新增对kw源卡拉OK歌词的支持

2022-03-14 10:02:31 +08:00
parent 1fd3e6c9fa
commit 545ba6521b
4 changed files with 140 additions and 10 deletions
@@ -76,3 +76,81 @@ export const tokenRequest = async(url, options = {}) => {
  })
  return requestObj
 }
+
+export const lrcTools = {
+  rxps: {
+    wordLine: /^(\[\d{1,2}:.*\d{1,4}\])\s*(\S+(?:\s+\S+)*)?\s*/,
+    tagLine: /\[(ver|ti|ar|al|by|kuwo):\s*(\S+(?:\s+\S+)*)\s*\]/,
+    wordTimeAll: /<(-?\d+),(-?\d+)(?:,-?\d+)?>/g,
+    wordTime: /<(-?\d+),(-?\d+)(?:,-?\d+)?>/,
+  },
+  offset: 1,
+  offset2: 1,
+  isOK: false,
+  lines: [],
+  getWordInfo(str, str2) {
+    const offset = parseInt(str)
+    const offset2 = parseInt(str2)
+    const startTime = Math.floor((offset + offset2) / (this.offset * 2))
+    const timeLength = Math.floor((offset - offset2) / (this.offset2 * 2))
+    return {
+      startTime,
+      timeLength,
+    }
+  },
+  parseLine(line) {
+    if (line.length < 6) return
+    let result = this.rxps.wordLine.exec(line)
+    if (result) {
+      const time = result[1]
+      let words = result[2]
+      if (words == null) {
+        words = ''
+      }
+      const wordTimes = words.match(this.rxps.wordTimeAll)
+      if (!wordTimes) {
+        this.isOK = false
+        return
+      }
+      // console.log(wordTimes)
+      for (const timeStr of wordTimes) {
+        const result = this.rxps.wordTime.exec(timeStr)
+        const wordInfo = this.getWordInfo(result[1], result[2])
+        words = words.replace(timeStr, `<${wordInfo.startTime},${wordInfo.timeLength}>`)
+      }
+      this.lines.push(time + words)
+      return
+    }
+    result = this.rxps.tagLine.exec(line)
+    if (!result) return
+    if (result[1] == 'kuwo') {
+      let content = result[2]
+      if (content != null && content.includes('][')) {
+        content = content.substring(0, content.indexOf(']['))
+      }
+      const valueOf = parseInt(content, 8)
+      this.offset = Math.floor(valueOf / 10)
+      this.offset2 = Math.floor(valueOf % 10)
+      if (this.offset == 0 || Number.isNaN(this.offset) || this.offset2 == 0 || Number.isNaN(this.offset2)) {
+        this.isOK = false
+      }
+    } else {
+      this.lines.push(line)
+    }
+  },
+  parse(lrc) {
+    const lines = lrc.split(/\r\n|\r|\n/)
+    const tools = Object.create(this)
+    tools.isOK = true
+    tools.offset = 1
+    tools.offset2 = 1
+    tools.lines = []
+
+    for (const line of lines) {
+      if (!tools.isOK) return ''
+      tools.parseLine(line)
+    }
+
+    return tools.lines.length ? tools.lines.join('\n') : ''
+  },
+}