yaml to s-expressions

flems.io

https://flems.io/#0=N4IgtglgJlA2CmIBcA2ArAOgJwA4A0IAzgMYBOA9rLMgNoCMdaATBgOxp4AMAugQGYQEhWqAB2AQzCIkIDAAsALmGoFi5UQvgbkIEAF88YydNkArYavWbtMiGAAO5UgoAEATQCCAWQAyLvhRgLgDkigr2hEgA9FHm9mAYUPAAblEAnpKwwQDcADqi+WqihK4Zyi4AvO7ePhj24qSE8AAUAAb5YORQAK4ISPkuLgC0LlKdpGlILvAAHo7OLrng8ONpS3gudAPDLlDiCuJTEADMLEUlLpwbS3LwVOQuCrek8ACES9sjfN2ixFMAPttBoNZvNXEsAOYveAKCCiCHrFwvQi9VwnJgudFA4HZbIuch8PhNVwElwlUhwiGY0SjFZONY04GDdEYc6uTjYwa4lwIeFPTmY06s9QXOhMfKtACUeQKvxFrlB8GImigAHluvZuq4qu1RM1Oj0ENt9XSJi5mqCnODlmAlpLNpLjXsDuaWWzLvabndYA8nvAXu8QI7Gc1vr9zZaFpDobD4QB9O3m5GowUY9HBpnNN3yj1M7kEokw-F8MkKCnw6m01bYrNC91i+1cvG8iH8xnByWtGX5MPKiDqFz1RrwHxw+AAUTmpGasDHGwEElg9uA23doMalR5Y4whHss4UzWCeGCkowYHE9gtlQAfNMMGW7M1JRmkTDuqQaevCGeL80LVONgge0KlvFdGWZPg-wXcRYBcAAyODMUqCoqi-DAWyeIY6Htf5-mmKcdwOZxCAAdQgJ5D1xE9lwFF4FHfT8p2xPRplgJoXDAplBjohiXFaZoABJgHXPRO2Y7ZRIwUxyDhQ8QmDPR8h7H4+wHIcmi8VFBDHSd7GnWdRHgQhAJoxl3XILVNxobhVxzBpSHENJCE3AyjJ3PdyMPXJ8hPbY+CcGciwgTdODxYKAB4XHsxzvwwuQwoAagS0ymQQVxXM3aKnJoCBuBlJkIEgjKUKqYITxcIpY26eBsTSwcGiaKBN3UkcdKnGc5yQkqotIBynPQrRWzkLCX0GCyFDqbpCDkZoWqgF9FMZHiP3xLUpJkvVgm80RghcBKQkGYIMBeex4H2LNnz281xoGvk5BcW86BcAB+EJtt2-bdqOk6zoPICXCmMqFKU0Re1hNSGvgDxesc5osuMzEUoqnNxqsmzGX8-SgpCsKXEi+HbqGxLko42qi2Knq+sIHK8uxQqOsM5DSvKyq4WqsnXDm5rIYZ+BAKu7DsRuzVptmyH5ok7ZlsZLafKu3aQmO+BTvO-79pu6TZNlnb5cOpWVb+y7Pve3XFZ+1WdieyLOBey4AaQkZBdERblN+cGaRa1UACNTCVA9yB9kzSaWt8Vu933lQwLQHyM5oA9MU9z0vZoaAkKQNmdcRuGA69sX4oS0-gFihJa5pM-5-bsNE3VBmB2Uwf7D2efLrrc04zFIOhvqMAgQgu9hzPLvb7jQ6b4d+7SMv9nEEyJNY9jCvNBQ0lO0lM6ZxYiAfeFE2H196JWlrNNgWFXN06cW6Aue7nYvfpfq4dw79qeDhM9atfehb8hd0QoHIYhuhSA0BgAA7hSTQYthzNDKEueWn98h-wAUAiaYDyItFLu3A0vR4BTBoNiYAVZ6SA0jNaMYiI6C7QMPg3Y09AbZmKOya4IBbj3EeM8N4SxKF4HwQKXsxC5hWk3lCeAMJKQJhABsZMJ9Uypm2vmQkxJiylnLFSOEhCJjbXoRcDk+RuRxU0XWHMYp3rcPAi4KhjJeDf3yPaY2PlJQSKIHcP2jdhAyE4EgTgQwcAABYkBYH0IYEAhcdCskIBYEAlVo46EUOUduXtxDEAANZQgsr-KYABiMUdBOCMHysjH0pBMl8GICUkp+SQFyDQUMXciScGDheDKPQjimgIFUsUHQxwkB0ACXobgeggA

yaml2wat.js

import YAML from 'https://jspm.dev/yaml';

const yaml = YAML.parse(`
module:
  - memory: export "memory", 1
  - data: i32.const 0, "hello there!"
  - func: |
      export "greeting", result i32 i32
      ;; offset of string in memory
      i32.const 0
      ;; length
      i32.const 12
`);

const expectedOuput = `
(module
  (memory (export "mem") 1)
  (data (i32.const 0) "hello there!")
  (func (export "greeting_") (result i32 i32)
    (i32.const 0)    ;; offset of string in memory
    (i32.const 12)   ;; length
  )
)`;

function parseLineExpr(line, final) {
  const exprs = line.split(',').map(e => e.trim())
  return exprs.map((expr, i) => {
    if((final && i === exprs.length-1) || expr.startsWith(';;')) {
      return expr
    } else {
      return `(${expr})`
    }
  }).join(' ')
}

function parseMultilineExpr(lines, i) {
  const out = []
  const arrays = lines.split('\n')
  for(let i = 0; i < arrays.length; i++) {
    let line = arrays[i];
    if(line === '') continue
    let parsed = parseLineExpr(line, i === arrays.length-1)
    out.push(parsed)
  }
  return out.join('\n' + '  '.repeat(i)) + (out.length > 1 ? '\n' + ' '.repeat(i) : '')
}

function parseArray(arrays, i) {
  const out = []
  for(let i = 0; i < arrays.length; i++) {
    let line = arrays[i];
    if(line === '') continue
    let parsed = parse(line, i + 1)
    out.push(parsed)
  }
  return  '\n' + '  '.repeat(i) + out.join('\n' + '  '.repeat(i)) + '\n' + '  '.repeat(i - 1 < 0 ? 0 : i - 1)
}

function parseObject(obj, i) {
  return Object.entries(obj).map(([name, data]) =>
    `(${name} ${parse(data, i + 1)})`
  )
}

function parse(data, i = 0) {
  if(Array.isArray(data)) {
    return parseArray(data, i)
  } else if (typeof data === "string") {
    return parseMultilineExpr(data, i)
  } else {
    return parseObject(data, i).join('\n')
  }
}

document.write(parse(yaml) + '\n')
document.write(parse({
  module: [
    { memory: 'export "mem", 1' },
    { data: 'i32.const 0, "hello there!"' },
    {
      func: 'export "greeting_", result i32 i32\n;; offset of string in memory\ni32.const 0\n;; length\ni32.const 12\n',
    },
  ],
}
) + '\n')