hyrious/marshal-repl.ts

## marshal-repl.ts
import os from "node:os";
import fs from "node:fs";
import path from "node:path";
import cp from "node:child_process";

/**
 * ```js
 * rb_eval(`p 1`) => '1'
 * ```
 */
export async function rb_eval(code: string) {
  const file = path.join(os.tmpdir(), `${Math.random().toString(36).slice(2)}.rb`);
  await fs.promises.writeFile(file, code);
  const output = await new Promise<string>((resolve, reject) =>
    cp.exec(`ruby ${JSON.stringify(file)}`, (err, stdout, stderr) => {
      err ? reject(err) : stderr ? reject(new Error(stderr)) : resolve(stdout);
    })
  );
  await fs.promises.unlink(file);
  return output;
}

/**
 * ```js
 * rb_dump(`nil`) => Uint8Array { 4, 8, 0x30 }
 * ```
 */
export async function rb_dump(code: string): Promise<Uint8Array> {
  const hex = await rb_eval(`s = Marshal.dump begin ${code} end; print s.unpack1 'H*'`);
  return Buffer.from(hex, "hex");
}

import http, { IncomingMessage, ServerResponse } from "node:http";

http
  .createServer((req, res) => {
    res.setHeader("Access-Control-Allow-Origin", "*");

    if (req.method === "GET") {
      if (req.url === "/") return writeIndexHTML(res);
      else {
        res.statusCode = 404;
        return res.end();
      }
    }

    if (req.method === "POST") {
      if (req.url === "/rb_dump") {
        return text(req)
          .then(rb_dump)
          .then(data => {
            res.writeHead(200, { "Content-Type": "application/json" });
            res.end(JSON.stringify(data)); // {"type":"Buffer","data":[1]}
          })
          .catch(err => {
            res.writeHead(400, { "Content-Type": "text/plain" });
            res.end(err.message);
          });
      }
    }
  })
  .listen(3000, () => {
    console.log("serving http://localhost:3000");
  });

async function text(req: IncomingMessage): Promise<string> {
  const chunks: Uint8Array[] = [];
  for await (const chunk of req) chunks.push(chunk);
  return Buffer.concat(chunks).toString("utf-8");
}

function writeIndexHTML(res: ServerResponse) {
  res.writeHead(200, { "Content-Type": "text/html" });
  res.end(indexHTML);
}

const indexHTML = `<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><title>Test</title></head><body><style>
  html { height: 100%; box-sizing: border-box }
  *, *:before, *:after { box-sizing: inherit }
  body { height: 100%; margin: 0; padding: 8px }
  body { display: flex; flex-direction: column; gap: 8px }
  textarea { flex: 1; tab-size: 2; font-size: 16px; padding: 8px; line-height: 1.2; white-space: pre }
  button { padding: 8px 16px; font-size: 16px }
  .row { display: flex; gap: 8px } .row>* { flex: 1 }
  input { font-size: 16px; padding: 8px; font-family: monospace }
</style>
<textarea id="ruby" placeholder="nil">nil</textarea><button id="dump">DUMP</button>
<textarea id="output" placeholder="04 08 30"></textarea>
<textarea id="output2" placeholder="04 08 T_NIL"></textarea>
<div class="row"><input id="char" placeholder="a"><input id="char_code" placeholder="97"></div>
<script type="module">
  var IDX=256, HEX=[]
  while (IDX--) HEX[IDX] = (IDX + 256).toString(16).slice(1)
  var CODES = {45:"B_NEGATIVE",43:"B_POSITIVE",1:"RE_IGNORECASE",4:"RE_MULTILINE",91:"T_ARRAY",108:"T_BIGNUM",99:"T_CLASS",100:"T_DATA",101:"T_EXTENDED",70:"T_FALSE",105:"T_FIXNUM",102:"T_FLOAT",123:"T_HASH",125:"T_HASH_DEF",73:"T_IVAR",64:"T_LINK",109:"T_MODULE",77:"T_MODULE_OLD",48:"T_NIL",111:"T_OBJECT",47:"T_REGEXP",34:"T_STRING",83:"T_STRUCT",58:"T_SYMBOL",59:"T_SYMLINK",84:"T_TRUE",67:"T_UCLASS",117:"T_USERDEF",85:"T_USERMARSHAL"}
  dump.onclick = async () => {
    sessionStorage.setItem('ruby', ruby.value)

    output.disabled = output2.disabled = true

    const res = await fetch('/rb_dump', { method: 'POST', body: ruby.value })
    if (!res.ok) {
      output.value = await res.text()
      output2.value = ''
      output.disabled = output2.disabled = false
      return
    }

    const {data} = await res.json()
    let formatted = '', formatted2 = ''
    for (let i = 0; i < data.length; ++i) {
      formatted += HEX[data[i]] + ' '
      formatted2 += ((i > 1 ? CODES[data[i]] : '') || HEX[data[i]]) + ' '
      if (i % 16 === 15) formatted += '\\n'
    }
    output.value = formatted
    output2.value = formatted2

    output.disabled = output2.disabled = false
  }
  if (sessionStorage.getItem('ruby')) {
    ruby.value = sessionStorage.getItem('ruby')
  }
  char.oninput = () => {
    char_code.value = char.value.charCodeAt(0)
  }
  char_code.oninput = () => {
    char.value = String.fromCharCode(char_code.value)
  }
</script></body></html>
`;
	import os from "node:os";
	import fs from "node:fs";
	import path from "node:path";
	import cp from "node:child_process";

	/**
	* ```js
	* rb_eval(`p 1`) => '1'
	* ```
	*/
	export async function rb_eval(code: string) {
	const file = path.join(os.tmpdir(), `${Math.random().toString(36).slice(2)}.rb`);
	await fs.promises.writeFile(file, code);
	const output = await new Promise<string>((resolve, reject) =>
	cp.exec(`ruby ${JSON.stringify(file)}`, (err, stdout, stderr) => {
	err ? reject(err) : stderr ? reject(new Error(stderr)) : resolve(stdout);
	})
	);
	await fs.promises.unlink(file);
	return output;
	}

	/**
	* ```js
	* rb_dump(`nil`) => Uint8Array { 4, 8, 0x30 }
	* ```
	*/
	export async function rb_dump(code: string): Promise<Uint8Array> {
	const hex = await rb_eval(`s = Marshal.dump begin ${code} end; print s.unpack1 'H*'`);
	return Buffer.from(hex, "hex");
	}

	import http, { IncomingMessage, ServerResponse } from "node:http";

	http
	.createServer((req, res) => {
	res.setHeader("Access-Control-Allow-Origin", "*");

	if (req.method === "GET") {
	if (req.url === "/") return writeIndexHTML(res);
	else {
	res.statusCode = 404;
	return res.end();
	}
	}

	if (req.method === "POST") {
	if (req.url === "/rb_dump") {
	return text(req)
	.then(rb_dump)
	.then(data => {
	res.writeHead(200, { "Content-Type": "application/json" });
	res.end(JSON.stringify(data)); // {"type":"Buffer","data":[1]}
	})
	.catch(err => {
	res.writeHead(400, { "Content-Type": "text/plain" });
	res.end(err.message);
	});
	}
	}
	})
	.listen(3000, () => {
	console.log("serving http://localhost:3000");
	});

	async function text(req: IncomingMessage): Promise<string> {
	const chunks: Uint8Array[] = [];
	for await (const chunk of req) chunks.push(chunk);
	return Buffer.concat(chunks).toString("utf-8");
	}

	function writeIndexHTML(res: ServerResponse) {
	res.writeHead(200, { "Content-Type": "text/html" });
	res.end(indexHTML);
	}

	const indexHTML = `<!DOCTYPE html>
	<html lang="en"><head><meta charset="UTF-8"><title>Test</title></head><body><style>
	html { height: 100%; box-sizing: border-box }
	, :before, *:after { box-sizing: inherit }
	body { height: 100%; margin: 0; padding: 8px }
	body { display: flex; flex-direction: column; gap: 8px }
	textarea { flex: 1; tab-size: 2; font-size: 16px; padding: 8px; line-height: 1.2; white-space: pre }
	button { padding: 8px 16px; font-size: 16px }
	.row { display: flex; gap: 8px } .row>* { flex: 1 }
	input { font-size: 16px; padding: 8px; font-family: monospace }
	</style>
	<textarea id="ruby" placeholder="nil">nil</textarea><button id="dump">DUMP</button>
	<textarea id="output" placeholder="04 08 30"></textarea>
	<textarea id="output2" placeholder="04 08 T_NIL"></textarea>
	<div class="row"><input id="char" placeholder="a"><input id="char_code" placeholder="97"></div>
	<script type="module">
	var IDX=256, HEX=[]
	while (IDX--) HEX[IDX] = (IDX + 256).toString(16).slice(1)
	var CODES = {45:"B_NEGATIVE",43:"B_POSITIVE",1:"RE_IGNORECASE",4:"RE_MULTILINE",91:"T_ARRAY",108:"T_BIGNUM",99:"T_CLASS",100:"T_DATA",101:"T_EXTENDED",70:"T_FALSE",105:"T_FIXNUM",102:"T_FLOAT",123:"T_HASH",125:"T_HASH_DEF",73:"T_IVAR",64:"T_LINK",109:"T_MODULE",77:"T_MODULE_OLD",48:"T_NIL",111:"T_OBJECT",47:"T_REGEXP",34:"T_STRING",83:"T_STRUCT",58:"T_SYMBOL",59:"T_SYMLINK",84:"T_TRUE",67:"T_UCLASS",117:"T_USERDEF",85:"T_USERMARSHAL"}
	dump.onclick = async () => {
	sessionStorage.setItem('ruby', ruby.value)

	output.disabled = output2.disabled = true

	const res = await fetch('/rb_dump', { method: 'POST', body: ruby.value })
	if (!res.ok) {
	output.value = await res.text()
	output2.value = ''
	output.disabled = output2.disabled = false
	return
	}

	const {data} = await res.json()
	let formatted = '', formatted2 = ''
	for (let i = 0; i < data.length; ++i) {
	formatted += HEX[data[i]] + ' '
	formatted2 += ((i > 1 ? CODES[data[i]] : '') \|\| HEX[data[i]]) + ' '
	if (i % 16 === 15) formatted += '\\n'
	}
	output.value = formatted
	output2.value = formatted2

	output.disabled = output2.disabled = false
	}
	if (sessionStorage.getItem('ruby')) {
	ruby.value = sessionStorage.getItem('ruby')
	}
	char.oninput = () => {
	char_code.value = char.value.charCodeAt(0)
	}
	char_code.oninput = () => {
	char.value = String.fromCharCode(char_code.value)
	}
	</script></body></html>
	`;