add pdftomd

tools/mathjax-checker/check.mjs

@@ -0,0 +1,72 @@
+import MathJax from "mathjax";
+import process from "node:process";
+
+const MAX_MESSAGE_LENGTH = 500;
+
+function errorMessage(error) {
+  const message = error && typeof error.message === "string" ? error.message : String(error);
+  return message.slice(0, MAX_MESSAGE_LENGTH);
+}
+
+function renderError(serialized) {
+  const match = serialized.match(/data-mjx-error="([^"]+)"/);
+  return match ? match[1].slice(0, MAX_MESSAGE_LENGTH) : "";
+}
+
+async function readStdin() {
+  let input = "";
+  for await (const chunk of process.stdin) {
+    input += chunk;
+  }
+  return input;
+}
+
+function parsePayload(input) {
+  const payload = JSON.parse(input || "{}");
+  if (!payload || !Array.isArray(payload.expressions)) {
+    throw new Error("Input JSON must contain an expressions array.");
+  }
+  return payload;
+}
+
+async function checkExpression(expression) {
+  const index = Number(expression.index);
+  const body = String(expression.body ?? "");
+  const display = Boolean(expression.display);
+
+  try {
+    const svg = await MathJax.tex2svgPromise(body, { display });
+    const serialized = MathJax.startup.adaptor.serializeXML(svg);
+    const message = renderError(serialized);
+    if (message) {
+      return { index, ok: false, message };
+    }
+    return { index, ok: true };
+  } catch (error) {
+    return { index, ok: false, message: errorMessage(error) };
+  }
+}
+
+async function main() {
+  await MathJax.init({
+    loader: { load: ["input/tex", "output/svg"] },
+  });
+
+  if (process.argv.includes("--health")) {
+    await MathJax.tex2svgPromise("x", { display: false });
+    process.stdout.write(`${JSON.stringify({ ok: true })}\n`);
+    return;
+  }
+
+  const payload = parsePayload(await readStdin());
+  const results = [];
+  for (const expression of payload.expressions) {
+    results.push(await checkExpression(expression));
+  }
+  process.stdout.write(`${JSON.stringify({ results })}\n`);
+}
+
+main().catch((error) => {
+  process.stderr.write(`${errorMessage(error)}\n`);
+  process.exitCode = 1;
+});