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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263import MarkdownIt from "markdown-it";import type Token from "markdown-it/lib/token.mjs";import { full as emoji } from "markdown-it-emoji";
const md = new MarkdownIt({ html: true }).use(emoji);
const inlineText = (tokens: Token[]): string => tokens .map((token) => { switch (token.type) { case "text": case "code_inline": case "emoji": return token.content; case "image": return inlineText(token.children ?? []); case "softbreak": case "hardbreak": return " "; default: return ""; } }) .join("");
export const markdownToText = (source: string): string => md .parse(source, {}) .map((token) => { if (token.type === "inline") return inlineText(token.children ?? []); if (token.type === "fence" || token.type === "code_block") return token.content; return ""; }) .filter(Boolean) .join(" ") .replace(/\s+/g, " ") .trim();
// parsing a whole 256 KiB body costs about 12 ms of every page viewconst SUMMARY_SOURCE_CHARS = 4096;
const LINK_DEFINITION = /^ {0,3}\[(?!\^)[^\]\n]+\]:[ \t]*\S.*$/gm;
const withoutComments = (source: string): string => { let out = ""; let at = 0; for (;;) { const open = source.indexOf("<!--", at); const close = open < 0 ? -1 : source.indexOf("-->", open + 4); if (close < 0) return out + source.slice(at); out += source.slice(at, open); at = close + 3; }};
export const summarize = (source: string, limit = 160): string => { const visible = withoutComments(source).replace(LINK_DEFINITION, ""); const text = markdownToText(visible.slice(0, SUMMARY_SOURCE_CHARS)); return text.length > limit || visible.length > SUMMARY_SOURCE_CHARS ? `${text.slice(0, limit - 1).trimEnd()}…` : text;};