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