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