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<script lang="ts">
import DOMPurify from "dompurify";
import hljs from "highlight.js/lib/core";
// Hot set — matches roughly what ChatGPT preloads. Registered eagerly so
// common code blocks highlight on first paint without a network roundtrip.
import bash from "highlight.js/lib/languages/bash";
import c from "highlight.js/lib/languages/c";
import cpp from "highlight.js/lib/languages/cpp";
import csharp from "highlight.js/lib/languages/csharp";
import css from "highlight.js/lib/languages/css";
import go from "highlight.js/lib/languages/go";
import java from "highlight.js/lib/languages/java";
import javascript from "highlight.js/lib/languages/javascript";
import json from "highlight.js/lib/languages/json";
import markdown from "highlight.js/lib/languages/markdown";
import php from "highlight.js/lib/languages/php";
import plaintext from "highlight.js/lib/languages/plaintext";
import python from "highlight.js/lib/languages/python";
import ruby from "highlight.js/lib/languages/ruby";
import rust from "highlight.js/lib/languages/rust";
import shell from "highlight.js/lib/languages/shell";
import sql from "highlight.js/lib/languages/sql";
import typescript from "highlight.js/lib/languages/typescript";
import xml from "highlight.js/lib/languages/xml";
import yaml from "highlight.js/lib/languages/yaml";
import { Marked } from "marked";
import { markedHighlight } from "marked-highlight";
hljs.registerLanguage("bash", bash);
hljs.registerLanguage("c", c);
hljs.registerLanguage("cpp", cpp);
hljs.registerLanguage("csharp", csharp);
hljs.registerLanguage("css", css);
hljs.registerLanguage("go", go);
hljs.registerLanguage("java", java);
hljs.registerLanguage("javascript", javascript);
hljs.registerLanguage("json", json);
hljs.registerLanguage("markdown", markdown);
hljs.registerLanguage("php", php);
hljs.registerLanguage("plaintext", plaintext);
hljs.registerLanguage("python", python);
hljs.registerLanguage("ruby", ruby);
hljs.registerLanguage("rust", rust);
hljs.registerLanguage("shell", shell);
hljs.registerLanguage("sql", sql);
hljs.registerLanguage("typescript", typescript);
hljs.registerLanguage("xml", xml);
hljs.registerLanguage("yaml", yaml);
// Normalize common aliases to their canonical highlight.js language names.
// The canonical name is what we'll attempt to dynamically import.
const ALIASES: Record<string, string> = {
js: "javascript",
jsx: "javascript",
mjs: "javascript",
cjs: "javascript",
ts: "typescript",
tsx: "typescript",
py: "python",
py3: "python",
rb: "ruby",
sh: "bash",
shell: "bash",
zsh: "bash",
yml: "yaml",
"c++": "cpp",
cxx: "cpp",
"c#": "csharp",
cs: "csharp",
htm: "xml",
html: "xml",
svg: "xml",
md: "markdown",
mdx: "markdown",
golang: "go",
rs: "rust",
kt: "kotlin",
ps1: "powershell",
};
function normalizeLang(lang: string): string {
const lower = lang.toLowerCase().trim();
return ALIASES[lower] ?? lower;
}
const loadCache = new Map<string, Promise<boolean>>();
async function ensureLanguage(lang: string): Promise<boolean> {
const name = normalizeLang(lang);
if (hljs.getLanguage(name)) return true;
if (loadCache.has(name)) return loadCache.get(name) ?? false;
const promise = (async () => {
try {
// Dynamic import for languages not in the hot set above.
// @vite-ignore: the variable `name` is intentionally dynamic;
// missing modules are caught by the try/catch below.
const mod = await import(/* @vite-ignore */ `highlight.js/lib/languages/${name}`);
hljs.registerLanguage(name, mod.default);
return true;
} catch {
return false;
}
})();
loadCache.set(name, promise);
return promise;
}
function escapeHtml(s: string): string {
return s
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """)
.replace(/'/g, "'");
}
const md = new Marked(
markedHighlight({
emptyLangClass: "hljs",
langPrefix: "hljs language-",
async: true,
async highlight(code: string, lang: string): Promise<string> {
if (!lang) return escapeHtml(code);
const name = normalizeLang(lang);
const loaded = await ensureLanguage(name);
if (!loaded) return escapeHtml(code);
try {
return hljs.highlight(code, { language: name, ignoreIllegals: true }).value;
} catch {
return escapeHtml(code);
}
},
}),
{
gfm: true,
breaks: true,
},
);
const { text = "", streaming = false }: { text?: string; streaming?: boolean } = $props();
function closeOpenDelimiters(src: string): string {
let out = src;
const fenceCount = (out.match(/^```/gm) || []).length;
if (fenceCount % 2 !== 0) out += "\n```";
const boldCount = (out.match(/\*\*/g) || []).length;
if (boldCount % 2 !== 0) out += "**";
const inlineCode = (out.match(/(?<!`)`(?!`)/g) || []).length;
if (inlineCode % 2 !== 0) out += "`";
return out;
}
let html = $state("");
let renderToken = 0;
$effect(() => {
const src = streaming ? closeOpenDelimiters(text) : text;
const myToken = ++renderToken;
(async () => {
try {
const raw = (await md.parse(src)) as string;
if (myToken === renderToken) html = DOMPurify.sanitize(raw);
} catch {
// swallow — keeps last successful render visible
}
})();
});
</script>
<div class="markdown-body">
{@html html}
</div>
|
