttml_text.replace(translationRegex, replacer).replace(spanRegex, replacer)
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}
|
||
|
||
const context_lang = lang_counter(ttmlContent)
|
||
const major = lang_filter(context_lang)
|
||
const cleaned_ttml = ttml_cleaner(ttmlContent, major)
|
||
|
||
return cleaned_ttml.replace(/\n\s*/g, '')
|
||
}
|
||
|
||
/**
|
||
* 简单的 TTML 解析器 (Wrapper for library)
|
||
*/
|
||
export const parseTTML = (content: string) => {
|
||
return parseTTMLLib(content)
|
||
}
|