's'

lib/content/ebook.ts

@@ -0,0 +1,51 @@
+/**
+ * 电子书 Markdown 解析 - 共享模块
+ */
+import { marked } from "marked";
+
+export interface EbookChunk {
+  html: string;
+  estimatedHeight: number;
+}
+
+export interface EbookData {
+  chunks: EbookChunk[];
+  headers: string[];
+}
+
+export function parseEbookMarkdown(source: string): EbookData {
+  const html = marked.parse(source, { breaks: true, gfm: true }) as string;
+  const lazyHtml = html.replace(/<img /g, '<img loading="lazy" decoding="async" ');
+
+  let rawChunks = lazyHtml.split(/(?=<h1[\s>])/i).filter((c) => c.trim());
+  if (rawChunks.length <= 1) {
+    rawChunks = lazyHtml.split(/(?=<h2[\s>])/i).filter((c) => c.trim());
+  }
+
+  const headers: string[] = [];
+  const headerRegex = /<h1[^>]*>(.*?)<\/h1>/gi;
+  let m;
+  while ((m = headerRegex.exec(lazyHtml)) !== null) {
+    headers.push(m[1].replace(/<[^>]+>/g, ""));
+  }
+  if (headers.length === 0) {
+    const h2Regex = /<h2[^>]*>(.*?)<\/h2>/gi;
+    while ((m = h2Regex.exec(lazyHtml)) !== null) {
+      headers.push(m[1].replace(/<[^>]+>/g, ""));
+    }
+  }
+
+  const chunks: EbookChunk[] = rawChunks.map((chunkHtml) => {
+    const imgCount = (chunkHtml.match(/<img\b/g) || []).length;
+    const textLen = chunkHtml.replace(/<[^>]+>/g, "").length;
+    const estimatedHeight = Math.max(300, Math.round(textLen * 0.6 + imgCount * 350));
+    return { html: chunkHtml, estimatedHeight };
+  });
+
+  return { chunks, headers };
+}
+
+/** 估算阅读时间（字/分钟，中文约 300-500） */
+export function estimateReadingMinutes(textLength: number, wpm = 400): number {
+  return Math.max(1, Math.ceil(textLength / wpm));
+}