Function highlightCodeBlock

src/utils/codeHighlight.js:250–295

(code, language)

 * @param {string} language - Language identifier from markdown fence (e.g., "javascript", "python")
 */
export async function highlightCodeBlock(code, language) {
	if (!code) return "";

	const themeId = settings?.value?.editorTheme || "one_dark";
	const langKey = (language || "text").toLowerCase();

	const cacheKey = `block:${themeId}:${langKey}:${code}`;
	if (highlightCache.has(cacheKey)) {
		return highlightCache.get(cacheKey);
	}

	try {
		const parser = await getParserForLanguage(langKey);
		if (parser) {
			const tree = parser.parse(code);
			let result = "";

			highlightCode(
				code,
				tree,
				classHighlighter,
				(text, classes) => {
					if (classes) {
						result += `<span class="${classes}">${escapeHtml(text)}</span>`;
					} else {
						result += escapeHtml(text);
					}
				},
				() => {
					result += "\n";
				},
			);

			if (result) {
				setCache(cacheKey, result);
				return result;
			}
		}
	} catch (e) {
		console.warn("Code block highlighting failed for", language, e);
	}

	const escaped = escapeHtml(code);
	setCache(cacheKey, escaped);
	return escaped;
}

export function clearHighlightCache() {
	highlightCache.clear();