refactor(core): CORE-01 migrate utility contracts to TypeScript

packages/artplayer/src/utils/subtitle.ts

@@ -0,0 +1,102 @@
+function fixSrt(srt: string): string {
+  return srt.replace(/(\d\d:\d\d:\d\d)[,.](\d+)/g, (_match: string, $1: string, $2: string) => {
+    let ms = $2.slice(0, 3)
+    if ($2.length === 1) {
+      ms = `${$2}00`
+    }
+    if ($2.length === 2) {
+      ms = `${$2}0`
+    }
+    return `${$1},${ms}`
+  })
+}
+
+export function srtToVtt(srtText: string): string {
+  return 'WEBVTT \r\n\r\n'.concat(
+    fixSrt(srtText)
+      .replace(/\{\\([ibu])\}/g, '</$1>')
+      .replace(/\{\\([ibu])1\}/g, '<$1>')
+      .replace(/\{([ibu])\}/g, '<$1>')
+      .replace(/\{\/([ibu])\}/g, '</$1>')
+      .replace(/(\d\d:\d\d:\d\d),(\d\d\d)/g, '$1.$2')
+      .replace(/\{[\s\S]*?\}/g, '')
+      .concat('\r\n\r\n'),
+  )
+}
+
+export function vttToBlob(vttText: string): string {
+  return URL.createObjectURL(
+    new Blob([vttText], {
+      type: 'text/vtt',
+    }),
+  )
+}
+
+export function assToVtt(ass: string): string {
+  const reAss = new RegExp(
+    'Dialogue:\\s\\d,'
+    + '(\\d+:\\d\\d:\\d\\d.\\d\\d),'
+    + '(\\d+:\\d\\d:\\d\\d.\\d\\d),'
+    + '([^,]*),'
+    + '([^,]*),'
+    + '(?:[^,]*,){4}'
+    + '([\\s\\S]*)$',
+    'i',
+  )
+
+  function fixTime(time = '') {
+    return time
+      .split(/[:.]/)
+      .map((item, index, arr) => {
+        if (index === arr.length - 1) {
+          if (item.length === 1) {
+            return `.${item}00`
+          }
+
+          if (item.length === 2) {
+            return `.${item}0`
+          }
+        }
+        else if (item.length === 1) {
+          return (index === 0 ? '0' : ':0') + item
+        }
+
+        return index === 0 ? item : index === arr.length - 1 ? `.${item}` : `:${item}`
+      })
+      .join('')
+  }
+
+  return (
+    `WEBVTT`
+    + `\n`
+    + `\n${
+      ass
+        .split(/\r?\n/)
+        .map((line) => {
+          const m = line.match(reAss)
+          if (!m)
+            return null
+          const [, start = '', end = '', , , text = ''] = m
+          return {
+            start: fixTime(start.trim()),
+            end: fixTime(end.trim()),
+            text: text
+              .replace(/\{[\s\S]*?\}/g, '')
+              .replace(/(\\N)/g, '\n')
+              .trim()
+              .split(/\r?\n/)
+              .map(item => item.trim())
+              .join('\n'),
+          }
+        })
+        .filter(line => line)
+        .map((line, index) => {
+          if (line) {
+            return `${index + 1}\n` + `${line.start} --> ${line.end}` + `\n` + `${line.text}`
+          }
+          return ''
+        })
+        .filter(line => line.trim())
+        .join('\n\n')}`
+  )
+}