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fix(trending): decode HTML entities in scraped repo descriptions #408

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fix(trending): decode HTML entities in scraped repo descriptions #408

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2250893
fix(trending): decode HTML entities in scraped repo descriptions
nankingjing Jul 11, 2026
7e02c39
fix(trending): preserve invalid numeric entities
nankingjing Jul 14, 2026
afc47e7
fix(trending): preserve invalid numeric entities
nankingjing Jul 14, 2026
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42 changes: 40 additions & 2 deletions src/trending.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,40 @@ const SEARCH_QUERIES = [
{ q: "topic:machine-learning", label: "ml" },
];

// ---------------------------------------------------------------------------
// HTML entity decoding
// ---------------------------------------------------------------------------

const NAMED_ENTITIES: Record<string, string> = {
amp: "&",
lt: "<",
gt: ">",
quot: '"',
apos: "'",
nbsp: " ",
};

/**
* Decode the HTML entities that survive tag stripping on scraped github.com
* trending descriptions (e.g. `&amp;`, `&#39;`, `&lt;`). Handles named,
* decimal (`&#NN;`) and hex (`&#xNN;`) references in a single pass so
* already-decoded text and unknown entities are left untouched.
*/
function decodeHtmlEntities(text: string): string {
return text.replace(/&(#x?[0-9a-fA-F]+|[a-zA-Z]+);/g, (match, entity: string) => {
if (entity[0] === "#") {
const codePoint =
entity[1] === "x" || entity[1] === "X"
? parseInt(entity.slice(2), 16)
: parseInt(entity.slice(1), 10);
return Number.isNaN(codePoint) || codePoint > 0x10ffff
? match
: String.fromCodePoint(codePoint);
}
return NAMED_ENTITIES[entity.toLowerCase()] ?? match;
});
}

// ---------------------------------------------------------------------------
// GitHub Trending HTML fetch
// ---------------------------------------------------------------------------
Expand Down Expand Up @@ -79,11 +113,15 @@ async function fetchGitHubTrending(): Promise<{ repos: TrendingRepo[]; success:

// description from col-9 paragraph
const descMatch = block.match(/<p[^>]*class="[^"]*col-9[^"]*"[^>]*>([\s\S]*?)<\/p>/);
const description = descMatch?.[1] ? descMatch[1].replace(/<[^>]+>/g, "").trim() : "";
const description = descMatch?.[1]
? decodeHtmlEntities(descMatch[1].replace(/<[^>]+>/g, "").trim())
: "";

// language
const langMatch = block.match(/<span[^>]+itemprop="programmingLanguage"[^>]*>([\s\S]*?)<\/span>/);
const language = langMatch?.[1] ? langMatch[1].replace(/<[^>]+>/g, "").trim() : "";
const language = langMatch?.[1]
? decodeHtmlEntities(langMatch[1].replace(/<[^>]+>/g, "").trim())
: "";

// today stars
const todayMatch = block.match(/([\d,]+)\s+stars?\s+today/i);
Expand Down