重构逐句视频播放器

src/app/(features)/srt-player/utils/subtitleParser.ts

@@ -0,0 +1,99 @@
+import { SubtitleEntry } from "../types/subtitle";
+
+export function parseSrt(data: string): SubtitleEntry[] {
+  const lines = data.split(/\r?\n/);
+  const result: SubtitleEntry[] = [];
+  const re = new RegExp(
+    "(\\d{2}:\\d{2}:\\d{2},\\d{3})\\s*-->\\s*(\\d{2}:\\d{2}:\\d{2},\\d{3})",
+  );
+  let i = 0;
+  
+  while (i < lines.length) {
+    if (!lines[i].trim()) {
+      i++;
+      continue;
+    }
+    i++;
+    if (i >= lines.length) break;
+    
+    const timeMatch = lines[i].match(re);
+    if (!timeMatch) {
+      i++;
+      continue;
+    }
+    
+    const start = toSeconds(timeMatch[1]);
+    const end = toSeconds(timeMatch[2]);
+    i++;
+    
+    let text = "";
+    while (i < lines.length && lines[i].trim()) {
+      text += lines[i] + "\n";
+      i++;
+    }
+    
+    result.push({ 
+      start, 
+      end, 
+      text: text.trim(),
+      index: result.length,
+    });
+    i++;
+  }
+  
+  return result;
+}
+
+export function getSubtitleIndex(
+  subtitles: SubtitleEntry[],
+  currentTime: number,
+): number | null {
+  for (let i = 0; i < subtitles.length; i++) {
+    if (currentTime >= subtitles[i].start && currentTime <= subtitles[i].end) {
+      return i;
+    }
+  }
+  return null;
+}
+
+export function getNearestIndex(
+  subtitles: SubtitleEntry[],
+  currentTime: number,
+): number | null {
+  for (let i = 0; i < subtitles.length; i++) {
+    const subtitle = subtitles[i];
+    const isBefore = currentTime - subtitle.start >= 0;
+    const isAfter = currentTime - subtitle.end >= 0;
+    
+    if (!isBefore || !isAfter) return i - 1;
+    if (isBefore && !isAfter) return i;
+  }
+  return null;
+}
+
+export function getCurrentSubtitle(
+  subtitles: SubtitleEntry[],
+  currentTime: number,
+): SubtitleEntry | null {
+  return subtitles.find((subtitle) => 
+    currentTime >= subtitle.start && currentTime <= subtitle.end
+  ) || null;
+}
+
+function toSeconds(timeStr: string): number {
+  const [h, m, s] = timeStr.replace(",", ".").split(":");
+  return parseFloat(
+    (parseInt(h) * 3600 + parseInt(m) * 60 + parseFloat(s)).toFixed(3),
+  );
+}
+
+export async function loadSubtitle(url: string): Promise<SubtitleEntry[]> {
+  try {
+    const response = await fetch(url);
+    const data = await response.text();
+    return parseSrt(data);
+  } catch (error) {
+    console.error('Failed to load subtitle:', error);
+    return [];
+  }
+}